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 /*------------------------------------------------------------------*/
 161 /*                                                                  */
 162 /* Name         - mono_arch_patch_plt_entry.                        */
 163 /*                                                                  */
 164 /* Function     - Patch a PLT entry - unused as yet.                */
 165 /*                                                                  */
 166 /*------------------------------------------------------------------*/
 167
 168 void
 169 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
 170 {
 171         g_assert_not_reached ();
 172 }
 173
 174 /*========================= End of Function ========================*/
 175
 176 /*------------------------------------------------------------------*/
 177 /*                                                                  */
 178 /* Name         - mono_arch_nullify_class_init_trampoline           */
 179 /*                                                                  */
 180 /* Function     - Nullify a call which calls a class init trampoline*/
 181 /*                                                                  */
 182 /*------------------------------------------------------------------*/
 183
 184 void
 185 mono_arch_nullify_class_init_trampoline (guint8 *code, mgreg_t *regs)
 186 {
 187         char patch[2] = {0x07, 0x00};
 188
 189         code = code - 2;
 190
 191         memcpy(code, patch, sizeof(patch));
 192 }
 193
 194 /*========================= End of Function ========================*/
 195
 196 /*------------------------------------------------------------------*/
 197 /*                                                                  */
 198 /* Name         - mono_arch_nullify_plt_entry                       */
 199 /*                                                                  */
 200 /* Function     - Nullify a PLT entry call.                         */
 201 /*                                                                  */
 202 /*------------------------------------------------------------------*/
 203
 204 void
 205 mono_arch_nullify_plt_entry (guint8 *code, mgreg_t *regs)
 206 {
 207         g_assert_not_reached ();
 208 }
 209
 210 /*========================= End of Function ========================*/
 211
 212 /*------------------------------------------------------------------*/
 213 /*                                                                  */
 214 /* Name         - mono_arch_get_vcall_slot                          */
 215 /*                                                                  */
 216 /* Function     - This method is called by the arch independent     */
 217 /*            trampoline code to determine the vtable slot used by  */
 218 /*            the call which invoked the trampoline.                */
 219 /*                                                                  */
 220 /* Parameters   - code   - Pointer into caller code                 */
 221 /*                regs   - Register state at the point of the call  */
 222 /*                displacement - Out parameter which will receive   */
 223 /*                the displacement of the vtable slot               */
 224 /*                                                                  */
 225 /*------------------------------------------------------------------*/
 226
 227 gpointer
 228 mono_arch_get_vcall_slot (guint8 *code, mgreg_t *regs, int *displacement)
 229 {
 230         int reg, lkReg;
 231         guchar* base;
 232         unsigned short opcode;
 233         char *sp;
 234         MonoLMF *lmf = (MonoLMF *) ((gchar *) regs - sizeof(MonoLMF));
 235
 236         // We are passed sp instead of the register array
 237 #if 0
 238         sp = (char *) regs;
 239 #endif
 240         sp = (char *) lmf->gregs[s390_r15];
 241
 242         *displacement = 0;
 243
 244         opcode = *((unsigned short *) (code - 6));
 245         if (opcode == 0xc0e5)
 246                 /* This is the 'brasl' instruction */
 247                 return NULL;
 248
 249         /*-----------------------------------*/
 250         /* This is a basr r14,Rz instruction */
 251         /* If it's preceded by a LG Rx,d(Ry) */
 252         /* If Rz == 1 then this is virtual   */
