mono/mini/exceptions-s390x.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 /* disable this for now */
  39 #undef MONO_USE_EXC_TABLES
  40
  41 #define S390_CALLFILTER_INTREGS         S390_MINIMAL_STACK_SIZE
  42 #define S390_CALLFILTER_FLTREGS         S390_CALLFILTER_INTREGS+(16*sizeof(gulong))
  43 #define S390_CALLFILTER_ACCREGS         S390_CALLFILTER_FLTREGS+(16*sizeof(gdouble))
  44 #define S390_CALLFILTER_SIZE            (S390_CALLFILTER_ACCREGS+(16*sizeof(gulong)))
  45
  46 #define S390_THROWSTACK_ACCPRM          S390_MINIMAL_STACK_SIZE
  47 #define S390_THROWSTACK_FPCPRM          S390_THROWSTACK_ACCPRM+sizeof(gpointer)
  48 #define S390_THROWSTACK_INTREGS         S390_THROWSTACK_FPCPRM+sizeof(gulong)
  49 #define S390_THROWSTACK_FLTREGS         S390_THROWSTACK_INTREGS+(16*sizeof(gulong))
  50 #define S390_THROWSTACK_ACCREGS         S390_THROWSTACK_FLTREGS+(16*sizeof(gdouble))
  51 #define S390_THROWSTACK_SIZE            (S390_THROWSTACK_ACCREGS+(16*sizeof(gulong)))
  52
  53 /*========================= End of Defines =========================*/
  54
  55 /*------------------------------------------------------------------*/
  56 /*                 I n c l u d e s                                  */
  57 /*------------------------------------------------------------------*/
  58
  59 #include <config.h>
  60 #include <glib.h>
  61 #include <signal.h>
  62 #include <string.h>
  63 #include <ucontext.h>
  64
  65 #include <mono/arch/s390x/s390x-codegen.h>
  66 #include <mono/metadata/appdomain.h>
  67 #include <mono/metadata/tabledefs.h>
  68 #include <mono/metadata/threads.h>
  69 #include <mono/metadata/debug-helpers.h>
  70 #include <mono/metadata/exception.h>
  71 #include <mono/metadata/mono-debug.h>
  72
  73 #include "mini.h"
  74 #include "mini-s390x.h"
  75
  76 /*========================= End of Includes ========================*/
  77
  78 /*------------------------------------------------------------------*/
  79 /*                 T y p e d e f s                                  */
  80 /*------------------------------------------------------------------*/
  81
  82 typedef struct
  83 {
  84   void *prev;
  85   void *unused[5];
  86   void *regs[8];
  87   void *return_address;
  88 } MonoS390StackFrame;
  89
  90 #ifdef MONO_USE_EXC_TABLES
  91
  92 /*************************************/
  93 /*    STACK UNWINDING STUFF          */
  94 /*************************************/
  95
  96 /* These definitions are from unwind-dw2.c in glibc 2.2.5 */
  97
  98 /* For x86 */
  99 #define DWARF_FRAME_REGISTERS 17
 100
 101 typedef struct frame_state
 102 {
 103   void *cfa;
 104   void *eh_ptr;
 105   long cfa_offset;
 106   long args_size;
 107   long reg_or_offset[DWARF_FRAME_REGISTERS+1];
 108   unsigned short cfa_reg;
 109   unsigned short retaddr_column;
 110   char saved[DWARF_FRAME_REGISTERS+1];
 111 } frame_state;
 112
 113 typedef struct frame_state * (*framesf) (void *, struct frame_state *);
 114
 115 #endif
 116
 117 /*========================= End of Typedefs ========================*/
 118
 119 /*------------------------------------------------------------------*/
 120 /*                   P r o t o t y p e s                            */
 121 /*------------------------------------------------------------------*/
 122
 123 gboolean mono_arch_handle_exception (void     *ctx,
 124                                      gpointer obj,
 125                                      gboolean test_only);
 126
 127 /*========================= End of Prototypes ======================*/
 128
 129 /*------------------------------------------------------------------*/
 130 /*                 G l o b a l   V a r i a b l e s                  */
 131 /*------------------------------------------------------------------*/
 132
 133 #ifdef MONO_USE_EXC_TABLES
 134
 135 static framesf frame_state_for = NULL;
 136
 137 static gboolean inited = FALSE;
 138
 139 typedef char ** (*get_backtrace_symbols_type) (void *__const *__array, int __size);
 140
 141 static get_backtrace_symbols_type get_backtrace_symbols = NULL;
 142
 143 #endif
 144
 145 /*====================== End of Global Variables ===================*/
 146
 147 /*------------------------------------------------------------------*/
 148 /*                                                                  */
 149 /* Name         - context_get_ip                                    */
 150 /*                                                                  */
 151 /* Function     - Extract the current instruction address from the  */
 152 /*                context.                                          */
 153 /*                                                                  */
 154 /*------------------------------------------------------------------*/
 155
 156 static inline gpointer
 157 context_get_ip (MonoContext *ctx)
 158 {
 159         gpointer ip;
 160
 161         ip = (gpointer) ((gint32) (ctx->uc_mcontext.psw.addr) & 0x7fffffff);
 162         return ip;
 163 }
 164
 165 /*========================= End of Function ========================*/
 166
 167 #ifdef MONO_USE_EXC_TABLES
 168
 169 /*------------------------------------------------------------------*/
 170 /*                                                                  */
 171 /* Name         - init_frame_state_for                              */
 172 /*                                                                  */
 173 /* Function     - Load the __frame_state_for from libc.             */
 174 /*                There are two versions of __frame_state_for: one  */
 175 /*                in libgcc.a and the other in glibc.so. We need    */
 176 /*                the version from glibc. For more information, see:*/
 177 /*                http://gcc.gnu.org/ml/gcc/2002-08/msg00192.html   */
 178 /*                                                                  */
 179 /*------------------------------------------------------------------*/
 180
 181 static void
 182 init_frame_state_for (void)
 183 {
 184         GModule *module;
 185
 186         if ((module = g_module_open ("libc.so.6", G_MODULE_BIND_LAZY))) {
 187
 188                 if (!g_module_symbol (module, "__frame_state_for", (gpointer*)&frame_state_for))
 189                         frame_state_for = NULL;
 190
 191                 if (!g_module_symbol (module, "backtrace_symbols", (gpointer*)&get_backtrace_symbols)) {
