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 #ifdef ENABLE_INTERPRETER
25 #include "interp/interp.h"
29 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
32 mono_arch_patch_callsite (guint8 *method_start, guint8 *code_ptr, guint8 *addr)
34 mono_arm_patch (code_ptr - 4, addr, MONO_R_ARM64_BL);
35 mono_arch_flush_icache (code_ptr - 4, 4);
39 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
46 * Decode the address loaded by the PLT entry emitted by arch_emit_plt_entry () in
51 ins = ((guint32*)code) [0];
52 g_assert (((ins >> 24) & 0x1f) == 0x10);
53 disp = (((ins >> 5) & 0x7ffff) << 2) | ((ins >> 29) & 0x3);
54 /* FIXME: disp is signed */
55 g_assert ((disp >> 20) == 0);
57 slot_addr = ((guint64)code + (disp << 12)) & ~0xfff;
59 /* add x16, x16, :lo12:got */
60 ins = ((guint32*)code) [1];
61 g_assert (((ins >> 22) & 0x3) == 0);
62 slot_addr += (ins >> 10) & 0xfff;
64 /* ldr x16, [x16, <offset>] */
65 ins = ((guint32*)code) [2];
66 g_assert (((ins >> 24) & 0x3f) == 0x39);
67 slot_addr += ((ins >> 10) & 0xfff) * 8;
69 g_assert (*(guint64*)slot_addr);
70 *(gpointer*)slot_addr = addr;
74 mono_arch_get_call_target (guint8 *code)
81 imm = *(guint32*)code;
82 /* Should be a b/bl */
83 g_assert (((imm >> 26) & 0x7) == 0x5);
85 disp = (imm & 0x3ffffff);
86 if ((disp >> 25) != 0)
87 /* Negative, sing extend to 32 bits */
88 disp = disp | 0xfc000000;
90 return code + (disp * 4);
94 mono_arch_get_plt_info_offset (guint8 *plt_entry, mgreg_t *regs, guint8 *code)
96 /* The offset is stored as the 5th word of the plt entry */
97 return ((guint32*)plt_entry) [4];
101 mono_arm_handler_block_trampoline_helper (gpointer *ptr)
103 MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
104 return jit_tls->handler_block_return_address;
110 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
112 guint8 *code, *buf, *tramp, *labels [16];
114 int frame_size, offset, gregs_offset, num_fregs, fregs_offset, arg_offset, lmf_offset, res_offset;
115 guint64 gregs_regset;
116 GSList *unwind_ops = NULL;
117 MonoJumpInfo *ji = NULL;
121 buf = code = mono_global_codeman_reserve (buf_len);
124 * We are getting called by a specific trampoline, ip1 contains the trampoline argument.
127 /* Compute stack frame size and offsets */
132 gregs_offset = offset;
135 // FIXME: Save 128 bits
136 /* Only have to save the argument regs */
138 fregs_offset = offset;
139 offset += num_fregs * 8;
148 offset += sizeof (MonoLMF);
150 frame_size = ALIGN_TO (offset, MONO_ARCH_FRAME_ALIGNMENT);
152 /* Setup stack frame */
155 arm_subx_imm (code, ARMREG_SP, ARMREG_SP, 256);
158 arm_subx_imm (code, ARMREG_SP, ARMREG_SP, imm);
159 arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
160 arm_movspx (code, ARMREG_FP, ARMREG_SP);
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);
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);
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));
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));
179 arm_movx (code, ARMREG_IP1, ARMREG_FP);
182 arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, 256);
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));
188 if (tramp_type == MONO_TRAMPOLINE_JUMP)
189 arm_movx (code, ARMREG_LR, ARMREG_RZR);
191 arm_ldrx (code, ARMREG_LR, ARMREG_FP, 8);
192 arm_strx (code, ARMREG_LR, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, pc));
195 /* Similar to emit_save_lmf () */
197 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
199 tramp = (guint8*)mono_get_lmf_addr;
200 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
202 arm_blrx (code, ARMREG_IP0);
203 /* r0 contains the address of the tls slot holding the current lmf */
205 arm_addx_imm (code, ARMREG_IP0, ARMREG_FP, lmf_offset);
206 /* lmf->lmf_addr = lmf_addr */
207 arm_strx (code, ARMREG_R0, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
208 /* lmf->previous_lmf = *lmf_addr */
209 arm_ldrx (code, ARMREG_IP1, ARMREG_R0, 0);
