new file mode 100644
@@ -0,0 +1,32 @@
+/* pthread machine parameter definitions, ARC version.
+ Copyright (C) 2002-2020 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/>. */
+
+/* Default stack size. */
+#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024)
+
+/* Required stack pointer alignment at beginning. */
+#define STACK_ALIGN 4
+
+/* Minimal stack size after allocating thread descriptor and guard size. */
+#define MINIMAL_REST_STACK 2048
+
+/* Alignment requirement for TCB. */
+#define TCB_ALIGNMENT 4
+
+/* Location of current stack frame. */
+#define CURRENT_STACK_FRAME __builtin_frame_address (0)
new file mode 100644
@@ -0,0 +1,35 @@
+/* Types for registers for sys/procfs.h. ARC version.
+ Copyright (C) 1996-2020 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 _SYS_PROCFS_H
+# error "Never include <bits/procfs.h> directly; use <sys/procfs.h> instead."
+#endif
+
+#include <sys/ucontext.h>
+
+/* And the whole bunch of them. We could have used `struct
+ user_regs' directly in the typedef, but tradition says that
+ the register set is an array, which does have some peculiar
+ semantics, so leave it that way. */
+#define ELF_NGREG (sizeof (struct user_regs_struct) / sizeof(elf_greg_t))
+
+typedef unsigned long int elf_greg_t;
+typedef unsigned long int elf_gregset_t[ELF_NGREG];
+
+/* There's no seperate floating point reg file in ARCv2. */
+typedef struct { } elf_fpregset_t;
new file mode 100644
@@ -0,0 +1,12 @@
+/* Architecture-specific __sigset_t definition. ARC version. */
+#ifndef ____sigset_t_defined
+#define ____sigset_t_defined
+
+/* Linux asm-generic syscall ABI expects sigset_t to hold 64 signals. */
+#define _SIGSET_NWORDS (64 / (8 * sizeof (unsigned long int)))
+typedef struct
+{
+ unsigned long int __val[_SIGSET_NWORDS];
+} __sigset_t;
+
+#endif
new file mode 100644
@@ -0,0 +1,63 @@
+/* Save current context for ARC.
+ 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/>. */
+
+#include "ucontext-macros.h"
+
+/* int getcontext (ucontext_t *ucp)
+ Save machine context in @ucp and return 0 on success, -1 on error
+ - saves callee saved registers only
+ - layout mandated by uncontext_t:m_context (hence different from setjmp). */
+
+ENTRY (__getcontext)
+
+ /* Callee saved registers. */
+ SAVE_REG (r13, r0, 37)
+ SAVE_REG (r14, r0, 36)
+ SAVE_REG (r15, r0, 35)
+ SAVE_REG (r16, r0, 34)
+ SAVE_REG (r17, r0, 33)
+ SAVE_REG (r18, r0, 32)
+ SAVE_REG (r19, r0, 31)
+ SAVE_REG (r20, r0, 30)
+ SAVE_REG (r21, r0, 29)
+ SAVE_REG (r22, r0, 28)
+ SAVE_REG (r23, r0, 27)
+ SAVE_REG (r24, r0, 26)
+ SAVE_REG (r25, r0, 25)
+
+ SAVE_REG (blink, r0, 7)
+ SAVE_REG (fp, r0, 8)
+ SAVE_REG (sp, r0, 23)
+
+ /* Save 0 in r0 placeholder to return 0 when this @ucp activated. */
+ mov r9, 0
+ SAVE_REG (r9, r0, 22)
+
+ /* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8). */
+ mov r3, _NSIG8
+ add r2, r0, UCONTEXT_SIGMASK
+ mov r1, 0
+ mov r0, SIG_BLOCK
+ mov r8, __NR_rt_sigprocmask
+ ARC_TRAP_INSN
+ brhi r0, -1024, .Lcall_syscall_err
+ j.d [blink]
+ mov r0, 0 /* Success, error handled in .Lcall_syscall_err. */
+
+PSEUDO_END (__getcontext)
+weak_alias (__getcontext, getcontext)
new file mode 100644
@@ -0,0 +1,75 @@
+/* Create new context for ARC.
