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