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
15 #include <mono/metadata/abi-details.h>
16 #include <mono/metadata/appdomain.h>
17 #include <mono/metadata/marshal.h>
18 #include <mono/metadata/tabledefs.h>
19 #include <mono/metadata/profiler-private.h>
20 #include <mono/arch/arm/arm-codegen.h>
21 #include <mono/arch/arm/arm-vfp-codegen.h>
25 #include "debugger-agent.h"
27 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
29 #ifdef USE_JUMP_TABLES
32 decode_imm16 (guint32 insn)
34 return (((insn >> 16) & 0xf) << 12) | (insn & 0xfff);
37 #define INSN_MASK 0xff00000
38 #define MOVW_MASK ((3 << 24) | (0 << 20))
39 #define MOVT_MASK ((3 << 24) | (4 << 20))
42 mono_arch_jumptable_entry_from_code (guint8 *code)
44 guint32 insn1 = ((guint32*)code) [0];
45 guint32 insn2 = ((guint32*)code) [1];
47 if (((insn1 & INSN_MASK) == MOVW_MASK) &&
48 ((insn2 & INSN_MASK) == MOVT_MASK) ) {
49 guint32 imm_lo = decode_imm16 (insn1);
50 guint32 imm_hi = decode_imm16 (insn2);
51 return (gpointer*) GUINT_TO_POINTER (imm_lo | (imm_hi << 16));
53 g_assert_not_reached ();
63 mono_arch_patch_callsite (guint8 *method_start, guint8 *code_ptr, guint8 *addr)
67 * code_ptr is 4 instructions after MOVW/MOVT used to address
70 jte = mono_jumptable_get_entry (code_ptr - 16);
71 g_assert ( jte != NULL);
76 mono_arch_patch_callsite (guint8 *method_start, guint8 *code_ptr, guint8 *addr)
78 guint32 *code = (guint32*)code_ptr;
80 /* This is the 'bl' or the 'mov pc' instruction */
84 * Note that methods are called also with the bl opcode.
86 if ((((*code) >> 25) & 7) == 5) {
87 /*g_print ("direct patching\n");*/
88 arm_patch ((guint8*)code, addr);
89 mono_arch_flush_icache ((guint8*)code, 4);
93 if ((((*code) >> 20) & 0xFF) == 0x12) {
94 /*g_print ("patching bx\n");*/
95 arm_patch ((guint8*)code, addr);
96 mono_arch_flush_icache ((guint8*)(code - 2), 4);
100 g_assert_not_reached ();
105 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
109 /* Patch the jump table entry used by the plt entry */
110 if (*(guint32*)code == 0xe59fc000) {
111 /* ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0); */
112 guint32 offset = ((guint32*)code)[2];
114 jump_entry = code + offset + 12;
115 } else if (*(guint16*)(code - 4) == 0xf8df) {
117 * Thumb PLT entry, begins with ldr.w ip, [pc, #8], code points to entry + 4, see
118 * mono_arm_get_thumb_plt_entry ().
