mono/mini/tramp-arm64.c

   1 /**
   2  * \file
   3  * JIT trampoline code for ARM64
   4  *
   5  * Copyright 2013 Xamarin Inc
   6  *
   7  * Based on tramp-arm.c:
   8  *
   9  * Authors:
  10  *   Paolo Molaro (lupus@ximian.com)
  11  *
  12  * (C) 2001-2003 Ximian, Inc.
  13  * Copyright 2003-2011 Novell Inc
  14  * Copyright 2011 Xamarin Inc
  15  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
  16  */
  17
  18 #include "mini.h"
  19 #include "mini-runtime.h"
  20 #include "debugger-agent.h"
  21
  22 #include <mono/arch/arm64/arm64-codegen.h>
  23 #include <mono/metadata/abi-details.h>
  24
  25 #ifndef DISABLE_INTERPRETER
  26 #include "interp/interp.h"
  27 #endif
  28
  29
  30 void
  31 mono_arch_patch_callsite (guint8 *method_start, guint8 *code_ptr, guint8 *addr)
  32 {
  33         mono_arm_patch (code_ptr - 4, addr, MONO_R_ARM64_BL);
  34         mono_arch_flush_icache (code_ptr - 4, 4);
  35 }
  36
  37 void
  38 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, host_mgreg_t *regs, guint8 *addr)
  39 {
  40         guint32 ins;
  41         guint64 slot_addr;
  42         int disp;
  43
  44         /*
  45          * Decode the address loaded by the PLT entry emitted by arch_emit_plt_entry () in
  46          * aot-compiler.c
  47          */
  48
  49         /* adrp */
  50         ins = ((guint32*)code) [0];
  51         g_assert (((ins >> 24) & 0x1f) == 0x10);
  52         disp = (((ins >> 5) & 0x7ffff) << 2) | ((ins >> 29) & 0x3);
  53         /* FIXME: disp is signed */
  54         g_assert ((disp >> 20) == 0);
  55
  56         slot_addr = ((guint64)code + (disp << 12)) & ~0xfff;
  57
  58         /* add x16, x16, :lo12:got */
  59         ins = ((guint32*)code) [1];
  60         g_assert (((ins >> 22) & 0x3) == 0);
  61         slot_addr += (ins >> 10) & 0xfff;
  62
  63         /* ldr x16, [x16, <offset>] */
  64         ins = ((guint32*)code) [2];
  65         g_assert (((ins >> 24) & 0x3f) == 0x39);
  66         slot_addr += ((ins >> 10) & 0xfff) * 8;
  67
  68         g_assert (*(guint64*)slot_addr);
  69         *(gpointer*)slot_addr = addr;
  70 }
  71
  72 guint8*
  73 mono_arch_get_call_target (guint8 *code)
  74 {
  75         guint32 imm;
  76         int disp;
  77
  78         code -= 4;
  79
  80         imm = *(guint32*)code;
  81         /* Should be a b/bl */
  82         g_assert (((imm >> 26) & 0x7) == 0x5);
  83
  84         disp = (imm & 0x3ffffff);
  85         if ((disp >> 25) != 0)
  86                 /* Negative, sing extend to 32 bits */
  87                 disp = disp | 0xfc000000;
  88
  89         return code + (disp * 4);
  90 }
  91
  92 guint32
  93 mono_arch_get_plt_info_offset (guint8 *plt_entry, host_mgreg_t *regs, guint8 *code)
  94 {
  95         /* The offset is stored as the 5th word of the plt entry */
  96         return ((guint32*)plt_entry) [4];
  97 }
  98
  99 #ifndef DISABLE_JIT
 100
 101 guchar*
 102 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
 103 {
 104         guint8 *code, *buf, *tramp, *labels [16];
 105         int i, buf_len, imm;
 106         int frame_size, offset, gregs_offset, num_fregs, fregs_offset, arg_offset, lmf_offset, res_offset;
 107         guint64 gregs_regset;
 108         GSList *unwind_ops = NULL;
 109         MonoJumpInfo *ji = NULL;
 110         char *tramp_name;
 111
 112         buf_len = 768;
 113         buf = code = mono_global_codeman_reserve (buf_len);
 114
 115         /*
 116          * We are getting called by a specific trampoline, ip1 contains the trampoline argument.
