1 /*------------------------------------------------------------------*/
3 /* Name - exceptions-s390.c */
5 /* Function - Exception support for S/390. */
7 /* Name - Neale Ferguson (Neale.Ferguson@SoftwareAG-usa.com) */
9 /* Date - January, 2004 */
11 /* Derivation - From exceptions-x86 & exceptions-ppc */
12 /* Paolo Molaro (lupus@ximian.com) */
13 /* Dietmar Maurer (dietmar@ximian.com) */
15 /* Copyright - 2001 Ximian, Inc. */
17 /*------------------------------------------------------------------*/
19 /*------------------------------------------------------------------*/
21 /*------------------------------------------------------------------*/
23 #define S390_CALLFILTER_INTREGS S390_MINIMAL_STACK_SIZE
24 #define S390_CALLFILTER_FLTREGS (S390_CALLFILTER_INTREGS+(16*sizeof(gulong)))
25 #define S390_CALLFILTER_ACCREGS (S390_CALLFILTER_FLTREGS+(16*sizeof(gdouble)))
26 #define S390_CALLFILTER_SIZE (S390_CALLFILTER_ACCREGS+(16*sizeof(gint32)))
28 #define S390_THROWSTACK_ACCPRM S390_MINIMAL_STACK_SIZE
29 #define S390_THROWSTACK_FPCPRM (S390_THROWSTACK_ACCPRM+sizeof(gpointer))
30 #define S390_THROWSTACK_RETHROW (S390_THROWSTACK_FPCPRM+sizeof(gulong))
31 #define S390_THROWSTACK_INTREGS (S390_THROWSTACK_RETHROW+sizeof(gboolean))
32 #define S390_THROWSTACK_FLTREGS (S390_THROWSTACK_INTREGS+(16*sizeof(gulong)))
33 #define S390_THROWSTACK_ACCREGS (S390_THROWSTACK_FLTREGS+(16*sizeof(gdouble)))
34 #define S390_THROWSTACK_SIZE (S390_THROWSTACK_ACCREGS+(16*sizeof(gint32)))
38 #define setup_context(ctx)
40 /*========================= End of Defines =========================*/
42 /*------------------------------------------------------------------*/
44 /*------------------------------------------------------------------*/
52 #include <mono/arch/s390x/s390x-codegen.h>
53 #include <mono/metadata/appdomain.h>
54 #include <mono/metadata/tabledefs.h>
55 #include <mono/metadata/threads.h>
56 #include <mono/metadata/debug-helpers.h>
57 #include <mono/metadata/exception.h>
58 #include <mono/metadata/mono-debug.h>
61 #include "mini-s390x.h"
63 /*========================= End of Includes ========================*/
65 /*------------------------------------------------------------------*/
66 /* P r o t o t y p e s */
67 /*------------------------------------------------------------------*/
69 static void throw_exception (MonoObject *, unsigned long, unsigned long,
70 gulong *, gdouble *, gint32 *, guint, gboolean);
71 static gpointer mono_arch_get_throw_exception_generic (int, MonoTrampInfo **,
72 int, gboolean, gboolean);
73 static void handle_signal_exception (gpointer);
75 /*========================= End of Prototypes ======================*/
77 /*------------------------------------------------------------------*/
78 /* G l o b a l V a r i a b l e s */
79 /*------------------------------------------------------------------*/
86 /*====================== End of Global Variables ===================*/
88 /*------------------------------------------------------------------*/
90 /* Name - mono_arch_get_call_filter */
92 /* Function - Return a pointer to a method which calls an */
93 /* exception filter. We also use this function to */
94 /* call finally handlers (we pass NULL as @exc */
95 /* object in this case). */
97 /*------------------------------------------------------------------*/
100 mono_arch_get_call_filter (MonoTrampInfo **info, gboolean aot)
102 static guint8 *start;
103 static int inited = 0;
105 int alloc_size, pos, i;
106 GSList *unwind_ops = NULL;
107 MonoJumpInfo *ji = NULL;
115 /* call_filter (MonoContext *ctx, unsigned long eip, gpointer exc) */
