mono/mini/exceptions-s390.c

   1 /*------------------------------------------------------------------*/
   2 /*                                                                  */
   3 /* Name        - exceptions-s390.c                                  */
   4 /*                                                                  */
   5 /* Function    - Exception support for S/390.                       */
   6 /*                                                                  */
   7 /* Name        - Neale Ferguson (Neale.Ferguson@SoftwareAG-usa.com) */
   8 /*                                                                  */
   9 /* Date        - January, 2004                                      */
  10 /*                                                                  */
  11 /* Derivation  - From exceptions-x86 & exceptions-ppc               */
  12 /*               Paolo Molaro (lupus@ximian.com)                    */
  13 /*               Dietmar Maurer (dietmar@ximian.com)                */
  14 /*                                                                  */
  15 /* Copyright   - 2001 Ximian, Inc.                                  */
  16 /*                                                                  */
  17 /*------------------------------------------------------------------*/
  18
  19 /*------------------------------------------------------------------*/
  20 /*                 D e f i n e s                                    */
  21 /*------------------------------------------------------------------*/
  22
  23 #define MONO_CONTEXT_SET_IP(ctx,ip)                                     \
  24         do {                                                            \
  25                 (ctx)->uc_mcontext.gregs[14] = (unsigned long)ip;       \
  26                 (ctx)->uc_mcontext.psw.addr = (unsigned long)ip;        \
  27         } while (0);
  28
  29 #define MONO_CONTEXT_SET_BP(ctx,bp)                                     \
  30         do {                                                            \
  31                 (ctx)->uc_mcontext.gregs[15] = (unsigned long)bp;       \
  32                 (ctx)->uc_stack.ss_sp        = (unsigned long)bp;       \
  33         } while (0);
  34
  35 #define MONO_CONTEXT_GET_IP(ctx) context_get_ip ((ctx))
  36 #define MONO_CONTEXT_GET_BP(ctx) ((gpointer)((ctx)->uc_mcontext.gregs[15]))
  37
  38 #define S390_CALLFILTER_INTREGS         S390_MINIMAL_STACK_SIZE
  39 #define S390_CALLFILTER_FLTREGS         S390_CALLFILTER_INTREGS+(16*sizeof(gulong))
  40 #define S390_CALLFILTER_ACCREGS         S390_CALLFILTER_FLTREGS+(16*sizeof(gdouble))
  41 #define S390_CALLFILTER_SIZE            (S390_CALLFILTER_ACCREGS+(16*sizeof(gulong)))
  42
  43 #define S390_THROWSTACK_ACCPRM          S390_MINIMAL_STACK_SIZE
  44 #define S390_THROWSTACK_FPCPRM          S390_THROWSTACK_ACCPRM+sizeof(gpointer)
  45 #define S390_THROWSTACK_RETHROW         S390_THROWSTACK_FPCPRM+sizeof(gulong)
  46 #define S390_THROWSTACK_INTREGS         S390_THROWSTACK_RETHROW+sizeof(gboolean)
  47 #define S390_THROWSTACK_FLTREGS         S390_THROWSTACK_INTREGS+(16*sizeof(gulong))
  48 #define S390_THROWSTACK_ACCREGS         S390_THROWSTACK_FLTREGS+(16*sizeof(gdouble))
  49 #define S390_THROWSTACK_SIZE            (S390_THROWSTACK_ACCREGS+(16*sizeof(gulong)))
  50
  51 /*========================= End of Defines =========================*/
  52
  53 /*------------------------------------------------------------------*/
  54 /*                 I n c l u d e s                                  */
  55 /*------------------------------------------------------------------*/
  56
  57 #include <config.h>
  58 #include <glib.h>
  59 #include <signal.h>
  60 #include <string.h>
  61 #include <ucontext.h>
  62
  63 #include <mono/arch/s390/s390-codegen.h>
  64 #include <mono/metadata/appdomain.h>
  65 #include <mono/metadata/tabledefs.h>
  66 #include <mono/metadata/threads.h>
  67 #include <mono/metadata/debug-helpers.h>
  68 #include <mono/metadata/exception.h>
  69 #include <mono/metadata/mono-debug.h>
  70
  71 #include "mini.h"
  72 #include "mini-s390.h"
  73
  74 /*========================= End of Includes ========================*/
  75
  76 /*------------------------------------------------------------------*/
  77 /*                 T y p e d e f s                                  */
  78 /*------------------------------------------------------------------*/
  79
  80 typedef struct
  81 {
  82   void *prev;
  83   void *unused[5];
  84   void *regs[8];
  85   void *return_address;
  86 } MonoS390StackFrame;
  87
  88 /*========================= End of Typedefs ========================*/
  89
  90 /*------------------------------------------------------------------*/
  91 /*                   P r o t o t y p e s                            */
  92 /*------------------------------------------------------------------*/
  93
  94 gboolean mono_arch_handle_exception (void     *ctx,
  95                                      gpointer obj,
  96                                      gboolean test_only);
  97
  98 /*========================= End of Prototypes ======================*/
  99
 100 /*------------------------------------------------------------------*/
 101 /*                 G l o b a l   V a r i a b l e s                  */
 102 /*------------------------------------------------------------------*/
 103
 104 /*====================== End of Global Variables ===================*/
 105
 106 /*------------------------------------------------------------------*/
 107 /*                                                                  */
 108 /* Name         - context_get_ip                                    */
 109 /*                                                                  */
 110 /* Function     - Extract the current instruction address from the  */
 111 /*                context.                                          */
 112 /*                                                                  */
 113 /*------------------------------------------------------------------*/
 114
 115 static inline gpointer