 117          */
 118
 119         /* Compute stack frame size and offsets */
 120         offset = 0;
 121         /* frame block */
 122         offset += 2 * 8;
 123         /* gregs */
 124         gregs_offset = offset;
 125         offset += 32 * 8;
 126         /* fregs */
 127         // FIXME: Save 128 bits
 128         /* Only have to save the argument regs */
 129         num_fregs = 8;
 130         fregs_offset = offset;
 131         offset += num_fregs * 8;
 132         /* arg */
 133         arg_offset = offset;
 134         offset += 8;
 135         /* result */
 136         res_offset = offset;
 137         offset += 8;
 138         /* LMF */
 139         lmf_offset = offset;
 140         offset += sizeof (MonoLMF);
 141         //offset += 22 * 8;
 142         frame_size = ALIGN_TO (offset, MONO_ARCH_FRAME_ALIGNMENT);
 143
 144         /* Setup stack frame */
 145         imm = frame_size;
 146         mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, 0);
 147         while (imm > 256) {
 148                 arm_subx_imm (code, ARMREG_SP, ARMREG_SP, 256);
 149                 imm -= 256;
 150                 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, frame_size - imm);
 151         }
 152         arm_subx_imm (code, ARMREG_SP, ARMREG_SP, imm);
 153         mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, frame_size);
 154
 155         arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 156         mono_add_unwind_op_offset (unwind_ops, code, buf, ARMREG_LR, -frame_size + 8);
 157         mono_add_unwind_op_offset (unwind_ops, code, buf, ARMREG_FP, -frame_size);
 158
 159         arm_movspx (code, ARMREG_FP, ARMREG_SP);
 160         mono_add_unwind_op_def_cfa_reg (unwind_ops, code, buf, ARMREG_FP);
 161
 162         /* Save gregs */
 163         // FIXME: Optimize this
 164         gregs_regset = ~((1 << ARMREG_FP) | (1 << ARMREG_SP));
 165         code = mono_arm_emit_store_regarray (code, gregs_regset, ARMREG_FP, gregs_offset);
 166         /* Save fregs */
 167         for (i = 0; i < num_fregs; ++i)
 168                 arm_strfpx (code, i, ARMREG_FP, fregs_offset + (i * 8));
 169         /* Save trampoline arg */
 170         arm_strx (code, ARMREG_IP1, ARMREG_FP, arg_offset);
 171
 172         /* Setup LMF */
 173         arm_addx_imm (code, ARMREG_IP0, ARMREG_FP, lmf_offset);
 174         code = mono_arm_emit_store_regset (code, MONO_ARCH_LMF_REGS, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, gregs));
 175         /* Save caller fp */
 176         arm_ldrx (code, ARMREG_IP1, ARMREG_FP, 0);
 177         arm_strx (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, gregs) + (MONO_ARCH_LMF_REG_FP * 8));
 178         /* Save caller sp */
 179         arm_movx (code, ARMREG_IP1, ARMREG_FP);
 180         imm = frame_size;
 181         while (imm > 256) {
 182                 arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, 256);
 183                 imm -= 256;
 184         }
 185         arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, imm);
 186         arm_strx (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, gregs) + (MONO_ARCH_LMF_REG_SP * 8));
 187         /* Save caller pc */
 188         if (tramp_type == MONO_TRAMPOLINE_JUMP)
 189                 arm_movx (code, ARMREG_LR, ARMREG_RZR);
 190         else
 191                 arm_ldrx (code, ARMREG_LR, ARMREG_FP, 8);
 192         arm_strx (code, ARMREG_LR, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, pc));
 193
 194         /* Save LMF */
 195         /* Similar to emit_save_lmf () */
 196         if (aot) {
 197                 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
 198         } else {
 199                 tramp = (guint8*)mono_get_lmf_addr;
 200                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
 201         }
 202         arm_blrx (code, ARMREG_IP0);
 203         /* r0 contains the address of the tls slot holding the current lmf */
 204         /* ip0 = lmf */
 205         arm_addx_imm (code, ARMREG_IP0, ARMREG_FP, lmf_offset);
 206         /* lmf->lmf_addr = lmf_addr */
 207         arm_strx (code, ARMREG_R0, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
 208         /* lmf->previous_lmf = *lmf_addr */
 209         arm_ldrx (code, ARMREG_IP1, ARMREG_R0, 0);
 210         arm_strx (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
 211         /* *lmf_addr = lmf */
 212         arm_strx (code, ARMREG_IP0, ARMREG_R0, 0);
 213
 214         /* Call the C trampoline function */
 215         /* Arg 1 = gregs */
 216         arm_addx_imm (code, ARMREG_R0, ARMREG_FP, gregs_offset);
 217         /* Arg 2 = caller */
 218         if (tramp_type == MONO_TRAMPOLINE_JUMP)
 219                 arm_movx (code, ARMREG_R1, ARMREG_RZR);
 220         else
 221                 arm_ldrx (code, ARMREG_R1, ARMREG_FP, gregs_offset + (ARMREG_LR * 8));
 222         /* Arg 3 = arg */
 223         if (MONO_TRAMPOLINE_TYPE_HAS_ARG (tramp_type))