116 code = start = mono_global_codeman_reserve (512);
118 s390_stmg (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
119 s390_lgr (code, s390_r14, STK_BASE);
120 alloc_size = S390_ALIGN(S390_CALLFILTER_SIZE, S390_STACK_ALIGNMENT);
121 s390_aghi (code, STK_BASE, -alloc_size);
122 s390_stg (code, s390_r14, 0, STK_BASE, 0);
124 /*------------------------------------------------------*/
125 /* save general registers on stack */
126 /*------------------------------------------------------*/
127 s390_stmg (code, s390_r0, STK_BASE, STK_BASE, S390_CALLFILTER_INTREGS);
129 /*------------------------------------------------------*/
130 /* save floating point registers on stack */
131 /*------------------------------------------------------*/
132 pos = S390_CALLFILTER_FLTREGS;
133 for (i = 0; i < 16; ++i) {
134 s390_std (code, i, 0, STK_BASE, pos);
135 pos += sizeof (gdouble);
138 /*------------------------------------------------------*/
139 /* save access registers on stack */
140 /*------------------------------------------------------*/
141 s390_stam (code, s390_a0, s390_a15, STK_BASE, S390_CALLFILTER_ACCREGS);
143 /*------------------------------------------------------*/
145 /*------------------------------------------------------*/
146 s390_lgr (code, s390_r13, s390_r2);
148 /*------------------------------------------------------*/
149 /* Get A(Handler Entry Point) */
150 /*------------------------------------------------------*/
151 s390_lgr (code, s390_r0, s390_r3);
153 /*------------------------------------------------------*/
154 /* Set parameter register with Exception */
155 /*------------------------------------------------------*/
156 s390_lgr (code, s390_r2, s390_r4);
158 /*------------------------------------------------------*/
159 /* Load all registers with values from the context */
160 /*------------------------------------------------------*/
161 s390_lmg (code, s390_r3, s390_r12, s390_r13,
162 G_STRUCT_OFFSET(MonoContext, uc_mcontext.gregs[3]));
163 pos = G_STRUCT_OFFSET(MonoContext, uc_mcontext.fpregs.fprs[0]);
164 for (i = 0; i < 16; ++i) {
165 s390_ld (code, i, 0, s390_r13, pos);
166 pos += sizeof(gdouble);
170 /*------------------------------------------------------*/
171 /* We need to preserve current SP before calling filter */
172 /* with SP from the context */
173 /*------------------------------------------------------*/
174 s390_lgr (code, s390_r14, STK_BASE);
175 s390_lg (code, STK_BASE, 0, s390_r13,
176 G_STRUCT_OFFSET(MonoContext, uc_mcontext.gregs[15]));
177 s390_lgr (code, s390_r13, s390_r14);
180 /*------------------------------------------------------*/
182 /*------------------------------------------------------*/
183 s390_lgr (code, s390_r1, s390_r0);
184 s390_basr (code, s390_r14, s390_r1);
186 /*------------------------------------------------------*/
187 /* Save return value */
188 /*------------------------------------------------------*/
189 s390_lgr (code, s390_r14, s390_r2);
192 /*------------------------------------------------------*/
193 /* Reload our stack register with value saved in context*/
194 /*------------------------------------------------------*/
195 s390_lgr (code, STK_BASE, s390_r13);
198 /*------------------------------------------------------*/
199 /* Restore all the regs from the stack */
200 /*------------------------------------------------------*/
201 s390_lmg (code, s390_r0, s390_r13, STK_BASE, S390_CALLFILTER_INTREGS);
202 pos = S390_CALLFILTER_FLTREGS;
203 for (i = 0; i < 16; ++i) {
204 s390_ld (code, i, 0, STK_BASE, pos);