 116 context_get_ip (MonoContext *ctx)
 117 {
 118         gpointer ip;
 119
 120         ip = (gpointer) ((gint32) (ctx->uc_mcontext.psw.addr) & 0x7fffffff);
 121         return ip;
 122 }
 123
 124 /*========================= End of Function ========================*/
 125
 126 /*------------------------------------------------------------------*/
 127 /*                                                                  */
 128 /* Name         - mono_arch_has_unwind_info                         */
 129 /*                                                                  */
 130 /* Function     - Tests if a function has a DWARF exception table   */
 131 /*                that is able to restore all caller saved registers*/
 132 /*                                                                  */
 133 /*------------------------------------------------------------------*/
 134
 135 gboolean
 136 mono_arch_has_unwind_info (gconstpointer addr)
 137 {
 138         return FALSE;
 139 }
 140
 141 /*========================= End of Function ========================*/
 142
 143 /*------------------------------------------------------------------*/
 144 /*                                                                  */
 145 /* Name         - arch_get_call_filter                              */
 146 /*                                                                  */
 147 /* Function     - Return a pointer to a method which calls an       */
 148 /*                exception filter. We also use this function to    */
 149 /*                call finally handlers (we pass NULL as @exc       */
 150 /*                object in this case).                             */
 151 /*                                                                  */
 152 /*------------------------------------------------------------------*/
 153
 154 static gpointer
 155 arch_get_call_filter (void)
 156 {
 157         static guint8 start [512];
 158         static int inited = 0;
 159         guint8 *code;
 160         int alloc_size, pos, i;
 161
 162         if (inited)
 163                 return start;
 164
 165         inited = 1;
 166         /* call_filter (MonoContext *ctx, unsigned long eip, gpointer exc) */
 167         code = start;
 168
 169         s390_stm (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
 170         s390_lr  (code, s390_r14, STK_BASE);
 171         alloc_size = S390_ALIGN(S390_CALLFILTER_SIZE, S390_STACK_ALIGNMENT);
 172         s390_ahi (code, STK_BASE, -alloc_size);
 173         s390_st  (code, s390_r14, 0, STK_BASE, 0);
 174
 175         /*------------------------------------------------------*/
 176         /* save general registers on stack                      */
 177         /*------------------------------------------------------*/
 178         s390_stm (code, s390_r0, s390_r13, STK_BASE, S390_CALLFILTER_INTREGS);
 179
 180         /*------------------------------------------------------*/
 181         /* save floating point registers on stack               */
 182         /*------------------------------------------------------*/
 183 //      pos = S390_CALLFILTER_FLTREGS;
 184 //      for (i = 0; i < 16; ++i) {
 185 //              s390_std (code, i, 0, STK_BASE, pos);
 186 //              pos += sizeof (gdouble);
 187 //      }
 188
 189         /*------------------------------------------------------*/
 190         /* save access registers on stack                       */
 191         /*------------------------------------------------------*/
 192 //      s390_stam (code, s390_a0, s390_a15, STK_BASE, S390_CALLFILTER_ACCREGS);
 193
 194         /*------------------------------------------------------*/
 195         /* Get A(Context)                                       */
 196         /*------------------------------------------------------*/
 197         s390_lr   (code, s390_r13, s390_r2);
 198
 199         /*------------------------------------------------------*/
 200         /* Get A(Handler Entry Point)                           */
 201         /*------------------------------------------------------*/
 202         s390_lr   (code, s390_r0, s390_r3);
 203
 204         /*------------------------------------------------------*/
 205         /* Set parameter register with Exception                */
 206         /*------------------------------------------------------*/
 207         s390_lr   (code, s390_r2, s390_r4);
 208
 209         /*------------------------------------------------------*/
 210         /* Load all registers with values from the context      */
 211         /*------------------------------------------------------*/
 212         s390_lm   (code, s390_r3, s390_r12, s390_r13, G_STRUCT_OFFSET(MonoContext, uc_mcontext.gregs[3]));
 213         pos = G_STRUCT_OFFSET(MonoContext, uc_mcontext.fpregs.fprs[0]);
 214         for (i = 0; i < 16; ++i) {
 215                 s390_ld  (code, i, 0, s390_r13, pos);
 216                 pos += sizeof(gdouble);
 217         }
 218
 219         /*------------------------------------------------------*/
 220         /* Point at the copied stack frame and call the filter  */
 221         /*------------------------------------------------------*/
 222         s390_lr   (code, s390_r1, s390_r0);
 223         s390_basr (code, s390_r14, s390_r1);
 224
 225         /*------------------------------------------------------*/
 226         /* Save return value                                    */
 227         /*------------------------------------------------------*/
 228         s390_lr   (code, s390_r14, s390_r2);
 229
 230         /*------------------------------------------------------*/
 231         /* Restore all the regs from the stack                  */
 232         /*------------------------------------------------------*/
 233         s390_lm (code, s390_r0, s390_r13, STK_BASE, S390_CALLFILTER_INTREGS);
 234 //      pos = S390_CALLFILTER_FLTREGS;
 235 //      for (i = 0; i < 16; ++i) {
 236 //              s390_ld (code, i, 0, STK_BASE, pos);
 237 //              pos += sizeof (gdouble);
 238 //      }
 239
 240         s390_lr   (code, s390_r2, s390_r14);
