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 // FIXME: Finish the unwind info, the current info allows us to unwind
222 // when the trampoline is not in the epilog
224 // CFA = SP + (num registers pushed) * 4
225 cfa_offset = 14 * sizeof (mgreg_t);
226 mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, cfa_offset);
227 // PC saved at sp+LR_OFFSET
228 mono_add_unwind_op_offset (unwind_ops, code, buf, ARMREG_LR, -4);
232 * For page trampolines the data is in r1, so just move it, otherwise use the got slot as below.
233 * The trampoline contains a pc-relative offset to the got slot
234 * preceeding the got slot where the value is stored. The offset can be
238 ARM_MOV_REG_REG (code, ARMREG_V2, ARMREG_R1);
240 ARM_LDR_IMM (code, ARMREG_V2, ARMREG_LR, 0);
241 ARM_ADD_REG_IMM (code, ARMREG_V2, ARMREG_V2, 4, 0);
242 ARM_LDR_REG_REG (code, ARMREG_V2, ARMREG_V2, ARMREG_LR);
245 ARM_LDR_IMM (code, ARMREG_V2, ARMREG_LR, 0);
247 ARM_LDR_IMM (code, ARMREG_V3, ARMREG_SP, lr_offset);
249 /* ok, now we can continue with the MonoLMF setup, mostly untouched
250 * from emit_prolog in mini-arm.c
251 * This is a synthetized call to mono_get_lmf_addr ()
254 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
255 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_PC, 0);
257 *(gpointer*)code = NULL;
259 ARM_LDR_REG_REG (code, ARMREG_R0, ARMREG_PC, ARMREG_R0);
261 #ifdef USE_JUMP_TABLES
262 load_get_lmf_addr = mono_jumptable_add_entry ();
263 code = mono_arm_load_jumptable_entry (code, load_get_lmf_addr, ARMREG_R0);
265 load_get_lmf_addr = code;
269 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
270 code = emit_bx (code, ARMREG_R0);
272 /* we build the MonoLMF structure on the stack - see mini-arm.h
273 * The pointer to the struct is put in r1.
274 * the iregs array is already allocated on the stack by push.
276 code = mono_arm_emit_load_imm (code, ARMREG_R2, STACK - regsave_size);
277 ARM_SUB_REG_REG (code, ARMREG_SP, ARMREG_SP, ARMREG_R2);
278 cfa_offset += STACK - regsave_size;
279 mono_add_unwind_op_def_cfa_offset (unwind_ops, code, buf, cfa_offset);
281 code = mono_arm_emit_load_imm (code, ARMREG_R2, STACK - sizeof (MonoLMF));
282 ARM_ADD_REG_REG (code, ARMREG_V1, ARMREG_SP, ARMREG_R2);
285 * The stack now looks like:
287 * v1 -> <rest of LMF>
291 /* r0 is the result from mono_get_lmf_addr () */
292 ARM_STR_IMM (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
293 /* new_lmf->previous_lmf = *lmf_addr */
294 ARM_LDR_IMM (code, ARMREG_R2, ARMREG_R0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
295 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
296 /* *(lmf_addr) = r1 */
297 ARM_STR_IMM (code, ARMREG_V1, ARMREG_R0, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
298 /* save method info (it's in v2) */
299 if ((tramp_type == MONO_TRAMPOLINE_JIT) || (tramp_type == MONO_TRAMPOLINE_JUMP))
300 ARM_STR_IMM (code, ARMREG_V2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, method));
302 ARM_MOV_REG_IMM8 (code, ARMREG_R2, 0);
303 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, method));
306 code = mono_arm_emit_load_imm (code, ARMREG_R2, cfa_offset);
307 ARM_ADD_REG_REG (code, ARMREG_R2, ARMREG_SP, ARMREG_R2);
308 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, sp));
310 ARM_LDR_IMM (code, ARMREG_R2, ARMREG_V1, (MONO_STRUCT_OFFSET (MonoLMF, iregs) + ARMREG_FP*4));
311 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, fp));
312 /* save the IP (caller ip) */
313 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
314 ARM_MOV_REG_IMM8 (code, ARMREG_R2, 0);
316 ARM_LDR_IMM (code, ARMREG_R2, ARMREG_V1, (MONO_STRUCT_OFFSET (MonoLMF, iregs) + 13*4));
318 ARM_STR_IMM (code, ARMREG_R2, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, ip));
320 /* Save VFP registers. */
321 if (mono_arm_is_hard_float ()) {
323 * Strictly speaking, we don't have to save d0-d7 in the LMF, but
324 * it's easier than attempting to store them on the stack since
325 * this trampoline code is pretty messy.