205 pos += sizeof (gdouble);
208 s390_lgr (code, s390_r2, s390_r14);
209 s390_lam (code, s390_a0, s390_a15, STK_BASE, S390_CALLFILTER_ACCREGS);
210 s390_aghi (code, s390_r15, alloc_size);
211 s390_lmg (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
212 s390_br (code, s390_r14);
214 g_assert ((code - start) < SZ_THROW);
216 mono_arch_flush_icache(start, code - start);
217 mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_EXCEPTION_HANDLING, NULL);
220 *info = mono_tramp_info_create ("call_filter",
221 start, code - start, ji,
227 /*========================= End of Function ========================*/
229 /*------------------------------------------------------------------*/
231 /* Name - throw_exception. */
233 /* Function - Raise an exception based on the parameters passed.*/
235 /*------------------------------------------------------------------*/
238 throw_exception (MonoObject *exc, unsigned long ip, unsigned long sp,
239 gulong *int_regs, gdouble *fp_regs, gint32 *acc_regs,
240 guint fpc, gboolean rethrow)
245 memset(&ctx, 0, sizeof(ctx));
249 /* adjust eip so that it point into the call instruction */
252 for (iReg = 0; iReg < 16; iReg++) {
253 ctx.uc_mcontext.gregs[iReg] = int_regs[iReg];
254 ctx.uc_mcontext.fpregs.fprs[iReg].d = fp_regs[iReg];
255 ctx.uc_mcontext.aregs[iReg] = acc_regs[iReg];
258 ctx.uc_mcontext.fpregs.fpc = fpc;
260 MONO_CONTEXT_SET_BP (&ctx, sp);
261 MONO_CONTEXT_SET_IP (&ctx, ip);
263 if (mono_object_isinst (exc, mono_defaults.exception_class)) {
264 MonoException *mono_ex = (MonoException*)exc;
266 mono_ex->stack_trace = NULL;
267 mono_ex->trace_ips = NULL;
270 // mono_arch_handle_exception (&ctx, exc, FALSE);
271 mono_handle_exception (&ctx, exc);
272 mono_restore_context(&ctx);
274 g_assert_not_reached ();
277 /*========================= End of Function ========================*/
279 /*------------------------------------------------------------------*/
281 /* Name - get_throw_exception_generic */
283 /* Function - Return a function pointer which can be used to */
284 /* raise exceptions. The returned function has the */
285 /* following signature: */
286 /* void (*func) (MonoException *exc); or, */
287 /* void (*func) (char *exc_name); */
289 /*------------------------------------------------------------------*/
292 mono_arch_get_throw_exception_generic (int size, MonoTrampInfo **info,
293 int corlib, gboolean rethrow, gboolean aot)
295 guint8 *code, *start;
296 int alloc_size, pos, i;
297 MonoJumpInfo *ji = NULL;
298 GSList *unwind_ops = NULL;
300 code = start = mono_global_codeman_reserve(size);
302 s390_stmg (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
303 alloc_size = S390_ALIGN(S390_THROWSTACK_SIZE, S390_STACK_ALIGNMENT);
304 s390_lgr (code, s390_r14, STK_BASE);
305 s390_aghi (code, STK_BASE, -alloc_size);
306 s390_stg (code, s390_r14, 0, STK_BASE, 0);
307 s390_lgr (code, s390_r3, s390_r2);
309 s390_basr (code, s390_r13, 0);
311 s390_llong(code, mono_defaults.exception_class->image);
312 s390_llong(code, mono_exception_from_token);
313 s390_lg (code, s390_r2, 0, s390_r13, 4);
314 s390_lg (code, s390_r1, 0, s390_r13, 12);
315 s390_basr (code, s390_r14, s390_r1);
318 /*------------------------------------------------------*/
319 /* save the general registers on the stack */
320 /*------------------------------------------------------*/
321 s390_stmg (code, s390_r0, s390_r13, STK_BASE, S390_THROWSTACK_INTREGS);
323 s390_lgr (code, s390_r1, STK_BASE);
324 s390_aghi (code, s390_r1, alloc_size);
325 /*------------------------------------------------------*/
