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 __NetBSD__
70 return &(context->uc_mcontext.__gregs[_REG_EFL]);
71 #elif defined LISP_FEATURE_WIN32
72 return (int *)&context->EFlags;
78 void arch_skip_instruction(os_context_t *context)
80 /* Assuming we get here via an INT3 xxx instruction, the PC now
81 * points to the interrupt code (a Lisp value) so we just move
82 * past it. Skip the code; after that, if the code is an
83 * error-trap or cerror-trap then skip the data bytes that follow. */
89 /* Get and skip the Lisp interrupt code. */
90 code = *(char*)(*os_context_pc_addr(context))++;
95 /* Lisp error arg vector length */
96 vlen = *(char*)(*os_context_pc_addr(context))++;
97 /* Skip Lisp error arg data bytes. */
99 ++*os_context_pc_addr(context);
103 case trap_Breakpoint: /* not tested */
104 case trap_FunEndBreakpoint: /* not tested */
107 case trap_PendingInterrupt:
109 /* only needed to skip the Code */
113 fprintf(stderr,"[arch_skip_inst invalid code %d\n]\n",code);
118 "/[arch_skip_inst resuming at %x]\n",
119 *os_context_pc_addr(context)));
123 arch_internal_error_arguments(os_context_t *context)
125 return 1 + (unsigned char *)(*os_context_pc_addr(context));
129 arch_pseudo_atomic_atomic(os_context_t *context)
131 return SymbolValue(PSEUDO_ATOMIC_ATOMIC,arch_os_get_current_thread());
135 arch_set_pseudo_atomic_interrupted(os_context_t *context)
137 SetSymbolValue(PSEUDO_ATOMIC_INTERRUPTED, make_fixnum(1),
138 arch_os_get_current_thread());
142 arch_clear_pseudo_atomic_interrupted(os_context_t *context)
144 SetSymbolValue(PSEUDO_ATOMIC_INTERRUPTED, make_fixnum(0),
145 arch_os_get_current_thread());
149 * This stuff seems to get called for TRACE and debug activity.
153 arch_install_breakpoint(void *pc)
155 unsigned int result = *(unsigned int*)pc;
157 *(char*)pc = BREAKPOINT_INST; /* x86 INT3 */
158 *((char*)pc+1) = trap_Breakpoint; /* Lisp trap code */
164 arch_remove_breakpoint(void *pc, unsigned int orig_inst)
166 *((char *)pc) = orig_inst & 0xff;
167 *((char *)pc + 1) = (orig_inst & 0xff00) >> 8;
170 /* When single stepping, single_stepping holds the original instruction
172 unsigned int *single_stepping = NULL;
173 #ifdef CANNOT_GET_TO_SINGLE_STEP_FLAG
174 unsigned int single_step_save1;
175 unsigned int single_step_save2;
176 unsigned int single_step_save3;
180 arch_do_displaced_inst(os_context_t *context, unsigned int orig_inst)
182 unsigned int *pc = (unsigned int*)(*os_context_pc_addr(context));
184 /* Put the original instruction back. */
185 *((char *)pc) = orig_inst & 0xff;
186 *((char *)pc + 1) = (orig_inst & 0xff00) >> 8;
188 #ifdef CANNOT_GET_TO_SINGLE_STEP_FLAG
189 /* Install helper instructions for the single step:
190 * pushf; or [esp],0x100; popf. */
191 single_step_save1 = *(pc-3);
192 single_step_save2 = *(pc-2);
193 single_step_save3 = *(pc-1);
194 *(pc-3) = 0x9c909090;
195 *(pc-2) = 0x00240c81;
196 *(pc-1) = 0x9d000001;
198 *context_eflags_addr(context) |= 0x100;
201 single_stepping = pc;
203 #ifdef CANNOT_GET_TO_SINGLE_STEP_FLAG
204 *os_context_pc_addr(context) = (char *)pc - 9;
209 sigtrap_handler(int signal, siginfo_t *info, void *void_context)
211 os_context_t *context = (os_context_t*)void_context;
214 #ifndef LISP_FEATURE_WIN32
215 if (single_stepping && (signal==SIGTRAP))
217 /* fprintf(stderr,"* single step trap %x\n", single_stepping); */
219 #ifdef CANNOT_GET_TO_SINGLE_STEP_FLAG
220 /* Un-install single step helper instructions. */
221 *(single_stepping-3) = single_step_save1;
222 *(single_stepping-2) = single_step_save2;
223 *(single_stepping-1) = single_step_save3;
225 *context_eflags_addr(context) ^= 0x100;
227 /* Re-install the breakpoint if possible. */
228 if (*os_context_pc_addr(context) == (int)single_stepping + 1) {
229 fprintf(stderr, "warning: couldn't reinstall breakpoint\n");
231 *((char *)single_stepping) = BREAKPOINT_INST; /* x86 INT3 */
232 *((char *)single_stepping+1) = trap_Breakpoint;
235 single_stepping = NULL;
240 /* This is just for info in case the monitor wants to print an
242 current_control_stack_pointer =
243 (lispobj *)*os_context_sp_addr(context);
245 /* FIXME: CMUCL puts the float control restoration code here.
