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;
134 #define arm_is_imm12(v) ((int)(v) > -4096 && (int)(v) < 4096)
136 #ifndef USE_JUMP_TABLES
138 * Return the instruction to jump from code to target, 0 if not
139 * reachable with a single instruction
142 branch_for_target_reachable (guint8 *branch, guint8 *target)
144 gint diff = target - branch - 8;
145 g_assert ((diff & 3) == 0);
147 if (diff <= 33554431)
148 return (ARMCOND_AL << ARMCOND_SHIFT) | (ARM_BR_TAG) | (diff >> 2);
150 /* diff between 0 and -33554432 */
151 if (diff >= -33554432)
152 return (ARMCOND_AL << ARMCOND_SHIFT) | (ARM_BR_TAG) | ((diff >> 2) & ~0xff000000);
158 static inline guint8*
159 emit_bx (guint8* code, int reg)
161 if (mono_arm_thumb_supported ())
164 ARM_MOV_REG_REG (code, ARMREG_PC, reg);
168 /* Stack size for trampoline function
170 #define STACK ALIGN_TO (sizeof (MonoLMF), 8)
172 /* Method-specific trampoline code fragment size */
173 #define METHOD_TRAMPOLINE_SIZE 64
175 /* Jump-specific trampoline code fragment size */
176 #define JUMP_TRAMPOLINE_SIZE 64
179 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
182 guint8 *buf, *code = NULL;
183 #ifdef USE_JUMP_TABLES
184 gpointer *load_get_lmf_addr = NULL, *load_trampoline = NULL;
186 guint8 *load_get_lmf_addr = NULL, *load_trampoline = NULL;
190 int cfa_offset, regsave_size, lr_offset;
191 GSList *unwind_ops = NULL;
192 MonoJumpInfo *ji = NULL;
195 #ifdef USE_JUMP_TABLES
199 /* Now we'll create in 'buf' the ARM trampoline code. This
200 is the trampoline code common to all methods */
204 /* Add space for saving/restoring VFP regs. */
205 if (mono_arm_is_hard_float ())
208 code = buf = mono_global_codeman_reserve (buf_len);
211 * At this point lr points to the specific arg and sp points to the saved
212 * regs on the stack (all but PC and SP). The original LR value has been
213 * saved as sp + LR_OFFSET by the push in the specific trampoline
216 /* The size of the area already allocated by the push in the specific trampoline */
217 regsave_size = 14 * sizeof (mgreg_t);
218 /* The offset where lr was saved inside the regsave area */
219 lr_offset = 13 * sizeof (mgreg_t);
221 // CFA = SP + (num registers pushed) * 4
222 cfa_offset = 14 * sizeof (mgreg_t);
223 mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, cfa_offset);
224 // PC saved at sp+LR_OFFSET
225 mono_add_unwind_op_offset (unwind_ops, code, buf, ARMREG_LR, -4);
229 * For page trampolines the data is in r1, so just move it, otherwise use the got slot as below.
230 * The trampoline contains a pc-relative offset to the got slot
231 * preceeding the got slot where the value is stored. The offset can be
235 ARM_MOV_REG_REG (code, ARMREG_V2, ARMREG_R1);
237 ARM_LDR_IMM (code, ARMREG_V2, ARMREG_LR, 0);
238 ARM_ADD_REG_IMM (code, ARMREG_V2, ARMREG_V2, 4, 0);
239 ARM_LDR_REG_REG (code, ARMREG_V2, ARMREG_V2, ARMREG_LR);
242 ARM_LDR_IMM (code, ARMREG_V2, ARMREG_LR, 0);
244 ARM_LDR_IMM (code, ARMREG_V3, ARMREG_SP, lr_offset);
246 /* ok, now we can continue with the MonoLMF setup, mostly untouched
247 * from emit_prolog in mini-arm.c
248 * This is a synthetized call to mono_get_lmf_addr ()
251 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
252 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_PC, 0);
254 *(gpointer*)code = NULL;
256 ARM_LDR_REG_REG (code, ARMREG_R0, ARMREG_PC, ARMREG_R0);
258 #ifdef USE_JUMP_TABLES
259 load_get_lmf_addr = mono_jumptable_add_entry ();
260 code = mono_arm_load_jumptable_entry (code, load_get_lmf_addr, ARMREG_R0);
262 load_get_lmf_addr = code;
266 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
267 code = emit_bx (code, ARMREG_R0);
269 /* we build the MonoLMF structure on the stack - see mini-arm.h
270 * The pointer to the struct is put in r1.
