[v6,07/13] ARC: Linux Syscall Interface
Commit Message
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
sysdeps/unix/sysv/linux/arc/arch-syscall.h | 303 ++++++++++++++++++
sysdeps/unix/sysv/linux/arc/bits/timesize.h | 21 ++
sysdeps/unix/sysv/linux/arc/clone.S | 98 ++++++
.../unix/sysv/linux/arc/fixup-asm-unistd.h | 41 +++
sysdeps/unix/sysv/linux/arc/jmp_buf-macros.h | 6 +
sysdeps/unix/sysv/linux/arc/kernel-features.h | 28 ++
sysdeps/unix/sysv/linux/arc/kernel_stat.h | 26 ++
sysdeps/unix/sysv/linux/arc/mmap_internal.h | 27 ++
sysdeps/unix/sysv/linux/arc/pt-vfork.S | 1 +
sysdeps/unix/sysv/linux/arc/sigaction.c | 31 ++
sysdeps/unix/sysv/linux/arc/sigrestorer.S | 29 ++
sysdeps/unix/sysv/linux/arc/syscall.S | 33 ++
sysdeps/unix/sysv/linux/arc/syscalls.list | 3 +
sysdeps/unix/sysv/linux/arc/sysctl.mk | 1 +
sysdeps/unix/sysv/linux/arc/sysdep.c | 33 ++
sysdeps/unix/sysv/linux/arc/sysdep.h | 224 +++++++++++++
sysdeps/unix/sysv/linux/arc/vfork.S | 42 +++
17 files changed, 947 insertions(+)
create mode 100644 sysdeps/unix/sysv/linux/arc/arch-syscall.h
create mode 100644 sysdeps/unix/sysv/linux/arc/bits/timesize.h
create mode 100644 sysdeps/unix/sysv/linux/arc/clone.S
create mode 100644 sysdeps/unix/sysv/linux/arc/fixup-asm-unistd.h
create mode 100644 sysdeps/unix/sysv/linux/arc/jmp_buf-macros.h
create mode 100644 sysdeps/unix/sysv/linux/arc/kernel-features.h
create mode 100644 sysdeps/unix/sysv/linux/arc/kernel_stat.h
create mode 100644 sysdeps/unix/sysv/linux/arc/mmap_internal.h
create mode 100644 sysdeps/unix/sysv/linux/arc/pt-vfork.S
create mode 100644 sysdeps/unix/sysv/linux/arc/sigaction.c
create mode 100644 sysdeps/unix/sysv/linux/arc/sigrestorer.S
create mode 100644 sysdeps/unix/sysv/linux/arc/syscall.S
create mode 100644 sysdeps/unix/sysv/linux/arc/syscalls.list
create mode 100644 sysdeps/unix/sysv/linux/arc/sysctl.mk
create mode 100644 sysdeps/unix/sysv/linux/arc/sysdep.c
create mode 100644 sysdeps/unix/sysv/linux/arc/sysdep.h
create mode 100644 sysdeps/unix/sysv/linux/arc/vfork.S
Comments
On 22/04/2020 22:41, Vineet Gupta via Libc-alpha wrote:
> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
As prior patches we do not use DCO, but rather copyright assignment.
Some comments below.
> ---
> sysdeps/unix/sysv/linux/arc/arch-syscall.h | 303 ++++++++++++++++++
> sysdeps/unix/sysv/linux/arc/bits/timesize.h | 21 ++
> sysdeps/unix/sysv/linux/arc/clone.S | 98 ++++++
> .../unix/sysv/linux/arc/fixup-asm-unistd.h | 41 +++
> sysdeps/unix/sysv/linux/arc/jmp_buf-macros.h | 6 +
> sysdeps/unix/sysv/linux/arc/kernel-features.h | 28 ++
> sysdeps/unix/sysv/linux/arc/kernel_stat.h | 26 ++
> sysdeps/unix/sysv/linux/arc/mmap_internal.h | 27 ++
> sysdeps/unix/sysv/linux/arc/pt-vfork.S | 1 +
> sysdeps/unix/sysv/linux/arc/sigaction.c | 31 ++
> sysdeps/unix/sysv/linux/arc/sigrestorer.S | 29 ++
> sysdeps/unix/sysv/linux/arc/syscall.S | 33 ++
> sysdeps/unix/sysv/linux/arc/syscalls.list | 3 +
> sysdeps/unix/sysv/linux/arc/sysctl.mk | 1 +
> sysdeps/unix/sysv/linux/arc/sysdep.c | 33 ++
> sysdeps/unix/sysv/linux/arc/sysdep.h | 224 +++++++++++++
> sysdeps/unix/sysv/linux/arc/vfork.S | 42 +++
> 17 files changed, 947 insertions(+)
> create mode 100644 sysdeps/unix/sysv/linux/arc/arch-syscall.h
> create mode 100644 sysdeps/unix/sysv/linux/arc/bits/timesize.h
> create mode 100644 sysdeps/unix/sysv/linux/arc/clone.S
> create mode 100644 sysdeps/unix/sysv/linux/arc/fixup-asm-unistd.h
> create mode 100644 sysdeps/unix/sysv/linux/arc/jmp_buf-macros.h
> create mode 100644 sysdeps/unix/sysv/linux/arc/kernel-features.h
> create mode 100644 sysdeps/unix/sysv/linux/arc/kernel_stat.h
> create mode 100644 sysdeps/unix/sysv/linux/arc/mmap_internal.h
> create mode 100644 sysdeps/unix/sysv/linux/arc/pt-vfork.S
> create mode 100644 sysdeps/unix/sysv/linux/arc/sigaction.c
> create mode 100644 sysdeps/unix/sysv/linux/arc/sigrestorer.S
> create mode 100644 sysdeps/unix/sysv/linux/arc/syscall.S
> create mode 100644 sysdeps/unix/sysv/linux/arc/syscalls.list
> create mode 100644 sysdeps/unix/sysv/linux/arc/sysctl.mk
> create mode 100644 sysdeps/unix/sysv/linux/arc/sysdep.c
> create mode 100644 sysdeps/unix/sysv/linux/arc/sysdep.h
> create mode 100644 sysdeps/unix/sysv/linux/arc/vfork.S
>
> diff --git a/sysdeps/unix/sysv/linux/arc/arch-syscall.h b/sysdeps/unix/sysv/linux/arc/arch-syscall.h
> new file mode 100644
> index 000000000000..2b017eb5bbaa
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/arch-syscall.h
> @@ -0,0 +1,303 @@
> +/* AUTOGENERATED by update-syscall-lists.py. */
> +#define __NR_accept 202
> +#define __NR_accept4 242
> +#define __NR_acct 89
> +#define __NR_add_key 217
> +#define __NR_adjtimex 171
> +#define __NR_arc_gettls 246
> +#define __NR_arc_settls 245
> +#define __NR_arc_usr_cmpxchg 248
> +#define __NR_bind 200
> +#define __NR_bpf 280
> +#define __NR_brk 214
> +#define __NR_cacheflush 244
> +#define __NR_capget 90
> +#define __NR_capset 91
> +#define __NR_chdir 49
> +#define __NR_chroot 51
> +#define __NR_clock_adjtime64 405
> +#define __NR_clock_getres_time64 406
> +#define __NR_clock_gettime 113
> +#define __NR_clock_gettime64 403
> +#define __NR_clock_nanosleep 115
> +#define __NR_clock_nanosleep_time64 407
> +#define __NR_clock_settime 112
> +#define __NR_clock_settime64 404
> +#define __NR_clone 220
> +#define __NR_clone3 435
> +#define __NR_close 57
> +#define __NR_connect 203
> +#define __NR_copy_file_range 285
> +#define __NR_delete_module 106
> +#define __NR_dup 23
> +#define __NR_dup3 24
> +#define __NR_epoll_create1 20
> +#define __NR_epoll_ctl 21
> +#define __NR_epoll_pwait 22
> +#define __NR_eventfd2 19
> +#define __NR_execve 221
> +#define __NR_execveat 281
> +#define __NR_exit 93
> +#define __NR_exit_group 94
> +#define __NR_faccessat 48
> +#define __NR_fadvise64_64 223
> +#define __NR_fallocate 47
> +#define __NR_fanotify_init 262
> +#define __NR_fanotify_mark 263
> +#define __NR_fchdir 50
> +#define __NR_fchmod 52
> +#define __NR_fchmodat 53
> +#define __NR_fchown 55
> +#define __NR_fchownat 54
> +#define __NR_fcntl64 25
> +#define __NR_fdatasync 83
> +#define __NR_fgetxattr 10
> +#define __NR_finit_module 273
> +#define __NR_flistxattr 13
> +#define __NR_flock 32
> +#define __NR_fremovexattr 16
> +#define __NR_fsconfig 431
> +#define __NR_fsetxattr 7
> +#define __NR_fsmount 432
> +#define __NR_fsopen 430
> +#define __NR_fspick 433
> +#define __NR_fstatfs64 44
> +#define __NR_fsync 82
> +#define __NR_ftruncate64 46
> +#define __NR_futex_time64 422
> +#define __NR_get_mempolicy 236
> +#define __NR_get_robust_list 100
> +#define __NR_getcpu 168
> +#define __NR_getcwd 17
> +#define __NR_getdents64 61
> +#define __NR_getegid 177
> +#define __NR_geteuid 175
> +#define __NR_getgid 176
> +#define __NR_getgroups 158
> +#define __NR_getitimer 102
> +#define __NR_getpeername 205
> +#define __NR_getpgid 155
> +#define __NR_getpid 172
> +#define __NR_getppid 173
> +#define __NR_getpriority 141
> +#define __NR_getrandom 278
> +#define __NR_getresgid 150
> +#define __NR_getresuid 148
> +#define __NR_getrlimit 163
> +#define __NR_getrusage 165
> +#define __NR_getsid 156
> +#define __NR_getsockname 204
> +#define __NR_getsockopt 209
> +#define __NR_gettid 178
> +#define __NR_gettimeofday 169
> +#define __NR_getuid 174
> +#define __NR_getxattr 8
> +#define __NR_init_module 105
> +#define __NR_inotify_add_watch 27
> +#define __NR_inotify_init1 26
> +#define __NR_inotify_rm_watch 28
> +#define __NR_io_cancel 3
> +#define __NR_io_destroy 1
> +#define __NR_io_getevents 4
> +#define __NR_io_pgetevents 292
> +#define __NR_io_pgetevents_time64 416
> +#define __NR_io_setup 0
> +#define __NR_io_submit 2
> +#define __NR_io_uring_enter 426
> +#define __NR_io_uring_register 427
> +#define __NR_io_uring_setup 425
> +#define __NR_ioctl 29
> +#define __NR_ioprio_get 31
> +#define __NR_ioprio_set 30
> +#define __NR_kcmp 272
> +#define __NR_kexec_file_load 294
> +#define __NR_kexec_load 104
> +#define __NR_keyctl 219
> +#define __NR_kill 129
> +#define __NR_lgetxattr 9
> +#define __NR_linkat 37
> +#define __NR_listen 201
> +#define __NR_listxattr 11
> +#define __NR_llistxattr 12
> +#define __NR_llseek 62
> +#define __NR_lookup_dcookie 18
> +#define __NR_lremovexattr 15
> +#define __NR_lsetxattr 6
> +#define __NR_madvise 233
> +#define __NR_mbind 235
> +#define __NR_membarrier 283
> +#define __NR_memfd_create 279
> +#define __NR_migrate_pages 238
> +#define __NR_mincore 232
> +#define __NR_mkdirat 34