210 arm_strx (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
211 /* *lmf_addr = lmf */
212 arm_strx (code, ARMREG_IP0, ARMREG_R0, 0);
214 /* Call the C trampoline function */
216 arm_addx_imm (code, ARMREG_R0, ARMREG_FP, gregs_offset);
218 if (tramp_type == MONO_TRAMPOLINE_JUMP)
219 arm_movx (code, ARMREG_R1, ARMREG_RZR);
221 arm_ldrx (code, ARMREG_R1, ARMREG_FP, gregs_offset + (ARMREG_LR * 8));
223 if (MONO_TRAMPOLINE_TYPE_HAS_ARG (tramp_type))
225 arm_ldrx (code, ARMREG_R2, ARMREG_FP, gregs_offset + (ARMREG_R0 * 8));
227 arm_ldrx (code, ARMREG_R2, ARMREG_FP, arg_offset);
228 /* Arg 4 = trampoline addr */
229 arm_movx (code, ARMREG_R3, ARMREG_RZR);
232 char *icall_name = g_strdup_printf ("trampoline_func_%d", tramp_type);
233 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, icall_name);
235 tramp = (guint8*)mono_get_trampoline_func (tramp_type);
236 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
238 arm_blrx (code, ARMREG_IP0);
240 /* Save the result */
241 arm_strx (code, ARMREG_R0, ARMREG_FP, res_offset);
244 /* Similar to emit_restore_lmf () */
245 /* Clobbers ip0/ip1 */
247 arm_addx_imm (code, ARMREG_IP0, ARMREG_FP, lmf_offset);
248 /* ip1 = lmf->previous_lmf */
249 arm_ldrx (code, ARMREG_IP1, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
250 /* ip0 = lmf->lmf_addr */
251 arm_ldrx (code, ARMREG_IP0, ARMREG_IP0, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
252 /* *lmf_addr = previous_lmf */
253 arm_strx (code, ARMREG_IP1, ARMREG_IP0, 0);
255 /* Check for thread interruption */
256 /* This is not perf critical code so no need to check the interrupt flag */
258 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_force_interruption_checkpoint_noraise");
260 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)mono_thread_force_interruption_checkpoint_noraise);
262 arm_blrx (code, ARMREG_IP0);
263 /* Check whenever there is an exception to be thrown */
265 arm_cbnzx (code, ARMREG_R0, 0);
270 /* Only have to load the argument regs (r0..r8) and the rgctx reg */
271 code = mono_arm_emit_load_regarray (code, 0x1ff | (1 << ARMREG_LR) | (1 << MONO_ARCH_RGCTX_REG), ARMREG_FP, gregs_offset);
273 for (i = 0; i < num_fregs; ++i)
274 arm_ldrfpx (code, i, ARMREG_FP, fregs_offset + (i * 8));
276 /* Load the result */
277 arm_ldrx (code, ARMREG_IP1, ARMREG_FP, res_offset);
279 /* These trampolines return a value */
280 if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
281 arm_movx (code, ARMREG_R0, ARMREG_IP1);
284 code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0)));
286 if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
287 arm_retx (code, ARMREG_LR);
289 arm_brx (code, ARMREG_IP1);
292 mono_arm_patch (labels [0], code, MONO_R_ARM64_CBZ);
295 * We have an exception we want to throw in the caller's frame, so pop
296 * the trampoline frame and throw from the caller.
298 code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0)));
299 /* We are in the parent frame, the exception is in x0 */
301 * EH is initialized after trampolines, so get the address of the variable
302 * which contains throw_exception, and load it from there.
305 /* Not really a jit icall */
306 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "throw_exception_addr");
308 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)mono_get_throw_exception_addr ());
310 arm_ldrx (code, ARMREG_IP0, ARMREG_IP0, 0);
311 /* lr contains the return address, the trampoline will use it as the throw site */
312 arm_brx (code, ARMREG_IP0);
314 g_assert ((code - buf) < buf_len);
315 mono_arch_flush_icache (buf, code - buf);
318 tramp_name = mono_get_generic_trampoline_name (tramp_type);
319 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
327 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
329 guint8 *code, *buf, *tramp;
333 * Return a trampoline which calls generic trampoline TRAMP_TYPE passing in ARG1.
334 * Pass the argument in ip1, clobbering ip0.