 241 //      s390_lam  (code, s390_a0, s390_a15, STK_BASE, S390_CALLFILTER_ACCREGS);
 242         s390_ahi  (code, s390_r15, alloc_size);
 243         s390_lm   (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
 244         s390_br   (code, s390_r14);
 245
 246         g_assert ((code - start) < sizeof(start));
 247         return start;
 248 }
 249
 250 /*========================= End of Function ========================*/
 251
 252 /*------------------------------------------------------------------*/
 253 /*                                                                  */
 254 /* Name         - throw_exception.                                  */
 255 /*                                                                  */
 256 /* Function     - Raise an exception based on the parameters passed.*/
 257 /*                                                                  */
 258 /*------------------------------------------------------------------*/
 259
 260 static void
 261 throw_exception (MonoObject *exc, unsigned long ip, unsigned long sp,
 262                  gulong *int_regs, gdouble *fp_regs, gulong *acc_regs,
 263                  guint fpc, gboolean rethrow)
 264 {
 265         static void (*restore_context) (MonoContext *);
 266         MonoContext ctx;
 267         int iReg;
 268
 269         memset(&ctx, 0, sizeof(ctx));
 270
 271         getcontext(&ctx);
 272
 273         /* adjust eip so that it point into the call instruction */
 274         ip -= 6;
 275
 276         for (iReg = 0; iReg < 16; iReg++) {
 277                 ctx.uc_mcontext.gregs[iReg]         = int_regs[iReg];
 278                 ctx.uc_mcontext.fpregs.fprs[iReg].d = fp_regs[iReg];
 279                 ctx.uc_mcontext.aregs[iReg]         = acc_regs[iReg];
 280         }
 281
 282         ctx.uc_mcontext.fpregs.fpc = fpc;
 283
 284         MONO_CONTEXT_SET_BP (&ctx, sp);
 285         MONO_CONTEXT_SET_IP (&ctx, ip);
 286
 287         if (mono_object_isinst (exc, mono_defaults.exception_class)) {
 288                 MonoException *mono_ex = (MonoException*)exc;
 289                 if (!rethrow)
 290                         mono_ex->stack_trace = NULL;
 291         }
 292         mono_arch_handle_exception (&ctx, exc, FALSE);
 293         setcontext(&ctx);
 294
 295         g_assert_not_reached ();
 296 }
 297
 298 /*========================= End of Function ========================*/
 299
 300 /*------------------------------------------------------------------*/
 301 /*                                                                  */
 302 /* Name         - get_throw_exception_generic                       */
 303 /*                                                                  */
 304 /* Function     - Return a function pointer which can be used to    */
 305 /*                raise exceptions. The returned function has the   */
 306 /*                following signature:                              */
 307 /*                void (*func) (MonoException *exc); or,            */
 308 /*                void (*func) (char *exc_name);                    */
 309 /*                                                                  */
 310 /*------------------------------------------------------------------*/
 311
 312 static gpointer
 313 get_throw_exception_generic (guint8 *start, int size,
 314                              int by_name, gboolean rethrow)
 315 {
 316         guint8 *code;
 317         int alloc_size, pos, i, offset;
 318
 319         code = start;
 320
 321         s390_stm (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
 322         alloc_size = S390_ALIGN(S390_THROWSTACK_SIZE, S390_STACK_ALIGNMENT);
 323         s390_lr   (code, s390_r14, STK_BASE);
 324         s390_ahi  (code, STK_BASE, -alloc_size);
 325         s390_st   (code, s390_r14, 0, STK_BASE, 0);
 326         if (by_name) {
 327                 s390_lr   (code, s390_r4, s390_r2);
 328                 s390_bras (code, s390_r13, 6);
 329                 s390_word (code, mono_defaults.corlib);
 330                 s390_word (code, "System");
 331                 s390_l    (code, s390_r2, 0, s390_r13, 0);
 332                 s390_l    (code, s390_r3, 0, s390_r13, 4);
 333                 offset = (guint32) S390_RELATIVE(mono_exception_from_name, code);
 334                 s390_brasl(code, s390_r14, offset);
 335         }
 336         /*------------------------------------------------------*/
 337         /* save the general registers on the stack              */
 338         /*------------------------------------------------------*/
 339         s390_stm (code, s390_r0, s390_r13, STK_BASE, S390_THROWSTACK_INTREGS);
 340
 341         s390_lr  (code, s390_r1, STK_BASE);
 342         s390_ahi (code, s390_r1, alloc_size);
 343         /*------------------------------------------------------*/
 344         /* save the return address in the parameter register    */
 345         /*------------------------------------------------------*/
 346         s390_l   (code, s390_r3, 0, s390_r1, S390_RET_ADDR_OFFSET);
 347
 348         /*------------------------------------------------------*/
 349         /* save the floating point registers                    */
 350         /*------------------------------------------------------*/
 351         pos = S390_THROWSTACK_FLTREGS;
 352         for (i = 0; i < 16; ++i) {
 353                 s390_std (code, i, 0,STK_BASE, pos);
 354                 pos += sizeof (gdouble);
 355         }
 356         /*------------------------------------------------------*/
 357         /* save the access registers                            */
 358         /*------------------------------------------------------*/
 359         s390_stam (code, s390_r0, s390_r15, STK_BASE, S390_THROWSTACK_ACCREGS);
 360
 361         /*------------------------------------------------------*/
 362         /* call throw_exception (exc, ip, sp, gr, fr, ar)       */
 363         /* exc is already in place in r2                        */
 364         /*------------------------------------------------------*/
 365         s390_lr   (code, s390_r4, s390_r1);        /* caller sp */
