2 * tramp-arm.c: JIT trampoline code for ARM
5 * Paolo Molaro (lupus@ximian.com)
7 * (C) 2001-2003 Ximian, Inc.
8 * Copyright 2003-2011 Novell Inc
9 * Copyright 2011 Xamarin Inc
10 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
16 #include <mono/metadata/abi-details.h>
17 #include <mono/metadata/appdomain.h>
18 #include <mono/metadata/marshal.h>
19 #include <mono/metadata/tabledefs.h>
20 #include <mono/metadata/profiler-private.h>
21 #include <mono/arch/arm/arm-codegen.h>
22 #include <mono/arch/arm/arm-vfp-codegen.h>
26 #include "debugger-agent.h"
27 #include "jit-icalls.h"
29 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
31 #ifdef USE_JUMP_TABLES
34 decode_imm16 (guint32 insn)
36 return (((insn >> 16) & 0xf) << 12) | (insn & 0xfff);
39 #define INSN_MASK 0xff00000
40 #define MOVW_MASK ((3 << 24) | (0 << 20))
41 #define MOVT_MASK ((3 << 24) | (4 << 20))
44 mono_arch_jumptable_entry_from_code (guint8 *code)
46 guint32 insn1 = ((guint32*)code) [0];
47 guint32 insn2 = ((guint32*)code) [1];
49 if (((insn1 & INSN_MASK) == MOVW_MASK) &&
50 ((insn2 & INSN_MASK) == MOVT_MASK) ) {
51 guint32 imm_lo = decode_imm16 (insn1);
52 guint32 imm_hi = decode_imm16 (insn2);
53 return (gpointer*) GUINT_TO_POINTER (imm_lo | (imm_hi << 16));
55 g_assert_not_reached ();
65 mono_arch_patch_callsite (guint8 *method_start, guint8 *code_ptr, guint8 *addr)
69 * code_ptr is 4 instructions after MOVW/MOVT used to address
72 jte = mono_jumptable_get_entry (code_ptr - 16);
73 g_assert ( jte != NULL);
78 mono_arch_patch_callsite (guint8 *method_start, guint8 *code_ptr, guint8 *addr)
80 guint32 *code = (guint32*)code_ptr;
82 /* This is the 'bl' or the 'mov pc' instruction */
86 * Note that methods are called also with the bl opcode.
88 if ((((*code) >> 25) & 7) == 5) {
89 /*g_print ("direct patching\n");*/
90 arm_patch ((guint8*)code, addr);
91 mono_arch_flush_icache ((guint8*)code, 4);
95 if ((((*code) >> 20) & 0xFF) == 0x12) {
96 /*g_print ("patching bx\n");*/
97 arm_patch ((guint8*)code, addr);
98 mono_arch_flush_icache ((guint8*)(code - 2), 4);
102 g_assert_not_reached ();
107 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
111 /* Patch the jump table entry used by the plt entry */
112 if (*(guint32*)code == 0xe59fc000) {
113 /* ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0); */
114 guint32 offset = ((guint32*)code)[2];
116 jump_entry = code + offset + 12;
117 } else if (*(guint16*)(code - 4) == 0xf8df) {
119 * Thumb PLT entry, begins with ldr.w ip, [pc, #8], code points to entry + 4, see
120 * mono_arm_get_thumb_plt_entry ().
