2 * exceptions-ppc.c: exception support for PowerPC
5 * Dietmar Maurer (dietmar@ximian.com)
6 * Paolo Molaro (lupus@ximian.com)
8 * (C) 2001 Ximian, Inc.
17 #include <mono/arch/ppc/ppc-codegen.h>
18 #include <mono/metadata/appdomain.h>
19 #include <mono/metadata/tabledefs.h>
20 #include <mono/metadata/threads.h>
21 #include <mono/metadata/debug-helpers.h>
22 #include <mono/metadata/exception.h>
23 #include <mono/metadata/mono-debug.h>
28 static gboolean arch_handle_exception (MonoContext *ctx, gpointer obj, gboolean test_only);
33 int sc_onstack; // sigstack state to restore
34 int sc_mask; // signal mask to restore
36 int sc_psw; // processor status word
37 int sc_sp; // stack pointer if sc_regs == NULL
38 void *sc_regs; // (kernel private) saved state
43 sigset_t uc_sigmask; // signal mask used by this context
44 stack_t uc_stack; // stack used by this context
45 struct ucontext *uc_link; // pointer to resuming context
46 size_t uc_mcsize; // size of the machine context passed in
47 mcontext_t uc_mcontext; // machine specific context
50 typedef struct ppc_exception_state {
51 unsigned long dar; // Fault registers for coredump
53 unsigned long exception;// number of powerpc exception taken
54 unsigned long pad0; // align to 16 bytes
56 unsigned long pad1[4]; // space in PCB "just in case"
57 } ppc_exception_state_t;
59 typedef struct ppc_vector_state {
60 unsigned long save_vr[32][4];
61 unsigned long save_vscr[4];
62 unsigned int save_pad5[4];
63 unsigned int save_vrvalid; // VRs that have been saved
64 unsigned int save_pad6[7];
67 typedef struct ppc_float_state {
70 unsigned int fpscr_pad; // fpscr is 64 bits, 32 bits of rubbish
71 unsigned int fpscr; // floating point status register
74 typedef struct ppc_thread_state {
75 unsigned int srr0; // Instruction address register (PC)
76 unsigned int srr1; // Machine state register (supervisor)
82 unsigned int cr; // Condition register
83 unsigned int xer; // User's integer exception register
84 unsigned int lr; // Link register
85 unsigned int ctr; // Count register
86 unsigned int mq; // MQ register (601 only)
88 unsigned int vrsave; // Vector Save Register
92 ppc_exception_state_t es;
93 ppc_thread_state_t ss;
95 ppc_vector_state_t vs;
98 typedef struct mcontext * mcontext_t;
100 Linux/PPC instead has:
102 unsigned long _unused[4];
104 unsigned long handler;
105 unsigned long oldmask;
106 struct pt_regs *regs;
109 unsigned long gpr[32];
112 unsigned long orig_gpr3; // Used for restarting system calls
117 unsigned long mq; // 601 only (not used at present)
118 // Used on APUS to hold IPL value.
119 unsigned long trap; // Reason for being here
120 // N.B. for critical exceptions on 4xx, the dar and dsisr
121 // fields are overloaded to hold srr0 and srr1.
122 unsigned long dar; // Fault registers
123 unsigned long dsisr; // on 4xx/Book-E used for ESR
124 unsigned long result; // Result of a system call
127 elf_gregset_t mc_gregs;
128 elf_fpregset_t mc_fregs;
129 unsigned long mc_pad[2];
130 elf_vrregset_t mc_vregs __attribute__((__aligned__(16)));
134 unsigned long uc_flags;
135 struct ucontext *uc_link;
138 struct mcontext *uc_regs; // points to uc_mcontext field
140 // glibc has 1024-bit signal masks, ours are 64-bit
143 struct mcontext uc_mcontext;
146 #define ELF_NGREG 48 // includes nip, msr, lr, etc.