123 offset = *(guint32*)(code + 12);
124 jump_entry = code + offset + 8;
126 g_assert_not_reached ();
129 *(guint8**)jump_entry = addr;
133 mono_arch_nullify_class_init_trampoline (guint8 *code, mgreg_t *regs)
135 mono_arch_patch_callsite (NULL, code, mini_get_nullified_class_init_trampoline ());
140 #define arm_is_imm12(v) ((int)(v) > -4096 && (int)(v) < 4096)
142 #ifndef USE_JUMP_TABLES
144 * Return the instruction to jump from code to target, 0 if not
145 * reachable with a single instruction
148 branch_for_target_reachable (guint8 *branch, guint8 *target)
150 gint diff = target - branch - 8;
151 g_assert ((diff & 3) == 0);
153 if (diff <= 33554431)
154 return (ARMCOND_AL << ARMCOND_SHIFT) | (ARM_BR_TAG) | (diff >> 2);
156 /* diff between 0 and -33554432 */
157 if (diff >= -33554432)
158 return (ARMCOND_AL << ARMCOND_SHIFT) | (ARM_BR_TAG) | ((diff >> 2) & ~0xff000000);
164 static inline guint8*
165 emit_bx (guint8* code, int reg)
167 if (mono_arm_thumb_supported ())
170 ARM_MOV_REG_REG (code, ARMREG_PC, reg);
174 /* Stack size for trampoline function
176 #define STACK ALIGN_TO (sizeof (MonoLMF), 8)
178 /* Method-specific trampoline code fragment size */
179 #define METHOD_TRAMPOLINE_SIZE 64
181 /* Jump-specific trampoline code fragment size */
182 #define JUMP_TRAMPOLINE_SIZE 64
185 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
188 guint8 *buf, *code = NULL;
189 #ifdef USE_JUMP_TABLES
190 gpointer *load_get_lmf_addr = NULL, *load_trampoline = NULL;
192 guint8 *load_get_lmf_addr = NULL, *load_trampoline = NULL;
196 int cfa_offset, regsave_size, lr_offset;
197 GSList *unwind_ops = NULL;
198 MonoJumpInfo *ji = NULL;
201 #ifdef USE_JUMP_TABLES
205 /* Now we'll create in 'buf' the ARM trampoline code. This
206 is the trampoline code common to all methods */
210 /* Add space for saving/restoring VFP regs. */
211 if (mono_arm_is_hard_float ())
214 code = buf = mono_global_codeman_reserve (buf_len);
217 * At this point lr points to the specific arg and sp points to the saved
218 * regs on the stack (all but PC and SP). The original LR value has been
219 * saved as sp + LR_OFFSET by the push in the specific trampoline
222 /* The size of the area already allocated by the push in the specific trampoline */
223 regsave_size = 14 * sizeof (mgreg_t);
224 /* The offset where lr was saved inside the regsave area */
225 lr_offset = 13 * sizeof (mgreg_t);
227 // FIXME: Finish the unwind info, the current info allows us to unwind
228 // when the trampoline is not in the epilog
230 // CFA = SP + (num registers pushed) * 4
231 cfa_offset = 14 * sizeof (mgreg_t);
232 mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, cfa_offset);
233 // PC saved at sp+LR_OFFSET
234 mono_add_unwind_op_offset (unwind_ops, code, buf, ARMREG_LR, -4);
236 if (aot && tramp_type != MONO_TRAMPOLINE_GENERIC_CLASS_INIT) {
238 * For page trampolines the data is in r1, so just move it, otherwise use the got slot as below.
239 * The trampoline contains a pc-relative offset to the got slot
240 * preceeding the got slot where the value is stored. The offset can be
244 ARM_MOV_REG_REG (code, ARMREG_V2, ARMREG_R1);
246 ARM_LDR_IMM (code, ARMREG_V2, ARMREG_LR, 0);
247 ARM_ADD_REG_IMM (code, ARMREG_V2, ARMREG_V2, 4, 0);
248 ARM_LDR_REG_REG (code, ARMREG_V2, ARMREG_V2, ARMREG_LR);
251 if (tramp_type != MONO_TRAMPOLINE_GENERIC_CLASS_INIT)
252 ARM_LDR_IMM (code, ARMREG_V2, ARMREG_LR, 0);
254 ARM_LDR_IMM (code, ARMREG_V2, ARMREG_SP, 0);
256 ARM_LDR_IMM (code, ARMREG_V3, ARMREG_SP, lr_offset);
258 /* ok, now we can continue with the MonoLMF setup, mostly untouched
259 * from emit_prolog in mini-arm.c
260 * This is a synthetized call to mono_get_lmf_addr ()
263 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
264 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_PC, 0);
266 *(gpointer*)code = NULL;
268 ARM_LDR_REG_REG (code, ARMREG_R0, ARMREG_PC, ARMREG_R0);
270 #ifdef USE_JUMP_TABLES
271 load_get_lmf_addr = mono_jumptable_add_entry ();
272 code = mono_arm_load_jumptable_entry (code, load_get_lmf_addr, ARMREG_R0);
274 load_get_lmf_addr = code;
278 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
279 code = emit_bx (code, ARMREG_R0);
281 /* we build the MonoLMF structure on the stack - see mini-arm.h
282 * The pointer to the struct is put in r1.