> +#define __NR_mknodat 33
> +#define __NR_mlock 228
> +#define __NR_mlock2 284
> +#define __NR_mlockall 230
> +#define __NR_mmap2 222
> +#define __NR_mount 40
> +#define __NR_move_mount 429
> +#define __NR_move_pages 239
> +#define __NR_mprotect 226
> +#define __NR_mq_getsetattr 185
> +#define __NR_mq_notify 184
> +#define __NR_mq_open 180
> +#define __NR_mq_timedreceive_time64 419
> +#define __NR_mq_timedsend_time64 418
> +#define __NR_mq_unlink 181
> +#define __NR_mremap 216
> +#define __NR_msgctl 187
> +#define __NR_msgget 186
> +#define __NR_msgrcv 188
> +#define __NR_msgsnd 189
> +#define __NR_msync 227
> +#define __NR_munlock 229
> +#define __NR_munlockall 231
> +#define __NR_munmap 215
> +#define __NR_name_to_handle_at 264
> +#define __NR_nanosleep 101
> +#define __NR_nfsservctl 42
> +#define __NR_open_by_handle_at 265
> +#define __NR_open_tree 428
> +#define __NR_openat 56
> +#define __NR_openat2 437
> +#define __NR_perf_event_open 241
> +#define __NR_personality 92
> +#define __NR_pidfd_getfd 438
> +#define __NR_pidfd_open 434
> +#define __NR_pidfd_send_signal 424
> +#define __NR_pipe2 59
> +#define __NR_pivot_root 41
> +#define __NR_pkey_alloc 289
> +#define __NR_pkey_free 290
> +#define __NR_pkey_mprotect 288
> +#define __NR_ppoll_time64 414
> +#define __NR_prctl 167
> +#define __NR_pread64 67
> +#define __NR_preadv 69
> +#define __NR_preadv2 286
> +#define __NR_prlimit64 261
> +#define __NR_process_vm_readv 270
> +#define __NR_process_vm_writev 271
> +#define __NR_pselect6_time64 413
> +#define __NR_ptrace 117
> +#define __NR_pwrite64 68
> +#define __NR_pwritev 70
> +#define __NR_pwritev2 287
> +#define __NR_quotactl 60
> +#define __NR_read 63
> +#define __NR_readahead 213
> +#define __NR_readlinkat 78
> +#define __NR_readv 65
> +#define __NR_reboot 142
> +#define __NR_recvfrom 207
> +#define __NR_recvmmsg_time64 417
> +#define __NR_recvmsg 212
> +#define __NR_remap_file_pages 234
> +#define __NR_removexattr 14
> +#define __NR_renameat 38
> +#define __NR_renameat2 276
> +#define __NR_request_key 218
> +#define __NR_restart_syscall 128
> +#define __NR_rseq 293
> +#define __NR_rt_sigaction 134
> +#define __NR_rt_sigpending 136
> +#define __NR_rt_sigprocmask 135
> +#define __NR_rt_sigqueueinfo 138
> +#define __NR_rt_sigreturn 139
> +#define __NR_rt_sigsuspend 133
> +#define __NR_rt_sigtimedwait_time64 421
> +#define __NR_rt_tgsigqueueinfo 240
> +#define __NR_sched_get_priority_max 125
> +#define __NR_sched_get_priority_min 126
> +#define __NR_sched_getaffinity 123
> +#define __NR_sched_getattr 275
> +#define __NR_sched_getparam 121
> +#define __NR_sched_getscheduler 120
> +#define __NR_sched_rr_get_interval_time64 423
> +#define __NR_sched_setaffinity 122
> +#define __NR_sched_setattr 274
> +#define __NR_sched_setparam 118
> +#define __NR_sched_setscheduler 119
> +#define __NR_sched_yield 124
> +#define __NR_seccomp 277
> +#define __NR_semctl 191
> +#define __NR_semget 190
> +#define __NR_semop 193
> +#define __NR_semtimedop_time64 420
> +#define __NR_sendfile64 71
> +#define __NR_sendmmsg 269
> +#define __NR_sendmsg 211
> +#define __NR_sendto 206
> +#define __NR_set_mempolicy 237
> +#define __NR_set_robust_list 99
> +#define __NR_set_tid_address 96
> +#define __NR_setdomainname 162
> +#define __NR_setfsgid 152
> +#define __NR_setfsuid 151
> +#define __NR_setgid 144
> +#define __NR_setgroups 159
> +#define __NR_sethostname 161
> +#define __NR_setitimer 103
> +#define __NR_setns 268
> +#define __NR_setpgid 154
> +#define __NR_setpriority 140
> +#define __NR_setregid 143
> +#define __NR_setresgid 149
> +#define __NR_setresuid 147
> +#define __NR_setreuid 145
> +#define __NR_setrlimit 164
> +#define __NR_setsid 157
> +#define __NR_setsockopt 208
> +#define __NR_settimeofday 170
> +#define __NR_setuid 146
> +#define __NR_setxattr 5
> +#define __NR_shmat 196
> +#define __NR_shmctl 195
> +#define __NR_shmdt 197
> +#define __NR_shmget 194
> +#define __NR_shutdown 210
> +#define __NR_sigaltstack 132
> +#define __NR_signalfd4 74
> +#define __NR_socket 198
> +#define __NR_socketpair 199
> +#define __NR_splice 76
> +#define __NR_statfs64 43
> +#define __NR_statx 291
> +#define __NR_swapoff 225
> +#define __NR_swapon 224
> +#define __NR_symlinkat 36
> +#define __NR_sync 81
> +#define __NR_sync_file_range 84
> +#define __NR_syncfs 267
> +#define __NR_sysfs 247
> +#define __NR_sysinfo 179
> +#define __NR_syslog 116
> +#define __NR_tee 77
> +#define __NR_tgkill 131
> +#define __NR_timer_create 107
> +#define __NR_timer_delete 111
> +#define __NR_timer_getoverrun 109
> +#define __NR_timer_gettime 108
> +#define __NR_timer_gettime64 408
> +#define __NR_timer_settime 110
> +#define __NR_timer_settime64 409
> +#define __NR_timerfd_create 85
> +#define __NR_timerfd_gettime64 410
> +#define __NR_timerfd_settime64 411
> +#define __NR_times 153
> +#define __NR_tkill 130
> +#define __NR_truncate64 45
> +#define __NR_umask 166
> +#define __NR_umount2 39
> +#define __NR_uname 160
> +#define __NR_unlinkat 35
> +#define __NR_unshare 97
> +#define __NR_userfaultfd 282
> +#define __NR_utimensat_time64 412
> +#define __NR_vhangup 58
> +#define __NR_vmsplice 75
> +#define __NR_wait4 260
> +#define __NR_waitid 95
> +#define __NR_write 64
> +#define __NR_writev 66
Ok, although I did not confered it was done with lastest Linux kernel
releases used by build-many-glibcs.py. You might double check it.
> diff --git a/sysdeps/unix/sysv/linux/arc/bits/timesize.h b/sysdeps/unix/sysv/linux/arc/bits/timesize.h
> new file mode 100644
> index 000000000000..1259077c6412
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/bits/timesize.h
> @@ -0,0 +1,21 @@
> +/* Bit size of the time_t type at glibc build time, general case.
> + Copyright (C) 2019-2020 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <http://www.gnu.org/licenses/>. */
> +
> +#include <bits/wordsize.h>
> +
> +#define __TIMESIZE 64
Ok.
> diff --git a/sysdeps/unix/sysv/linux/arc/clone.S b/sysdeps/unix/sysv/linux/arc/clone.S
> new file mode 100644
> index 000000000000..c5ba38541163
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/clone.S
> @@ -0,0 +1,98 @@
> +/* clone() implementation for ARC.
> + Copyright (C) 2008-2020 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> + Contributed by Andrew Jenner <andrew@codesourcery.com>, 2008.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +
> +#include <sysdep.h>
> +#define _ERRNO_H 1
> +#include <bits/errno.h>
> +#include <tcb-offsets.h>
> +
> +#define CLONE_SETTLS 0x00080000
> +
> +/* int clone(int (*fn)(void *), void *child_stack,
> + int flags, void *arg, ...
> + < pid_t *ptid, struct user_desc *tls, pid_t *ctid > );
> +
> + NOTE: I'm assuming that the last 3 args are NOT var-args and in case all
> + 3 are not relevant, caller will nevertheless pass those as NULL.
Maybe we should update our clone prototype, although this might incur
in a ABI break. The assumption here should be ok, since all other
implementations do the same.
> +
> + clone syscall in kernel (ABI: CONFIG_CLONE_BACKWARDS)
> +
> + int sys_clone(unsigned long int clone_flags,
> + unsigned long int newsp,
> + int __user *parent_tidptr,
> + void *tls,
> + int __user *child_tidptr). */
> +
> +ENTRY (__clone)
> + cmp r0, 0 ; @fn can't be NULL
> + cmp.ne r1, 0 ; @child_stack can't be NULL
> + bz .L__sys_err
> +
> + ; save some of the orig args
> + ; r0 containg @fn will be clobbered AFTER syscall (with ret val)
> + ; rest are clobbered BEFORE syscall due to different arg ordering
> + mov r10, r0 ; @fn
> + mov r11, r3 ; @args
> + mov r12, r2 ; @clone_flags
> + mov r9, r5 ; @tls
> +
> + ; adjust libc args for syscall
> +
> + mov r0, r2 ; libc @flags is 1st syscall arg
> + mov r2, r4 ; libc @ptid
> + mov r3, r5 ; libc @tls
> + mov r4, r6 ; libc @ctid
> + mov r8, __NR_clone
> + ARC_TRAP_INSN
> +
> + cmp r0, 0 ; return code : 0 new process, !0 parent
> + blt .L__sys_err2 ; < 0 (signed) error
> + jnz [blink] ; Parent returns
> +
> + ; ----- child starts here ---------
> +
> + ; Setup TP register (only recent kernels v4.19+ do that)
> + and.f 0, r12, CLONE_SETTLS
> + mov.nz r25, r9
Do you still need to set it since the minimum supported kernel
for ARC is 5.1 ?
It should be safe for internal glibc usage, since for both pthread
and posix_spawn it blocks all signals including SIGCANCEL and SIGXID.
However this is still small race window if this is called directly
with pthread cancellation or g*uid in multithread.
