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>
26 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
28 #ifdef USE_JUMP_TABLES
31 decode_imm16 (guint32 insn)
33 return (((insn >> 16) & 0xf) << 12) | (insn & 0xfff);
36 #define INSN_MASK 0xff00000
37 #define MOVW_MASK ((3 << 24) | (0 << 20))
38 #define MOVT_MASK ((3 << 24) | (4 << 20))
41 mono_arch_jumptable_entry_from_code (guint8 *code)
43 guint32 insn1 = ((guint32*)code) [0];
44 guint32 insn2 = ((guint32*)code) [1];
46 if (((insn1 & INSN_MASK) == MOVW_MASK) &&
47 ((insn2 & INSN_MASK) == MOVT_MASK) ) {
48 guint32 imm_lo = decode_imm16 (insn1);
49 guint32 imm_hi = decode_imm16 (insn2);
50 return (gpointer*) GUINT_TO_POINTER (imm_lo | (imm_hi << 16));
52 g_assert_not_reached ();
62 mono_arch_patch_callsite (guint8 *method_start, guint8 *code_ptr, guint8 *addr)
66 * code_ptr is 4 instructions after MOVW/MOVT used to address
69 jte = mono_jumptable_get_entry (code_ptr - 16);
70 g_assert ( jte != NULL);
75 mono_arch_patch_callsite (guint8 *method_start, guint8 *code_ptr, guint8 *addr)
77 guint32 *code = (guint32*)code_ptr;
79 /* This is the 'bl' or the 'mov pc' instruction */
83 * Note that methods are called also with the bl opcode.
85 if ((((*code) >> 25) & 7) == 5) {
86 /*g_print ("direct patching\n");*/
87 arm_patch ((guint8*)code, addr);
88 mono_arch_flush_icache ((guint8*)code, 4);
92 if ((((*code) >> 20) & 0xFF) == 0x12) {
93 /*g_print ("patching bx\n");*/
94 arm_patch ((guint8*)code, addr);
95 mono_arch_flush_icache ((guint8*)(code - 2), 4);
99 g_assert_not_reached ();
104 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
108 /* Patch the jump table entry used by the plt entry */
109 if (*(guint32*)code == 0xe59fc000) {
110 /* ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0); */
111 guint32 offset = ((guint32*)code)[2];
113 jump_entry = code + offset + 12;
114 } else if (*(guint16*)(code - 4) == 0xf8df) {
116 * Thumb PLT entry, begins with ldr.w ip, [pc, #8], code points to entry + 4, see
117 * mono_arm_get_thumb_plt_entry ().
122 offset = *(guint32*)(code + 12);
123 jump_entry = code + offset + 8;
125 g_assert_not_reached ();
128 *(guint8**)jump_entry = addr;
132 mono_arch_nullify_class_init_trampoline (guint8 *code, mgreg_t *regs)
134 mono_arch_patch_callsite (NULL, code, mini_get_nullified_class_init_trampoline ());
139 #define arm_is_imm12(v) ((int)(v) > -4096 && (int)(v) < 4096)
141 #ifndef USE_JUMP_TABLES
143 * Return the instruction to jump from code to target, 0 if not
144 * reachable with a single instruction
147 branch_for_target_reachable (guint8 *branch, guint8 *target)
149 gint diff = target - branch - 8;
150 g_assert ((diff & 3) == 0);
152 if (diff <= 33554431)
153 return (ARMCOND_AL << ARMCOND_SHIFT) | (ARM_BR_TAG) | (diff >> 2);
155 /* diff between 0 and -33554432 */
156 if (diff >= -33554432)
157 return (ARMCOND_AL << ARMCOND_SHIFT) | (ARM_BR_TAG) | ((diff >> 2) & ~0xff000000);
163 static inline guint8*
164 emit_bx (guint8* code, int reg)
166 if (mono_arm_thumb_supported ())
169 ARM_MOV_REG_REG (code, ARMREG_PC, reg);
173 /* Stack size for trampoline function
175 #define STACK ALIGN_TO (sizeof (MonoLMF), 8)
177 /* Method-specific trampoline code fragment size */
178 #define METHOD_TRAMPOLINE_SIZE 64
180 /* Jump-specific trampoline code fragment size */
181 #define JUMP_TRAMPOLINE_SIZE 64
184 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
187 guint8 *buf, *code = NULL;
188 #ifdef USE_JUMP_TABLES