 366         /*------------------------------------------------------*/
 367         /* pointer to the saved int regs                        */
 368         /*------------------------------------------------------*/
 369         s390_la   (code, s390_r5, 0, STK_BASE, S390_THROWSTACK_INTREGS);
 370         s390_la   (code, s390_r6, 0, STK_BASE, S390_THROWSTACK_FLTREGS);
 371         s390_la   (code, s390_r7, 0, STK_BASE, S390_THROWSTACK_ACCREGS);
 372         s390_st   (code, s390_r7, 0, STK_BASE, S390_THROWSTACK_ACCPRM);
 373         s390_stfpc(code, STK_BASE, S390_THROWSTACK_FPCPRM);
 374         s390_lhi  (code, s390_r7, rethrow);
 375         s390_st   (code, s390_r7, 0, STK_BASE, S390_THROWSTACK_RETHROW);
 376         offset = (guint32) S390_RELATIVE(throw_exception, code);
 377         s390_brasl(code, s390_r14, offset);
 378         /* we should never reach this breakpoint */
 379         s390_break (code);
 380         g_assert ((code - start) < size);
 381         return start;
 382 }
 383
 384 /*========================= End of Function ========================*/
 385
 386 /*------------------------------------------------------------------*/
 387 /*                                                                  */
 388 /* Name         - arch_get_throw_exception                          */
 389 /*                                                                  */
 390 /* Function     - Return a function pointer which can be used to    */
 391 /*                raise exceptions. The returned function has the   */
 392 /*                following signature:                              */
 393 /*                void (*func) (MonoException *exc);                */
 394 /*                                                                  */
 395 /*------------------------------------------------------------------*/
 396
 397 gpointer
 398 mono_arch_get_throw_exception (void)
 399 {
 400         static guint8 start [384];
 401         static int inited = 0;
 402
 403         if (inited)
 404                 return start;
 405         get_throw_exception_generic (start, sizeof (start), FALSE, FALSE);
 406         inited = 1;
 407         return start;
 408 }
 409
 410 /*========================= End of Function ========================*/
 411
 412 /*------------------------------------------------------------------*/
 413 /*                                                                  */
 414 /* Name         - arch_get_rethrow_exception                        */
 415 /*                                                                  */
 416 /* Function     - Return a function pointer which can be used to    */
 417 /*                raise exceptions. The returned function has the   */
 418 /*                following signature:                              */
 419 /*                void (*func) (MonoException *exc);                */
 420 /*                                                                  */
 421 /*------------------------------------------------------------------*/
 422
 423 gpointer
 424 mono_arch_get_rethrow_exception (void)
 425 {
 426         static guint8 start [384];
 427         static int inited = 0;
 428
 429         if (inited)
 430                 return start;
 431         get_throw_exception_generic (start, sizeof (start), FALSE, TRUE);
 432         inited = 1;
 433         return start;
 434 }
 435
 436 /*========================= End of Function ========================*/
 437
 438 /*------------------------------------------------------------------*/
 439 /*                                                                  */
 440 /* Name         - arch_get_throw_exception_by_name                  */
 441 /*                                                                  */
 442 /* Function     - Return a function pointer which can be used to    */
 443 /*                raise corlib exceptions. The return function has  */
 444 /*                the following signature:                          */
 445 /*                void (*func) (char *exc_name);                    */
 446 /*                                                                  */
 447 /*------------------------------------------------------------------*/
 448
 449 gpointer
 450 mono_arch_get_throw_exception_by_name (void)
 451 {
 452         static guint8 start [384];
 453         static int inited = 0;
 454
 455         if (inited)
 456                 return start;
 457         get_throw_exception_generic (start, sizeof (start), TRUE, FALSE);
 458         inited = 1;
 459         return start;
 460 }
 461
 462 /*========================= End of Function ========================*/
 463
 464 /*------------------------------------------------------------------*/
 465 /*                                                                  */
 466 /* Name         - glist_to_array                                    */
 467 /*                                                                  */
 468 /* Function     - Convert a list to a mono array.                   */
 469 /*                                                                  */
 470 /*------------------------------------------------------------------*/
 471
 472 static MonoArray *
 473 glist_to_array (GList *list)
 474 {
 475         MonoDomain *domain = mono_domain_get ();
 476         MonoArray *res;
 477         int len, i;
 478
 479         if (!list)
 480                 return NULL;
 481
 482         len = g_list_length (list);
 483         res = mono_array_new (domain, mono_defaults.int_class, len);
 484
 485         for (i = 0; list; list = list->next, i++)
 486                 mono_array_set (res, gpointer, i, list->data);
 487
 488         return res;
 489 }
 490
 491 /*========================= End of Function ========================*/
 492
 493 /*------------------------------------------------------------------*/
 494 /*                                                                  */
 495 /* Name         - mono_arch_find_jit_info                           */
 496 /*                                                                  */
 497 /* Function     - This function is used to gather informatoin from  */