+ Copyright (C) 2015-2020 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 <stdarg.h>
+#include <stdint.h>
+#include <sys/ucontext.h>
+
+void
+__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
+{
+ extern void __startcontext (void) attribute_hidden;
+ unsigned long int sp, *r;
+ va_list vl;
+ int i, reg_args, stack_args;
+
+ sp = ((unsigned long int) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size) & ~7;
+
+ ucp->uc_mcontext.__scratch.__sp = sp;
+ ucp->uc_mcontext.__scratch.__fp = 0;
+
+ /* __startcontext is sort of trampoline to invoke @func
+ From setcontext() pov, the resume address is __startcontext,
+ set it up in BLINK place holder. */
+
+ ucp->uc_mcontext.__scratch.__blink = (unsigned long int) &__startcontext;
+
+ /* __startcontext passed 2 types of args
+ - args to @func setup in canonical r0-r7
+ - @func itself in r9, and next function in r10. */
+
+ ucp->uc_mcontext.__callee.__r13 = (unsigned long int) func;
+ ucp->uc_mcontext.__callee.__r14 = (unsigned long int) ucp->uc_link;
+
+ r = &ucp->uc_mcontext.__scratch.__r0;
+
+ va_start (vl, argc);
+
+ reg_args = argc > 8 ? 8 : argc;
+ for (i = 0; i < reg_args; i++) {
+ *r-- = va_arg(vl, unsigned long int);
+ }
+
+ stack_args = argc - reg_args;
+
+ if (__glibc_unlikely (stack_args > 0)) {
+
+ sp -= stack_args * sizeof (unsigned long int);
+ ucp->uc_mcontext.__scratch.__sp = sp;
+ r = (unsigned long int *)sp;
+
+ for (i = 0; i < stack_args; i++) {
+ *r++ = va_arg(vl, unsigned long int);
+ }
+ }
+
+ va_end (vl);
+}
+
+weak_alias (__makecontext, makecontext)
new file mode 100644
@@ -0,0 +1,92 @@
+/* Set current context for ARC.
+ 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/>. */
+
+#include "ucontext-macros.h"
+
+/* int setcontext (const ucontext_t *ucp)
+ - Restores the machine context in @ucp and resumes execution
+ (doesn't return to caller). */
+
+ENTRY (__setcontext)
+
+ mov r9, r0 /* Stash @ucp across syscall. */
+
+ /* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */
+ mov r3, _NSIG8
+ mov r2, 0
+ add r1, r0, UCONTEXT_SIGMASK
+ mov r0, SIG_SETMASK
+ mov r8, __NR_rt_sigprocmask
+ ARC_TRAP_INSN
+ brhi r0, -1024, .Lcall_syscall_err
+
+ /* Restore scratch/arg regs for makecontext() case. */
+ LOAD_REG (r0, r9, 22)
+ LOAD_REG (r1, r9, 21)
+ LOAD_REG (r2, r9, 20)
+ LOAD_REG (r3, r9, 19)
+ LOAD_REG (r4, r9, 18)
+ LOAD_REG (r5, r9, 17)
+ LOAD_REG (r6, r9, 16)
+ LOAD_REG (r7, r9, 15)
+
+ /* Restore callee saved registers. */
+ LOAD_REG (r13, r9, 37)
+ LOAD_REG (r14, r9, 36)
+ LOAD_REG (r15, r9, 35)
+ LOAD_REG (r16, r9, 34)
+ LOAD_REG (r17, r9, 33)
+ LOAD_REG (r18, r9, 32)
+ LOAD_REG (r19, r9, 31)
+ LOAD_REG (r20, r9, 30)
+ LOAD_REG (r21, r9, 29)
+ LOAD_REG (r22, r9, 28)
+ LOAD_REG (r23, r9, 27)
+ LOAD_REG (r24, r9, 26)
+ LOAD_REG (r25, r9, 25)
+
+ LOAD_REG (blink, r9, 7)
+ LOAD_REG (fp, r9, 8)
+ LOAD_REG (sp, r9, 23)
+
+ j [blink]
+
+PSEUDO_END (__setcontext)
+weak_alias (__setcontext, setcontext)
+
+
+/* Helper for activating makecontext() created context
+ - r13 has @func, r14 has uc_link. */
+
+ENTRY (__startcontext)
+
+ .cfi_label .Ldummy
+ cfi_undefined (blink)
+
+ /* Call user @func, loaded in r13 by setcontext(). */
+ jl [r13]
+
+ /* If uc_link (r14) call setcontext with that. */
+ mov r0, r14
+ breq r0, 0, 1f
+
+ bl __setcontext
+1:
+ /* Exit with status 0. */
+ b HIDDEN_JUMPTARGET(exit)
+END (__startcontext)
new file mode 100644
@@ -0,0 +1,28 @@
+/* ARC definitions for signal handling calling conventions.