189 gpointer *load_get_lmf_addr = NULL, *load_trampoline = NULL;
191 guint8 *load_get_lmf_addr = NULL, *load_trampoline = NULL;
195 int cfa_offset, regsave_size, lr_offset;
196 GSList *unwind_ops = NULL;
197 MonoJumpInfo *ji = NULL;
200 #ifdef USE_JUMP_TABLES
204 /* Now we'll create in 'buf' the ARM trampoline code. This
205 is the trampoline code common to all methods */
209 /* Add space for saving/restoring VFP regs. */
210 if (mono_arm_is_hard_float ())
213 code = buf = mono_global_codeman_reserve (buf_len);
216 * At this point lr points to the specific arg and sp points to the saved
217 * regs on the stack (all but PC and SP). The original LR value has been
218 * saved as sp + LR_OFFSET by the push in the specific trampoline
221 /* The size of the area already allocated by the push in the specific trampoline */
222 regsave_size = 14 * sizeof (mgreg_t);
223 /* The offset where lr was saved inside the regsave area */
224 lr_offset = 13 * sizeof (mgreg_t);
226 // FIXME: Finish the unwind info, the current info allows us to unwind
227 // when the trampoline is not in the epilog
229 // CFA = SP + (num registers pushed) * 4
230 cfa_offset = 14 * sizeof (mgreg_t);
231 mono_add_unwind_op_def_cfa (unwind_ops, code, buf, ARMREG_SP, cfa_offset);
232 // PC saved at sp+LR_OFFSET
233 mono_add_unwind_op_offset (unwind_ops, code, buf, ARMREG_LR, -4);
235 if (aot && tramp_type != MONO_TRAMPOLINE_GENERIC_CLASS_INIT) {
237 * For page trampolines the data is in r1, so just move it, otherwise use the got slot as below.
238 * The trampoline contains a pc-relative offset to the got slot
239 * preceeding the got slot where the value is stored. The offset can be
243 ARM_MOV_REG_REG (code, ARMREG_V2, ARMREG_R1);
245 ARM_LDR_IMM (code, ARMREG_V2, ARMREG_LR, 0);
246 ARM_ADD_REG_IMM (code, ARMREG_V2, ARMREG_V2, 4, 0);
247 ARM_LDR_REG_REG (code, ARMREG_V2, ARMREG_V2, ARMREG_LR);
250 if (tramp_type != MONO_TRAMPOLINE_GENERIC_CLASS_INIT) {
251 ARM_LDR_IMM (code, ARMREG_V2, ARMREG_LR, 0);
254 ARM_MOV_REG_REG (code, ARMREG_V2, MONO_ARCH_VTABLE_REG);
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 ((tramp_type == MONO_TRAMPOLINE_CLASS_INIT) || (tramp_type == MONO_TRAMPOLINE_GENERIC_CLASS_INIT) || (tramp_type == MONO_TRAMPOLINE_RGCTX_LAZY_FETCH))
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);
831 #define arm_is_imm8(v) ((v) > -256 && (v) < 256)
834 mono_arch_create_generic_class_init_trampoline (MonoTrampInfo **info, gboolean aot)
838 static int byte_offset = -1;
839 static guint8 bitmask;
842 guint32 code_len, imm8;
844 GSList *unwind_ops = NULL;
845 MonoJumpInfo *ji = NULL;
849 code = buf = mono_global_codeman_reserve (tramp_size);
852 mono_marshal_find_bitfield_offset (MonoVTable, initialized, &byte_offset, &bitmask);
854 g_assert (arm_is_imm8 (byte_offset));
855 ARM_LDRSB_IMM (code, ARMREG_IP, MONO_ARCH_VTABLE_REG, byte_offset);
856 imm8 = mono_arm_is_rotated_imm8 (bitmask, &rot_amount);
857 g_assert (imm8 >= 0);
858 ARM_AND_REG_IMM (code, ARMREG_IP, ARMREG_IP, imm8, rot_amount);
859 ARM_CMP_REG_IMM (code, ARMREG_IP, 0, 0);
861 ARM_B_COND (code, ARMCOND_EQ, 0);
863 /* Initialized case */
864 ARM_MOV_REG_REG (code, ARMREG_PC, ARMREG_LR);
866 /* Uninitialized case */
867 arm_patch (jump, code);
870 ji = mono_patch_info_list_prepend (ji, code - buf, MONO_PATCH_INFO_JIT_ICALL_ADDR, "specific_trampoline_generic_class_init");
871 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 0);
873 *(gpointer*)code = NULL;
875 ARM_LDR_REG_REG (code, ARMREG_PC, ARMREG_PC, ARMREG_R1);