 192                         get_backtrace_symbols = NULL;
 193                         frame_state_for = NULL;
 194                 }
 195
 196                 g_module_close (module);
 197         }
 198
 199         inited = TRUE;
 200 }
 201
 202 /*========================= End of Function ========================*/
 203
 204 #endif
 205
 206 /*------------------------------------------------------------------*/
 207 /*                                                                  */
 208 /* Name         - mono_arch_has_unwind_info                         */
 209 /*                                                                  */
 210 /* Function     - Tests if a function has a DWARF exception table   */
 211 /*                that is able to restore all caller saved registers*/
 212 /*                                                                  */
 213 /*------------------------------------------------------------------*/
 214
 215 gboolean
 216 mono_arch_has_unwind_info (gconstpointer addr)
 217 {
 218 #if 0
 219         struct frame_state state_in;
 220         struct frame_state *res;
 221
 222         if (!inited)
 223                 init_frame_state_for ();
 224
 225         if (!frame_state_for)
 226                 return FALSE;
 227
 228         g_assert (method->addr);
 229
 230         memset (&state_in, 0, sizeof (state_in));
 231
 232         /* offset 10 is just a guess, but it works for all methods tested */
 233         if ((res = frame_state_for ((char *)method->addr + 10, &state_in))) {
 234
 235                 if (res->saved [X86_EBX] != 1 ||
 236                     res->saved [X86_EDI] != 1 ||
 237                     res->saved [X86_EBP] != 1 ||
 238                     res->saved [X86_ESI] != 1) {
 239                         return FALSE;
 240                 }
 241                 return TRUE;
 242         } else {
 243                 return FALSE;
 244         }
 245 #else
 246         return FALSE;
 247 #endif
 248 }
 249
 250 /*========================= End of Function ========================*/
 251
 252 /*------------------------------------------------------------------*/
 253 /*                                                                  */
 254 /* Name         - s390_unwind_native_frame                          */
 255 /*                                                                  */
 256 /* Function     - Use the context to unwind a stack frame.          */
 257 /*                                                                  */
 258 /*------------------------------------------------------------------*/
 259
 260 static MonoJitInfo *
 261 s390_unwind_native_frame (MonoDomain *domain, MonoJitTlsData *jit_tls,
 262                           struct sigcontext *ctx, struct sigcontext *new_ctx,
 263                           MonoLMF *lmf, char **trace)
 264 {
 265 #if 0
 266         struct stack_frame *frame;
 267         gpointer max_stack;
 268         MonoJitInfo *ji;
 269         struct frame_state state_in;
 270         struct frame_state *res;
 271
 272         if (trace)
 273                 *trace = NULL;
 274
 275         if (!inited)
 276                 init_frame_state_for ();
 277
 278         if (!frame_state_for)
 279                 return FALSE;
 280
 281         frame = MONO_CONTEXT_GET_BP (ctx);
 282
 283         max_stack = lmf && lmf->method ? lmf : jit_tls->end_of_stack;
 284
 285         *new_ctx = *ctx;
 286
 287         memset (&state_in, 0, sizeof (state_in));
 288
 289         while ((gpointer)frame->next < (gpointer)max_stack) {
 290                 gpointer ip, addr = frame->return_address;
 291                 void *cfa;
 292                 char *tmp, **symbols;
 293
 294                 if (trace) {
 295                         ip = MONO_CONTEXT_GET_IP (new_ctx);
 296                         symbols = get_backtrace_symbols (&ip, 1);
 297                         if (*trace)
 298                                 tmp = g_strdup_printf ("%s\nin (unmanaged) %s", *trace, symbols [0]);
 299                         else
 300                                 tmp = g_strdup_printf ("in (unmanaged) %s", symbols [0]);
 301
 302                         free (symbols);
 303                         g_free (*trace);
 304                         *trace = tmp;
 305                 }
 306
 307                 if ((res = frame_state_for (addr, &state_in))) {
 308                         int i;
 309
 310                         cfa = (gint8*) (get_sigcontext_reg (new_ctx, res->cfa_reg) + res->cfa_offset);
 311                         frame = (struct stack_frame *)((gint8*)cfa - 8);
 312                         for (i = 0; i < DWARF_FRAME_REGISTERS + 1; i++) {
 313                                 int how = res->saved[i];
 314                                 long val;
 315                                 g_assert ((how == 0) || (how == 1));
 316
 317                                 if (how == 1) {
 318                                         val = * (long*) ((gint8*)cfa + res->reg_or_offset[i]);
 319                                         set_sigcontext_reg (new_ctx, i, val);
 320                                 }
 321                         }
 322                         new_ctx->SC_ESP = (long)cfa;
 323
 324                         if (res->saved [X86_EBX] == 1 &&
 325                             res->saved [X86_EDI] == 1 &&
 326                             res->saved [X86_EBP] == 1 &&
 327                             res->saved [X86_ESI] == 1 &&
 328                             (ji = mono_jit_info_table_find (domain, frame->return_address))) {
 329                                 //printf ("FRAME CFA %s\n", mono_method_full_name (ji->method, TRUE));
 330                                 return ji;
 331                         }
 332
 333                 } else {
 334
 335                         MONO_CONTEXT_SET_IP (new_ctx, frame->return_address);
 336                         frame = frame->next;
 337                         MONO_CONTEXT_SET_BP (new_ctx, frame);
 338
 339                         /* stop if !frame or when we detect an unexpected managed frame */
 340                         if (!frame || mono_jit_info_table_find (domain, frame->return_address)) {
 341                                 if (trace) {
 342                                         g_free (*trace);
 343                                         *trace = NULL;
 344                                 }