283 * the iregs array is already allocated on the stack by push.
285 code = mono_arm_emit_load_imm (code, ARMREG_R2, STACK - regsave_size);
286 ARM_SUB_REG_REG (code, ARMREG_SP, ARMREG_SP, ARMREG_R2);
287 cfa_offset += STACK - regsave_size;
288 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, cfa_offset);
290 code = mono_arm_emit_load_imm (code, ARMREG_R2, STACK - sizeof (MonoLMF));
291 ARM_ADD_REG_REG (code, ARMREG_V1, ARMREG_SP, ARMREG_R2);
294 * The stack now looks like:
296 * v1 -> <rest of LMF>
300 /* r0 is the result from mono_get_lmf_addr () */
301 ARM_STR_IMM (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
302 /* new_lmf->previous_lmf = *lmf_addr */
303 ARM_LDR_IMM (code, ARMREG_R2, ARMREG_R0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
304 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
305 /* *(lmf_addr) = r1 */
306 ARM_STR_IMM (code, ARMREG_V1, ARMREG_R0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
307 /* save method info (it's in v2) */
308 if ((tramp_type == MONO_TRAMPOLINE_JIT) || (tramp_type == MONO_TRAMPOLINE_JUMP))
309 ARM_STR_IMM (code, ARMREG_V2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, method));
311 ARM_MOV_REG_IMM8 (code, ARMREG_R2, 0);
312 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, method));
315 code = mono_arm_emit_load_imm (code, ARMREG_R2, cfa_offset);
316 ARM_ADD_REG_REG (code, ARMREG_R2, ARMREG_SP, ARMREG_R2);
317 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, sp));
319 ARM_LDR_IMM (code, ARMREG_R2, ARMREG_V1, (MONO_STRUCT_OFFSET (MonoLMF, iregs) + ARMREG_FP*4));
320 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, fp));
321 /* save the IP (caller ip) */
322 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
323 ARM_MOV_REG_IMM8 (code, ARMREG_R2, 0);
325 ARM_LDR_IMM (code, ARMREG_R2, ARMREG_V1, (MONO_STRUCT_OFFSET (MonoLMF, iregs) + 13*4));
327 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, ip));
329 /* Save VFP registers. */
330 if (mono_arm_is_hard_float ()) {
332 * Strictly speaking, we don't have to save d0-d7 in the LMF, but
333 * it's easier than attempting to store them on the stack since
334 * this trampoline code is pretty messy.
336 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, fregs));
337 ARM_FSTMD (code, ARM_VFP_D0, 8, ARMREG_R0);
341 * Now we're ready to call xxx_trampoline ().
343 /* Arg 1: the saved registers */
344 ARM_ADD_REG_IMM (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, iregs), 0);
346 /* Arg 2: code (next address to the instruction that called us) */
347 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
348 ARM_MOV_REG_IMM8 (code, ARMREG_R1, 0);
350 ARM_MOV_REG_REG (code, ARMREG_R1, ARMREG_V3);
353 /* Arg 3: the specific argument, stored in v2
355 ARM_MOV_REG_REG (code, ARMREG_R2, ARMREG_V2);
358 char *icall_name = g_strdup_printf ("trampoline_func_%d", tramp_type);
359 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, icall_name);
360 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
362 *(gpointer*)code = NULL;
364 ARM_LDR_REG_REG (code, ARMREG_IP, ARMREG_PC, ARMREG_IP);
366 #ifdef USE_JUMP_TABLES
367 load_trampoline = mono_jumptable_add_entry ();
368 code = mono_arm_load_jumptable_entry (code, load_trampoline, ARMREG_IP);
370 load_trampoline = code;
375 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
376 code = emit_bx (code, ARMREG_IP);
378 /* OK, code address is now on r0. Move it to the place on the stack
379 * where IP was saved (it is now no more useful to us and it can be
380 * clobbered). This way we can just restore all the regs in one inst
383 ARM_STR_IMM (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, iregs) + (ARMREG_R12 * sizeof (mgreg_t)));
385 /* Check for thread interruption */
386 /* This is not perf critical code so no need to check the interrupt flag */
388 * Have to call the _force_ variant, since there could be a protected wrapper on the top of the stack.