327 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, fregs));
328 ARM_FSTMD (code, ARM_VFP_D0, 8, ARMREG_R0);
332 * Now we're ready to call xxx_trampoline ().
334 /* Arg 1: the saved registers */
335 ARM_ADD_REG_IMM (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, iregs), 0);
337 /* Arg 2: code (next address to the instruction that called us) */
338 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
339 ARM_MOV_REG_IMM8 (code, ARMREG_R1, 0);
341 ARM_MOV_REG_REG (code, ARMREG_R1, ARMREG_V3);
344 /* Arg 3: the specific argument, stored in v2
346 ARM_MOV_REG_REG (code, ARMREG_R2, ARMREG_V2);
349 char *icall_name = g_strdup_printf ("trampoline_func_%d", tramp_type);
350 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, icall_name);
351 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
353 *(gpointer*)code = NULL;
355 ARM_LDR_REG_REG (code, ARMREG_IP, ARMREG_PC, ARMREG_IP);
357 #ifdef USE_JUMP_TABLES
358 load_trampoline = mono_jumptable_add_entry ();
359 code = mono_arm_load_jumptable_entry (code, load_trampoline, ARMREG_IP);
361 load_trampoline = code;
366 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
367 code = emit_bx (code, ARMREG_IP);
369 /* OK, code address is now on r0. Move it to the place on the stack
370 * where IP was saved (it is now no more useful to us and it can be
371 * clobbered). This way we can just restore all the regs in one inst
374 ARM_STR_IMM (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, iregs) + (ARMREG_R12 * sizeof (mgreg_t)));
376 /* Check for thread interruption */
377 /* This is not perf critical code so no need to check the interrupt flag */
379 * Have to call the _force_ variant, since there could be a protected wrapper on the top of the stack.
382 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_force_interruption_checkpoint");
383 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
385 *(gpointer*)code = NULL;
387 ARM_LDR_REG_REG (code, ARMREG_IP, ARMREG_PC, ARMREG_IP);
389 #ifdef USE_JUMP_TABLES
390 gpointer *jte = mono_jumptable_add_entry ();
391 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_IP);
392 jte [0] = mono_thread_force_interruption_checkpoint;
394 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
396 *(gpointer*)code = mono_thread_force_interruption_checkpoint;
400 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
401 code = emit_bx (code, ARMREG_IP);
404 * Now we restore the MonoLMF (see emit_epilogue in mini-arm.c)
405 * and the rest of the registers, so the method called will see
406 * the same state as before we executed.
408 /* ip = previous_lmf */
409 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
411 ARM_LDR_IMM (code, ARMREG_LR, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, lmf_addr));
412 /* *(lmf_addr) = previous_lmf */
413 ARM_STR_IMM (code, ARMREG_IP, ARMREG_LR, MONO_STRUCT_OFFSET (MonoLMF, previous_lmf));
415 /* Restore VFP registers. */
416 if (mono_arm_is_hard_float ()) {
417 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_V1, MONO_STRUCT_OFFSET (MonoLMF, fregs));
418 ARM_FLDMD (code, ARM_VFP_D0, 8, ARMREG_R0);
421 /* Non-standard function epilogue. Instead of doing a proper
422 * return, we just jump to the compiled code.
