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         code -= 4;
  76         guint32 ins = *(guint32 *)code;
  77         /* Should be a b/bl */
  78         if (((ins >> 26) & 0x1f) != 0x5)
  79                 return NULL;
  80         gint32 disp = ((gint32)((ins & 0x3ffffff) << 6)) >> 6;
  81         return code + (disp * 4);
  82 }
  83
  84 guint32
  85 mono_arch_get_plt_info_offset (guint8 *plt_entry, host_mgreg_t *regs, guint8 *code)
  86 {
  87         /* The offset is stored as the 5th word of the plt entry */
  88         return ((guint32*)plt_entry) [4];
  89 }
  90
  91 #ifndef DISABLE_JIT
  92
  93 guchar*
  94 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
  95 {
  96         guint8 *code, *buf, *tramp, *labels [16];
  97         int i, buf_len, imm;
  98         int frame_size, offset, gregs_offset, num_fregs, fregs_offset, arg_offset, lmf_offset, res_offset;
  99         guint64 gregs_regset;
 100         GSList *unwind_ops = NULL;
 101         MonoJumpInfo *ji = NULL;
 102         const char *tramp_name;
 103
 104         buf_len = 768;
 105         buf = code = mono_global_codeman_reserve (buf_len);
 106
 107         /*
 108          * We are getting called by a specific trampoline, ip1 contains the trampoline argument.
 109          */
 110
 111         /* Compute stack frame size and offsets */
 112         offset = 0;
 113         /* frame block */
 114         offset += 2 * 8;
 115         /* gregs */
 116         gregs_offset = offset;
 117         offset += 32 * 8;
 118         /* fregs */
 119         // FIXME: Save 128 bits
 120         /* Only have to save the argument regs */
 121         num_fregs = 8;
 122         fregs_offset = offset;
 123         offset += num_fregs * 8;
 124         /* arg */
 125         arg_offset = offset;
 126         offset += 8;
 127         /* result */
 128         res_offset = offset;
 129         offset += 8;
 130         /* LMF */
 131         lmf_offset = offset;
 132         offset += sizeof (MonoLMF);
 133         //offset += 22 * 8;
 134         frame_size = ALIGN_TO (offset, MONO_ARCH_FRAME_ALIGNMENT);
 135
 136         /* Setup stack frame */
 137         imm = frame_size;
 138         mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, 0);
 139         while (imm > 256) {
 140                 arm_subx_imm (code, ARMREG_SP, ARMREG_SP, 256);
 141                 imm -= 256;
 142                 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, frame_size - imm);
 143         }
 144         arm_subx_imm (code, ARMREG_SP, ARMREG_SP, imm);
 145         mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, frame_size);
 146
 147         arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 148         mono_add_unwind_op_offset (unwind_ops, code, buf, ARMREG_LR, -frame_size + 8);
 149         mono_add_unwind_op_offset (unwind_ops, code, buf, ARMREG_FP, -frame_size);
 150
 151         arm_movspx (code, ARMREG_FP, ARMREG_SP);
 152         mono_add_unwind_op_def_cfa_reg (unwind_ops, code, buf, ARMREG_FP);
 153
 154         /* Save gregs */
 155         // FIXME: Optimize this
 156         gregs_regset = ~((1 << ARMREG_FP) | (1 << ARMREG_SP));
 157         code = mono_arm_emit_store_regarray (code, gregs_regset, ARMREG_FP, gregs_offset);
 158         /* Save fregs */
 159         for (i = 0; i < num_fregs; ++i)
 160                 arm_strfpx (code, i, ARMREG_FP, fregs_offset + (i * 8));
 161         /* Save trampoline arg */
 162         arm_strx (code, ARMREG_IP1, ARMREG_FP, arg_offset);
 163
 164         /* Setup LMF */
 165         arm_addx_imm (code, ARMREG_IP0, ARMREG_FP, lmf_offset);
 166         code = mono_arm_emit_store_regset (code, MONO_ARCH_LMF_REGS, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, gregs));
 167         /* Save caller fp */
 168         arm_ldrx (code, ARMREG_IP1, ARMREG_FP, 0);
 169         arm_strx (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, gregs) + (MONO_ARCH_LMF_REG_FP * 8));
 170         /* Save caller sp */
 171         arm_movx (code, ARMREG_IP1, ARMREG_FP);
 172         imm = frame_size;
 173         while (imm > 256) {
 174                 arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, 256);
 175                 imm -= 256;
 176         }
 177         arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, imm);
 178         arm_strx (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, gregs) + (MONO_ARCH_LMF_REG_SP * 8));
 179         /* Save caller pc */
 180         if (tramp_type == MONO_TRAMPOLINE_JUMP)
 181                 arm_movx (code, ARMREG_LR, ARMREG_RZR);
 182         else
 183                 arm_ldrx (code, ARMREG_LR, ARMREG_FP, 8);
 184         arm_strx (code, ARMREG_LR, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, pc));
