2 * This software is part of the SBCL system. See the README file for
5 * This software is derived from the CMU CL system, which was
6 * written at Carnegie Mellon University and released into the
7 * public domain. The software is in the public domain and is
8 * provided with absolutely no warranty. See the COPYING and CREDITS
9 * files for more information.
23 #include "interrupt.h"
25 #include "breakpoint.h"
29 #include "genesis/static-symbols.h"
30 #include "genesis/symbol.h"
32 #define BREAKPOINT_INST 0xcc /* INT3 */
34 unsigned long fast_random_state = 1;
39 #ifndef LISP_FEATURE_WIN32
41 arch_get_bad_addr(int sig, siginfo_t *code, os_context_t *context)
43 return (os_vm_address_t)code->si_addr;
49 * hacking signal contexts
51 * (This depends both on architecture, which determines what we might
52 * want to get to, and on OS, which determines how we get to it.)
56 context_eflags_addr(os_context_t *context)
58 #if defined __linux__ || defined __sun
59 /* KLUDGE: As of kernel 2.2.14 on Red Hat 6.2, there's code in the
60 * <sys/ucontext.h> file to define symbolic names for offsets into
61 * gregs[], but it's conditional on __USE_GNU and not defined, so
62 * we need to do this nasty absolute index magic number thing
64 return &context->uc_mcontext.gregs[16];
65 #elif defined __FreeBSD__
66 return &context->uc_mcontext.mc_eflags;
67 #elif defined __OpenBSD__
68 return &context->sc_eflags;
69 #elif defined LISP_FEATURE_DARWIN
70 return &context->uc_mcontext->ss.eflags;
71 #elif defined __NetBSD__
72 return &(context->uc_mcontext.__gregs[_REG_EFL]);
73 #elif defined LISP_FEATURE_WIN32
74 return (int *)&context->EFlags;
80 void arch_skip_instruction(os_context_t *context)
82 /* Assuming we get here via an INT3 xxx instruction, the PC now
83 * points to the interrupt code (a Lisp value) so we just move
84 * past it. Skip the code; after that, if the code is an
85 * error-trap or cerror-trap then skip the data bytes that follow. */
91 /* Get and skip the Lisp interrupt code. */
92 code = *(char*)(*os_context_pc_addr(context))++;
97 /* Lisp error arg vector length */
98 vlen = *(char*)(*os_context_pc_addr(context))++;
99 /* Skip Lisp error arg data bytes. */
101 ++*os_context_pc_addr(context);
105 case trap_Breakpoint: /* not tested */
106 case trap_FunEndBreakpoint: /* not tested */
109 case trap_PendingInterrupt:
111 /* only needed to skip the Code */
115 fprintf(stderr,"[arch_skip_inst invalid code %d\n]\n",code);
120 "/[arch_skip_inst resuming at %x]\n",
121 *os_context_pc_addr(context)));
125 arch_internal_error_arguments(os_context_t *context)
127 return 1 + (unsigned char *)(*os_context_pc_addr(context));
131 arch_pseudo_atomic_atomic(os_context_t *context)
133 return SymbolValue(PSEUDO_ATOMIC_ATOMIC,arch_os_get_current_thread());
137 arch_set_pseudo_atomic_interrupted(os_context_t *context)
139 SetSymbolValue(PSEUDO_ATOMIC_INTERRUPTED, make_fixnum(1),
140 arch_os_get_current_thread());
144 arch_clear_pseudo_atomic_interrupted(os_context_t *context)
146 SetSymbolValue(PSEUDO_ATOMIC_INTERRUPTED, make_fixnum(0),
147 arch_os_get_current_thread());
151 * This stuff seems to get called for TRACE and debug activity.