> +
> + ; child jumps off to @fn with @arg as argument, and returns here
> + jl.d [r10]
> + mov r0, r11
> +
> + ; exit() with result from @fn (already in r0)
> + mov r8, __NR_exit
> + ARC_TRAP_INSN
> + ; In case it ever came back
> + flag 1
> +
> +.L__sys_err:
Can't you use L(...) macro as other architectures?
> + mov r0, -EINVAL
> +.L__sys_err2:
> + ; (1) No need to make -ve kernel error code as positive errno
> + ; __syscall_error expects the -ve error code returned by kernel
> + ; (2) r0 still had orig -ve kernel error code
> + ; (3) Tail call to __syscall_error so we dont have to come back
> + ; here hence instead of jmp-n-link (reg push/pop) we do jmp
> + ; (4) No need to route __syscall_error via PLT, B is inherently
> + ; position independent
> + b __syscall_error
> +PSEUDO_END (__clone)
> +libc_hidden_def (__clone)
> +weak_alias (__clone, clone)
Ok.
> diff --git a/sysdeps/unix/sysv/linux/arc/fixup-asm-unistd.h b/sysdeps/unix/sysv/linux/arc/fixup-asm-unistd.h
> new file mode 100644
> index 000000000000..47faaecc8970
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/fixup-asm-unistd.h
> @@ -0,0 +1,41 @@
> +/* Regularize <asm/unistd.h> definitions. ARC version.
> + Copyright (C) 2020 Free Software Foundation, Inc.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <http://www.gnu.org/licenses/>. */
> +
> +/* Adjustments to ARC asm-generic syscall ABI (3.9 kernel) for 64-bit time_t
> + support. */
> +
> +/* fstat64 and fstatat64 need to be replaced with statx. */
> +
> +#undef __NR_fstat64
> +#undef __NR_fstatat64
> +
> +/* Replace all other 32-bit time syscalls with 64-bit variants. */
> +
> +# undef __NR_clock_adjtime
> +# undef __NR_clock_getres
> +# undef __NR_futex
> +# undef __NR_mq_timedreceive
> +# undef __NR_mq_timedsend
> +# undef __NR_ppoll
> +# undef __NR_pselect6
> +# undef __NR_recvmmsg
> +# undef __NR_rt_sigtimedwait
> +# undef __NR_sched_rr_get_interval
> +# undef __NR_semtimedop
> +# undef __NR_timerfd_settime
> +# undef __NR_timerfd_gettime
> +# undef __NR_utimensat
Ok.
> diff --git a/sysdeps/unix/sysv/linux/arc/jmp_buf-macros.h b/sysdeps/unix/sysv/linux/arc/jmp_buf-macros.h
> new file mode 100644
> index 000000000000..296f3197ee31
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/jmp_buf-macros.h
> @@ -0,0 +1,6 @@
> +#define JMP_BUF_SIZE (32 + 1 + 64 / (8 * sizeof (unsigned long int))) * sizeof (unsigned long int)
> +#define SIGJMP_BUF_SIZE (32 + 1 + 64 / (8 * sizeof (unsigned long int))) * sizeof (unsigned long int)
> +#define JMP_BUF_ALIGN __alignof__ (unsigned long int)
> +#define SIGJMP_BUF_ALIGN __alignof__ (unsigned long int)
> +#define MASK_WAS_SAVED_OFFSET (32 * sizeof (unsigned long int))
> +#define SAVED_MASK_OFFSET (33 * sizeof (unsigned long int))
Ok.
> diff --git a/sysdeps/unix/sysv/linux/arc/kernel-features.h b/sysdeps/unix/sysv/linux/arc/kernel-features.h
> new file mode 100644
> index 000000000000..4f23a34489eb
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/kernel-features.h
> @@ -0,0 +1,28 @@
> +/* Set flags signalling availability of kernel features based on given
> + kernel version number.
> +
> + Copyright (C) 2009-2020 Free Software Foundation, Inc.
> +
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +/* The minimum supported kernel version for ARC is 5.1 (64-bit time, offsets),
> + although the asm-generic ABI is from 3.9 (when Linux port was merged). */
> +
> +#include_next <kernel-features.h>
> +
> +#undef __ASSUME_CLONE_DEFAULT
> +#define __ASSUME_CLONE_BACKWARDS 1
Ok.
> diff --git a/sysdeps/unix/sysv/linux/arc/kernel_stat.h b/sysdeps/unix/sysv/linux/arc/kernel_stat.h
> new file mode 100644
> index 000000000000..8fdd86b9e843
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/kernel_stat.h
> @@ -0,0 +1,26 @@
> +/* Copyright (C) 2020 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <bits/wordsize.h>
> +
> +/* Needed to elide the itemized copy code in common xstatconv.c. */
> +#define STAT_IS_KERNEL_STAT 1
> +
> +/* Nice side-effect of 64-bit time_t switch is these are same. */
> +#define XSTAT_IS_XSTAT64 1
> +
> +#define STATFS_IS_STATFS64 0
Ok.
> diff --git a/sysdeps/unix/sysv/linux/arc/mmap_internal.h b/sysdeps/unix/sysv/linux/arc/mmap_internal.h
> new file mode 100644
> index 000000000000..19aa078dd45e
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/mmap_internal.h
> @@ -0,0 +1,27 @@
> +/* mmap - map files or devices into memory. Linux/ARC version.
> + Copyright (C) 2017-2020 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#ifndef MMAP_ARC_INTERNAL_H
> +#define MMAP_ARC_INTERNAL_H
> +
> +/* 8K is default but determine the shift dynamically with getpagesize. */
> +#define MMAP2_PAGE_UNIT -1
> +
> +#include_next <mmap_internal.h>
> +
> +#endif
Ok. I would be interesting if kernel could consolidate de mmap
implementation to return EINVAL for invalid offsets. A lot of
architectures have its own implementation to handle.
> diff --git a/sysdeps/unix/sysv/linux/arc/pt-vfork.S b/sysdeps/unix/sysv/linux/arc/pt-vfork.S
> new file mode 100644
> index 000000000000..1cc893170070
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/pt-vfork.S
> @@ -0,0 +1 @@
> +/* Not needed. */
This file is not required since "nptl: Remove vfork IFUNC-based
forwarder from libpthread [BZ #20188]" (41d6f74e6cb6a9).
> diff --git a/sysdeps/unix/sysv/linux/arc/sigaction.c b/sysdeps/unix/sysv/linux/arc/sigaction.c
> new file mode 100644
> index 000000000000..2613eb883fb1
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/sigaction.c
> @@ -0,0 +1,31 @@
> +/* ARC specific sigaction.
> + Copyright (C) 1997-2020 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#define SA_RESTORER 0x04000000
> +
> +extern void __default_rt_sa_restorer (void);
> +
> +#define SET_SA_RESTORER(kact, act) \
> + ({ \
> + (kact)->sa_restorer = __default_rt_sa_restorer; \
> + (kact)->sa_flags |= SA_RESTORER; \
> + })
> +
> +#define RESET_SA_RESTORER(act, kact)
> +
> +#include <sysdeps/unix/sysv/linux/sigaction.c>
Ok.
> diff --git a/sysdeps/unix/sysv/linux/arc/sigrestorer.S b/sysdeps/unix/sysv/linux/arc/sigrestorer.S
> new file mode 100644
> index 000000000000..cc3c1a0d09ff
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/sigrestorer.S
> @@ -0,0 +1,29 @@
> +/* Default sigreturn stub for ARC Linux.
> + Copyright (C) 2005-2020 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <sys/syscall.h>
> +#include <sysdep.h>
> +#include <tcb-offsets.h>
> +
> +/* Note the NOP has to be outside body. */
> + nop
Wy exactly do you need it here?
> +ENTRY (__default_rt_sa_restorer)
> + mov r8, __NR_rt_sigreturn
> + ARC_TRAP_INSN
> + j_s [blink]
Ok.
> +PSEUDO_END_NOERRNO (__default_rt_sa_restorer)
> diff --git a/sysdeps/unix/sysv/linux/arc/syscall.S b/sysdeps/unix/sysv/linux/arc/syscall.S
> new file mode 100644
> index 000000000000..ff17e71575b1
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/syscall.S
> @@ -0,0 +1,33 @@
> +/* syscall - indirect system call.
> + Copyright (C) 2017-2020 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <sysdep.h>
> +
> +ENTRY (syscall)
> + mov_s r8, r0
> + mov_s r0, r1
> + mov_s r1, r2
> + mov_s r2, r3
> + mov_s r3, r4
> + mov_s r4, r5
> + mov_s r5, r6
> +
> + ARC_TRAP_INSN
> + brhi r0, -1024, .Lcall_syscall_err
> + j [blink]
> +PSEUDO_END (syscall)
Ok.
> diff --git a/sysdeps/unix/sysv/linux/arc/syscalls.list b/sysdeps/unix/sysv/linux/arc/syscalls.list
> new file mode 100644
> index 000000000000..d0ef5977ee06
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/syscalls.list
> @@ -0,0 +1,3 @@
> +# File name Caller Syscall name Args Strong name Weak names
> +
> +cacheflush - cacheflush i:pii _flush_cache cacheflush
Ok.
> diff --git a/sysdeps/unix/sysv/linux/arc/sysctl.mk b/sysdeps/unix/sysv/linux/arc/sysctl.mk
> new file mode 100644
> index 000000000000..05a4e2f8c99b
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/sysctl.mk
> @@ -0,0 +1 @@
> +# ARC doesn't support sysctl.
This file is not required since "Linux: Remove <sys/sysctl.h>
and the sysctl function" (076f09afbac1a).
> diff --git a/sysdeps/unix/sysv/linux/arc/sysdep.c b/sysdeps/unix/sysv/linux/arc/sysdep.c
> new file mode 100644
> index 000000000000..42c8575ba461
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/sysdep.c
> @@ -0,0 +1,33 @@
> +/* ARC wrapper for setting errno.
> + Copyright (C) 1997-2020 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <sysdep.h>
> +#include <errno.h>
> +
> +/* All syscall handlers land here to avoid generated code bloat due to
> + GOT reference to errno_location or it's equivalent. */
> +int
> +__syscall_error (int err_no)
> +{
> + __set_errno (-err_no);
> + return -1;
> +}
> +
> +#if IS_IN (libc)
> +hidden_def (__syscall_error)
> +#endif
Ok.
> diff --git a/sysdeps/unix/sysv/linux/arc/sysdep.h b/sysdeps/unix/sysv/linux/arc/sysdep.h
> new file mode 100644
> index 000000000000..3aee9b95326f
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/sysdep.h
> @@ -0,0 +1,224 @@
> +/* Assembler macros for ARC.