147 #define ELF_NFPREG 33 // includes fpscr
150 typedef unsigned long elf_greg_t;
151 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
153 // Floating point registers
154 typedef double elf_fpreg_t;
155 typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
161 #define restore_regs_from_context(ctx_reg,ip_reg,tmp_reg) do { \
163 ppc_lwz (code, ip_reg, G_STRUCT_OFFSET (MonoContext, sc_ir), ctx_reg); \
164 ppc_lmw (code, ppc_r13, ctx_reg, G_STRUCT_OFFSET (MonoContext, regs)); \
165 for (reg = 0; reg < MONO_SAVED_FREGS; ++reg) { \
166 ppc_lfd (code, (14 + reg), G_STRUCT_OFFSET(MonoLMF, fregs) + reg * sizeof (gdouble), ctx_reg); \
171 #define setup_context(ctx)
174 * arch_get_restore_context:
176 * Returns a pointer to a method which restores a previously saved sigcontext.
177 * The first argument in r3 is the pointer to the context.
180 mono_arch_get_restore_context (void)
183 static guint8 *start = NULL;
188 code = start = mono_global_codeman_reserve (128);
189 restore_regs_from_context (ppc_r3, ppc_r4, ppc_r5);
190 /* restore also the stack pointer */
191 ppc_lwz (code, ppc_sp, G_STRUCT_OFFSET (MonoContext, sc_sp), ppc_r3);
193 /* jump to the saved IP */
194 ppc_mtctr (code, ppc_r4);
195 ppc_bcctr (code, PPC_BR_ALWAYS, 0);
199 g_assert ((code - start) < 128);
200 mono_arch_flush_icache (start, code - start);
205 * arch_get_call_filter:
207 * Returns a pointer to a method which calls an exception filter. We
208 * also use this function to call finally handlers (we pass NULL as
209 * @exc object in this case).
212 arch_get_call_filter (void)
214 static guint8 *start = NULL;
216 int alloc_size, pos, i;
221 /* call_filter (MonoContext *ctx, unsigned long eip, gpointer exc) */
222 code = start = mono_global_codeman_reserve (320);
224 /* save all the regs on the stack */
226 for (i = 31; i >= 14; --i) {
227 pos += sizeof (gdouble);
228 ppc_stfd (code, i, -pos, ppc_sp);
230 pos += sizeof (gulong) * MONO_SAVED_GREGS;
231 ppc_stmw (code, ppc_r13, ppc_sp, -pos);
233 ppc_mflr (code, ppc_r0);
234 ppc_stw (code, ppc_r0, PPC_RET_ADDR_OFFSET, ppc_sp);
236 alloc_size = PPC_MINIMAL_STACK_SIZE + pos + 64;
237 // align to PPC_STACK_ALIGNMENT bytes
238 alloc_size += PPC_STACK_ALIGNMENT - 1;
239 alloc_size &= ~(PPC_STACK_ALIGNMENT - 1);
241 g_assert ((alloc_size & (PPC_STACK_ALIGNMENT-1)) == 0);
242 ppc_stwu (code, ppc_sp, -alloc_size, ppc_sp);
244 /* restore all the regs from ctx (in r3), but not r1, the stack pointer */
245 restore_regs_from_context (ppc_r3, ppc_r6, ppc_r7);
246 /* call handler at eip (r4) and set the first arg with the exception (r5) */
247 ppc_mtctr (code, ppc_r4);
248 ppc_mr (code, ppc_r3, ppc_r5);
249 ppc_bcctrl (code, PPC_BR_ALWAYS, 0);
252 ppc_lwz (code, ppc_r0, alloc_size + PPC_RET_ADDR_OFFSET, ppc_sp);
253 ppc_mtlr (code, ppc_r0);
254 ppc_addic (code, ppc_sp, ppc_sp, alloc_size);