336 tramp = mono_get_trampoline_code (tramp_type);
338 buf = code = mono_global_codeman_reserve (buf_len);
340 code = mono_arm_emit_imm64 (code, ARMREG_IP1, (guint64)arg1);
341 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
343 arm_brx (code, ARMREG_IP0);
345 g_assert ((code - buf) < buf_len);
346 mono_arch_flush_icache (buf, code - buf);
348 *code_len = code - buf;
354 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
356 guint8 *code, *start;
358 MonoDomain *domain = mono_domain_get ();
360 start = code = mono_domain_code_reserve (domain, size);
361 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
362 arm_addx_imm (code, ARMREG_R0, ARMREG_R0, sizeof (MonoObject));
363 arm_brx (code, ARMREG_IP0);
365 g_assert ((code - start) <= size);
366 mono_arch_flush_icache (start, code - start);
371 mono_arch_get_static_rgctx_trampoline (gpointer arg, gpointer addr)
373 guint8 *code, *start;
374 guint32 buf_len = 32;
375 MonoDomain *domain = mono_domain_get ();
377 start = code = mono_domain_code_reserve (domain, buf_len);
378 code = mono_arm_emit_imm64 (code, MONO_ARCH_RGCTX_REG, (guint64)arg);
379 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
380 arm_brx (code, ARMREG_IP0);
382 g_assert ((code - start) <= buf_len);
384 mono_arch_flush_icache (start, code - start);
390 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
394 int i, depth, index, njumps;
396 guint8 **rgctx_null_jumps;
397 MonoJumpInfo *ji = NULL;
398 GSList *unwind_ops = NULL;
402 is_mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
403 index = MONO_RGCTX_SLOT_INDEX (slot);
405 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
406 for (depth = 0; ; ++depth) {
407 int size = mono_class_rgctx_get_array_size (depth, is_mrgctx);
409 if (index < size - 1)
414 buf_size = 64 + 16 * depth;
415 code = buf = mono_global_codeman_reserve (buf_size);
417 rgctx_null_jumps = g_malloc0 (sizeof (guint8*) * (depth + 2));
420 /* The vtable/mrgtx is in R0 */
421 g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
425 arm_movx (code, ARMREG_IP1, ARMREG_R0);
427 /* load rgctx ptr from vtable */
428 code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_R0, MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context));
429 /* is the rgctx ptr null? */
430 /* if yes, jump to actual trampoline */
431 rgctx_null_jumps [njumps ++] = code;
432 arm_cbzx (code, ARMREG_IP1, 0);
435 for (i = 0; i < depth; ++i) {
436 /* load ptr to next array */
437 if (is_mrgctx && i == 0) {
438 code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT);
440 code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, 0);
442 /* is the ptr null? */
443 /* if yes, jump to actual trampoline */
444 rgctx_null_jumps [njumps ++] = code;
445 arm_cbzx (code, ARMREG_IP1, 0);
449 code = mono_arm_emit_ldrx (code, ARMREG_IP1, ARMREG_IP1, sizeof (gpointer) * (index + 1));
450 /* is the slot null? */
451 /* if yes, jump to actual trampoline */
452 rgctx_null_jumps [njumps ++] = code;
453 arm_cbzx (code, ARMREG_IP1, 0);
454 /* otherwise return, result is in IP1 */
455 arm_movx (code, ARMREG_R0, ARMREG_IP1);
456 arm_brx (code, ARMREG_LR);
458 g_assert (njumps <= depth + 2);
459 for (i = 0; i < njumps; ++i)
460 mono_arm_patch (rgctx_null_jumps [i], code, MONO_R_ARM64_CBZ);
462 g_free (rgctx_null_jumps);
466 /* Call mono_rgctx_lazy_fetch_trampoline (), passing in the slot as argument */
467 /* The vtable/mrgctx is still in R0 */
469 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));
471 tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), &code_len);
472 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
474 arm_brx (code, ARMREG_IP0);
476 mono_arch_flush_icache (buf, code - buf);
478 g_assert (code - buf <= buf_size);
481 char *name = mono_get_rgctx_fetch_trampoline_name (slot);
482 *info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);
490 mono_arch_create_general_rgctx_lazy_fetch_trampoline (MonoTrampInfo **info, gboolean aot)
494 MonoJumpInfo *ji = NULL;
495 GSList *unwind_ops = NULL;
501 code = buf = mono_global_codeman_reserve (tramp_size);
503 mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, 0);
505 // FIXME: Currently, we always go to the slow path.