 345                                 return NULL;
 346                         }
 347                 }
 348         }
 349
 350         if (trace) {
 351                 g_free (*trace);
 352                 *trace = NULL;
 353         }
 354 #endif
 355         return NULL;
 356 }
 357
 358 /*========================= End of Function ========================*/
 359
 360 /*------------------------------------------------------------------*/
 361 /*                                                                  */
 362 /* Name         - arch_get_call_filter                              */
 363 /*                                                                  */
 364 /* Function     - Return a pointer to a method which calls an       */
 365 /*                exception filter. We also use this function to    */
 366 /*                call finally handlers (we pass NULL as @exc       */
 367 /*                object in this case).                             */
 368 /*                                                                  */
 369 /*------------------------------------------------------------------*/
 370
 371 static gpointer
 372 arch_get_call_filter (void)
 373 {
 374         static guint8 start [512];
 375         static int inited = 0;
 376         guint8 *code;
 377         int alloc_size, pos, i;
 378
 379         if (inited)
 380                 return start;
 381
 382         inited = 1;
 383         /* call_filter (MonoContext *ctx, unsigned long eip, gpointer exc) */
 384         code = start;
 385
 386         s390_stmg(code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
 387         s390_lgr (code, s390_r14, STK_BASE);
 388         alloc_size = S390_ALIGN(S390_CALLFILTER_SIZE, S390_STACK_ALIGNMENT);
 389         s390_aghi(code, STK_BASE, -alloc_size);
 390         s390_stg (code, s390_r14, 0, STK_BASE, 0);
 391
 392         /*------------------------------------------------------*/
 393         /* save general registers on stack                      */
 394         /*------------------------------------------------------*/
 395         s390_stmg(code, s390_r0, s390_r13, STK_BASE, S390_CALLFILTER_INTREGS);
 396
 397         /*------------------------------------------------------*/
 398         /* Get A(Context)                                       */
 399         /*------------------------------------------------------*/
 400         s390_lgr  (code, s390_r13, s390_r2);
 401
 402         /*------------------------------------------------------*/
 403         /* Get A(Handler Entry Point)                           */
 404         /*------------------------------------------------------*/
 405         s390_lgr  (code, s390_r0, s390_r3);
 406
 407         /*------------------------------------------------------*/
 408         /* Set parameter register with Exception                */
 409         /*------------------------------------------------------*/
 410         s390_lgr  (code, s390_r2, s390_r4);
 411
 412         /*------------------------------------------------------*/
 413         /* Load all registers with values from the context      */
 414         /*------------------------------------------------------*/
 415         s390_lmg  (code, s390_r3, s390_r12, s390_r13, G_STRUCT_OFFSET(MonoContext, uc_mcontext.gregs[3]));
 416         pos = G_STRUCT_OFFSET(MonoContext, uc_mcontext.fpregs.fprs[0]);
 417         for (i = 0; i < 16; ++i) {
 418                 s390_ld  (code, i, 0, s390_r13, pos);
 419                 pos += sizeof(gdouble);
 420         }
 421
 422         /*------------------------------------------------------*/
 423         /* Point at the copied stack frame and call the filter  */
 424         /*------------------------------------------------------*/
 425         s390_lgr  (code, s390_r1, s390_r0);
 426         s390_basr (code, s390_r14, s390_r1);
 427
 428         /*------------------------------------------------------*/
 429         /* Save return value                                    */
 430         /*------------------------------------------------------*/
 431         s390_lgr  (code, s390_r14, s390_r2);
 432
 433         /*------------------------------------------------------*/
 434         /* Restore all the regs from the stack                  */
 435         /*------------------------------------------------------*/
 436         s390_lmg  (code, s390_r0, s390_r13, STK_BASE, S390_CALLFILTER_INTREGS);
 437
 438         s390_lgr  (code, s390_r2, s390_r14);
 439         s390_aghi (code, s390_r15, alloc_size);
 440         s390_lmg  (code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
 441         s390_br   (code, s390_r14);
 442
 443         g_assert ((code - start) < sizeof(start));
 444         return start;
 445 }
 446
 447 /*========================= End of Function ========================*/
 448
 449 /*------------------------------------------------------------------*/
 450 /*                                                                  */
 451 /* Name         - throw_exception.                                  */
 452 /*                                                                  */
 453 /* Function     - Raise an exception based on the parameters passed.*/
 454 /*                                                                  */
 455 /*------------------------------------------------------------------*/
 456
 457 static void
 458 throw_exception (MonoObject *exc, unsigned long ip, unsigned long sp,
 459                  gulong *int_regs, gdouble *fp_regs, gulong *acc_regs, guint fpc)
 460 {
 461         static void (*restore_context) (MonoContext *);
 462         MonoContext ctx;
 463         int iReg;
 464
 465         memset(&ctx, 0, sizeof(ctx));
 466
 467         getcontext(&ctx);
 468
 469         /* adjust eip so that it point into the call instruction */
 470         ip -= 6;
 471
 472         for (iReg = 0; iReg < 16; iReg++) {
 473                 ctx.uc_mcontext.gregs[iReg]         = int_regs[iReg];
 474                 ctx.uc_mcontext.fpregs.fprs[iReg].d = fp_regs[iReg];
 475                 ctx.uc_mcontext.aregs[iReg]         = acc_regs[iReg];
 476         }
 477
 478         ctx.uc_mcontext.fpregs.fpc = fpc;
 479
 480         MONO_CONTEXT_SET_BP (&ctx, sp);
 481         MONO_CONTEXT_SET_IP (&ctx, ip);
 482
 483         if (mono_object_isinst (exc, mono_defaults.exception_class)) {