256 /* restore all the regs from the stack */
258 for (i = 31; i >= 14; --i) {
259 pos += sizeof (double);
260 ppc_lfd (code, i, -pos, ppc_sp);
262 pos += sizeof (gulong) * MONO_SAVED_GREGS;
263 ppc_lmw (code, ppc_r13, ppc_sp, -pos);
267 g_assert ((code - start) < 320);
268 mono_arch_flush_icache (start, code - start);
273 throw_exception (MonoObject *exc, unsigned long eip, unsigned long esp, gulong *int_regs, gdouble *fp_regs, gboolean rethrow)
275 static void (*restore_context) (MonoContext *);
278 if (!restore_context)
279 restore_context = mono_arch_get_restore_context ();
281 /* adjust eip so that it point into the call instruction */
284 setup_context (&ctx);
286 /*printf ("stack in throw: %p\n", esp);*/
287 MONO_CONTEXT_SET_BP (&ctx, esp);
288 MONO_CONTEXT_SET_IP (&ctx, eip);
289 memcpy (&ctx.regs, int_regs, sizeof (gulong) * MONO_SAVED_GREGS);
290 memcpy (&ctx.fregs, fp_regs, sizeof (double) * MONO_SAVED_FREGS);
292 if (mono_object_isinst (exc, mono_defaults.exception_class)) {
293 MonoException *mono_ex = (MonoException*)exc;
295 mono_ex->stack_trace = NULL;
297 arch_handle_exception (&ctx, exc, FALSE);
298 restore_context (&ctx);
300 g_assert_not_reached ();
304 * arch_get_throw_exception_generic:
306 * Returns a function pointer which can be used to raise
307 * exceptions. The returned function has the following
308 * signature: void (*func) (MonoException *exc); or
309 * void (*func) (char *exc_name);
313 mono_arch_get_throw_exception_generic (guint8 *start, int size, int by_name, gboolean rethrow)
316 int alloc_size, pos, i;
320 /* save all the regs on the stack */
322 for (i = 31; i >= 14; --i) {
323 pos += sizeof (gdouble);
324 ppc_stfd (code, i, -pos, ppc_sp);
326 pos += sizeof (gulong) * MONO_SAVED_GREGS;
327 ppc_stmw (code, ppc_r13, ppc_sp, -pos);
329 ppc_mflr (code, ppc_r0);
330 ppc_stw (code, ppc_r0, PPC_RET_ADDR_OFFSET, ppc_sp);
332 alloc_size = PPC_MINIMAL_STACK_SIZE + pos + 64;
333 // align to PPC_STACK_ALIGNMENT bytes
334 alloc_size += PPC_STACK_ALIGNMENT - 1;
335 alloc_size &= ~(PPC_STACK_ALIGNMENT - 1);
337 g_assert ((alloc_size & (PPC_STACK_ALIGNMENT-1)) == 0);
338 ppc_stwu (code, ppc_sp, -alloc_size, ppc_sp);
342 ppc_mr (code, ppc_r5, ppc_r3);
343 ppc_load (code, ppc_r3, mono_defaults.corlib);
344 ppc_load (code, ppc_r4, "System");
345 ppc_load (code, ppc_r0, mono_exception_from_name);
346 ppc_mtctr (code, ppc_r0);
347 ppc_bcctrl (code, PPC_BR_ALWAYS, 0);
350 /* call throw_exception (exc, ip, sp, int_regs, fp_regs) */
352 ppc_lwz (code, ppc_r5, 0, ppc_sp);
353 /* exc is already in place in r3 */
355 ppc_lwz (code, ppc_r4, PPC_RET_ADDR_OFFSET, ppc_r5);
357 ppc_mr (code, ppc_r4, ppc_r0); /* caller ip */
358 /* pointer to the saved fp regs */
359 pos = alloc_size - sizeof (double) * MONO_SAVED_FREGS;
360 ppc_addi (code, ppc_r7, ppc_sp, pos);
