mono/mini/tramp-s390x.c

   1 /*------------------------------------------------------------------*/
   2 /*                                                                  */
   3 /* Name        - tramp-s390.c                                       */
   4 /*                                                                  */
   5 /* Function    - JIT trampoline code 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 GR_SAVE_SIZE            4*sizeof(long)
  24 #define FP_SAVE_SIZE            16*sizeof(double)
  25 #define METHOD_SAVE_OFFSET      S390_MINIMAL_STACK_SIZE
  26 #define CREATE_GR_OFFSET        METHOD_SAVE_OFFSET+8
  27 #define CREATE_FP_OFFSET        CREATE_GR_OFFSET+GR_SAVE_SIZE
  28 #define CREATE_LMF_OFFSET       CREATE_FP_OFFSET+FP_SAVE_SIZE
  29 #define CREATE_STACK_SIZE       (CREATE_LMF_OFFSET+2*sizeof(long)+sizeof(MonoLMF))
  30
  31 /*------------------------------------------------------------------*/
  32 /* Method-specific trampoline code fragment sizes                   */
  33 /*------------------------------------------------------------------*/
  34 #define SPECIFIC_TRAMPOLINE_SIZE        96
  35
  36 /*========================= End of Defines =========================*/
  37
  38 /*------------------------------------------------------------------*/
  39 /*                 I n c l u d e s                                  */
  40 /*------------------------------------------------------------------*/
  41
  42 #include <config.h>
  43 #include <glib.h>
  44 #include <string.h>
  45
  46 #include <mono/metadata/appdomain.h>
  47 #include <mono/metadata/marshal.h>
  48 #include <mono/metadata/tabledefs.h>
  49 #include <mono/arch/s390x/s390x-codegen.h>
  50
  51 #include "mini.h"
  52 #include "mini-s390x.h"
  53
  54 /*========================= End of Includes ========================*/
  55
  56 /*------------------------------------------------------------------*/
  57 /*                 T y p e d e f s                                  */
  58 /*------------------------------------------------------------------*/
  59
  60 /*========================= End of Typedefs ========================*/
  61
  62 /*------------------------------------------------------------------*/
  63 /*                   P r o t o t y p e s                            */
  64 /*------------------------------------------------------------------*/
  65
  66 /*========================= End of Prototypes ======================*/
  67
  68 /*------------------------------------------------------------------*/
  69 /*                 G l o b a l   V a r i a b l e s                  */
  70 /*------------------------------------------------------------------*/
  71
  72
  73 /*====================== End of Global Variables ===================*/
  74
  75 /*------------------------------------------------------------------*/
  76 /*                                                                  */
  77 /* Name         - mono_arch_get_unbox_trampoline                        */
  78 /*                                                                  */
  79 /* Function     - Return a pointer to a trampoline which does the   */
  80 /*                unboxing before calling the method.               */
  81 /*                                                                  */
  82 /*                When value type methods are called through the    */
  83 /*                vtable we need to unbox the 'this' argument.      */
  84 /*                                                                  */
  85 /* Parameters   - gsctx  - Generic sharing context                  */
  86 /*                method - Methd pointer                            */
  87 /*                addr   - Pointer to native code for method        */
  88 /*                                                                  */
  89 /*------------------------------------------------------------------*/
  90
  91 gpointer
  92 mono_arch_get_unbox_trampoline (MonoGenericSharingContext *gsctx, MonoMethod *method, gpointer addr)
  93 {
  94         guint8 *code, *start;
  95         int this_pos = s390_r2;
  96         MonoDomain *domain = mono_domain_get ();
  97
  98         start = addr;
  99         if (MONO_TYPE_ISSTRUCT (mono_method_signature (method)->ret))
 100                 this_pos = s390_r3;
 101
 102         start = code = mono_domain_code_reserve (domain, 28);
 103
 104         s390_basr (code, s390_r1, 0);
 105         s390_j    (code, 6);
 106         s390_llong(code, addr);
 107         s390_lg   (code, s390_r1, 0, s390_r1, 4);
 108         s390_aghi (code, this_pos, sizeof(MonoObject));
 109         s390_br   (code, s390_r1);
 110
 111         g_assert ((code - start) <= 28);
 112