271 * the iregs array is already allocated on the stack by push.
273 code = mono_arm_emit_load_imm (code, ARMREG_R2, STACK - regsave_size);
274 ARM_SUB_REG_REG (code, ARMREG_SP, ARMREG_SP, ARMREG_R2);
275 cfa_offset += STACK - regsave_size;
276 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, cfa_offset);
278 code = mono_arm_emit_load_imm (code, ARMREG_R2, STACK - sizeof (MonoLMF));
279 ARM_ADD_REG_REG (code, ARMREG_V1, ARMREG_SP, ARMREG_R2);
282 * The stack now looks like:
284 * v1 -> <rest of LMF>
288 /* r0 is the result from mono_get_lmf_addr () */
289 ARM_STR_IMM (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
290 /* new_lmf->previous_lmf = *lmf_addr */
291 ARM_LDR_IMM (code, ARMREG_R2, ARMREG_R0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
292 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
293 /* *(lmf_addr) = r1 */
294 ARM_STR_IMM (code, ARMREG_V1, ARMREG_R0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
295 /* save method info (it's in v2) */
296 if ((tramp_type == MONO_TRAMPOLINE_JIT) || (tramp_type == MONO_TRAMPOLINE_JUMP))
297 ARM_STR_IMM (code, ARMREG_V2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, method));
299 ARM_MOV_REG_IMM8 (code, ARMREG_R2, 0);
300 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, method));
303 code = mono_arm_emit_load_imm (code, ARMREG_R2, cfa_offset);
304 ARM_ADD_REG_REG (code, ARMREG_R2, ARMREG_SP, ARMREG_R2);
305 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, sp));
307 ARM_LDR_IMM (code, ARMREG_R2, ARMREG_V1, (MONO_STRUCT_OFFSET (MonoLMF, iregs) + ARMREG_FP*4));
308 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, fp));
309 /* save the IP (caller ip) */
310 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
311 ARM_MOV_REG_IMM8 (code, ARMREG_R2, 0);
313 ARM_LDR_IMM (code, ARMREG_R2, ARMREG_V1, (MONO_STRUCT_OFFSET (MonoLMF, iregs) + 13*4));
315 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, ip));
317 /* Save VFP registers. */
318 if (mono_arm_is_hard_float ()) {
320 * Strictly speaking, we don't have to save d0-d7 in the LMF, but
321 * it's easier than attempting to store them on the stack since
322 * this trampoline code is pretty messy.
324 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, fregs));
325 ARM_FSTMD (code, ARM_VFP_D0, 8, ARMREG_R0);
329 * Now we're ready to call xxx_trampoline ().
331 /* Arg 1: the saved registers */
332 ARM_ADD_REG_IMM (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, iregs), 0);
334 /* Arg 2: code (next address to the instruction that called us) */
335 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
336 ARM_MOV_REG_IMM8 (code, ARMREG_R1, 0);
338 ARM_MOV_REG_REG (code, ARMREG_R1, ARMREG_V3);
341 /* Arg 3: the specific argument, stored in v2
343 ARM_MOV_REG_REG (code, ARMREG_R2, ARMREG_V2);
346 char *icall_name = g_strdup_printf ("trampoline_func_%d", tramp_type);
347 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, icall_name);
348 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
350 *(gpointer*)code = NULL;
352 ARM_LDR_REG_REG (code, ARMREG_IP, ARMREG_PC, ARMREG_IP);
354 #ifdef USE_JUMP_TABLES
355 load_trampoline = mono_jumptable_add_entry ();
356 code = mono_arm_load_jumptable_entry (code, load_trampoline, ARMREG_IP);
358 load_trampoline = code;
363 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
364 code = emit_bx (code, ARMREG_IP);
366 /* OK, code address is now on r0. Move it to the place on the stack
367 * where IP was saved (it is now no more useful to us and it can be
368 * clobbered). This way we can just restore all the regs in one inst
371 ARM_STR_IMM (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, iregs) + (ARMREG_R12 * sizeof (mgreg_t)));
373 /* Check for thread interruption */
374 /* This is not perf critical code so no need to check the interrupt flag */
376 * Have to call the _force_ variant, since there could be a protected wrapper on the top of the stack.