 484                 MonoException *mono_ex = (MonoException*)exc;
 485                 mono_ex->stack_trace = NULL;
 486         }
 487         mono_arch_handle_exception (&ctx, exc, FALSE);
 488         setcontext(&ctx);
 489
 490         g_assert_not_reached ();
 491 }
 492
 493 /*========================= End of Function ========================*/
 494
 495 /*------------------------------------------------------------------*/
 496 /*                                                                  */
 497 /* Name         - arch_get_throw_exception_generic                  */
 498 /*                                                                  */
 499 /* Function     - Return a function pointer which can be used to    */
 500 /*                raise exceptions. The returned function has the   */
 501 /*                following signature:                              */
 502 /*                void (*func) (MonoException *exc); or,            */
 503 /*                void (*func) (char *exc_name);                    */
 504 /*                                                                  */
 505 /*------------------------------------------------------------------*/
 506
 507 static gpointer
 508 mono_arch_get_throw_exception_generic (guint8 *start, int size, int by_name)
 509 {
 510         guint8 *code;
 511         int alloc_size, pos, i, offset;
 512
 513         code = start;
 514
 515         s390_stmg(code, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
 516         alloc_size = S390_ALIGN(S390_THROWSTACK_SIZE, S390_STACK_ALIGNMENT);
 517         s390_lgr  (code, s390_r14, STK_BASE);
 518         s390_aghi (code, STK_BASE, -alloc_size);
 519         s390_stg  (code, s390_r14, 0, STK_BASE, 0);
 520         if (by_name) {
 521                 s390_lgr  (code, s390_r4, s390_r2);
 522                 s390_bras (code, s390_r13, 6);
 523                 s390_llong(code, mono_defaults.corlib);
 524                 s390_llong(code, "System");
 525                 s390_lg   (code, s390_r2, 0, s390_r13, 0);
 526                 s390_lg   (code, s390_r3, 0, s390_r13, 4);
 527                 offset = (guint32) S390_RELATIVE(mono_exception_from_name, code);
 528                 s390_brasl(code, s390_r14, offset);
 529         }
 530         /*------------------------------------------------------*/
 531         /* save the general registers on the stack              */
 532         /*------------------------------------------------------*/
 533         s390_stmg(code, s390_r0, s390_r13, STK_BASE, S390_THROWSTACK_INTREGS);
 534
 535         s390_lgr (code, s390_r1, STK_BASE);
 536         s390_aghi(code, s390_r1, alloc_size);
 537         /*------------------------------------------------------*/
 538         /* save the return address in the parameter register    */
 539         /*------------------------------------------------------*/
 540         s390_lg  (code, s390_r3, 0, s390_r1, S390_RET_ADDR_OFFSET);
 541
 542         /*------------------------------------------------------*/
 543         /* save the floating point registers                    */
 544         /*------------------------------------------------------*/
 545         pos = S390_THROWSTACK_FLTREGS;
 546         for (i = 0; i < 16; ++i) {
 547                 s390_std (code, i, 0,STK_BASE, pos);
 548                 pos += sizeof (gdouble);
 549         }
 550         /*------------------------------------------------------*/
 551         /* save the access registers                            */
 552         /*------------------------------------------------------*/
 553         s390_stam (code, s390_r0, s390_r15, STK_BASE, S390_THROWSTACK_ACCREGS);
 554
 555         /*------------------------------------------------------*/
 556         /* call throw_exception (exc, ip, sp, gr, fr, ar)       */
 557         /* exc is already in place in r2                        */
 558         /*------------------------------------------------------*/
 559         s390_lgr  (code, s390_r4, s390_r1);        /* caller sp */
 560         /*------------------------------------------------------*/
 561         /* pointer to the saved int regs                        */
 562         /*------------------------------------------------------*/
 563         s390_la   (code, s390_r5, 0, STK_BASE, S390_THROWSTACK_INTREGS);
 564         s390_la   (code, s390_r6, 0, STK_BASE, S390_THROWSTACK_FLTREGS);
 565         s390_la   (code, s390_r7, 0, STK_BASE, S390_THROWSTACK_ACCREGS);
 566         s390_stg  (code, s390_r7, 0, STK_BASE, S390_THROWSTACK_ACCPRM);
 567         s390_stfpc(code, STK_BASE, S390_THROWSTACK_FPCPRM);
 568         offset = (guint32) S390_RELATIVE(throw_exception, code);
 569         s390_brasl(code, s390_r14, offset);
 570         /* we should never reach this breakpoint */
 571         s390_break (code);
 572         g_assert ((code - start) < size);
 573         return start;
 574 }
 575
 576 /*========================= End of Function ========================*/
 577
 578 /*------------------------------------------------------------------*/
 579 /*                                                                  */
 580 /* Name         - arch_get_throw_exception                          */
 581 /*                                                                  */
 582 /* Function     - Return a function pointer which can be used to    */
 583 /*                raise exceptions. The returned function has the   */
 584 /*                following signature:                              */
 585 /*                void (*func) (MonoException *exc);                */
 586 /*                                                                  */
 587 /*------------------------------------------------------------------*/
 588
 589 gpointer
 590 mono_arch_get_throw_exception (void)
 591 {
 592         static guint8 start [384];
 593         static int inited = 0;
 594
 595         if (inited)
 596                 return start;
 597         mono_arch_get_throw_exception_generic (start, sizeof (start), FALSE);
 598         inited = 1;
 599         return start;
 600 }
 601
 602 /*========================= End of Function ========================*/
 603
 604 /*------------------------------------------------------------------*/
 605 /*                                                                  */
 606 /* Name         - arch_get_throw_exception_by_name                  */