 224                 /* Passed in r0 */
 225                 arm_ldrx (code, ARMREG_R2, ARMREG_FP, gregs_offset + (ARMREG_R0 * 8));
 226         else
 227                 arm_ldrx (code, ARMREG_R2, ARMREG_FP, arg_offset);
 228         /* Arg 4 = trampoline addr */
 229         arm_movx (code, ARMREG_R3, ARMREG_RZR);
 230
 231         if (aot) {
 232                 char *icall_name = g_strdup_printf ("trampoline_func_%d", tramp_type);
 233                 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, icall_name);
 234         } else {
 235                 tramp = (guint8*)mono_get_trampoline_func (tramp_type);
 236                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
 237         }
 238         arm_blrx (code, ARMREG_IP0);
 239
 240         /* Save the result */
 241         arm_strx (code, ARMREG_R0, ARMREG_FP, res_offset);
 242
 243         /* Restore LMF */
 244         /* Similar to emit_restore_lmf () */
 245         /* Clobbers ip0/ip1 */
 246         /* ip0 = lmf */
 247         arm_addx_imm (code, ARMREG_IP0, ARMREG_FP, lmf_offset);
 248         /* ip1 = lmf->previous_lmf */
 249         arm_ldrx (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
 250         /* ip0 = lmf->lmf_addr */
 251         arm_ldrx (code, ARMREG_IP0, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
 252         /* *lmf_addr = previous_lmf */
 253         arm_strx (code, ARMREG_IP1, ARMREG_IP0, 0);
 254
 255         /* Check for thread interruption */
 256         /* This is not perf critical code so no need to check the interrupt flag */
 257         if (aot) {
 258                 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_force_interruption_checkpoint_noraise");
 259         } else {
 260                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)mono_thread_force_interruption_checkpoint_noraise);
 261         }
 262         arm_blrx (code, ARMREG_IP0);
 263         /* Check whenever there is an exception to be thrown */
 264         labels [0] = code;
 265         arm_cbnzx (code, ARMREG_R0, 0);
 266
 267         /* Normal case */
 268
 269         /* Restore gregs */
 270         /* Only have to load the argument regs (r0..r8) and the rgctx reg */
 271         code = mono_arm_emit_load_regarray (code, 0x1ff | (1 << ARMREG_LR) | (1 << MONO_ARCH_RGCTX_REG), ARMREG_FP, gregs_offset);
 272         /* Restore fregs */
 273         for (i = 0; i < num_fregs; ++i)
 274                 arm_ldrfpx (code, i, ARMREG_FP, fregs_offset + (i * 8));
 275
 276         /* Load the result */
 277         arm_ldrx (code, ARMREG_IP1, ARMREG_FP, res_offset);
 278
 279         /* These trampolines return a value */
 280         if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
 281                 arm_movx (code, ARMREG_R0, ARMREG_IP1);
 282
 283         /* Cleanup frame */
 284         code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0)));
 285
 286         if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
 287                 arm_retx (code, ARMREG_LR);
 288         else
 289                 arm_brx (code, ARMREG_IP1);
 290
 291         /* Exception case */
 292         mono_arm_patch (labels [0], code, MONO_R_ARM64_CBZ);
 293
 294         /*
 295          * We have an exception we want to throw in the caller's frame, so pop
 296          * the trampoline frame and throw from the caller.
 297          */
 298         code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0)));
 299         /* We are in the parent frame, the exception is in x0 */
 300         /*
 301          * EH is initialized after trampolines, so get the address of the variable
 302          * which contains throw_exception, and load it from there.
 303          */
 304         if (aot) {
 305                 /* Not really a jit icall */
 306                 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "rethrow_preserve_exception_addr");
 307         } else {
 308                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)mono_get_rethrow_preserve_exception_addr ());
 309         }
 310         arm_ldrx (code, ARMREG_IP0, ARMREG_IP0, 0);
 311         /* lr contains the return address, the trampoline will use it as the throw site */
 312         arm_brx (code, ARMREG_IP0);
 313
 314         g_assert ((code - buf) < buf_len);
 315         mono_arch_flush_icache (buf, code - buf);
 316         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL));
 317
 318         if (info) {
 319                 tramp_name = mono_get_generic_trampoline_name (tramp_type);
 320                 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
 321                 g_free (tramp_name);
 322         }
 323
 324         return buf;
 325 }
 326
 327 gpointer
 328 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
 329 {
 330         guint8 *code, *buf, *tramp;
 331         int buf_len = 64;
 332
 333         /*
 334          * Return a trampoline which calls generic trampoline TRAMP_TYPE passing in ARG1.