125 offset = *(guint32*)(code + 12);
126 jump_entry = code + offset + 8;
128 g_assert_not_reached ();
131 *(guint8**)jump_entry = addr;
136 #define arm_is_imm12(v) ((int)(v) > -4096 && (int)(v) < 4096)
138 #ifndef USE_JUMP_TABLES
140 * Return the instruction to jump from code to target, 0 if not
141 * reachable with a single instruction
144 branch_for_target_reachable (guint8 *branch, guint8 *target)
146 gint diff = target - branch - 8;
147 g_assert ((diff & 3) == 0);
149 if (diff <= 33554431)
150 return (ARMCOND_AL << ARMCOND_SHIFT) | (ARM_BR_TAG) | (diff >> 2);
152 /* diff between 0 and -33554432 */
153 if (diff >= -33554432)
154 return (ARMCOND_AL << ARMCOND_SHIFT) | (ARM_BR_TAG) | ((diff >> 2) & ~0xff000000);
160 static inline guint8*
161 emit_bx (guint8* code, int reg)
163 if (mono_arm_thumb_supported ())
166 ARM_MOV_REG_REG (code, ARMREG_PC, reg);
170 /* Stack size for trampoline function
172 #define STACK ALIGN_TO (sizeof (MonoLMF), MONO_ARCH_FRAME_ALIGNMENT)
174 /* Method-specific trampoline code fragment size */
175 #define METHOD_TRAMPOLINE_SIZE 64
177 /* Jump-specific trampoline code fragment size */
178 #define JUMP_TRAMPOLINE_SIZE 64
181 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
184 guint8 *buf, *code = NULL;
185 #ifdef USE_JUMP_TABLES
186 gpointer *load_get_lmf_addr = NULL, *load_trampoline = NULL;
188 guint8 *load_get_lmf_addr = NULL, *load_trampoline = NULL;
191 int i, cfa_offset, regsave_size, lr_offset;
192 GSList *unwind_ops = NULL;
193 MonoJumpInfo *ji = NULL;
196 #ifdef USE_JUMP_TABLES
200 /* Now we'll create in 'buf' the ARM trampoline code. This
201 is the trampoline code common to all methods */
205 /* Add space for saving/restoring VFP regs. */
206 if (mono_arm_is_hard_float ())
209 code = buf = mono_global_codeman_reserve (buf_len);
212 * At this point lr points to the specific arg and sp points to the saved
213 * regs on the stack (all but PC and SP). The original LR value has been
214 * saved as sp + LR_OFFSET by the push in the specific trampoline
217 /* The size of the area already allocated by the push in the specific trampoline */
218 regsave_size = 14 * sizeof (mgreg_t);
219 /* The offset where lr was saved inside the regsave area */
220 lr_offset = 13 * sizeof (mgreg_t);
222 // CFA = SP + (num registers pushed) * 4
223 cfa_offset = 14 * sizeof (mgreg_t);
224 mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, cfa_offset);
225 // PC saved at sp+LR_OFFSET
226 mono_add_unwind_op_offset (unwind_ops, code, buf, ARMREG_LR, -4);
227 /* Callee saved regs */
228 for (i = 0; i < 8; ++i)
229 mono_add_unwind_op_offset (unwind_ops, code, buf, ARMREG_R4 + i, -regsave_size + ((4 + i) * 4));
233 * For page trampolines the data is in r1, so just move it, otherwise use the got slot as below.
234 * The trampoline contains a pc-relative offset to the got slot
235 * preceeding the got slot where the value is stored. The offset can be
238 /* See if emit_trampolines () in aot-compiler.c for the '2' */
240 ARM_MOV_REG_REG (code, ARMREG_V2, ARMREG_R1);
242 ARM_LDR_IMM (code, ARMREG_V2, ARMREG_LR, 0);
243 ARM_ADD_REG_IMM (code, ARMREG_V2, ARMREG_V2, 4, 0);
244 ARM_LDR_REG_REG (code, ARMREG_V2, ARMREG_V2, ARMREG_LR);
247 ARM_LDR_IMM (code, ARMREG_V2, ARMREG_LR, 0);
249 ARM_LDR_IMM (code, ARMREG_V3, ARMREG_SP, lr_offset);
251 /* we build the MonoLMF structure on the stack - see mini-arm.h
252 * The pointer to the struct is put in r1.
253 * the iregs array is already allocated on the stack by push.
