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.
24 #include "interrupt.h"
26 #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;
40 arch_get_bad_addr(int sig, siginfo_t *code, os_context_t *context)
42 return (os_vm_address_t)code->si_addr;
47 * hacking signal contexts
49 * (This depends both on architecture, which determines what we might
50 * want to get to, and on OS, which determines how we get to it.)
54 context_eflags_addr(os_context_t *context)
57 /* KLUDGE: As of kernel 2.2.14 on Red Hat 6.2, there's code in the
58 * <sys/ucontext.h> file to define symbolic names for offsets into
59 * gregs[], but it's conditional on __USE_GNU and not defined, so
60 * we need to do this nasty absolute index magic number thing
62 return &context->uc_mcontext.gregs[17];
63 #elif defined __FreeBSD__
64 return &context->uc_mcontext.mc_eflags;
65 #elif defined __OpenBSD__
66 return &context->sc_eflags;
72 void arch_skip_instruction(os_context_t *context)
74 /* Assuming we get here via an INT3 xxx instruction, the PC now
75 * points to the interrupt code (a Lisp value) so we just move
76 * past it. Skip the code; after that, if the code is an
77 * error-trap or cerror-trap then skip the data bytes that follow. */
83 /* Get and skip the Lisp interrupt code. */
84 code = *(char*)(*os_context_pc_addr(context))++;
89 /* Lisp error arg vector length */
90 vlen = *(char*)(*os_context_pc_addr(context))++;
91 /* Skip Lisp error arg data bytes. */
93 ++*os_context_pc_addr(context);
97 case trap_Breakpoint: /* not tested */
98 case trap_FunEndBreakpoint: /* not tested */
101 case trap_PendingInterrupt:
103 /* only needed to skip the Code */
107 fprintf(stderr,"[arch_skip_inst invalid code %d\n]\n",code);
112 "/[arch_skip_inst resuming at %x]\n",
113 *os_context_pc_addr(context)));
117 arch_internal_error_arguments(os_context_t *context)
119 return 1 + (unsigned char *)(*os_context_pc_addr(context));
123 arch_pseudo_atomic_atomic(os_context_t *context)
125 return SymbolValue(PSEUDO_ATOMIC_ATOMIC,arch_os_get_current_thread());
129 arch_set_pseudo_atomic_interrupted(os_context_t *context)
131 SetSymbolValue(PSEUDO_ATOMIC_INTERRUPTED, make_fixnum(1),
132 arch_os_get_current_thread());
136 arch_clear_pseudo_atomic_interrupted(os_context_t *context)
138 SetSymbolValue(PSEUDO_ATOMIC_INTERRUPTED, make_fixnum(0),
139 arch_os_get_current_thread());
143 * This stuff seems to get called for TRACE and debug activity.
147 arch_install_breakpoint(void *pc)
149 unsigned int result = *(unsigned int*)pc;
151 *(char*)pc = BREAKPOINT_INST; /* x86 INT3 */
152 *((char*)pc+1) = trap_Breakpoint; /* Lisp trap code */
158 arch_remove_breakpoint(void *pc, unsigned int orig_inst)
160 *((char *)pc) = orig_inst & 0xff;
161 *((char *)pc + 1) = (orig_inst & 0xff00) >> 8;
164 /* When single stepping, single_stepping holds the original instruction
166 unsigned int *single_stepping = NULL;
169 arch_do_displaced_inst(os_context_t *context, unsigned int orig_inst)
171 unsigned int *pc = (unsigned int*)(*os_context_pc_addr(context));
173 /* Put the original instruction back. */
174 *((char *)pc) = orig_inst & 0xff;
175 *((char *)pc + 1) = (orig_inst & 0xff00) >> 8;
177 *context_eflags_addr(context) |= 0x100;
179 single_stepping = pc;
184 sigtrap_handler(int signal, siginfo_t *info, void *void_context)
186 int code = info->si_code;
187 os_context_t *context = (os_context_t*)void_context;
190 if (single_stepping && (signal==SIGTRAP))
192 *context_eflags_addr(context) ^= 0x100;
194 /* Re-install the breakpoint if possible. */
195 if (*os_context_pc_addr(context) == (int)single_stepping + 1) {
196 fprintf(stderr, "warning: couldn't reinstall breakpoint\n");
198 *((char *)single_stepping) = BREAKPOINT_INST; /* x86 INT3 */
199 *((char *)single_stepping+1) = trap_Breakpoint;
202 single_stepping = NULL;
206 /* This is just for info in case the monitor wants to print an
208 current_control_stack_pointer =
209 (lispobj *)*os_context_sp_addr(context);
211 /* FIXME: CMUCL puts the float control restoration code here.
