3 * JIT trampoline code for ARM64
5 * Copyright 2013 Xamarin Inc
7 * Based on tramp-arm.c:
10 * Paolo Molaro (lupus@ximian.com)
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.
19 #include "debugger-agent.h"
21 #include <mono/arch/arm64/arm64-codegen.h>
22 #include <mono/metadata/abi-details.h>
24 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
27 mono_arch_patch_callsite (guint8 *method_start, guint8 *code_ptr, guint8 *addr)
29 mono_arm_patch (code_ptr - 4, addr, MONO_R_ARM64_BL);
30 mono_arch_flush_icache (code_ptr - 4, 4);
34 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
41 * Decode the address loaded by the PLT entry emitted by arch_emit_plt_entry () in
46 ins = ((guint32*)code) [0];
47 g_assert (((ins >> 24) & 0x1f) == 0x10);
48 disp = (((ins >> 5) & 0x7ffff) << 2) | ((ins >> 29) & 0x3);
49 /* FIXME: disp is signed */
50 g_assert ((disp >> 20) == 0);
52 slot_addr = ((guint64)code + (disp << 12)) & ~0xfff;
54 /* add x16, x16, :lo12:got */
55 ins = ((guint32*)code) [1];
56 g_assert (((ins >> 22) & 0x3) == 0);
57 slot_addr += (ins >> 10) & 0xfff;
59 /* ldr x16, [x16, <offset>] */
60 ins = ((guint32*)code) [2];
61 g_assert (((ins >> 24) & 0x3f) == 0x39);
62 slot_addr += ((ins >> 10) & 0xfff) * 8;
64 g_assert (*(guint64*)slot_addr);
65 *(gpointer*)slot_addr = addr;
69 mono_arch_get_call_target (guint8 *code)
76 imm = *(guint32*)code;
78 g_assert (((imm >> 31) & 0x1) == 0x1);
79 g_assert (((imm >> 26) & 0x7) == 0x5);
81 disp = (imm & 0x3ffffff);
82 if ((disp >> 25) != 0)
83 /* Negative, sing extend to 32 bits */
84 disp = disp | 0xfc000000;
86 return code + (disp * 4);
90 mono_arch_get_plt_info_offset (guint8 *plt_entry, mgreg_t *regs, guint8 *code)
92 /* The offset is stored as the 5th word of the plt entry */
93 return ((guint32*)plt_entry) [4];
97 mono_arm_handler_block_trampoline_helper (gpointer *ptr)
99 MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
100 return jit_tls->handler_block_return_address;
106 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
108 guint8 *code, *buf, *tramp, *labels [16];
110 int frame_size, offset, gregs_offset, num_fregs, fregs_offset, arg_offset, lmf_offset, res_offset;
111 guint64 gregs_regset;
112 GSList *unwind_ops = NULL;
113 MonoJumpInfo *ji = NULL;
117 buf = code = mono_global_codeman_reserve (buf_len);
120 * We are getting called by a specific trampoline, ip1 contains the trampoline argument.
123 /* Compute stack frame size and offsets */
128 gregs_offset = offset;
131 // FIXME: Save 128 bits
132 /* Only have to save the argument regs */
134 fregs_offset = offset;
135 offset += num_fregs * 8;
144 offset += sizeof (MonoLMF);
146 frame_size = ALIGN_TO (offset, MONO_ARCH_FRAME_ALIGNMENT);
148 /* Setup stack frame */
151 arm_subx_imm (code, ARMREG_SP, ARMREG_SP, 256);
154 arm_subx_imm (code, ARMREG_SP, ARMREG_SP, imm);
155 arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
156 arm_movspx (code, ARMREG_FP, ARMREG_SP);
159 // FIXME: Optimize this
160 gregs_regset = ~((1 << ARMREG_FP) | (1 << ARMREG_SP));
161 code = mono_arm_emit_store_regarray (code, gregs_regset, ARMREG_FP, gregs_offset);
163 for (i = 0; i < num_fregs; ++i)
164 arm_strfpx (code, i, ARMREG_FP, fregs_offset + (i * 8));
165 /* Save trampoline arg */
166 arm_strx (code, ARMREG_IP1, ARMREG_FP, arg_offset);
169 arm_addx_imm (code, ARMREG_IP0, ARMREG_FP, lmf_offset);
170 code = mono_arm_emit_store_regset (code, MONO_ARCH_LMF_REGS, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, gregs));
172 arm_ldrx (code, ARMREG_IP1, ARMREG_FP, 0);
173 arm_strx (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, gregs) + (MONO_ARCH_LMF_REG_FP * 8));
175 arm_movx (code, ARMREG_IP1, ARMREG_FP);
178 arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, 256);
181 arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, imm);
182 arm_strx (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, gregs) + (MONO_ARCH_LMF_REG_SP * 8));