424 /* Restore the registers and jump to the code:
425 * Note that IP has been conveniently set to the method addr.
427 ARM_ADD_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, STACK - regsave_size);
428 ARM_POP_NWB (code, 0x5fff);
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 if (MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type))
433 code = emit_bx (code, ARMREG_LR);
435 code = emit_bx (code, ARMREG_IP);
437 #ifdef USE_JUMP_TABLES
438 load_get_lmf_addr [0] = mono_get_lmf_addr;
439 load_trampoline [0] = (gpointer)mono_get_trampoline_func (tramp_type);
441 constants = (gpointer*)code;
442 constants [0] = mono_get_lmf_addr;
443 constants [1] = (gpointer)mono_get_trampoline_func (tramp_type);
446 /* backpatch by emitting the missing instructions skipped above */
447 ARM_LDR_IMM (load_get_lmf_addr, ARMREG_R0, ARMREG_PC, (code - load_get_lmf_addr - 8));
448 ARM_LDR_IMM (load_trampoline, ARMREG_IP, ARMREG_PC, (code + 4 - load_trampoline - 8));
454 /* Flush instruction cache, since we've generated code */
455 mono_arch_flush_icache (buf, code - buf);
456 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
459 g_assert ((code - buf) <= buf_len);
462 tramp_name = mono_get_generic_trampoline_name (tramp_type);
463 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
469 #define SPEC_TRAMP_SIZE 24
472 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
474 guint8 *code, *buf, *tramp;
476 #ifndef USE_JUMP_TABLES
477 guint32 short_branch = FALSE;
479 guint32 size = SPEC_TRAMP_SIZE;
481 tramp = mono_get_trampoline_code (tramp_type);
484 mono_domain_lock (domain);
485 #ifdef USE_JUMP_TABLES
486 code = buf = mono_domain_code_reserve_align (domain, size, 4);
488 code = buf = mono_domain_code_reserve_align (domain, size, 4);
489 if ((short_branch = branch_for_target_reachable (code + 4, tramp))) {
491 mono_domain_code_commit (domain, code, SPEC_TRAMP_SIZE, size);
494 mono_domain_unlock (domain);
496 code = buf = mono_global_codeman_reserve (size);
497 short_branch = FALSE;
500 #ifdef USE_JUMP_TABLES
501 /* For jumptables case we always generate the same code for trampolines,
503 * push {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, lr}
509 ARM_PUSH (code, 0x5fff);
510 constants = mono_jumptable_add_entries (2);
511 code = mono_arm_load_jumptable_entry_addr (code, constants, ARMREG_LR);
512 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_LR, 4);
513 code = emit_bx (code, ARMREG_R1);
514 constants [0] = arg1;
515 constants [1] = tramp;
517 /* we could reduce this to 12 bytes if tramp is within reach:
521 * The called code can access method using the lr register
522 * A 20 byte sequence could be:
524 * ARM_MOV_REG_REG (lr, pc)
525 * ARM_LDR_IMM (pc, pc, 0)
529 /* We save all the registers, except PC and SP */
530 ARM_PUSH (code, 0x5fff);
532 constants = (gpointer*)code;
533 constants [0] = GUINT_TO_POINTER (short_branch | (1 << 24));
534 constants [1] = arg1;
537 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 8); /* temp reg */
538 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_PC);
539 code = emit_bx (code, ARMREG_R1);
541 constants = (gpointer*)code;
542 constants [0] = arg1;
543 constants [1] = tramp;
548 /* Flush instruction cache, since we've generated code */
549 mono_arch_flush_icache (buf, code - buf);
550 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_SPECIFIC_TRAMPOLINE, mono_get_generic_trampoline_simple_name (tramp_type));
552 g_assert ((code - buf) <= size);
555 *code_len = code - buf;
561 * mono_arch_get_unbox_trampoline:
563 * @addr: pointer to native code for @m
565 * when value type methods are called through the vtable we need to unbox the
566 * this argument. This method returns a pointer to a trampoline which does
567 * unboxing before calling the method
570 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
