mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 06:50:07 +00:00
110 lines
3.2 KiB
ArmAsm
110 lines
3.2 KiB
ArmAsm
/* Copyright (C) 2001-2012 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 <signal-defines.h>
|
|
/* #include <signal.h> */
|
|
#define SS_ONSTACK 1
|
|
|
|
|
|
.section .rodata.str1.1,"aMS",@progbits,1
|
|
.type longjmp_msg,@object
|
|
longjmp_msg:
|
|
.string "longjmp causes uninitialized stack frame"
|
|
.size longjmp_msg, .-longjmp_msg
|
|
|
|
|
|
#ifdef PIC
|
|
# define CALL_FAIL movl %ebx, %ecx; /* TODO: what's this mov good for? */ \
|
|
cfi_register(%ebx,%ecx); \
|
|
LOAD_PIC_REG (bx); \
|
|
leal longjmp_msg@GOTOFF(%ebx), %eax; \
|
|
call HIDDEN_JUMPTARGET(__fortify_fail)
|
|
#else
|
|
# define CALL_FAIL movl $longjmp_msg, %eax; \
|
|
call HIDDEN_JUMPTARGET(__fortify_fail)
|
|
#endif
|
|
|
|
|
|
.text
|
|
ENTRY (____longjmp_chk)
|
|
movl 4(%esp), %ecx /* User's jmp_buf in %ecx. */
|
|
|
|
/* Save the return address now. */
|
|
movl (JB_PC*4)(%ecx), %edx
|
|
/* Get the stack pointer. */
|
|
movl (JB_SP*4)(%ecx), %edi
|
|
cfi_undefined(%edi)
|
|
#ifdef PTR_DEMANGLE
|
|
PTR_DEMANGLE (%edx)
|
|
PTR_DEMANGLE (%edi)
|
|
#endif
|
|
|
|
cmpl %edi, %esp
|
|
/* Jumping to a higher-address frame is always allowed. */
|
|
jbe .Lok
|
|
|
|
/* Passing here, we're either about to do something invalid, or we're
|
|
executing on an alternative signal stack. */
|
|
|
|
/* TODO: need locking? */
|
|
/* struct hurd_sigstate * _hurd_self_sigstate (void) */
|
|
call _hurd_self_sigstate
|
|
/* TODO: %eax and %eax->sigaltstack are always valid? */
|
|
|
|
testl $SS_ONSTACK, (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_FLAGS__OFFSET)(%eax)
|
|
/* Fail if SS_ONSTACK is not set. */
|
|
jz .Lfail
|
|
|
|
movl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SP__OFFSET)(%eax), %ebx
|
|
addl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SIZE__OFFSET)(%eax), %ebx
|
|
subl %edi, %ebx
|
|
cmpl (HURD_SIGSTATE__SIGALTSTACK__OFFSET + SIGALTSTACK__SS_SIZE__OFFSET)(%eax), %ebx
|
|
/* TODO: comment this calculation. */
|
|
jae .Lok
|
|
|
|
.Lfail: CALL_FAIL
|
|
|
|
.Lok: /* We add unwind information for the target here. */
|
|
cfi_def_cfa(%ecx, 0)
|
|
cfi_register(%eip, %edx)
|
|
cfi_register(%esp, %edi)
|
|
cfi_offset(%ebx, JB_BX*4)
|
|
cfi_offset(%esi, JB_SI*4)
|
|
cfi_offset(%edi, JB_DI*4)
|
|
cfi_offset(%ebp, JB_BP*4)
|
|
|
|
movl 8(%esp), %eax /* Second argument is return value. */
|
|
movl %edi, %esp
|
|
|
|
/* Restore registers. */
|
|
movl (JB_BX*4)(%ecx), %ebx
|
|
movl (JB_SI*4)(%ecx), %esi
|
|
movl (JB_DI*4)(%ecx), %edi
|
|
movl (JB_BP*4)(%ecx), %ebp
|
|
cfi_restore(%ebx)
|
|
cfi_restore(%esi)
|
|
cfi_restore(%edi)
|
|
cfi_restore(%ebp)
|
|
|
|
/* Jump to saved PC. */
|
|
jmp *%edx
|
|
END (____longjmp_chk)
|