2 * tramp-ppc.c: JIT trampoline code for PowerPC
5 * Dietmar Maurer (dietmar@ximian.com)
6 * Paolo Molaro (lupus@ximian.com)
7 * Carlos Valiente <yo@virutass.net>
8 * Andreas Faerber <andreas.faerber@web.de>
10 * (C) 2001 Ximian, Inc.
11 * (C) 2007-2008 Andreas Faerber
17 #include <mono/metadata/appdomain.h>
18 #include <mono/metadata/marshal.h>
19 #include <mono/metadata/tabledefs.h>
20 #include <mono/arch/ppc/ppc-codegen.h>
26 /* Same as mono_create_ftnptr, but doesn't require a domain */
28 mono_ppc_create_ftnptr (guint8 *code)
30 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
31 MonoPPCFunctionDescriptor *ftnptr = mono_global_codeman_reserve (sizeof (MonoPPCFunctionDescriptor));
45 * Return the instruction to jump from code to target, 0 if not
46 * reachable with a single instruction
49 branch_for_target_reachable (guint8 *branch, guint8 *target)
51 gint diff = target - branch;
52 g_assert ((diff & 3) == 0);
55 return (18 << 26) | (diff);
57 /* diff between 0 and -33554432 */
58 if (diff >= -33554432)
59 return (18 << 26) | (diff & ~0xfc000000);
65 * get_unbox_trampoline:
67 * @addr: pointer to native code for @m
69 * when value type methods are called through the vtable we need to unbox the
70 * this argument. This method returns a pointer to a trampoline which does
71 * unboxing before calling the method
74 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
79 MonoDomain *domain = mono_domain_get ();
80 int size = MONO_PPC_32_64_CASE (20, 32) + PPC_FTNPTR_SIZE;
82 addr = mono_get_addr_from_ftnptr (addr);
84 mono_domain_lock (domain);
85 start = code = mono_domain_code_reserve (domain, size);
86 code = mono_ppc_create_pre_code_ftnptr (code);
87 short_branch = branch_for_target_reachable (code + 4, addr);
89 mono_domain_code_commit (domain, code, size, 8);
90 mono_domain_unlock (domain);
93 ppc_addi (code, this_pos, this_pos, sizeof (MonoObject));
94 ppc_emit32 (code, short_branch);
96 ppc_load_ptr (code, ppc_r0, addr);
97 ppc_mtctr (code, ppc_r0);
98 ppc_addi (code, this_pos, this_pos, sizeof (MonoObject));
99 ppc_bcctr (code, 20, 0);
101 mono_arch_flush_icache (start, code - start);
102 g_assert ((code - start) <= size);
103 /*g_print ("unbox trampoline at %d for %s:%s\n", this_pos, m->klass->name, m->name);
104 g_print ("unbox code is at %p for method at %p\n", start, addr);*/
110 * mono_arch_get_static_rgctx_trampoline:
112 * Create a trampoline which sets RGCTX_REG to MRGCTX, then jumps to ADDR.
115 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
117 guint8 *code, *start, *p;
118 guint8 imm_buf [128];
119 guint32 short_branch;
120 MonoDomain *domain = mono_domain_get ();
122 int size = MONO_PPC_32_64_CASE (24, (PPC_LOAD_SEQUENCE_LENGTH * 2) + 8) + PPC_FTNPTR_SIZE;
124 addr = mono_get_addr_from_ftnptr (addr);
126 /* Compute size of code needed to emit mrgctx */
128 ppc_load_ptr (p, MONO_ARCH_RGCTX_REG, mrgctx);
129 imm_size = p - imm_buf;
131 mono_domain_lock (domain);
132 start = code = mono_domain_code_reserve (domain, size);
133 code = mono_ppc_create_pre_code_ftnptr (code);
134 short_branch = branch_for_target_reachable (code + imm_size, addr);
136 mono_domain_code_commit (domain, code, size, imm_size + 4);
137 mono_domain_unlock (domain);
140 ppc_load_ptr (code, MONO_ARCH_RGCTX_REG, mrgctx);
141 ppc_emit32 (code, short_branch);
143 ppc_load_ptr (code, ppc_r0, addr);
144 ppc_mtctr (code, ppc_r0);
145 ppc_load_ptr (code, MONO_ARCH_RGCTX_REG, mrgctx);
146 ppc_bcctr (code, 20, 0);
148 mono_arch_flush_icache (start, code - start);
149 g_assert ((code - start) <= size);
155 mono_arch_patch_callsite (guint8 *method_start, guint8 *code_ptr, guint8 *addr)
157 guint32 *code = (guint32*)code_ptr;
159 addr = mono_get_addr_from_ftnptr (addr);
161 /* This is the 'blrl' instruction */
165 * Note that methods are called also with the bl opcode.