 335          * Pass the argument in ip1, clobbering ip0.
 336          */
 337         tramp = mono_get_trampoline_code (tramp_type);
 338
 339         buf = code = mono_domain_code_reserve (domain, buf_len);
 340
 341         code = mono_arm_emit_imm64 (code, ARMREG_IP1, (guint64)arg1);
 342         code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
 343
 344         arm_brx (code, ARMREG_IP0);
 345
 346         g_assert ((code - buf) < buf_len);
 347         mono_arch_flush_icache (buf, code - buf);
 348         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_SPECIFIC_TRAMPOLINE, mono_get_generic_trampoline_simple_name (tramp_type)));
 349
 350         if (code_len)
 351                 *code_len = code - buf;
 352
 353         return buf;
 354 }
 355
 356 gpointer
 357 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
 358 {
 359         guint8 *code, *start;
 360         guint32 size = 32;
 361         MonoDomain *domain = mono_domain_get ();
 362
 363         start = code = mono_domain_code_reserve (domain, size);
 364         code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
 365         arm_addx_imm (code, ARMREG_R0, ARMREG_R0, MONO_ABI_SIZEOF (MonoObject));
 366         arm_brx (code, ARMREG_IP0);
 367
 368         g_assert ((code - start) <= size);
 369         mono_arch_flush_icache (start, code - start);
 370         MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_UNBOX_TRAMPOLINE, m));
 371         return start;
 372 }
 373
 374 gpointer
 375 mono_arch_get_static_rgctx_trampoline (gpointer arg, gpointer addr)
 376 {
 377         guint8 *code, *start;
 378         guint32 buf_len = 32;
 379         MonoDomain *domain = mono_domain_get ();
 380
 381         start = code = mono_domain_code_reserve (domain, buf_len);
 382         code = mono_arm_emit_imm64 (code, MONO_ARCH_RGCTX_REG, (guint64)arg);
 383         code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
 384         arm_brx (code, ARMREG_IP0);
 385
 386         g_assert ((code - start) <= buf_len);
 387
 388         mono_arch_flush_icache (start, code - start);
 389         MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL));
 390
 391         return start;
 392 }
 393
 394 gpointer
 395 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
 396 {
 397         guint8 *code, *buf;
 398         int buf_size;
 399         int i, depth, index, njumps;
 400         gboolean is_mrgctx;
 401         guint8 **rgctx_null_jumps;
 402         MonoJumpInfo *ji = NULL;
 403         GSList *unwind_ops = NULL;
 404         guint8 *tramp;
 405         guint32 code_len;
 406
 407         is_mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
 408         index = MONO_RGCTX_SLOT_INDEX (slot);
 409         if (is_mrgctx)
 410                 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
 411         for (depth = 0; ; ++depth) {
 412                 int size = mono_class_rgctx_get_array_size (depth, is_mrgctx);
 413
 414                 if (index < size - 1)
 415                         break;
 416                 index -= size - 1;
 417         }
 418
 419         buf_size = 64 + 16 * depth;
 420         code = buf = mono_global_codeman_reserve (buf_size);
 421
 422         rgctx_null_jumps = g_malloc0 (sizeof (guint8*) * (depth + 2));
 423         njumps = 0;
 424
 425         /* The vtable/mrgtx is in R0 */
 426         g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
 427
 428         if (is_mrgctx) {
 429                 /* get mrgctx ptr */
 430                 arm_movx (code, ARMREG_IP1, ARMREG_R0);
 431         } else {
 432                 /* load rgctx ptr from vtable */
 433                 code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_R0, MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context));
 434                 /* is the rgctx ptr null? */
 435                 /* if yes, jump to actual trampoline */
 436                 rgctx_null_jumps [njumps ++] = code;
 437                 arm_cbzx (code, ARMREG_IP1, 0);
 438         }
 439
 440         for (i = 0; i < depth; ++i) {
 441                 /* load ptr to next array */
 442                 if (is_mrgctx && i == 0) {
 443                         code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT);
 444                 } else {
 445                         code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, 0);
 446                 }
