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glibc/nptl/unwind.c
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/* Copyright (C) 2003-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@redhat.com> | |
and Richard Henderson <rth@redhat.com>, 2003. | |
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 <setjmp.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <unistd.h> | |
#include "pthreadP.h" | |
#include <jmpbuf-unwind.h> | |
#ifdef _STACK_GROWS_DOWN | |
# define FRAME_LEFT(frame, other, adj) \ | |
((uintptr_t) frame - adj >= (uintptr_t) other - adj) | |
#elif _STACK_GROWS_UP | |
# define FRAME_LEFT(frame, other, adj) \ | |
((uintptr_t) frame - adj <= (uintptr_t) other - adj) | |
#else | |
# error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP" | |
#endif | |
static _Unwind_Reason_Code | |
unwind_stop (int version, _Unwind_Action actions, | |
_Unwind_Exception_Class exc_class, | |
struct _Unwind_Exception *exc_obj, | |
struct _Unwind_Context *context, void *stop_parameter) | |
{ | |
struct pthread_unwind_buf *buf = stop_parameter; | |
struct pthread *self = THREAD_SELF; | |
struct _pthread_cleanup_buffer *curp = THREAD_GETMEM (self, cleanup); | |
int do_longjump = 0; | |
/* Adjust all pointers used in comparisons, so that top of thread's | |
stack is at the top of address space. Without that, things break | |
if stack is allocated above the main stack. */ | |
uintptr_t adj = (uintptr_t) self->stackblock + self->stackblock_size; | |
/* Do longjmp if we're at "end of stack", aka "end of unwind data". | |
We assume there are only C frame without unwind data in between | |
here and the jmp_buf target. Otherwise simply note that the CFA | |
of a function is NOT within it's stack frame; it's the SP of the | |
previous frame. */ | |
if ((actions & _UA_END_OF_STACK) | |
|| ! _JMPBUF_CFA_UNWINDS_ADJ (buf->cancel_jmp_buf[0].jmp_buf, context, | |
adj)) | |
do_longjump = 1; | |
if (__glibc_unlikely (curp != NULL)) | |
{ | |
/* Handle the compatibility stuff. Execute all handlers | |
registered with the old method which would be unwound by this | |
step. */ | |
struct _pthread_cleanup_buffer *oldp = buf->priv.data.cleanup; | |
void *cfa = (void *) (_Unwind_Ptr) _Unwind_GetCFA (context); | |
if (curp != oldp && (do_longjump || FRAME_LEFT (cfa, curp, adj))) | |
{ | |
do | |
{ | |
/* Pointer to the next element. */ | |
struct _pthread_cleanup_buffer *nextp = curp->__prev; | |
/* Call the handler. */ | |
curp->__routine (curp->__arg); | |
/* To the next. */ | |
curp = nextp; | |
} | |
while (curp != oldp | |
&& (do_longjump || FRAME_LEFT (cfa, curp, adj))); | |
/* Mark the current element as handled. */ | |
THREAD_SETMEM (self, cleanup, curp); | |
} | |
} | |
if (do_longjump) | |
__libc_unwind_longjmp ((struct __jmp_buf_tag *) buf->cancel_jmp_buf, 1); | |
return _URC_NO_REASON; | |
} | |
static void | |
unwind_cleanup (_Unwind_Reason_Code reason, struct _Unwind_Exception *exc) | |
{ | |
/* When we get here a C++ catch block didn't rethrow the object. We | |
cannot handle this case and therefore abort. */ | |
__libc_fatal ("FATAL: exception not rethrown\n"); | |
} | |
void | |
__cleanup_fct_attribute __attribute ((noreturn)) | |
__pthread_unwind (__pthread_unwind_buf_t *buf) | |
{ | |
struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf; | |
struct pthread *self = THREAD_SELF; | |
/* This is not a catchable exception, so don't provide any details about | |
the exception type. We do need to initialize the field though. */ | |
THREAD_SETMEM (self, exc.exception_class, 0); | |
THREAD_SETMEM (self, exc.exception_cleanup, &unwind_cleanup); | |
_Unwind_ForcedUnwind (&self->exc, unwind_stop, ibuf); | |
/* NOTREACHED */ | |
/* We better do not get here. */ | |
abort (); | |
} | |
hidden_def (__pthread_unwind) | |
void | |
__cleanup_fct_attribute __attribute ((noreturn)) | |
__pthread_unwind_next (__pthread_unwind_buf_t *buf) | |
{ | |
struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf; | |
__pthread_unwind ((__pthread_unwind_buf_t *) ibuf->priv.data.prev); | |
} | |
hidden_def (__pthread_unwind_next) |