361 /* pointer to the saved int regs */
362 pos -= sizeof (gulong) * MONO_SAVED_GREGS;
363 ppc_addi (code, ppc_r6, ppc_sp, pos);
364 ppc_li (code, ppc_r8, rethrow);
366 ppc_load (code, ppc_r0, throw_exception);
367 ppc_mtctr (code, ppc_r0);
368 ppc_bcctrl (code, PPC_BR_ALWAYS, 0);
369 /* we should never reach this breakpoint */
371 g_assert ((code - start) < size);
372 mono_arch_flush_icache (start, code - start);
377 * mono_arch_get_rethrow_exception:
379 * Returns a function pointer which can be used to rethrow
380 * exceptions. The returned function has the following
381 * signature: void (*func) (MonoException *exc);
385 mono_arch_get_rethrow_exception (void)
387 static guint8 *start = NULL;
388 static int inited = 0;
392 start = mono_global_codeman_reserve (132);
393 mono_arch_get_throw_exception_generic (start, 132, FALSE, TRUE);
398 * arch_get_throw_exception:
400 * Returns a function pointer which can be used to raise
401 * exceptions. The returned function has the following
402 * signature: void (*func) (MonoException *exc);
403 * For example to raise an arithmetic exception you can use:
405 * x86_push_imm (code, mono_get_exception_arithmetic ());
406 * x86_call_code (code, arch_get_throw_exception ());
410 mono_arch_get_throw_exception (void)
412 static guint8 *start = NULL;
413 static int inited = 0;
417 start = mono_global_codeman_reserve (132);
418 mono_arch_get_throw_exception_generic (start, 132, FALSE, FALSE);
424 * arch_get_throw_exception_by_name:
426 * Returns a function pointer which can be used to raise
427 * corlib exceptions. The returned function has the following
428 * signature: void (*func) (char *exc_name);
429 * For example to raise an arithmetic exception you can use:
431 * x86_push_imm (code, "ArithmeticException");
432 * x86_call_code (code, arch_get_throw_exception_by_name ());
436 mono_arch_get_throw_exception_by_name (void)
438 static guint8 *start = NULL;
439 static int inited = 0;
443 start = mono_global_codeman_reserve (168);
444 mono_arch_get_throw_exception_generic (start, 168, TRUE, FALSE);
450 glist_to_array (GList *list, MonoClass *eclass)
452 MonoDomain *domain = mono_domain_get ();
459 len = g_list_length (list);
460 res = mono_array_new (domain, eclass, len);
462 for (i = 0; list; list = list->next, i++)
463 mono_array_set (res, gpointer, i, list->data);
468 /* mono_arch_find_jit_info:
470 * This function is used to gather information from @ctx. It return the
471 * MonoJitInfo of the corresponding function, unwinds one stack frame and
472 * stores the resulting context into @new_ctx. It also stores a string
473 * describing the stack location into @trace (if not NULL), and modifies
474 * the @lmf if necessary. @native_offset return the IP offset from the
475 * start of the function or -1 if that info is not available.