 447                 /* is the ptr null? */
 448                 /* if yes, jump to actual trampoline */
 449                 rgctx_null_jumps [njumps ++] = code;
 450                 arm_cbzx (code, ARMREG_IP1, 0);
 451         }
 452
 453         /* fetch slot */
 454         code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, sizeof (gpointer) * (index + 1));
 455         /* is the slot null? */
 456         /* if yes, jump to actual trampoline */
 457         rgctx_null_jumps [njumps ++] = code;
 458         arm_cbzx (code, ARMREG_IP1, 0);
 459         /* otherwise return, result is in IP1 */
 460         arm_movx (code, ARMREG_R0, ARMREG_IP1);
 461         arm_brx (code, ARMREG_LR);
 462
 463         g_assert (njumps <= depth + 2);
 464         for (i = 0; i < njumps; ++i)
 465                 mono_arm_patch (rgctx_null_jumps [i], code, MONO_R_ARM64_CBZ);
 466
 467         g_free (rgctx_null_jumps);
 468
 469         /* Slowpath */
 470
 471         /* Call mono_rgctx_lazy_fetch_trampoline (), passing in the slot as argument */
 472         /* The vtable/mrgctx is still in R0 */
 473         if (aot) {
 474                 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
 475         } else {
 476                 tramp = (guint8*)mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), &code_len);
 477                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
 478         }
 479         arm_brx (code, ARMREG_IP0);
 480
 481         mono_arch_flush_icache (buf, code - buf);
 482         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL));
 483
 484         g_assert (code - buf <= buf_size);
 485
 486         if (info) {
 487                 char *name = mono_get_rgctx_fetch_trampoline_name (slot);
 488                 *info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);
 489                 g_free (name);
 490         }
 491
 492         return buf;
 493 }
 494
 495 gpointer
 496 mono_arch_create_general_rgctx_lazy_fetch_trampoline (MonoTrampInfo **info, gboolean aot)
 497 {
 498         guint8 *code, *buf;
 499         int tramp_size;
 500         MonoJumpInfo *ji = NULL;
 501         GSList *unwind_ops = NULL;
 502
 503         g_assert (aot);
 504
 505         tramp_size = 32;
 506
 507         code = buf = mono_global_codeman_reserve (tramp_size);
 508
 509         mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, 0);
 510
 511         // FIXME: Currently, we always go to the slow path.
 512         /* Load trampoline addr */
 513         arm_ldrx (code, ARMREG_IP0, MONO_ARCH_RGCTX_REG, 8);
 514         /* The vtable/mrgctx is in R0 */
 515         g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
 516         arm_brx (code, ARMREG_IP0);
 517
 518         mono_arch_flush_icache (buf, code - buf);
 519         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL));
 520
 521         g_assert (code - buf <= tramp_size);
 522
 523         if (info)
 524                 *info = mono_tramp_info_create ("rgctx_fetch_trampoline_general", buf, code - buf, ji, unwind_ops);
 525
 526         return buf;
 527 }
 528
 529 /*
 530  * mono_arch_create_sdb_trampoline:
 531  *
 532  *   Return a trampoline which captures the current context, passes it to
 533  * mini_get_dbg_callbacks ()->single_step_from_context ()/mini_get_dbg_callbacks ()->breakpoint_from_context (),
 534  * then restores the (potentially changed) context.
 535  */
 536 guint8*
 537 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
 538 {
 539         int tramp_size = 512;
 540         int offset, imm, frame_size, ctx_offset;
 541         guint64 gregs_regset;
 542         guint8 *code, *buf;
 543         GSList *unwind_ops = NULL;
 544         MonoJumpInfo *ji = NULL;
 545
 546         code = buf = mono_global_codeman_reserve (tramp_size);
 547
 548         /* Compute stack frame size and offsets */
 549         offset = 0;
 550         /* frame block */
 551         offset += 2 * 8;
 552         /* MonoContext */
 553         ctx_offset = offset;
 554         offset += sizeof (MonoContext);
 555         offset = ALIGN_TO (offset, MONO_ARCH_FRAME_ALIGNMENT);
 556         frame_size = offset;
 557
 558         // FIXME: Unwind info
 559
 560         /* Setup stack frame */
 561         imm = frame_size;
 562         while (imm > 256) {
 563                 arm_subx_imm (code, ARMREG_SP, ARMREG_SP, 256);
 564                 imm -= 256;