 185
 186         /* Save LMF */
 187         /* Similar to emit_save_lmf () */
 188         if (aot) {
 189                 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));
 190         } else {
 191                 tramp = (guint8*)mono_get_lmf_addr;
 192                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
 193         }
 194         arm_blrx (code, ARMREG_IP0);
 195         /* r0 contains the address of the tls slot holding the current lmf */
 196         /* ip0 = lmf */
 197         arm_addx_imm (code, ARMREG_IP0, ARMREG_FP, lmf_offset);
 198         /* lmf->lmf_addr = lmf_addr */
 199         arm_strp (code, ARMREG_R0, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
 200         /* lmf->previous_lmf = *lmf_addr */
 201         arm_ldrp (code, ARMREG_IP1, ARMREG_R0, 0);
 202         arm_strp (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
 203         /* *lmf_addr = lmf */
 204         arm_strp (code, ARMREG_IP0, ARMREG_R0, 0);
 205
 206         /* Call the C trampoline function */
 207         /* Arg 1 = gregs */
 208         arm_addx_imm (code, ARMREG_R0, ARMREG_FP, gregs_offset);
 209         /* Arg 2 = caller */
 210         if (tramp_type == MONO_TRAMPOLINE_JUMP)
 211                 arm_movx (code, ARMREG_R1, ARMREG_RZR);
 212         else
 213                 arm_ldrx (code, ARMREG_R1, ARMREG_FP, gregs_offset + (ARMREG_LR * 8));
 214         /* Arg 3 = arg */
 215         if (MONO_TRAMPOLINE_TYPE_HAS_ARG (tramp_type))
 216                 /* Passed in r0 */
 217                 arm_ldrx (code, ARMREG_R2, ARMREG_FP, gregs_offset + (ARMREG_R0 * 8));
 218         else
 219                 arm_ldrx (code, ARMREG_R2, ARMREG_FP, arg_offset);
 220         /* Arg 4 = trampoline addr */
 221         arm_movx (code, ARMREG_R3, ARMREG_RZR);
 222
 223         if (aot) {
 224                 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)));
 225         } else {
 226                 tramp = (guint8*)mono_get_trampoline_func (tramp_type);
 227                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
 228         }
 229         arm_blrx (code, ARMREG_IP0);
 230
 231         /* Save the result */
 232         arm_strx (code, ARMREG_R0, ARMREG_FP, res_offset);
 233
 234         /* Restore LMF */
 235         /* Similar to emit_restore_lmf () */
 236         /* Clobbers ip0/ip1 */
 237         /* ip0 = lmf */
 238         arm_addx_imm (code, ARMREG_IP0, ARMREG_FP, lmf_offset);
 239         /* ip1 = lmf->previous_lmf */
 240         arm_ldrp (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
 241         /* ip0 = lmf->lmf_addr */
 242         arm_ldrp (code, ARMREG_IP0, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
 243         /* *lmf_addr = previous_lmf */
 244         arm_strp (code, ARMREG_IP1, ARMREG_IP0, 0);
 245
 246         /* Check for thread interruption */
 247         /* This is not perf critical code so no need to check the interrupt flag */
 248         if (aot) {
 249                 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));
 250         } else {
 251                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)mono_thread_force_interruption_checkpoint_noraise);
 252         }
 253         arm_blrx (code, ARMREG_IP0);
 254         /* Check whenever there is an exception to be thrown */
 255         labels [0] = code;
 256         arm_cbnzx (code, ARMREG_R0, 0);
 257
 258         /* Normal case */
 259
 260         /* Restore gregs */
 261         /* Only have to load the argument regs (r0..r8) and the rgctx reg */
 262         code = mono_arm_emit_load_regarray (code, 0x1ff | (1 << ARMREG_LR) | (1 << MONO_ARCH_RGCTX_REG), ARMREG_FP, gregs_offset);
 263         /* Restore fregs */
 264         for (i = 0; i < num_fregs; ++i)
 265                 arm_ldrfpx (code, i, ARMREG_FP, fregs_offset + (i * 8));
 266
 267         /* Load the result */
 268         arm_ldrx (code, ARMREG_IP1, ARMREG_FP, res_offset);
 269
 270         /* These trampolines return a value */
 271         if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
 272                 arm_movx (code, ARMREG_R0, ARMREG_IP1);
 273
 274         /* Cleanup frame */
 275         code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0)));
 276
 277         if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
 278                 arm_retx (code, ARMREG_LR);
 279         else
 280                 arm_brx (code, ARMREG_IP1);
 281
 282         /* Exception case */
 283         mono_arm_patch (labels [0], code, MONO_R_ARM64_CBZ);
 284
 285         /*
 286          * We have an exception we want to throw in the caller's frame, so pop
 287          * the trampoline frame and throw from the caller.