379 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_force_interruption_checkpoint");
380 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
382 *(gpointer*)code = NULL;
384 ARM_LDR_REG_REG (code, ARMREG_IP, ARMREG_PC, ARMREG_IP);
386 #ifdef USE_JUMP_TABLES
387 gpointer *jte = mono_jumptable_add_entry ();
388 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_IP);
389 jte [0] = mono_thread_force_interruption_checkpoint;
391 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
393 *(gpointer*)code = mono_thread_force_interruption_checkpoint;
397 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
398 code = emit_bx (code, ARMREG_IP);
401 * Now we restore the MonoLMF (see emit_epilogue in mini-arm.c)
402 * and the rest of the registers, so the method called will see
403 * the same state as before we executed.
405 /* ip = previous_lmf */
406 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
408 ARM_LDR_IMM (code, ARMREG_LR, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
409 /* *(lmf_addr) = previous_lmf */
410 ARM_STR_IMM (code, ARMREG_IP, ARMREG_LR, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
412 /* Restore VFP registers. */
413 if (mono_arm_is_hard_float ()) {
414 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, fregs));
415 ARM_FLDMD (code, ARM_VFP_D0, 8, ARMREG_R0);
418 /* Non-standard function epilogue. Instead of doing a proper
419 * return, we just jump to the compiled code.
421 /* Restore the registers and jump to the code:
422 * Note that IP has been conveniently set to the method addr.
424 ARM_ADD_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, STACK - regsave_size);
425 cfa_offset -= STACK - regsave_size;
426 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, cfa_offset);
427 ARM_POP_NWB (code, 0x5fff);
428 mono_add_unwind_op_same_value (unwind_ops, code, buf, ARMREG_LR);
429 if (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH)
430 ARM_MOV_REG_REG (code, ARMREG_R0, ARMREG_IP);
431 ARM_ADD_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, regsave_size);
432 cfa_offset -= regsave_size;
433 g_assert (cfa_offset == 0);
434 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, cfa_offset);
435 if (MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type))
436 code = emit_bx (code, ARMREG_LR);
438 code = emit_bx (code, ARMREG_IP);
440 #ifdef USE_JUMP_TABLES
441 load_get_lmf_addr [0] = mono_get_lmf_addr;
442 load_trampoline [0] = (gpointer)mono_get_trampoline_func (tramp_type);
444 constants = (gpointer*)code;
445 constants [0] = mono_get_lmf_addr;
446 constants [1] = (gpointer)mono_get_trampoline_func (tramp_type);
449 /* backpatch by emitting the missing instructions skipped above */
450 ARM_LDR_IMM (load_get_lmf_addr, ARMREG_R0, ARMREG_PC, (code - load_get_lmf_addr - 8));
451 ARM_LDR_IMM (load_trampoline, ARMREG_IP, ARMREG_PC, (code + 4 - load_trampoline - 8));
457 /* Flush instruction cache, since we've generated code */
458 mono_arch_flush_icache (buf, code - buf);
459 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
462 g_assert ((code - buf) <= buf_len);
465 tramp_name = mono_get_generic_trampoline_name (tramp_type);
466 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
472 #define SPEC_TRAMP_SIZE 24
475 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
477 guint8 *code, *buf, *tramp;
479 #ifndef USE_JUMP_TABLES
480 guint32 short_branch = FALSE;
482 guint32 size = SPEC_TRAMP_SIZE;
484 tramp = mono_get_trampoline_code (tramp_type);
487 mono_domain_lock (domain);
488 #ifdef USE_JUMP_TABLES
489 code = buf = mono_domain_code_reserve_align (domain, size, 4);
491 code = buf = mono_domain_code_reserve_align (domain, size, 4);
492 if ((short_branch = branch_for_target_reachable (code + 4, tramp))) {
494 mono_domain_code_commit (domain, code, SPEC_TRAMP_SIZE, size);
497 mono_domain_unlock (domain);
499 code = buf = mono_global_codeman_reserve (size);
500 short_branch = FALSE;
503 #ifdef USE_JUMP_TABLES
504 /* For jumptables case we always generate the same code for trampolines,
506 * push {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, lr}
512 ARM_PUSH (code, 0x5fff);
513 constants = mono_jumptable_add_entries (2);
514 code = mono_arm_load_jumptable_entry_addr (code, constants, ARMREG_LR);
