157 lines
5.0 KiB
C
157 lines
5.0 KiB
C
/* Darwin/powerpc host-specific hook definitions.
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Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 2, or (at your
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option) any later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the
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Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include <signal.h>
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#include <sys/ucontext.h>
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#include "hosthooks.h"
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#include "hosthooks-def.h"
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#include "toplev.h"
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#include "diagnostic.h"
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#include "config/host-darwin.h"
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static void segv_crash_handler (int);
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static void segv_handler (int, siginfo_t *, void *);
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static void darwin_rs6000_extra_signals (void);
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#ifndef HAVE_DECL_SIGALTSTACK
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/* This doesn't have a prototype in signal.h in 10.2.x and earlier,
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fixed in later releases. */
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extern int sigaltstack(const struct sigaltstack *, struct sigaltstack *);
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#endif
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/* The fields of the mcontext_t type have acquired underscores in later
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OS versions. */
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#ifdef HAS_MCONTEXT_T_UNDERSCORES
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#define MC_FLD(x) __ ## x
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#else
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#define MC_FLD(x) x
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#endif
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#undef HOST_HOOKS_EXTRA_SIGNALS
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#define HOST_HOOKS_EXTRA_SIGNALS darwin_rs6000_extra_signals
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/* On Darwin/powerpc, hitting the stack limit turns into a SIGSEGV.
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This code detects the difference between hitting the stack limit and
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a true wild pointer dereference by looking at the instruction that
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faulted; only a few kinds of instruction are used to access below
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the previous bottom of the stack. */
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static void
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segv_crash_handler (int sig ATTRIBUTE_UNUSED)
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{
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internal_error ("Segmentation Fault (code)");
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}
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static void
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segv_handler (int sig ATTRIBUTE_UNUSED,
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siginfo_t *sip ATTRIBUTE_UNUSED,
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void *scp)
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{
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ucontext_t *uc = (ucontext_t *)scp;
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sigset_t sigset;
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unsigned faulting_insn;
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/* The fault might have happened when trying to run some instruction, in
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which case the next line will segfault _again_. Handle this case. */
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signal (SIGSEGV, segv_crash_handler);
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sigemptyset (&sigset);
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sigaddset (&sigset, SIGSEGV);
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sigprocmask (SIG_UNBLOCK, &sigset, NULL);
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faulting_insn = *(unsigned *)uc->uc_mcontext->MC_FLD(ss).MC_FLD(srr0);
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/* Note that this only has to work for GCC, so we don't have to deal
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with all the possible cases (GCC has no AltiVec code, for
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instance). It's complicated because Darwin allows stores to
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below the stack pointer, and the prologue code takes advantage of
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this. */
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if ((faulting_insn & 0xFFFF8000) == 0x94218000 /* stwu %r1, -xxx(%r1) */
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|| (faulting_insn & 0xFC1F03FF) == 0x7C01016E /* stwux xxx, %r1, xxx */
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|| (faulting_insn & 0xFC1F8000) == 0x90018000 /* stw xxx, -yyy(%r1) */
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|| (faulting_insn & 0xFC1F8000) == 0xD8018000 /* stfd xxx, -yyy(%r1) */
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|| (faulting_insn & 0xFC1F8000) == 0xBC018000 /* stmw xxx, -yyy(%r1) */)
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{
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char *shell_name;
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fnotice (stderr, "Out of stack space.\n");
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shell_name = getenv ("SHELL");
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if (shell_name != NULL)
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shell_name = strrchr (shell_name, '/');
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if (shell_name != NULL)
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{
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static const char * shell_commands[][2] = {
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{ "sh", "ulimit -S -s unlimited" },
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{ "bash", "ulimit -S -s unlimited" },
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{ "tcsh", "limit stacksize unlimited" },
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{ "csh", "limit stacksize unlimited" },
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/* zsh doesn't have "unlimited", this will work under the
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default configuration. */
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{ "zsh", "limit stacksize 32m" }
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};
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size_t i;
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for (i = 0; i < ARRAY_SIZE (shell_commands); i++)
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if (strcmp (shell_commands[i][0], shell_name + 1) == 0)
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{
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fnotice (stderr,
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"Try running '%s' in the shell to raise its limit.\n",
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shell_commands[i][1]);
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}
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}
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if (global_dc->abort_on_error)
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fancy_abort (__FILE__, __LINE__, __FUNCTION__);
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exit (FATAL_EXIT_CODE);
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}
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fprintf (stderr, "[address=%08lx pc=%08x]\n",
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uc->uc_mcontext->MC_FLD(es).MC_FLD(dar),
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uc->uc_mcontext->MC_FLD(ss).MC_FLD(srr0));
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internal_error ("Segmentation Fault");
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exit (FATAL_EXIT_CODE);
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}
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static void
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darwin_rs6000_extra_signals (void)
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{
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struct sigaction sact;
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stack_t sigstk;
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sigstk.ss_sp = xmalloc (SIGSTKSZ);
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sigstk.ss_size = SIGSTKSZ;
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sigstk.ss_flags = 0;
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if (sigaltstack (&sigstk, NULL) < 0)
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fatal_error ("While setting up signal stack: %m");
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sigemptyset(&sact.sa_mask);
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sact.sa_flags = SA_ONSTACK | SA_SIGINFO;
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sact.sa_sigaction = segv_handler;
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if (sigaction (SIGSEGV, &sact, 0) < 0)
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fatal_error ("While setting up signal handler: %m");
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}
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const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;
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