 113         mono_arch_flush_icache (start, code - start);
 114
 115         return start;
 116 }
 117
 118 /*========================= End of Function ========================*/
 119
 120 /*------------------------------------------------------------------*/
 121 /*                                                                  */
 122 /* Name         - mono_arch_patch_callsite                              */
 123 /*                                                                  */
 124 /* Function     - Patch a non-virtual callsite so it calls @addr.       */
 125 /*                                                                  */
 126 /*------------------------------------------------------------------*/
 127
 128 void
 129 mono_arch_patch_callsite (guint8 *method_start, guint8 *orig_code, guint8 *addr)
 130 {
 131         gint32 displace;
 132         unsigned short opcode;
 133
 134         opcode = *((unsigned short *) (orig_code - 6));
 135         if (opcode == 0xc0e5) {
 136                 /* This is the 'brasl' instruction */
 137                 orig_code    -= 4;
 138                 displace = ((gssize) addr - (gssize) (orig_code - 2)) / 2;
 139                 s390_patch_rel (orig_code, displace);
 140                 mono_arch_flush_icache (orig_code, 4);
 141         } else {
 142                 /* This should be a 'lg %r14,4(%r13)' then a 'basr r14, r14' instruction */
 143                 g_assert (orig_code [-8] == 0xe3);
 144                 g_assert (orig_code [-7] == 0xe0);
 145                 g_assert (orig_code [-6] == 0xd0);
 146                 g_assert (orig_code [-5] == 0x04);
 147                 g_assert (orig_code [-4] == 0x00);
 148                 g_assert (orig_code [-3] == 0x04);
 149                 opcode = *((unsigned short*) (orig_code - 2));
 150                 g_assert (opcode == 0x0dee);
 151
 152                 /* The call address is stored in the 8 bytes preceeding the basr instruction */
 153                 s390_patch_addr(orig_code - 16, (gssize)addr);
 154                 mono_arch_flush_icache (orig_code - 16, 8);
 155         }
 156 }
 157
 158 /*========================= End of Function ========================*/
 159
 160 void
 161 mono_arch_patch_plt_entry (guint8 *code, guint8 *addr)
 162 {
 163         g_assert_not_reached ();
 164 }
 165
 166 /*========================= End of Function ========================*/
 167
 168 /*------------------------------------------------------------------*/
 169 /*                                                                  */
 170 /* Name         - mono_arch_nullify_class_init_trampoline               */
 171 /*                                                                  */
 172 /* Function     - Nullify a call which calls a class init trampoline    */
 173 /*                                                                  */
 174 /*------------------------------------------------------------------*/
 175
 176 void
 177 mono_arch_nullify_class_init_trampoline (guint8 *code, gssize *regs)
 178 {
 179         char patch[2] = {0x07, 0x00};
 180
 181         code = code - 2;
 182
 183         memcpy(code, patch, sizeof(patch));
 184 }
 185
 186 /*========================= End of Function ========================*/
 187
 188 void
 189 mono_arch_nullify_plt_entry (guint8 *code)
 190 {
 191         g_assert_not_reached ();
 192 }
 193
 194 /*========================= End of Function ========================*/
 195
 196 /*------------------------------------------------------------------*/
 197 /*                                                                  */
 198 /* Name         - mono_arch_get_vcall_slot                              */
 199 /*                                                                  */
 200 /* Function     - This method is called by the arch independent         */
 201 /*            trampoline code to determine the vtable slot used by  */
 202 /*            the call which invoked the trampoline.                */
 203 /*                                                                  */
 204 /* Parameters   - code   - Pointer into caller code                 */
 205 /*                regs   - Register state at the point of the call  */
 206 /*                displacement - Out parameter which will receive   */
 207 /*                the displacement of the vtable slot               */
 208 /*                                                                  */
 209 /*------------------------------------------------------------------*/
 210
 211 gpointer
 212 mono_arch_get_vcall_slot (guint8 *code, gpointer *regs, int *displacement)
 213 {
 214         int reg, lkReg;
 215         guchar* base;
 216         unsigned short opcode;
 217         char *sp;
 218
