mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-09-20 21:02:51 +02:00
c84005e9c8
Rearrange the code to put the slow branch out of main body, and pinch the fixed amount of stack space to be able to annotate the code.
112 lines
3.6 KiB
ArmAsm
112 lines
3.6 KiB
ArmAsm
/* libunwind - a platform-independent unwind library
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Copyright (C) 2010 Konstantin Belousov <kib@freebsd.org>
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#include "offsets.h"
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.global _Ux86_getcontext
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.type _Ux86_getcontext, @function
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_Ux86_getcontext:
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.cfi_startproc
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pushl %eax
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.cfi_adjust_cfa_offset 4
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mov 8(%esp),%eax /* ucontext_t* */
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popl FREEBSD_UC_MCONTEXT_EAX_OFF(%eax)
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.cfi_adjust_cfa_offset 4
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movl %ebx, FREEBSD_UC_MCONTEXT_EBX_OFF(%eax)
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movl %ecx, FREEBSD_UC_MCONTEXT_ECX_OFF(%eax)
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movl %edx, FREEBSD_UC_MCONTEXT_EDX_OFF(%eax)
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movl %edi, FREEBSD_UC_MCONTEXT_EDI_OFF(%eax)
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movl %esi, FREEBSD_UC_MCONTEXT_ESI_OFF(%eax)
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movl %ebp, FREEBSD_UC_MCONTEXT_EBP_OFF(%eax)
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movl (%esp), %ecx
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movl %ecx, FREEBSD_UC_MCONTEXT_EIP_OFF(%eax)
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leal 4(%esp), %ecx /* Exclude the return address. */
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movl %ecx, FREEBSD_UC_MCONTEXT_ESP_OFF(%eax)
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xorl %ecx, %ecx
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movw %fs, %cx
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movl %ecx, FREEBSD_UC_MCONTEXT_FS_OFF(%eax)
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movw %gs, %cx
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movl %ecx, FREEBSD_UC_MCONTEXT_GS_OFF(%eax)
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movw %ds, %cx
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movl %ecx, FREEBSD_UC_MCONTEXT_DS_OFF(%eax)
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movw %es, %cx
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movl %ecx, FREEBSD_UC_MCONTEXT_ES_OFF(%eax)
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movw %ss, %cx
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movl %ecx, FREEBSD_UC_MCONTEXT_SS_OFF(%eax)
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movw %cs, %cx
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movl %ecx, FREEBSD_UC_MCONTEXT_CS_OFF(%eax)
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pushfl
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.cfi_adjust_cfa_offset 4
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popl FREEBSD_UC_MCONTEXT_EFLAGS_OFF(%eax)
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.cfi_adjust_cfa_offset -4
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movl $0, FREEBSD_UC_MCONTEXT_TRAPNO_OFF(%eax)
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movl $FREEBSD_UC_MCONTEXT_FPOWNED_FPU,\
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FREEBSD_UC_MCONTEXT_OWNEDFP_OFF(%eax)
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movl $FREEBSD_UC_MCONTEXT_FPFMT_XMM,\
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FREEBSD_UC_MCONTEXT_FPFORMAT_OFF(%eax)
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/*
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* Require CPU with fxsave implemented, and enabled by OS.
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*
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* If passed ucontext is not aligned to 16-byte boundary,
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* save fpu context into temporary aligned location on stack
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* and then copy.
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*/
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leal FREEBSD_UC_MCONTEXT_FPSTATE_OFF(%eax), %edx
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testl $0xf, %edx
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jne 2f
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fxsave (%edx) /* fast path, passed ucontext save area was aligned */
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1: movl $FREEBSD_UC_MCONTEXT_MC_LEN_VAL,\
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FREEBSD_UC_MCONTEXT_MC_LEN_OFF(%eax)
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xorl %eax, %eax
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ret
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2: movl %edx, %edi /* not aligned, do the dance */
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subl $512 + 16, %esp /* save area and 16 bytes for alignment */
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.cfi_adjust_cfa_offset 512 + 16
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movl %esp, %edx
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orl $0xf, %edx /* align *%edx to 16-byte up */
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incl %edx
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fxsave (%edx)
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movl %edx, %esi /* copy to the final destination */
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movl $512/4,%ecx
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rep; movsl
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addl $512 + 16, %esp /* restore the stack */
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.cfi_adjust_cfa_offset -512 - 16
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movl FREEBSD_UC_MCONTEXT_ESI_OFF(%eax), %esi
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movl FREEBSD_UC_MCONTEXT_EDI_OFF(%eax), %edi
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jmp 1b
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.cfi_endproc
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.size _Ux86_getcontext, . - _Ux86_getcontext
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/* We do not need executable stack. */
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.section .note.GNU-stack,"",@progbits
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