 288          */
 289         code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0)));
 290         /* We are in the parent frame, the exception is in x0 */
 291         /*
 292          * EH is initialized after trampolines, so get the address of the variable
 293          * which contains throw_exception, and load it from there.
 294          */
 295         if (aot) {
 296                 /* Not really a jit icall */
 297                 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));
 298         } else {
 299                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)mono_get_rethrow_preserve_exception_addr ());
 300         }
 301         arm_ldrx (code, ARMREG_IP0, ARMREG_IP0, 0);
 302         /* lr contains the return address, the trampoline will use it as the throw site */
 303         arm_brx (code, ARMREG_IP0);
 304
 305         g_assert ((code - buf) < buf_len);
 306         mono_arch_flush_icache (buf, code - buf);
 307         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL));
 308
 309         if (info) {
 310                 tramp_name = mono_get_generic_trampoline_name (tramp_type);
 311                 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
 312         }
 313
 314         return buf;
 315 }
 316
 317 gpointer
 318 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
 319 {
 320         guint8 *code, *buf, *tramp;
 321         int buf_len = 64;
 322
 323         /*
 324          * Return a trampoline which calls generic trampoline TRAMP_TYPE passing in ARG1.
 325          * Pass the argument in ip1, clobbering ip0.
 326          */
 327         tramp = mono_get_trampoline_code (tramp_type);
 328
 329         buf = code = mono_domain_code_reserve (domain, buf_len);
 330
 331         code = mono_arm_emit_imm64 (code, ARMREG_IP1, (guint64)arg1);
 332         code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
 333
 334         arm_brx (code, ARMREG_IP0);
 335
 336         g_assert ((code - buf) < buf_len);
 337         mono_arch_flush_icache (buf, code - buf);
 338         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_SPECIFIC_TRAMPOLINE, mono_get_generic_trampoline_simple_name (tramp_type)));
 339
 340         if (code_len)
 341                 *code_len = code - buf;
 342
 343         return buf;
 344 }
 345
 346 gpointer
 347 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
 348 {
 349         guint8 *code, *start;
 350         guint32 size = 32;
 351         MonoDomain *domain = mono_domain_get ();
 352
 353         start = code = mono_domain_code_reserve (domain, size);
 354         code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
 355         arm_addx_imm (code, ARMREG_R0, ARMREG_R0, MONO_ABI_SIZEOF (MonoObject));
 356         arm_brx (code, ARMREG_IP0);
 357
 358         g_assert ((code - start) <= size);
 359         mono_arch_flush_icache (start, code - start);
 360         MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_UNBOX_TRAMPOLINE, m));
 361         return start;
 362 }
 363
 364 gpointer
 365 mono_arch_get_static_rgctx_trampoline (gpointer arg, gpointer addr)
 366 {
 367         guint8 *code, *start;
 368         guint32 buf_len = 32;
 369         MonoDomain *domain = mono_domain_get ();
 370
 371         start = code = mono_domain_code_reserve (domain, buf_len);
 372         code = mono_arm_emit_imm64 (code, MONO_ARCH_RGCTX_REG, (guint64)arg);
 373         code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
 374         arm_brx (code, ARMREG_IP0);
 375
 376         g_assert ((code - start) <= buf_len);
 377
 378         mono_arch_flush_icache (start, code - start);
 379         MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL));
 380
 381         return start;
 382 }
 383
 384 gpointer
 385 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
 386 {
 387         guint8 *code, *buf;
 388         int buf_size;
 389         int i, depth, index, njumps;
 390         gboolean is_mrgctx;
 391         guint8 **rgctx_null_jumps;
 392         MonoJumpInfo *ji = NULL;
 393         GSList *unwind_ops = NULL;
 394         guint8 *tramp;
 395         guint32 code_len;
 396
 397         is_mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
 398         index = MONO_RGCTX_SLOT_INDEX (slot);