 219         // We are passed sp instead of the register array
 220         sp = (char*)regs;
 221
 222         *displacement = 0;
 223
 224         opcode = *((unsigned short *) (code - 6));
 225         if (opcode == 0xc0e5)
 226                 /* This is the 'brasl' instruction */
 227                 return NULL;
 228
 229         /*-----------------------------------*/
 230         /* This is a bras r14,Rz instruction */
 231         /* If it's preceded by a LG Rx,d(Ry) */
 232         /* If Rz == 1 then this is virtual   */
 233         /* call.                             */
 234         /*-----------------------------------*/
 235         code    -= 6;
 236
 237         /*-----------------------------------*/
 238         /* If call is preceded by LGR then   */
 239         /* there's nothing to patch          */
 240         /*-----------------------------------*/
 241         if ((code[0] == 0xb9) &&
 242                 (code[1] == 0x04))
 243                 return NULL;
 244
 245         /*-----------------------------------*/
 246         /* We back up until we're pointing at*/
 247         /* the base/displacement portion of  */
 248         /* the LG instruction                */
 249         /*-----------------------------------*/
 250         lkReg    = code[5] & 0x0f;
 251
 252         /*-----------------------------------*/
 253         /* The LG instruction has format:    */
 254         /* E3x0ylllhh04 - where:             */
 255         /* x = Rx; y = Ry;                   */
 256         /* lll = low 12 bits of displacement */
 257         /* hh  = high 8 bits of displacement */
 258         /*-----------------------------------*/
 259         reg      = code[0] >> 4;
 260         *displacement = (code[2] << 12) +
 261                 ((code[0] & 0x0f) << 8) +
 262                 code[1];
 263
 264         if (reg > 5)
 265                 base = *((guchar **) (sp + S390_REG_SAVE_OFFSET +
 266                                                           sizeof(long)*(reg-6)));
 267         else
 268                 base = *((guchar **) ((sp - CREATE_STACK_SIZE) +
 269                                                           CREATE_GR_OFFSET +
 270                                                           sizeof(long)*(reg-2)));
 271         if (lkReg != 1)
 272                 /* Non virtual call */
 273                 return NULL;
 274
 275         return base;
 276 }
 277
 278 /*========================= End of Function ========================*/
 279
 280 /*------------------------------------------------------------------*/
 281 /*                                                                  */
 282 /* Name         - mono_arch_create_trampoline_code                            */
 283 /*                                                                  */
 284 /* Function     - Create the designated type of trampoline according*/
 285 /*                to the 'tramp_type' parameter.                    */
 286 /*                                                                  */
 287 /*------------------------------------------------------------------*/
 288
 289 guchar *
 290 mono_arch_create_trampoline_code (MonoTrampolineType tramp_type)
 291 {
 292
 293         guint8 *buf, *tramp, *code;
 294         int i, offset, lmfOffset;
 295
 296         /* Now we'll create in 'buf' the S/390 trampoline code. This
 297            is the trampoline code common to all methods  */
 298
 299         code = buf = mono_global_codeman_reserve(512);
 300
 301         /*-----------------------------------------------------------
 302           STEP 0: First create a non-standard function prologue with a
 303           stack size big enough to save our registers.
 304           -----------------------------------------------------------*/
 305
 306         s390_stmg (buf, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
 307         s390_lgr  (buf, s390_r11, s390_r15);
 308         s390_aghi (buf, STK_BASE, -CREATE_STACK_SIZE);
 309         s390_stg  (buf, s390_r11, 0, STK_BASE, 0);
 310         s390_stg  (buf, s390_r1, 0, STK_BASE, METHOD_SAVE_OFFSET);
 311         s390_stmg (buf, s390_r2, s390_r5, STK_BASE, CREATE_GR_OFFSET);
 312
 313         /* Save the FP registers */
 314         offset = CREATE_FP_OFFSET;
 315         for (i = s390_f0; i <= s390_f15; ++i) {
 316                 s390_std  (buf, i, 0, STK_BASE, offset);
 317                 offset += 8;
 318         }
 319
 320         /*----------------------------------------------------------
 321           STEP 1: call 'mono_get_lmf_addr()' to get the address of our
 322           LMF. We'll need to restore it after the call to
 323           's390_magic_trampoline' and before the call to the native
 324           method.
