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 #include "mono/utils/mono-tls-inline.h"
  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         const 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, GUINT_TO_POINTER (MONO_JIT_ICALL_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_strp (code, ARMREG_R0, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
 208         /* lmf->previous_lmf = *lmf_addr */
 209         arm_ldrp (code, ARMREG_IP1, ARMREG_R0, 0);
 210         arm_strp (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
 211         /* *lmf_addr = lmf */
 212         arm_strp (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                 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, GINT_TO_POINTER (mono_trampoline_type_to_jit_icall_id (tramp_type)));
 233         } else {
 234                 tramp = (guint8*)mono_get_trampoline_func (tramp_type);
 235                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
 236         }
 237         arm_blrx (code, ARMREG_IP0);
 238
 239         /* Save the result */
 240         arm_strx (code, ARMREG_R0, ARMREG_FP, res_offset);
 241
 242         /* Restore LMF */
 243         /* Similar to emit_restore_lmf () */
 244         /* Clobbers ip0/ip1 */
 245         /* ip0 = lmf */
 246         arm_addx_imm (code, ARMREG_IP0, ARMREG_FP, lmf_offset);
 247         /* ip1 = lmf->previous_lmf */
 248         arm_ldrp (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
 249         /* ip0 = lmf->lmf_addr */
 250         arm_ldrp (code, ARMREG_IP0, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
 251         /* *lmf_addr = previous_lmf */
 252         arm_strp (code, ARMREG_IP1, ARMREG_IP0, 0);
 253
 254         /* Check for thread interruption */
 255         /* This is not perf critical code so no need to check the interrupt flag */
 256         if (aot) {
 257                 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, GUINT_TO_POINTER (MONO_JIT_ICALL_mono_thread_force_interruption_checkpoint_noraise));
 258         } else {
 259                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)mono_thread_force_interruption_checkpoint_noraise);
 260         }
 261         arm_blrx (code, ARMREG_IP0);
 262         /* Check whenever there is an exception to be thrown */
 263         labels [0] = code;
 264         arm_cbnzx (code, ARMREG_R0, 0);
 265
 266         /* Normal case */
 267
 268         /* Restore gregs */
 269         /* Only have to load the argument regs (r0..r8) and the rgctx reg */
 270         code = mono_arm_emit_load_regarray (code, 0x1ff | (1 << ARMREG_LR) | (1 << MONO_ARCH_RGCTX_REG), ARMREG_FP, gregs_offset);
 271         /* Restore fregs */
 272         for (i = 0; i < num_fregs; ++i)
 273                 arm_ldrfpx (code, i, ARMREG_FP, fregs_offset + (i * 8));
 274
 275         /* Load the result */
 276         arm_ldrx (code, ARMREG_IP1, ARMREG_FP, res_offset);
 277
 278         /* These trampolines return a value */
 279         if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
 280                 arm_movx (code, ARMREG_R0, ARMREG_IP1);
 281
 282         /* Cleanup frame */
 283         code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0)));
 284
 285         if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
 286                 arm_retx (code, ARMREG_LR);
 287         else
 288                 arm_brx (code, ARMREG_IP1);
 289
 290         /* Exception case */
 291         mono_arm_patch (labels [0], code, MONO_R_ARM64_CBZ);
 292
 293         /*
 294          * We have an exception we want to throw in the caller's frame, so pop
 295          * the trampoline frame and throw from the caller.
 296          */
 297         code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0)));
 298         /* We are in the parent frame, the exception is in x0 */
 299         /*
 300          * EH is initialized after trampolines, so get the address of the variable
 301          * which contains throw_exception, and load it from there.