255 code = mono_arm_emit_load_imm (code, ARMREG_R2, STACK - regsave_size);
256 ARM_SUB_REG_REG (code, ARMREG_SP, ARMREG_SP, ARMREG_R2);
257 cfa_offset += STACK - regsave_size;
258 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, cfa_offset);
260 code = mono_arm_emit_load_imm (code, ARMREG_R2, STACK - sizeof (MonoLMF));
261 ARM_ADD_REG_REG (code, ARMREG_V1, ARMREG_SP, ARMREG_R2);
263 /* ok, now we can continue with the MonoLMF setup, mostly untouched
264 * from emit_prolog in mini-arm.c
265 * This is a synthetized call to mono_get_lmf_addr ()
268 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
269 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_PC, 0);
271 *(gpointer*)code = NULL;
273 ARM_LDR_REG_REG (code, ARMREG_R0, ARMREG_PC, ARMREG_R0);
275 #ifdef USE_JUMP_TABLES
276 load_get_lmf_addr = mono_jumptable_add_entry ();
277 code = mono_arm_load_jumptable_entry (code, load_get_lmf_addr, ARMREG_R0);
279 load_get_lmf_addr = code;
283 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
284 code = emit_bx (code, ARMREG_R0);
287 * The stack now looks like:
289 * v1 -> <rest of LMF>
293 /* r0 is the result from mono_get_lmf_addr () */
294 ARM_STR_IMM (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
295 /* new_lmf->previous_lmf = *lmf_addr */
296 ARM_LDR_IMM (code, ARMREG_R2, ARMREG_R0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
297 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
298 /* *(lmf_addr) = r1 */
299 ARM_STR_IMM (code, ARMREG_V1, ARMREG_R0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
300 /* save method info (it's in v2) */
301 if ((tramp_type == MONO_TRAMPOLINE_JIT) || (tramp_type == MONO_TRAMPOLINE_JUMP))
302 ARM_STR_IMM (code, ARMREG_V2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, method));
304 ARM_MOV_REG_IMM8 (code, ARMREG_R2, 0);
305 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, method));
308 code = mono_arm_emit_load_imm (code, ARMREG_R2, cfa_offset);
309 ARM_ADD_REG_REG (code, ARMREG_R2, ARMREG_SP, ARMREG_R2);
310 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, sp));
312 ARM_LDR_IMM (code, ARMREG_R2, ARMREG_V1, (MONO_STRUCT_OFFSET (MonoLMF, iregs) + ARMREG_FP*4));
313 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, fp));
314 /* save the IP (caller ip) */
315 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
316 ARM_MOV_REG_IMM8 (code, ARMREG_R2, 0);
318 ARM_LDR_IMM (code, ARMREG_R2, ARMREG_V1, (MONO_STRUCT_OFFSET (MonoLMF, iregs) + 13*4));
320 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, ip));
322 /* Save VFP registers. */
323 if (mono_arm_is_hard_float ()) {
325 * Strictly speaking, we don't have to save d0-d7 in the LMF, but
326 * it's easier than attempting to store them on the stack since
327 * this trampoline code is pretty messy.
329 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, fregs));
330 ARM_FSTMD (code, ARM_VFP_D0, 8, ARMREG_R0);
334 * Now we're ready to call xxx_trampoline ().
336 /* Arg 1: the saved registers */
337 ARM_ADD_REG_IMM (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, iregs), 0);
339 /* Arg 2: code (next address to the instruction that called us) */
340 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
341 ARM_MOV_REG_IMM8 (code, ARMREG_R1, 0);
343 ARM_MOV_REG_REG (code, ARMREG_R1, ARMREG_V3);
346 /* Arg 3: the specific argument, stored in v2
348 ARM_MOV_REG_REG (code, ARMREG_R2, ARMREG_V2);
351 char *icall_name = g_strdup_printf ("trampoline_func_%d", tramp_type);
352 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, icall_name);
353 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
355 *(gpointer*)code = NULL;
357 ARM_LDR_REG_REG (code, ARMREG_IP, ARMREG_PC, ARMREG_IP);
359 #ifdef USE_JUMP_TABLES
360 load_trampoline = mono_jumptable_add_entry ();
361 code = mono_arm_load_jumptable_entry (code, load_trampoline, ARMREG_IP);
363 load_trampoline = code;
368 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
369 code = emit_bx (code, ARMREG_IP);
371 /* OK, code address is now on r0. Move it to the place on the stack
372 * where IP was saved (it is now no more useful to us and it can be
373 * clobbered). This way we can just restore all the regs in one inst
376 ARM_STR_IMM (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, iregs) + (ARMREG_R12 * sizeof (mgreg_t)));
378 /* Check for thread interruption */
379 /* This is not perf critical code so no need to check the interrupt flag */
381 * Have to call the _force_ variant, since there could be a protected wrapper on the top of the stack.