 498 /*                @ctx. It returns the MonoJitInfo of the corres-   */
 499 /*                ponding function, unwinds one stack frame and     */
 500 /*                stores the resulting context into @new_ctx. It    */
 501 /*                also stores a string describing the stack location*/
 502 /*                into @trace (if not NULL), and modifies the @lmf  */
 503 /*                if necessary. @native_offset returns the IP off-  */
 504 /*                set from the start of the function or -1 if that  */
 505 /*                informatoin is not available.                     */
 506 /*                                                                  */
 507 /*------------------------------------------------------------------*/
 508
 509 MonoJitInfo *
 510 mono_arch_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls,
 511                          MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
 512                          MonoContext *new_ctx, char **trace, MonoLMF **lmf,
 513                          int *native_offset, gboolean *managed)
 514 {
 515         MonoJitInfo *ji;
 516         gpointer ip = MONO_CONTEXT_GET_IP (ctx);
 517         unsigned long *ptr;
 518         char *p;
 519         MonoS390StackFrame *sframe;
 520
 521         if (prev_ji &&
 522             (ip > prev_ji->code_start &&
 523             ((guint8 *) ip < ((guint8 *) prev_ji->code_start) + prev_ji->code_size)))
 524                 ji = prev_ji;
 525         else
 526                 ji = mono_jit_info_table_find (domain, ip);
 527
 528         if (trace)
 529                 *trace = NULL;
 530
 531         if (native_offset)
 532                 *native_offset = -1;
 533
 534         if (managed)
 535                 *managed = FALSE;
 536
 537         if (ji != NULL) {
 538                 char *source_location, *tmpaddr, *fname;
 539                 gint32 address, iloffset;
 540                 int offset;
 541
 542                 *new_ctx = *ctx;
 543
 544                 if (*lmf && (MONO_CONTEXT_GET_BP (ctx) >= (gpointer)(*lmf)->ebp)) {
 545                         /* remove any unused lmf */
 546                         *lmf = (*lmf)->previous_lmf;
 547                 }
 548
 549                 address = (char *)ip - (char *)ji->code_start;
 550
 551                 if (native_offset)
 552                         *native_offset = address;
 553
 554                 if (managed)
 555                         if (!ji->method->wrapper_type)
 556                                 *managed = TRUE;
 557
 558                 if (trace) {
 559                         source_location = mono_debug_source_location_from_address (ji->method, address, NULL, domain);
 560                         iloffset = mono_debug_il_offset_from_address (ji->method, address, domain);
 561
 562                         if (iloffset < 0)
 563                                 tmpaddr = g_strdup_printf ("<0x%08x>", address);
 564                         else
 565                                 tmpaddr = g_strdup_printf ("[0x%08x]", iloffset);
 566
 567                         fname = mono_method_full_name (ji->method, TRUE);
 568
 569                         if (source_location)
 570                                 *trace = g_strdup_printf ("in %s (at %s) %s", tmpaddr, source_location, fname);
 571                         else
 572                                 *trace = g_strdup_printf ("in %s %s", tmpaddr, fname);
 573
 574                         g_free (fname);
 575                         g_free (source_location);
 576                         g_free (tmpaddr);
 577                 }
 578                 sframe = (MonoS390StackFrame *) MONO_CONTEXT_GET_BP (ctx);
 579                 MONO_CONTEXT_SET_BP (new_ctx, sframe->prev);
 580                 sframe = (MonoS390StackFrame *) sframe->prev;
 581                 MONO_CONTEXT_SET_IP (new_ctx, sframe->return_address);
 582                 memcpy (&new_ctx->uc_mcontext.gregs[6], sframe->regs, (8*sizeof(gint32)));
 583                 *res = *ji;
 584                 return res;
 585         } else if (*lmf) {
 586
 587                 *new_ctx = *ctx;
 588
 589                 if (!(*lmf)->method)
 590                         return (gpointer)-1;
 591
 592                 if (trace)
 593                         *trace = g_strdup_printf ("in (unmanaged) %s", mono_method_full_name ((*lmf)->method, TRUE));
 594
 595                 if ((ji = mono_jit_info_table_find (domain, (gpointer)(*lmf)->eip))) {
 596                         *res = *ji;
 597                 } else {
 598                         memset (res, 0, sizeof (MonoJitInfo));
 599                         res->method = (*lmf)->method;
 600                 }
 601
 602                 memcpy(new_ctx->uc_mcontext.gregs, (*lmf)->gregs, sizeof((*lmf)->gregs));
 603                 memcpy(new_ctx->uc_mcontext.fpregs.fprs, (*lmf)->fregs, sizeof((*lmf)->fregs));
 604
 605                 MONO_CONTEXT_SET_BP (new_ctx, (*lmf)->ebp);
 606                 MONO_CONTEXT_SET_IP (new_ctx, (*lmf)->eip);
 607                 *lmf = (*lmf)->previous_lmf;
 608
 609                 return res;
 610
 611         }
 612
 613         return NULL;
 614 }
 615
 616 /*========================= End of Function ========================*/
 617
 618 /*------------------------------------------------------------------*/
 619 /*                                                                  */
 620 /* Name         - ves_icall_get_trace                               */
 621 /*                                                                  */
 622 /* Function     -                                                   */
 623 /*                                                                  */
 624 /*------------------------------------------------------------------*/
 625
 626 MonoArray *
 627 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
 628 {
 629         MonoDomain *domain = mono_domain_get ();
 630         MonoArray *res;
 631         MonoArray *ta = exc->trace_ips;
 632         int i, len;
 633
 634         if (ta == NULL) {