184 if (tramp_type == MONO_TRAMPOLINE_JUMP)
185 arm_movx (code, ARMREG_LR, ARMREG_RZR);
187 arm_ldrx (code, ARMREG_LR, ARMREG_FP, 8);
188 arm_strx (code, ARMREG_LR, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, pc));
191 /* Similar to emit_save_lmf () */
193 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
195 tramp = (guint8*)mono_get_lmf_addr;
196 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
198 arm_blrx (code, ARMREG_IP0);
199 /* r0 contains the address of the tls slot holding the current lmf */
201 arm_addx_imm (code, ARMREG_IP0, ARMREG_FP, lmf_offset);
202 /* lmf->lmf_addr = lmf_addr */
203 arm_strx (code, ARMREG_R0, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
204 /* lmf->previous_lmf = *lmf_addr */
205 arm_ldrx (code, ARMREG_IP1, ARMREG_R0, 0);
206 arm_strx (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
207 /* *lmf_addr = lmf */
208 arm_strx (code, ARMREG_IP0, ARMREG_R0, 0);
210 /* Call the C trampoline function */
212 arm_addx_imm (code, ARMREG_R0, ARMREG_FP, gregs_offset);
214 if (tramp_type == MONO_TRAMPOLINE_JUMP)
215 arm_movx (code, ARMREG_R1, ARMREG_RZR);
217 arm_ldrx (code, ARMREG_R1, ARMREG_FP, gregs_offset + (ARMREG_LR * 8));
219 if (MONO_TRAMPOLINE_TYPE_HAS_ARG (tramp_type))
221 arm_ldrx (code, ARMREG_R2, ARMREG_FP, gregs_offset + (ARMREG_R0 * 8));
223 arm_ldrx (code, ARMREG_R2, ARMREG_FP, arg_offset);
224 /* Arg 4 = trampoline addr */
225 arm_movx (code, ARMREG_R3, ARMREG_RZR);
228 char *icall_name = g_strdup_printf ("trampoline_func_%d", tramp_type);
229 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, icall_name);
231 tramp = (guint8*)mono_get_trampoline_func (tramp_type);
232 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
234 arm_blrx (code, ARMREG_IP0);
236 /* Save the result */
237 arm_strx (code, ARMREG_R0, ARMREG_FP, res_offset);
240 /* Similar to emit_restore_lmf () */
241 /* Clobbers ip0/ip1 */
243 arm_addx_imm (code, ARMREG_IP0, ARMREG_FP, lmf_offset);
244 /* ip1 = lmf->previous_lmf */
245 arm_ldrx (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
246 /* ip0 = lmf->lmf_addr */
247 arm_ldrx (code, ARMREG_IP0, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
248 /* *lmf_addr = previous_lmf */
249 arm_strx (code, ARMREG_IP1, ARMREG_IP0, 0);
251 /* Check for thread interruption */
252 /* This is not perf critical code so no need to check the interrupt flag */
254 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_force_interruption_checkpoint_noraise");
256 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)mono_thread_force_interruption_checkpoint_noraise);
258 arm_blrx (code, ARMREG_IP0);
259 /* Check whenever there is an exception to be thrown */
261 arm_cbnzx (code, ARMREG_R0, 0);
266 /* Only have to load the argument regs (r0..r8) and the rgctx reg */
267 code = mono_arm_emit_load_regarray (code, 0x1ff | (1 << ARMREG_LR) | (1 << MONO_ARCH_RGCTX_REG), ARMREG_FP, gregs_offset);
269 for (i = 0; i < num_fregs; ++i)
270 arm_ldrfpx (code, i, ARMREG_FP, fregs_offset + (i * 8));
272 /* Load the result */
273 arm_ldrx (code, ARMREG_IP1, ARMREG_FP, res_offset);
275 /* These trampolines return a value */
276 if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
277 arm_movx (code, ARMREG_R0, ARMREG_IP1);
280 code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0)));
282 if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
283 arm_retx (code, ARMREG_LR);
285 arm_brx (code, ARMREG_IP1);
288 mono_arm_patch (labels [0], code, MONO_R_ARM64_CBZ);
291 * We have an exception we want to throw in the caller's frame, so pop
292 * the trampoline frame and throw from the caller.
294 code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0)));
295 /* We are in the parent frame, the exception is in x0 */
297 * EH is initialized after trampolines, so get the address of the variable
298 * which contains throw_exception, and load it from there.