506 /* Load trampoline addr */
507 arm_ldrx (code, ARMREG_IP0, MONO_ARCH_RGCTX_REG, 8);
508 /* The vtable/mrgctx is in R0 */
509 g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
510 arm_brx (code, ARMREG_IP0);
512 mono_arch_flush_icache (buf, code - buf);
514 g_assert (code - buf <= tramp_size);
517 *info = mono_tramp_info_create ("rgctx_fetch_trampoline_general", buf, code - buf, ji, unwind_ops);
523 mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
528 MonoJumpInfo *ji = NULL;
529 GSList *unwind_ops = NULL;
531 code = buf = mono_global_codeman_reserve (tramp_size);
536 This trampoline restore the call chain of the handler block then jumps into the code that deals with it.
540 * We are in a method frame after the call emitted by OP_CALL_HANDLER.
542 /* Call a helper to obtain jit_tls->handler_block_return_address */
544 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_arm_handler_block_trampoline_helper");
546 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)mono_arm_handler_block_trampoline_helper);
547 arm_blrx (code, ARMREG_IP0);
548 /* Set it as the return address so the trampoline will return to it */
549 arm_movx (code, ARMREG_LR, ARMREG_R0);
551 /* Call the C trampoline function */
553 char *name = g_strdup_printf ("trampoline_func_%d", MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD);
554 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, name);
556 tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD, NULL, NULL);
557 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)tramp);
559 arm_brx (code, ARMREG_IP0);
561 mono_arch_flush_icache (buf, code - buf);
562 MONO_PROFILER_RAISE (jit_code_buffer, (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL));
563 g_assert (code - buf <= tramp_size);
565 *info = mono_tramp_info_create ("handler_block_trampoline", buf, code - buf, ji, unwind_ops);
571 * mono_arch_create_sdb_trampoline:
573 * Return a trampoline which captures the current context, passes it to
574 * debugger_agent_single_step_from_context ()/debugger_agent_breakpoint_from_context (),
575 * then restores the (potentially changed) context.
578 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
580 int tramp_size = 512;
581 int offset, imm, frame_size, ctx_offset;
582 guint64 gregs_regset;
584 GSList *unwind_ops = NULL;
585 MonoJumpInfo *ji = NULL;
587 code = buf = mono_global_codeman_reserve (tramp_size);
589 /* Compute stack frame size and offsets */
595 offset += sizeof (MonoContext);
596 offset = ALIGN_TO (offset, MONO_ARCH_FRAME_ALIGNMENT);
599 // FIXME: Unwind info
601 /* Setup stack frame */
604 arm_subx_imm (code, ARMREG_SP, ARMREG_SP, 256);
607 arm_subx_imm (code, ARMREG_SP, ARMREG_SP, imm);
608 arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
609 arm_movspx (code, ARMREG_FP, ARMREG_SP);
611 /* Initialize a MonoContext structure on the stack */
612 /* No need to save fregs */
613 gregs_regset = ~((1 << ARMREG_FP) | (1 << ARMREG_SP));
614 code = mono_arm_emit_store_regarray (code, gregs_regset, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs));
616 arm_ldrx (code, ARMREG_IP1, ARMREG_FP, 0);
617 arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_FP * 8));
619 arm_movx (code, ARMREG_IP1, ARMREG_FP);
622 arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, 256);
625 arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, imm);
626 arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_SP * 8));
628 arm_ldrx (code, ARMREG_IP1, ARMREG_FP, 8);
629 arm_strx (code, ARMREG_IP1, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, pc));
631 /* Call the single step/breakpoint function in sdb */
633 arm_addx_imm (code, ARMREG_R0, ARMREG_FP, ctx_offset);
636 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "debugger_agent_single_step_from_context");
638 code = mono_arm_emit_aotconst (&ji, code, buf, ARMREG_IP0, MONO_PATCH_INFO_JIT_ICALL_ADDR, "debugger_agent_breakpoint_from_context");
640 gpointer addr = single_step ? debugger_agent_single_step_from_context : debugger_agent_breakpoint_from_context;
642 code = mono_arm_emit_imm64 (code, ARMREG_IP0, (guint64)addr);
644 arm_blrx (code, ARMREG_IP0);
647 /* Save fp/pc into the frame block */
648 arm_ldrx (code, ARMREG_IP0, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs) + (ARMREG_FP * 8));
649 arm_strx (code, ARMREG_IP0, ARMREG_FP, 0);
650 arm_ldrx (code, ARMREG_IP0, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, pc));
651 arm_strx (code, ARMREG_IP0, ARMREG_FP, 8);
652 gregs_regset = ~((1 << ARMREG_FP) | (1 << ARMREG_SP));
653 code = mono_arm_emit_load_regarray (code, gregs_regset, ARMREG_FP, ctx_offset + G_STRUCT_OFFSET (MonoContext, regs));
655 code = mono_arm_emit_destroy_frame (code, frame_size, ((1 << ARMREG_IP0) | (1 << ARMREG_IP1)));
657 arm_retx (code, ARMREG_LR);
659 mono_arch_flush_icache (code, code - buf);
660 g_assert (code - buf <= tramp_size);
662 const char *tramp_name = single_step ? "sdb_single_step_trampoline" : "sdb_breakpoint_trampoline";
663 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
669 * mono_arch_get_enter_icall_trampoline:
671 * See tramp-amd64.c for documentation.