572 guint8 *code, *start;
573 MonoDomain *domain = mono_domain_get ();
574 #ifdef USE_JUMP_TABLES
581 start = code = mono_domain_code_reserve (domain, size);
583 #ifdef USE_JUMP_TABLES
584 jte = mono_jumptable_add_entry ();
585 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_IP);
586 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_R0, sizeof (MonoObject));
587 code = emit_bx (code, ARMREG_IP);
590 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 4);
591 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_R0, sizeof (MonoObject));
592 code = emit_bx (code, ARMREG_IP);
593 *(guint32*)code = (guint32)addr;
596 mono_arch_flush_icache (start, code - start);
597 mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_UNBOX_TRAMPOLINE, m);
598 g_assert ((code - start) <= size);
599 /*g_print ("unbox trampoline at %d for %s:%s\n", this_pos, m->klass->name, m->name);
600 g_print ("unbox code is at %p for method at %p\n", start, addr);*/
606 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
608 guint8 *code, *start;
609 #ifdef USE_JUMP_TABLES
615 MonoDomain *domain = mono_domain_get ();
617 start = code = mono_domain_code_reserve (domain, buf_len);
619 #ifdef USE_JUMP_TABLES
620 jte = mono_jumptable_add_entries (2);
621 code = mono_arm_load_jumptable_entry_addr (code, jte, ARMREG_IP);
622 ARM_LDR_IMM (code, MONO_ARCH_RGCTX_REG, ARMREG_IP, 0);
623 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_IP, 4);
624 ARM_BX (code, ARMREG_IP);
628 ARM_LDR_IMM (code, MONO_ARCH_RGCTX_REG, ARMREG_PC, 0);
629 ARM_LDR_IMM (code, ARMREG_PC, ARMREG_PC, 0);
630 *(guint32*)code = (guint32)mrgctx;
632 *(guint32*)code = (guint32)addr;
636 g_assert ((code - start) <= buf_len);
638 mono_arch_flush_icache (start, code - start);
639 mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
641 mono_tramp_info_register (mono_tramp_info_create (NULL, start, code - start, NULL, NULL));
647 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
653 guint8 **rgctx_null_jumps;
657 MonoJumpInfo *ji = NULL;
658 GSList *unwind_ops = NULL;
659 #ifdef USE_JUMP_TABLES
663 mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
664 index = MONO_RGCTX_SLOT_INDEX (slot);
666 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
667 for (depth = 0; ; ++depth) {
668 int size = mono_class_rgctx_get_array_size (depth, mrgctx);
670 if (index < size - 1)
675 tramp_size = 64 + 16 * depth;
677 code = buf = mono_global_codeman_reserve (tramp_size);
679 mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, 0);
681 rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
684 /* The vtable/mrgctx is in R0 */
685 g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
689 ARM_MOV_REG_REG (code, ARMREG_R1, ARMREG_R0);
691 /* load rgctx ptr from vtable */
692 g_assert (arm_is_imm12 (MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context)));
693 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R0, MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context));
694 /* is the rgctx ptr null? */
695 ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
696 /* if yes, jump to actual trampoline */
697 rgctx_null_jumps [njumps ++] = code;
698 ARM_B_COND (code, ARMCOND_EQ, 0);
701 for (i = 0; i < depth; ++i) {
702 /* load ptr to next array */
703 if (mrgctx && i == 0) {
704 g_assert (arm_is_imm12 (MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT));
705 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R1, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT);
707 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R1, 0);
709 /* is the ptr null? */
710 ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
711 /* if yes, jump to actual trampoline */
712 rgctx_null_jumps [njumps ++] = code;
713 ARM_B_COND (code, ARMCOND_EQ, 0);
717 code = mono_arm_emit_load_imm (code, ARMREG_R2, sizeof (gpointer) * (index + 1));