> + Copyright (C) 2000-2020 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#ifndef _LINUX_ARC_SYSDEP_H
> +#define _LINUX_ARC_SYSDEP_H 1
> +
> +#include <sysdeps/arc/sysdep.h>
> +#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
> +
> +/* 32-bit time syscalls are not available, but the redefines allow generic
> + wrappers to work. */
> +#define __NR_clock_adjtime __NR_clock_adjtime64
> +#define __NR_clock_getres __NR_clock_getres_time64
> +#define __NR_futex __NR_futex_time64
> +#define __NR_mq_timedreceive __NR_mq_timedreceive_time64
> +#define __NR_mq_timedsend __NR_mq_timedsend_time64
> +#define __NR_ppoll __NR_ppoll_time64
> +#define __NR_pselect6 __NR_pselect6_time64
> +#define __NR_recvmmsg __NR_recvmmsg_time64
> +#define __NR_rt_sigtimedwait __NR_rt_sigtimedwait_time64
> +#define __NR_sched_rr_get_interval __NR_sched_rr_get_interval_time64
> +#define __NR_semtimedop __NR_semtimedop_time64
> +#define __NR_timerfd_gettime __NR_timerfd_gettime64
> +#define __NR_timerfd_settime __NR_timerfd_settime64
> +#define __NR_utimensat __NR_utimensat_time64
> +
> +/* For RTLD_PRIVATE_ERRNO. */
> +#include <dl-sysdep.h>
> +
> +#include <tls.h>
> +
> +#undef SYS_ify
> +#define SYS_ify(syscall_name) __NR_##syscall_name
> +
> +#ifdef __ASSEMBLER__
> +
> +/* This is a "normal" system call stub: if there is an error,
> + it returns -1 and sets errno. */
> +
> +# undef PSEUDO
> +# define PSEUDO(name, syscall_name, args) \
> + PSEUDO_NOERRNO(name, syscall_name, args) ASM_LINE_SEP \
> + brhi r0, -4096, .Lcall_syscall_err ASM_LINE_SEP
> +
> +# define ret j_s [blink]
> +
> +# undef PSEUDO_END
> +# define PSEUDO_END(name) \
> + SYSCALL_ERROR_HANDLER ASM_LINE_SEP \
> + END (name)
> +
> +/* --------- Helper for SYSCALL_NOERRNO -----------
> + This kind of system call stub never returns an error.
> + We return the return value register to the caller unexamined. */
> +
> +# undef PSEUDO_NOERRNO
> +# define PSEUDO_NOERRNO(name, syscall_name, args) \
> + .text ASM_LINE_SEP \
> + ENTRY (name) ASM_LINE_SEP \
> + DO_CALL (syscall_name, args) ASM_LINE_SEP \
> +
> +/* Return the return value register unexamined. Since r0 is both
> + syscall return reg and function return reg, no work needed. */
> +# define ret_NOERRNO \
> + j_s [blink] ASM_LINE_SEP
> +
> +# undef PSEUDO_END_NOERRNO
> +# define PSEUDO_END_NOERRNO(name) \
> + END (name)
> +
> +/* --------- Helper for SYSCALL_ERRVAL -----------
> + This kind of system call stub returns the errno code as its return
> + value, or zero for success. We may massage the kernel's return value
> + to meet that ABI, but we never set errno here. */
> +
> +# undef PSEUDO_ERRVAL
> +# define PSEUDO_ERRVAL(name, syscall_name, args) \
> + PSEUDO_NOERRNO(name, syscall_name, args) ASM_LINE_SEP
> +
> +/* Don't set errno, return kernel error (in errno form) or zero. */
> +# define ret_ERRVAL \
> + rsub r0, r0, 0 ASM_LINE_SEP \
> + ret_NOERRNO
> +
> +# undef PSEUDO_END_ERRVAL
> +# define PSEUDO_END_ERRVAL(name) \
> + END (name)
> +
> +
> +/* To reduce the code footprint, we confine the actual errno access
> + to single place in __syscall_error().
> + This takes raw kernel error value, sets errno and returns -1. */
> +# if IS_IN (libc)
> +# define CALL_ERRNO_SETTER_C bl PLTJMP(HIDDEN_JUMPTARGET(__syscall_error))
> +# else
> +# define CALL_ERRNO_SETTER_C bl PLTJMP(__syscall_error)
> +# endif
> +
> +# define SYSCALL_ERROR_HANDLER \
> +.Lcall_syscall_err: ASM_LINE_SEP \
> + push_s blink ASM_LINE_SEP \
> + cfi_adjust_cfa_offset (4) ASM_LINE_SEP \
> + cfi_rel_offset (blink, 0) ASM_LINE_SEP \
> + CALL_ERRNO_SETTER_C ASM_LINE_SEP \
> + pop_s blink ASM_LINE_SEP \
> + cfi_adjust_cfa_offset (-4) ASM_LINE_SEP \
> + cfi_restore (blink) ASM_LINE_SEP \
> + j_s [blink]
> +
> +# define DO_CALL(syscall_name, args) \
> + mov r8, SYS_ify (syscall_name) ASM_LINE_SEP \
> + ARC_TRAP_INSN ASM_LINE_SEP
> +
> +# define ARC_TRAP_INSN trap_s 0
> +
> +#else /* !__ASSEMBLER__ */
> +
> +# define SINGLE_THREAD_BY_GLOBAL 1
> +
> +# if IS_IN (libc)
> +extern int __syscall_error (int);
> +hidden_proto (__syscall_error)
> +# endif
> +
> +# define ARC_TRAP_INSN "trap_s 0 \n\t"
> +
> +# undef INTERNAL_SYSCALL_NCS
> +# define INTERNAL_SYSCALL_NCS(number, nr_args, args...) \
> + ({ \
> + /* Per ABI, r0 is 1st arg and return reg. */ \
> + register int __ret __asm__("r0"); \
> + register int _sys_num __asm__("r8"); \
> + \
> + LOAD_ARGS_##nr_args (number, args) \
> + \
> + __asm__ volatile ( \
> + ARC_TRAP_INSN \
> + : "+r" (__ret) \
> + : "r"(_sys_num) ASM_ARGS_##nr_args \
> + : "memory"); \
> + \
> + __ret; })
> +
> +# undef INTERNAL_SYSCALL
> +# define INTERNAL_SYSCALL(name, nr, args...) \
> + INTERNAL_SYSCALL_NCS(SYS_ify(name), nr, args)
> +
> +/* Macros for setting up inline __asm__ input regs. */
> +# define ASM_ARGS_0
> +# define ASM_ARGS_1 ASM_ARGS_0, "r" (__ret)
> +# define ASM_ARGS_2 ASM_ARGS_1, "r" (_arg2)
> +# define ASM_ARGS_3 ASM_ARGS_2, "r" (_arg3)
> +# define ASM_ARGS_4 ASM_ARGS_3, "r" (_arg4)
> +# define ASM_ARGS_5 ASM_ARGS_4, "r" (_arg5)
> +# define ASM_ARGS_6 ASM_ARGS_5, "r" (_arg6)
> +# define ASM_ARGS_7 ASM_ARGS_6, "r" (_arg7)
> +
> +/* Macros for converting sys-call wrapper args into sys call args. */
> +# define LOAD_ARGS_0(nm, arg) \
> + _sys_num = (int) (nm);
> +
> +# define LOAD_ARGS_1(nm, arg1) \
> + __ret = (int) (arg1); \
> + LOAD_ARGS_0 (nm, arg1)
> +
> +/* Note that the use of _tmpX might look superflous, however it is needed
> + to ensure that register variables are not clobbered if arg happens to be
> + a function call itself. e.g. sched_setaffinity() calling getpid() for arg2
> + Also this specific order of recursive calling is important to segregate
> + the tmp args evaluation (function call case described above) and assigment
> + of register variables. */
> +
> +# define LOAD_ARGS_2(nm, arg1, arg2) \
> + int _tmp2 = (int) (arg2); \
> + LOAD_ARGS_1 (nm, arg1) \
> + register int _arg2 __asm__ ("r1") = _tmp2;
> +
> +# define LOAD_ARGS_3(nm, arg1, arg2, arg3) \
> + int _tmp3 = (int) (arg3); \
> + LOAD_ARGS_2 (nm, arg1, arg2) \
> + register int _arg3 __asm__ ("r2") = _tmp3;
> +
> +#define LOAD_ARGS_4(nm, arg1, arg2, arg3, arg4) \
> + int _tmp4 = (int) (arg4); \
> + LOAD_ARGS_3 (nm, arg1, arg2, arg3) \
> + register int _arg4 __asm__ ("r3") = _tmp4;
> +
> +# define LOAD_ARGS_5(nm, arg1, arg2, arg3, arg4, arg5) \
> + int _tmp5 = (int) (arg5); \
> + LOAD_ARGS_4 (nm, arg1, arg2, arg3, arg4) \
> + register int _arg5 __asm__ ("r4") = _tmp5;
> +
> +# define LOAD_ARGS_6(nm, arg1, arg2, arg3, arg4, arg5, arg6)\
> + int _tmp6 = (int) (arg6); \
> + LOAD_ARGS_5 (nm, arg1, arg2, arg3, arg4, arg5) \
> + register int _arg6 __asm__ ("r5") = _tmp6;
> +
> +# define LOAD_ARGS_7(nm, arg1, arg2, arg3, arg4, arg5, arg6, arg7)\
> + int _tmp7 = (int) (arg7); \
> + LOAD_ARGS_6 (nm, arg1, arg2, arg3, arg4, arg5, arg6) \
> + register int _arg7 __asm__ ("r6") = _tmp7;
> +
> +/* Pointer mangling not yet supported. */
> +# define PTR_MANGLE(var) (void) (var)
> +# define PTR_DEMANGLE(var) (void) (var)
> +
> +#endif /* !__ASSEMBLER__ */
> +
> +#endif /* linux/arc/sysdep.h */
Ok.
> diff --git a/sysdeps/unix/sysv/linux/arc/vfork.S b/sysdeps/unix/sysv/linux/arc/vfork.S
> new file mode 100644
> index 000000000000..ac1cce5258e0
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/arc/vfork.S
> @@ -0,0 +1,42 @@
> +/* vfork for ARC Linux.
> + Copyright (C) 2005-2020 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <sys/syscall.h>
> +#include <sysdep.h>
> +#include <tcb-offsets.h>
> +#define _SIGNAL_H
> +#include <bits/signum.h> /* For SIGCHLD */
> +
> +#define CLONE_VM 0x00000100
> +#define CLONE_VFORK 0x00004000
> +#define CLONE_FLAGS_FOR_VFORK (CLONE_VM|CLONE_VFORK|SIGCHLD)
> +
> +ENTRY (__vfork)
> + mov r0, CLONE_FLAGS_FOR_VFORK
> + mov_s r1, sp
> + mov r8, __NR_clone
> + ARC_TRAP_INSN
> +
> + cmp r0, 0
> + jge [blink] ; child continues
> +
> + b __syscall_error
> +PSEUDO_END (__vfork)
> +libc_hidden_def (__vfork)
> +
> +weak_alias (__vfork, vfork)
>
Ok. As a side note I think we should start to think about deprecate
vfork.
On 5/29/20 9:49 AM, Adhemerval Zanella via Libc-alpha wrote:
>
>
> On 22/04/2020 22:41, Vineet Gupta via Libc-alpha wrote:
>> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
>
> As prior patches we do not use DCO, but rather copyright assignment.
