/* libunwind - a platform-independent unwind library
|
Copyright (C) 2007 Google, Inc
|
Contributed by Arun Sharma <arun.sharma@google.com>
|
Copyright (C) 2010 Konstantin Belousov <kib@freebsd.org>
|
|
This file is part of libunwind.
|
|
Permission is hereby granted, free of charge, to any person obtaining
|
a copy of this software and associated documentation files (the
|
"Software"), to deal in the Software without restriction, including
|
without limitation the rights to use, copy, modify, merge, publish,
|
distribute, sublicense, and/or sell copies of the Software, and to
|
permit persons to whom the Software is furnished to do so, subject to
|
the following conditions:
|
|
The above copyright notice and this permission notice shall be
|
included in all copies or substantial portions of the Software.
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
|
|
#include "ucontext_i.h"
|
#if defined __linux__
|
#include <asm/unistd.h>
|
#define SIG_SETMASK 2
|
#define SIGSET_BYTE_SIZE (64/8)
|
#elif defined __FreeBSD__
|
#include <sys/syscall.h>
|
#endif
|
|
/* int _Ux86_64_setcontext (const ucontext_t *ucp)
|
|
Restores the machine context provided.
|
Unlike the libc implementation, doesn't clobber %rax
|
|
*/
|
.global _Ux86_64_setcontext
|
.type _Ux86_64_setcontext, @function
|
|
_Ux86_64_setcontext:
|
|
#if defined __linux__
|
/* restore signal mask
|
sigprocmask(SIG_SETMASK, ucp->uc_sigmask, NULL, sizeof(sigset_t)) */
|
push %rdi
|
mov $__NR_rt_sigprocmask, %rax
|
lea UC_SIGMASK(%rdi), %rsi
|
mov $SIG_SETMASK, %rdi
|
xor %rdx, %rdx
|
mov $SIGSET_BYTE_SIZE, %r10
|
syscall
|
pop %rdi
|
|
/* restore fp state */
|
mov UC_MCONTEXT_FPREGS_PTR(%rdi),%r8
|
fldenv (%r8)
|
ldmxcsr FPREGS_OFFSET_MXCSR(%r8)
|
#elif defined __FreeBSD__
|
/* restore signal mask */
|
pushq %rdi
|
xorl %edx,%edx
|
leaq UC_SIGMASK(%rdi),%rsi
|
movl $3,%edi/* SIG_SETMASK */
|
movl $SYS_sigprocmask,%eax
|
movq %rcx,%r10
|
syscall
|
popq %rdi
|
|
/* restore fp state */
|
cmpq $UC_MCONTEXT_FPOWNED_FPU,UC_MCONTEXT_OWNEDFP(%rdi)
|
jne 1f
|
cmpq $UC_MCONTEXT_FPFMT_XMM,UC_MCONTEXT_FPFORMAT(%rdi)
|
jne 1f
|
fxrstor UC_MCONTEXT_FPSTATE(%rdi)
|
1:
|
#else
|
#error Port me
|
#endif
|
|
/* restore the rest of the state */
|
mov UC_MCONTEXT_GREGS_R8(%rdi),%r8
|
mov UC_MCONTEXT_GREGS_R9(%rdi),%r9
|
mov UC_MCONTEXT_GREGS_RBX(%rdi),%rbx
|
mov UC_MCONTEXT_GREGS_RBP(%rdi),%rbp
|
mov UC_MCONTEXT_GREGS_R12(%rdi),%r12
|
mov UC_MCONTEXT_GREGS_R13(%rdi),%r13
|
mov UC_MCONTEXT_GREGS_R14(%rdi),%r14
|
mov UC_MCONTEXT_GREGS_R15(%rdi),%r15
|
mov UC_MCONTEXT_GREGS_RSI(%rdi),%rsi
|
mov UC_MCONTEXT_GREGS_RDX(%rdi),%rdx
|
mov UC_MCONTEXT_GREGS_RAX(%rdi),%rax
|
mov UC_MCONTEXT_GREGS_RCX(%rdi),%rcx
|
mov UC_MCONTEXT_GREGS_RSP(%rdi),%rsp
|
|
/* push the return address on the stack */
|
mov UC_MCONTEXT_GREGS_RIP(%rdi),%rcx
|
push %rcx
|
|
mov UC_MCONTEXT_GREGS_RCX(%rdi),%rcx
|
mov UC_MCONTEXT_GREGS_RDI(%rdi),%rdi
|
retq
|
|
.size _Ux86_64_setcontext, . - _Ux86_64_setcontext
|
|
/* We do not need executable stack. */
|
.section .note.GNU-stack,"",@progbits
|