 302          */
 303         if (aot) {
 304                 /* Not really a jit icall */
 305                 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, GUINT_TO_POINTER (MONO_JIT_ICALL_mono_rethrow_preserve_exception));
 306         } else {
 307                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)mono_get_rethrow_preserve_exception_addr ());
 308         }
 309         arm_ldrx (code, ARMREG_IP0, ARMREG_IP0, 0);
 310         /* lr contains the return address, the trampoline will use it as the throw site */
 311         arm_brx (code, ARMREG_IP0);
 312
 313         g_assert ((code - buf) < buf_len);
 314         mono_arch_flush_icache (buf, code - buf);
 315         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL));
 316
 317         if (info) {
 318                 tramp_name = mono_get_generic_trampoline_name (tramp_type);
 319                 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
 320         }
 321
 322         return buf;
 323 }
 324
 325 gpointer
 326 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
 327 {
 328         guint8 *code, *buf, *tramp;
 329         int buf_len = 64;
 330
 331         /*
 332          * Return a trampoline which calls generic trampoline TRAMP_TYPE passing in ARG1.
 333          * Pass the argument in ip1, clobbering ip0.
 334          */
 335         tramp = mono_get_trampoline_code (tramp_type);
 336
 337         buf = code = mono_domain_code_reserve (domain, buf_len);
 338
 339         code = mono_arm_emit_imm64 (code, ARMREG_IP1, (guint64)arg1);
 340         code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
 341
 342         arm_brx (code, ARMREG_IP0);
 343
 344         g_assert ((code - buf) < buf_len);
 345         mono_arch_flush_icache (buf, code - buf);
 346         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_SPECIFIC_TRAMPOLINE, mono_get_generic_trampoline_simple_name (tramp_type)));
 347
 348         if (code_len)
 349                 *code_len = code - buf;
 350
 351         return buf;
 352 }
 353
 354 gpointer
 355 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
 356 {
 357         guint8 *code, *start;
 358         guint32 size = 32;
 359         MonoDomain *domain = mono_domain_get ();
 360
 361         start = code = mono_domain_code_reserve (domain, size);
 362         code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
 363         arm_addx_imm (code, ARMREG_R0, ARMREG_R0, MONO_ABI_SIZEOF (MonoObject));
 364         arm_brx (code, ARMREG_IP0);
 365
 366         g_assert ((code - start) <= size);
 367         mono_arch_flush_icache (start, code - start);
 368         MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_UNBOX_TRAMPOLINE, m));
 369         return start;
 370 }
 371
 372 gpointer
 373 mono_arch_get_static_rgctx_trampoline (gpointer arg, gpointer addr)
 374 {
 375         guint8 *code, *start;
 376         guint32 buf_len = 32;
 377         MonoDomain *domain = mono_domain_get ();
 378
 379         start = code = mono_domain_code_reserve (domain, buf_len);
 380         code = mono_arm_emit_imm64 (code, MONO_ARCH_RGCTX_REG, (guint64)arg);
 381         code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
 382         arm_brx (code, ARMREG_IP0);
 383
 384         g_assert ((code - start) <= buf_len);
 385
 386         mono_arch_flush_icache (start, code - start);
 387         MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL));
 388
 389         return start;
 390 }
 391
 392 gpointer
 393 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
 394 {
 395         guint8 *code, *buf;
 396         int buf_size;
 397         int i, depth, index, njumps;
 398         gboolean is_mrgctx;
 399         guint8 **rgctx_null_jumps;
 400         MonoJumpInfo *ji = NULL;
 401         GSList *unwind_ops = NULL;
 402         guint8 *tramp;
 403         guint32 code_len;
 404
 405         is_mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
 406         index = MONO_RGCTX_SLOT_INDEX (slot);
 407         if (is_mrgctx)
 408                 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (target_mgreg_t);
 409         for (depth = 0; ; ++depth) {
 410                 int size = mono_class_rgctx_get_array_size (depth, is_mrgctx);
 411
 412                 if (index < size - 1)
 413                         break;
 414                 index -= size - 1;
 415         }
 416
 417         buf_size = 64 + 16 * depth;
 418         code = buf = mono_global_codeman_reserve (buf_size);
 419
 420         rgctx_null_jumps = g_malloc0 (sizeof (guint8*) * (depth + 2));
 421         njumps = 0;