>
>> diff --git a/sysdeps/unix/sysv/linux/arc/arch-syscall.h b/sysdeps/unix/sysv/linux/arc/arch-syscall.h
>> new file mode 100644
>> index 000000000000..2b017eb5bbaa
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/arc/arch-syscall.h
>> @@ -0,0 +1,303 @@
>> +/* AUTOGENERATED by update-syscall-lists.py. */
>> +#define __NR_accept 202
>> +#define __NR_accept4 242
>> +#define __NR_acct 89
>> +#define __NR_add_key 217
>> +#define __NR_vmsplice 75
>> +#define __NR_wait4 260
>> +#define __NR_waitid 95
>> +#define __NR_write 64
>> +#define __NR_writev 66
>
> Ok, although I did not confered it was done with lastest Linux kernel
> releases used by build-many-glibcs.py. You might double check it.
I did use 5.6 kernel at the time, will double check though. Thx.
>> diff --git a/sysdeps/unix/sysv/linux/arc/clone.S b/sysdeps/unix/sysv/linux/arc/clone.S
>> +
>> +/* int clone(int (*fn)(void *), void *child_stack,
>> + int flags, void *arg, ...
>> + < pid_t *ptid, struct user_desc *tls, pid_t *ctid > );
>> +
>> + NOTE: I'm assuming that the last 3 args are NOT var-args and in case all
>> + 3 are not relevant, caller will nevertheless pass those as NULL.
>
> Maybe we should update our clone prototype, although this might incur
> in a ABI break. The assumption here should be ok, since all other
> implementations do the same.
>
>> +
>> + clone syscall in kernel (ABI: CONFIG_CLONE_BACKWARDS)
>> +
>> + int sys_clone(unsigned long int clone_flags,
>> + unsigned long int newsp,
>> + int __user *parent_tidptr,
>> + void *tls,
>> + int __user *child_tidptr). */
>> +
>> +ENTRY (__clone)
>> + cmp r0, 0 ; @fn can't be NULL
>> + cmp.ne r1, 0 ; @child_stack can't be NULL
>> + bz .L__sys_err
>> +
>> + ; save some of the orig args
>> + ; r0 containg @fn will be clobbered AFTER syscall (with ret val)
>> + ; rest are clobbered BEFORE syscall due to different arg ordering
>> + mov r10, r0 ; @fn
>> + mov r11, r3 ; @args
>> + mov r12, r2 ; @clone_flags
>> + mov r9, r5 ; @tls
>> +
>> + ; adjust libc args for syscall
>> +
>> + mov r0, r2 ; libc @flags is 1st syscall arg
>> + mov r2, r4 ; libc @ptid
>> + mov r3, r5 ; libc @tls
>> + mov r4, r6 ; libc @ctid
>> + mov r8, __NR_clone
>> + ARC_TRAP_INSN
>> +
>> + cmp r0, 0 ; return code : 0 new process, !0 parent
>> + blt .L__sys_err2 ; < 0 (signed) error
>> + jnz [blink] ; Parent returns
>> +
>> + ; ----- child starts here ---------
>> +
>> + ; Setup TP register (only recent kernels v4.19+ do that)
>> + and.f 0, r12, CLONE_SETTLS
>> + mov.nz r25, r9
>
> Do you still need to set it since the minimum supported kernel
> for ARC is 5.1 ?
Right we can drop this.
> It should be safe for internal glibc usage, since for both pthread
> and posix_spawn it blocks all signals including SIGCANCEL and SIGXID.
> However this is still small race window if this is called directly
> with pthread cancellation or g*uid in multithread.
>
>> +
>> + ; child jumps off to @fn with @arg as argument, and returns here
>> + jl.d [r10]
>> + mov r0, r11
>> +
>> + ; exit() with result from @fn (already in r0)
>> + mov r8, __NR_exit
>> + ARC_TRAP_INSN
>> + ; In case it ever came back
>> + flag 1
>> +
>> +.L__sys_err:
>
> Can't you use L(...) macro as other architectures?
OK will do.
>
>> diff --git a/sysdeps/unix/sysv/linux/arc/mmap_internal.h b/sysdeps/unix/sysv/linux/arc/mmap_internal.h
>> new file mode 100644
>> index 000000000000..19aa078dd45e
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/arc/mmap_internal.h
>> @@ -0,0 +1,27 @@
>> +/* mmap - map files or devices into memory. Linux/ARC version.
>> + Copyright (C) 2017-2020 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library; if not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef MMAP_ARC_INTERNAL_H
>> +#define MMAP_ARC_INTERNAL_H
>> +
>> +/* 8K is default but determine the shift dynamically with getpagesize. */
>> +#define MMAP2_PAGE_UNIT -1
>> +
>> +#include_next <mmap_internal.h>
>> +
>> +#endif
>
> Ok. I would be interesting if kernel could consolidate de mmap
> implementation to return EINVAL for invalid offsets. A lot of
> architectures have its own implementation to handle.
>> diff --git a/sysdeps/unix/sysv/linux/arc/pt-vfork.S b/sysdeps/unix/sysv/linux/arc/pt-vfork.S
>> new file mode 100644
>> index 000000000000..1cc893170070
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/arc/pt-vfork.S
>> @@ -0,0 +1 @@
>> +/* Not needed. */
>
> This file is not required since "nptl: Remove vfork IFUNC-based
> forwarder from libpthread [BZ #20188]" (41d6f74e6cb6a9).
Removed.
>> diff --git a/sysdeps/unix/sysv/linux/arc/sigrestorer.S b/sysdeps/unix/sysv/linux/arc/sigrestorer.S
>> +
>> +#include <sys/syscall.h>
>> +#include <sysdep.h>
>> +#include <tcb-offsets.h>
>> +
>> +/* Note the NOP has to be outside body. */
>> + nop
>
> Wy exactly do you need it here?
It has to do with how ARC gdb recognized sigrestorer. This acts a special marker
used in conjunction with the syscall id. This goes back to days when cfi pseudo
ops were not suppported in toolchain, but the gdb code lingered.
>
>> +ENTRY (__default_rt_sa_restorer)
>> + mov r8, __NR_rt_sigreturn
>> + ARC_TRAP_INSN
>> + j_s [blink]
>
> Ok.
>> diff --git a/sysdeps/unix/sysv/linux/arc/sysctl.mk b/sysdeps/unix/sysv/linux/arc/sysctl.mk
>> new file mode 100644
>> index 000000000000..05a4e2f8c99b
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/arc/sysctl.mk
>> @@ -0,0 +1 @@
>> +# ARC doesn't support sysctl.
>
> This file is not required since "Linux: Remove <sys/sysctl.h>
> and the sysctl function" (076f09afbac1a).
Removed.
On 5/29/20 9:49 AM, Adhemerval Zanella via Libc-alpha wrote:
>> + ; ----- child starts here ---------
>> +
>> + ; Setup TP register (only recent kernels v4.19+ do that)
>> + and.f 0, r12, CLONE_SETTLS
>> + mov.nz r25, r9
> Do you still need to set it since the minimum supported kernel
> for ARC is 5.1 ?
Right.
> It should be safe for internal glibc usage, since for both pthread
> and posix_spawn it blocks all signals including SIGCANCEL and SIGXID.
> However this is still small race window if this is called directly
> with pthread cancellation or g*uid in multithread.
I'm not sure what you mean above. Do you mean not doing this in glibc and even if
kernel support didn't exist should be safe internally ?
fwiw as mentioned above kernel sets up TP for clone (SETTLS). I detested doing
that for a long time, give ABI implications but ended up doing it anyways due to
an actual race hit when running uClibc tst-kill6 [1]
[1] http://lists.infradead.org/pipermail/linux-snps-arc/2018-October/004480.html
On 03/06/2020 16:46, Vineet Gupta wrote:
> On 5/29/20 9:49 AM, Adhemerval Zanella via Libc-alpha wrote:
>>> + ; ----- child starts here ---------
>>> +
>>> + ; Setup TP register (only recent kernels v4.19+ do that)
>>> + and.f 0, r12, CLONE_SETTLS
>>> + mov.nz r25, r9
>> Do you still need to set it since the minimum supported kernel
>> for ARC is 5.1 ?
>
> Right.
>
>> It should be safe for internal glibc usage, since for both pthread
>> and posix_spawn it blocks all signals including SIGCANCEL and SIGXID.
>> However this is still small race window if this is called directly
>> with pthread cancellation or g*uid in multithread.
>
> I'm not sure what you mean above. Do you mean not doing this in glibc and even if
> kernel support didn't exist should be safe internally ?
At least for internal clone usage with CLONE_VM within glibc we explicit
disable all signals (posix_spawn and pthread_create).
>
> fwiw as mentioned above kernel sets up TP for clone (SETTLS). I detested doing
> that for a long time, give ABI implications but ended up doing it anyways due to
> an actual race hit when running uClibc tst-kill6 [1]
We explicit disable all signals during the create_thread call in pthread_create
(b3cae39dcbfa2432b3f3aa28854d8ac57f0de1b8), so it should not happen on glibc
anymore. However it is still an issue if application calls clone itself.
>
> [1] http://lists.infradead.org/pipermail/linux-snps-arc/2018-October/004480.html
>
On 6/3/20 1:04 PM, Adhemerval Zanella via Libc-alpha wrote:
>
>
> On 03/06/2020 16:46, Vineet Gupta wrote:
>> On 5/29/20 9:49 AM, Adhemerval Zanella via Libc-alpha wrote:
>>>> + ; ----- child starts here ---------
>>>> +
>>>> + ; Setup TP register (only recent kernels v4.19+ do that)
>>>> + and.f 0, r12, CLONE_SETTLS
>>>> + mov.nz r25, r9
>>> Do you still need to set it since the minimum supported kernel
>>> for ARC is 5.1 ?
>>
>> Right.
>>
>>> It should be safe for internal glibc usage, since for both pthread
>>> and posix_spawn it blocks all signals including SIGCANCEL and SIGXID.
>>> However this is still small race window if this is called directly
>>> with pthread cancellation or g*uid in multithread.
>>
>> I'm not sure what you mean above. Do you mean not doing this in glibc and even if
>> kernel support didn't exist should be safe internally ?
>
> At least for internal clone usage with CLONE_VM within glibc we explicit
> disable all signals (posix_spawn and pthread_create).
>
>>
>> fwiw as mentioned above kernel sets up TP for clone (SETTLS). I detested doing
>> that for a long time, give ABI implications but ended up doing it anyways due to
>> an actual race hit when running uClibc tst-kill6 [1]
>
> We explicit disable all signals during the create_thread call in pthread_create
> (b3cae39dcbfa2432b3f3aa28854d8ac57f0de1b8), so it should not happen on glibc
> anymore. However it is still an issue if application calls clone itself.
The scenario there was pthread_create() and parent getting scheduled before child
and immediately doing pthread_kill() causing child signal handler to be invoked
and signal handler doing pthread_self() which was broken as TP was not setup.
With commit above, parent pthread_kill() will block and will only run when child
is scheduled and unblocks the signals !