478 mono_arch_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji,
479 MonoContext *ctx, MonoContext *new_ctx, char **trace, MonoLMF **lmf,
480 int *native_offset, gboolean *managed)
483 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
484 MonoPPCStackFrame *sframe;
486 /* Avoid costly table lookup during stack overflow */
487 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
490 ji = mono_jit_info_table_find (domain, ip);
506 setup_context (new_ctx);
508 if (*lmf && (MONO_CONTEXT_GET_BP (ctx) >= (gpointer)(*lmf)->ebp)) {
509 /* remove any unused lmf */
510 *lmf = (*lmf)->previous_lmf;
513 address = (char *)ip - (char *)ji->code_start;
516 *native_offset = address;
519 if (!ji->method->wrapper_type)
523 *trace = mono_debug_print_stack_frame (ji->method, offset, domain);
525 sframe = (MonoPPCStackFrame*)MONO_CONTEXT_GET_BP (ctx);
526 MONO_CONTEXT_SET_BP (new_ctx, sframe->sp);
527 if (ji->method->save_lmf) {
528 memcpy (&new_ctx->fregs, (char*)sframe->sp - sizeof (double) * MONO_SAVED_FREGS, sizeof (double) * MONO_SAVED_FREGS);
529 memcpy (&new_ctx->regs, (char*)sframe->sp - sizeof (double) * MONO_SAVED_FREGS - sizeof (gulong) * MONO_SAVED_GREGS, sizeof (gulong) * MONO_SAVED_GREGS);
530 } else if (ji->used_regs) {
531 /* keep updated with emit_prolog in mini-ppc.c */
533 /* FIXME handle floating point args
534 for (i = 31; i >= 14; --i) {
535 if (ji->used_fregs & (1 << i)) {
536 offset += sizeof (double);
537 new_ctx->fregs [i - 14] = *(gulong*)((char*)sframe->sp - offset);
540 for (i = 31; i >= 13; --i) {
541 if (ji->used_regs & (1 << i)) {
542 offset += sizeof (gulong);
543 new_ctx->regs [i - 13] = *(gulong*)((char*)sframe->sp - offset);
547 /* the calling IP is in the parent frame */
548 sframe = (MonoPPCStackFrame*)sframe->sp;
549 /* we substract 4, so that the IP points into the call instruction */
550 MONO_CONTEXT_SET_IP (new_ctx, sframe->lr - 4);
556 setup_context (new_ctx);
562 char *fname = mono_method_full_name ((*lmf)->method, TRUE);
563 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
567 if ((ji = mono_jit_info_table_find (domain, (gpointer)(*lmf)->eip))) {
569 memset (res, 0, sizeof (MonoJitInfo));
570 res->method = (*lmf)->method;
573 /*sframe = (MonoPPCStackFrame*)MONO_CONTEXT_GET_BP (ctx);
574 MONO_CONTEXT_SET_BP (new_ctx, sframe->sp);
575 MONO_CONTEXT_SET_IP (new_ctx, sframe->lr);*/
576 MONO_CONTEXT_SET_BP (new_ctx, (*lmf)->ebp);
577 MONO_CONTEXT_SET_IP (new_ctx, (*lmf)->eip);
578 memcpy (&new_ctx->regs, (*lmf)->iregs, sizeof (gulong) * MONO_SAVED_GREGS);
579 memcpy (&new_ctx->fregs, (*lmf)->fregs, sizeof (double) * MONO_SAVED_FREGS);
580 *lmf = (*lmf)->previous_lmf;
582 return ji ? ji : res;
589 mono_jit_walk_stack (MonoStackWalk func, gboolean do_il_offset, gpointer user_data) {
590 MonoDomain *domain = mono_domain_get ();
591 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
592 MonoLMF *lmf = jit_tls->lmf;
593 MonoJitInfo *ji, rji;
594 gint native_offset, il_offset;
596 MonoPPCStackFrame *sframe;
598 MonoContext ctx, new_ctx;
600 setup_context (&ctx);
601 setup_context (&new_ctx);
604 __asm__ volatile("lwz %0,0(r1)" : "=r" (sframe));
606 __asm__ volatile("lwz %0,0(1)" : "=r" (sframe));
608 //MONO_CONTEXT_SET_IP (&ctx, sframe->lr);
609 MONO_CONTEXT_SET_BP (&ctx, sframe->sp);
610 sframe = (MonoPPCStackFrame*)sframe->sp;
611 MONO_CONTEXT_SET_IP (&ctx, sframe->lr);
613 while (MONO_CONTEXT_GET_BP (&ctx) < jit_tls->end_of_stack) {
615 ji = mono_arch_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
618 if (ji == (gpointer)-1)
622 MonoDebugSourceLocation *source;
624 source = mono_debug_lookup_source_location (ji->method, native_offset, domain);
625 il_offset = source ? source->il_offset : -1;
626 mono_debug_free_source_location (source);