 399         if (is_mrgctx)
 400                 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (target_mgreg_t);
 401         for (depth = 0; ; ++depth) {
 402                 int size = mono_class_rgctx_get_array_size (depth, is_mrgctx);
 403
 404                 if (index < size - 1)
 405                         break;
 406                 index -= size - 1;
 407         }
 408
 409         buf_size = 64 + 16 * depth;
 410         code = buf = mono_global_codeman_reserve (buf_size);
 411
 412         rgctx_null_jumps = g_malloc0 (sizeof (guint8*) * (depth + 2));
 413         njumps = 0;
 414
 415         /* The vtable/mrgtx is in R0 */
 416         g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
 417
 418         if (is_mrgctx) {
 419                 /* get mrgctx ptr */
 420                 arm_movx (code, ARMREG_IP1, ARMREG_R0);
 421         } else {
 422                 /* load rgctx ptr from vtable */
 423                 code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_R0, MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context));
 424                 /* is the rgctx ptr null? */
 425                 /* if yes, jump to actual trampoline */
 426                 rgctx_null_jumps [njumps ++] = code;
 427                 arm_cbzx (code, ARMREG_IP1, 0);
 428         }
 429
 430         for (i = 0; i < depth; ++i) {
 431                 /* load ptr to next array */
 432                 if (is_mrgctx && i == 0) {
 433                         code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT);
 434                 } else {
 435                         code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, 0);
 436                 }
 437                 /* is the ptr null? */
 438                 /* if yes, jump to actual trampoline */
 439                 rgctx_null_jumps [njumps ++] = code;
 440                 arm_cbzx (code, ARMREG_IP1, 0);
 441         }
 442
 443         /* fetch slot */
 444         code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, sizeof (target_mgreg_t) * (index + 1));
 445         /* is the slot null? */
 446         /* if yes, jump to actual trampoline */
 447         rgctx_null_jumps [njumps ++] = code;
 448         arm_cbzx (code, ARMREG_IP1, 0);
 449         /* otherwise return, result is in IP1 */
 450         arm_movx (code, ARMREG_R0, ARMREG_IP1);
 451         arm_brx (code, ARMREG_LR);
 452
 453         g_assert (njumps <= depth + 2);
 454         for (i = 0; i < njumps; ++i)
 455                 mono_arm_patch (rgctx_null_jumps [i], code, MONO_R_ARM64_CBZ);
 456
 457         g_free (rgctx_null_jumps);
 458
 459         /* Slowpath */
 460
 461         /* Call mono_rgctx_lazy_fetch_trampoline (), passing in the slot as argument */
 462         /* The vtable/mrgctx is still in R0 */
 463         if (aot) {
 464                 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_SPECIFIC_TRAMPOLINE_LAZY_FETCH_ADDR, GUINT_TO_POINTER (slot));
 465         } else {
 466                 tramp = (guint8*)mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), &code_len);
 467                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
 468         }
 469         arm_brx (code, ARMREG_IP0);
 470
 471         mono_arch_flush_icache (buf, code - buf);
 472         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL));
 473
 474         g_assert (code - buf <= buf_size);
 475
 476         if (info) {
 477                 char *name = mono_get_rgctx_fetch_trampoline_name (slot);
 478                 *info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);
 479                 g_free (name);
 480         }
 481
 482         return buf;
 483 }
 484
 485 gpointer
 486 mono_arch_create_general_rgctx_lazy_fetch_trampoline (MonoTrampInfo **info, gboolean aot)
 487 {
 488         guint8 *code, *buf;
 489         int tramp_size;
 490         MonoJumpInfo *ji = NULL;
 491         GSList *unwind_ops = NULL;
 492
 493         g_assert (aot);
 494
 495         tramp_size = 32;
 496
 497         code = buf = mono_global_codeman_reserve (tramp_size);
 498
 499         mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, 0);
 500
 501         // FIXME: Currently, we always go to the slow path.