674 mono_arch_get_enter_icall_trampoline (MonoTrampInfo **info)
676 #ifdef ENABLE_INTERPRETER
677 const int gregs_num = INTERP_ICALL_TRAMP_IARGS;
678 const int fregs_num = INTERP_ICALL_TRAMP_FARGS;
680 guint8 *start = NULL, *code, *label_gexits [gregs_num], *label_fexits [fregs_num], *label_leave_tramp [3], *label_is_float_ret;
681 MonoJumpInfo *ji = NULL;
682 GSList *unwind_ops = NULL;
683 int buf_len, i, framesize = 0, off_methodargs, off_targetaddr;
685 buf_len = 512 + 1024;
686 start = code = (guint8 *) mono_global_codeman_reserve (buf_len);
689 framesize += 2 * sizeof (mgreg_t);
691 off_methodargs = framesize;
692 framesize += sizeof (mgreg_t);
694 off_targetaddr = framesize;
695 framesize += sizeof (mgreg_t);
697 framesize = ALIGN_TO (framesize, MONO_ARCH_FRAME_ALIGNMENT);
699 /* allocate space on stack for argument passing */
700 const int stack_space = ALIGN_TO (((gregs_num - ARMREG_R7) * sizeof (mgreg_t)), MONO_ARCH_FRAME_ALIGNMENT);
702 arm_subx_imm (code, ARMREG_SP, ARMREG_SP, stack_space + framesize);
703 arm_stpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, stack_space);
704 arm_addx_imm (code, ARMREG_FP, ARMREG_SP, stack_space);
706 /* save InterpMethodArguments* onto stack */
707 arm_strx (code, ARMREG_R1, ARMREG_FP, off_methodargs);
709 /* save target address onto stack */
710 arm_strx (code, ARMREG_R0, ARMREG_FP, off_targetaddr);
712 /* load pointer to InterpMethodArguments* into IP0 */
713 arm_movx (code, ARMREG_IP0, ARMREG_R1);
715 /* move flen into R9 */
716 arm_ldrx (code, ARMREG_R9, ARMREG_IP0, MONO_STRUCT_OFFSET (InterpMethodArguments, flen));
717 /* load pointer to fargs into R10 */
718 arm_ldrx (code, ARMREG_R10, ARMREG_IP0, MONO_STRUCT_OFFSET (InterpMethodArguments, fargs));
720 for (i = 0; i < fregs_num; ++i) {
721 arm_cmpx_imm (code, ARMREG_R9, 0);
722 label_fexits [i] = code;
723 arm_bcc (code, ARMCOND_EQ, 0);
725 g_assert (i <= ARMREG_D7); /* otherwise, need to pass args on stack */
726 arm_ldrfpx (code, i, ARMREG_R10, i * sizeof (double));
727 arm_subx_imm (code, ARMREG_R9, ARMREG_R9, 1);
730 for (i = 0; i < fregs_num; i++)
731 mono_arm_patch (label_fexits [i], code, MONO_R_ARM64_BCC);
733 /* move ilen into R9 */
734 arm_ldrx (code, ARMREG_R9, ARMREG_IP0, MONO_STRUCT_OFFSET (InterpMethodArguments, ilen));
735 /* load pointer to iargs into R10 */
736 arm_ldrx (code, ARMREG_R10, ARMREG_IP0, MONO_STRUCT_OFFSET (InterpMethodArguments, iargs));
738 int stack_offset = 0;
739 for (i = 0; i < gregs_num; i++) {
740 arm_cmpx_imm (code, ARMREG_R9, 0);
741 label_gexits [i] = code;
742 arm_bcc (code, ARMCOND_EQ, 0);
744 if (i <= ARMREG_R7) {
745 arm_ldrx (code, i, ARMREG_R10, i * sizeof (mgreg_t));
747 arm_ldrx (code, ARMREG_R11, ARMREG_R10, i * sizeof (mgreg_t));
748 arm_strx (code, ARMREG_R11, ARMREG_SP, stack_offset);
749 stack_offset += sizeof (mgreg_t);
751 arm_subx_imm (code, ARMREG_R9, ARMREG_R9, 1);