391 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_force_interruption_checkpoint");
392 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
394 *(gpointer*)code = NULL;
396 ARM_LDR_REG_REG (code, ARMREG_IP, ARMREG_PC, ARMREG_IP);
398 #ifdef USE_JUMP_TABLES
399 gpointer *jte = mono_jumptable_add_entry ();
400 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_IP);
401 jte [0] = mono_thread_force_interruption_checkpoint;
403 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
405 *(gpointer*)code = mono_thread_force_interruption_checkpoint;
409 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
410 code = emit_bx (code, ARMREG_IP);
413 * Now we restore the MonoLMF (see emit_epilogue in mini-arm.c)
414 * and the rest of the registers, so the method called will see
415 * the same state as before we executed.
417 /* ip = previous_lmf */
418 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
420 ARM_LDR_IMM (code, ARMREG_LR, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
421 /* *(lmf_addr) = previous_lmf */
422 ARM_STR_IMM (code, ARMREG_IP, ARMREG_LR, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
424 /* Restore VFP registers. */
425 if (mono_arm_is_hard_float ()) {
426 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, fregs));
427 ARM_FLDMD (code, ARM_VFP_D0, 8, ARMREG_R0);
430 /* Non-standard function epilogue. Instead of doing a proper
431 * return, we just jump to the compiled code.
433 /* Restore the registers and jump to the code:
434 * Note that IP has been conveniently set to the method addr.
436 ARM_ADD_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, STACK - regsave_size);
437 ARM_POP_NWB (code, 0x5fff);
438 if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
439 ARM_MOV_REG_REG (code, ARMREG_R0, ARMREG_IP);
440 ARM_ADD_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, regsave_size);
441 if (MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type))
442 code = emit_bx (code, ARMREG_LR);
444 code = emit_bx (code, ARMREG_IP);
446 #ifdef USE_JUMP_TABLES
447 load_get_lmf_addr [0] = mono_get_lmf_addr;
448 load_trampoline [0] = (gpointer)mono_get_trampoline_func (tramp_type);
450 constants = (gpointer*)code;
451 constants [0] = mono_get_lmf_addr;
452 constants [1] = (gpointer)mono_get_trampoline_func (tramp_type);
455 /* backpatch by emitting the missing instructions skipped above */
456 ARM_LDR_IMM (load_get_lmf_addr, ARMREG_R0, ARMREG_PC, (code - load_get_lmf_addr - 8));
457 ARM_LDR_IMM (load_trampoline, ARMREG_IP, ARMREG_PC, (code + 4 - load_trampoline - 8));
463 /* Flush instruction cache, since we've generated code */
464 mono_arch_flush_icache (buf, code - buf);
465 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
468 g_assert ((code - buf) <= buf_len);
471 tramp_name = mono_get_generic_trampoline_name (tramp_type);
472 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
479 mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
483 code = buf = mono_global_codeman_reserve (16);
485 code = emit_bx (code, ARMREG_LR);
487 mono_arch_flush_icache (buf, code - buf);
488 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
490 *info = mono_tramp_info_create ("nullified_class_init_trampoline", buf, code - buf, NULL, NULL);
495 #define SPEC_TRAMP_SIZE 24
498 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
500 guint8 *code, *buf, *tramp;
502 #ifndef USE_JUMP_TABLES
503 guint32 short_branch = FALSE;
505 guint32 size = SPEC_TRAMP_SIZE;
507 tramp = mono_get_trampoline_code (tramp_type);
510 mono_domain_lock (domain);
511 #ifdef USE_JUMP_TABLES
512 code = buf = mono_domain_code_reserve_align (domain, size, 4);
514 code = buf = mono_domain_code_reserve_align (domain, size, 4);
515 if ((short_branch = branch_for_target_reachable (code + 4, tramp))) {
517 mono_domain_code_commit (domain, code, SPEC_TRAMP_SIZE, size);
520 mono_domain_unlock (domain);
522 code = buf = mono_global_codeman_reserve (size);
523 short_branch = FALSE;
526 #ifdef USE_JUMP_TABLES
527 /* For jumptables case we always generate the same code for trampolines,
529 * push {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, lr}