 502         /* Load trampoline addr */
 503         arm_ldrx (code, ARMREG_IP0, MONO_ARCH_RGCTX_REG, 8);
 504         /* The vtable/mrgctx is in R0 */
 505         g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
 506         arm_brx (code, ARMREG_IP0);
 507
 508         mono_arch_flush_icache (buf, code - buf);
 509         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL));
 510
 511         g_assert (code - buf <= tramp_size);
 512
 513         if (info)
 514                 *info = mono_tramp_info_create ("rgctx_fetch_trampoline_general", buf, code - buf, ji, unwind_ops);
 515
 516         return buf;
 517 }
 518
 519 /*
 520  * mono_arch_create_sdb_trampoline:
 521  *
 522  *   Return a trampoline which captures the current context, passes it to
 523  * mini_get_dbg_callbacks ()->single_step_from_context ()/mini_get_dbg_callbacks ()->breakpoint_from_context (),
 524  * then restores the (potentially changed) context.
 525  */
 526 guint8*
 527 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
 528 {
 529         int tramp_size = 512;
 530         int offset, imm, frame_size, ctx_offset;
 531         guint64 gregs_regset;
 532         guint8 *code, *buf;
 533         GSList *unwind_ops = NULL;
 534         MonoJumpInfo *ji = NULL;
 535
 536         code = buf = mono_global_codeman_reserve (tramp_size);
 537
 538         /* Compute stack frame size and offsets */
 539         offset = 0;
 540         /* frame block */
 541         offset += 2 * 8;
 542         /* MonoContext */
 543         ctx_offset = offset;
 544         offset += sizeof (MonoContext);
 545         offset = ALIGN_TO (offset, MONO_ARCH_FRAME_ALIGNMENT);
 546         frame_size = offset;
 547
 548         // FIXME: Unwind info
 549
 550         /* Setup stack frame */
 551         imm = frame_size;
 552         while (imm > 256) {
 553                 arm_subx_imm (code, ARMREG_SP, ARMREG_SP, 256);
 554                 imm -= 256;
 555         }
 556         arm_subx_imm (code, ARMREG_SP, ARMREG_SP, imm);
 557         arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 558         arm_movspx (code, ARMREG_FP, ARMREG_SP);
 559
 560         /* Initialize a MonoContext structure on the stack */
 561         /* No need to save fregs */
 562         gregs_regset = ~((1 << ARMREG_FP) | (1 << ARMREG_SP));
 563         code = mono_arm_emit_store_regarray (code, gregs_regset, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs));
 564         /* Save caller fp */
 565         arm_ldrx (code, ARMREG_IP1, ARMREG_FP, 0);
 566         arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_FP * 8));
 567         /* Save caller sp */
 568         arm_movx (code, ARMREG_IP1, ARMREG_FP);
 569         imm = frame_size;
 570         while (imm > 256) {
 571                 arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, 256);
 572                 imm -= 256;
 573         }
 574         arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, imm);
 575         arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_SP * 8));
 576         /* Save caller ip */
 577         arm_ldrx (code, ARMREG_IP1, ARMREG_FP, 8);
 578         arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, pc));
 579
 580         /* Call the single step/breakpoint function in sdb */
 581         /* Arg1 = ctx */
 582         arm_addx_imm (code, ARMREG_R0, ARMREG_FP, ctx_offset);
 583         if (aot) {
 584                 if (single_step)
 585                         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));
 586                 else
 587                         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));
 588         } else {
 589                 void (*addr) (MonoContext *ctx) = single_step ? mini_get_dbg_callbacks ()->single_step_from_context : mini_get_dbg_callbacks ()->breakpoint_from_context;
