1/* Darwin/powerpc host-specific hook definitions.
| 1/* Darwin/powerpc host-specific hook definitions.
|
2 Copyright (C) 2003 Free Software Foundation, Inc.
| 2 Copyright (C) 2003, 2004 Free Software Foundation, Inc.
|
3
4 This file is part of GCC.
5
6 GCC is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published
8 by the Free Software Foundation; either version 2, or (at your
9 option) any later version.
10
11 GCC is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
14 License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING. If not, write to the
18 Free Software Foundation, 59 Temple Place - Suite 330, Boston,
19 MA 02111-1307, USA. */
20
21#include "config.h"
22#include "system.h"
23#include "coretypes.h"
24#include <signal.h>
25#include <sys/ucontext.h>
26#include <sys/mman.h>
27#include "hosthooks.h"
28#include "hosthooks-def.h"
29#include "toplev.h"
30#include "diagnostic.h"
31
32static void segv_crash_handler (int);
33static void segv_handler (int, siginfo_t *, void *);
34static void darwin_rs6000_extra_signals (void);
35
36/* This doesn't have a prototype in signal.h in 10.2.x and earlier,
37 fixed in later releases. */
38extern int sigaltstack(const struct sigaltstack *, struct sigaltstack *);
39
40#undef HOST_HOOKS_EXTRA_SIGNALS
41#define HOST_HOOKS_EXTRA_SIGNALS darwin_rs6000_extra_signals
42
43/* On Darwin/powerpc, hitting the stack limit turns into a SIGSEGV.
44 This code detects the difference between hitting the stack limit and
45 a true wild pointer dereference by looking at the instruction that
46 faulted; only a few kinds of instruction are used to access below
47 the previous bottom of the stack. */
48
49static void
50segv_crash_handler (int sig ATTRIBUTE_UNUSED)
51{
52 internal_error ("Segmentation Fault (code)");
53}
54
55static void
56segv_handler (int sig ATTRIBUTE_UNUSED,
57 siginfo_t *sip ATTRIBUTE_UNUSED,
58 void *scp)
59{
60 ucontext_t *uc = (ucontext_t *)scp;
61 unsigned faulting_insn;
62
63 /* The fault might have happened when trying to run some instruction, in
64 which case the next line will segfault _again_. Handle this case. */
65 signal (SIGSEGV, segv_crash_handler);
66
67 faulting_insn = *(unsigned *)uc->uc_mcontext->ss.srr0;
68
69 /* Note that this only has to work for GCC, so we don't have to deal
70 with all the possible cases (GCC has no AltiVec code, for
71 instance). It's complicated because Darwin allows stores to
72 below the stack pointer, and the prologue code takes advantage of
73 this. */
74
75 if ((faulting_insn & 0xFFFF8000) == 0x94218000 /* stwu %r1, -xxx(%r1) */
76 || (faulting_insn & 0xFFFF03FF) == 0x7C21016E /* stwux %r1, xxx, %r1 */
77 || (faulting_insn & 0xFC1F8000) == 0x90018000 /* stw xxx, -yyy(%r1) */
78 || (faulting_insn & 0xFC1F8000) == 0xD8018000 /* stfd xxx, -yyy(%r1) */
79 || (faulting_insn & 0xFC1F8000) == 0xBC018000 /* stmw xxx, -yyy(%r1) */)
80 {
81 char *shell_name;
82
83 fnotice (stderr, "Out of stack space.\n");
84 shell_name = getenv ("SHELL");
85 if (shell_name != NULL)
86 shell_name = strrchr (shell_name, '/');
87 if (shell_name != NULL)
88 {
89 static const char * shell_commands[][2] = {
90 { "sh", "ulimit -S -s unlimited" },
91 { "bash", "ulimit -S -s unlimited" },
92 { "tcsh", "limit stacksize unlimited" },
93 { "csh", "limit stacksize unlimited" },
94 /* zsh doesn't have "unlimited", this will work under the
95 default configuration. */
96 { "zsh", "limit stacksize 32m" }
97 };
98 size_t i;
99
100 for (i = 0; i < ARRAY_SIZE (shell_commands); i++)
101 if (strcmp (shell_commands[i][0], shell_name + 1) == 0)
102 {
103 fnotice (stderr,
104 "Try running `%s' in the shell to raise its limit.\n",
105 shell_commands[i][1]);
106 }
107 }
108
109 if (global_dc->abort_on_error)
110 abort ();
111
112 exit (FATAL_EXIT_CODE);
113 }
114
115 fprintf (stderr, "[address=%08lx pc=%08x]\n",
116 uc->uc_mcontext->es.dar, uc->uc_mcontext->ss.srr0);
117 internal_error ("Segmentation Fault");
118 exit (FATAL_EXIT_CODE);
119}
120
121static void
122darwin_rs6000_extra_signals (void)
123{
124 struct sigaction sact;
125 stack_t sigstk;
126
127 sigstk.ss_sp = xmalloc (SIGSTKSZ);
128 sigstk.ss_size = SIGSTKSZ;
129 sigstk.ss_flags = 0;
130 if (sigaltstack (&sigstk, NULL) < 0)
131 fatal_error ("While setting up signal stack: %m");
132
133 sigemptyset(&sact.sa_mask);
134 sact.sa_flags = SA_ONSTACK | SA_SIGINFO;
135 sact.sa_sigaction = segv_handler;
136 if (sigaction (SIGSEGV, &sact, 0) < 0)
137 fatal_error ("While setting up signal handler: %m");
138}
139
| 3
4 This file is part of GCC.
5
6 GCC is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published
8 by the Free Software Foundation; either version 2, or (at your
9 option) any later version.
