132 lines
3.6 KiB
ArmAsm
132 lines
3.6 KiB
ArmAsm
/* Copyright (C) 2001-2013 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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
#include <jmpbuf-offsets.h>
|
|
#include <asm-syntax.h>
|
|
#include <stap-probe.h>
|
|
|
|
#include <sigaltstack-offsets.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 sub $8, %RSP_LP; \
|
|
cfi_remember_state; \
|
|
cfi_def_cfa_offset(16); \
|
|
lea longjmp_msg(%rip), %RDI_LP; \
|
|
call HIDDEN_JUMPTARGET(__fortify_fail); \
|
|
nop; \
|
|
cfi_restore_state
|
|
#else
|
|
# define CALL_FAIL sub $8, %RSP_LP; \
|
|
cfi_remember_state; \
|
|
cfi_def_cfa_offset(16); \
|
|
mov $longjmp_msg, %RDI_LP; \
|
|
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. */
|
|
mov (JB_RSP*8)(%rdi), %R8_LP
|
|
mov (JB_RBP*8)(%rdi),%R9_LP
|
|
mov (JB_PC*8)(%rdi), %RDX_LP
|
|
#ifdef PTR_DEMANGLE
|
|
PTR_DEMANGLE (%R8_LP)
|
|
PTR_DEMANGLE (%R9_LP)
|
|
PTR_DEMANGLE (%RDX_LP)
|
|
# ifdef __ILP32__
|
|
/* We ignored the high bits of the %rbp value because only the low
|
|
bits are mangled. But we cannot presume that %rbp is being used
|
|
as a pointer and truncate it, so recover the high bits. */
|
|
movl (JB_RBP*8 + 4)(%rdi), %eax
|
|
shlq $32, %rax
|
|
orq %rax, %r9
|
|
# endif
|
|
#endif
|
|
|
|
cmp %R8_LP, %RSP_LP
|
|
jbe .Lok
|
|
|
|
/* Save function parameters. */
|
|
movq %rdi, %r10
|
|
cfi_register (%rdi, %r10)
|
|
movl %esi, %ebx
|
|
cfi_register (%rsi, %rbx)
|
|
|
|
xorl %edi, %edi
|
|
lea -sizeSS(%rsp), %RSI_LP
|
|
movl $__NR_sigaltstack, %eax
|
|
syscall
|
|
/* Without working sigaltstack we cannot perform the test. */
|
|
testl %eax, %eax
|
|
jne .Lok2
|
|
testl $1, (-sizeSS + oSS_FLAGS)(%rsp)
|
|
jz .Lfail
|
|
|
|
mov (-sizeSS + oSS_SP)(%rsp), %RAX_LP
|
|
add (-sizeSS + oSS_SIZE)(%rsp), %RAX_LP
|
|
sub %R8_LP, %RAX_LP
|
|
cmp (-sizeSS + oSS_SIZE)(%rsp), %RAX_LP
|
|
jae .Lok2
|
|
|
|
.Lfail: CALL_FAIL
|
|
|
|
.Lok2: movq %r10, %rdi
|
|
cfi_restore (%rdi)
|
|
movl %ebx, %esi
|
|
cfi_restore (%rsi)
|
|
|
|
.Lok:
|
|
LIBC_PROBE (longjmp, 3, LP_SIZE@%RDI_LP, -4@%esi, LP_SIZE@%RDX_LP)
|
|
/* 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
|
|
mov %R8_LP, %RSP_LP
|
|
movq %r9,%rbp
|
|
LIBC_PROBE (longjmp_target, 3,
|
|
LP_SIZE@%RDI_LP, -4@%eax, LP_SIZE@%RDX_LP)
|
|
jmpq *%rdx
|
|
END (____longjmp_chk)
|