877 #ifdef USE_JUMP_TABLES
878 gpointer *jte = mono_jumptable_add_entry ();
880 tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_GENERIC_CLASS_INIT, mono_get_root_domain (), &code_len);
882 /* Jump to the actual trampoline */
883 #ifdef USE_JUMP_TABLES
884 code = mono_arm_load_jumptable_entry (code, jte, ARMREG_R1);
886 code = emit_bx (code, ARMREG_R1);
888 ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 0); /* temp reg */
889 code = emit_bx (code, ARMREG_R1);
890 *(gpointer*)code = tramp;
895 mono_arch_flush_icache (buf, code - buf);
896 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
898 g_assert (code - buf <= tramp_size);
900 *info = mono_tramp_info_create ("generic_class_init_trampoline", buf, code - buf, ji, unwind_ops);
906 handler_block_trampoline_helper (gpointer *ptr)
908 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
909 return jit_tls->handler_block_return_address;
913 mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
918 MonoJumpInfo *ji = NULL;
919 GSList *unwind_ops = NULL;
923 code = buf = mono_global_codeman_reserve (tramp_size);
925 tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD, NULL, NULL);
928 This trampoline restore the call chain of the handler block then jumps into the code that deals with it.
932 * We are in a method frame after the call emitted by OP_CALL_HANDLER.
934 /* Obtain jit_tls->handler_block_return_address */
935 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_PC, 0);
937 *(gpointer*)code = handler_block_trampoline_helper;
940 /* Set it as the return address so the trampoline will return to it */
941 ARM_MOV_REG_REG (code, ARMREG_LR, ARMREG_R0);
943 /* Call the trampoline */
944 ARM_LDR_IMM (code, ARMREG_R0, ARMREG_PC, 0);
945 code = emit_bx (code, ARMREG_R0);
946 *(gpointer*)code = tramp;
949 mono_arch_flush_icache (buf, code - buf);
950 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_HELPER, NULL);
951 g_assert (code - buf <= tramp_size);
953 *info = mono_tramp_info_create ("handler_block_trampoline", buf, code - buf, ji, unwind_ops);
961 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
963 g_assert_not_reached ();
968 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
970 g_assert_not_reached ();
975 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
977 g_assert_not_reached ();
982 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
984 g_assert_not_reached ();
989 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
991 g_assert_not_reached ();
996 mono_arch_create_generic_class_init_trampoline (MonoTrampInfo **info, gboolean aot)
998 g_assert_not_reached ();
1003 mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
1005 g_assert_not_reached ();
1010 mono_arch_create_handler_block_trampoline (MonoTrampInfo **info, gboolean aot)
1012 g_assert_not_reached ();
1016 #endif /* DISABLE_JIT */
1019 mono_arch_get_call_target (guint8 *code)
1021 guint32 ins = ((guint32*)(gpointer)code) [-1];
1024 /* Should be a 'bl' or a 'b' */
1025 if (((ins >> 25) & 0x7) == 0x5) {
1027 /* Should be a 'bl' */
1028 if ((((ins >> 25) & 0x7) == 0x5) && (((ins >> 24) & 0x1) == 0x1)) {
1030 gint32 disp = ((((gint32)ins) & 0xffffff) << 8) >> 8;
1031 guint8 *target = code - 4 + 8 + (disp * 4);
1040 mono_arch_get_plt_info_offset (guint8 *plt_entry, mgreg_t *regs, guint8 *code)
1042 /* The offset is stored as the 4th word of the plt entry */
1043 return ((guint32*)plt_entry) [3];
1047 * Return the address of the PLT entry called by the thumb code CODE.