630 if (func (ji->method, native_offset, il_offset, managed, user_data))
634 setup_context (&ctx);
639 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
640 MonoReflectionMethod **method,
641 gint32 *iloffset, gint32 *native_offset,
642 MonoString **file, gint32 *line, gint32 *column)
644 MonoDomain *domain = mono_domain_get ();
645 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
646 MonoLMF *lmf = jit_tls->lmf;
647 MonoJitInfo *ji, rji;
648 MonoContext ctx, new_ctx;
649 MonoPPCStackFrame *sframe;
650 MonoDebugSourceLocation *location;
653 __asm__ volatile("lwz %0,0(r1)" : "=r" (sframe));
655 __asm__ volatile("lwz %0,0(1)" : "=r" (sframe));
657 MONO_CONTEXT_SET_BP (&ctx, sframe->sp);
658 sframe = (MonoPPCStackFrame*)sframe->sp;
659 MONO_CONTEXT_SET_IP (&ctx, sframe->lr);
660 /*MONO_CONTEXT_SET_IP (&ctx, ves_icall_get_frame_info);
661 MONO_CONTEXT_SET_BP (&ctx, __builtin_frame_address (0));*/
666 ji = mono_arch_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, native_offset, NULL);
670 if (!ji || ji == (gpointer)-1 || MONO_CONTEXT_GET_BP (&ctx) >= jit_tls->end_of_stack)
673 /* skip all wrappers ??*/
674 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
675 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
676 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
677 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
678 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE)
685 *method = mono_method_get_object (domain, ji->method, NULL);
687 location = mono_debug_lookup_source_location (ji->method, *native_offset, domain);
689 *iloffset = location->il_offset;
693 if (need_file_info) {
695 *file = mono_string_new (domain, location->source_file);
696 *line = location->row;
697 *column = location->column;
704 mono_debug_free_source_location (location);
710 * This is the function called from the signal handler
713 mono_arch_sigctx_to_monoctx (void *ctx, MonoContext *mctx)
715 os_ucontext *uc = ctx;
717 mctx->sc_ir = UCONTEXT_REG_NIP(uc);
718 mctx->sc_sp = UCONTEXT_REG_Rn(uc, 1);
719 memcpy (&mctx->regs, &UCONTEXT_REG_Rn(uc, 13), sizeof (gulong) * MONO_SAVED_GREGS);
720 memcpy (&mctx->fregs, &UCONTEXT_REG_FPRn(uc, 14), sizeof (double) * MONO_SAVED_FREGS);
724 mono_arch_monoctx_to_sigctx (MonoContext *mctx, void *ctx)
726 os_ucontext *uc = ctx;
728 UCONTEXT_REG_NIP(uc) = mctx->sc_ir;
729 UCONTEXT_REG_Rn(uc, 1) = mctx->sc_sp;
730 memcpy (&UCONTEXT_REG_Rn(uc, 13), &mctx->regs, sizeof (gulong) * MONO_SAVED_GREGS);
731 memcpy (&UCONTEXT_REG_FPRn(uc, 14), &mctx->fregs, sizeof (double) * MONO_SAVED_FREGS);
735 mono_arch_ip_from_context (void *sigctx)
737 os_ucontext *uc = sigctx;
738 return (gpointer)UCONTEXT_REG_NIP(uc);
743 altstack_handle_and_restore (void *sigctx, gpointer obj, gboolean test_only)
745 void (*restore_context) (MonoContext *);
748 restore_context = mono_arch_get_restore_context ();
749 mono_arch_sigctx_to_monoctx (sigctx, &mctx);
750 arch_handle_exception (&mctx, obj, test_only);
751 restore_context (&mctx);
755 mono_arch_handle_altstack_exception (void *sigctx, gpointer fault_addr, gboolean stack_ovf)
757 #ifdef MONO_ARCH_USE_SIGACTION
758 ucontext_t *uc = (ucontext_t*)sigctx;
760 MonoJitInfo *ji = mono_jit_info_table_find (mono_domain_get (), mono_arch_ip_from_context (sigctx));
766 /* we don't do much now, but we can warn the user with a useful message */
767 fprintf (stderr, "Stack overflow: IP: %p, SP: %p\n", mono_arch_ip_from_context (sigctx), (gpointer)UCONTEXT_REG_Rn(uc, 1));
768 if (ji && ji->method)
769 method = mono_method_full_name (ji->method, TRUE);
771 method = "Unmanaged";
772 fprintf (stderr, "At %s\n", method);
776 mono_handle_native_sigsegv (SIGSEGV, sigctx);
777 /* setup a call frame on the real stack so that control is returned there
778 * and exception handling can continue.