 565         }
 566         arm_subx_imm (code, ARMREG_SP, ARMREG_SP, imm);
 567         arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 568         arm_movspx (code, ARMREG_FP, ARMREG_SP);
 569
 570         /* Initialize a MonoContext structure on the stack */
 571         /* No need to save fregs */
 572         gregs_regset = ~((1 << ARMREG_FP) | (1 << ARMREG_SP));
 573         code = mono_arm_emit_store_regarray (code, gregs_regset, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs));
 574         /* Save caller fp */
 575         arm_ldrx (code, ARMREG_IP1, ARMREG_FP, 0);
 576         arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_FP * 8));
 577         /* Save caller sp */
 578         arm_movx (code, ARMREG_IP1, ARMREG_FP);
 579         imm = frame_size;
 580         while (imm > 256) {
 581                 arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, 256);
 582                 imm -= 256;
 583         }
 584         arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, imm);
 585         arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_SP * 8));
 586         /* Save caller ip */
 587         arm_ldrx (code, ARMREG_IP1, ARMREG_FP, 8);
 588         arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, pc));
 589
 590         /* Call the single step/breakpoint function in sdb */
 591         /* Arg1 = ctx */
 592         arm_addx_imm (code, ARMREG_R0, ARMREG_FP, ctx_offset);
 593         if (aot) {
 594                 if (single_step)
 595                         code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "debugger_agent_single_step_from_context");
 596                 else
 597                         code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "debugger_agent_breakpoint_from_context");
 598         } else {
 599                 void (*addr) (MonoContext *ctx) = single_step ? mini_get_dbg_callbacks ()->single_step_from_context : mini_get_dbg_callbacks ()->breakpoint_from_context;
 600
 601                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
 602         }
 603         arm_blrx (code, ARMREG_IP0);
 604
 605         /* Restore ctx */
 606         /* Save fp/pc into the frame block */
 607         arm_ldrx (code, ARMREG_IP0, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_FP * 8));
 608         arm_strx (code, ARMREG_IP0, ARMREG_FP, 0);
 609         arm_ldrx (code, ARMREG_IP0, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, pc));
 610         arm_strx (code, ARMREG_IP0, ARMREG_FP, 8);
 611         gregs_regset = ~((1 << ARMREG_FP) | (1 << ARMREG_SP));
 612         code = mono_arm_emit_load_regarray (code, gregs_regset, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs));
 613
 614         code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0) | (1 << ARMREG_IP1)));
 615
 616         arm_retx (code, ARMREG_LR);
 617
 618         mono_arch_flush_icache (code, code - buf);
 619         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL));
 620         g_assert (code - buf <= tramp_size);
 621
 622         const char *tramp_name = single_step ? "sdb_single_step_trampoline" : "sdb_breakpoint_trampoline";
 623         *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
 624
 625         return buf;
 626 }
 627
 628 /*
 629  * mono_arch_get_interp_to_native_trampoline:
 630  *
 631  *   See tramp-amd64.c for documentation.
 632  */
 633 gpointer
 634 mono_arch_get_interp_to_native_trampoline (MonoTrampInfo **info)
 635 {
 636 #ifndef DISABLE_INTERPRETER
 637         guint8 *start = NULL, *code;
 638         guint8 *label_start_copy, *label_exit_copy;
 639         MonoJumpInfo *ji = NULL;
 640         GSList *unwind_ops = NULL;
 641         int buf_len, i, framesize = 0, off_methodargs, off_targetaddr;
 642
 643         buf_len = 512 + 1024;
 644         start = code = (guint8 *) mono_global_codeman_reserve (buf_len);
 645
 646         /* allocate frame */
 647         framesize += 2 * sizeof (host_mgreg_t);
 648
 649         off_methodargs = framesize;
 650         framesize += sizeof (host_mgreg_t);
 651
 652         off_targetaddr = framesize;
 653         framesize += sizeof (host_mgreg_t);
 654
 655         framesize = ALIGN_TO (framesize, MONO_ARCH_FRAME_ALIGNMENT);
 656
 657         arm_subx_imm (code, ARMREG_SP, ARMREG_SP, framesize);
 658         arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 659         arm_movspx (code, ARMREG_FP, ARMREG_SP);