10
11 GCC is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
14 License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING. If not, write to the
18 Free Software Foundation, 59 Temple Place - Suite 330, Boston,
19 MA 02111-1307, USA. */
20
21#include "config.h"
22#include "system.h"
23#include "coretypes.h"
24#include <signal.h>
25#include <sys/ucontext.h>
26#include <sys/mman.h>
27#include "hosthooks.h"
28#include "hosthooks-def.h"
29#include "toplev.h"
30#include "diagnostic.h"
31
32static void segv_crash_handler (int);
33static void segv_handler (int, siginfo_t *, void *);
34static void darwin_rs6000_extra_signals (void);
35
36/* This doesn't have a prototype in signal.h in 10.2.x and earlier,
37 fixed in later releases. */
38extern int sigaltstack(const struct sigaltstack *, struct sigaltstack *);
39
40#undef HOST_HOOKS_EXTRA_SIGNALS
41#define HOST_HOOKS_EXTRA_SIGNALS darwin_rs6000_extra_signals
42
43/* On Darwin/powerpc, hitting the stack limit turns into a SIGSEGV.
44 This code detects the difference between hitting the stack limit and
45 a true wild pointer dereference by looking at the instruction that
46 faulted; only a few kinds of instruction are used to access below
47 the previous bottom of the stack. */
48
49static void
50segv_crash_handler (int sig ATTRIBUTE_UNUSED)
51{
52 internal_error ("Segmentation Fault (code)");
53}
54
55static void
56segv_handler (int sig ATTRIBUTE_UNUSED,
57 siginfo_t *sip ATTRIBUTE_UNUSED,
58 void *scp)
59{
60 ucontext_t *uc = (ucontext_t *)scp;
61 unsigned faulting_insn;
62
63 /* The fault might have happened when trying to run some instruction, in
64 which case the next line will segfault _again_. Handle this case. */
65 signal (SIGSEGV, segv_crash_handler);
66
67 faulting_insn = *(unsigned *)uc->uc_mcontext->ss.srr0;
68
69 /* Note that this only has to work for GCC, so we don't have to deal
70 with all the possible cases (GCC has no AltiVec code, for
71 instance). It's complicated because Darwin allows stores to
72 below the stack pointer, and the prologue code takes advantage of
73 this. */
74
75 if ((faulting_insn & 0xFFFF8000) == 0x94218000 /* stwu %r1, -xxx(%r1) */
76 || (faulting_insn & 0xFFFF03FF) == 0x7C21016E /* stwux %r1, xxx, %r1 */
77 || (faulting_insn & 0xFC1F8000) == 0x90018000 /* stw xxx, -yyy(%r1) */
78 || (faulting_insn & 0xFC1F8000) == 0xD8018000 /* stfd xxx, -yyy(%r1) */
79 || (faulting_insn & 0xFC1F8000) == 0xBC018000 /* stmw xxx, -yyy(%r1) */)
80 {
81 char *shell_name;
82
83 fnotice (stderr, "Out of stack space.\n");
84 shell_name = getenv ("SHELL");
85 if (shell_name != NULL)
86 shell_name = strrchr (shell_name, '/');
87 if (shell_name != NULL)
88 {
89 static const char * shell_commands[][2] = {
90 { "sh", "ulimit -S -s unlimited" },
91 { "bash", "ulimit -S -s unlimited" },
92 { "tcsh", "limit stacksize unlimited" },
93 { "csh", "limit stacksize unlimited" },
94 /* zsh doesn't have "unlimited", this will work under the
95 default configuration. */
96 { "zsh", "limit stacksize 32m" }
97 };
98 size_t i;
99
100 for (i = 0; i < ARRAY_SIZE (shell_commands); i++)
101 if (strcmp (shell_commands[i][0], shell_name + 1) == 0)
102 {
103 fnotice (stderr,
104 "Try running `%s' in the shell to raise its limit.\n",
105 shell_commands[i][1]);
106 }
107 }
108
109 if (global_dc->abort_on_error)
110 abort ();
111
112 exit (FATAL_EXIT_CODE);
113 }
114
115 fprintf (stderr, "[address=%08lx pc=%08x]\n",
116 uc->uc_mcontext->es.dar, uc->uc_mcontext->ss.srr0);
117 internal_error ("Segmentation Fault");
118 exit (FATAL_EXIT_CODE);
119}
120
121static void
122darwin_rs6000_extra_signals (void)
123{
124 struct sigaction sact;
125 stack_t sigstk;
126
127 sigstk.ss_sp = xmalloc (SIGSTKSZ);
128 sigstk.ss_size = SIGSTKSZ;
129 sigstk.ss_flags = 0;
130 if (sigaltstack (&sigstk, NULL) < 0)