 422
 423         /* The vtable/mrgtx is in R0 */
 424         g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
 425
 426         if (is_mrgctx) {
 427                 /* get mrgctx ptr */
 428                 arm_movx (code, ARMREG_IP1, ARMREG_R0);
 429         } else {
 430                 /* load rgctx ptr from vtable */
 431                 code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_R0, MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context));
 432                 /* is the rgctx ptr null? */
 433                 /* if yes, jump to actual trampoline */
 434                 rgctx_null_jumps [njumps ++] = code;
 435                 arm_cbzx (code, ARMREG_IP1, 0);
 436         }
 437
 438         for (i = 0; i < depth; ++i) {
 439                 /* load ptr to next array */
 440                 if (is_mrgctx && i == 0) {
 441                         code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT);
 442                 } else {
 443                         code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, 0);
 444                 }
 445                 /* is the ptr null? */
 446                 /* if yes, jump to actual trampoline */
 447                 rgctx_null_jumps [njumps ++] = code;
 448                 arm_cbzx (code, ARMREG_IP1, 0);
 449         }
 450
 451         /* fetch slot */
 452         code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, sizeof (target_mgreg_t) * (index + 1));
 453         /* is the slot null? */
 454         /* if yes, jump to actual trampoline */
 455         rgctx_null_jumps [njumps ++] = code;
 456         arm_cbzx (code, ARMREG_IP1, 0);
 457         /* otherwise return, result is in IP1 */
 458         arm_movx (code, ARMREG_R0, ARMREG_IP1);
 459         arm_brx (code, ARMREG_LR);
 460
 461         g_assert (njumps <= depth + 2);
 462         for (i = 0; i < njumps; ++i)
 463                 mono_arm_patch (rgctx_null_jumps [i], code, MONO_R_ARM64_CBZ);
 464
 465         g_free (rgctx_null_jumps);
 466
 467         /* Slowpath */
 468
 469         /* Call mono_rgctx_lazy_fetch_trampoline (), passing in the slot as argument */
 470         /* The vtable/mrgctx is still in R0 */
 471         if (aot) {
 472                 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_SPECIFIC_TRAMPOLINE_LAZY_FETCH_ADDR, GUINT_TO_POINTER (slot));
 473         } else {
 474                 tramp = (guint8*)mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), &code_len);
 475                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
 476         }
 477         arm_brx (code, ARMREG_IP0);
 478
 479         mono_arch_flush_icache (buf, code - buf);
 480         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL));
 481
 482         g_assert (code - buf <= buf_size);
 483
 484         if (info) {
 485                 char *name = mono_get_rgctx_fetch_trampoline_name (slot);
 486                 *info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);
 487                 g_free (name);
 488         }
 489
 490         return buf;
 491 }
 492
 493 gpointer
 494 mono_arch_create_general_rgctx_lazy_fetch_trampoline (MonoTrampInfo **info, gboolean aot)
 495 {
 496         guint8 *code, *buf;
 497         int tramp_size;
 498         MonoJumpInfo *ji = NULL;
 499         GSList *unwind_ops = NULL;
 500
 501         g_assert (aot);
 502
 503         tramp_size = 32;
 504
 505         code = buf = mono_global_codeman_reserve (tramp_size);
 506
 507         mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, 0);
 508
 509         // FIXME: Currently, we always go to the slow path.
 510         /* Load trampoline addr */
 511         arm_ldrx (code, ARMREG_IP0, MONO_ARCH_RGCTX_REG, 8);
 512         /* The vtable/mrgctx is in R0 */
 513         g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
 514         arm_brx (code, ARMREG_IP0);
 515
 516         mono_arch_flush_icache (buf, code - buf);
 517         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL));
 518
 519         g_assert (code - buf <= tramp_size);
 520
 521         if (info)
 522                 *info = mono_tramp_info_create ("rgctx_fetch_trampoline_general", buf, code - buf, ji, unwind_ops);
 523
 524         return buf;
 525 }
 526
 527 /*
 528  * mono_arch_create_sdb_trampoline:
 529  *
 530  *   Return a trampoline which captures the current context, passes it to
 531  * mini_get_dbg_callbacks ()->single_step_from_context ()/mini_get_dbg_callbacks ()->breakpoint_from_context (),
 532  * then restores the (potentially changed) context.
