| /* Copyright (C) 2003-2014 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. */ |
| |
| #define STR1(S) #S |
| #define STR(S) STR1(S) |
| |
| asm ( |
| " .globl _Unwind_Resume\n" |
| " .type _Unwind_Resume, %function\n" |
| "_Unwind_Resume:\n" |
| " .cfi_sections .debug_frame\n" |
| " " CFI_STARTPROC "\n" |
| " push {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" |
| " pop {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" |
| "1: .word _GLOBAL_OFFSET_TABLE_ - 3b - " STR (PC_OFS) "\n" |
| "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); |
| } |