 325           ----------------------------------------------------------*/
 326
 327         s390_basr (buf, s390_r13, 0);
 328         s390_j    (buf, 6);
 329         s390_llong(buf, mono_get_lmf_addr);
 330         s390_lg   (buf, s390_r1, 0, s390_r13, 4);
 331         s390_basr (buf, s390_r14, s390_r1);
 332
 333         /*---------------------------------------------------------------*/
 334         /* we build the MonoLMF structure on the stack - see mini-s390.h */
 335         /* Keep in sync with the code in mono_arch_emit_prolog           */
 336         /*---------------------------------------------------------------*/
 337         lmfOffset = CREATE_STACK_SIZE - sizeof(MonoLMF);
 338
 339         s390_lgr   (buf, s390_r13, STK_BASE);
 340         s390_aghi  (buf, s390_r13, lmfOffset);
 341
 342         /*---------------------------------------------------------------*/
 343         /* Set lmf.lmf_addr = jit_tls->lmf                               */
 344         /*---------------------------------------------------------------*/
 345         s390_stg   (buf, s390_r2, 0, s390_r13,
 346                             G_STRUCT_OFFSET(MonoLMF, lmf_addr));
 347
 348         /*---------------------------------------------------------------*/
 349         /* Get current lmf                                               */
 350         /*---------------------------------------------------------------*/
 351         s390_lg    (buf, s390_r0, 0, s390_r2, 0);
 352
 353         /*---------------------------------------------------------------*/
 354         /* Set our lmf as the current lmf                                */
 355         /*---------------------------------------------------------------*/
 356         s390_stg   (buf, s390_r13, 0, s390_r2, 0);
 357
 358         /*---------------------------------------------------------------*/
 359         /* Have our lmf.previous_lmf point to the last lmf               */
 360         /*---------------------------------------------------------------*/
 361         s390_stg   (buf, s390_r0, 0, s390_r13,
 362                             G_STRUCT_OFFSET(MonoLMF, previous_lmf));
 363
 364         /*---------------------------------------------------------------*/
 365         /* save method info                                              */
 366         /*---------------------------------------------------------------*/
 367         s390_lg    (buf, s390_r1, 0, STK_BASE, METHOD_SAVE_OFFSET);
 368         s390_stg   (buf, s390_r1, 0, s390_r13,
 369                             G_STRUCT_OFFSET(MonoLMF, method));
 370
 371         /*---------------------------------------------------------------*/
 372         /* save the current SP                                           */
 373         /*---------------------------------------------------------------*/
 374         s390_lg    (buf, s390_r1, 0, STK_BASE, 0);
 375         s390_stg   (buf, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, ebp));
 376
 377         /*---------------------------------------------------------------*/
 378         /* save the current IP                                           */
 379         /*---------------------------------------------------------------*/
 380         if (tramp_type == MONO_TRAMPOLINE_JUMP) {
 381                 s390_lghi  (buf, s390_r1, 0);
 382         } else {
 383                 s390_lg    (buf, s390_r1, 0, s390_r1, S390_RET_ADDR_OFFSET);
 384                 //                      s390_la    (buf, s390_r1, 0, s390_r1, 0);
 385         }
 386         s390_stg   (buf, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, eip));
 387
 388         /*---------------------------------------------------------------*/
 389         /* Save general and floating point registers                     */
 390         /*---------------------------------------------------------------*/
 391         s390_stmg  (buf, s390_r2, s390_r12, s390_r13,
 392                             G_STRUCT_OFFSET(MonoLMF, gregs[2]));
 393         for (i = 0; i < 16; i++) {
 394                 s390_std  (buf, i, 0, s390_r13,
 395                                    G_STRUCT_OFFSET(MonoLMF, fregs[i]));
 396         }
 397
 398         /*---------------------------------------------------------------*/
 399         /* STEP 2: call the C trampoline function                        */
 400         /*---------------------------------------------------------------*/
 401
 402         /* Set arguments */
 403
 404         /* Arg 1: gssize *regs. We pass sp instead */
 405         s390_lgr  (buf, s390_r2, STK_BASE);
 406         s390_ahi  (buf, s390_r2, CREATE_STACK_SIZE);
 407
 408         /* Arg 2: code (next address to the instruction that called us) */
 409         if (tramp_type == MONO_TRAMPOLINE_JUMP) {
 410                 s390_lghi (buf, s390_r3, 0);