515 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_LR, 4);
516 code = emit_bx (code, ARMREG_R1);
517 constants [0] = arg1;
518 constants [1] = tramp;
520 /* we could reduce this to 12 bytes if tramp is within reach:
524 * The called code can access method using the lr register
525 * A 20 byte sequence could be:
527 * ARM_MOV_REG_REG (lr, pc)
528 * ARM_LDR_IMM (pc, pc, 0)
532 /* We save all the registers, except PC and SP */
533 ARM_PUSH (code, 0x5fff);
535 constants = (gpointer*)code;
536 constants [0] = GUINT_TO_POINTER (short_branch | (1 << 24));
537 constants [1] = arg1;
540 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 8); /* temp reg */
541 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
542 code = emit_bx (code, ARMREG_R1);
544 constants = (gpointer*)code;
545 constants [0] = arg1;
546 constants [1] = tramp;
551 /* Flush instruction cache, since we've generated code */
552 mono_arch_flush_icache (buf, code - buf);
553 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_SPECIFIC_TRAMPOLINE, mono_get_generic_trampoline_simple_name (tramp_type));
555 g_assert ((code - buf) <= size);
558 *code_len = code - buf;
564 * mono_arch_get_unbox_trampoline:
566 * @addr: pointer to native code for @m
568 * when value type methods are called through the vtable we need to unbox the
569 * this argument. This method returns a pointer to a trampoline which does
570 * unboxing before calling the method
573 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
575 guint8 *code, *start;
576 MonoDomain *domain = mono_domain_get ();
578 #ifdef USE_JUMP_TABLES
585 start = code = mono_domain_code_reserve (domain, size);
587 unwind_ops = mono_arch_get_cie_program ();
589 #ifdef USE_JUMP_TABLES
590 jte = mono_jumptable_add_entry ();
591 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_IP);
592 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_R0, sizeof (MonoObject));
593 code = emit_bx (code, ARMREG_IP);
596 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 4);
597 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_R0, sizeof (MonoObject));
598 code = emit_bx (code, ARMREG_IP);
599 *(guint32*)code = (guint32)addr;
602 mono_arch_flush_icache (start, code - start);
603 mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_UNBOX_TRAMPOLINE, m);
604 g_assert ((code - start) <= size);
605 /*g_print ("unbox trampoline at %d for %s:%s\n", this_pos, m->klass->name, m->name);
606 g_print ("unbox code is at %p for method at %p\n", start, addr);*/
608 mono_tramp_info_register (mono_tramp_info_create (NULL, start, code - start, NULL, unwind_ops), domain);
614 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
616 guint8 *code, *start;
618 #ifdef USE_JUMP_TABLES
624 MonoDomain *domain = mono_domain_get ();
626 start = code = mono_domain_code_reserve (domain, buf_len);
628 unwind_ops = mono_arch_get_cie_program ();
630 #ifdef USE_JUMP_TABLES
631 jte = mono_jumptable_add_entries (2);
632 code = mono_arm_load_jumptable_entry_addr (code, jte, ARMREG_IP);
633 ARM_LDR_IMM (code, MONO_ARCH_RGCTX_REG, ARMREG_IP, 0);
634 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_IP, 4);
635 ARM_BX (code, ARMREG_IP);
639 ARM_LDR_IMM (code, MONO_ARCH_RGCTX_REG, ARMREG_PC, 0);
640 ARM_LDR_IMM (code, ARMREG_PC, ARMREG_PC, 0);
641 *(guint32*)code = (guint32)mrgctx;
643 *(guint32*)code = (guint32)addr;
647 g_assert ((code - start) <= buf_len);
649 mono_arch_flush_icache (start, code - start);
650 mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
652 mono_tramp_info_register (mono_tramp_info_create (NULL, start, code - start, NULL, unwind_ops), domain);
658 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
664 guint8 **rgctx_null_jumps;
668 MonoJumpInfo *ji = NULL;
669 GSList *unwind_ops = NULL;
670 #ifdef USE_JUMP_TABLES
674 mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
675 index = MONO_RGCTX_SLOT_INDEX (slot);
677 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
678 for (depth = 0; ; ++depth) {
679 int size = mono_class_rgctx_get_array_size (depth, mrgctx);
681 if (index < size - 1)
686 tramp_size = 64 + 16 * depth;
688 code = buf = mono_global_codeman_reserve (tramp_size);
690 unwind_ops = mono_arch_get_cie_program ();
