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83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
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/* Copyright (C) 2003, 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.com>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <dlfcn.h>
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#include <stdio.h>
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#include <unwind.h>
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static void (*libgcc_s_resume) (struct _Unwind_Exception *exc);
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static _Unwind_Reason_Code (*libgcc_s_personality)
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(_Unwind_State, struct _Unwind_Exception *, struct _Unwind_Context *);
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static void init (void) __attribute_used__;
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static void
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init (void)
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{
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void *resume, *personality;
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void *handle;
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handle = __libc_dlopen ("libgcc_s.so.1");
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if (handle == NULL
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|| (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
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|| (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL)
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__libc_fatal ("libgcc_s.so.1 must be installed for pthread_cancel to work\n");
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libgcc_s_resume = resume;
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libgcc_s_personality = personality;
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}
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/* It's vitally important that _Unwind_Resume not have a stack frame; the
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ARM unwinder relies on register state at entrance. So we write this in
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assembly. */
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asm (
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" .globl _Unwind_Resume\n"
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" .type _Unwind_Resume, %function\n"
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"_Unwind_Resume:\n"
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" stmfd sp!, {r4, r5, r6, lr}\n"
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" ldr r4, 1f\n"
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" ldr r5, 2f\n"
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"3: add r4, pc, r4\n"
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" ldr r3, [r4, r5]\n"
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" mov r6, r0\n"
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" cmp r3, #0\n"
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" beq 4f\n"
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"5: mov r0, r6\n"
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" ldmfd sp!, {r4, r5, r6, lr}\n"
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" bx r3\n"
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"4: bl init\n"
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" ldr r3, [r4, r5]\n"
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" b 5b\n"
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"1: .word _GLOBAL_OFFSET_TABLE_ - 3b - 8\n"
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"2: .word libgcc_s_resume(GOTOFF)\n"
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" .size _Unwind_Resume, .-_Unwind_Resume\n"
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);
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_Unwind_Reason_Code
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__gcc_personality_v0 (_Unwind_State state,
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struct _Unwind_Exception *ue_header,
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struct _Unwind_Context *context)
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{
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if (__builtin_expect (libgcc_s_personality == NULL, 0))
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init ();
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return libgcc_s_personality (state, ue_header, context);
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}
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