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e1e7db0e9b
For ia64, if the longjmp is crossing a signal-frame, install the new signal mask by updating the sc_mask member in the oldest signal-frame. (Logical change 1.259)
139 lines
3.8 KiB
C
139 lines
3.8 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2003 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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#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 "tdep.h"
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#include "jmpbuf.h"
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#if UNW_TARGET_IA64
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# include "ia64/rse.h"
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#endif
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void
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siglongjmp (sigjmp_buf env, int val)
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{
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unw_word_t *wp = (unw_word_t *) env;
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extern int _UI_siglongjmp_cont;
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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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int *cont;
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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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if (sp != wp[JB_SP])
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continue;
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#if UNW_TARGET_IA64
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{
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unw_word_t bsp, pfs, sol;
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if (unw_get_reg (&c, UNW_IA64_BSP, &bsp) < 0
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|| unw_get_reg (&c, UNW_IA64_AR_PFS, &pfs) < 0)
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abort ();
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/* simulate the effect of "br.call sigsetjmp" on ar.bsp: */
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sol = (pfs >> 7) & 0x7f;
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bsp = ia64_rse_skip_regs (bsp, sol);
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if (bsp != wp[JB_BSP])
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continue;
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}
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#endif
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/* found the right frame: */
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assert (UNW_NUM_EH_REGS >= 4 && _NSIG <= 16 * sizeof (unw_word_t));
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/* default to continuation without sigprocmask() */
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cont = &_UI_longjmp_cont;
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#if UNW_TARGET_IA64
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/* On ia64 we cannot call sigprocmask() at _UI_siglongjmp_cont()
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because the signal may have switched stacks and the old
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stack's register-backing store may have overflown, leaving us
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no space to allocate the stacked registers needed to call
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sigprocmask(). Fortunately, we can just let unw_resume()
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(via sigreturn) take care of restoring the signal-mask.
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That's faster anyhow.
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XXX We probably should do the analogous on all architectures. */
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if (((struct cursor *) &c)->sigcontext_addr)
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{
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/* let unw_resume() install the desired signal mask */
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struct cursor *cp = (struct cursor *) &c;
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struct sigcontext *sc = (struct sigcontext *) cp->sigcontext_addr;
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sigset_t current_mask;
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void *mp;
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if (wp[JB_MASK_SAVED])
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mp = &wp[JB_MASK];
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else
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{
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if (sigprocmask (SIG_BLOCK, NULL, ¤t_mask) < 0)
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abort ();
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mp = ¤t_mask;
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}
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memcpy (&sc->sc_mask, mp, sizeof (sc->sc_mask));
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}
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else
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#endif
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if (wp[JB_MASK_SAVED])
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{
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/* sigmask was saved */
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if (unw_set_reg (&c, UNW_REG_EH + 2, wp[JB_MASK]) < 0
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|| (_NSIG > 8 * sizeof (unw_word_t)
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&& unw_set_reg (&c, UNW_REG_EH + 3, wp[JB_MASK + 1]) < 0))
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abort ();
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cont = &_UI_siglongjmp_cont;
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}
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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, (unw_word_t) 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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