384 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_interruption_checkpoint_from_trampoline");
385 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
387 *(gpointer*)code = NULL;
389 ARM_LDR_REG_REG (code, ARMREG_IP, ARMREG_PC, ARMREG_IP);
391 #ifdef USE_JUMP_TABLES
392 gpointer *jte = mono_jumptable_add_entry ();
393 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_IP);
394 jte [0] = mono_interruption_checkpoint_from_trampoline;
396 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
398 *(gpointer*)code = mono_interruption_checkpoint_from_trampoline;
402 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
403 code = emit_bx (code, ARMREG_IP);
406 * Now we restore the MonoLMF (see emit_epilogue in mini-arm.c)
407 * and the rest of the registers, so the method called will see
408 * the same state as before we executed.
410 /* ip = previous_lmf */
411 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
413 ARM_LDR_IMM (code, ARMREG_LR, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
414 /* *(lmf_addr) = previous_lmf */
415 ARM_STR_IMM (code, ARMREG_IP, ARMREG_LR, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
417 /* Restore VFP registers. */
418 if (mono_arm_is_hard_float ()) {
419 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, fregs));
420 ARM_FLDMD (code, ARM_VFP_D0, 8, ARMREG_R0);
423 /* Non-standard function epilogue. Instead of doing a proper
424 * return, we just jump to the compiled code.
426 /* Restore the registers and jump to the code:
427 * Note that IP has been conveniently set to the method addr.
429 ARM_ADD_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, STACK - regsave_size);
430 cfa_offset -= STACK - regsave_size;
431 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, cfa_offset);
432 ARM_POP_NWB (code, 0x5fff);
433 mono_add_unwind_op_same_value (unwind_ops, code, buf, ARMREG_LR);
434 if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
435 ARM_MOV_REG_REG (code, ARMREG_R0, ARMREG_IP);
436 ARM_ADD_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, regsave_size);
437 cfa_offset -= regsave_size;
438 g_assert (cfa_offset == 0);
439 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, cfa_offset);
440 if (MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type))
441 code = emit_bx (code, ARMREG_LR);
443 code = emit_bx (code, ARMREG_IP);
445 #ifdef USE_JUMP_TABLES
446 load_get_lmf_addr [0] = mono_get_lmf_addr;
447 load_trampoline [0] = (gpointer)mono_get_trampoline_func (tramp_type);
449 constants = (gpointer*)code;
450 constants [0] = mono_get_lmf_addr;
451 constants [1] = (gpointer)mono_get_trampoline_func (tramp_type);
454 /* backpatch by emitting the missing instructions skipped above */
455 ARM_LDR_IMM (load_get_lmf_addr, ARMREG_R0, ARMREG_PC, (code - load_get_lmf_addr - 8));
456 ARM_LDR_IMM (load_trampoline, ARMREG_IP, ARMREG_PC, (code + 4 - load_trampoline - 8));
462 /* Flush instruction cache, since we've generated code */
463 mono_arch_flush_icache (buf, code - buf);
464 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
467 g_assert ((code - buf) <= buf_len);
470 tramp_name = mono_get_generic_trampoline_name (tramp_type);
471 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
477 #define SPEC_TRAMP_SIZE 24
480 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
482 guint8 *code, *buf, *tramp;
484 #ifndef USE_JUMP_TABLES
485 guint32 short_branch = FALSE;
487 guint32 size = SPEC_TRAMP_SIZE;
489 tramp = mono_get_trampoline_code (tramp_type);
492 mono_domain_lock (domain);
493 #ifdef USE_JUMP_TABLES
494 code = buf = mono_domain_code_reserve_align (domain, size, 4);
496 code = buf = mono_domain_code_reserve_align (domain, size, 4);
497 if ((short_branch = branch_for_target_reachable (code + 4, tramp))) {
499 mono_domain_code_commit (domain, code, SPEC_TRAMP_SIZE, size);
502 mono_domain_unlock (domain);
504 code = buf = mono_global_codeman_reserve (size);
505 short_branch = FALSE;
508 #ifdef USE_JUMP_TABLES
509 /* For jumptables case we always generate the same code for trampolines,
511 * push {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, lr}
517 ARM_PUSH (code, 0x5fff);
518 constants = mono_jumptable_add_entries (2);
519 code = mono_arm_load_jumptable_entry_addr (code, constants, ARMREG_LR);