 607 /*                                                                  */
 608 /* Function     - Return a function pointer which can be used to    */
 609 /*                raise corlib exceptions. The return function has  */
 610 /*                the following signature:                          */
 611 /*                void (*func) (char *exc_name);                    */
 612 /*                                                                  */
 613 /*------------------------------------------------------------------*/
 614
 615 gpointer
 616 mono_arch_get_throw_exception_by_name (void)
 617 {
 618         static guint8 start [384];
 619         static int inited = 0;
 620
 621         if (inited)
 622                 return start;
 623         mono_arch_get_throw_exception_generic (start, sizeof (start), TRUE);
 624         inited = 1;
 625         return start;
 626 }
 627
 628 /*========================= End of Function ========================*/
 629
 630 /*------------------------------------------------------------------*/
 631 /*                                                                  */
 632 /* Name         - glist_to_array                                    */
 633 /*                                                                  */
 634 /* Function     - Convert a list to a mono array.                   */
 635 /*                                                                  */
 636 /*------------------------------------------------------------------*/
 637
 638 static MonoArray *
 639 glist_to_array (GList *list)
 640 {
 641         MonoDomain *domain = mono_domain_get ();
 642         MonoArray *res;
 643         int len, i;
 644
 645         if (!list)
 646                 return NULL;
 647
 648         len = g_list_length (list);
 649         res = mono_array_new (domain, mono_defaults.int_class, len);
 650
 651         for (i = 0; list; list = list->next, i++)
 652                 mono_array_set (res, gpointer, i, list->data);
 653
 654         return res;
 655 }
 656
 657 /*========================= End of Function ========================*/
 658
 659 /*------------------------------------------------------------------*/
 660 /*                                                                  */
 661 /* Name         - mono_arch_find_jit_info                           */
 662 /*                                                                  */
 663 /* Function     - This function is used to gather informatoin from  */
 664 /*                @ctx. It returns the MonoJitInfo of the corres-   */
 665 /*                ponding function, unwinds one stack frame and     */
 666 /*                stores the resulting context into @new_ctx. It    */
 667 /*                also stores a string describing the stack location*/
 668 /*                into @trace (if not NULL), and modifies the @lmf  */
 669 /*                if necessary. @native_offset returns the IP off-  */
 670 /*                set from the start of the function or -1 if that  */
 671 /*                informatoin is not available.                     */
 672 /*                                                                  */
 673 /*------------------------------------------------------------------*/
 674
 675 MonoJitInfo *
 676 mono_arch_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls,
 677                          MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
 678                          MonoContext *new_ctx, char **trace, MonoLMF **lmf,
 679                          int *native_offset, gboolean *managed)
 680 {
 681         MonoJitInfo *ji;
 682         gpointer ip = MONO_CONTEXT_GET_IP (ctx);
 683         unsigned long *ptr;
 684         char *p;
 685         MonoS390StackFrame *sframe;
 686
 687         if (prev_ji &&
 688             (ip > prev_ji->code_start &&
 689             ((guint8 *) ip < ((guint8 *) prev_ji->code_start) + prev_ji->code_size)))
 690                 ji = prev_ji;
 691         else
 692                 ji = mono_jit_info_table_find (domain, ip);
 693
 694         if (trace)
 695                 *trace = NULL;
 696
 697         if (native_offset)
 698                 *native_offset = -1;
 699
 700         if (managed)
 701                 *managed = FALSE;
 702
 703         if (ji != NULL) {
 704                 char *source_location, *tmpaddr, *fname;
 705                 gint32 address, iloffset;
 706                 int offset;
 707
 708                 *new_ctx = *ctx;
 709 //              memcpy(new_ctx, ctx, sizeof(*new_ctx));
 710
 711                 if (*lmf && (MONO_CONTEXT_GET_BP (ctx) >= (gpointer)(*lmf)->ebp)) {
 712                         /* remove any unused lmf */
 713                         *lmf = (*lmf)->previous_lmf;
 714                 }
 715
 716                 address = (char *)ip - (char *)ji->code_start;
 717
 718                 if (native_offset)
 719                         *native_offset = address;
 720
 721                 if (managed)
 722                         if (!ji->method->wrapper_type)
 723                                 *managed = TRUE;
 724
 725                 if (trace) {
 726                         source_location = mono_debug_source_location_from_address (ji->method, address, NULL, domain);
 727                         iloffset = mono_debug_il_offset_from_address (ji->method, address, domain);
 728
 729                         if (iloffset < 0)
 730                                 tmpaddr = g_strdup_printf ("<0x%08x>", address);
 731                         else
 732                                 tmpaddr = g_strdup_printf ("[0x%08x]", iloffset);
 733
 734                         fname = mono_method_full_name (ji->method, TRUE);
 735
 736                         if (source_location)
 737                                 *trace = g_strdup_printf ("in %s (at %s) %s", tmpaddr, source_location, fname);
 738                         else
 739                                 *trace = g_strdup_printf ("in %s %s", tmpaddr, fname);
 740
 741                         g_free (fname);
 742                         g_free (source_location);
 743                         g_free (tmpaddr);
 744                 }
 745                 sframe = (MonoS390StackFrame *) MONO_CONTEXT_GET_BP (ctx);
 746                 MONO_CONTEXT_SET_BP (new_ctx, sframe->prev);
 747                 sframe = (MonoS390StackFrame *) sframe->prev;
 748                 MONO_CONTEXT_SET_IP (new_ctx, sframe->return_address);
