From aa65e03df89596fef1d249573779692681f638a6 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Wed, 12 Aug 2015 12:10:06 -0700 Subject: [PATCH 3/3] i386: Remove syscall assembly codes with 6 arguments This patch removes i386 assembly implementation for epoll_wait, mmap, mmap64, semtimeop now that i386 have 6 argument syscall support from C code and GCC 5 can inline syscalls with 6 argument. We also compile epoll_pwait.c, mmap.c, mmap64.c and semtimedop.c with -fomit-frame-pointer since %ebp may be used to pass the 6th argument to syscall. Fo sysdeps/unix/sysv/linux/i386/mmap.c, with -O2 -march=i686 -mtune=generic, GCC 5.2 now generates: <__mmap>: 0: sub $0x10,%esp 3: mov 0x28(%esp),%eax 7: mov %ebx,(%esp) a: mov 0x18(%esp),%ecx e: mov %esi,0x4(%esp) 12: mov 0x14(%esp),%ebx 16: mov %edi,0x8(%esp) 1a: mov 0x1c(%esp),%edx 1e: test $0xfff,%eax 23: mov 0x20(%esp),%esi 27: mov %ebp,0xc(%esp) 2b: mov 0x24(%esp),%edi 2f: jne 60 <__mmap+0x60> 31: shr $0xc,%eax 34: mov %eax,%ebp 36: mov $0xc0,%eax 3b: call *%gs:0x10 42: cmp $0xfffff000,%eax 47: ja 65 <__mmap+0x65> 49: mov (%esp),%ebx 4c: mov 0x4(%esp),%esi 50: mov 0x8(%esp),%edi 54: mov 0xc(%esp),%ebp 58: add $0x10,%esp 5b: ret 5c: lea 0x0(%esi,%eiz,1),%esi 60: mov $0xffffffea,%eax 65: mov (%esp),%ebx 68: mov 0x4(%esp),%esi 6c: mov 0x8(%esp),%edi 70: mov 0xc(%esp),%ebp 74: add $0x10,%esp 77: jmp 78 <__mmap+0x78> vs sysdeps/unix/sysv/linux/i386/mmap.S: <__mmap>: 0: push %ebp 1: push %ebx 2: push %esi 3: push %edi 4: mov 0x14(%esp),%ebx 8: mov 0x18(%esp),%ecx c: mov 0x1c(%esp),%edx 10: mov 0x20(%esp),%esi 14: mov 0x24(%esp),%edi 18: mov 0x28(%esp),%ebp 1c: test $0xfff,%ebp 22: mov $0xffffffea,%eax 27: jne 38 <__mmap+0x38> 29: shr $0xc,%ebp 2c: mov $0xc0,%eax 31: call *%gs:0x10 38: pop %edi 39: pop %esi 3a: pop %ebx 3b: pop %ebp 3c: cmp $0xfffff000,%eax 41: ja 44 <__mmap+0x44> 43: ret 44: call 45 <__mmap+0x45> 45: R_386_PC32 __x86.get_pc_thunk.cx 49: add $0x2,%ecx 4b: R_386_GOTPC _GLOBAL_OFFSET_TABLE_ 4f: mov 0x0(%ecx),%ecx 51: R_386_TLS_GOTIE __libc_errno 55: neg %eax 57: mov %eax,%gs:(%ecx) 5a: or $0xffffffff,%eax 5d: ret The C version has: 3: mov 0x28(%esp),%eax ... 1e: test $0xfff,%eax ... 31: sar $0xc,%eax 34: mov %eax,%ebp is due to missing $ebx register constraint for inline asm. We have to use "r" constraint with register unsigned int _a6 asm ("ebp") = (unsigned int) (arg6); and compiler chose %eax for offset (arg6) in if (offset & (MMAP_PAGE_UNIT - 1)) * sysdeps/unix/sysv/linux/i386/Makefile (CFLAGS-epoll_pwait.c): Add -fomit-frame-pointer. (CFLAGS-mmap.c): Likewise. (CFLAGS-mmap64.c): Likewise. (CFLAGS-semtimedop.c): Likewise. * sysdeps/unix/sysv/linux/i386/mmap.c: New file. * sysdeps/unix/sysv/linux/i386/epoll_pwait.S: Remove file. * sysdeps/unix/sysv/linux/i386/mmap.S: Likewise. * sysdeps/unix/sysv/linux/i386/mmap64.S: Likewise. * sysdeps/unix/sysv/linux/i386/semtimedop.S: Likewise. --- sysdeps/unix/sysv/linux/i386/Makefile | 