 533  */
 534 guint8*
 535 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
 536 {
 537         int tramp_size = 512;
 538         int offset, imm, frame_size, ctx_offset;
 539         guint64 gregs_regset;
 540         guint8 *code, *buf;
 541         GSList *unwind_ops = NULL;
 542         MonoJumpInfo *ji = NULL;
 543
 544         code = buf = mono_global_codeman_reserve (tramp_size);
 545
 546         /* Compute stack frame size and offsets */
 547         offset = 0;
 548         /* frame block */
 549         offset += 2 * 8;
 550         /* MonoContext */
 551         ctx_offset = offset;
 552         offset += sizeof (MonoContext);
 553         offset = ALIGN_TO (offset, MONO_ARCH_FRAME_ALIGNMENT);
 554         frame_size = offset;
 555
 556         // FIXME: Unwind info
 557
 558         /* Setup stack frame */
 559         imm = frame_size;
 560         while (imm > 256) {
 561                 arm_subx_imm (code, ARMREG_SP, ARMREG_SP, 256);
 562                 imm -= 256;
 563         }
 564         arm_subx_imm (code, ARMREG_SP, ARMREG_SP, imm);
 565         arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 566         arm_movspx (code, ARMREG_FP, ARMREG_SP);
 567
 568         /* Initialize a MonoContext structure on the stack */
 569         /* No need to save fregs */
 570         gregs_regset = ~((1 << ARMREG_FP) | (1 << ARMREG_SP));
 571         code = mono_arm_emit_store_regarray (code, gregs_regset, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs));
 572         /* Save caller fp */
 573         arm_ldrx (code, ARMREG_IP1, ARMREG_FP, 0);
 574         arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_FP * 8));
 575         /* Save caller sp */
 576         arm_movx (code, ARMREG_IP1, ARMREG_FP);
 577         imm = frame_size;
 578         while (imm > 256) {
 579                 arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, 256);
 580                 imm -= 256;
 581         }
 582         arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, imm);
 583         arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_SP * 8));
 584         /* Save caller ip */
 585         arm_ldrx (code, ARMREG_IP1, ARMREG_FP, 8);
 586         arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, pc));
 587
 588         /* Call the single step/breakpoint function in sdb */
 589         /* Arg1 = ctx */
 590         arm_addx_imm (code, ARMREG_R0, ARMREG_FP, ctx_offset);
 591         if (aot) {
 592                 if (single_step)
 593                         code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, GUINT_TO_POINTER (MONO_JIT_ICALL_mono_debugger_agent_single_step_from_context));
 594                 else
 595                         code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, GUINT_TO_POINTER (MONO_JIT_ICALL_mono_debugger_agent_breakpoint_from_context));
 596         } else {
 597                 void (*addr) (MonoContext *ctx) = single_step ? mini_get_dbg_callbacks ()->single_step_from_context : mini_get_dbg_callbacks ()->breakpoint_from_context;
 598
 599                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
 600         }
 601         arm_blrx (code, ARMREG_IP0);
 602
 603         /* Restore ctx */
 604         /* Save fp/pc into the frame block */
 605         arm_ldrx (code, ARMREG_IP0, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_FP * 8));
 606         arm_strx (code, ARMREG_IP0, ARMREG_FP, 0);
 607         arm_ldrx (code, ARMREG_IP0, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, pc));
 608         arm_strx (code, ARMREG_IP0, ARMREG_FP, 8);
 609         gregs_regset = ~((1 << ARMREG_FP) | (1 << ARMREG_SP));
 610         code = mono_arm_emit_load_regarray (code, gregs_regset, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs));
 611
 612         code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0) | (1 << ARMREG_IP1)));
 613
 614         arm_retx (code, ARMREG_LR);
 615
 616         mono_arch_flush_icache (code, code - buf);
 617         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL));
 618         g_assert (code - buf <= tramp_size);
 619
 620         const char *tramp_name = single_step ? "sdb_single_step_trampoline" : "sdb_breakpoint_trampoline";
 621         *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
 622
 623         return buf;
 624 }
 625
 626 /*
 627  * mono_arch_get_interp_to_native_trampoline:
 628  *
 629  *   See tramp-amd64.c for documentation.