520 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_LR, 4);
521 code = emit_bx (code, ARMREG_R1);
522 constants [0] = arg1;
523 constants [1] = tramp;
525 /* we could reduce this to 12 bytes if tramp is within reach:
529 * The called code can access method using the lr register
530 * A 20 byte sequence could be:
532 * ARM_MOV_REG_REG (lr, pc)
533 * ARM_LDR_IMM (pc, pc, 0)
537 /* We save all the registers, except PC and SP */
538 ARM_PUSH (code, 0x5fff);
540 constants = (gpointer*)code;
541 constants [0] = GUINT_TO_POINTER (short_branch | (1 << 24));
542 constants [1] = arg1;
545 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 8); /* temp reg */
546 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
547 code = emit_bx (code, ARMREG_R1);
549 constants = (gpointer*)code;
550 constants [0] = arg1;
551 constants [1] = tramp;
556 /* Flush instruction cache, since we've generated code */
557 mono_arch_flush_icache (buf, code - buf);
558 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_SPECIFIC_TRAMPOLINE, mono_get_generic_trampoline_simple_name (tramp_type));
560 g_assert ((code - buf) <= size);
563 *code_len = code - buf;
569 * mono_arch_get_unbox_trampoline:
571 * @addr: pointer to native code for @m
573 * when value type methods are called through the vtable we need to unbox the
574 * this argument. This method returns a pointer to a trampoline which does
575 * unboxing before calling the method
578 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
580 guint8 *code, *start;
581 MonoDomain *domain = mono_domain_get ();
583 #ifdef USE_JUMP_TABLES
590 start = code = mono_domain_code_reserve (domain, size);
592 unwind_ops = mono_arch_get_cie_program ();
594 #ifdef USE_JUMP_TABLES
595 jte = mono_jumptable_add_entry ();
596 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_IP);
597 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_R0, sizeof (MonoObject));
598 code = emit_bx (code, ARMREG_IP);
601 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 4);
602 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_R0, sizeof (MonoObject));
603 code = emit_bx (code, ARMREG_IP);
604 *(guint32*)code = (guint32)addr;
607 mono_arch_flush_icache (start, code - start);
608 mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_UNBOX_TRAMPOLINE, m);
609 g_assert ((code - start) <= size);
610 /*g_print ("unbox trampoline at %d for %s:%s\n", this_pos, m->klass->name, m->name);
611 g_print ("unbox code is at %p for method at %p\n", start, addr);*/
613 mono_tramp_info_register (mono_tramp_info_create (NULL, start, code - start, NULL, unwind_ops), domain);
619 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
621 guint8 *code, *start;
623 #ifdef USE_JUMP_TABLES
629 MonoDomain *domain = mono_domain_get ();
631 start = code = mono_domain_code_reserve (domain, buf_len);
633 unwind_ops = mono_arch_get_cie_program ();
635 #ifdef USE_JUMP_TABLES
636 jte = mono_jumptable_add_entries (2);
637 code = mono_arm_load_jumptable_entry_addr (code, jte, ARMREG_IP);
638 ARM_LDR_IMM (code, MONO_ARCH_RGCTX_REG, ARMREG_IP, 0);
639 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_IP, 4);
640 ARM_BX (code, ARMREG_IP);
644 ARM_LDR_IMM (code, MONO_ARCH_RGCTX_REG, ARMREG_PC, 0);
645 ARM_LDR_IMM (code, ARMREG_PC, ARMREG_PC, 0);
646 *(guint32*)code = (guint32)mrgctx;
648 *(guint32*)code = (guint32)addr;
652 g_assert ((code - start) <= buf_len);
654 mono_arch_flush_icache (start, code - start);
655 mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
657 mono_tramp_info_register (mono_tramp_info_create (NULL, start, code - start, NULL, unwind_ops), domain);
663 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
669 guint8 **rgctx_null_jumps;
673 MonoJumpInfo *ji = NULL;
674 GSList *unwind_ops = NULL;
675 #ifdef USE_JUMP_TABLES
679 mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
680 index = MONO_RGCTX_SLOT_INDEX (slot);
682 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
683 for (depth = 0; ; ++depth) {
684 int size = mono_class_rgctx_get_array_size (depth, mrgctx);
686 if (index < size - 1)
691 tramp_size = 64 + 16 * depth;
693 code = buf = mono_global_codeman_reserve (tramp_size);
695 unwind_ops = mono_arch_get_cie_program ();
