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- /* libunwind - a platform-independent unwind library
- Copyright (C) 2009 Google, Inc
- Contributed by Paul Pluzhnikov <ppluzhnikov@google.com>
- 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 "offsets.h"
- /* int _Ux86_getcontext (ucontext_t *ucp)
- Saves the machine context in UCP necessary for libunwind.
- Unlike the libc implementation, we don't save the signal mask
- and hence avoid the cost of a system call per unwind.
- */
- .global _Ux86_getcontext
- .type _Ux86_getcontext, @function
- _Ux86_getcontext:
- .cfi_startproc
- mov 4(%esp),%eax /* ucontext_t* */
- /* EAX is not preserved. */
- movl $0, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EAX_OFF)(%eax)
- movl %ebx, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EBX_OFF)(%eax)
- movl %ecx, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_ECX_OFF)(%eax)
- movl %edx, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EDX_OFF)(%eax)
- movl %edi, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EDI_OFF)(%eax)
- movl %esi, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_ESI_OFF)(%eax)
- movl %ebp, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EBP_OFF)(%eax)
- movl (%esp), %ecx
- movl %ecx, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EIP_OFF)(%eax)
- leal 4(%esp), %ecx /* Exclude the return address. */
- movl %ecx, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_ESP_OFF)(%eax)
- /* glibc getcontext saves FS, but not GS */
- xorl %ecx, %ecx
- movw %fs, %cx
- movl %ecx, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_FS_OFF)(%eax)
- leal LINUX_UC_FPREGS_MEM_OFF(%eax), %ecx
- movl %ecx, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_FPSTATE_OFF)(%eax)
- fnstenv (%ecx)
- fldenv (%ecx)
- xor %eax, %eax
- ret
- .cfi_endproc
- .size _Ux86_getcontext, . - _Ux86_getcontext
- /* We do not need executable stack. */
- .section .note.GNU-stack,"",@progbits
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