326 /* save the return address in the parameter register */
327 /*------------------------------------------------------*/
328 s390_lg (code, s390_r3, 0, s390_r1, S390_RET_ADDR_OFFSET);
330 /*------------------------------------------------------*/
331 /* save the floating point registers */
332 /*------------------------------------------------------*/
333 pos = S390_THROWSTACK_FLTREGS;
334 for (i = 0; i < 16; ++i) {
335 s390_std (code, i, 0, STK_BASE, pos);
336 pos += sizeof (gdouble);
338 /*------------------------------------------------------*/
339 /* save the access registers */
340 /*------------------------------------------------------*/
341 s390_stam (code, s390_r0, s390_r15, STK_BASE, S390_THROWSTACK_ACCREGS);
343 /*------------------------------------------------------*/
344 /* call throw_exception (tkn, ip, sp, gr, fr, ar, re) */
345 /* - r2 already contains *exc */
346 /*------------------------------------------------------*/
347 s390_lgr (code, s390_r4, s390_r1); /* caller sp */
349 /*------------------------------------------------------*/
350 /* pointer to the saved int regs */
351 /*------------------------------------------------------*/
352 s390_la (code, s390_r5, 0, STK_BASE, S390_THROWSTACK_INTREGS);
353 s390_la (code, s390_r6, 0, STK_BASE, S390_THROWSTACK_FLTREGS);
354 s390_la (code, s390_r7, 0, STK_BASE, S390_THROWSTACK_ACCREGS);
355 s390_stg (code, s390_r7, 0, STK_BASE, S390_THROWSTACK_ACCPRM);
356 s390_stfpc(code, STK_BASE, S390_THROWSTACK_FPCPRM+4);
357 s390_lghi (code, s390_r7, rethrow);
358 s390_stg (code, s390_r7, 0, STK_BASE, S390_THROWSTACK_RETHROW);
359 s390_basr (code, s390_r13, 0);
361 s390_llong(code, throw_exception);
362 s390_lg (code, s390_r1, 0, s390_r13, 4);
363 s390_basr (code, s390_r14, s390_r1);
364 /* we should never reach this breakpoint */
366 g_assert ((code - start) < size);
368 mono_arch_flush_icache (start, code - start);
369 mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_EXCEPTION_HANDLING, NULL);
372 *info = mono_tramp_info_create (corlib ? "throw_corlib_exception"
373 : (rethrow ? "rethrow_exception"
374 : "throw_exception"),
375 start, code - start, ji, unwind_ops);
380 /*========================= End of Function ========================*/
382 /*------------------------------------------------------------------*/
384 /* Name - arch_get_throw_exception */
386 /* Function - Return a function pointer which can be used to */
387 /* raise exceptions. The returned function has the */
388 /* following signature: */
389 /* void (*func) (MonoException *exc); */
391 /*------------------------------------------------------------------*/
394 mono_arch_get_throw_exception (MonoTrampInfo **info, gboolean aot)
401 return (mono_arch_get_throw_exception_generic (SZ_THROW, info, FALSE, FALSE, aot));
404 /*========================= End of Function ========================*/
406 /*------------------------------------------------------------------*/
408 /* Name - arch_get_rethrow_exception */
410 /* Function - Return a function pointer which can be used to */
411 /* raise exceptions. The returned function has the */
412 /* following signature: */
413 /* void (*func) (MonoException *exc); */
415 /*------------------------------------------------------------------*/
418 mono_arch_get_rethrow_exception (MonoTrampInfo **info, gboolean aot)
424 return (mono_arch_get_throw_exception_generic (SZ_THROW, info, FALSE, TRUE, aot));
427 /*========================= End of Function ========================*/
429 /*------------------------------------------------------------------*/