697 rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
700 /* The vtable/mrgctx is in R0 */
701 g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
705 ARM_MOV_REG_REG (code, ARMREG_R1, ARMREG_R0);
707 /* load rgctx ptr from vtable */
708 g_assert (arm_is_imm12 (MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context)));
709 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R0, MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context));
710 /* is the rgctx ptr null? */
711 ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
712 /* if yes, jump to actual trampoline */
713 rgctx_null_jumps [njumps ++] = code;
714 ARM_B_COND (code, ARMCOND_EQ, 0);
717 for (i = 0; i < depth; ++i) {
718 /* load ptr to next array */
719 if (mrgctx && i == 0) {
720 g_assert (arm_is_imm12 (MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT));
721 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R1, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT);
723 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R1, 0);
725 /* is the ptr null? */
726 ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
727 /* if yes, jump to actual trampoline */
728 rgctx_null_jumps [njumps ++] = code;
729 ARM_B_COND (code, ARMCOND_EQ, 0);
733 code = mono_arm_emit_load_imm (code, ARMREG_R2, sizeof (gpointer) * (index + 1));
734 ARM_LDR_REG_REG (code, ARMREG_R1, ARMREG_R1, ARMREG_R2);
735 /* is the slot null? */
736 ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
737 /* if yes, jump to actual trampoline */
738 rgctx_null_jumps [njumps ++] = code;
739 ARM_B_COND (code, ARMCOND_EQ, 0);
740 /* otherwise return, result is in R1 */
741 ARM_MOV_REG_REG (code, ARMREG_R0, ARMREG_R1);
742 code = emit_bx (code, ARMREG_LR);
744 g_assert (njumps <= depth + 2);
745 for (i = 0; i < njumps; ++i)
746 arm_patch (rgctx_null_jumps [i], code);
748 g_free (rgctx_null_jumps);
752 /* The vtable/mrgctx is still in R0 */
755 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
756 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 0);
758 *(gpointer*)code = NULL;
760 ARM_LDR_REG_REG (code, ARMREG_PC, ARMREG_PC, ARMREG_R1);
762 tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), &code_len);
764 /* Jump to the actual trampoline */
765 #ifdef USE_JUMP_TABLES
766 jte = mono_jumptable_add_entry ();
768 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_R1);
769 code = emit_bx (code, ARMREG_R1);
771 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 0); /* temp reg */
772 code = emit_bx (code, ARMREG_R1);
773 *(gpointer*)code = tramp;
778 mono_arch_flush_icache (buf, code - buf);
779 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
781 g_assert (code - buf <= tramp_size);
783 char *name = mono_get_rgctx_fetch_trampoline_name (slot);
784 *info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);
791 mono_arch_create_general_rgctx_lazy_fetch_trampoline (MonoTrampInfo **info, gboolean aot)
795 MonoJumpInfo *ji = NULL;
796 GSList *unwind_ops = NULL;
802 code = buf = mono_global_codeman_reserve (tramp_size);
804 unwind_ops = mono_arch_get_cie_program ();
806 // FIXME: Currently, we always go to the slow path.
807 /* Load trampoline addr */
808 ARM_LDR_IMM (code, ARMREG_R1, MONO_ARCH_RGCTX_REG, 4);
809 /* The vtable/mrgctx is in R0 */
810 g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
811 code = emit_bx (code, ARMREG_R1);
813 mono_arch_flush_icache (buf, code - buf);
814 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
816 g_assert (code - buf <= tramp_size);
818 *info = mono_tramp_info_create ("rgctx_fetch_trampoline_general", buf, code - buf, ji, unwind_ops);
824 handler_block_trampoline_helper (gpointer *ptr)
826 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
827 return jit_tls->handler_block_return_address;
831 mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
836 MonoJumpInfo *ji = NULL;
837 GSList *unwind_ops = NULL;
841 code = buf = mono_global_codeman_reserve (tramp_size);
843 unwind_ops = mono_arch_get_cie_program ();
845 tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD, NULL, NULL);
848 This trampoline restore the call chain of the handler block then jumps into the code that deals with it.
852 * We are in a method frame after the call emitted by OP_CALL_HANDLER.