 630  */
 631 gpointer
 632 mono_arch_get_interp_to_native_trampoline (MonoTrampInfo **info)
 633 {
 634 #ifndef DISABLE_INTERPRETER
 635         guint8 *start = NULL, *code;
 636         guint8 *label_start_copy, *label_exit_copy;
 637         MonoJumpInfo *ji = NULL;
 638         GSList *unwind_ops = NULL;
 639         int buf_len, i, framesize = 0, off_methodargs, off_targetaddr;
 640
 641         buf_len = 512 + 1024;
 642         start = code = (guint8 *) mono_global_codeman_reserve (buf_len);
 643
 644         /* allocate frame */
 645         framesize += 2 * sizeof (host_mgreg_t);
 646
 647         off_methodargs = framesize;
 648         framesize += sizeof (host_mgreg_t);
 649
 650         off_targetaddr = framesize;
 651         framesize += sizeof (host_mgreg_t);
 652
 653         framesize = ALIGN_TO (framesize, MONO_ARCH_FRAME_ALIGNMENT);
 654
 655         arm_subx_imm (code, ARMREG_SP, ARMREG_SP, framesize);
 656         arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 657         arm_movspx (code, ARMREG_FP, ARMREG_SP);
 658
 659         /* save CallContext* onto stack */
 660         arm_strx (code, ARMREG_R1, ARMREG_FP, off_methodargs);
 661
 662         /* save target address onto stack */
 663         arm_strx (code, ARMREG_R0, ARMREG_FP, off_targetaddr);
 664
 665         /* allocate the stack space necessary for the call */
 666         arm_ldrw (code, ARMREG_R0, ARMREG_R1, MONO_STRUCT_OFFSET (CallContext, stack_size));
 667         arm_movspx (code, ARMREG_IP0, ARMREG_SP);
 668         arm_subx (code, ARMREG_IP0, ARMREG_IP0, ARMREG_R0);
 669         arm_movspx (code, ARMREG_SP, ARMREG_IP0);
 670
 671         /* copy stack from the CallContext, IP0 = dest, IP1 = source */
 672         arm_movspx (code, ARMREG_IP0, ARMREG_SP);
 673         arm_ldrp (code, ARMREG_IP1, ARMREG_R1, MONO_STRUCT_OFFSET (CallContext, stack));
 674
 675         label_start_copy = code;
 676
 677         arm_cmpx_imm (code, ARMREG_R0, 0);
 678         label_exit_copy = code;
 679         arm_bcc (code, ARMCOND_EQ, 0);
 680         arm_ldrx (code, ARMREG_R2, ARMREG_IP1, 0);
 681         arm_strx (code, ARMREG_R2, ARMREG_IP0, 0);
 682         arm_addx_imm (code, ARMREG_IP0, ARMREG_IP0, sizeof (host_mgreg_t));
 683         arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, sizeof (host_mgreg_t));
 684         arm_subx_imm (code, ARMREG_R0, ARMREG_R0, sizeof (host_mgreg_t));
 685         arm_b (code, label_start_copy);
 686         mono_arm_patch (label_exit_copy, code, MONO_R_ARM64_BCC);
 687
 688         /* Load CallContext* into IP0 */
 689         arm_ldrx (code, ARMREG_IP0, ARMREG_FP, off_methodargs);
 690
 691         /* set all general purpose registers from CallContext */
 692         for (i = 0; i < PARAM_REGS + 1; i++)
 693                 arm_ldrx (code, i, ARMREG_IP0, MONO_STRUCT_OFFSET (CallContext, gregs) + i * sizeof (host_mgreg_t));
 694
 695         /* set all floating registers from CallContext  */
 696         for (i = 0; i < FP_PARAM_REGS; i++)
 697                 arm_ldrfpx (code, i, ARMREG_IP0, MONO_STRUCT_OFFSET (CallContext, fregs) + i * sizeof (double));
 698
 699         /* load target addr */
 700         arm_ldrx (code, ARMREG_IP0, ARMREG_FP, off_targetaddr);
 701
 702         /* call into native function */
