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/* Copyright (C) 2001,2004,2005,2006,2009 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 leaq longjmp_msg(%rip), %rdi; \
call __GI___fortify_fail
#else
# define CALL_FAIL movq $longjmp_msg, %rdi; \
call __fortify_fail
#endif
#define CHECK_RSP(reg) \
cmpq reg, %rsp; \
jbe .Lok; \
CALL_FAIL; \
.Lok:
/* 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
/* Save function parameters. */
movq %rdi, %r10
movl %esi, %ecx
xorl %eax, %eax
cmpq %r8, %rsp
jbe .Lok
subq $32, %rsp
cfi_adjust_cfa_offset(32)
movq %r10, 24(%rsp)
xorl %edi, %edi
movq %rsp, %rsi
movl $__NR_sigaltstack, %eax
syscall
movq 24(%rsp), %r10
testl %eax, %eax
movl $0, %eax
jne .Lok
movl 8(%rsp), %eax
andl $1, %eax
.Lok:
/* We add unwind information for the target here. */
cfi_def_cfa(%r10, 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)
xchgq %r8, %rsp
cfi_restore(%rsp)
xchgq %r9, %rbp
cfi_restore(%rbp)
movq (JB_RBX*8)(%r10),%rbx
movq (JB_R12*8)(%r10),%r12
movq (JB_R13*8)(%r10),%r13
movq (JB_R14*8)(%r10),%r14
movq (JB_R15*8)(%r10),%r15
cmpq %rsp, %r8
jnbe .Lcheck
/* Set return value for setjmp. */
.Lout: movl %ecx, %eax
jmpq *%rdx
.Lcheck:
testl %eax, %eax
je .Lfail
subq $24, %rsp
cfi_adjust_cfa_offset(24)
xorl %edi, %edi
movq %rsp, %rsi
movl $__NR_sigaltstack, %eax
syscall
addq $24, %rsp
cfi_adjust_cfa_offset(-24)
testl $1, 8(%rsp)
je .Lout
.Lfail: xchgq %r8, %rsp
/* We want the stack trace to show that of the caller. */
cfi_def_cfa(%rsp, 40)
cfi_restore(%rsp)
cfi_register(%rbp, %r9)
cfi_restore(%rip)
cfi_restore(%rbx)
cfi_restore(%r12)
cfi_restore(%r13)
cfi_restore(%r14)
cfi_restore(%r15)
xchgq %r9, %rbp
cfi_restore(%rbp)
CALL_FAIL
hlt
END (BP_SYM (____longjmp_chk))
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