 749                 memcpy (&new_ctx->uc_mcontext.gregs[6], sframe->regs, (8*sizeof(gint32)));
 750                 *res = *ji;
 751                 return res;
 752 #ifdef MONO_USE_EXC_TABLES
 753         } else if ((ji = s390_unwind_native_frame (domain, jit_tls, ctx, new_ctx, *lmf, trace))) {
 754                 *res = *ji;
 755                 return res;
 756 #endif
 757         } else if (*lmf) {
 758
 759                 *new_ctx = *ctx;
 760
 761                 if (!(*lmf)->method)
 762                         return (gpointer)-1;
 763
 764                 if (trace)
 765                         *trace = g_strdup_printf ("in (unmanaged) %s", mono_method_full_name ((*lmf)->method, TRUE));
 766
 767                 if ((ji = mono_jit_info_table_find (domain, (gpointer)(*lmf)->eip))) {
 768                         *res = *ji;
 769                 } else {
 770                         memset (res, 0, sizeof (MonoJitInfo));
 771                         res->method = (*lmf)->method;
 772                 }
 773
 774 /*
 775                 MONO_CONTEXT_SET_BP (ctx, (*lmf)->ebp);
 776                 MONO_CONTEXT_SET_IP (ctx, (*lmf)->eip);
 777 */
 778                 memcpy(new_ctx->uc_mcontext.gregs, (*lmf)->gregs, sizeof((*lmf)->gregs));
 779                 memcpy(new_ctx->uc_mcontext.fpregs.fprs, (*lmf)->fregs, sizeof((*lmf)->fregs));
 780
 781                 MONO_CONTEXT_SET_BP (new_ctx, (*lmf)->ebp);
 782                 MONO_CONTEXT_SET_IP (new_ctx, (*lmf)->eip);
 783                 *lmf = (*lmf)->previous_lmf;
 784
 785                 return res;
 786
 787         }
 788
 789         return NULL;
 790 }
 791
 792 /*========================= End of Function ========================*/
 793
 794 /*------------------------------------------------------------------*/
 795 /*                                                                  */
 796 /* Name         - ves_icall_get_trace                               */
 797 /*                                                                  */
 798 /* Function     -                                                   */
 799 /*                                                                  */
 800 /*------------------------------------------------------------------*/
 801
 802 MonoArray *
 803 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
 804 {
 805         MonoDomain *domain = mono_domain_get ();
 806         MonoArray *res;
 807         MonoArray *ta = exc->trace_ips;
 808         int i, len;
 809
 810         if (ta == NULL) {
 811                 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
 812         }
 813
 814         len = mono_array_length (ta);
 815
 816         res = mono_array_new (domain, mono_defaults.stack_frame_class,
 817                               len > skip ? len - skip : 0);
 818
 819         for (i = skip; i < len; i++) {
 820                 MonoJitInfo *ji;
 821                 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
 822                 gpointer ip = mono_array_get (ta, gpointer, i);
 823
 824                 ji = mono_jit_info_table_find (domain, ip);
 825                 if (ji == NULL) {
 826                         mono_array_set (res, gpointer, i, sf);
 827                         continue;
 828                 }
 829
 830                 sf->method = mono_method_get_object (domain, ji->method, NULL);
 831                 sf->native_offset = (char *)ip - (char *)ji->code_start;
 832
 833                 sf->il_offset = mono_debug_il_offset_from_address (ji->method, sf->native_offset, domain);
 834
 835                 if (need_file_info) {
 836                         gchar *filename;
 837
 838                         filename = mono_debug_source_location_from_address (ji->method, sf->native_offset, &sf->line, domain);
 839
 840                         sf->filename = filename? mono_string_new (domain, filename): NULL;
 841                         sf->column = 0;
 842
 843                         g_free (filename);
 844                 }
 845
 846                 mono_array_set (res, gpointer, i, sf);
 847         }
 848
 849         return res;
 850 }
 851
 852 /*========================= End of Function ========================*/
 853
 854 /*------------------------------------------------------------------*/
 855 /*                                                                  */
 856 /* Name         - mono_jit_walk_stack                               */
 857 /*                                                                  */
 858 /* Function     -                                                   */
 859 /*                                                                  */
 860 /*------------------------------------------------------------------*/
 861
 862 void
 863 mono_jit_walk_stack (MonoStackWalk func, gboolean do_il_offset, gpointer user_data) {
 864         MonoDomain *domain = mono_domain_get ();
 865         MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
 866         MonoLMF *lmf = jit_tls->lmf;
 867         MonoJitInfo *ji, rji;
 868         gint native_offset, il_offset;
 869         gboolean managed;
 870         MonoContext ctx, new_ctx;
 871
 872         MONO_CONTEXT_SET_IP (&ctx, __builtin_return_address (0));
 873         MONO_CONTEXT_SET_BP (&ctx, __builtin_frame_address (1));
 874
 875         while (MONO_CONTEXT_GET_BP (&ctx) < jit_tls->end_of_stack) {
 876
 877                 ji = mono_arch_find_jit_info (domain, jit_tls, &rji, NULL,
 878                                               &ctx, &new_ctx, NULL, &lmf,
 879                                               &native_offset, &managed);
 880                 g_assert (ji);
 881
 882                 if (ji == (gpointer)-1)
 883                         return;
 884
 885                 il_offset = do_il_offset ? mono_debug_il_offset_from_address (ji->method, native_offset, domain): -1;
 886
 887                 if (func (ji->method, native_offset, il_offset, managed, user_data))
 888                         return;
 889
 890                 ctx = new_ctx;
 891         }
 892 }
 893
 894 /*========================= End of Function ========================*/
 895
 896 /*------------------------------------------------------------------*/
 897 /*                                                                  */
 898 /* Name         - ves_icall_get_frame_info                          */