On 03/06/2020 17:17, Vineet Gupta wrote:
> On 6/3/20 1:04 PM, Adhemerval Zanella via Libc-alpha wrote:
>>
>>
>> On 03/06/2020 16:46, Vineet Gupta wrote:
>>> On 5/29/20 9:49 AM, Adhemerval Zanella via Libc-alpha wrote:
>>>>> + ; ----- child starts here ---------
>>>>> +
>>>>> + ; Setup TP register (only recent kernels v4.19+ do that)
>>>>> + and.f 0, r12, CLONE_SETTLS
>>>>> + mov.nz r25, r9
>>>> Do you still need to set it since the minimum supported kernel
>>>> for ARC is 5.1 ?
>>>
>>> Right.
>>>
>>>> It should be safe for internal glibc usage, since for both pthread
>>>> and posix_spawn it blocks all signals including SIGCANCEL and SIGXID.
>>>> However this is still small race window if this is called directly
>>>> with pthread cancellation or g*uid in multithread.
>>>
>>> I'm not sure what you mean above. Do you mean not doing this in glibc and even if
>>> kernel support didn't exist should be safe internally ?
>>
>> At least for internal clone usage with CLONE_VM within glibc we explicit
>> disable all signals (posix_spawn and pthread_create).
>>
>>>
>>> fwiw as mentioned above kernel sets up TP for clone (SETTLS). I detested doing
>>> that for a long time, give ABI implications but ended up doing it anyways due to
>>> an actual race hit when running uClibc tst-kill6 [1]
>>
>> We explicit disable all signals during the create_thread call in pthread_create
>> (b3cae39dcbfa2432b3f3aa28854d8ac57f0de1b8), so it should not happen on glibc
>> anymore. However it is still an issue if application calls clone itself.
>
> The scenario there was pthread_create() and parent getting scheduled before child
> and immediately doing pthread_kill() causing child signal handler to be invoked
> and signal handler doing pthread_self() which was broken as TP was not setup.
>
> With commit above, parent pthread_kill() will block and will only run when child
> is scheduled and unblocks the signals !
It could happen with other scenarios when signal plus tp accesses were involved as
well: pthread_cancel the thread (since the sigcancel_handler acesses the tp
with THREAD_GETMEM macro), setg* functions (since sighandler_setxid), or any
functions with a syscall failure that sets the errno.
new file mode 100644
@@ -0,0 +1,303 @@
+/* AUTOGENERATED by update-syscall-lists.py. */
+#define __NR_accept 202
+#define __NR_accept4 242
+#define __NR_acct 89
+#define __NR_add_key 217
+#define __NR_adjtimex 171
+#define __NR_arc_gettls 246
+#define __NR_arc_settls 245
+#define __NR_arc_usr_cmpxchg 248
+#define __NR_bind 200
+#define __NR_bpf 280
+#define __NR_brk 214
+#define __NR_cacheflush 244
+#define __NR_capget 90
+#define __NR_capset 91
+#define __NR_chdir 49
+#define __NR_chroot 51
+#define __NR_clock_adjtime64 405
+#define __NR_clock_getres_time64 406
+#define __NR_clock_gettime 113
+#define __NR_clock_gettime64 403
+#define __NR_clock_nanosleep 115
+#define __NR_clock_nanosleep_time64 407
+#define __NR_clock_settime 112
+#define __NR_clock_settime64 404
+#define __NR_clone 220
+#define __NR_clone3 435
+#define __NR_close 57
+#define __NR_connect 203
+#define __NR_copy_file_range 285
+#define __NR_delete_module 106
+#define __NR_dup 23
+#define __NR_dup3 24
+#define __NR_epoll_create1 20
+#define __NR_epoll_ctl 21
+#define __NR_epoll_pwait 22
+#define __NR_eventfd2 19
+#define __NR_execve 221
+#define __NR_execveat 281
+#define __NR_exit 93
+#define __NR_exit_group 94
+#define __NR_faccessat 48
+#define __NR_fadvise64_64 223
+#define __NR_fallocate 47
+#define __NR_fanotify_init 262
+#define __NR_fanotify_mark 263
+#define __NR_fchdir 50
+#define __NR_fchmod 52
+#define __NR_fchmodat 53
+#define __NR_fchown 55
+#define __NR_fchownat 54
+#define __NR_fcntl64 25
+#define __NR_fdatasync 83
+#define __NR_fgetxattr 10
+#define __NR_finit_module 273
+#define __NR_flistxattr 13
+#define __NR_flock 32
+#define __NR_fremovexattr 16
+#define __NR_fsconfig 431
+#define __NR_fsetxattr 7
+#define __NR_fsmount 432
+#define __NR_fsopen 430
+#define __NR_fspick 433
+#define __NR_fstatfs64 44
+#define __NR_fsync 82
+#define __NR_ftruncate64 46
+#define __NR_futex_time64 422
+#define __NR_get_mempolicy 236
+#define __NR_get_robust_list 100
+#define __NR_getcpu 168
+#define __NR_getcwd 17
+#define __NR_getdents64 61
+#define __NR_getegid 177
+#define __NR_geteuid 175
+#define __NR_getgid 176
+#define __NR_getgroups 158
+#define __NR_getitimer 102
+#define __NR_getpeername 205
+#define __NR_getpgid 155
+#define __NR_getpid 172
+#define __NR_getppid 173
+#define __NR_getpriority 141
+#define __NR_getrandom 278
+#define __NR_getresgid 150
+#define __NR_getresuid 148
+#define __NR_getrlimit 163
+#define __NR_getrusage 165
+#define __NR_getsid 156
+#define __NR_getsockname 204
+#define __NR_getsockopt 209
+#define __NR_gettid 178
+#define __NR_gettimeofday 169
+#define __NR_getuid 174
+#define __NR_getxattr 8
+#define __NR_init_module 105
+#define __NR_inotify_add_watch 27
+#define __NR_inotify_init1 26
+#define __NR_inotify_rm_watch 28
+#define __NR_io_cancel 3
+#define __NR_io_destroy 1
+#define __NR_io_getevents 4
+#define __NR_io_pgetevents 292
+#define __NR_io_pgetevents_time64 416
+#define __NR_io_setup 0
+#define __NR_io_submit 2
+#define __NR_io_uring_enter 426
+#define __NR_io_uring_register 427
+#define __NR_io_uring_setup 425
+#define __NR_ioctl 29
+#define __NR_ioprio_get 31
+#define __NR_ioprio_set 30
+#define __NR_kcmp 272
+#define __NR_kexec_file_load 294
+#define __NR_kexec_load 104
+#define __NR_keyctl 219
+#define __NR_kill 129
+#define __NR_lgetxattr 9
+#define __NR_linkat 37
+#define __NR_listen 201
+#define __NR_listxattr 11
+#define __NR_llistxattr 12
+#define __NR_llseek 62
+#define __NR_lookup_dcookie 18
+#define __NR_lremovexattr 15
+#define __NR_lsetxattr 6
+#define __NR_madvise 233
+#define __NR_mbind 235
+#define __NR_membarrier 283
+#define __NR_memfd_create 279
+#define __NR_migrate_pages 238
+#define __NR_mincore 232
+#define __NR_mkdirat 34
+#define __NR_mknodat 33
+#define __NR_mlock 228
+#define __NR_mlock2 284
+#define __NR_mlockall 230
+#define __NR_mmap2 222
+#define __NR_mount 40
+#define __NR_move_mount 429
+#define __NR_move_pages 239
+#define __NR_mprotect 226
+#define __NR_mq_getsetattr 185
+#define __NR_mq_notify 184
+#define __NR_mq_open 180
+#define __NR_mq_timedreceive_time64 419
+#define __NR_mq_timedsend_time64 418
+#define __NR_mq_unlink 181
+#define __NR_mremap 216
+#define __NR_msgctl 187
+#define __NR_msgget 186
+#define __NR_msgrcv 188
+#define __NR_msgsnd 189
+#define __NR_msync 227
+#define __NR_munlock 229
+#define __NR_munlockall 231
+#define __NR_munmap 215
+#define __NR_name_to_handle_at 264
+#define __NR_nanosleep 101
+#define __NR_nfsservctl 42
+#define __NR_open_by_handle_at 265
+#define __NR_open_tree 428
+#define __NR_openat 56
+#define __NR_openat2 437
+#define __NR_perf_event_open 241
+#define __NR_personality 92
+#define __NR_pidfd_getfd 438
+#define __NR_pidfd_open 434
+#define __NR_pidfd_send_signal 424
+#define __NR_pipe2 59
+#define __NR_pivot_root 41
+#define __NR_pkey_alloc 289
+#define __NR_pkey_free 290
+#define __NR_pkey_mprotect 288
+#define __NR_ppoll_time64 414
+#define __NR_prctl 167
+#define __NR_pread64 67
+#define __NR_preadv 69
+#define __NR_preadv2 286
+#define __NR_prlimit64 261
+#define __NR_process_vm_readv 270
+#define __NR_process_vm_writev 271
+#define __NR_pselect6_time64 413
+#define __NR_ptrace 117
+#define __NR_pwrite64 68
+#define __NR_pwritev 70
+#define __NR_pwritev2 287
+#define __NR_quotactl 60
+#define __NR_read 63
+#define __NR_readahead 213
+#define __NR_readlinkat 78
+#define __NR_readv 65
+#define __NR_reboot 142
+#define __NR_recvfrom 207
+#define __NR_recvmmsg_time64 417
+#define __NR_recvmsg 212
+#define __NR_remap_file_pages 234
+#define __NR_removexattr 14
+#define __NR_renameat 38
+#define __NR_renameat2 276
+#define __NR_request_key 218
+#define __NR_restart_syscall 128
+#define __NR_rseq 293
+#define __NR_rt_sigaction 134
+#define __NR_rt_sigpending 136
+#define __NR_rt_sigprocmask 135
+#define __NR_rt_sigqueueinfo 138
+#define __NR_rt_sigreturn 139
+#define __NR_rt_sigsuspend 133
+#define __NR_rt_sigtimedwait_time64 421
+#define __NR_rt_tgsigqueueinfo 240
+#define __NR_sched_get_priority_max 125
+#define __NR_sched_get_priority_min 126
+#define __NR_sched_getaffinity 123
+#define __NR_sched_getattr 275
+#define __NR_sched_getparam 121
+#define __NR_sched_getscheduler 120
+#define __NR_sched_rr_get_interval_time64 423
+#define __NR_sched_setaffinity 122
+#define __NR_sched_setattr 274
+#define __NR_sched_setparam 118
+#define __NR_sched_setscheduler 119
+#define __NR_sched_yield 124
+#define __NR_seccomp 277
+#define __NR_semctl 191
+#define __NR_semget 190
+#define __NR_semop 193
+#define __NR_semtimedop_time64 420
+#define __NR_sendfile64 71
+#define __NR_sendmmsg 269
+#define __NR_sendmsg 211
+#define __NR_sendto 206
+#define __NR_set_mempolicy 237
+#define __NR_set_robust_list 99
+#define __NR_set_tid_address 96
+#define __NR_setdomainname 162
+#define __NR_setfsgid 152
+#define __NR_setfsuid 151
+#define __NR_setgid 144
+#define __NR_setgroups 159
+#define __NR_sethostname 161
+#define __NR_setitimer 103
+#define __NR_setns 268
+#define __NR_setpgid 154
+#define __NR_setpriority 140
+#define __NR_setregid 143
+#define __NR_setresgid 149
+#define __NR_setresuid 147
+#define __NR_setreuid 145
+#define __NR_setrlimit 164
+#define __NR_setsid 157
+#define __NR_setsockopt 208
+#define __NR_settimeofday 170
+#define __NR_setuid 146
+#define __NR_setxattr 5
+#define __NR_shmat 196
+#define __NR_shmctl 195
+#define __NR_shmdt 197
+#define __NR_shmget 194
+#define __NR_shutdown 210
+#define __NR_sigaltstack 132
+#define __NR_signalfd4 74
+#define __NR_socket 198
+#define __NR_socketpair 199
+#define __NR_splice 76
+#define __NR_statfs64 43
+#define __NR_statx 291
+#define __NR_swapoff 225
+#define __NR_swapon 224
+#define __NR_symlinkat 36
+#define __NR_sync 81
+#define __NR_sync_file_range 84
+#define __NR_syncfs 267
+#define __NR_sysfs 247
+#define __NR_sysinfo 179
+#define __NR_syslog 116
+#define __NR_tee 77
+#define __NR_tgkill 131
+#define __NR_timer_create 107
+#define __NR_timer_delete 111
+#define __NR_timer_getoverrun 109
+#define __NR_timer_gettime 108
+#define __NR_timer_gettime64 408
+#define __NR_timer_settime 110
+#define __NR_timer_settime64 409
+#define __NR_timerfd_create 85
+#define __NR_timerfd_gettime64 410
+#define __NR_timerfd_settime64 411
+#define __NR_times 153
+#define __NR_tkill 130
+#define __NR_truncate64 45
+#define __NR_umask 166
+#define __NR_umount2 39
+#define __NR_uname 160
+#define __NR_unlinkat 35
+#define __NR_unshare 97
+#define __NR_userfaultfd 282
+#define __NR_utimensat_time64 412
+#define __NR_vhangup 58
+#define __NR_vmsplice 75
+#define __NR_wait4 260
+#define __NR_waitid 95
+#define __NR_write 64
+#define __NR_writev 66
new file mode 100644
@@ -0,0 +1,21 @@
+/* Bit size of the time_t type at glibc build time, general case.