301 /* Not really a jit icall */
302 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "throw_exception_addr");
304 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)mono_get_throw_exception_addr ());
306 arm_ldrx (code, ARMREG_IP0, ARMREG_IP0, 0);
307 /* lr contains the return address, the trampoline will use it as the throw site */
308 arm_brx (code, ARMREG_IP0);
310 g_assert ((code - buf) < buf_len);
311 mono_arch_flush_icache (buf, code - buf);
314 tramp_name = mono_get_generic_trampoline_name (tramp_type);
315 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
323 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
325 guint8 *code, *buf, *tramp;
329 * Return a trampoline which calls generic trampoline TRAMP_TYPE passing in ARG1.
330 * Pass the argument in ip1, clobbering ip0.
332 tramp = mono_get_trampoline_code (tramp_type);
334 buf = code = mono_global_codeman_reserve (buf_len);
336 code = mono_arm_emit_imm64 (code, ARMREG_IP1, (guint64)arg1);
337 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
339 arm_brx (code, ARMREG_IP0);
341 g_assert ((code - buf) < buf_len);
342 mono_arch_flush_icache (buf, code - buf);
344 *code_len = code - buf;
350 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
352 guint8 *code, *start;
354 MonoDomain *domain = mono_domain_get ();
356 start = code = mono_domain_code_reserve (domain, size);
357 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
358 arm_addx_imm (code, ARMREG_R0, ARMREG_R0, sizeof (MonoObject));
359 arm_brx (code, ARMREG_IP0);
361 g_assert ((code - start) <= size);
362 mono_arch_flush_icache (start, code - start);
367 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
369 guint8 *code, *start;
370 guint32 buf_len = 32;
371 MonoDomain *domain = mono_domain_get ();
373 start = code = mono_domain_code_reserve (domain, buf_len);
374 code = mono_arm_emit_imm64 (code, MONO_ARCH_RGCTX_REG, (guint64)mrgctx);
375 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
376 arm_brx (code, ARMREG_IP0);
378 g_assert ((code - start) <= buf_len);
380 mono_arch_flush_icache (start, code - start);
386 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
390 int i, depth, index, njumps;
392 guint8 **rgctx_null_jumps;
393 MonoJumpInfo *ji = NULL;
394 GSList *unwind_ops = NULL;
398 is_mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
399 index = MONO_RGCTX_SLOT_INDEX (slot);
401 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
402 for (depth = 0; ; ++depth) {
403 int size = mono_class_rgctx_get_array_size (depth, is_mrgctx);
405 if (index < size - 1)
410 buf_size = 64 + 16 * depth;
411 code = buf = mono_global_codeman_reserve (buf_size);
413 rgctx_null_jumps = g_malloc0 (sizeof (guint8*) * (depth + 2));
416 /* The vtable/mrgtx is in R0 */
417 g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
421 arm_movx (code, ARMREG_IP1, ARMREG_R0);
423 /* load rgctx ptr from vtable */
424 code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_R0, MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context));
425 /* is the rgctx ptr null? */
426 /* if yes, jump to actual trampoline */
427 rgctx_null_jumps [njumps ++] = code;
428 arm_cbzx (code, ARMREG_IP1, 0);
431 for (i = 0; i < depth; ++i) {
432 /* load ptr to next array */
433 if (is_mrgctx && i == 0) {
434 code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT);
436 code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, 0);
438 /* is the ptr null? */
439 /* if yes, jump to actual trampoline */
440 rgctx_null_jumps [njumps ++] = code;
441 arm_cbzx (code, ARMREG_IP1, 0);
445 code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, sizeof (gpointer) * (index + 1));
446 /* is the slot null? */
447 /* if yes, jump to actual trampoline */
448 rgctx_null_jumps [njumps ++] = code;
449 arm_cbzx (code, ARMREG_IP1, 0);
450 /* otherwise return, result is in IP1 */
451 arm_movx (code, ARMREG_R0, ARMREG_IP1);
452 arm_brx (code, ARMREG_LR);
454 g_assert (njumps <= depth + 2);
455 for (i = 0; i < njumps; ++i)
456 mono_arm_patch (rgctx_null_jumps [i], code, MONO_R_ARM64_CBZ);
458 g_free (rgctx_null_jumps);
462 /* Call mono_rgctx_lazy_fetch_trampoline (), passing in the slot as argument */
463 /* The vtable/mrgctx is still in R0 */
465 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));
467 tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), &code_len);
468 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
470 arm_brx (code, ARMREG_IP0);
472 mono_arch_flush_icache (buf, code - buf);
474 g_assert (code - buf <= buf_size);
477 char *name = mono_get_rgctx_fetch_trampoline_name (slot);
478 *info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);
486 mono_arch_create_general_rgctx_lazy_fetch_trampoline (MonoTrampInfo **info, gboolean aot)
490 MonoJumpInfo *ji = NULL;
491 GSList *unwind_ops = NULL;
497 code = buf = mono_global_codeman_reserve (tramp_size);
499 mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, 0);
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);
508 mono_arch_flush_icache (buf, code - buf);
510 g_assert (code - buf <= tramp_size);
513 *info = mono_tramp_info_create ("rgctx_fetch_trampoline_general", buf, code - buf, ji, unwind_ops);
519 mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
524 MonoJumpInfo *ji = NULL;
525 GSList *unwind_ops = NULL;
527 code = buf = mono_global_codeman_reserve (tramp_size);
532 This trampoline restore the call chain of the handler block then jumps into the code that deals with it.
536 * We are in a method frame after the call emitted by OP_CALL_HANDLER.