 703         arm_blrx (code, ARMREG_IP0);
 704
 705         /* load CallContext* */
 706         arm_ldrx (code, ARMREG_IP0, ARMREG_FP, off_methodargs);
 707
 708         /* set all general purpose registers to CallContext */
 709         for (i = 0; i < PARAM_REGS; i++)
 710                 arm_strx (code, i, ARMREG_IP0, MONO_STRUCT_OFFSET (CallContext, gregs) + i * sizeof (host_mgreg_t));
 711
 712         /* set all floating registers to CallContext  */
 713         for (i = 0; i < FP_PARAM_REGS; i++)
 714                 arm_strfpx (code, i, ARMREG_IP0, MONO_STRUCT_OFFSET (CallContext, fregs) + i * sizeof (double));
 715
 716         arm_movspx (code, ARMREG_SP, ARMREG_FP);
 717         arm_ldpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 718         arm_addx_imm (code, ARMREG_SP, ARMREG_SP, framesize);
 719         arm_retx (code, ARMREG_LR);
 720
 721         g_assert (code - start < buf_len);
 722
 723         mono_arch_flush_icache (start, code - start);
 724         MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_HELPER, NULL));
 725
 726         if (info)
 727                 *info = mono_tramp_info_create ("interp_to_native_trampoline", start, code - start, ji, unwind_ops);
 728
 729         return start;
 730 #else
 731         g_assert_not_reached ();
 732         return NULL;
 733 #endif /* DISABLE_INTERPRETER */
 734 }
 735
 736 gpointer
 737 mono_arch_get_native_to_interp_trampoline (MonoTrampInfo **info)
 738 {
 739 #ifndef DISABLE_INTERPRETER
 740         guint8 *start = NULL, *code;
 741         MonoJumpInfo *ji = NULL;
 742         GSList *unwind_ops = NULL;
 743         int buf_len, i;
 744         int framesize, offset, ccontext_offset;
 745
 746         buf_len = 512;
 747         start = code = (guint8 *) mono_global_codeman_reserve (buf_len);
 748
 749         /* Allocate frame (FP + LR + CallContext) */
 750         offset = 2 * sizeof (host_mgreg_t);
 751         ccontext_offset = offset;
 752         offset += sizeof (CallContext);
 753         framesize = ALIGN_TO (offset, MONO_ARCH_FRAME_ALIGNMENT);
 754
 755         mono_add_unwind_op_def_cfa (unwind_ops, code, start, ARMREG_SP, 0);
 756
 757         arm_subx_imm (code, ARMREG_SP, ARMREG_SP, framesize);
 758         mono_add_unwind_op_def_cfa_offset (unwind_ops, code, start, framesize);
 759
 760         arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 761         mono_add_unwind_op_offset (unwind_ops, code, start, ARMREG_LR, -framesize + 8);
 762         mono_add_unwind_op_offset (unwind_ops, code, start, ARMREG_FP, -framesize);
 763
 764         arm_movspx (code, ARMREG_FP, ARMREG_SP);
 765         mono_add_unwind_op_def_cfa_reg (unwind_ops, code, start, ARMREG_FP);
 766
 767         /* save all general purpose registers into the CallContext */
 768         for (i = 0; i < PARAM_REGS + 1; i++)
 769                 arm_strx (code, i, ARMREG_FP, ccontext_offset + MONO_STRUCT_OFFSET (CallContext, gregs) + i * sizeof (host_mgreg_t));
 770
 771         /* save all floating registers into the CallContext  */
 772         for (i = 0; i < FP_PARAM_REGS; i++)
 773                 arm_strfpx (code, i, ARMREG_FP, ccontext_offset + MONO_STRUCT_OFFSET (CallContext, fregs) + i * sizeof (double));
 774
 775         /* set the stack pointer to the value at call site */