 899 /*                                                                  */
 900 /* Function     -                                                   */
 901 /*                                                                  */
 902 /*------------------------------------------------------------------*/
 903
 904 MonoBoolean
 905 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
 906                           MonoReflectionMethod **method,
 907                           gint32 *iloffset, gint32 *native_offset,
 908                           MonoString **file, gint32 *line, gint32 *column)
 909 {
 910         MonoDomain *domain = mono_domain_get ();
 911         MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
 912         MonoLMF *lmf = jit_tls->lmf;
 913         MonoJitInfo *ji, rji;
 914         MonoContext ctx, new_ctx;
 915
 916         MONO_CONTEXT_SET_IP (&ctx, ves_icall_get_frame_info);
 917         MONO_CONTEXT_SET_BP (&ctx, __builtin_frame_address (0));
 918
 919         skip++;
 920
 921         do {
 922                 ji = mono_arch_find_jit_info (domain, jit_tls, &rji, NULL,
 923                                               &ctx, &new_ctx, NULL, &lmf,
 924                                               native_offset, NULL);
 925
 926                 ctx = new_ctx;
 927
 928                 if (!ji || ji == (gpointer)-1 || MONO_CONTEXT_GET_BP (&ctx) >= jit_tls->end_of_stack)
 929                         return FALSE;
 930
 931                 /* skip all wrappers ??*/
 932                 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
 933                     ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
 934                     ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE)
 935                         continue;
 936
 937                 skip--;
 938
 939         } while (skip >= 0);
 940
 941         *method = mono_method_get_object (domain, ji->method, NULL);
 942         *iloffset = mono_debug_il_offset_from_address (ji->method, *native_offset, domain);
 943
 944         if (need_file_info) {
 945                 gchar *filename;
 946
 947                 filename = mono_debug_source_location_from_address (ji->method, *native_offset, line, domain);
 948
 949                 *file = filename? mono_string_new (domain, filename): NULL;
 950                 *column = 0;
 951
 952                 g_free (filename);
 953         }
 954
 955         return TRUE;
 956 }
 957
 958 /*========================= End of Function ========================*/
 959
 960 /*------------------------------------------------------------------*/
 961 /*                                                                  */
 962 /* Name         - mono_arch_handle_exception                        */
 963 /*                                                                  */
 964 /* Function     - Handle an exception raised by the JIT code.       */
 965 /*                                                                  */
 966 /* Parameters   - ctx       - Saved processor state                 */
 967 /*                obj       - The exception object                  */
 968 /*                test_only - Only test if the exception is caught, */
 969 /*                            but don't call handlers               */
 970 /*                                                                  */
 971 /*------------------------------------------------------------------*/
 972
 973 gboolean
 974 mono_arch_handle_exception (void *uc, gpointer obj, gboolean test_only)
 975 {
 976         MonoContext     *ctx = uc;
 977         MonoDomain      *domain = mono_domain_get ();
 978         MonoJitInfo     *ji, rji;
 979         static int      (*call_filter) (MonoContext *, gpointer, gpointer) = NULL;
 980         MonoJitTlsData  *jit_tls = TlsGetValue (mono_jit_tls_id);
 981         MonoLMF         *lmf = jit_tls->lmf;
 982         GList           *trace_ips = NULL;
 983         MonoException   *mono_ex;
 984
 985         g_assert (ctx != NULL);
 986         memset(&rji, 0, sizeof(rji));
 987         if (!obj) {
 988                 MonoException *ex = mono_get_exception_null_reference ();
 989                 ex->message = mono_string_new (domain,
 990                         "Object reference not set to an instance of an object");
 991                 obj = (MonoObject *)ex;
 992         }
 993
 994         if (mono_object_isinst (obj, mono_defaults.exception_class)) {
 995                 mono_ex = (MonoException*)obj;
 996                 mono_ex->stack_trace = NULL;
 997         } else {
 998                 mono_ex = NULL;
 999         }
1000
1001
1002         if (!call_filter)
1003                 call_filter = arch_get_call_filter ();
1004
1005         g_assert (jit_tls->end_of_stack);
1006         g_assert (jit_tls->abort_func);
1007
1008         if (!test_only) {
1009                 MonoContext ctx_cp = *ctx;
1010                 if (mono_jit_trace_calls != NULL)
1011                         g_print ("EXCEPTION handling: %s\n", mono_object_class (obj)->name);
1012                 if (!mono_arch_handle_exception (&ctx_cp, obj, TRUE)) {
1013                         if (mono_break_on_exc)
1014                                 G_BREAKPOINT ();
1015                         mono_unhandled_exception (obj);
1016                 }
1017         }
1018
1019         while (1) {
1020                 MonoContext new_ctx;
1021                 char *trace = NULL;
1022
1023                 ji = mono_arch_find_jit_info (domain, jit_tls, &rji, &rji, ctx, &new_ctx,
1024                                               test_only ? &trace : NULL, &lmf, NULL, NULL);
1025                 if (!ji) {
1026                         g_warning ("Exception inside function without unwind info");
1027                         g_assert_not_reached ();
1028                 }
1029
1030                 if (ji != (gpointer)-1) {
1031
1032                         if (test_only && ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1033                                 char *tmp, *strace;
1034
1035                                 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1036
1037                                 if (!mono_ex->stack_trace)
1038                                         strace = g_strdup ("");
1039                                 else
1040                                         strace = mono_string_to_utf8 (mono_ex->stack_trace);