9 +++ sysdeps/unix/sysv/linux/i386/epoll_pwait.S | 78 ------------------- sysdeps/unix/sysv/linux/i386/mmap.S | 79 -------------------- sysdeps/unix/sysv/linux/i386/mmap.c | 36 +++++++++ sysdeps/unix/sysv/linux/i386/mmap64.S | 116 ----------------------------- sysdeps/unix/sysv/linux/i386/semtimedop.S | 73 ------------------ 6 files changed, 45 insertions(+), 346 deletions(-) delete mode 100644 sysdeps/unix/sysv/linux/i386/epoll_pwait.S delete mode 100644 sysdeps/unix/sysv/linux/i386/mmap.S create mode 100644 sysdeps/unix/sysv/linux/i386/mmap.c delete mode 100644 sysdeps/unix/sysv/linux/i386/mmap64.S delete mode 100644 sysdeps/unix/sysv/linux/i386/semtimedop.S diff --git a/sysdeps/unix/sysv/linux/i386/Makefile b/sysdeps/unix/sysv/linux/i386/Makefile index e10d133..b484217 100644 --- a/sysdeps/unix/sysv/linux/i386/Makefile +++ b/sysdeps/unix/sysv/linux/i386/Makefile @@ -3,6 +3,15 @@ default-abi := 32 ifeq ($(subdir),misc) sysdep_routines += ioperm iopl vm86 +# %ebp may be used to pass the 6th argument to syscall. +CFLAGS-epoll_pwait.c += -fomit-frame-pointer +CFLAGS-mmap.c += -fomit-frame-pointer +CFLAGS-mmap64.c += -fomit-frame-pointer +endif + +ifeq ($(subdir),sysvipc) +# %ebp may be used to pass the 6th argument to syscall. +CFLAGS-semtimedop.c += -fomit-frame-pointer endif ifeq ($(subdir),elf) diff --git a/sysdeps/unix/sysv/linux/i386/epoll_pwait.S b/sysdeps/unix/sysv/linux/i386/epoll_pwait.S deleted file mode 100644 index 65cfb98..0000000 --- a/sysdeps/unix/sysv/linux/i386/epoll_pwait.S +++ /dev/null @@ -1,78 +0,0 @@ -/* Copyright (C) 2007-2015 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 - . */ - -#include -#define _ERRNO_H -#include -#define _SIGNAL_H -#include - - - .text -ENTRY (epoll_pwait) - -#ifdef __NR_epoll_pwait - - /* Save registers. */ - pushl %ebp - cfi_adjust_cfa_offset (4) - pushl %ebx - cfi_adjust_cfa_offset (4) - pushl %esi - cfi_adjust_cfa_offset (4) - pushl %edi - cfi_adjust_cfa_offset (4) - cfi_rel_offset (edi, 0) - cfi_rel_offset (esi, 4) - cfi_rel_offset (ebx, 8) - cfi_rel_offset (ebp, 12) - - movl 20(%esp), %ebx - movl 24(%esp), %ecx - movl 28(%esp), %edx - movl 32(%esp), %esi - movl 36(%esp), %edi - movl $_NSIG/8, %ebp - movl $__NR_epoll_pwait, %eax - - ENTER_KERNEL - - /* Restore registers. */ - popl %edi - cfi_adjust_cfa_offset (-4) - cfi_restore (edi) - popl %esi - cfi_adjust_cfa_offset (-4) - cfi_restore (esi) - popl %ebx - cfi_adjust_cfa_offset (-4) - cfi_restore (ebx) - popl %ebp - cfi_adjust_cfa_offset (-4) - cfi_restore (ebp) - - /* If 0 > %eax > -4096 there was an error. */ - cmpl $-4096, %eax - ja SYSCALL_ERROR_LABEL - - /* Successful; return the syscall's value. */ -#else - movl $-ENOSYS, %eax - jmp SYSCALL_ERROR_LABEL -#endif - ret -PSEUDO_END (epoll_pwait) diff --git a/sysdeps/unix/sysv/linux/i386/mmap.S b/sysdeps/unix/sysv/linux/i386/mmap.S deleted file mode 100644 index daf807a..0000000 --- a/sysdeps/unix/sysv/linux/i386/mmap.S +++ /dev/null @@ -1,79 +0,0 @@ -/* Copyright (C) 1995-2015 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 - . */ - -#include - -#define EINVAL 22 - - .text - -ENTRY (__mmap) - - /* Save registers. */ - pushl %ebp - cfi_adjust_cfa_offset (4) - pushl %ebx - cfi_adjust_cfa_offset (4) - pushl %esi - cfi_adjust_cfa_offset (4) - pushl %edi - cfi_adjust_cfa_offset (4) - - movl 20(%esp), %ebx - cfi_rel_offset (ebx, 8) - movl 24(%esp), %ecx - movl 28(%esp), %edx - movl 32(%esp), %esi - cfi_rel_offset (esi, 4) - movl 36(%esp), %edi - cfi_rel_offset (edi, 0) - movl 40(%esp), %ebp - cfi_rel_offset (ebp, 12) - testl $0xfff, %ebp - movl $-EINVAL, %eax - jne L(skip) - shrl $12, %ebp /* mmap2 takes the offset in pages. */ - - movl $SYS_ify(mmap2), %eax /* System call number in %eax. */ - - /* Do the system call trap. */ - ENTER_KERNEL -L(skip): - /* Restore registers. */ - popl %edi - cfi_adjust_cfa_offset (-4) - cfi_restore (edi) - popl %esi - cfi_adjust_cfa_offset (-4) - cfi_restore (esi) - popl %ebx - cfi_adjust_cfa_offset (-4) - cfi_restore (ebx) - popl %ebp - cfi_adjust_cfa_offset (-4) - cfi_restore (ebp) - - /* If 0 > %eax > -4096 there was an error. */ - cmpl $-4096, %eax - ja SYSCALL_ERROR_LABEL - - /* Successful; return the syscall's value. */ - ret - -PSEUDO_END (__mmap) - -weak_alias (__mmap, mmap) diff --git a/sysdeps/unix/sysv/linux/i386/mmap.c b/sysdeps/unix/sysv/linux/i386/mmap.c new file mode 100644 index 0000000..6be8692 --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/mmap.c @@ -0,0 +1,36 @@ +/* Copyright (C) 2015 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 + . */ + +#include +#include +#include +#include + +#ifndef MMAP_PAGE_UNIT +# define MMAP_PAGE_UNIT 4096UL +#endif + +__ptr_t +__mmap (__ptr_t addr, size_t len, int prot, int flags, int fd, off_t offset) +{ + if (offset & (MMAP_PAGE_UNIT - 1)) + return (__ptr_t) INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL); + return (__ptr_t) INLINE_SYSCALL (mmap2, 6, addr, len, prot, flags, fd, + offset / MMAP_PAGE_UNIT); +} + +weak_alias (__mmap, mmap) diff --git a/sysdeps/unix/sysv/linux/i386/mmap64.S b/sysdeps/unix/sysv/linux/i386/mmap64.S deleted file mode 100644 index 3cf6eb9..0000000 --- a/sysdeps/unix/sysv/linux/i386/mmap64.S +++ /dev/null @@ -1,116 +0,0 @@ -/* Copyright (C) 1995-2015 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 - . */ - -#include - -#define EINVAL 22 -#define ENOSYS 38 - -#define SVRSP 16 /* saved register space */ -#define PARMS 4+SVRSP /* space for 4 saved regs */ -#define ADDR PARMS -#define LEN ADDR+4 -#define PROT LEN+4 -#define FLAGS PROT+4 -#define FD FLAGS+4 -#define OFFLO FD+4 -#define OFFHI OFFLO+4 - - .text -ENTRY (__mmap64) - - /* Save registers. */ - pushl %ebp - cfi_adjust_cfa_offset (4) - pushl %ebx - cfi_adjust_cfa_offset (4) - pushl %esi - cfi_adjust_cfa_offset (4) - pushl %edi - cfi_adjust_cfa_offset (4) - - movl OFFLO(%esp), %edx - movl OFFHI(%esp), %ecx - testl $0xfff, %edx - jne L(einval) - shrdl $12, %ecx, %edx /* mmap2 takes the offset in pages. */ - shrl $12, %ecx - jne L(einval) - movl %edx, %ebp - cfi_rel_offset (ebp, 12) - - movl ADDR(%esp), %ebx - cfi_rel_offset (ebx, 8) - movl LEN(%esp), %ecx - movl PROT(%esp), %edx - movl FLAGS(%esp), %esi - cfi_rel_offset (esi, 4) - movl FD(%esp), %edi - cfi_rel_offset (edi, 0) - - movl $SYS_ify(mmap2), %eax /* System call number in %eax. */ - - /* Do the system call trap. */ -L(do_syscall): - ENTER_KERNEL - - /* Restore registers. */ - popl %edi - cfi_adjust_cfa_offset (-4) - cfi_restore (edi) - popl %esi - cfi_adjust_cfa_offset (-4) - cfi_restore (esi) - popl %ebx - cfi_adjust_cfa_offset (-4) - cfi_restore (ebx) - popl %ebp - cfi_adjust_cfa_offset (-4) - cfi_restore (ebp) - - /* If 0 > %eax > -4096 there was an error. */ - cmpl $-4096, %eax - ja SYSCALL_ERROR_LABEL - - /* Successful; return the syscall's value. */ - ret - - cfi_adjust_cfa_offset (16) - cfi_rel_offset (ebp, 12) - cfi_rel_offset (ebx, 8) - cfi_rel_offset (esi, 4) - cfi_rel_offset (edi, 0) - /* This means the offset value is too large. */ -L(einval): - popl %edi - cfi_adjust_cfa_offset (-4) - cfi_restore (edi) - popl %esi - cfi_adjust_cfa_offset (-4) - cfi_restore (esi) - popl %ebx - cfi_adjust_cfa_offset (-4) - cfi_restore (ebx) - popl %ebp - cfi_adjust_cfa_offset (-4) - cfi_restore (ebp) - movl $-EINVAL, %eax - jmp SYSCALL_ERROR_LABEL - -PSEUDO_END (__mmap64) - -weak_alias (__mmap64, mmap64) diff --git a/sysdeps/unix/sysv/linux/i386/semtimedop.S b/sysdeps/unix/sysv/linux/i386/semtimedop.S deleted file mode 100644 index 80477b7..0000000 --- a/sysdeps/unix/sysv/linux/i386/semtimedop.S +++ /dev/null @@ -1,73 +0,0 @@ -/* Copyright (C) 2003-2015 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper , 2003. - - 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 - . */ - -#include - -#define SYSOP_semtimedop 4 - -#define SVRSP 12 /* saved register space */ -#define PARMS 4+SVRSP /* space for 3 saved regs */ -#define SEMID PARMS -#define SOPS SEMID+4 -#define NSOPS SOPS+4 -#define TIMEOUT NSOPS+4 - - .text -ENTRY (semtimedop) - - pushl %ebp - cfi_adjust_cfa_offset (4) - pushl %ebx - cfi_adjust_cfa_offset (4) - pushl %edi - cfi_adjust_cfa_offset (4) - - movl $SYSOP_semtimedop, %ebx - cfi_rel_offset (ebx, 4) - movl SEMID(%esp), %ecx - movl NSOPS(%esp), %edx - movl SOPS(%esp), %edi - cfi_rel_offset (edi, 0) - movl TIMEOUT(%esp), %ebp - cfi_rel_offset (ebp, 8) - movl $__NR_ipc, %eax - - ENTER_KERNEL - - /* Restore registers. */ - popl %edi - cfi_adjust_cfa_offset (-4) - cfi_restore (edi) - popl %ebx - cfi_adjust_cfa_offset (-4) - cfi_restore (ebx) - popl %ebp - cfi_adjust_cfa_offset (-4) - cfi_restore (ebp) - - /* If 0 > %eax > -4096 there was an error. */ - cmpl $-4096, %eax - ja SYSCALL_ERROR_LABEL - - /* Successful; return the syscall's value. */ - ret - -#ifdef PIC - .align 4 -#endif -PSEUDO_END (semtimedop) -- 2.4.3