+ Copyright (C) 2019-2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <bits/wordsize.h>
+
+#define __TIMESIZE 64
new file mode 100644
@@ -0,0 +1,98 @@
+/* clone() implementation for ARC.
+ Copyright (C) 2008-2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Andrew Jenner <andrew@codesourcery.com>, 2008.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+
+#include <sysdep.h>
+#define _ERRNO_H 1
+#include <bits/errno.h>
+#include <tcb-offsets.h>
+
+#define CLONE_SETTLS 0x00080000
+
+/* int clone(int (*fn)(void *), void *child_stack,
+ int flags, void *arg, ...
+ < pid_t *ptid, struct user_desc *tls, pid_t *ctid > );
+
+ NOTE: I'm assuming that the last 3 args are NOT var-args and in case all
+ 3 are not relevant, caller will nevertheless pass those as NULL.
+
+ clone syscall in kernel (ABI: CONFIG_CLONE_BACKWARDS)
+
+ int sys_clone(unsigned long int clone_flags,
+ unsigned long int newsp,
+ int __user *parent_tidptr,
+ void *tls,
+ int __user *child_tidptr). */
+
+ENTRY (__clone)
+ cmp r0, 0 ; @fn can't be NULL
+ cmp.ne r1, 0 ; @child_stack can't be NULL
+ bz .L__sys_err
+
+ ; save some of the orig args
+ ; r0 containg @fn will be clobbered AFTER syscall (with ret val)
+ ; rest are clobbered BEFORE syscall due to different arg ordering
+ mov r10, r0 ; @fn
+ mov r11, r3 ; @args
+ mov r12, r2 ; @clone_flags
+ mov r9, r5 ; @tls
+
+ ; adjust libc args for syscall
+
+ mov r0, r2 ; libc @flags is 1st syscall arg
+ mov r2, r4 ; libc @ptid
+ mov r3, r5 ; libc @tls
+ mov r4, r6 ; libc @ctid
+ mov r8, __NR_clone
+ ARC_TRAP_INSN
+
+ cmp r0, 0 ; return code : 0 new process, !0 parent
+ blt .L__sys_err2 ; < 0 (signed) error
+ jnz [blink] ; Parent returns
+
+ ; ----- child starts here ---------
+
+ ; Setup TP register (only recent kernels v4.19+ do that)
+ and.f 0, r12, CLONE_SETTLS
+ mov.nz r25, r9
+
+ ; child jumps off to @fn with @arg as argument, and returns here
+ jl.d [r10]
+ mov r0, r11
+
+ ; exit() with result from @fn (already in r0)
+ mov r8, __NR_exit
+ ARC_TRAP_INSN
+ ; In case it ever came back
+ flag 1
+
+.L__sys_err:
+ mov r0, -EINVAL
+.L__sys_err2:
+ ; (1) No need to make -ve kernel error code as positive errno
+ ; __syscall_error expects the -ve error code returned by kernel
+ ; (2) r0 still had orig -ve kernel error code
+ ; (3) Tail call to __syscall_error so we dont have to come back
+ ; here hence instead of jmp-n-link (reg push/pop) we do jmp
+ ; (4) No need to route __syscall_error via PLT, B is inherently
+ ; position independent
+ b __syscall_error
+PSEUDO_END (__clone)
+libc_hidden_def (__clone)
+weak_alias (__clone, clone)
new file mode 100644
@@ -0,0 +1,41 @@
+/* Regularize <asm/unistd.h> definitions. ARC version.
+ Copyright (C) 2020 Free Software Foundation, Inc.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+/* Adjustments to ARC asm-generic syscall ABI (3.9 kernel) for 64-bit time_t
+ support. */
+
+/* fstat64 and fstatat64 need to be replaced with statx. */
+
+#undef __NR_fstat64
+#undef __NR_fstatat64
+
+/* Replace all other 32-bit time syscalls with 64-bit variants. */
+
+# undef __NR_clock_adjtime
+# undef __NR_clock_getres
+# undef __NR_futex
+# undef __NR_mq_timedreceive
+# undef __NR_mq_timedsend
+# undef __NR_ppoll
+# undef __NR_pselect6
+# undef __NR_recvmmsg
+# undef __NR_rt_sigtimedwait
+# undef __NR_sched_rr_get_interval
+# undef __NR_semtimedop
+# undef __NR_timerfd_settime
+# undef __NR_timerfd_gettime
+# undef __NR_utimensat
new file mode 100644
@@ -0,0 +1,6 @@
+#define JMP_BUF_SIZE (32 + 1 + 64 / (8 * sizeof (unsigned long int))) * sizeof (unsigned long int)
+#define SIGJMP_BUF_SIZE (32 + 1 + 64 / (8 * sizeof (unsigned long int))) * sizeof (unsigned long int)
+#define JMP_BUF_ALIGN __alignof__ (unsigned long int)
+#define SIGJMP_BUF_ALIGN __alignof__ (unsigned long int)
+#define MASK_WAS_SAVED_OFFSET (32 * sizeof (unsigned long int))
+#define SAVED_MASK_OFFSET (33 * sizeof (unsigned long int))
new file mode 100644
@@ -0,0 +1,28 @@
+/* Set flags signalling availability of kernel features based on given
+ kernel version number.
+
+ Copyright (C) 2009-2020 Free Software Foundation, Inc.
+
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* The minimum supported kernel version for ARC is 5.1 (64-bit time, offsets),
+ although the asm-generic ABI is from 3.9 (when Linux port was merged). */
+
+#include_next <kernel-features.h>
+
+#undef __ASSUME_CLONE_DEFAULT
+#define __ASSUME_CLONE_BACKWARDS 1
new file mode 100644
@@ -0,0 +1,26 @@
+/* Copyright (C) 2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <bits/wordsize.h>
+
+/* Needed to elide the itemized copy code in common xstatconv.c. */
+#define STAT_IS_KERNEL_STAT 1
+
+/* Nice side-effect of 64-bit time_t switch is these are same. */
+#define XSTAT_IS_XSTAT64 1
+
+#define STATFS_IS_STATFS64 0
new file mode 100644
@@ -0,0 +1,27 @@
+/* mmap - map files or devices into memory. Linux/ARC version.
+ Copyright (C) 2017-2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef MMAP_ARC_INTERNAL_H
+#define MMAP_ARC_INTERNAL_H
+
+/* 8K is default but determine the shift dynamically with getpagesize. */
+#define MMAP2_PAGE_UNIT -1
+
+#include_next <mmap_internal.h>
+
+#endif
new file mode 100644
@@ -0,0 +1 @@
+/* Not needed. */
new file mode 100644
@@ -0,0 +1,31 @@
+/* ARC specific sigaction.
+ Copyright (C) 1997-2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#define SA_RESTORER 0x04000000
+
+extern void __default_rt_sa_restorer (void);
+
+#define SET_SA_RESTORER(kact, act) \
+ ({ \
+ (kact)->sa_restorer = __default_rt_sa_restorer; \
+ (kact)->sa_flags |= SA_RESTORER; \
+ })
+
+#define RESET_SA_RESTORER(act, kact)
+
+#include <sysdeps/unix/sysv/linux/sigaction.c>
new file mode 100644
@@ -0,0 +1,29 @@
+/* Default sigreturn stub for ARC Linux.
+ Copyright (C) 2005-2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <sys/syscall.h>
+#include <sysdep.h>
+#include <tcb-offsets.h>
+
+/* Note the NOP has to be outside body. */
+ nop
+ENTRY (__default_rt_sa_restorer)
+ mov r8, __NR_rt_sigreturn
+ ARC_TRAP_INSN
+ j_s [blink]
+PSEUDO_END_NOERRNO (__default_rt_sa_restorer)
new file mode 100644
@@ -0,0 +1,33 @@
+/* syscall - indirect system call.
+ Copyright (C) 2017-2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+ENTRY (syscall)
+ mov_s r8, r0
+ mov_s r0, r1
+ mov_s r1, r2
+ mov_s r2, r3
+ mov_s r3, r4
+ mov_s r4, r5
+ mov_s r5, r6
+
+ ARC_TRAP_INSN
+ brhi r0, -1024, .Lcall_syscall_err
+ j [blink]
+PSEUDO_END (syscall)
new file mode 100644
@@ -0,0 +1,3 @@
+# File name Caller Syscall name Args Strong name Weak names
+
+cacheflush - cacheflush i:pii _flush_cache cacheflush
new file mode 100644
@@ -0,0 +1 @@
+# ARC doesn't support sysctl.
new file mode 100644
@@ -0,0 +1,33 @@
+/* ARC wrapper for setting errno.