535 ARM_PUSH (code, 0x5fff);
536 constants = mono_jumptable_add_entries (2);
537 code = mono_arm_load_jumptable_entry_addr (code, constants, ARMREG_LR);
538 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_LR, 4);
539 code = emit_bx (code, ARMREG_R1);
540 constants [0] = arg1;
541 constants [1] = tramp;
543 /* we could reduce this to 12 bytes if tramp is within reach:
547 * The called code can access method using the lr register
548 * A 20 byte sequence could be:
550 * ARM_MOV_REG_REG (lr, pc)
551 * ARM_LDR_IMM (pc, pc, 0)
555 /* We save all the registers, except PC and SP */
556 ARM_PUSH (code, 0x5fff);
558 constants = (gpointer*)code;
559 constants [0] = GUINT_TO_POINTER (short_branch | (1 << 24));
560 constants [1] = arg1;
563 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 8); /* temp reg */
564 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
565 code = emit_bx (code, ARMREG_R1);
567 constants = (gpointer*)code;
568 constants [0] = arg1;
569 constants [1] = tramp;
574 /* Flush instruction cache, since we've generated code */
575 mono_arch_flush_icache (buf, code - buf);
576 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_SPECIFIC_TRAMPOLINE, mono_get_generic_trampoline_simple_name (tramp_type));
578 g_assert ((code - buf) <= size);
581 *code_len = code - buf;
587 * mono_arch_get_unbox_trampoline:
589 * @addr: pointer to native code for @m
591 * when value type methods are called through the vtable we need to unbox the
592 * this argument. This method returns a pointer to a trampoline which does
593 * unboxing before calling the method
596 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
598 guint8 *code, *start;
599 MonoDomain *domain = mono_domain_get ();
600 #ifdef USE_JUMP_TABLES
607 start = code = mono_domain_code_reserve (domain, size);
609 #ifdef USE_JUMP_TABLES
610 jte = mono_jumptable_add_entry ();
611 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_IP);
612 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_R0, sizeof (MonoObject));
613 code = emit_bx (code, ARMREG_IP);
616 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 4);
617 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_R0, sizeof (MonoObject));
618 code = emit_bx (code, ARMREG_IP);
619 *(guint32*)code = (guint32)addr;
622 mono_arch_flush_icache (start, code - start);
623 mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_UNBOX_TRAMPOLINE, m);
624 g_assert ((code - start) <= size);
625 /*g_print ("unbox trampoline at %d for %s:%s\n", this_pos, m->klass->name, m->name);
626 g_print ("unbox code is at %p for method at %p\n", start, addr);*/
632 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
634 guint8 *code, *start;
635 #ifdef USE_JUMP_TABLES
641 MonoDomain *domain = mono_domain_get ();
643 start = code = mono_domain_code_reserve (domain, buf_len);
645 #ifdef USE_JUMP_TABLES
646 jte = mono_jumptable_add_entries (2);
647 code = mono_arm_load_jumptable_entry_addr (code, jte, ARMREG_IP);
648 ARM_LDR_IMM (code, MONO_ARCH_RGCTX_REG, ARMREG_IP, 0);
649 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_IP, 4);
650 ARM_BX (code, ARMREG_IP);
654 ARM_LDR_IMM (code, MONO_ARCH_RGCTX_REG, ARMREG_PC, 0);
655 ARM_LDR_IMM (code, ARMREG_PC, ARMREG_PC, 0);
656 *(guint32*)code = (guint32)mrgctx;
658 *(guint32*)code = (guint32)addr;
662 g_assert ((code - start) <= buf_len);
664 mono_arch_flush_icache (start, code - start);
665 mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
671 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
677 guint8 **rgctx_null_jumps;
681 MonoJumpInfo *ji = NULL;
682 GSList *unwind_ops = NULL;
683 #ifdef USE_JUMP_TABLES
687 mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
688 index = MONO_RGCTX_SLOT_INDEX (slot);
690 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
691 for (depth = 0; ; ++depth) {
692 int size = mono_class_rgctx_get_array_size (depth, mrgctx);
694 if (index < size - 1)
699 tramp_size = 64 + 16 * depth;
701 code = buf = mono_global_codeman_reserve (tramp_size);
703 mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, 0);
705 rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
708 /* The vtable/mrgctx is in R0 */