692 rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
695 /* The vtable/mrgctx is in R0 */
696 g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
700 ARM_MOV_REG_REG (code, ARMREG_R1, ARMREG_R0);
702 /* load rgctx ptr from vtable */
703 g_assert (arm_is_imm12 (MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context)));
704 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R0, MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context));
705 /* is the rgctx ptr null? */
706 ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
707 /* if yes, jump to actual trampoline */
708 rgctx_null_jumps [njumps ++] = code;
709 ARM_B_COND (code, ARMCOND_EQ, 0);
712 for (i = 0; i < depth; ++i) {
713 /* load ptr to next array */
714 if (mrgctx && i == 0) {
715 g_assert (arm_is_imm12 (MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT));
716 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R1, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT);
718 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R1, 0);
720 /* is the ptr null? */
721 ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
722 /* if yes, jump to actual trampoline */
723 rgctx_null_jumps [njumps ++] = code;
724 ARM_B_COND (code, ARMCOND_EQ, 0);
728 code = mono_arm_emit_load_imm (code, ARMREG_R2, sizeof (gpointer) * (index + 1));
729 ARM_LDR_REG_REG (code, ARMREG_R1, ARMREG_R1, ARMREG_R2);
730 /* is the slot null? */
731 ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
732 /* if yes, jump to actual trampoline */
733 rgctx_null_jumps [njumps ++] = code;
734 ARM_B_COND (code, ARMCOND_EQ, 0);
735 /* otherwise return, result is in R1 */
736 ARM_MOV_REG_REG (code, ARMREG_R0, ARMREG_R1);
737 code = emit_bx (code, ARMREG_LR);
739 g_assert (njumps <= depth + 2);
740 for (i = 0; i < njumps; ++i)
741 arm_patch (rgctx_null_jumps [i], code);
743 g_free (rgctx_null_jumps);
747 /* The vtable/mrgctx is still in R0 */
750 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
751 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 0);
753 *(gpointer*)code = NULL;
755 ARM_LDR_REG_REG (code, ARMREG_PC, ARMREG_PC, ARMREG_R1);
757 tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), &code_len);
759 /* Jump to the actual trampoline */
760 #ifdef USE_JUMP_TABLES
761 jte = mono_jumptable_add_entry ();
763 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_R1);
764 code = emit_bx (code, ARMREG_R1);
766 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 0); /* temp reg */
767 code = emit_bx (code, ARMREG_R1);
768 *(gpointer*)code = tramp;
773 mono_arch_flush_icache (buf, code - buf);
774 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
776 g_assert (code - buf <= tramp_size);
778 char *name = mono_get_rgctx_fetch_trampoline_name (slot);
779 *info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);
786 mono_arch_create_general_rgctx_lazy_fetch_trampoline (MonoTrampInfo **info, gboolean aot)
790 MonoJumpInfo *ji = NULL;
791 GSList *unwind_ops = NULL;
797 code = buf = mono_global_codeman_reserve (tramp_size);
799 unwind_ops = mono_arch_get_cie_program ();
801 // FIXME: Currently, we always go to the slow path.
802 /* Load trampoline addr */
803 ARM_LDR_IMM (code, ARMREG_R1, MONO_ARCH_RGCTX_REG, 4);
804 /* The vtable/mrgctx is in R0 */
805 g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
806 code = emit_bx (code, ARMREG_R1);
808 mono_arch_flush_icache (buf, code - buf);
809 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
811 g_assert (code - buf <= tramp_size);
813 *info = mono_tramp_info_create ("rgctx_fetch_trampoline_general", buf, code - buf, ji, unwind_ops);
819 handler_block_trampoline_helper (gpointer *ptr)
821 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
822 return jit_tls->handler_block_return_address;
826 mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
831 MonoJumpInfo *ji = NULL;
832 GSList *unwind_ops = NULL;
836 code = buf = mono_global_codeman_reserve (tramp_size);
838 unwind_ops = mono_arch_get_cie_program ();
840 tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD, NULL, NULL);
843 This trampoline restore the call chain of the handler block then jumps into the code that deals with it.
847 * We are in a method frame after the call emitted by OP_CALL_HANDLER.