718 ARM_LDR_REG_REG (code, ARMREG_R1, ARMREG_R1, ARMREG_R2);
719 /* is the slot null? */
720 ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
721 /* if yes, jump to actual trampoline */
722 rgctx_null_jumps [njumps ++] = code;
723 ARM_B_COND (code, ARMCOND_EQ, 0);
724 /* otherwise return, result is in R1 */
725 ARM_MOV_REG_REG (code, ARMREG_R0, ARMREG_R1);
726 code = emit_bx (code, ARMREG_LR);
728 g_assert (njumps <= depth + 2);
729 for (i = 0; i < njumps; ++i)
730 arm_patch (rgctx_null_jumps [i], code);
732 g_free (rgctx_null_jumps);
736 /* The vtable/mrgctx is still in R0 */
739 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
740 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 0);
742 *(gpointer*)code = NULL;
744 ARM_LDR_REG_REG (code, ARMREG_PC, ARMREG_PC, ARMREG_R1);
746 tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), &code_len);
748 /* Jump to the actual trampoline */
749 #ifdef USE_JUMP_TABLES
750 jte = mono_jumptable_add_entry ();
752 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_R1);
753 code = emit_bx (code, ARMREG_R1);
755 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 0); /* temp reg */
756 code = emit_bx (code, ARMREG_R1);
757 *(gpointer*)code = tramp;
762 mono_arch_flush_icache (buf, code - buf);
763 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
765 g_assert (code - buf <= tramp_size);
767 char *name = mono_get_rgctx_fetch_trampoline_name (slot);
768 *info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);
775 mono_arch_create_general_rgctx_lazy_fetch_trampoline (MonoTrampInfo **info, gboolean aot)
779 MonoJumpInfo *ji = NULL;
780 GSList *unwind_ops = NULL;
786 code = buf = mono_global_codeman_reserve (tramp_size);
788 mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, 0);
790 // FIXME: Currently, we always go to the slow path.
791 /* Load trampoline addr */
792 ARM_LDR_IMM (code, ARMREG_R1, MONO_ARCH_RGCTX_REG, 4);
793 /* The vtable/mrgctx is in R0 */
794 g_assert (MONO_ARCH_VTABLE_REG == ARMREG_R0);
795 code = emit_bx (code, ARMREG_R1);
797 mono_arch_flush_icache (buf, code - buf);
798 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
800 g_assert (code - buf <= tramp_size);
802 *info = mono_tramp_info_create ("rgctx_fetch_trampoline_general", buf, code - buf, ji, unwind_ops);
808 handler_block_trampoline_helper (gpointer *ptr)
810 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
811 return jit_tls->handler_block_return_address;
815 mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
820 MonoJumpInfo *ji = NULL;
821 GSList *unwind_ops = NULL;
825 code = buf = mono_global_codeman_reserve (tramp_size);
827 tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD, NULL, NULL);
830 This trampoline restore the call chain of the handler block then jumps into the code that deals with it.
834 * We are in a method frame after the call emitted by OP_CALL_HANDLER.
836 /* Obtain jit_tls->handler_block_return_address */
837 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_PC, 0);
839 *(gpointer*)code = handler_block_trampoline_helper;
842 /* Set it as the return address so the trampoline will return to it */
843 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_R0);
845 /* Call the trampoline */
846 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_PC, 0);
847 code = emit_bx (code, ARMREG_R0);
848 *(gpointer*)code = tramp;
851 mono_arch_flush_icache (buf, code - buf);
852 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
853 g_assert (code - buf <= tramp_size);
855 *info = mono_tramp_info_create ("handler_block_trampoline", buf, code - buf, ji, unwind_ops);
861 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
864 GSList *unwind_ops = NULL;
865 MonoJumpInfo *ji = NULL;
868 buf = code = mono_global_codeman_reserve (96);
871 * Construct the MonoContext structure on the stack.