 590
 591                 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
 592         }
 593         arm_blrx (code, ARMREG_IP0);
 594
 595         /* Restore ctx */
 596         /* Save fp/pc into the frame block */
 597         arm_ldrx (code, ARMREG_IP0, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_FP * 8));
 598         arm_strx (code, ARMREG_IP0, ARMREG_FP, 0);
 599         arm_ldrx (code, ARMREG_IP0, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, pc));
 600         arm_strx (code, ARMREG_IP0, ARMREG_FP, 8);
 601         gregs_regset = ~((1 << ARMREG_FP) | (1 << ARMREG_SP));
 602         code = mono_arm_emit_load_regarray (code, gregs_regset, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs));
 603
 604         code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0) | (1 << ARMREG_IP1)));
 605
 606         arm_retx (code, ARMREG_LR);
 607
 608         mono_arch_flush_icache (code, code - buf);
 609         MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL));
 610         g_assert (code - buf <= tramp_size);
 611
 612         const char *tramp_name = single_step ? "sdb_single_step_trampoline" : "sdb_breakpoint_trampoline";
 613         *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
 614
 615         return buf;
 616 }
 617
 618 /*
 619  * mono_arch_get_interp_to_native_trampoline:
 620  *
 621  *   See tramp-amd64.c for documentation.
 622  */
 623 gpointer
 624 mono_arch_get_interp_to_native_trampoline (MonoTrampInfo **info)
 625 {
 626 #ifndef DISABLE_INTERPRETER
 627         guint8 *start = NULL, *code;
 628         guint8 *label_start_copy, *label_exit_copy;
 629         MonoJumpInfo *ji = NULL;
 630         GSList *unwind_ops = NULL;
 631         int buf_len, i, framesize = 0, off_methodargs, off_targetaddr;
 632
 633         buf_len = 512 + 1024;
 634         start = code = (guint8 *) mono_global_codeman_reserve (buf_len);
 635
 636         /* allocate frame */
 637         framesize += 2 * sizeof (host_mgreg_t);
 638
 639         off_methodargs = framesize;
 640         framesize += sizeof (host_mgreg_t);
 641
 642         off_targetaddr = framesize;
 643         framesize += sizeof (host_mgreg_t);
 644
 645         framesize = ALIGN_TO (framesize, MONO_ARCH_FRAME_ALIGNMENT);
 646
 647         arm_subx_imm (code, ARMREG_SP, ARMREG_SP, framesize);
 648         arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 649         arm_movspx (code, ARMREG_FP, ARMREG_SP);
 650
 651         /* save CallContext* onto stack */
 652         arm_strx (code, ARMREG_R1, ARMREG_FP, off_methodargs);
 653
 654         /* save target address onto stack */
 655         arm_strx (code, ARMREG_R0, ARMREG_FP, off_targetaddr);
 656
 657         /* allocate the stack space necessary for the call */
 658         arm_ldrw (code, ARMREG_R0, ARMREG_R1, MONO_STRUCT_OFFSET (CallContext, stack_size));
 659         arm_movspx (code, ARMREG_IP0, ARMREG_SP);
 660         arm_subx (code, ARMREG_IP0, ARMREG_IP0, ARMREG_R0);
 661         arm_movspx (code, ARMREG_SP, ARMREG_IP0);
 662
 663         /* copy stack from the CallContext, IP0 = dest, IP1 = source */
 664         arm_movspx (code, ARMREG_IP0, ARMREG_SP);
 665         arm_ldrp (code, ARMREG_IP1, ARMREG_R1, MONO_STRUCT_OFFSET (CallContext, stack));
 666
 667         label_start_copy = code;
 668
 669         arm_cmpx_imm (code, ARMREG_R0, 0);
 670         label_exit_copy = code;
 671         arm_bcc (code, ARMCOND_EQ, 0);
 672         arm_ldrx (code, ARMREG_R2, ARMREG_IP1, 0);
 673         arm_strx (code, ARMREG_R2, ARMREG_IP0, 0);
 674         arm_addx_imm (code, ARMREG_IP0, ARMREG_IP0, sizeof (host_mgreg_t));
 675         arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, sizeof (host_mgreg_t));