+ 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 _SIGCONTEXTINFO_H
+#define _SIGCONTEXTINFO_H
+
+static inline uintptr_t
+sigcontext_get_pc (const ucontext_t *ctx)
+{
+ return ctx->uc_mcontext.__scratch.__ret;
+}
+
+#endif
new file mode 100644
@@ -0,0 +1,92 @@
+/* Save and set current context for ARC.
+ 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/>. */
+
+#include "ucontext-macros.h"
+
+/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp). */
+
+ENTRY (__swapcontext)
+
+ /* Save context into @oucp pointed to by r0. */
+
+ SAVE_REG (r13, r0, 37)
+ SAVE_REG (r14, r0, 36)
+ SAVE_REG (r15, r0, 35)
+ SAVE_REG (r16, r0, 34)
+ SAVE_REG (r17, r0, 33)
+ SAVE_REG (r18, r0, 32)
+ SAVE_REG (r19, r0, 31)
+ SAVE_REG (r20, r0, 30)
+ SAVE_REG (r21, r0, 29)
+ SAVE_REG (r22, r0, 28)
+ SAVE_REG (r23, r0, 27)
+ SAVE_REG (r24, r0, 26)
+ SAVE_REG (r25, r0, 25)
+
+ SAVE_REG (blink, r0, 7)
+ SAVE_REG (fp, r0, 8)
+ SAVE_REG (sp, r0, 23)
+
+ /* Save 0 in r0 placeholder to return 0 when @oucp activated. */
+ mov r9, 0
+ SAVE_REG (r9, r0, 22)
+
+ /* Load context from @ucp. */
+
+ mov r9, r1 /* Safekeep @ucp across syscall. */
+
+ /* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */
+ mov r3, _NSIG8
+ add r2, r0, UCONTEXT_SIGMASK
+ add r1, r1, UCONTEXT_SIGMASK
+ mov r0, SIG_SETMASK
+ mov r8, __NR_rt_sigprocmask
+ ARC_TRAP_INSN
+ brhi r0, -1024, .Lcall_syscall_err
+
+ LOAD_REG (r0, r9, 22)
+ LOAD_REG (r1, r9, 21)
+ LOAD_REG (r2, r9, 20)
+ LOAD_REG (r3, r9, 19)
+ LOAD_REG (r4, r9, 18)
+ LOAD_REG (r5, r9, 17)
+ LOAD_REG (r6, r9, 16)
+ LOAD_REG (r7, r9, 15)
+
+ LOAD_REG (r13, r9, 37)
+ LOAD_REG (r14, r9, 36)
+ LOAD_REG (r15, r9, 35)
+ LOAD_REG (r16, r9, 34)
+ LOAD_REG (r17, r9, 33)
+ LOAD_REG (r18, r9, 32)
+ LOAD_REG (r19, r9, 31)
+ LOAD_REG (r20, r9, 30)
+ LOAD_REG (r21, r9, 29)
+ LOAD_REG (r22, r9, 28)
+ LOAD_REG (r23, r9, 27)
+ LOAD_REG (r24, r9, 26)
+ LOAD_REG (r25, r9, 25)
+
+ LOAD_REG (blink, r9, 7)
+ LOAD_REG (fp, r9, 8)
+ LOAD_REG (sp, r9, 23)
+
+ j [blink]
+
+PSEUDO_END (__swapcontext)
+weak_alias (__swapcontext, swapcontext)
new file mode 100644
@@ -0,0 +1,36 @@
+/* cacheflush - flush contents of instruction and/or data cache.