854 /* Obtain jit_tls->handler_block_return_address */
855 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_PC, 0);
857 *(gpointer*)code = handler_block_trampoline_helper;
860 /* Set it as the return address so the trampoline will return to it */
861 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_R0);
863 /* Call the trampoline */
864 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_PC, 0);
865 code = emit_bx (code, ARMREG_R0);
866 *(gpointer*)code = tramp;
869 mono_arch_flush_icache (buf, code - buf);
870 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
871 g_assert (code - buf <= tramp_size);
873 *info = mono_tramp_info_create ("handler_block_trampoline", buf, code - buf, ji, unwind_ops);
879 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
882 GSList *unwind_ops = NULL;
883 MonoJumpInfo *ji = NULL;
886 buf = code = mono_global_codeman_reserve (96);
889 * Construct the MonoContext structure on the stack.
892 frame_size = sizeof (MonoContext);
893 frame_size = ALIGN_TO (frame_size, MONO_ARCH_FRAME_ALIGNMENT);
894 ARM_SUB_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, frame_size);
896 /* save ip, lr and pc into their correspodings ctx.regs slots. */
897 ARM_STR_IMM (code, ARMREG_IP, ARMREG_SP, MONO_STRUCT_OFFSET (MonoContext, regs) + sizeof (mgreg_t) * ARMREG_IP);
898 ARM_STR_IMM (code, ARMREG_LR, ARMREG_SP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_LR);
899 ARM_STR_IMM (code, ARMREG_LR, ARMREG_SP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_PC);
901 /* save r0..r10 and fp */
902 ARM_ADD_REG_IMM8 (code, ARMREG_IP, ARMREG_SP, MONO_STRUCT_OFFSET (MonoContext, regs));
903 ARM_STM (code, ARMREG_IP, 0x0fff);
905 /* now we can update fp. */
906 ARM_MOV_REG_REG (code, ARMREG_FP, ARMREG_SP);
908 /* make ctx.esp hold the actual value of sp at the beginning of this method. */
909 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_FP, frame_size);
910 ARM_STR_IMM (code, ARMREG_R0, ARMREG_IP, 4 * ARMREG_SP);
911 ARM_STR_IMM (code, ARMREG_R0, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_SP);
913 /* make ctx.eip hold the address of the call. */
914 //ARM_SUB_REG_IMM8 (code, ARMREG_LR, ARMREG_LR, 4);
915 ARM_STR_IMM (code, ARMREG_LR, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, pc));
917 /* r0 now points to the MonoContext */
918 ARM_MOV_REG_REG (code, ARMREG_R0, ARMREG_FP);
922 #ifdef USE_JUMP_TABLES
924 gpointer *jte = mono_jumptable_add_entry ();
925 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_IP);
929 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
932 *(gpointer*)code = debugger_agent_single_step_from_context;
934 *(gpointer*)code = debugger_agent_breakpoint_from_context;
937 ARM_BLX_REG (code, ARMREG_IP);
939 /* we're back; save ctx.eip and ctx.esp into the corresponding regs slots. */
940 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, pc));
941 ARM_STR_IMM (code, ARMREG_R0, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_LR);
942 ARM_STR_IMM (code, ARMREG_R0, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_PC);
944 /* make ip point to the regs array, then restore everything, including pc. */
945 ARM_ADD_REG_IMM8 (code, ARMREG_IP, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, regs));
946 ARM_LDM (code, ARMREG_IP, 0xffff);
948 mono_arch_flush_icache (buf, code - buf);
949 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
951 const char *tramp_name = single_step ? "sdb_single_step_trampoline" : "sdb_breakpoint_trampoline";
952 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
960 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
962 g_assert_not_reached ();
967 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
969 g_assert_not_reached ();
974 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
976 g_assert_not_reached ();
981 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
983 g_assert_not_reached ();
988 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
990 g_assert_not_reached ();
995 mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
997 g_assert_not_reached ();
1002 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
1004 g_assert_not_reached ();
1008 #endif /* DISABLE_JIT */
1011 mono_arch_get_call_target (guint8 *code)
1013 guint32 ins = ((guint32*)(gpointer)code) [-1];
1016 /* Should be a 'bl' or a 'b' */
1017 if (((ins >> 25) & 0x7) == 0x5) {
1019 /* Should be a 'bl' */
1020 if ((((ins >> 25) & 0x7) == 0x5) && (((ins >> 24) & 0x1) == 0x1)) {
1022 gint32 disp = ((((gint32)ins) & 0xffffff) << 8) >> 8;
1023 guint8 *target = code - 4 + 8 + (disp * 4);
1032 mono_arch_get_plt_info_offset (guint8 *plt_entry, mgreg_t *regs, guint8 *code)
1034 /* The offset is stored as the 4th word of the plt entry */
1035 return ((guint32*)plt_entry) [3];
1039 * Return the address of the PLT entry called by the thumb code CODE.