131 fatal_error ("While setting up signal stack: %m");
132
133 sigemptyset(&sact.sa_mask);
134 sact.sa_flags = SA_ONSTACK | SA_SIGINFO;
135 sact.sa_sigaction = segv_handler;
136 if (sigaction (SIGSEGV, &sact, 0) < 0)
137 fatal_error ("While setting up signal handler: %m");
138}
139
|
140static void * darwin_rs6000_gt_pch_get_address (size_t);
141static bool darwin_rs6000_gt_pch_use_address (void *, size_t);
142
| |
143#undef HOST_HOOKS_GT_PCH_GET_ADDRESS
144#define HOST_HOOKS_GT_PCH_GET_ADDRESS darwin_rs6000_gt_pch_get_address
145#undef HOST_HOOKS_GT_PCH_USE_ADDRESS
146#define HOST_HOOKS_GT_PCH_USE_ADDRESS darwin_rs6000_gt_pch_use_address
147
| 140#undef HOST_HOOKS_GT_PCH_GET_ADDRESS
141#define HOST_HOOKS_GT_PCH_GET_ADDRESS darwin_rs6000_gt_pch_get_address
142#undef HOST_HOOKS_GT_PCH_USE_ADDRESS
143#define HOST_HOOKS_GT_PCH_USE_ADDRESS darwin_rs6000_gt_pch_use_address
144
|
148
| |
149/* Yes, this is really supposed to work. */
150static char pch_address_space[1024*1024*1024] __attribute__((aligned (4096)));
151
152/* Return the address of the PCH address space, if the PCH will fit in it. */
153
154static void *
| 145/* Yes, this is really supposed to work. */
146static char pch_address_space[1024*1024*1024] __attribute__((aligned (4096)));
147
148/* Return the address of the PCH address space, if the PCH will fit in it. */
149
150static void *
|
155darwin_rs6000_gt_pch_get_address (size_t sz)
| 151darwin_rs6000_gt_pch_get_address (size_t sz, int fd ATTRIBUTE_UNUSED)
|
156{
157 if (sz <= sizeof (pch_address_space))
158 return pch_address_space;
159 else
160 return NULL;
161}
162
163/* Check ADDR and SZ for validity, and deallocate (using munmap) that part of
164 pch_address_space beyond SZ. */
165
| 152{
153 if (sz <= sizeof (pch_address_space))
154 return pch_address_space;
155 else
156 return NULL;
157}
158
159/* Check ADDR and SZ for validity, and deallocate (using munmap) that part of
160 pch_address_space beyond SZ. */
161
|
166static bool
167darwin_rs6000_gt_pch_use_address (void *addr, size_t sz)
| 162static int
163darwin_rs6000_gt_pch_use_address (void *addr, size_t sz, int fd, size_t off)
|
168{
169 const size_t pagesize = getpagesize();
| 164{
165 const size_t pagesize = getpagesize();
|
170 bool result;
| 166 void *mmap_result;
167 int ret;
|
171
172 if ((size_t)pch_address_space % pagesize != 0
173 || sizeof (pch_address_space) % pagesize != 0)
174 abort ();
175
| 168
169 if ((size_t)pch_address_space % pagesize != 0
170 || sizeof (pch_address_space) % pagesize != 0)
171 abort ();
172
|
176 result = (addr == pch_address_space && sz <= sizeof (pch_address_space));
177 if (! result)
| 173 ret = (addr == pch_address_space && sz <= sizeof (pch_address_space));
174 if (! ret)
|
178 sz = 0;
179
180 /* Round the size to a whole page size. Normally this is a no-op. */
181 sz = (sz + pagesize - 1) / pagesize * pagesize;
182
183 if (munmap (pch_address_space + sz, sizeof (pch_address_space) - sz) != 0)
184 fatal_error ("couldn't unmap pch_address_space: %m\n");
185
| 175 sz = 0;
176
177 /* Round the size to a whole page size. Normally this is a no-op. */
178 sz = (sz + pagesize - 1) / pagesize * pagesize;
179
180 if (munmap (pch_address_space + sz, sizeof (pch_address_space) - sz) != 0)
181 fatal_error ("couldn't unmap pch_address_space: %m\n");
182
|
186 return result;
| 183 if (ret)
184 {
185 mmap_result = mmap (addr, sz,
186 PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED,
187 fd, off);
188
189 /* The file might not be mmap-able. */
190 ret = mmap_result != (void *) MAP_FAILED;
191
192 /* Sanity check for broken MAP_FIXED. */
193 if (ret && mmap_result != addr)
194 abort ();
195 }
196
197 return ret;
|
187}
| 198}
|
| 199
|
188
189const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;
| 200
201const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;
|