 660
 661         /* save CallContext* onto stack */
 662         arm_strx (code, ARMREG_R1, ARMREG_FP, off_methodargs);
 663
 664         /* save target address onto stack */
 665         arm_strx (code, ARMREG_R0, ARMREG_FP, off_targetaddr);
 666
 667         /* allocate the stack space necessary for the call */
 668         arm_ldrx (code, ARMREG_R0, ARMREG_R1, MONO_STRUCT_OFFSET (CallContext, stack_size));
 669         arm_movspx (code, ARMREG_IP0, ARMREG_SP);
 670         arm_subx (code, ARMREG_IP0, ARMREG_IP0, ARMREG_R0);
 671         arm_movspx (code, ARMREG_SP, ARMREG_IP0);
 672
 673         /* copy stack from the CallContext, IP0 = dest, IP1 = source */
 674         arm_movspx (code, ARMREG_IP0, ARMREG_SP);
 675         arm_ldrx (code, ARMREG_IP1, ARMREG_R1, MONO_STRUCT_OFFSET (CallContext, stack));
 676
 677         label_start_copy = code;
 678
 679         arm_cmpx_imm (code, ARMREG_R0, 0);
 680         label_exit_copy = code;
 681         arm_bcc (code, ARMCOND_EQ, 0);
 682         arm_ldrx (code, ARMREG_R2, ARMREG_IP1, 0);
 683         arm_strx (code, ARMREG_R2, ARMREG_IP0, 0);
 684         arm_addx_imm (code, ARMREG_IP0, ARMREG_IP0, sizeof (host_mgreg_t));
 685         arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, sizeof (host_mgreg_t));
 686         arm_subx_imm (code, ARMREG_R0, ARMREG_R0, sizeof (host_mgreg_t));
 687         arm_b (code, label_start_copy);
 688         mono_arm_patch (label_exit_copy, code, MONO_R_ARM64_BCC);
 689
 690         /* Load CallContext* into IP0 */
 691         arm_ldrx (code, ARMREG_IP0, ARMREG_FP, off_methodargs);
 692
 693         /* set all general purpose registers from CallContext */
 694         for (i = 0; i < PARAM_REGS + 1; i++)
 695                 arm_ldrx (code, i, ARMREG_IP0, MONO_STRUCT_OFFSET (CallContext, gregs) + i * sizeof (host_mgreg_t));
 696
 697         /* set all floating registers from CallContext  */
 698         for (i = 0; i < FP_PARAM_REGS; i++)
 699                 arm_ldrfpx (code, i, ARMREG_IP0, MONO_STRUCT_OFFSET (CallContext, fregs) + i * sizeof (double));
 700
 701         /* load target addr */
 702         arm_ldrx (code, ARMREG_IP0, ARMREG_FP, off_targetaddr);
 703
 704         /* call into native function */
 705         arm_blrx (code, ARMREG_IP0);
 706
 707         /* load CallContext* */
 708         arm_ldrx (code, ARMREG_IP0, ARMREG_FP, off_methodargs);
 709
 710         /* set all general purpose registers to CallContext */
 711         for (i = 0; i < PARAM_REGS; i++)
 712                 arm_strx (code, i, ARMREG_IP0, MONO_STRUCT_OFFSET (CallContext, gregs) + i * sizeof (host_mgreg_t));
 713
 714         /* set all floating registers to CallContext  */
 715         for (i = 0; i < FP_PARAM_REGS; i++)
 716                 arm_strfpx (code, i, ARMREG_IP0, MONO_STRUCT_OFFSET (CallContext, fregs) + i * sizeof (double));
 717
 718         arm_movspx (code, ARMREG_SP, ARMREG_FP);
 719         arm_ldpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 720         arm_addx_imm (code, ARMREG_SP, ARMREG_SP, framesize);
 721         arm_retx (code, ARMREG_LR);
 722
 723         g_assert (code - start < buf_len);
 724
 725         mono_arch_flush_icache (start, code - start);
 726         MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_HELPER, NULL));
 727
 728         if (info)
 729                 *info = mono_tramp_info_create ("interp_to_native_trampoline", start, code - start, ji, unwind_ops);
 730
 731         return start;
 732 #else
 733         g_assert_not_reached ();
 734         return NULL;
 735 #endif /* DISABLE_INTERPRETER */
 736 }
 737
 738 gpointer
 739 mono_arch_get_native_to_interp_trampoline (MonoTrampInfo **info)
 740 {
 741 #ifndef DISABLE_INTERPRETER
 742         guint8 *start = NULL, *code;
 743         MonoJumpInfo *ji = NULL;
 744         GSList *unwind_ops = NULL;
 745         int buf_len, i;
 746         int framesize, offset, ccontext_offset;
 747
 748         buf_len = 512;
 749         start = code = (guint8 *) mono_global_codeman_reserve (buf_len);
 750
 751         /* Allocate frame (FP + LR + CallContext) */
 752         offset = 2 * sizeof (host_mgreg_t);
 753         ccontext_offset = offset;
 754         offset += sizeof (CallContext);
 755         framesize = ALIGN_TO (offset, MONO_ARCH_FRAME_ALIGNMENT);
 756
 757         mono_add_unwind_op_def_cfa (unwind_ops, code, start, ARMREG_SP, 0);