431 /* Name - arch_get_corlib_exception */
433 /* Function - Return a function pointer which can be used to */
434 /* raise corlib exceptions. The return function has */
435 /* the following signature: */
436 /* void (*func) (guint32 token, guint32 offset) */
438 /*------------------------------------------------------------------*/
441 mono_arch_get_throw_corlib_exception (MonoTrampInfo **info, gboolean aot)
447 return (mono_arch_get_throw_exception_generic (SZ_THROW, info, TRUE, FALSE, aot));
450 /*========================= End of Function ========================*/
452 /*------------------------------------------------------------------*/
454 /* Name - mono_arch_unwind_frame */
456 /* Function - See exceptions-amd64.c for docs. */
458 /*------------------------------------------------------------------*/
461 mono_arch_unwind_frame (MonoDomain *domain, MonoJitTlsData *jit_tls,
462 MonoJitInfo *ji, MonoContext *ctx,
463 MonoContext *new_ctx, MonoLMF **lmf,
464 mgreg_t **save_locations,
465 StackFrameInfo *frame)
467 gpointer ip = (gpointer) MONO_CONTEXT_GET_IP (ctx);
469 memset (frame, 0, sizeof (StackFrameInfo));
477 guint32 unwind_info_len;
481 if (ji->is_trampoline)
482 frame->type = FRAME_TYPE_TRAMPOLINE;
484 frame->type = FRAME_TYPE_MANAGED;
486 unwind_info = mono_jinfo_get_unwind_info (ji, &unwind_info_len);
488 address = (char *)ip - (char *)ji->code_start;
490 memcpy(®s, &ctx->uc_mcontext.gregs, sizeof(regs));
491 mono_unwind_frame (unwind_info, unwind_info_len, ji->code_start,
492 (guint8 *) ji->code_start + ji->code_size,
493 ip, NULL, regs, 16, save_locations,
494 MONO_MAX_IREGS, &cfa);
495 memcpy (&new_ctx->uc_mcontext.gregs, ®s, sizeof(regs));
496 MONO_CONTEXT_SET_IP(new_ctx, regs[14] - 2);
497 MONO_CONTEXT_SET_BP(new_ctx, cfa);
502 ji = mini_jit_info_table_find (domain, (gpointer)(*lmf)->eip, NULL);
507 frame->method = (*lmf)->method;
511 frame->type = FRAME_TYPE_MANAGED_TO_NATIVE;
513 memcpy(new_ctx->uc_mcontext.gregs, (*lmf)->gregs, sizeof((*lmf)->gregs));
514 memcpy(new_ctx->uc_mcontext.fpregs.fprs, (*lmf)->fregs, sizeof((*lmf)->fregs));
515 MONO_CONTEXT_SET_BP (new_ctx, (*lmf)->ebp);
516 MONO_CONTEXT_SET_IP (new_ctx, (*lmf)->eip - 2);
517 *lmf = (*lmf)->previous_lmf;
525 /*========================= End of Function ========================*/
527 /*------------------------------------------------------------------*/
529 /* Name - handle_signal_exception */
531 /* Function - Handle an exception raised by the JIT code. */
533 /* Parameters - obj - The exception object */
535 /*------------------------------------------------------------------*/
538 handle_signal_exception (gpointer obj)
540 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
543 memcpy (&ctx, &jit_tls->ex_ctx, sizeof (MonoContext));
544 mono_handle_exception (&ctx, obj);
545 mono_restore_context (&ctx);
548 /*========================= End of Function ========================*/
550 /*------------------------------------------------------------------*/
552 /* Name - mono_arch_handle_exception */
554 /* Function - Handle an exception raised by the JIT code. */
556 /* Parameters - ctx - Saved processor state */
557 /* obj - The exception object */
559 /*------------------------------------------------------------------*/
562 mono_arch_handle_exception (void *sigctx, gpointer obj)
567 * Handling the exception in the signal handler is problematic, since the original
568 * signal is disabled, and we could run arbitrary code though the debugger. So
569 * resume into the normal stack and do most work there if possible.