709 g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
713 ARM_MOV_REG_REG (code, ARMREG_R1, ARMREG_R0);
715 /* load rgctx ptr from vtable */
716 g_assert (arm_is_imm12 (MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context)));
717 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R0, MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context));
718 /* is the rgctx ptr null? */
719 ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
720 /* if yes, jump to actual trampoline */
721 rgctx_null_jumps [njumps ++] = code;
722 ARM_B_COND (code, ARMCOND_EQ, 0);
725 for (i = 0; i < depth; ++i) {
726 /* load ptr to next array */
727 if (mrgctx && i == 0) {
728 g_assert (arm_is_imm12 (MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT));
729 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R1, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT);
731 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R1, 0);
733 /* is the ptr null? */
734 ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
735 /* if yes, jump to actual trampoline */
736 rgctx_null_jumps [njumps ++] = code;
737 ARM_B_COND (code, ARMCOND_EQ, 0);
741 code = mono_arm_emit_load_imm (code, ARMREG_R2, sizeof (gpointer) * (index + 1));
742 ARM_LDR_REG_REG (code, ARMREG_R1, ARMREG_R1, ARMREG_R2);
743 /* is the slot null? */
744 ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
745 /* if yes, jump to actual trampoline */
746 rgctx_null_jumps [njumps ++] = code;
747 ARM_B_COND (code, ARMCOND_EQ, 0);
748 /* otherwise return, result is in R1 */
749 ARM_MOV_REG_REG (code, ARMREG_R0, ARMREG_R1);
750 code = emit_bx (code, ARMREG_LR);
752 g_assert (njumps <= depth + 2);
753 for (i = 0; i < njumps; ++i)
754 arm_patch (rgctx_null_jumps [i], code);
756 g_free (rgctx_null_jumps);
760 /* The vtable/mrgctx is still in R0 */
763 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
764 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 0);
766 *(gpointer*)code = NULL;
768 ARM_LDR_REG_REG (code, ARMREG_PC, ARMREG_PC, ARMREG_R1);
770 tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), &code_len);
772 /* Jump to the actual trampoline */
773 #ifdef USE_JUMP_TABLES
774 jte = mono_jumptable_add_entry ();
776 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_R1);
777 code = emit_bx (code, ARMREG_R1);
779 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 0); /* temp reg */
780 code = emit_bx (code, ARMREG_R1);
781 *(gpointer*)code = tramp;
786 mono_arch_flush_icache (buf, code - buf);
787 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
789 g_assert (code - buf <= tramp_size);
791 char *name = mono_get_rgctx_fetch_trampoline_name (slot);
792 *info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);
799 mono_arch_create_general_rgctx_lazy_fetch_trampoline (MonoTrampInfo **info, gboolean aot)
803 MonoJumpInfo *ji = NULL;
804 GSList *unwind_ops = NULL;
810 code = buf = mono_global_codeman_reserve (tramp_size);
812 mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, 0);
814 // FIXME: Currently, we always go to the slow path.
815 /* Load trampoline addr */
816 ARM_LDR_IMM (code, ARMREG_R1, MONO_ARCH_RGCTX_REG, 4);
817 /* The vtable/mrgctx is in R0 */
818 g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
819 code = emit_bx (code, ARMREG_R1);
821 mono_arch_flush_icache (buf, code - buf);
822 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
824 g_assert (code - buf <= tramp_size);
826 *info = mono_tramp_info_create ("rgctx_fetch_trampoline_general", buf, code - buf, ji, unwind_ops);
832 handler_block_trampoline_helper (gpointer *ptr)
834 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
835 return jit_tls->handler_block_return_address;
839 mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
844 MonoJumpInfo *ji = NULL;
845 GSList *unwind_ops = NULL;
849 code = buf = mono_global_codeman_reserve (tramp_size);
851 tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD, NULL, NULL);
854 This trampoline restore the call chain of the handler block then jumps into the code that deals with it.
858 * We are in a method frame after the call emitted by OP_CALL_HANDLER.