+ Copyright (C) 1997-2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include <errno.h>
+
+/* All syscall handlers land here to avoid generated code bloat due to
+ GOT reference to errno_location or it's equivalent. */
+int
+__syscall_error (int err_no)
+{
+ __set_errno (-err_no);
+ return -1;
+}
+
+#if IS_IN (libc)
+hidden_def (__syscall_error)
+#endif
new file mode 100644
@@ -0,0 +1,224 @@
+/* Assembler macros for ARC.
+ Copyright (C) 2000-2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _LINUX_ARC_SYSDEP_H
+#define _LINUX_ARC_SYSDEP_H 1
+
+#include <sysdeps/arc/sysdep.h>
+#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
+
+/* 32-bit time syscalls are not available, but the redefines allow generic
+ wrappers to work. */
+#define __NR_clock_adjtime __NR_clock_adjtime64
+#define __NR_clock_getres __NR_clock_getres_time64
+#define __NR_futex __NR_futex_time64
+#define __NR_mq_timedreceive __NR_mq_timedreceive_time64
+#define __NR_mq_timedsend __NR_mq_timedsend_time64
+#define __NR_ppoll __NR_ppoll_time64
+#define __NR_pselect6 __NR_pselect6_time64
+#define __NR_recvmmsg __NR_recvmmsg_time64
+#define __NR_rt_sigtimedwait __NR_rt_sigtimedwait_time64
+#define __NR_sched_rr_get_interval __NR_sched_rr_get_interval_time64
+#define __NR_semtimedop __NR_semtimedop_time64
+#define __NR_timerfd_gettime __NR_timerfd_gettime64
+#define __NR_timerfd_settime __NR_timerfd_settime64
+#define __NR_utimensat __NR_utimensat_time64
+
+/* For RTLD_PRIVATE_ERRNO. */
+#include <dl-sysdep.h>
+
+#include <tls.h>
+
+#undef SYS_ify
+#define SYS_ify(syscall_name) __NR_##syscall_name
+
+#ifdef __ASSEMBLER__
+
+/* This is a "normal" system call stub: if there is an error,
+ it returns -1 and sets errno. */
+
+# undef PSEUDO
+# define PSEUDO(name, syscall_name, args) \
+ PSEUDO_NOERRNO(name, syscall_name, args) ASM_LINE_SEP \
+ brhi r0, -4096, .Lcall_syscall_err ASM_LINE_SEP
+
+# define ret j_s [blink]
+
+# undef PSEUDO_END
+# define PSEUDO_END(name) \
+ SYSCALL_ERROR_HANDLER ASM_LINE_SEP \
+ END (name)
+
+/* --------- Helper for SYSCALL_NOERRNO -----------
+ This kind of system call stub never returns an error.
+ We return the return value register to the caller unexamined. */
+
+# undef PSEUDO_NOERRNO
+# define PSEUDO_NOERRNO(name, syscall_name, args) \
+ .text ASM_LINE_SEP \
+ ENTRY (name) ASM_LINE_SEP \
+ DO_CALL (syscall_name, args) ASM_LINE_SEP \
+
+/* Return the return value register unexamined. Since r0 is both
+ syscall return reg and function return reg, no work needed. */
+# define ret_NOERRNO \
+ j_s [blink] ASM_LINE_SEP
+
+# undef PSEUDO_END_NOERRNO
+# define PSEUDO_END_NOERRNO(name) \
+ END (name)
+
+/* --------- Helper for SYSCALL_ERRVAL -----------
+ This kind of system call stub returns the errno code as its return
+ value, or zero for success. We may massage the kernel's return value
+ to meet that ABI, but we never set errno here. */
+
+# undef PSEUDO_ERRVAL
+# define PSEUDO_ERRVAL(name, syscall_name, args) \
+ PSEUDO_NOERRNO(name, syscall_name, args) ASM_LINE_SEP
+
+/* Don't set errno, return kernel error (in errno form) or zero. */
+# define ret_ERRVAL \
+ rsub r0, r0, 0 ASM_LINE_SEP \
+ ret_NOERRNO
+
+# undef PSEUDO_END_ERRVAL
+# define PSEUDO_END_ERRVAL(name) \
+ END (name)
+
+
+/* To reduce the code footprint, we confine the actual errno access
+ to single place in __syscall_error().
+ This takes raw kernel error value, sets errno and returns -1. */
+# if IS_IN (libc)
+# define CALL_ERRNO_SETTER_C bl PLTJMP(HIDDEN_JUMPTARGET(__syscall_error))
+# else
+# define CALL_ERRNO_SETTER_C bl PLTJMP(__syscall_error)
+# endif
+
+# define SYSCALL_ERROR_HANDLER \
+.Lcall_syscall_err: ASM_LINE_SEP \
+ push_s blink ASM_LINE_SEP \
+ cfi_adjust_cfa_offset (4) ASM_LINE_SEP \
+ cfi_rel_offset (blink, 0) ASM_LINE_SEP \
+ CALL_ERRNO_SETTER_C ASM_LINE_SEP \
+ pop_s blink ASM_LINE_SEP \
+ cfi_adjust_cfa_offset (-4) ASM_LINE_SEP \
+ cfi_restore (blink) ASM_LINE_SEP \
+ j_s [blink]
+
+# define DO_CALL(syscall_name, args) \
+ mov r8, SYS_ify (syscall_name) ASM_LINE_SEP \
+ ARC_TRAP_INSN ASM_LINE_SEP
+
+# define ARC_TRAP_INSN trap_s 0
+
+#else /* !__ASSEMBLER__ */
+
+# define SINGLE_THREAD_BY_GLOBAL 1
+
+# if IS_IN (libc)
+extern int __syscall_error (int);
+hidden_proto (__syscall_error)
+# endif
+
+# define ARC_TRAP_INSN "trap_s 0 \n\t"
+
+# undef INTERNAL_SYSCALL_NCS
+# define INTERNAL_SYSCALL_NCS(number, nr_args, args...) \
+ ({ \
+ /* Per ABI, r0 is 1st arg and return reg. */ \
+ register int __ret __asm__("r0"); \
+ register int _sys_num __asm__("r8"); \
+ \
+ LOAD_ARGS_##nr_args (number, args) \
+ \
+ __asm__ volatile ( \
+ ARC_TRAP_INSN \
+ : "+r" (__ret) \
+ : "r"(_sys_num) ASM_ARGS_##nr_args \
+ : "memory"); \
+ \
+ __ret; })
+
+# undef INTERNAL_SYSCALL
+# define INTERNAL_SYSCALL(name, nr, args...) \
+ INTERNAL_SYSCALL_NCS(SYS_ify(name), nr, args)
+
+/* Macros for setting up inline __asm__ input regs. */
+# define ASM_ARGS_0
+# define ASM_ARGS_1 ASM_ARGS_0, "r" (__ret)
+# define ASM_ARGS_2 ASM_ARGS_1, "r" (_arg2)
+# define ASM_ARGS_3 ASM_ARGS_2, "r" (_arg3)
+# define ASM_ARGS_4 ASM_ARGS_3, "r" (_arg4)
+# define ASM_ARGS_5 ASM_ARGS_4, "r" (_arg5)
+# define ASM_ARGS_6 ASM_ARGS_5, "r" (_arg6)
+# define ASM_ARGS_7 ASM_ARGS_6, "r" (_arg7)
+
+/* Macros for converting sys-call wrapper args into sys call args. */
+# define LOAD_ARGS_0(nm, arg) \
+ _sys_num = (int) (nm);
+
+# define LOAD_ARGS_1(nm, arg1) \
+ __ret = (int) (arg1); \
+ LOAD_ARGS_0 (nm, arg1)
+
+/* Note that the use of _tmpX might look superflous, however it is needed
+ to ensure that register variables are not clobbered if arg happens to be
+ a function call itself. e.g. sched_setaffinity() calling getpid() for arg2
+ Also this specific order of recursive calling is important to segregate
+ the tmp args evaluation (function call case described above) and assigment
+ of register variables. */
+
+# define LOAD_ARGS_2(nm, arg1, arg2) \
+ int _tmp2 = (int) (arg2); \
+ LOAD_ARGS_1 (nm, arg1) \
+ register int _arg2 __asm__ ("r1") = _tmp2;
+
+# define LOAD_ARGS_3(nm, arg1, arg2, arg3) \
+ int _tmp3 = (int) (arg3); \
+ LOAD_ARGS_2 (nm, arg1, arg2) \
+ register int _arg3 __asm__ ("r2") = _tmp3;
+
+#define LOAD_ARGS_4(nm, arg1, arg2, arg3, arg4) \
+ int _tmp4 = (int) (arg4); \
+ LOAD_ARGS_3 (nm, arg1, arg2, arg3) \
+ register int _arg4 __asm__ ("r3") = _tmp4;
+
+# define LOAD_ARGS_5(nm, arg1, arg2, arg3, arg4, arg5) \
+ int _tmp5 = (int) (arg5); \
+ LOAD_ARGS_4 (nm, arg1, arg2, arg3, arg4) \
+ register int _arg5 __asm__ ("r4") = _tmp5;
+
+# define LOAD_ARGS_6(nm, arg1, arg2, arg3, arg4, arg5, arg6)\
+ int _tmp6 = (int) (arg6); \
+ LOAD_ARGS_5 (nm, arg1, arg2, arg3, arg4, arg5) \
+ register int _arg6 __asm__ ("r5") = _tmp6;
+
+# define LOAD_ARGS_7(nm, arg1, arg2, arg3, arg4, arg5, arg6, arg7)\
+ int _tmp7 = (int) (arg7); \
+ LOAD_ARGS_6 (nm, arg1, arg2, arg3, arg4, arg5, arg6) \
+ register int _arg7 __asm__ ("r6") = _tmp7;
+
+/* Pointer mangling not yet supported. */
+# define PTR_MANGLE(var) (void) (var)
+# define PTR_DEMANGLE(var) (void) (var)
+
+#endif /* !__ASSEMBLER__ */
+
+#endif /* linux/arc/sysdep.h */
new file mode 100644
@@ -0,0 +1,42 @@
+/* vfork for ARC Linux.
+ Copyright (C) 2005-2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <sys/syscall.h>
+#include <sysdep.h>
+#include <tcb-offsets.h>
+#define _SIGNAL_H
+#include <bits/signum.h> /* For SIGCHLD */
+
+#define CLONE_VM 0x00000100
+#define CLONE_VFORK 0x00004000
+#define CLONE_FLAGS_FOR_VFORK (CLONE_VM|CLONE_VFORK|SIGCHLD)
+
+ENTRY (__vfork)
+ mov r0, CLONE_FLAGS_FOR_VFORK
+ mov_s r1, sp
+ mov r8, __NR_clone
+ ARC_TRAP_INSN
+
+ cmp r0, 0
+ jge [blink] ; child continues
+
+ b __syscall_error
+PSEUDO_END (__vfork)
+libc_hidden_def (__vfork)
+
+weak_alias (__vfork, vfork)