 676         arm_subx_imm (code, ARMREG_R0, ARMREG_R0, sizeof (host_mgreg_t));
 677         arm_b (code, label_start_copy);
 678         mono_arm_patch (label_exit_copy, code, MONO_R_ARM64_BCC);
 679
 680         /* Load CallContext* into IP0 */
 681         arm_ldrx (code, ARMREG_IP0, ARMREG_FP, off_methodargs);
 682
 683         /* set all general purpose registers from CallContext */
 684         for (i = 0; i < PARAM_REGS + 1; i++)
 685                 arm_ldrx (code, i, ARMREG_IP0, MONO_STRUCT_OFFSET (CallContext, gregs) + i * sizeof (host_mgreg_t));
 686
 687         /* set all floating registers from CallContext  */
 688         for (i = 0; i < FP_PARAM_REGS; i++)
 689                 arm_ldrfpx (code, i, ARMREG_IP0, MONO_STRUCT_OFFSET (CallContext, fregs) + i * sizeof (double));
 690
 691         /* load target addr */
 692         arm_ldrx (code, ARMREG_IP0, ARMREG_FP, off_targetaddr);
 693
 694         /* call into native function */
 695         arm_blrx (code, ARMREG_IP0);
 696
 697         /* load CallContext* */
 698         arm_ldrx (code, ARMREG_IP0, ARMREG_FP, off_methodargs);
 699
 700         /* set all general purpose registers to CallContext */
 701         for (i = 0; i < PARAM_REGS; i++)
 702                 arm_strx (code, i, ARMREG_IP0, MONO_STRUCT_OFFSET (CallContext, gregs) + i * sizeof (host_mgreg_t));
 703
 704         /* set all floating registers to CallContext  */
 705         for (i = 0; i < FP_PARAM_REGS; i++)
 706                 arm_strfpx (code, i, ARMREG_IP0, MONO_STRUCT_OFFSET (CallContext, fregs) + i * sizeof (double));
 707
 708         arm_movspx (code, ARMREG_SP, ARMREG_FP);
 709         arm_ldpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 710         arm_addx_imm (code, ARMREG_SP, ARMREG_SP, framesize);
 711         arm_retx (code, ARMREG_LR);
 712
 713         g_assert (code - start < buf_len);
 714
 715         mono_arch_flush_icache (start, code - start);
 716         MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_HELPER, NULL));
 717
 718         if (info)
 719                 *info = mono_tramp_info_create ("interp_to_native_trampoline", start, code - start, ji, unwind_ops);
 720
 721         return start;
 722 #else
 723         g_assert_not_reached ();
 724         return NULL;
 725 #endif /* DISABLE_INTERPRETER */
 726 }
 727
 728 gpointer
 729 mono_arch_get_native_to_interp_trampoline (MonoTrampInfo **info)
 730 {
 731 #ifndef DISABLE_INTERPRETER
 732         guint8 *start = NULL, *code;
 733         MonoJumpInfo *ji = NULL;
 734         GSList *unwind_ops = NULL;
 735         int buf_len, i;
 736         int framesize, offset, ccontext_offset;
 737
 738         buf_len = 512;
 739         start = code = (guint8 *) mono_global_codeman_reserve (buf_len);
 740
 741         /* Allocate frame (FP + LR + CallContext) */
 742         offset = 2 * sizeof (host_mgreg_t);
 743         ccontext_offset = offset;
 744         offset += sizeof (CallContext);
 745         framesize = ALIGN_TO (offset, MONO_ARCH_FRAME_ALIGNMENT);
 746
 747         mono_add_unwind_op_def_cfa (unwind_ops, code, start, ARMREG_SP, 0);
 748
 749         arm_subx_imm (code, ARMREG_SP, ARMREG_SP, framesize);
 750         mono_add_unwind_op_def_cfa_offset (unwind_ops, code, start, framesize);
 751
 752         arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 753         mono_add_unwind_op_offset (unwind_ops, code, start, ARMREG_LR, -framesize + 8);
 754         mono_add_unwind_op_offset (unwind_ops, code, start, ARMREG_FP, -framesize);
 755
 756         arm_movspx (code, ARMREG_FP, ARMREG_SP);
 757         mono_add_unwind_op_def_cfa_reg (unwind_ops, code, start, ARMREG_FP);
 758
 759         /* save all general purpose registers into the CallContext */