874 frame_size = sizeof (MonoContext);
875 frame_size = ALIGN_TO (frame_size, MONO_ARCH_FRAME_ALIGNMENT);
876 ARM_SUB_REG_IMM8 (code, ARMREG_SP, ARMREG_SP, frame_size);
878 /* save ip, lr and pc into their correspodings ctx.regs slots. */
879 ARM_STR_IMM (code, ARMREG_IP, ARMREG_SP, MONO_STRUCT_OFFSET (MonoContext, regs) + sizeof (mgreg_t) * ARMREG_IP);
880 ARM_STR_IMM (code, ARMREG_LR, ARMREG_SP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_LR);
881 ARM_STR_IMM (code, ARMREG_LR, ARMREG_SP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_PC);
883 /* save r0..r10 and fp */
884 ARM_ADD_REG_IMM8 (code, ARMREG_IP, ARMREG_SP, MONO_STRUCT_OFFSET (MonoContext, regs));
885 ARM_STM (code, ARMREG_IP, 0x0fff);
887 /* now we can update fp. */
888 ARM_MOV_REG_REG (code, ARMREG_FP, ARMREG_SP);
890 /* make ctx.esp hold the actual value of sp at the beginning of this method. */
891 ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_FP, frame_size);
892 ARM_STR_IMM (code, ARMREG_R0, ARMREG_IP, 4 * ARMREG_SP);
893 ARM_STR_IMM (code, ARMREG_R0, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_SP);
895 /* make ctx.eip hold the address of the call. */
896 ARM_SUB_REG_IMM8 (code, ARMREG_LR, ARMREG_LR, 4);
897 ARM_STR_IMM (code, ARMREG_LR, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, pc));
899 /* r0 now points to the MonoContext */
900 ARM_MOV_REG_REG (code, ARMREG_R0, ARMREG_FP);
904 #ifdef USE_JUMP_TABLES
906 gpointer *jte = mono_jumptable_add_entry ();
907 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_IP);
911 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
914 *(gpointer*)code = debugger_agent_single_step_from_context;
916 *(gpointer*)code = debugger_agent_breakpoint_from_context;
919 ARM_BLX_REG (code, ARMREG_IP);
921 /* we're back; save ctx.eip and ctx.esp into the corresponding regs slots. */
922 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, pc));
923 ARM_STR_IMM (code, ARMREG_R0, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_LR);
924 ARM_STR_IMM (code, ARMREG_R0, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, regs) + 4 * ARMREG_PC);
926 /* make ip point to the regs array, then restore everything, including pc. */
927 ARM_ADD_REG_IMM8 (code, ARMREG_IP, ARMREG_FP, MONO_STRUCT_OFFSET (MonoContext, regs));
928 ARM_LDM (code, ARMREG_IP, 0xffff);
930 mono_arch_flush_icache (buf, code - buf);
931 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
933 const char *tramp_name = single_step ? "sdb_single_step_trampoline" : "sdb_breakpoint_trampoline";
934 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
942 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
944 g_assert_not_reached ();
949 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
951 g_assert_not_reached ();
956 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
958 g_assert_not_reached ();
963 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
965 g_assert_not_reached ();
970 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
972 g_assert_not_reached ();
977 mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
979 g_assert_not_reached ();
984 mono_arch_create_sdb_trampoline (gboolean single_step, MonoTrampInfo **info, gboolean aot)
986 g_assert_not_reached ();
990 #endif /* DISABLE_JIT */
993 mono_arch_get_call_target (guint8 *code)
995 guint32 ins = ((guint32*)(gpointer)code) [-1];
998 /* Should be a 'bl' or a 'b' */
999 if (((ins >> 25) & 0x7) == 0x5) {
1001 /* Should be a 'bl' */
1002 if ((((ins >> 25) & 0x7) == 0x5) && (((ins >> 24) & 0x1) == 0x1)) {
1004 gint32 disp = ((((gint32)ins) & 0xffffff) << 8) >> 8;
1005 guint8 *target = code - 4 + 8 + (disp * 4);
1014 mono_arch_get_plt_info_offset (guint8 *plt_entry, mgreg_t *regs, guint8 *code)
1016 /* The offset is stored as the 4th word of the plt entry */
1017 return ((guint32*)plt_entry) [3];
1021 * Return the address of the PLT entry called by the thumb code CODE.