779 * The frame looks like:
782 * 224 is the size of the red zone
784 frame_size = sizeof (ucontext_t) + sizeof (gpointer) * 16 + 224;
787 sp = (gpointer)(UCONTEXT_REG_Rn(uc, 1) & ~15);
788 sp = (gpointer)((char*)sp - frame_size);
789 /* may need to adjust pointers in the new struct copy, depending on the OS */
790 uc_copy = (ucontext_t*)(sp + 16);
791 memcpy (uc_copy, uc, sizeof (os_ucontext));
793 uc_copy->uc_mcontext.uc_regs = (char*)uc_copy + ((char*)uc->uc_mcontext.uc_regs - (char*)uc);
795 /* at the return form the signal handler execution starts in altstack_handle_and_restore() */
796 UCONTEXT_REG_LNK(uc) = UCONTEXT_REG_NIP(uc);
797 UCONTEXT_REG_NIP(uc) = (unsigned long)altstack_handle_and_restore;
798 UCONTEXT_REG_Rn(uc, 1) = (unsigned long)sp;
799 UCONTEXT_REG_Rn(uc, PPC_FIRST_ARG_REG) = (unsigned long)(sp + 16);
800 UCONTEXT_REG_Rn(uc, PPC_FIRST_ARG_REG + 1) = 0;
801 UCONTEXT_REG_Rn(uc, PPC_FIRST_ARG_REG + 2) = 0;
808 mono_arch_handle_exception (void *ctx, gpointer obj, gboolean test_only)
813 mono_arch_sigctx_to_monoctx (ctx, &mctx);
815 result = arch_handle_exception (&mctx, obj, test_only);
816 /* restore the context so that returning from the signal handler will invoke
819 mono_arch_monoctx_to_sigctx (&mctx, ctx);
824 * arch_handle_exception:
825 * @ctx: saved processor state
826 * @obj: the exception object
827 * @test_only: only test if the exception is caught, but dont call handlers
832 arch_handle_exception (MonoContext *ctx, gpointer obj, gboolean test_only)
834 MonoDomain *domain = mono_domain_get ();
835 MonoJitInfo *ji, rji;
836 static int (*call_filter) (MonoContext *, gpointer, gpointer) = NULL;
837 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
838 MonoLMF *lmf = jit_tls->lmf;
839 GList *trace_ips = NULL;
840 MonoException *mono_ex;
841 MonoArray *initial_trace_ips = NULL;
843 gboolean has_dynamic_methods = FALSE;
845 g_assert (ctx != NULL);
847 MonoException *ex = mono_get_exception_null_reference ();
848 ex->message = mono_string_new (domain,
849 "Object reference not set to an instance of an object");
850 obj = (MonoObject *)ex;
853 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
854 mono_ex = (MonoException*)obj;
855 initial_trace_ips = mono_ex->trace_ips;
862 call_filter = arch_get_call_filter ();
864 g_assert (jit_tls->end_of_stack);
865 g_assert (jit_tls->abort_func);
868 MonoContext ctx_cp = *ctx;
869 setup_context (&ctx_cp);
870 if (mono_jit_trace_calls != NULL)
871 g_print ("EXCEPTION handling: %s\n", mono_object_class (obj)->name);
872 if (!arch_handle_exception (&ctx_cp, obj, TRUE)) {
873 if (mono_break_on_exc)
875 mono_unhandled_exception (obj);
879 memset (&rji, 0, sizeof (rji));
884 setup_context (&new_ctx);
885 ji = mono_arch_find_jit_info (domain, jit_tls, &rji, &rji, ctx, &new_ctx,
886 NULL, &lmf, NULL, NULL);
888 g_warning ("Exception inside function without unwind info");
889 g_assert_not_reached ();
892 if (ji != (gpointer)-1) {
895 if (test_only && ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