849 /* Obtain jit_tls->handler_block_return_address */
850 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_PC, 0);
852 *(gpointer*)code = handler_block_trampoline_helper;
855 /* Set it as the return address so the trampoline will return to it */
856 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_R0);
858 /* Call the trampoline */
859 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_PC, 0);
860 code = emit_bx (code, ARMREG_R0);
861 *(gpointer*)code = tramp;
864 mono_arch_flush_icache (buf, code - buf);
865 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
866 g_assert (code - buf <= tramp_size);
868 *info = mono_tramp_info_create ("handler_block_trampoline", buf, code - buf, ji, unwind_ops);
874 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
877 GSList *unwind_ops = NULL;
878 MonoJumpInfo *ji = NULL;
881 buf = code = mono_global_codeman_reserve (96);
884 * Construct the MonoContext structure on the stack.
887 frame_size = sizeof (MonoContext);
888 frame_size = ALIGN_TO (frame_size, MONO_ARCH_FRAME_ALIGNMENT);
889 ARM_SUB_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, frame_size);
891 /* save ip, lr and pc into their correspodings ctx.regs slots. */
892 ARM_STR_IMM (code, ARMREG_IP, ARMREG_SP, MONO_STRUCT_OFFSET (MonoContext, regs) + sizeof (mgreg_t) * ARMREG_IP);
893 ARM_STR_IMM (code, ARMREG_LR, ARMREG_SP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_LR);
894 ARM_STR_IMM (code, ARMREG_LR, ARMREG_SP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_PC);
896 /* save r0..r10 and fp */
897 ARM_ADD_REG_IMM8 (code, ARMREG_IP, ARMREG_SP, MONO_STRUCT_OFFSET (MonoContext, regs));
898 ARM_STM (code, ARMREG_IP, 0x0fff);
900 /* now we can update fp. */
901 ARM_MOV_REG_REG (code, ARMREG_FP, ARMREG_SP);
903 /* make ctx.esp hold the actual value of sp at the beginning of this method. */
904 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_FP, frame_size);
905 ARM_STR_IMM (code, ARMREG_R0, ARMREG_IP, 4 * ARMREG_SP);
906 ARM_STR_IMM (code, ARMREG_R0, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_SP);
908 /* make ctx.eip hold the address of the call. */
909 ARM_SUB_REG_IMM8 (code, ARMREG_LR, ARMREG_LR, 4);
910 ARM_STR_IMM (code, ARMREG_LR, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, pc));
912 /* r0 now points to the MonoContext */
913 ARM_MOV_REG_REG (code, ARMREG_R0, ARMREG_FP);
917 #ifdef USE_JUMP_TABLES
919 gpointer *jte = mono_jumptable_add_entry ();
920 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_IP);
924 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
927 *(gpointer*)code = debugger_agent_single_step_from_context;
929 *(gpointer*)code = debugger_agent_breakpoint_from_context;
932 ARM_BLX_REG (code, ARMREG_IP);
934 /* we're back; save ctx.eip and ctx.esp into the corresponding regs slots. */
935 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, pc));
936 ARM_STR_IMM (code, ARMREG_R0, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_LR);
937 ARM_STR_IMM (code, ARMREG_R0, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_PC);
939 /* make ip point to the regs array, then restore everything, including pc. */
940 ARM_ADD_REG_IMM8 (code, ARMREG_IP, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, regs));
941 ARM_LDM (code, ARMREG_IP, 0xffff);
943 mono_arch_flush_icache (buf, code - buf);
944 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
946 const char *tramp_name = single_step ? "sdb_single_step_trampoline" : "sdb_breakpoint_trampoline";
947 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
955 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
957 g_assert_not_reached ();
962 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
964 g_assert_not_reached ();
969 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
971 g_assert_not_reached ();
976 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
978 g_assert_not_reached ();
983 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
985 g_assert_not_reached ();
990 mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
992 g_assert_not_reached ();
997 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
999 g_assert_not_reached ();
1003 #endif /* DISABLE_JIT */
1006 mono_arch_get_call_target (guint8 *code)
1008 guint32 ins = ((guint32*)(gpointer)code) [-1];
1011 /* Should be a 'bl' or a 'b' */
1012 if (((ins >> 25) & 0x7) == 0x5) {
1014 /* Should be a 'bl' */
1015 if ((((ins >> 25) & 0x7) == 0x5) && (((ins >> 24) & 0x1) == 0x1)) {
1017 gint32 disp = ((((gint32)ins) & 0xffffff) << 8) >> 8;
1018 guint8 *target = code - 4 + 8 + (disp * 4);
1027 mono_arch_get_plt_info_offset (guint8 *plt_entry, mgreg_t *regs, guint8 *code)
1029 /* The offset is stored as the 4th word of the plt entry */
1030 return ((guint32*)plt_entry) [3];
1034 * Return the address of the PLT entry called by the thumb code CODE.