212 Thus, it seems to me that single-stepping won't restore the
213 float control. Since SBCL currently doesn't support
214 single-stepping (as far as I can tell) this is somewhat moot,
215 but it might be worth either moving this code up or deleting
216 the single-stepping code entirely. -- CSR, 2002-07-15 */
217 #ifdef LISP_FEATURE_LINUX
218 os_restore_fp_control(context);
221 /* On entry %eip points just after the INT3 byte and aims at the
222 * 'kind' value (eg trap_Cerror). For error-trap and Cerror-trap a
223 * number of bytes will follow, the first is the length of the byte
224 * arguments to follow. */
225 trap = *(unsigned char *)(*os_context_pc_addr(context));
228 case trap_PendingInterrupt:
229 FSHOW((stderr, "/<trap pending interrupt>\n"));
230 arch_skip_instruction(context);
231 interrupt_handle_pending(context);
235 /* Note: the old CMU CL code tried to save FPU state
236 * here, and restore it after we do our thing, but there
237 * seems to be no point in doing that, since we're just
238 * going to lose(..) anyway. */
239 fake_foreign_function_call(context);
240 lose("%%PRIMITIVE HALT called; the party is over.\n");
244 FSHOW((stderr, "<trap error/cerror %d>\n", code));
245 interrupt_internal_error(signal, info, context, code==trap_Cerror);
248 case trap_Breakpoint:
249 --*os_context_pc_addr(context);
250 handle_breakpoint(signal, info, context);
253 case trap_FunEndBreakpoint:
254 --*os_context_pc_addr(context);
255 *os_context_pc_addr(context) =
256 (unsigned long)handle_fun_end_breakpoint(signal, info, context);
260 FSHOW((stderr,"/[C--trap default %d %d %x]\n",
261 signal, code, context));
262 interrupt_handle_now(signal, info, context);
268 sigill_handler(int signal, siginfo_t *siginfo, void *void_context) {
269 os_context_t *context = (os_context_t*)void_context;
270 fake_foreign_function_call(context);
271 lose("fake_foreign_function_call fell through");
275 arch_install_interrupt_handlers()
277 SHOW("entering arch_install_interrupt_handlers()");
279 /* Note: The old CMU CL code here used sigtrap_handler() to handle
280 * SIGILL as well as SIGTRAP. I couldn't see any reason to do
281 * things that way. So, I changed to separate handlers when
282 * debugging a problem on OpenBSD, where SBCL wasn't catching
283 * SIGILL properly, but was instead letting the process be
284 * terminated with an "Illegal instruction" output. If this change
285 * turns out to break something (maybe breakpoint handling on some
286 * OS I haven't tested on?) and we have to go back to the old CMU
287 * CL way, I hope there will at least be a comment to explain
288 * why.. -- WHN 2001-06-07 */
289 undoably_install_low_level_interrupt_handler(SIGILL , sigill_handler);
290 undoably_install_low_level_interrupt_handler(SIGTRAP, sigtrap_handler);
292 SHOW("returning from arch_install_interrupt_handlers()");
295 /* This is implemented in assembly language and called from C: */
297 call_into_lisp(lispobj fun, lispobj *args, int nargs);
299 /* These functions are an interface to the Lisp call-in facility.
300 * Since this is C we can know nothing about the calling environment.
301 * The control stack might be the C stack if called from the monitor
302 * or the Lisp stack if called as a result of an interrupt or maybe
303 * even a separate stack. The args are most likely on that stack but
304 * could be in registers depending on what the compiler likes. So we
305 * copy the args into a portable vector and let the assembly language
306 * call-in function figure it out. */
309 funcall0(lispobj function)
311 lispobj *args = NULL;
313 FSHOW((stderr, "/entering funcall0(0x%lx)\n", (long)function));
314 return call_into_lisp(function, args, 0);
317 funcall1(lispobj function, lispobj arg0)
321 return call_into_lisp(function, args, 1);
324 funcall2(lispobj function, lispobj arg0, lispobj arg1)
329 return call_into_lisp(function, args, 2);
332 funcall3(lispobj function, lispobj arg0, lispobj arg1, lispobj arg2)
338 return call_into_lisp(function, args, 3);
342 #ifdef LISP_FEATURE_LINKAGE_TABLE
343 /* FIXME: It might be cleaner to generate these from the lisp side of
348 arch_write_linkage_table_jmp(char * reloc, void * fun)
350 unsigned long addr = (unsigned long) fun;
353 *reloc++ = 0xFF; /* Opcode for near jump to absolute reg/mem64. */
354 *reloc++ = 0x25; /* ModRM #b00 100 101, i.e. RIP-relative. */
355 *reloc++ = 0x00; /* 32-bit displacement field = 0 */
356 *reloc++ = 0x00; /* ... */
357 *reloc++ = 0x00; /* ... */
358 *reloc++ = 0x00; /* ... */
360 for (i = 0; i < 8; i++) {
361 *reloc++ = addr & 0xff;
365 /* write a nop for good measure. */
370 arch_write_linkage_table_ref(void * reloc, void * data)
372 *(unsigned long *)reloc = (unsigned long)data;
377 /* These setup and check *both* the sse2 and x87 FPUs. While lisp code
378 only uses the sse2 FPU, other code (such as libc) may use the x87 FPU.
386 /* return the x87 exception flags ored in with the sse2
387 * control+status flags */
388 asm ("fnstsw %0" : "=m" (temp));
391 asm ("stmxcsr %0" : "=m" (temp));
393 /* flip exception mask bits */
394 return result ^ (0x3F << 7);
400 unsigned short unused1;
402 unsigned short unused2;
403 unsigned int other_regs[5];
407 arch_set_fp_modes(unsigned int mxcsr)
412 /* turn trap enable bits into exception mask */
416 asm ("fnstenv %0" : "=m" (f_env));
417 /* set control word: always long double precision
418 * get traps and rounding from mxcsr word */
419 f_env.cw = 0x300 | ((mxcsr >> 7) & 0x3F) | (((mxcsr >> 13) & 0x3) << 10);
420 /* set status word: only override exception flags, from mxcsr */
422 f_env.sw |= (mxcsr & 0x3F);
424 asm ("fldenv %0" : : "m" (f_env));
426 /* now, simply, load up the mxcsr register */
428 asm ("ldmxcsr %0" : : "m" (temp));