 635                 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
 636         }
 637
 638         len = mono_array_length (ta);
 639
 640         res = mono_array_new (domain, mono_defaults.stack_frame_class,
 641                               len > skip ? len - skip : 0);
 642
 643         for (i = skip; i < len; i++) {
 644                 MonoJitInfo *ji;
 645                 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
 646                 gpointer ip = mono_array_get (ta, gpointer, i);
 647
 648                 ji = mono_jit_info_table_find (domain, ip);
 649                 if (ji == NULL) {
 650                         mono_array_set (res, gpointer, i, sf);
 651                         continue;
 652                 }
 653
 654                 sf->method = mono_method_get_object (domain, ji->method, NULL);
 655                 sf->native_offset = (char *)ip - (char *)ji->code_start;
 656
 657                 sf->il_offset = mono_debug_il_offset_from_address (ji->method, sf->native_offset, domain);
 658
 659                 if (need_file_info) {
 660                         gchar *filename;
 661
 662                         filename = mono_debug_source_location_from_address (ji->method, sf->native_offset, &sf->line, domain);
 663
 664                         sf->filename = filename? mono_string_new (domain, filename): NULL;
 665                         sf->column = 0;
 666
 667                         g_free (filename);
 668                 }
 669
 670                 mono_array_set (res, gpointer, i, sf);
 671         }
 672
 673         return res;
 674 }
 675
 676 /*========================= End of Function ========================*/
 677
 678 /*------------------------------------------------------------------*/
 679 /*                                                                  */
 680 /* Name         - mono_jit_walk_stack                               */
 681 /*                                                                  */
 682 /* Function     -                                                   */
 683 /*                                                                  */
 684 /*------------------------------------------------------------------*/
 685
 686 void
 687 mono_jit_walk_stack (MonoStackWalk func, gboolean do_il_offset, gpointer user_data) {
 688         MonoDomain *domain = mono_domain_get ();
 689         MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
 690         MonoLMF *lmf = jit_tls->lmf;
 691         MonoJitInfo *ji, rji;
 692         gint native_offset, il_offset;
 693         gboolean managed;
 694         MonoContext ctx, new_ctx;
 695
 696         MONO_CONTEXT_SET_IP (&ctx, __builtin_return_address (0));
 697         MONO_CONTEXT_SET_BP (&ctx, __builtin_frame_address (1));
 698
 699         while (MONO_CONTEXT_GET_BP (&ctx) < jit_tls->end_of_stack) {
 700
 701                 ji = mono_arch_find_jit_info (domain, jit_tls, &rji, NULL,
 702                                               &ctx, &new_ctx, NULL, &lmf,
 703                                               &native_offset, &managed);
 704                 g_assert (ji);
 705
 706                 if (ji == (gpointer)-1)
 707                         return;
 708
 709                 il_offset = do_il_offset ? mono_debug_il_offset_from_address (ji->method, native_offset, domain): -1;
 710
 711                 if (func (ji->method, native_offset, il_offset, managed, user_data))
 712                         return;
 713
 714                 ctx = new_ctx;
 715         }
 716 }
 717
 718 /*========================= End of Function ========================*/
 719
 720 /*------------------------------------------------------------------*/
 721 /*                                                                  */
 722 /* Name         - ves_icall_get_frame_info                          */
 723 /*                                                                  */
 724 /* Function     -                                                   */
 725 /*                                                                  */
 726 /*------------------------------------------------------------------*/
 727
 728 MonoBoolean
 729 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
 730                           MonoReflectionMethod **method,
 731                           gint32 *iloffset, gint32 *native_offset,
 732                           MonoString **file, gint32 *line, gint32 *column)
 733 {
 734         MonoDomain *domain = mono_domain_get ();
 735         MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
 736         MonoLMF *lmf = jit_tls->lmf;
 737         MonoJitInfo *ji, rji;
 738         MonoContext ctx, new_ctx;
 739
 740         MONO_CONTEXT_SET_IP (&ctx, ves_icall_get_frame_info);
 741         MONO_CONTEXT_SET_BP (&ctx, __builtin_frame_address (0));
 742
 743         skip++;
 744
 745         do {
 746                 ji = mono_arch_find_jit_info (domain, jit_tls, &rji, NULL,
 747                                               &ctx, &new_ctx, NULL, &lmf,
 748                                               native_offset, NULL);
 749
 750                 ctx = new_ctx;
 751
 752                 if (!ji || ji == (gpointer)-1 || MONO_CONTEXT_GET_BP (&ctx) >= jit_tls->end_of_stack)
 753                         return FALSE;
 754
 755                 /* skip all wrappers ??*/
 756                 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
 757                     ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
 758                     ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
 759                     ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
 760                     ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE)
 761                         continue;
 762
 763                 skip--;
 764
 765         } while (skip >= 0);
 766
 767         *method = mono_method_get_object (domain, ji->method, NULL);
 768         *iloffset = mono_debug_il_offset_from_address (ji->method, *native_offset, domain);
 769
 770         if (need_file_info) {
 771                 gchar *filename;
 772