860 /* Obtain jit_tls->handler_block_return_address */
861 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_PC, 0);
863 *(gpointer*)code = handler_block_trampoline_helper;
866 /* Set it as the return address so the trampoline will return to it */
867 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_R0);
869 /* Call the trampoline */
870 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_PC, 0);
871 code = emit_bx (code, ARMREG_R0);
872 *(gpointer*)code = tramp;
875 mono_arch_flush_icache (buf, code - buf);
876 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
877 g_assert (code - buf <= tramp_size);
879 *info = mono_tramp_info_create ("handler_block_trampoline", buf, code - buf, ji, unwind_ops);
885 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
888 GSList *unwind_ops = NULL;
889 MonoJumpInfo *ji = NULL;
892 buf = code = mono_global_codeman_reserve (96);
895 * Construct the MonoContext structure on the stack.
898 frame_size = sizeof (MonoContext);
899 frame_size = ALIGN_TO (frame_size, MONO_ARCH_FRAME_ALIGNMENT);
900 ARM_SUB_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, frame_size);
902 /* save ip, lr and pc into their correspodings ctx.regs slots. */
903 ARM_STR_IMM (code, ARMREG_IP, ARMREG_SP, MONO_STRUCT_OFFSET (MonoContext, regs) + sizeof (mgreg_t) * ARMREG_IP);
904 ARM_STR_IMM (code, ARMREG_LR, ARMREG_SP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_LR);
905 ARM_STR_IMM (code, ARMREG_LR, ARMREG_SP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_PC);
907 /* save r0..r10 and fp */
908 ARM_ADD_REG_IMM8 (code, ARMREG_IP, ARMREG_SP, MONO_STRUCT_OFFSET (MonoContext, regs));
909 ARM_STM (code, ARMREG_IP, 0x0fff);
911 /* now we can update fp. */
912 ARM_MOV_REG_REG (code, ARMREG_FP, ARMREG_SP);
914 /* make ctx.esp hold the actual value of sp at the beginning of this method. */
915 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_FP, frame_size);
916 ARM_STR_IMM (code, ARMREG_R0, ARMREG_IP, 4 * ARMREG_SP);
917 ARM_STR_IMM (code, ARMREG_R0, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_SP);
919 /* make ctx.eip hold the address of the call. */
920 ARM_SUB_REG_IMM8 (code, ARMREG_LR, ARMREG_LR, 4);
921 ARM_STR_IMM (code, ARMREG_LR, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, pc));
923 /* r0 now points to the MonoContext */
924 ARM_MOV_REG_REG (code, ARMREG_R0, ARMREG_FP);
928 #ifdef USE_JUMP_TABLES
930 gpointer *jte = mono_jumptable_add_entry ();
931 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_IP);
935 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
938 *(gpointer*)code = debugger_agent_single_step_from_context;
940 *(gpointer*)code = debugger_agent_breakpoint_from_context;
943 ARM_BLX_REG (code, ARMREG_IP);
945 /* we're back; save ctx.eip and ctx.esp into the corresponding regs slots. */
946 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, pc));
947 ARM_STR_IMM (code, ARMREG_R0, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_LR);
948 ARM_STR_IMM (code, ARMREG_R0, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_PC);
950 /* make ip point to the regs array, then restore everything, including pc. */
951 ARM_ADD_REG_IMM8 (code, ARMREG_IP, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, regs));
952 ARM_LDM (code, ARMREG_IP, 0xffff);
954 mono_arch_flush_icache (buf, code - buf);
955 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
957 const char *tramp_name = single_step ? "sdb_single_step_trampoline" : "sdb_breakpoint_trampoline";
958 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
966 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
968 g_assert_not_reached ();
973 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
975 g_assert_not_reached ();
980 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
982 g_assert_not_reached ();
987 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
989 g_assert_not_reached ();
994 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
996 g_assert_not_reached ();
1001 mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
1003 g_assert_not_reached ();
1008 mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
1010 g_assert_not_reached ();
1015 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
1017 g_assert_not_reached ();
1021 #endif /* DISABLE_JIT */
1024 mono_arch_get_call_target (guint8 *code)
1026 guint32 ins = ((guint32*)(gpointer)code) [-1];
1029 /* Should be a 'bl' or a 'b' */
1030 if (((ins >> 25) & 0x7) == 0x5) {
1032 /* Should be a 'bl' */
1033 if ((((ins >> 25) & 0x7) == 0x5) && (((ins >> 24) & 0x1) == 0x1)) {
1035 gint32 disp = ((((gint32)ins) & 0xffffff) << 8) >> 8;
1036 guint8 *target = code - 4 + 8 + (disp * 4);
1045 mono_arch_get_plt_info_offset (guint8 *plt_entry, mgreg_t *regs, guint8 *code)
1047 /* The offset is stored as the 4th word of the plt entry */
1048 return ((guint32*)plt_entry) [3];
1052 * Return the address of the PLT entry called by the thumb code CODE.