 253         /* call.                             */
 254         /*-----------------------------------*/
 255         code    -= 6;
 256
 257         /*-----------------------------------*/
 258         /* If call is preceded by LGR then   */
 259         /* there's nothing to patch          */
 260         /*-----------------------------------*/
 261         if ((code[0] == 0xb9) && (code[1] == 0x04))
 262                 return NULL;
 263
 264         /*-----------------------------------*/
 265         /* We back up until we're pointing at*/
 266         /* the base/displacement portion of  */
 267         /* the LG instruction                */
 268         /*-----------------------------------*/
 269         lkReg    = code[5] & 0x0f;
 270
 271         /*-----------------------------------*/
 272         /* The LG instruction has format:    */
 273         /* E3x0ylllhh04 - where:             */
 274         /* x = Rx; y = Ry;                   */
 275         /* lll = low 12 bits of displacement */
 276         /* hh  = high 8 bits of displacement */
 277         /*-----------------------------------*/
 278         reg      = code[0] >> 4;
 279         *displacement = (code[2] << 12) |
 280                         ((code[0] & 0x0f) << 8) |
 281                         code[1];
 282
 283         if (code[2] & 0x80)
 284                 *displacement |= 0xfff00000;
 285
 286         base = ((guchar *) lmf->gregs[reg]);
 287 #if 0
 288         if (reg > 5)
 289                 base = *((guchar **) (sp + S390_REG_SAVE_OFFSET +
 290                                                           sizeof(long)*(reg-6)));
 291         else
 292                 base = *((guchar **) ((sp - CREATE_STACK_SIZE) +
 293                                                           CREATE_GR_OFFSET +
 294                                                           sizeof(long)*(reg-2)));
 295 #endif
 296         if (lkReg != 1)
 297                 /* Non virtual call */
 298                 return NULL;
 299
 300         return base;
 301 }
 302
 303 /*========================= End of Function ========================*/
 304
 305 /*------------------------------------------------------------------*/
 306 /*                                                                  */
 307 /* Name         - mono_arch_create_trampoline_code                  */
 308 /*                                                                  */
 309 /* Function     - Create the designated type of trampoline according*/
 310 /*                to the 'tramp_type' parameter.                    */
 311 /*                                                                  */
 312 /*------------------------------------------------------------------*/
 313
 314 guchar *
 315 mono_arch_create_trampoline_code (MonoTrampolineType tramp_type)
 316 {
 317
 318         guint8 *buf, *tramp, *code;
 319         int i, offset, lmfOffset;
 320
 321         /* Now we'll create in 'buf' the S/390 trampoline code. This
 322            is the trampoline code common to all methods  */
 323
 324         code = buf = mono_global_codeman_reserve(512);
 325
 326         /*-----------------------------------------------------------
 327           STEP 0: First create a non-standard function prologue with a
 328           stack size big enough to save our registers.
 329           -----------------------------------------------------------*/
 330
 331         s390_stmg (buf, s390_r6, s390_r15, STK_BASE, S390_REG_SAVE_OFFSET);
 332         s390_lgr  (buf, s390_r11, s390_r15);
 333         s390_aghi (buf, STK_BASE, -CREATE_STACK_SIZE);
 334         s390_stg  (buf, s390_r11, 0, STK_BASE, 0);
 335         s390_stg  (buf, s390_r1, 0, STK_BASE, METHOD_SAVE_OFFSET);
 336         s390_stmg (buf, s390_r2, s390_r5, STK_BASE, CREATE_GR_OFFSET);
 337
 338         /* Save the FP registers */
 339         offset = CREATE_FP_OFFSET;
 340         for (i = s390_f0; i <= s390_f15; ++i) {
 341                 s390_std  (buf, i, 0, STK_BASE, offset);
 342                 offset += 8;
 343         }
 344
 345         /*----------------------------------------------------------
 346           STEP 1: call 'mono_get_lmf_addr()' to get the address of our
 347           LMF. We'll need to restore it after the call to
 348           's390_magic_trampoline' and before the call to the native
 349           method.