 773                 filename = mono_debug_source_location_from_address (ji->method, *native_offset, line, domain);
 774
 775                 *file = filename? mono_string_new (domain, filename): NULL;
 776                 *column = 0;
 777
 778                 g_free (filename);
 779         }
 780
 781         return TRUE;
 782 }
 783
 784 /*========================= End of Function ========================*/
 785
 786 /*------------------------------------------------------------------*/
 787 /*                                                                  */
 788 /* Name         - mono_arch_handle_exception                        */
 789 /*                                                                  */
 790 /* Function     - Handle an exception raised by the JIT code.       */
 791 /*                                                                  */
 792 /* Parameters   - ctx       - Saved processor state                 */
 793 /*                obj       - The exception object                  */
 794 /*                test_only - Only test if the exception is caught, */
 795 /*                            but don't call handlers               */
 796 /*                                                                  */
 797 /*------------------------------------------------------------------*/
 798
 799 gboolean
 800 mono_arch_handle_exception (void *uc, gpointer obj, gboolean test_only)
 801 {
 802         MonoContext     *ctx = uc;
 803         MonoDomain      *domain = mono_domain_get ();
 804         MonoJitInfo     *ji, rji;
 805         static int      (*call_filter) (MonoContext *, gpointer, gpointer) = NULL;
 806         MonoJitTlsData  *jit_tls = TlsGetValue (mono_jit_tls_id);
 807         MonoLMF         *lmf = jit_tls->lmf;
 808         GList           *trace_ips = NULL;
 809         GString         *traceStr  = NULL;
 810         MonoException   *mono_ex;
 811         MonoString      *initialStackTrace = NULL;
 812         int             frameCount = 0;
 813
 814         g_assert (ctx != NULL);
 815         memset(&rji, 0, sizeof(rji));
 816         if (!obj) {
 817                 MonoException *ex = mono_get_exception_null_reference ();
 818                 ex->message = mono_string_new (domain,
 819                         "Object reference not set to an instance of an object");
 820                 obj = (MonoObject *)ex;
 821         }
 822
 823         if (mono_object_isinst (obj, mono_defaults.exception_class)) {
 824                 mono_ex = (MonoException*)obj;
 825                 mono_ex->stack_trace = NULL;
 826         } else {
 827                 mono_ex = NULL;
 828         }
 829
 830
 831         if (!call_filter)
 832                 call_filter = arch_get_call_filter ();
 833
 834         g_assert (jit_tls->end_of_stack);
 835         g_assert (jit_tls->abort_func);
 836
 837         if (!test_only) {
 838                 MonoContext ctx_cp = *ctx;
 839                 if (mono_jit_trace_calls != NULL)
 840                         g_print ("EXCEPTION handling: %s\n", mono_object_class (obj)->name);
 841                 if (!mono_arch_handle_exception (&ctx_cp, obj, TRUE)) {
 842                         if (mono_break_on_exc)
 843                                 G_BREAKPOINT ();
 844                         mono_unhandled_exception (obj);
 845                 }
 846         }
 847
 848         memset (&rji, 0, sizeof(rji));
 849
 850         while (1) {
 851                 MonoContext new_ctx;
 852                 char *trace = NULL;
 853                 gboolean needTrace = FALSE;
 854
 855                 if (test_only && (frameCount < 1000)) {
 856                         needTrace = TRUE;
 857                         if (!traceStr)
 858                                 traceStr = g_string_new ("");
 859                 }
 860
 861                 ji = mono_arch_find_jit_info (domain, jit_tls, &rji, &rji, ctx, &new_ctx,
 862                                               test_only ? &trace : NULL, &lmf, NULL, NULL);
 863                 if (!ji) {
 864                         g_warning ("Exception inside function without unwind info");
 865                         g_assert_not_reached ();
 866                 }
 867
 868                 if (ji != (gpointer)-1) {
 869                         frameCount++;
 870
 871                         if ((test_only) &&
 872                             (ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE) &&
 873                             (mono_ex)) {
 874                                 if (!initialStackTrace && (frameCount < 1000)) {
 875                                         trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
 876                                         g_string_append   (traceStr, trace);
 877                                         g_string_append_c (traceStr, '\n');
 878                                 }
 879                         }
 880
 881                         if (ji->num_clauses) {
 882                                 int i;
 883
 884                                 g_assert (ji->clauses);
 885
 886                                 for (i = 0; i < ji->num_clauses; i++) {
 887                                         MonoJitExceptionInfo *ei = &ji->clauses [i];
 888                                         gboolean filtered = FALSE;
 889
 890                                         if (ei->try_start < MONO_CONTEXT_GET_IP (ctx) &&
 891                                             MONO_CONTEXT_GET_IP (ctx) <= ei->try_end) {
 892                                                 /* catch block */
 893                                                 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) ||
 894                                                     (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER)) {
 895                                                         g_assert (ji->exvar_offset);
 896                                                         *((gpointer *)((char *)MONO_CONTEXT_GET_BP (ctx) + ji->exvar_offset)) = obj;
 897                                                         if (!initialStackTrace &&
 898                                                             traceStr) {