1041
1042                                 tmp = g_strdup_printf ("%s%s\n", strace, trace);
1043                                 g_free (strace);
1044
1045                                 mono_ex->stack_trace = mono_string_new (domain, tmp);
1046
1047                                 g_free (tmp);
1048                         }
1049
1050                         if (ji->num_clauses) {
1051                                 int i;
1052
1053                                 g_assert (ji->clauses);
1054
1055                                 for (i = 0; i < ji->num_clauses; i++) {
1056                                         MonoJitExceptionInfo *ei = &ji->clauses [i];
1057
1058                                         if (ei->try_start < MONO_CONTEXT_GET_IP (ctx) &&
1059                                             MONO_CONTEXT_GET_IP (ctx) <= ei->try_end) {
1060                                                 /* catch block */
1061                                                 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1062                                                      mono_object_isinst (obj, mono_class_get (ji->method->klass->image, ei->data.token))) ||
1063                                                     ((ei->flags == MONO_EXCEPTION_CLAUSE_FILTER &&
1064                                                       call_filter (ctx, ei->data.filter, obj)))) {
1065                                                         if (test_only) {
1066                                                                 if (mono_ex) {
1067                                                                         trace_ips = g_list_reverse (trace_ips);
1068                                                                         mono_ex->trace_ips = glist_to_array (trace_ips);
1069                                                                 }
1070                                                                 g_list_free (trace_ips);
1071                                                                 g_free (trace);
1072                                                                 return TRUE;
1073                                                         }
1074 //                                                      memcpy(ctx, &new_ctx, sizeof(new_ctx));
1075                                                         if (mono_jit_trace_calls != NULL)
1076                                                                 g_print ("EXCEPTION: catch found at clause %d of %s - caught at %p with sp %p\n",
1077                                                                          i, mono_method_full_name (ji->method, TRUE),
1078                                                                          ei->handler_start,
1079                                                                          MONO_CONTEXT_GET_BP(ctx));
1080                                                         MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1081                                                         *((gpointer *)((char *)MONO_CONTEXT_GET_BP (ctx) + ji->exvar_offset)) = obj;
1082                                                         jit_tls->lmf = lmf;
1083                                                         g_free (trace);
1084                                                         return 0;
1085                                                 }
1086                                                 if (!test_only && ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
1087                                                     MONO_CONTEXT_GET_IP (ctx) < ei->try_end &&
1088                                                     (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1089                                                         if (mono_jit_trace_calls != NULL)
1090                                                                 g_print ("EXCEPTION: finally clause %d of %s handled at: %p using sp: %p\n",
1091                                                                 i, mono_method_full_name (ji->method, TRUE),
1092                                                                 ei->handler_start,
1093                                                                 MONO_CONTEXT_GET_BP(ctx));
1094                                                         call_filter (ctx, ei->handler_start, NULL);
1095                                                 }
1096
1097                                         }
1098                                 }
1099                         }
1100                 }
1101
1102                 g_free (trace);
1103
1104                 *ctx = new_ctx;
1105
1106                 if ((ji == (gpointer)-1) || MONO_CONTEXT_GET_BP (ctx) >= jit_tls->end_of_stack) {
1107                         if (!test_only) {
1108                                 jit_tls->lmf = lmf;
1109                                 jit_tls->abort_func (obj);
1110                                 g_assert_not_reached ();
1111                         } else {
1112                                 if (mono_ex) {
1113                                         trace_ips = g_list_reverse (trace_ips);
1114                                         mono_ex->trace_ips = glist_to_array (trace_ips);
1115                                 }
1116                                 g_list_free (trace_ips);
1117                                 return FALSE;
1118                         }
1119                 }
1120         }
1121
1122         g_assert_not_reached ();
1123 }
1124
1125 /*========================= End of Function ========================*/
1126
1127 /*------------------------------------------------------------------*/
1128 /*                                                                  */
1129 /* Name         - mono_arch_ip_from_context                         */
1130 /*                                                                  */
1131 /* Function     - Return the instruction pointer from the context.  */
1132 /*                                                                  */
1133 /* Parameters   - sigctx    - Saved processor state                 */
1134 /*                                                                  */
1135 /*------------------------------------------------------------------*/
1136
1137 gpointer
1138 mono_arch_ip_from_context (void *sigctx)
1139 {
1140         return context_get_ip (sigctx);
1141 }
1142