+ 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 _SYS_CACHECTL_H
+#define _SYS_CACHECTL_H 1
+
+#include <features.h>
+
+/* Get the kernel definition for the op bits. */
+#include <asm/cachectl.h>
+
+__BEGIN_DECLS
+
+#ifdef __USE_MISC
+extern int cacheflush (void *__addr, const int __nbytes, const int __op) __THROW;
+#endif
+extern int _flush_cache (char *__addr, const int __nbytes, const int __op) __THROW;
+
+__END_DECLS
+
+#endif /* sys/cachectl.h */
new file mode 100644
@@ -0,0 +1,63 @@
+/* struct ucontext definition, 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/>. */
+
+/* System V/ARC ABI compliant context switching support. */
+
+#ifndef _SYS_UCONTEXT_H
+#define _SYS_UCONTEXT_H 1
+
+#include <features.h>
+
+#include <bits/types/sigset_t.h>
+#include <bits/types/stack_t.h>
+
+typedef struct
+ {
+ unsigned long int __pad;
+ struct {
+ unsigned long int __bta;
+ unsigned long int __lp_start, __lp_end, __lp_count;
+ unsigned long int __status32, __ret, __blink;
+ unsigned long int __fp, __gp;
+ unsigned long int __r12, __r11, __r10, __r9, __r8, __r7;
+ unsigned long int __r6, __r5, __r4, __r3, __r2, __r1, __r0;
+ unsigned long int __sp;
+ } __scratch;
+ unsigned long int __pad2;
+ struct {
+ unsigned long int __r25, __r24, __r23, __r22, __r21, __r20;
+ unsigned long int __r19, __r18, __r17, __r16, __r15, __r14, __r13;
+ } __callee;
+ unsigned long int __efa;
+ unsigned long int __stop_pc;
+ unsigned long int __r30, __r58, __r59;
+ } mcontext_t;
+
+/* Userlevel context. */
+typedef struct ucontext_t
+ {
+ unsigned long int __uc_flags;
+ struct ucontext_t *uc_link;
+ stack_t uc_stack;
+ mcontext_t uc_mcontext;
+ sigset_t uc_sigmask;
+ } ucontext_t;
+
+#undef __ctx
+
+#endif /* sys/ucontext.h */
new file mode 100644
@@ -0,0 +1,31 @@
+/* ptrace register data format definitions.
+ Copyright (C) 1998-2020 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 _SYS_USER_H
+#define _SYS_USER_H 1
+
+/* Struct user_regs_struct is exported by kernel header
+ However apps like strace also expect a struct user, so it's better to
+ have a dummy implementation. */
+#include <asm/ptrace.h>
+
+struct user {
+ int dummy;
+};
+
+#endif /* sys/user.h */
new file mode 100644
@@ -0,0 +1,29 @@
+/* Macros for ucontext routines, 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 _LINUX_ARC_UCONTEXT_MACROS_H
+#define _LINUX_ARC_UCONTEXT_MACROS_H
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+#define SAVE_REG(reg, rbase, off) st reg, [rbase, UCONTEXT_MCONTEXT + off * 4]
+#define LOAD_REG(reg, rbase, off) ld reg, [rbase, UCONTEXT_MCONTEXT + off * 4]
+
+#endif
new file mode 100644
@@ -0,0 +1,20 @@
+#include <inttypes.h>
+#include <signal.h>
+#include <stddef.h>
+#include <sys/ucontext.h>
+
+SIG_BLOCK
+SIG_SETMASK
+
+-- sizeof(sigset_t) expected by kernel: see comment in ARC sigaction.c for details
+_NSIG8 (_NSIG / 8)
+
+-- Offsets of the fields in the ucontext_t structure.
+#define ucontext(member) offsetof (ucontext_t, member)
+
+UCONTEXT_FLAGS ucontext (__uc_flags)
+UCONTEXT_LINK ucontext (uc_link)
+UCONTEXT_STACK ucontext (uc_stack)
+UCONTEXT_MCONTEXT ucontext (uc_mcontext)
+UCONTEXT_SIGMASK ucontext (uc_sigmask)
+UCONTEXT_SIZE sizeof (ucontext_t)