 899                                                                 mono_ex->stack_trace =  mono_string_new (domain, traceStr->str);
 900                                                         }
 901                                                 }
 902
 903                                                 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER)
 904                                                       filtered = call_filter (ctx, ei->data.filter, obj);
 905
 906                                                 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) &&
 907                                                     (mono_object_isinst (obj, ei->data.catch_class)) ||
 908                                                     (filtered)) {
 909                                                         if (test_only) {
 910                                                                 if (mono_ex) {
 911                                                                         trace_ips = g_list_reverse (trace_ips);
 912                                                                         mono_ex->trace_ips = glist_to_array (trace_ips);
 913                                                                 }
 914                                                                 g_list_free (trace_ips);
 915                                                                 g_free (trace);
 916                                                                 if (traceStr)
 917                                                                         g_string_free (traceStr, TRUE);
 918
 919                                                                 return TRUE;
 920                                                         }
 921
 922                                                         if (mono_jit_trace_calls != NULL)
 923                                                                 g_print ("EXCEPTION: catch found at clause %d of %s - caught at %p with sp %p\n",
 924                                                                          i, mono_method_full_name (ji->method, TRUE),
 925                                                                          ei->handler_start,
 926                                                                          MONO_CONTEXT_GET_BP(ctx));
 927                                                         MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
 928                                                         jit_tls->lmf = lmf;
 929                                                         g_free (trace);
 930                                                         if (traceStr)
 931                                                                 g_string_free (traceStr, TRUE);
 932                                                         return FALSE;
 933                                                 }
 934
 935                                                 if (!test_only && ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
 936                                                     MONO_CONTEXT_GET_IP (ctx) < ei->try_end &&
 937                                                     (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
 938                                                         if (mono_jit_trace_calls != NULL)
 939                                                                 g_print ("EXCEPTION: finally clause %d of %s handled at: %p using sp: %p\n",
 940                                                                 i, mono_method_full_name (ji->method, TRUE),
 941                                                                 ei->handler_start,
 942                                                                 MONO_CONTEXT_GET_BP(ctx));
 943                                                         call_filter (ctx, ei->handler_start, NULL);
 944                                                 }
 945
 946                                         }
 947                                 }
 948                         }
 949                 }
 950
 951                 g_free (trace);
 952
 953                 *ctx = new_ctx;
 954
 955                 if ((ji == (gpointer)-1) ||
 956                     (MONO_CONTEXT_GET_BP (ctx) >= jit_tls->end_of_stack)) {
 957                         if (!test_only) {
 958                                 jit_tls->lmf = lmf;
 959                                 jit_tls->abort_func (obj);
 960                                 g_assert_not_reached ();
 961                         } else {
 962                                 if (mono_ex) {
 963                                         trace_ips = g_list_reverse (trace_ips);
 964                                         mono_ex->trace_ips = glist_to_array (trace_ips);
 965                                 }
 966                                 g_list_free (trace_ips);
 967                                 if (traceStr)
 968                                         g_string_free (traceStr, TRUE);
 969                                 return FALSE;
 970                         }
 971                 }
 972         }
 973
 974         g_assert_not_reached ();
 975 }
 976
 977 /*========================= End of Function ========================*/
 978
 979 /*------------------------------------------------------------------*/
 980 /*                                                                  */
 981 /* Name         - mono_arch_ip_from_context                         */
 982 /*                                                                  */
 983 /* Function     - Return the instruction pointer from the context.  */
 984 /*                                                                  */
 985 /* Parameters   - sigctx    - Saved processor state                 */
 986 /*                                                                  */
 987 /*------------------------------------------------------------------*/
 988
 989 gpointer
 990 mono_arch_ip_from_context (void *sigctx)
 991 {
 992         return context_get_ip (sigctx);
 993 }
 994