 776         arm_addx_imm (code, ARMREG_R0, ARMREG_FP, framesize);
 777         arm_strp (code, ARMREG_R0, ARMREG_FP, ccontext_offset + MONO_STRUCT_OFFSET (CallContext, stack));
 778
 779         /* call interp_entry with the ccontext and rmethod as arguments */
 780         arm_addx_imm (code, ARMREG_R0, ARMREG_FP, ccontext_offset);
 781         arm_ldrp (code, ARMREG_R1, MONO_ARCH_RGCTX_REG, MONO_STRUCT_OFFSET (MonoFtnDesc, arg));
 782         arm_ldrp (code, ARMREG_IP0, MONO_ARCH_RGCTX_REG, MONO_STRUCT_OFFSET (MonoFtnDesc, addr));
 783         arm_blrx (code, ARMREG_IP0);
 784
 785         /* load the return values from the context */
 786         for (i = 0; i < PARAM_REGS; i++)
 787                 arm_ldrx (code, i, ARMREG_FP, ccontext_offset + MONO_STRUCT_OFFSET (CallContext, gregs) + i * sizeof (host_mgreg_t));
 788
 789         for (i = 0; i < FP_PARAM_REGS; i++)
 790                 arm_ldrfpx (code, i, ARMREG_FP, ccontext_offset + MONO_STRUCT_OFFSET (CallContext, fregs) + i * sizeof (double));
 791
 792         /* reset stack and return */
 793         arm_ldpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 794         arm_addx_imm (code, ARMREG_SP, ARMREG_SP, framesize);
 795         arm_retx (code, ARMREG_LR);
 796
 797         g_assert (code - start < buf_len);
 798
 799         mono_arch_flush_icache (start, code - start);
 800         MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_EXCEPTION_HANDLING, NULL));
 801
 802         if (info)
 803                 *info = mono_tramp_info_create ("native_to_interp_trampoline", start, code - start, ji, unwind_ops);
 804
 805         return start;
 806 #else
 807         g_assert_not_reached ();
 808         return NULL;
 809 #endif /* DISABLE_INTERPRETER */
 810 }
 811
 812 #else /* DISABLE_JIT */
 813
 814 guchar*
 815 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
 816 {
 817         g_assert_not_reached ();
 818         return NULL;
 819 }
 820
 821 gpointer
 822 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
 823 {
 824         g_assert_not_reached ();
 825         return NULL;
 826 }
 827
 828 gpointer
 829 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
 830 {
 831         g_assert_not_reached ();
 832         return NULL;
 833 }
 834
 835 gpointer
 836 mono_arch_get_static_rgctx_trampoline (gpointer arg, gpointer addr)
 837 {
 838         g_assert_not_reached ();
 839         return NULL;
 840 }
 841
 842 gpointer
 843 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
 844 {
 845         g_assert_not_reached ();
 846         return NULL;
 847 }
 848
 849 gpointer
 850 mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
 851 {
 852         g_assert_not_reached ();
 853         return NULL;
 854 }
 855
 856 guint8*
 857 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
 858 {
 859         g_assert_not_reached ();
 860         return NULL;
 861 }
 862
 863 gpointer
 864 mono_arch_get_interp_to_native_trampoline (MonoTrampInfo **info)
 865 {
 866         g_assert_not_reached ();
 867         return NULL;
 868 }
 869
 870 gpointer
 871 mono_arch_get_native_to_interp_trampoline (MonoTrampInfo **info)
 872 {
 873         g_assert_not_reached ();
 874         return NULL;
 875 }
 876
 877 #endif /* !DISABLE_JIT */