 350           ----------------------------------------------------------*/
 351
 352         s390_basr (buf, s390_r13, 0);
 353         s390_j    (buf, 6);
 354         s390_llong(buf, mono_get_lmf_addr);
 355         s390_lg   (buf, s390_r1, 0, s390_r13, 4);
 356         s390_basr (buf, s390_r14, s390_r1);
 357
 358         /*---------------------------------------------------------------*/
 359         /* we build the MonoLMF structure on the stack - see mini-s390.h */
 360         /* Keep in sync with the code in mono_arch_emit_prolog           */
 361         /*---------------------------------------------------------------*/
 362         lmfOffset = CREATE_STACK_SIZE - sizeof(MonoLMF);
 363
 364         s390_lgr   (buf, s390_r13, STK_BASE);
 365         s390_aghi  (buf, s390_r13, lmfOffset);
 366
 367         /*---------------------------------------------------------------*/
 368         /* Set lmf.lmf_addr = jit_tls->lmf                               */
 369         /*---------------------------------------------------------------*/
 370         s390_stg   (buf, s390_r2, 0, s390_r13,
 371                             G_STRUCT_OFFSET(MonoLMF, lmf_addr));
 372
 373         /*---------------------------------------------------------------*/
 374         /* Get current lmf                                               */
 375         /*---------------------------------------------------------------*/
 376         s390_lg    (buf, s390_r0, 0, s390_r2, 0);
 377
 378         /*---------------------------------------------------------------*/
 379         /* Set our lmf as the current lmf                                */
 380         /*---------------------------------------------------------------*/
 381         s390_stg   (buf, s390_r13, 0, s390_r2, 0);
 382
 383         /*---------------------------------------------------------------*/
 384         /* Have our lmf.previous_lmf point to the last lmf               */
 385         /*---------------------------------------------------------------*/
 386         s390_stg   (buf, s390_r0, 0, s390_r13,
 387                             G_STRUCT_OFFSET(MonoLMF, previous_lmf));
 388
 389         /*---------------------------------------------------------------*/
 390         /* save method info                                              */
 391         /*---------------------------------------------------------------*/
 392         s390_lg    (buf, s390_r1, 0, STK_BASE, METHOD_SAVE_OFFSET);
 393         s390_stg   (buf, s390_r1, 0, s390_r13,
 394                             G_STRUCT_OFFSET(MonoLMF, method));
 395
 396         /*---------------------------------------------------------------*/
 397         /* save the current SP                                           */
 398         /*---------------------------------------------------------------*/
 399         s390_lg    (buf, s390_r1, 0, STK_BASE, 0);
 400         s390_stg   (buf, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, ebp));
 401
 402         /*---------------------------------------------------------------*/
 403         /* save the current IP                                           */
 404         /*---------------------------------------------------------------*/
 405         if (tramp_type == MONO_TRAMPOLINE_JUMP) {
 406                 s390_lghi  (buf, s390_r1, 0);
 407         } else {
 408                 s390_lg    (buf, s390_r1, 0, s390_r1, S390_RET_ADDR_OFFSET);
 409                 //                      s390_la    (buf, s390_r1, 0, s390_r1, 0);
 410         }
 411         s390_stg   (buf, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, eip));
 412
 413         /*---------------------------------------------------------------*/
 414         /* Save general and floating point registers                     */
 415         /*---------------------------------------------------------------*/
 416         s390_mvc   (buf, 4*sizeof(gulong), s390_r13, G_STRUCT_OFFSET(MonoLMF, gregs[2]),
 417                     STK_BASE, CREATE_GR_OFFSET);
 418         s390_mvc   (buf, 10*sizeof(gulong), s390_r13, G_STRUCT_OFFSET(MonoLMF, gregs[6]),
 419                     s390_r11, S390_REG_SAVE_OFFSET);
 420
 421         /* Simply copy fpregs already saved above                        */
 422         s390_mvc   (buf, 16*sizeof(double), s390_r13, G_STRUCT_OFFSET(MonoLMF, fregs[0]),
 423                     STK_BASE, CREATE_FP_OFFSET);
 424
 425         /*---------------------------------------------------------------*/
 426         /* STEP 2: call the C trampoline function                        */
 427         /*---------------------------------------------------------------*/
 428
 429         /* Set arguments */
 430
 431         /* Arg 1: mgreg_t *regs. We pass sp instead */
 432         s390_la  (buf, s390_r2, 0, STK_BASE, CREATE_STACK_SIZE);
 433
 434         /* Arg 2: code (next address to the instruction that called us) */
 435         if (tramp_type == MONO_TRAMPOLINE_JUMP) {
 436                 s390_lghi (buf, s390_r3, 0);
 437         } else {
 438                 s390_lg   (buf, s390_r3, 0, s390_r11, S390_RET_ADDR_OFFSET);
 439         }
 440
 441         /* Arg 3: MonoMethod *method. It was put in r1 by the