 760         for (i = 0; i < PARAM_REGS + 1; i++)
 761                 arm_strx (code, i, ARMREG_FP, ccontext_offset + MONO_STRUCT_OFFSET (CallContext, gregs) + i * sizeof (host_mgreg_t));
 762
 763         /* save all floating registers into the CallContext  */
 764         for (i = 0; i < FP_PARAM_REGS; i++)
 765                 arm_strfpx (code, i, ARMREG_FP, ccontext_offset + MONO_STRUCT_OFFSET (CallContext, fregs) + i * sizeof (double));
 766
 767         /* set the stack pointer to the value at call site */
 768         arm_addx_imm (code, ARMREG_R0, ARMREG_FP, framesize);
 769         arm_strp (code, ARMREG_R0, ARMREG_FP, ccontext_offset + MONO_STRUCT_OFFSET (CallContext, stack));
 770
 771         /* call interp_entry with the ccontext and rmethod as arguments */
 772         arm_addx_imm (code, ARMREG_R0, ARMREG_FP, ccontext_offset);
 773         arm_ldrp (code, ARMREG_R1, MONO_ARCH_RGCTX_REG, MONO_STRUCT_OFFSET (MonoFtnDesc, arg));
 774         arm_ldrp (code, ARMREG_IP0, MONO_ARCH_RGCTX_REG, MONO_STRUCT_OFFSET (MonoFtnDesc, addr));
 775         arm_blrx (code, ARMREG_IP0);
 776
 777         /* load the return values from the context */
 778         for (i = 0; i < PARAM_REGS; i++)
 779                 arm_ldrx (code, i, ARMREG_FP, ccontext_offset + MONO_STRUCT_OFFSET (CallContext, gregs) + i * sizeof (host_mgreg_t));
 780
 781         for (i = 0; i < FP_PARAM_REGS; i++)
 782                 arm_ldrfpx (code, i, ARMREG_FP, ccontext_offset + MONO_STRUCT_OFFSET (CallContext, fregs) + i * sizeof (double));
 783
 784         /* reset stack and return */
 785         arm_ldpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
 786         arm_addx_imm (code, ARMREG_SP, ARMREG_SP, framesize);
 787         arm_retx (code, ARMREG_LR);
 788
 789         g_assert (code - start < buf_len);
 790
 791         mono_arch_flush_icache (start, code - start);
 792         MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_EXCEPTION_HANDLING, NULL));
 793
 794         if (info)
 795                 *info = mono_tramp_info_create ("native_to_interp_trampoline", start, code - start, ji, unwind_ops);
 796
 797         return start;
 798 #else
 799         g_assert_not_reached ();
 800         return NULL;
 801 #endif /* DISABLE_INTERPRETER */
 802 }
 803
 804 #else /* DISABLE_JIT */
 805
 806 guchar*
 807 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
 808 {
 809         g_assert_not_reached ();
 810         return NULL;
 811 }
 812
 813 gpointer
 814 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
 815 {
 816         g_assert_not_reached ();
 817         return NULL;
 818 }
 819
 820 gpointer
 821 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
 822 {
 823         g_assert_not_reached ();
 824         return NULL;
 825 }
 826
 827 gpointer
 828 mono_arch_get_static_rgctx_trampoline (gpointer arg, gpointer addr)
 829 {
 830         g_assert_not_reached ();
 831         return NULL;
 832 }
 833
 834 gpointer
 835 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
 836 {
 837         g_assert_not_reached ();
 838         return NULL;
 839 }
 840
 841 gpointer
 842 mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
 843 {
 844         g_assert_not_reached ();
 845         return NULL;
 846 }
 847
 848 guint8*
 849 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
 850 {
 851         g_assert_not_reached ();
 852         return NULL;
 853 }
 854
 855 gpointer
 856 mono_arch_get_interp_to_native_trampoline (MonoTrampInfo **info)
 857 {
 858         g_assert_not_reached ();
 859         return NULL;
 860 }
 861
 862 gpointer
 863 mono_arch_get_native_to_interp_trampoline (MonoTrampInfo **info)
 864 {
 865         g_assert_not_reached ();
 866         return NULL;
 867 }
 868
 869 #endif /* !DISABLE_JIT */