 411         } else {
 412                 s390_lg   (buf, s390_r3, 0, s390_r11, S390_RET_ADDR_OFFSET);
 413         }
 414
 415         /* Arg 3: MonoMethod *method. It was put in r1 by the
 416            method-specific trampoline code, and then saved before the call
 417            to mono_get_lmf_addr()'. */
 418         s390_lg  (buf, s390_r4, 0, STK_BASE, METHOD_SAVE_OFFSET);
 419
 420         /* Arg 4: trampoline address. Ignore for now */
 421
 422         /* Calculate call address and call the C trampoline. Return value will be in r2 */
 423         s390_basr (buf, s390_r13, 0);
 424         s390_j    (buf, 6);
 425         tramp = (guint8*)mono_get_trampoline_func (tramp_type);
 426         s390_llong (buf, tramp);
 427         s390_lg   (buf, s390_r1, 0, s390_r13, 4);
 428         s390_basr (buf, s390_r14, s390_r1);
 429
 430         /* OK, code address is now on r2. Move it to r1, so that we
 431            can restore r2 and use it from r1 later */
 432         s390_lgr  (buf, s390_r1, s390_r2);
 433
 434         /*----------------------------------------------------------
 435           STEP 3: Restore the LMF
 436           ----------------------------------------------------------*/
 437         restoreLMF(buf, STK_BASE, CREATE_STACK_SIZE);
 438
 439         /*----------------------------------------------------------
 440           STEP 4: call the compiled method
 441           ----------------------------------------------------------*/
 442
 443         /* Restore registers */
 444
 445         s390_lmg  (buf, s390_r2, s390_r5, STK_BASE, CREATE_GR_OFFSET);
 446
 447         /* Restore the FP registers */
 448         offset = CREATE_FP_OFFSET;
 449         for (i = s390_f0; i <= s390_f15; ++i) {
 450                 s390_ld  (buf, i, 0, STK_BASE, offset);
 451                 offset += 8;
 452         }
 453
 454         /* Restore stack pointer and jump to the code -
 455            R14 contains the return address to our caller */
 456         s390_lgr  (buf, STK_BASE, s390_r11);
 457         s390_lmg  (buf, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
 458
 459         if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT || tramp_type == MONO_TRAMPOLINE_GENERIC_CLASS_INIT)
 460                 s390_br (buf, s390_r14);
 461         else
 462                 s390_br (buf, s390_r1);
 463
 464         /* Flush instruction cache, since we've generated code */
 465         mono_arch_flush_icache (code, buf - code);
 466
 467         /* Sanity check */
 468         g_assert ((buf - code) <= 512);
 469
 470         return code;
 471 }
 472
 473 /*========================= End of Function ========================*/
 474
 475 /*------------------------------------------------------------------*/
 476 /*                                                                  */
 477 /* Name         - mono_arch_create_specific_trampoline                  */
 478 /*                                                                  */
 479 /* Function     - Creates the given kind of specific trampoline         */
 480 /*                                                                  */
 481 /*------------------------------------------------------------------*/
 482
 483 gpointer
 484 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
 485 {
 486         guint8 *code, *buf, *tramp;
 487         gint32 displace;
 488
 489         tramp = mono_get_trampoline_code (tramp_type);
 490
 491         /*----------------------------------------------------------*/
 492         /* This is the method-specific part of the trampoline. Its  */
 493         /* purpose is to provide the generic part with the          */
 494         /* MonoMethod *method pointer. We'll use r1 to keep it.     */
 495         /*----------------------------------------------------------*/
 496         code = buf = mono_domain_code_reserve (domain, SPECIFIC_TRAMPOLINE_SIZE);
 497
 498         s390_basr (buf, s390_r1, 0);
 499         s390_j    (buf, 6);
 500         s390_llong(buf, arg1);
 501         s390_lg   (buf, s390_r1, 0, s390_r1, 4);
 502         displace = (tramp - buf) / 2;
 503         s390_jcl  (buf, S390_CC_UN, displace);
 504
 505         /* Flush instruction cache, since we've generated code */
 506         mono_arch_flush_icache (code, buf - code);
 507
 508         /* Sanity check */
 509         g_assert ((buf - code) <= SPECIFIC_TRAMPOLINE_SIZE);
 510
 511         if (code_len)
 512                 *code_len = buf - code;
 513
 514         return code;
 515 }
 516
 517 /*========================= End of Function ========================*/
 518
 519 gpointer
 520 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 encoded_offset)
 521 {
 522         /* FIXME: implement! */
 523         g_assert_not_reached ();
 524         return NULL;
 525 }