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2b606faa21
Commit 297d9cd07d (Fix for failing test-setjmp)
breaks non glibc systems, since __GLIBC_PREREQ is not defined there.
As a consequence, preprocessor aborts with an error.
Trying to hide __GLIBC_PREREQ under #ifdef __GLIBC would require
either code duplication, or moving the longjmp implementation into
the separate file, which is included twice. In fact, I am not sure
in any use of the __GLIBC_PREREQ at the compile time, because the
compiled code can be run on the later version of glibc.
Below is the patch, tested on FreeBSD x86/x86_64 and Scientific Linux 6.1
x86_64. I compile the code always, but keep it in under unused static
symbol. In principle, the code could be optimized out by linker.
[ Minor formatting edits: asharma@fb.com ]
116 lines
3.1 KiB
C
116 lines
3.1 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2003-2004 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#define UNW_LOCAL_ONLY
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#undef _FORTIFY_SOURCE
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#include <assert.h>
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#include <libunwind.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdlib.h>
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#include "jmpbuf.h"
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#include "setjmp_i.h"
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#if defined(__GLIBC__)
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#if __GLIBC_PREREQ(2, 4)
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/* Starting with glibc-2.4, {sig,}setjmp in GLIBC obfuscates the
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register values in jmp_buf by XORing them with a "random"
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canary value.
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This makes it impossible to implement longjmp, as we
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can never match wp[JB_SP], unless we decode the canary first.
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Doing so is possible, but doesn't appear to be worth the trouble,
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so we simply defer to glibc longjmp here. */
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#define _longjmp __nonworking__longjmp
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#define longjmp __nonworking_longjmp
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static void _longjmp (jmp_buf env, int val);
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static void longjmp (jmp_buf env, int val);
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#endif
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#endif /* __GLIBC__ */
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void
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_longjmp (jmp_buf env, int val)
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{
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extern int _UI_longjmp_cont;
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unw_context_t uc;
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unw_cursor_t c;
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unw_word_t sp;
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unw_word_t *wp = (unw_word_t *) env;
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if (unw_getcontext (&uc) < 0 || unw_init_local (&c, &uc) < 0)
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abort ();
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do
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{
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if (unw_get_reg (&c, UNW_REG_SP, &sp) < 0)
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abort ();
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#ifdef __FreeBSD__
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if (sp != wp[JB_SP] + sizeof(unw_word_t))
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#else
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if (sp != wp[JB_SP])
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#endif
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continue;
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if (!bsp_match (&c, wp))
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continue;
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/* found the right frame: */
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assert (UNW_NUM_EH_REGS >= 2);
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if (unw_set_reg (&c, UNW_REG_EH + 0, wp[JB_RP]) < 0
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|| unw_set_reg (&c, UNW_REG_EH + 1, val) < 0
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|| unw_set_reg (&c, UNW_REG_IP,
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(unw_word_t) (uintptr_t) &_UI_longjmp_cont))
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abort ();
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unw_resume (&c);
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abort ();
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}
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while (unw_step (&c) > 0);
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abort ();
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}
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#ifdef __GNUC__
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#define STRINGIFY1(x) #x
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#define STRINGIFY(x) STRINGIFY1(x)
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void longjmp (jmp_buf env, int val)
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__attribute__ ((alias (STRINGIFY(_longjmp))));
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#else
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void
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longjmp (jmp_buf env, int val)
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{
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_longjmp (env, val);
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}
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#endif /* __GNUC__ */
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