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78 lines
2.4 KiB
ArmAsm
78 lines
2.4 KiB
ArmAsm
/* BSD `_setjmp' entry point to `sigsetjmp (..., 0)'. i386 version.
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Copyright (C) 1994-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* This just does a tail-call to `__sigsetjmp (ARG, 0)'.
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We cannot do it in C because it must be a tail-call, so frame-unwinding
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in setjmp doesn't clobber the state restored by longjmp. */
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#include <sysdep.h>
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#include <jmpbuf-offsets.h>
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#include <jmp_buf-ssp.h>
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#include <stap-probe.h>
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#define PARMS 4 /* no space for saved regs */
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#define JMPBUF PARMS
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#define SIGMSK JMPBUF+4
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/* Don't save shadow stack register if shadow stack isn't enabled. */
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#if !SHSTK_ENABLED
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# undef SHADOW_STACK_POINTER_OFFSET
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#endif
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ENTRY (_setjmp)
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xorl %eax, %eax
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movl JMPBUF(%esp), %edx
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/* Save registers. */
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movl %ebx, (JB_BX*4)(%edx)
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movl %esi, (JB_SI*4)(%edx)
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movl %edi, (JB_DI*4)(%edx)
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leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */
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#ifdef PTR_MANGLE
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PTR_MANGLE (%ecx)
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#endif
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movl %ecx, (JB_SP*4)(%edx)
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movl 0(%esp), %ecx /* Save PC we are returning to now. */
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LIBC_PROBE (setjmp, 3, 4@%edx, -4@$0, 4@%ecx)
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#ifdef PTR_MANGLE
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PTR_MANGLE (%ecx)
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#endif
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movl %ecx, (JB_PC*4)(%edx)
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movl %ebp, (JB_BP*4)(%edx) /* Save caller's frame pointer. */
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movl %eax, JB_SIZE(%edx) /* No signal mask set. */
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#ifdef SHADOW_STACK_POINTER_OFFSET
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# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
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/* Check if Shadow Stack is enabled. */
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testl $X86_FEATURE_1_SHSTK, %gs:FEATURE_1_OFFSET
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jz L(skip_ssp)
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# else
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xorl %ecx, %ecx
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# endif
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/* Get the current Shadow-Stack-Pointer and save it. */
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rdsspd %ecx
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movl %ecx, SHADOW_STACK_POINTER_OFFSET(%edx)
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# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
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L(skip_ssp):
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# endif
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#endif
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ret
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END (_setjmp)
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libc_hidden_def (_setjmp)
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