 442            method-specific trampoline code, and then saved before the call
 443            to mono_get_lmf_addr()'. */
 444         s390_lg  (buf, s390_r4, 0, STK_BASE, METHOD_SAVE_OFFSET);
 445
 446         /* Arg 4: trampoline address. Ignore for now */
 447
 448         /* Calculate call address and call the C trampoline. Return value will be in r2 */
 449         s390_basr (buf, s390_r13, 0);
 450         s390_j    (buf, 6);
 451         tramp = (guint8*)mono_get_trampoline_func (tramp_type);
 452         s390_llong (buf, tramp);
 453         s390_lg   (buf, s390_r1, 0, s390_r13, 4);
 454         s390_basr (buf, s390_r14, s390_r1);
 455
 456         /* OK, code address is now on r2. Move it to r1, so that we
 457            can restore r2 and use it from r1 later */
 458         s390_lgr  (buf, s390_r1, s390_r2);
 459
 460         /*----------------------------------------------------------
 461           STEP 3: Restore the LMF
 462           ----------------------------------------------------------*/
 463         restoreLMF(buf, STK_BASE, CREATE_STACK_SIZE);
 464
 465         /*----------------------------------------------------------
 466           STEP 4: call the compiled method
 467           ----------------------------------------------------------*/
 468
 469         /* Restore registers */
 470
 471         s390_lmg  (buf, s390_r2, s390_r5, STK_BASE, CREATE_GR_OFFSET);
 472
 473         /* Restore the FP registers */
 474         offset = CREATE_FP_OFFSET;
 475         for (i = s390_f0; i <= s390_f15; ++i) {
 476                 s390_ld  (buf, i, 0, STK_BASE, offset);
 477                 offset += 8;
 478         }
 479
 480         /* Restore stack pointer and jump to the code -
 481            R14 contains the return address to our caller */
 482         s390_lgr  (buf, STK_BASE, s390_r11);
 483         s390_lmg  (buf, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
 484
 485         if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT || tramp_type == MONO_TRAMPOLINE_GENERIC_CLASS_INIT)
 486                 s390_br (buf, s390_r14);
 487         else
 488                 s390_br (buf, s390_r1);
 489
 490         /* Flush instruction cache, since we've generated code */
 491         mono_arch_flush_icache (code, buf - code);
 492
 493         /* Sanity check */
 494         g_assert ((buf - code) <= 512);
 495
 496         return code;
 497 }
 498
 499 /*========================= End of Function ========================*/
 500
 501 /*------------------------------------------------------------------*/
 502 /*                                                                  */
 503 /* Name         - mono_arch_create_specific_trampoline              */
 504 /*                                                                  */
 505 /* Function     - Creates the given kind of specific trampoline     */
 506 /*                                                                  */
 507 /*------------------------------------------------------------------*/
 508
 509 gpointer
 510 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
 511 {
 512         guint8 *code, *buf, *tramp;
 513         gint32 displace;
 514
 515         tramp = mono_get_trampoline_code (tramp_type);
 516
 517         /*----------------------------------------------------------*/
 518         /* This is the method-specific part of the trampoline. Its  */
 519         /* purpose is to provide the generic part with the          */
 520         /* MonoMethod *method pointer. We'll use r1 to keep it.     */
 521         /*----------------------------------------------------------*/
 522         code = buf = mono_domain_code_reserve (domain, SPECIFIC_TRAMPOLINE_SIZE);
 523
 524         s390_basr (buf, s390_r1, 0);
 525         s390_j    (buf, 6);
 526         s390_llong(buf, arg1);
 527         s390_lg   (buf, s390_r1, 0, s390_r1, 4);
 528         displace = (tramp - buf) / 2;
 529         s390_jcl  (buf, S390_CC_UN, displace);
 530
 531         /* Flush instruction cache, since we've generated code */
 532         mono_arch_flush_icache (code, buf - code);
 533
 534         /* Sanity check */
 535         g_assert ((buf - code) <= SPECIFIC_TRAMPOLINE_SIZE);
 536
 537         if (code_len)
 538                 *code_len = buf - code;
 539
 540         return code;
 541 }
 542
 543 /*========================= End of Function ========================*/
 544
 545 /*------------------------------------------------------------------*/
 546 /*                                                                  */
 547 /* Name         - mono_arch_create_rgctx_lazy_fetch_trampoline      */
 548 /*                                                                  */
 549 /* Function     -                                                   */
 550 /*                                                                  */
 551 /*------------------------------------------------------------------*/
 552
 553 gpointer
 554 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 encoded_offset)
 555 {
 556         /* FIXME: implement! */
 557         g_assert_not_reached ();
 558         return NULL;
 559 }
 560
 561 /*========================= End of Function ========================*/