539 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_arm_handler_block_trampoline_helper");
541 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)mono_arm_handler_block_trampoline_helper);
542 /* Set it as the return address so the trampoline will return to it */
543 arm_movx (code, ARMREG_LR, ARMREG_IP0);
545 /* Call the trampoline */
547 char *name = g_strdup_printf ("trampoline_func_%d", MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD);
548 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, name);
550 tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD, NULL, NULL);
551 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
553 arm_brx (code, ARMREG_IP0);
555 mono_arch_flush_icache (buf, code - buf);
556 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
557 g_assert (code - buf <= tramp_size);
559 *info = mono_tramp_info_create ("handler_block_trampoline", buf, code - buf, ji, unwind_ops);
565 * mono_arch_create_sdb_trampoline:
567 * Return a trampoline which captures the current context, passes it to
568 * debugger_agent_single_step_from_context ()/debugger_agent_breakpoint_from_context (),
569 * then restores the (potentially changed) context.
572 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
574 int tramp_size = 512;
575 int offset, imm, frame_size, ctx_offset;
576 guint64 gregs_regset;
578 GSList *unwind_ops = NULL;
579 MonoJumpInfo *ji = NULL;
581 code = buf = mono_global_codeman_reserve (tramp_size);
583 /* Compute stack frame size and offsets */
589 offset += sizeof (MonoContext);
590 offset = ALIGN_TO (offset, MONO_ARCH_FRAME_ALIGNMENT);
593 // FIXME: Unwind info
595 /* Setup stack frame */
598 arm_subx_imm (code, ARMREG_SP, ARMREG_SP, 256);
601 arm_subx_imm (code, ARMREG_SP, ARMREG_SP, imm);
602 arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
603 arm_movspx (code, ARMREG_FP, ARMREG_SP);
605 /* Initialize a MonoContext structure on the stack */
606 /* No need to save fregs */
607 gregs_regset = ~((1 << ARMREG_FP) | (1 << ARMREG_SP));
608 code = mono_arm_emit_store_regarray (code, gregs_regset, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs));
610 arm_ldrx (code, ARMREG_IP1, ARMREG_FP, 0);
611 arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_FP * 8));
613 arm_movx (code, ARMREG_IP1, ARMREG_FP);
616 arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, 256);
619 arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, imm);
620 arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_SP * 8));
622 arm_ldrx (code, ARMREG_IP1, ARMREG_FP, 8);
623 arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, pc));
625 /* Call the single step/breakpoint function in sdb */
627 arm_addx_imm (code, ARMREG_R0, ARMREG_FP, ctx_offset);
630 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "debugger_agent_single_step_from_context");
632 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "debugger_agent_breakpoint_from_context");
634 gpointer addr = single_step ? debugger_agent_single_step_from_context : debugger_agent_breakpoint_from_context;
636 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
638 arm_blrx (code, ARMREG_IP0);
641 /* Save fp/pc into the frame block */
642 arm_ldrx (code, ARMREG_IP0, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_FP * 8));
643 arm_strx (code, ARMREG_IP0, ARMREG_FP, 0);
644 arm_ldrx (code, ARMREG_IP0, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, pc));
645 arm_strx (code, ARMREG_IP0, ARMREG_FP, 8);
646 gregs_regset = ~((1 << ARMREG_FP) | (1 << ARMREG_SP));
647 code = mono_arm_emit_load_regarray (code, gregs_regset, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs));
649 code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0) | (1 << ARMREG_IP1)));
651 arm_retx (code, ARMREG_LR);
653 mono_arch_flush_icache (code, code - buf);
654 g_assert (code - buf <= tramp_size);
656 const char *tramp_name = single_step ? "sdb_single_step_trampoline" : "sdb_breakpoint_trampoline";
657 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
662 #else /* DISABLE_JIT */
665 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
667 g_assert_not_reached ();
672 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
674 g_assert_not_reached ();
679 mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
681 g_assert_not_reached ();
686 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
688 g_assert_not_reached ();
693 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
695 g_assert_not_reached ();
700 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
702 g_assert_not_reached ();
707 mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
709 g_assert_not_reached ();
714 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
716 g_assert_not_reached ();
720 #endif /* !DISABLE_JIT */