754 for (i = 0; i < gregs_num; i++)
755 mono_arm_patch (label_gexits [i], code, MONO_R_ARM64_BCC);
757 /* load target addr */
758 arm_ldrx (code, ARMREG_R11, ARMREG_FP, off_targetaddr);
760 /* call into native function */
761 arm_blrx (code, ARMREG_R11);
763 /* load InterpMethodArguments */
764 arm_ldrx (code, ARMREG_IP0, ARMREG_FP, off_methodargs);
766 /* load is_float_ret */
767 arm_ldrx (code, ARMREG_R11, ARMREG_IP0, MONO_STRUCT_OFFSET (InterpMethodArguments, is_float_ret));
769 /* check if a float return value is expected */
770 arm_cmpx_imm (code, ARMREG_R11, 0);
771 label_is_float_ret = code;
772 arm_bcc (code, ARMCOND_NE, 0);
776 arm_ldrx (code, ARMREG_R11, ARMREG_IP0, MONO_STRUCT_OFFSET (InterpMethodArguments, retval));
778 arm_cmpx_imm (code, ARMREG_R11, 0);
779 label_leave_tramp [0] = code;
780 arm_bcc (code, ARMCOND_EQ, 0);
782 /* store greg result */
783 arm_strx (code, ARMREG_R0, ARMREG_R11, 0);
785 label_leave_tramp [1] = code;
786 arm_bcc (code, ARMCOND_AL, 0);
789 mono_arm_patch (label_is_float_ret, code, MONO_R_ARM64_BCC);
791 arm_ldrx (code, ARMREG_R11, ARMREG_IP0, MONO_STRUCT_OFFSET (InterpMethodArguments, retval));
793 arm_cmpx_imm (code, ARMREG_R11, 0);
794 label_leave_tramp [2] = code;
795 arm_bcc (code, ARMCOND_EQ, 0);
797 /* store freg result */
798 arm_strfpx (code, ARMREG_D0, ARMREG_R11, 0);
800 for (i = 0; i < 3; i++)
801 mono_arm_patch (label_leave_tramp [i], code, MONO_R_ARM64_BCC);
803 arm_movspx (code, ARMREG_SP, ARMREG_FP);
804 arm_ldpx (code, ARMREG_FP, ARMREG_LR, ARMREG_SP, 0);
805 arm_addx_imm (code, ARMREG_SP, ARMREG_SP, framesize);
806 arm_retx (code, ARMREG_LR);
808 g_assert (code - start < buf_len);
810 mono_arch_flush_icache (start, code - start);
811 MONO_PROFILER_RAISE (jit_code_buffer, (start, code - start, MONO_PROFILER_CODE_BUFFER_EXCEPTION_HANDLING, NULL));
814 *info = mono_tramp_info_create ("enter_icall_trampoline", start, code - start, ji, unwind_ops);
818 g_assert_not_reached ();
820 #endif /* ENABLE_INTERPRETER */
823 #else /* DISABLE_JIT */
826 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
828 g_assert_not_reached ();
833 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
835 g_assert_not_reached ();
840 mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
842 g_assert_not_reached ();
847 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
849 g_assert_not_reached ();
854 mono_arch_get_static_rgctx_trampoline (gpointer arg, gpointer addr)
856 g_assert_not_reached ();
861 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
863 g_assert_not_reached ();
868 mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
870 g_assert_not_reached ();
875 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
877 g_assert_not_reached ();
882 mono_arch_get_enter_icall_trampoline (MonoTrampInfo **info)
884 g_assert_not_reached ();
887 #endif /* !DISABLE_JIT */