mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-13 23:00:22 +00:00
102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/* Copyright (C) 2003, 2005, 2010 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Jakub Jelinek <jakub@redhat.com>.
|
|
|
|
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 <dlfcn.h>
|
|
#include <stdio.h>
|
|
#include <unwind.h>
|
|
|
|
static void (*libgcc_s_resume) (struct _Unwind_Exception *exc);
|
|
static _Unwind_Reason_Code (*libgcc_s_personality)
|
|
(_Unwind_State, struct _Unwind_Exception *, struct _Unwind_Context *);
|
|
|
|
static void init (void) __attribute_used__;
|
|
|
|
static void
|
|
init (void)
|
|
{
|
|
void *resume, *personality;
|
|
void *handle;
|
|
|
|
handle = __libc_dlopen ("libgcc_s.so.1");
|
|
|
|
if (handle == NULL
|
|
|| (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
|
|
|| (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL)
|
|
__libc_fatal ("libgcc_s.so.1 must be installed for pthread_cancel to work\n");
|
|
|
|
libgcc_s_resume = resume;
|
|
libgcc_s_personality = personality;
|
|
}
|
|
|
|
/* It's vitally important that _Unwind_Resume not have a stack frame; the
|
|
ARM unwinder relies on register state at entrance. So we write this in
|
|
assembly. */
|
|
|
|
asm (
|
|
" .globl _Unwind_Resume\n"
|
|
" .type _Unwind_Resume, %function\n"
|
|
"_Unwind_Resume:\n"
|
|
" .cfi_sections .debug_frame\n"
|
|
" " CFI_STARTPROC "\n"
|
|
" stmfd sp!, {r4, r5, r6, lr}\n"
|
|
" " CFI_ADJUST_CFA_OFFSET (16)" \n"
|
|
" " CFI_REL_OFFSET (r4, 0) "\n"
|
|
" " CFI_REL_OFFSET (r5, 4) "\n"
|
|
" " CFI_REL_OFFSET (r6, 8) "\n"
|
|
" " CFI_REL_OFFSET (lr, 12) "\n"
|
|
" " CFI_REMEMBER_STATE "\n"
|
|
" ldr r4, 1f\n"
|
|
" ldr r5, 2f\n"
|
|
"3: add r4, pc, r4\n"
|
|
" ldr r3, [r4, r5]\n"
|
|
" mov r6, r0\n"
|
|
" cmp r3, #0\n"
|
|
" beq 4f\n"
|
|
"5: mov r0, r6\n"
|
|
" ldmfd sp!, {r4, r5, r6, lr}\n"
|
|
" " CFI_ADJUST_CFA_OFFSET (-16) "\n"
|
|
" " CFI_RESTORE (r4) "\n"
|
|
" " CFI_RESTORE (r5) "\n"
|
|
" " CFI_RESTORE (r6) "\n"
|
|
" " CFI_RESTORE (lr) "\n"
|
|
" bx r3\n"
|
|
" " CFI_RESTORE_STATE "\n"
|
|
"4: bl init\n"
|
|
" ldr r3, [r4, r5]\n"
|
|
" b 5b\n"
|
|
" " CFI_ENDPROC "\n"
|
|
" .align 2\n"
|
|
#ifdef __thumb2__
|
|
"1: .word _GLOBAL_OFFSET_TABLE_ - 3b - 4\n"
|
|
#else
|
|
"1: .word _GLOBAL_OFFSET_TABLE_ - 3b - 8\n"
|
|
#endif
|
|
"2: .word libgcc_s_resume(GOTOFF)\n"
|
|
" .size _Unwind_Resume, .-_Unwind_Resume\n"
|
|
);
|
|
|
|
_Unwind_Reason_Code
|
|
__gcc_personality_v0 (_Unwind_State state,
|
|
struct _Unwind_Exception *ue_header,
|
|
struct _Unwind_Context *context)
|
|
{
|
|
if (__builtin_expect (libgcc_s_personality == NULL, 0))
|
|
init ();
|
|
return libgcc_s_personality (state, ue_header, context);
|
|
}
|