897 * Avoid overwriting the stack trace if the exception is
898 * rethrown. Also avoid giant stack traces during a stack
901 if (!initial_trace_ips && (frame_count < 1000)) {
902 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
907 if (ji->method->dynamic)
908 has_dynamic_methods = TRUE;
910 if (ji->num_clauses) {
913 g_assert (ji->clauses);
915 for (i = 0; i < ji->num_clauses; i++) {
916 MonoJitExceptionInfo *ei = &ji->clauses [i];
917 gboolean filtered = FALSE;
919 if (ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
920 MONO_CONTEXT_GET_IP (ctx) <= ei->try_end) {
923 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER)) {
924 /* store the exception object int cfg->excvar */
925 g_assert (ei->exvar_offset);
926 /* need to use the frame pointer (ppc_r31), not r1 (regs start from register r13): methods with clauses always have r31 */
927 *((gpointer *)((char *)(ctx->regs [ppc_r31-13]) + ei->exvar_offset)) = obj;
930 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER)
931 filtered = call_filter (ctx, ei->data.filter, mono_ex);
933 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
934 mono_object_isinst (obj, ei->data.catch_class)) || filtered) {
936 if (mono_ex && !initial_trace_ips) {
937 trace_ips = g_list_reverse (trace_ips);
938 mono_ex->trace_ips = glist_to_array (trace_ips, mono_defaults.int_class);
939 if (has_dynamic_methods)
940 /* These methods could go away anytime, so compute the stack trace now */
941 mono_ex->stack_trace = ves_icall_System_Exception_get_trace (mono_ex);
943 g_list_free (trace_ips);
946 if (mono_jit_trace_calls != NULL)
947 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
948 /*printf ("stack for catch: %p\n", MONO_CONTEXT_GET_BP (ctx));*/
949 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
953 if (!test_only && ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
954 MONO_CONTEXT_GET_IP (ctx) < ei->try_end &&
955 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
956 if (mono_jit_trace_calls != NULL)
957 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
958 call_filter (ctx, ei->handler_start, NULL);
960 if (!test_only && ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
961 MONO_CONTEXT_GET_IP (ctx) < ei->try_end &&
962 (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
963 if (mono_jit_trace_calls != NULL)
964 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
965 call_filter (ctx, ei->handler_start, NULL);
976 if ((ji == (gpointer)-1) || MONO_CONTEXT_GET_BP (ctx) >= jit_tls->end_of_stack) {
979 jit_tls->abort_func (obj);
980 g_assert_not_reached ();
982 if (mono_ex && !initial_trace_ips) {
983 trace_ips = g_list_reverse (trace_ips);
984 mono_ex->trace_ips = glist_to_array (trace_ips, mono_defaults.int_class);
985 if (has_dynamic_methods)
986 /* These methods could go away anytime, so compute the stack trace now */
987 mono_ex->stack_trace = ves_icall_System_Exception_get_trace (mono_ex);
989 g_list_free (trace_ips);
995 g_assert_not_reached ();
999 mono_arch_has_unwind_info (gconstpointer addr)