246 Thus, it seems to me that single-stepping won't restore the
247 float control. Since SBCL currently doesn't support
248 single-stepping (as far as I can tell) this is somewhat moot,
249 but it might be worth either moving this code up or deleting
250 the single-stepping code entirely. -- CSR, 2002-07-15 */
251 #ifdef LISP_FEATURE_LINUX
252 os_restore_fp_control(context);
255 /* On entry %eip points just after the INT3 byte and aims at the
256 * 'kind' value (eg trap_Cerror). For error-trap and Cerror-trap a
257 * number of bytes will follow, the first is the length of the byte
258 * arguments to follow. */
259 trap = *(unsigned char *)(*os_context_pc_addr(context));
262 case trap_PendingInterrupt:
263 FSHOW((stderr, "/<trap pending interrupt>\n"));
264 arch_skip_instruction(context);
265 interrupt_handle_pending(context);
269 /* Note: the old CMU CL code tried to save FPU state
270 * here, and restore it after we do our thing, but there
271 * seems to be no point in doing that, since we're just
272 * going to lose(..) anyway. */
273 fake_foreign_function_call(context);
274 lose("%%PRIMITIVE HALT called; the party is over.\n");
278 FSHOW((stderr, "<trap error/cerror %d>\n", trap));
279 interrupt_internal_error(signal, info, context, trap==trap_Cerror);
282 case trap_Breakpoint:
283 --*os_context_pc_addr(context);
284 handle_breakpoint(signal, info, context);
287 case trap_FunEndBreakpoint:
288 --*os_context_pc_addr(context);
289 *os_context_pc_addr(context) =
290 (int)handle_fun_end_breakpoint(signal, info, context);
294 FSHOW((stderr,"/[C--trap default %d %d %x]\n",
295 signal, trap, context));
296 interrupt_handle_now(signal, info, context);
302 sigill_handler(int signal, siginfo_t *siginfo, void *void_context) {
303 os_context_t *context = (os_context_t*)void_context;
304 fake_foreign_function_call(context);
305 monitor_or_something();
309 arch_install_interrupt_handlers()
311 SHOW("entering arch_install_interrupt_handlers()");
313 /* Note: The old CMU CL code here used sigtrap_handler() to handle
314 * SIGILL as well as SIGTRAP. I couldn't see any reason to do
315 * things that way. So, I changed to separate handlers when
316 * debugging a problem on OpenBSD, where SBCL wasn't catching
317 * SIGILL properly, but was instead letting the process be
318 * terminated with an "Illegal instruction" output. If this change
319 * turns out to break something (maybe breakpoint handling on some
320 * OS I haven't tested on?) and we have to go back to the old CMU
321 * CL way, I hope there will at least be a comment to explain
322 * why.. -- WHN 2001-06-07 */
323 #ifndef LISP_FEATURE_WIN32
324 undoably_install_low_level_interrupt_handler(SIGILL , sigill_handler);
325 undoably_install_low_level_interrupt_handler(SIGTRAP, sigtrap_handler);
328 SHOW("returning from arch_install_interrupt_handlers()");
331 /* This is implemented in assembly language and called from C: */
333 call_into_lisp(lispobj fun, lispobj *args, int nargs);
335 /* These functions are an interface to the Lisp call-in facility.
336 * Since this is C we can know nothing about the calling environment.
337 * The control stack might be the C stack if called from the monitor
338 * or the Lisp stack if called as a result of an interrupt or maybe
339 * even a separate stack. The args are most likely on that stack but
340 * could be in registers depending on what the compiler likes. So we
341 * copy the args into a portable vector and let the assembly language
342 * call-in function figure it out. */
345 funcall0(lispobj function)
347 lispobj *args = NULL;
349 FSHOW((stderr, "/entering funcall0(0x%lx)\n", (long)function));
350 return call_into_lisp(function, args, 0);
353 funcall1(lispobj function, lispobj arg0)
357 return call_into_lisp(function, args, 1);
360 funcall2(lispobj function, lispobj arg0, lispobj arg1)
365 return call_into_lisp(function, args, 2);
368 funcall3(lispobj function, lispobj arg0, lispobj arg1, lispobj arg2)
374 return call_into_lisp(function, args, 3);
377 #ifdef LISP_FEATURE_LINKAGE_TABLE
378 /* FIXME: It might be cleaner to generate these from the lisp side of
383 arch_write_linkage_table_jmp(char * reloc, void * fun)
385 /* Make JMP to function entry. JMP offset is calculated from next
388 long offset = (char *)fun - (reloc + 5);
391 *reloc++ = 0xe9; /* opcode for JMP rel32 */
392 for (i = 0; i < 4; i++) {
393 *reloc++ = offset & 0xff;
397 /* write a nop for good measure. */
402 arch_write_linkage_table_ref(void * reloc, void * data)
404 *(unsigned long *)reloc = (unsigned long)data;