1037 mono_arm_get_thumb_plt_entry (guint8 *code)
1039 int s, j1, j2, imm10, imm11, i1, i2, imm32;
1044 /* code should be right after a BL */
1045 code = (guint8*)((mgreg_t)code & ~1);
1046 base = (guint8*)((mgreg_t)code & ~3);
1048 t1 = ((guint16*)bl) [0];
1049 t2 = ((guint16*)bl) [1];
1051 g_assert ((t1 >> 11) == 0x1e);
1053 s = (t1 >> 10) & 0x1;
1054 imm10 = (t1 >> 0) & 0x3ff;
1055 j1 = (t2 >> 13) & 0x1;
1056 j2 = (t2 >> 11) & 0x1;
1059 i1 = (s ^ j1) ? 0 : 1;
1060 i2 = (s ^ j2) ? 0 : 1;
1062 imm32 = (imm11 << 1) | (imm10 << 12) | (i2 << 22) | (i1 << 23);
1064 /* Sign extend from 24 bits to 32 bits */
1065 imm32 = ((gint32)imm32 << 8) >> 8;
1067 target = code + imm32;
1069 /* target now points to the thumb plt entry */
1070 /* ldr.w r12, [pc, #8] */
1071 g_assert (((guint16*)target) [0] == 0xf8df);
1072 g_assert (((guint16*)target) [1] == 0xc008);
1075 * The PLT info offset is at offset 16, but mono_arch_get_plt_entry_offset () returns
1076 * the 3rd word, so compensate by returning a different value.
1086 * mono_arch_get_gsharedvt_arg_trampoline:
1088 * See tramp-x86.c for documentation.
1091 mono_arch_get_gsharedvt_arg_trampoline (MonoDomain *domain, gpointer arg, gpointer addr)
1095 gpointer *constants;
1099 buf = code = mono_domain_code_reserve (domain, buf_len);
1101 /* Similar to the specialized trampoline code */
1102 ARM_PUSH (code, (1 << ARMREG_R0) | (1 << ARMREG_R1) | (1 << ARMREG_R2) | (1 << ARMREG_R3) | (1 << ARMREG_LR));
1103 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 8);
1104 /* arg is passed in LR */
1105 ARM_LDR_IMM (code, ARMREG_LR, ARMREG_PC, 0);
1106 code = emit_bx (code, ARMREG_IP);
1107 constants = (gpointer*)code;
1108 constants [0] = arg;
1109 constants [1] = addr;
1112 g_assert ((code - buf) <= buf_len);
1114 nacl_domain_code_validate (domain, &buf, buf_len, &code);
1115 mono_arch_flush_icache (buf, code - buf);
1116 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
1118 mono_tramp_info_register (mono_tramp_info_create (NULL, buf, code - buf, NULL, NULL), domain);
1126 mono_arch_get_gsharedvt_arg_trampoline (MonoDomain *domain, gpointer arg, gpointer addr)
1128 g_assert_not_reached ();
1134 #if defined(ENABLE_GSHAREDVT)
1136 #include "../../../mono-extensions/mono/mini/tramp-arm-gsharedvt.c"
1141 mono_arm_start_gsharedvt_call (GSharedVtCallInfo *info, gpointer *caller, gpointer *callee, gpointer mrgctx_reg)
1143 g_assert_not_reached ();
1148 mono_arch_get_gsharedvt_trampoline (MonoTrampInfo **info, gboolean aot)
1154 #endif /* !MONOTOUCH */