1055 mono_arm_get_thumb_plt_entry (guint8 *code)
1057 int s, j1, j2, imm10, imm11, i1, i2, imm32;
1062 /* code should be right after a BL */
1063 code = (guint8*)((mgreg_t)code & ~1);
1064 base = (guint8*)((mgreg_t)code & ~3);
1066 t1 = ((guint16*)bl) [0];
1067 t2 = ((guint16*)bl) [1];
1069 g_assert ((t1 >> 11) == 0x1e);
1071 s = (t1 >> 10) & 0x1;
1072 imm10 = (t1 >> 0) & 0x3ff;
1073 j1 = (t2 >> 13) & 0x1;
1074 j2 = (t2 >> 11) & 0x1;
1077 i1 = (s ^ j1) ? 0 : 1;
1078 i2 = (s ^ j2) ? 0 : 1;
1080 imm32 = (imm11 << 1) | (imm10 << 12) | (i2 << 22) | (i1 << 23);
1082 /* Sign extend from 24 bits to 32 bits */
1083 imm32 = ((gint32)imm32 << 8) >> 8;
1085 target = code + imm32;
1087 /* target now points to the thumb plt entry */
1088 /* ldr.w r12, [pc, #8] */
1089 g_assert (((guint16*)target) [0] == 0xf8df);
1090 g_assert (((guint16*)target) [1] == 0xc008);
1093 * The PLT info offset is at offset 16, but mono_arch_get_plt_entry_offset () returns
1094 * the 3rd word, so compensate by returning a different value.
1104 * mono_arch_get_gsharedvt_arg_trampoline:
1106 * See tramp-x86.c for documentation.
1109 mono_arch_get_gsharedvt_arg_trampoline (MonoDomain *domain, gpointer arg, gpointer addr)
1113 gpointer *constants;
1117 buf = code = mono_domain_code_reserve (domain, buf_len);
1119 /* Similar to the specialized trampoline code */
1120 ARM_PUSH (code, (1 << ARMREG_R0) | (1 << ARMREG_R1) | (1 << ARMREG_R2) | (1 << ARMREG_R3) | (1 << ARMREG_LR));
1121 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 8);
1122 /* arg is passed in LR */
1123 ARM_LDR_IMM (code, ARMREG_LR, ARMREG_PC, 0);
1124 code = emit_bx (code, ARMREG_IP);
1125 constants = (gpointer*)code;
1126 constants [0] = arg;
1127 constants [1] = addr;
1130 g_assert ((code - buf) <= buf_len);
1132 nacl_domain_code_validate (domain, &buf, buf_len, &code);
1133 mono_arch_flush_icache (buf, code - buf);
1134 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
1142 mono_arch_get_gsharedvt_arg_trampoline (MonoDomain *domain, gpointer arg, gpointer addr)
1144 g_assert_not_reached ();
1150 #if defined(ENABLE_GSHAREDVT)
1152 #include "../../../mono-extensions/mono/mini/tramp-arm-gsharedvt.c"
1157 mono_arm_start_gsharedvt_call (GSharedVtCallInfo *info, gpointer *caller, gpointer *callee, gpointer mrgctx_reg)
1159 g_assert_not_reached ();
1164 mono_arch_get_gsharedvt_trampoline (MonoTrampInfo **info, gboolean aot)
1170 #endif /* !MONOTOUCH */