1042 mono_arm_get_thumb_plt_entry (guint8 *code)
1044 int s, j1, j2, imm10, imm11, i1, i2, imm32;
1049 /* code should be right after a BL */
1050 code = (guint8*)((mgreg_t)code & ~1);
1051 base = (guint8*)((mgreg_t)code & ~3);
1053 t1 = ((guint16*)bl) [0];
1054 t2 = ((guint16*)bl) [1];
1056 g_assert ((t1 >> 11) == 0x1e);
1058 s = (t1 >> 10) & 0x1;
1059 imm10 = (t1 >> 0) & 0x3ff;
1060 j1 = (t2 >> 13) & 0x1;
1061 j2 = (t2 >> 11) & 0x1;
1064 i1 = (s ^ j1) ? 0 : 1;
1065 i2 = (s ^ j2) ? 0 : 1;
1067 imm32 = (imm11 << 1) | (imm10 << 12) | (i2 << 22) | (i1 << 23);
1069 /* Sign extend from 24 bits to 32 bits */
1070 imm32 = ((gint32)imm32 << 8) >> 8;
1072 target = code + imm32;
1074 /* target now points to the thumb plt entry */
1075 /* ldr.w r12, [pc, #8] */
1076 g_assert (((guint16*)target) [0] == 0xf8df);
1077 g_assert (((guint16*)target) [1] == 0xc008);
1080 * The PLT info offset is at offset 16, but mono_arch_get_plt_entry_offset () returns
1081 * the 3rd word, so compensate by returning a different value.
1091 * mono_arch_get_gsharedvt_arg_trampoline:
1093 * See tramp-x86.c for documentation.
1096 mono_arch_get_gsharedvt_arg_trampoline (MonoDomain *domain, gpointer arg, gpointer addr)
1100 gpointer *constants;
1104 buf = code = mono_domain_code_reserve (domain, buf_len);
1106 /* Similar to the specialized trampoline code */
1107 ARM_PUSH (code, (1 << ARMREG_R0) | (1 << ARMREG_R1) | (1 << ARMREG_R2) | (1 << ARMREG_R3) | (1 << ARMREG_LR));
1108 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 8);
1109 /* arg is passed in LR */
1110 ARM_LDR_IMM (code, ARMREG_LR, ARMREG_PC, 0);
1111 code = emit_bx (code, ARMREG_IP);
1112 constants = (gpointer*)code;
1113 constants [0] = arg;
1114 constants [1] = addr;
1117 g_assert ((code - buf) <= buf_len);
1119 nacl_domain_code_validate (domain, &buf, buf_len, &code);
1120 mono_arch_flush_icache (buf, code - buf);
1121 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
1123 mono_tramp_info_register (mono_tramp_info_create (NULL, buf, code - buf, NULL, NULL), domain);
1131 mono_arch_get_gsharedvt_arg_trampoline (MonoDomain *domain, gpointer arg, gpointer addr)
1133 g_assert_not_reached ();