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/* Copyright (C) 2001,2004,2005,2006,2009,2010,2011 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#include <jmpbuf-offsets.h>
#include <asm-syntax.h>
.section .rodata.str1.1,"aMS",@progbits,1
.type longjmp_msg,@object
longjmp_msg:
.string "longjmp causes uninitialized stack frame"
.size longjmp_msg, .-longjmp_msg
//#define __longjmp ____longjmp_chk
#ifdef PIC
# define CALL_FAIL subq $8, %rsp; \
cfi_remember_state; \
cfi_def_cfa_offset(16); \
leaq longjmp_msg(%rip), %rdi; \
call HIDDEN_JUMPTARGET(__fortify_fail); \
nop; \
cfi_restore_state
#else
# define CALL_FAIL subq $8, %rsp; \
cfi_remember_state; \
cfi_def_cfa_offset(16); \
movq $longjmp_msg, %rdi; \
call HIDDEN_JUMPTARGET(__fortify_fail); \
nop; \
cfi_restore_state
#endif
/* Jump to the position specified by ENV, causing the
setjmp call there to return VAL, or 1 if VAL is 0.
void __longjmp (__jmp_buf env, int val). */
.text
ENTRY(____longjmp_chk)
/* Restore registers. */
movq (JB_RSP*8)(%rdi), %r8
movq (JB_RBP*8)(%rdi), %r9
movq (JB_PC*8)(%rdi), %rdx
#ifdef PTR_DEMANGLE
PTR_DEMANGLE (%r8)
PTR_DEMANGLE (%r9)
PTR_DEMANGLE (%rdx)
#endif
cmpq %r8, %rsp
jbe .Lok
/* Save function parameters. */
movq %rdi, %r10
cfi_register (%rdi, %r10)
movl %esi, %ebx
cfi_register (%rsi, %rbx)
xorl %edi, %edi
leaq -24(%rsp), %rsi
movl $__NR_sigaltstack, %eax
syscall
/* Without working sigaltstack we cannot perform the test. */
testl %eax, %eax
jne .Lok2
testl $1, -16(%rsp)
jz .Lfail
movq -24(%rsp), %rax
addq -8(%rsp), %rax
subq %r8, %rax
cmpq -8(%rsp), %rax
jae .Lok2
.Lfail: CALL_FAIL
.Lok2: movq %r10, %rdi
cfi_restore (%rdi)
movl %ebx, %esi
cfi_restore (%rsi)
.Lok: /* We add unwind information for the target here. */
cfi_def_cfa(%rdi, 0)
cfi_register(%rsp,%r8)
cfi_register(%rbp,%r9)
cfi_register(%rip,%rdx)
cfi_offset(%rbx,JB_RBX*8)
cfi_offset(%r12,JB_R12*8)
cfi_offset(%r13,JB_R13*8)
cfi_offset(%r14,JB_R14*8)
cfi_offset(%r15,JB_R15*8)
movq (JB_RBX*8)(%rdi), %rbx
movq (JB_R12*8)(%rdi), %r12
movq (JB_R13*8)(%rdi), %r13
movq (JB_R14*8)(%rdi), %r14
movq (JB_R15*8)(%rdi), %r15
/* Set return value for setjmp. */
movl %esi, %eax
movq %r8,%rsp
movq %r9,%rbp
jmpq *%rdx
END (____longjmp_chk)
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