 758
 759         arm_subx_imm (code, ARMREG_SP, ARMREG_SP, framesize);
 760         mono_add_unwind_op_def_cfa_offset (unwind_ops, code, start, framesize);
 761
 762         arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 763         mono_add_unwind_op_offset (unwind_ops, code, start, ARMREG_LR, -framesize + 8);
 764         mono_add_unwind_op_offset (unwind_ops, code, start, ARMREG_FP, -framesize);
 765
 766         arm_movspx (code, ARMREG_FP, ARMREG_SP);
 767         mono_add_unwind_op_def_cfa_reg (unwind_ops, code, start, ARMREG_FP);
 768
 769         /* save all general purpose registers into the CallContext */
 770         for (i = 0; i < PARAM_REGS + 1; i++)
 771                 arm_strx (code, i, ARMREG_FP, ccontext_offset + MONO_STRUCT_OFFSET (CallContext, gregs) + i * sizeof (host_mgreg_t));
 772
 773         /* save all floating registers into the CallContext  */
 774         for (i = 0; i < FP_PARAM_REGS; i++)
 775                 arm_strfpx (code, i, ARMREG_FP, ccontext_offset + MONO_STRUCT_OFFSET (CallContext, fregs) + i * sizeof (double));
 776
 777         /* set the stack pointer to the value at call site */
 778         arm_addx_imm (code, ARMREG_R0, ARMREG_FP, framesize);
 779         arm_strx (code, ARMREG_R0, ARMREG_FP, ccontext_offset + MONO_STRUCT_OFFSET (CallContext, stack));
 780
 781         /* call interp_entry with the ccontext and rmethod as arguments */
 782         arm_addx_imm (code, ARMREG_R0, ARMREG_FP, ccontext_offset);
 783         arm_ldrx (code, ARMREG_R1, MONO_ARCH_RGCTX_REG, MONO_STRUCT_OFFSET (MonoFtnDesc, arg));
 784         arm_ldrx (code, ARMREG_IP0, MONO_ARCH_RGCTX_REG, MONO_STRUCT_OFFSET (MonoFtnDesc, addr));
 785         arm_blrx (code, ARMREG_IP0);
 786
 787         /* load the return values from the context */
 788         for (i = 0; i < PARAM_REGS; i++)
 789                 arm_ldrx (code, i, ARMREG_FP, ccontext_offset + MONO_STRUCT_OFFSET (CallContext, gregs) + i * sizeof (host_mgreg_t));
 790
 791         for (i = 0; i < FP_PARAM_REGS; i++)
 792                 arm_ldrfpx (code, i, ARMREG_FP, ccontext_offset + MONO_STRUCT_OFFSET (CallContext, fregs) + i * sizeof (double));
 793
 794         /* reset stack and return */
 795         arm_ldpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 796         arm_addx_imm (code, ARMREG_SP, ARMREG_SP, framesize);
 797         arm_retx (code, ARMREG_LR);
 798
 799         g_assert (code - start < buf_len);
 800
 801         mono_arch_flush_icache (start, code - start);
 802         MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_EXCEPTION_HANDLING, NULL));
 803
 804         if (info)
 805                 *info = mono_tramp_info_create ("native_to_interp_trampoline", start, code - start, ji, unwind_ops);
 806
 807         return start;
 808 #else
 809         g_assert_not_reached ();
 810         return NULL;
 811 #endif /* DISABLE_INTERPRETER */
 812 }
 813
 814 #else /* DISABLE_JIT */
 815
 816 guchar*
 817 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
 818 {
 819         g_assert_not_reached ();
 820         return NULL;
 821 }
 822
 823 gpointer
 824 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
 825 {
 826         g_assert_not_reached ();
 827         return NULL;
 828 }
 829
 830 gpointer
 831 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
 832 {
 833         g_assert_not_reached ();
 834         return NULL;
 835 }
 836
 837 gpointer
 838 mono_arch_get_static_rgctx_trampoline (gpointer arg, gpointer addr)
 839 {
 840         g_assert_not_reached ();
 841         return NULL;
 842 }
 843
 844 gpointer
 845 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
 846 {
 847         g_assert_not_reached ();
 848         return NULL;
 849 }
 850
 851 gpointer
 852 mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
 853 {
 854         g_assert_not_reached ();
 855         return NULL;
 856 }
 857
 858 guint8*
 859 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
 860 {
 861         g_assert_not_reached ();
 862         return NULL;
 863 }
 864
 865 gpointer
 866 mono_arch_get_interp_to_native_trampoline (MonoTrampInfo **info)
 867 {
 868         g_assert_not_reached ();
 869         return NULL;
 870 }
 871
 872 gpointer
 873 mono_arch_get_native_to_interp_trampoline (MonoTrampInfo **info)
 874 {
 875         g_assert_not_reached ();
 876         return NULL;
 877 }
 878
 879 #endif /* !DISABLE_JIT */