1050 mono_arm_get_thumb_plt_entry (guint8 *code)
1052 int s, j1, j2, imm10, imm11, i1, i2, imm32;
1057 /* code should be right after a BL */
1058 code = (guint8*)((mgreg_t)code & ~1);
1059 base = (guint8*)((mgreg_t)code & ~3);
1061 t1 = ((guint16*)bl) [0];
1062 t2 = ((guint16*)bl) [1];
1064 g_assert ((t1 >> 11) == 0x1e);
1066 s = (t1 >> 10) & 0x1;
1067 imm10 = (t1 >> 0) & 0x3ff;
1068 j1 = (t2 >> 13) & 0x1;
1069 j2 = (t2 >> 11) & 0x1;
1072 i1 = (s ^ j1) ? 0 : 1;
1073 i2 = (s ^ j2) ? 0 : 1;
1075 imm32 = (imm11 << 1) | (imm10 << 12) | (i2 << 22) | (i1 << 23);
1077 /* Sign extend from 24 bits to 32 bits */
1078 imm32 = ((gint32)imm32 << 8) >> 8;
1080 target = code + imm32;
1082 /* target now points to the thumb plt entry */
1083 /* ldr.w r12, [pc, #8] */
1084 g_assert (((guint16*)target) [0] == 0xf8df);
1085 g_assert (((guint16*)target) [1] == 0xc008);
1088 * The PLT info offset is at offset 16, but mono_arch_get_plt_entry_offset () returns
1089 * the 3rd word, so compensate by returning a different value.
1099 * mono_arch_get_gsharedvt_arg_trampoline:
1101 * See tramp-x86.c for documentation.
1104 mono_arch_get_gsharedvt_arg_trampoline (MonoDomain *domain, gpointer arg, gpointer addr)
1108 gpointer *constants;
1112 buf = code = mono_domain_code_reserve (domain, buf_len);
1114 /* Similar to the specialized trampoline code */
1115 ARM_PUSH (code, (1 << ARMREG_R0) | (1 << ARMREG_R1) | (1 << ARMREG_R2) | (1 << ARMREG_R3) | (1 << ARMREG_LR));
1116 ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 8);
1117 /* arg is passed in LR */
1118 ARM_LDR_IMM (code, ARMREG_LR, ARMREG_PC, 0);
1119 code = emit_bx (code, ARMREG_IP);
1120 constants = (gpointer*)code;
1121 constants [0] = arg;
1122 constants [1] = addr;
1125 g_assert ((code - buf) <= buf_len);
1127 nacl_domain_code_validate (domain, &buf, buf_len, &code);
1128 mono_arch_flush_icache (buf, code - buf);
1129 mono_profiler_code_buffer_new (buf, code - buf, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
1137 mono_arch_get_gsharedvt_arg_trampoline (MonoDomain *domain, gpointer arg, gpointer addr)
1139 g_assert_not_reached ();
1145 #if defined(ENABLE_GSHAREDVT)
1147 #include "../../../mono-extensions/mono/mini/tramp-arm-gsharedvt.c"
1152 mono_arm_start_gsharedvt_call (GSharedVtCallInfo *info, gpointer *caller, gpointer *callee, gpointer mrgctx_reg)
1154 g_assert_not_reached ();
1159 mono_arch_get_gsharedvt_trampoline (MonoTrampInfo **info, gboolean aot)
1165 #endif /* !MONOTOUCH */