155 arch_install_breakpoint(void *pc)
157 unsigned int result = *(unsigned int*)pc;
159 *(char*)pc = BREAKPOINT_INST; /* x86 INT3 */
160 *((char*)pc+1) = trap_Breakpoint; /* Lisp trap code */
166 arch_remove_breakpoint(void *pc, unsigned int orig_inst)
168 *((char *)pc) = orig_inst & 0xff;
169 *((char *)pc + 1) = (orig_inst & 0xff00) >> 8;
174 arch_do_displaced_inst(os_context_t *context, unsigned int orig_inst)
176 unsigned int *pc = (unsigned int*)(*os_context_pc_addr(context));
178 /* Put the original instruction back. */
179 *((char *)pc) = orig_inst & 0xff;
180 *((char *)pc + 1) = (orig_inst & 0xff00) >> 8;
185 sigtrap_handler(int signal, siginfo_t *info, void *void_context)
187 os_context_t *context = (os_context_t*)void_context;
190 /* This is just for info in case the monitor wants to print an
192 current_control_stack_pointer =
193 (lispobj *)*os_context_sp_addr(context);
195 #ifdef LISP_FEATURE_LINUX
196 os_restore_fp_control(context);
199 /* On entry %eip points just after the INT3 byte and aims at the
200 * 'kind' value (eg trap_Cerror). For error-trap and Cerror-trap a
201 * number of bytes will follow, the first is the length of the byte
202 * arguments to follow. */
203 trap = *(unsigned char *)(*os_context_pc_addr(context));
204 /* FSHOW((stderr, "/<sigtrap trap %d at pc_addr: %p>\n", trap, *os_context_pc_addr(context))); */
207 case trap_PendingInterrupt:
208 FSHOW((stderr, "/<trap pending interrupt>\n"));
209 arch_skip_instruction(context);
210 interrupt_handle_pending(context);
214 /* Note: the old CMU CL code tried to save FPU state
215 * here, and restore it after we do our thing, but there
216 * seems to be no point in doing that, since we're just
217 * going to lose(..) anyway. */
218 fake_foreign_function_call(context);
219 lose("%%PRIMITIVE HALT called; the party is over.\n");
223 FSHOW((stderr, "<trap error/cerror %d>\n", trap));
224 interrupt_internal_error(signal, info, context, trap==trap_Cerror);
227 case trap_Breakpoint:
228 --*os_context_pc_addr(context);
229 handle_breakpoint(signal, info, context);
232 case trap_FunEndBreakpoint:
233 --*os_context_pc_addr(context);
234 *os_context_pc_addr(context) =
235 (int)handle_fun_end_breakpoint(signal, info, context);
239 FSHOW((stderr,"/[C--trap default %d %d %x]\n",
240 signal, trap, context));
241 interrupt_handle_now(signal, info, context);
247 sigill_handler(int signal, siginfo_t *siginfo, void *void_context) {
248 os_context_t *context = (os_context_t*)void_context;
250 #if defined(LISP_FEATURE_DARWIN)
251 if (*((unsigned short *)*os_context_pc_addr(context)) == 0x0b0f) {
252 *os_context_pc_addr(context) += 2;
253 return sigtrap_handler(signal, siginfo, void_context);
257 fake_foreign_function_call(context);
258 monitor_or_something();
262 arch_install_interrupt_handlers()
264 SHOW("entering arch_install_interrupt_handlers()");
266 /* Note: The old CMU CL code here used sigtrap_handler() to handle
267 * SIGILL as well as SIGTRAP. I couldn't see any reason to do
268 * things that way. So, I changed to separate handlers when
269 * debugging a problem on OpenBSD, where SBCL wasn't catching
270 * SIGILL properly, but was instead letting the process be
271 * terminated with an "Illegal instruction" output. If this change
272 * turns out to break something (maybe breakpoint handling on some
273 * OS I haven't tested on?) and we have to go back to the old CMU
274 * CL way, I hope there will at least be a comment to explain
275 * why.. -- WHN 2001-06-07 */
276 #ifndef LISP_FEATURE_WIN32
277 undoably_install_low_level_interrupt_handler(SIGILL , sigill_handler);
278 undoably_install_low_level_interrupt_handler(SIGTRAP, sigtrap_handler);
281 SHOW("returning from arch_install_interrupt_handlers()");
284 /* This is implemented in assembly language and called from C: */
286 call_into_lisp(lispobj fun, lispobj *args, int nargs);
288 /* These functions are an interface to the Lisp call-in facility.
289 * Since this is C we can know nothing about the calling environment.
290 * The control stack might be the C stack if called from the monitor
291 * or the Lisp stack if called as a result of an interrupt or maybe
292 * even a separate stack. The args are most likely on that stack but
293 * could be in registers depending on what the compiler likes. So we
294 * copy the args into a portable vector and let the assembly language
295 * call-in function figure it out. */
298 funcall0(lispobj function)
300 lispobj *args = NULL;
302 FSHOW((stderr, "/entering funcall0(0x%lx)\n", (long)function));
303 return call_into_lisp(function, args, 0);
306 funcall1(lispobj function, lispobj arg0)
310 return call_into_lisp(function, args, 1);
313 funcall2(lispobj function, lispobj arg0, lispobj arg1)
318 return call_into_lisp(function, args, 2);
321 funcall3(lispobj function, lispobj arg0, lispobj arg1, lispobj arg2)
327 return call_into_lisp(function, args, 3);
330 #ifdef LISP_FEATURE_LINKAGE_TABLE
331 /* FIXME: It might be cleaner to generate these from the lisp side of
336 arch_write_linkage_table_jmp(char * reloc, void * fun)
338 /* Make JMP to function entry. JMP offset is calculated from next
341 long offset = (char *)fun - (reloc + 5);
344 *reloc++ = 0xe9; /* opcode for JMP rel32 */
345 for (i = 0; i < 4; i++) {
346 *reloc++ = offset & 0xff;
350 /* write a nop for good measure. */
355 arch_write_linkage_table_ref(void * reloc, void * data)
357 *(unsigned long *)reloc = (unsigned long)data;