571 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
573 /* Pass the ctx parameter in TLS */
574 mono_sigctx_to_monoctx (sigctx, &jit_tls->ex_ctx);
576 mctx = jit_tls->ex_ctx;
577 mono_arch_setup_async_callback (&mctx, handle_signal_exception, obj);
578 mono_monoctx_to_sigctx (&mctx, sigctx);
583 /*========================= End of Function ========================*/
585 /*------------------------------------------------------------------*/
587 /* Name - mono_arch_setup_async_callback */
589 /* Function - Establish the async callback. */
591 /* Parameters - ctx - Context */
592 /* async_cb - Callback routine address */
593 /* user_data - Data to be passed to callback */
595 /*------------------------------------------------------------------*/
598 mono_arch_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
600 uintptr_t sp = (uintptr_t) MONO_CONTEXT_GET_SP(ctx);
602 ctx->uc_mcontext.gregs[2] = (unsigned long) user_data;
604 sp -= S390_MINIMAL_STACK_SIZE;
605 *(unsigned long *)sp = MONO_CONTEXT_GET_SP(ctx);
606 MONO_CONTEXT_SET_BP(ctx, sp);
607 MONO_CONTEXT_SET_IP(ctx, (unsigned long) async_cb);
610 /*========================= End of Function ========================*/
612 /*------------------------------------------------------------------*/
614 /* Name - mono_arch_ip_from_context */
616 /* Function - Return the instruction pointer from the context. */
618 /* Parameters - sigctx - Saved processor state */
620 /*------------------------------------------------------------------*/
623 mono_arch_ip_from_context (void *sigctx)
625 return ((gpointer) MONO_CONTEXT_GET_IP(((MonoContext *) sigctx)));
629 /*========================= End of Function ========================*/
631 /*------------------------------------------------------------------*/
633 /* Name - mono_arch_get_restore_context */
635 /* Function - Return the address of the routine that will rest- */
636 /* ore the context. */
638 /*------------------------------------------------------------------*/
641 mono_arch_get_restore_context (MonoTrampInfo **info, gboolean aot)
650 /*========================= End of Function ========================*/
652 /*------------------------------------------------------------------*/
654 /* Name - mono_arch_is_int_overflow */
656 /* Function - Inspect the code that raised the SIGFPE signal */
657 /* to see if the DivideByZero or Arithmetic exception*/
658 /* should be raised. */
660 /*------------------------------------------------------------------*/
663 mono_arch_is_int_overflow (void *uc, void *info)
668 gboolean arithExc = TRUE;
673 ctx = (MonoContext *) uc;
674 code = (guint8 *) ((siginfo_t *)info)->si_addr;
675 /*----------------------------------------------------------*/
676 /* Divide operations are the only ones that will give the */
677 /* divide by zero exception so just check for these ops. */
678 /*----------------------------------------------------------*/
680 case 0x1d : /* Divide Register */
681 regNo = code[1] & 0x0f;
682 if (ctx->uc_mcontext.gregs[regNo] == 0)
685 case 0x5d : /* Divide */
686 regNo = (code[2] & 0xf0 >> 8);
687 idxNo = (code[1] & 0x0f);
688 offset = *((guint16 *) code+2) & 0x0fff;
689 operand = (guint64*)(ctx->uc_mcontext.gregs[regNo] + offset);
691 operand += ctx->uc_mcontext.gregs[idxNo];
695 case 0xb9 : /* DL[GR] or DS[GR] */
696 if ((code[1] == 0x97) || (code[1] == 0x87) ||
697 (code[1] == 0x0d) || (code[1] == 0x1d)) {
698 regNo = (code[3] & 0x0f);
699 if (ctx->uc_mcontext.gregs[regNo] == 0)
703 case 0xe3 : /* DL[G] | DS[G] */
704 if ((code[5] == 0x97) || (code[5] == 0x87) ||
705 (code[5] == 0x0d) || (code[5] == 0x1d)) {
706 regNo = (code[2] & 0xf0 >> 8);
707 idxNo = (code[1] & 0x0f);
708 offset = (code[2] & 0x0f << 8) +
709 code[3] + (code[4] << 12);
710 operand = (guint64*)(ctx->uc_mcontext.gregs[regNo] + offset);
712 operand += ctx->uc_mcontext.gregs[idxNo];
720 ctx->uc_mcontext.psw.addr = (guint64)code;
724 /*========================= End of Function ========================*/