1024 mono_arm_get_thumb_plt_entry (guint8 *code)
1026 int s, j1, j2, imm10, imm11, i1, i2, imm32;
1031 /* code should be right after a BL */
1032 code = (guint8*)((mgreg_t)code & ~1);
1033 base = (guint8*)((mgreg_t)code & ~3);
1035 t1 = ((guint16*)bl) [0];
1036 t2 = ((guint16*)bl) [1];
1038 g_assert ((t1 >> 11) == 0x1e);
1040 s = (t1 >> 10) & 0x1;
1041 imm10 = (t1 >> 0) & 0x3ff;
1042 j1 = (t2 >> 13) & 0x1;
1043 j2 = (t2 >> 11) & 0x1;
1046 i1 = (s ^ j1) ? 0 : 1;
1047 i2 = (s ^ j2) ? 0 : 1;
1049 imm32 = (imm11 << 1) | (imm10 << 12) | (i2 << 22) | (i1 << 23);
1051 /* Sign extend from 24 bits to 32 bits */
1052 imm32 = ((gint32)imm32 << 8) >> 8;
1054 target = code + imm32;
1056 /* target now points to the thumb plt entry */
1057 /* ldr.w r12, [pc, #8] */
1058 g_assert (((guint16*)target) [0] == 0xf8df);
1059 g_assert (((guint16*)target) [1] == 0xc008);
1062 * The PLT info offset is at offset 16, but mono_arch_get_plt_entry_offset () returns
1063 * the 3rd word, so compensate by returning a different value.
1073 * mono_arch_get_gsharedvt_arg_trampoline:
1075 * See tramp-x86.c for documentation.
1078 mono_arch_get_gsharedvt_arg_trampoline (MonoDomain *domain, gpointer arg, gpointer addr)
1082 gpointer *constants;
1086 buf = code = mono_domain_code_reserve (domain, buf_len);
1088 /* Similar to the specialized trampoline code */
1089 ARM_PUSH (code, (1 << ARMREG_R0) | (1 << ARMREG_R1) | (1 << ARMREG_R2) | (1 << ARMREG_R3) | (1 << ARMREG_LR));
1090 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 8);
1091 /* arg is passed in LR */
1092 ARM_LDR_IMM (code, ARMREG_LR, ARMREG_PC, 0);
1093 code = emit_bx (code, ARMREG_IP);
1094 constants = (gpointer*)code;
1095 constants [0] = arg;
1096 constants [1] = addr;
1099 g_assert ((code - buf) <= buf_len);
1101 nacl_domain_code_validate (domain, &buf, buf_len, &code);
1102 mono_arch_flush_icache (buf, code - buf);
1103 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
1111 mono_arch_get_gsharedvt_arg_trampoline (MonoDomain *domain, gpointer arg, gpointer addr)
1113 g_assert_not_reached ();
1119 #if defined(ENABLE_GSHAREDVT)
1121 #include "../../../mono-extensions/mono/mini/tramp-arm-gsharedvt.c"
1126 mono_arm_start_gsharedvt_call (GSharedVtCallInfo *info, gpointer *caller, gpointer *callee, gpointer mrgctx_reg)
1128 g_assert_not_reached ();
1133 mono_arch_get_gsharedvt_trampoline (MonoTrampInfo **info, gboolean aot)
1139 #endif /* !MONOTOUCH */