167 if (((*code) >> 26) == 18) {
168 /*g_print ("direct patching\n");*/
169 ppc_patch ((guint8*)code, addr);
170 mono_arch_flush_icache ((guint8*)code, 4);
175 g_assert (mono_ppc_is_direct_call_sequence (code));
177 ppc_patch ((guint8*)code, addr);
181 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
183 guint32 ins1, ins2, offset;
185 /* Patch the jump table entry used by the plt entry */
187 /* Should be a lis+ori */
188 ins1 = ((guint32*)code)[0];
189 g_assert (ins1 >> 26 == 15);
190 ins2 = ((guint32*)code)[1];
191 g_assert (ins2 >> 26 == 24);
192 offset = ((ins1 & 0xffff) << 16) | (ins2 & 0xffff);
194 /* Either got or regs is set */
196 got = (gpointer*)(gsize) regs [30];
197 *(guint8**)((guint8*)got + offset) = addr;
201 mono_arch_nullify_class_init_trampoline (guint8 *code, mgreg_t *regs)
203 mono_arch_patch_callsite (NULL, code, mini_get_nullified_class_init_trampoline ());
207 mono_arch_nullify_plt_entry (guint8 *code, mgreg_t *regs)
209 mono_arch_patch_plt_entry (code, NULL, regs, mini_get_nullified_class_init_trampoline ());
212 /* Stack size for trampoline function
213 * PPC_MINIMAL_STACK_SIZE + 16 (args + alignment to ppc_magic_trampoline)
214 * + MonoLMF + 14 fp regs + 13 gregs + alignment
216 #define STACK (((PPC_MINIMAL_STACK_SIZE + 4 * sizeof (mgreg_t) + sizeof (MonoLMF) + 14 * sizeof (double) + 31 * sizeof (mgreg_t)) + (MONO_ARCH_FRAME_ALIGNMENT - 1)) & ~(MONO_ARCH_FRAME_ALIGNMENT - 1))
218 /* Method-specific trampoline code fragment size */
219 #define METHOD_TRAMPOLINE_SIZE 64
221 /* Jump-specific trampoline code fragment size */
222 #define JUMP_TRAMPOLINE_SIZE 64
224 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
225 #define PPC_TOC_REG ppc_r2
227 #define PPC_TOC_REG -1
231 * Stack frame description when the generic trampoline is called.
233 * --------------------
235 * -------------------
236 * Saved FP registers 0-13
237 * -------------------
238 * Saved general registers 0-30
239 * -------------------
240 * param area for 3 args to ppc_magic_trampoline
241 * -------------------
243 * -------------------
246 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
249 guint8 *buf, *code = NULL;
251 gconstpointer tramp_handler;
252 int size = MONO_PPC_32_64_CASE (600, 800);
253 GSList *unwind_ops = NULL;
254 MonoJumpInfo *ji = NULL;
256 /* Now we'll create in 'buf' the PowerPC trampoline code. This
257 is the trampoline code common to all methods */
259 code = buf = mono_global_codeman_reserve (size);
261 ppc_str_update (code, ppc_r1, -STACK, ppc_r1);
263 /* start building the MonoLMF on the stack */
264 offset = STACK - sizeof (double) * MONO_SAVED_FREGS;
265 for (i = 14; i < 32; i++) {
266 ppc_stfd (code, i, offset, ppc_r1);
267 offset += sizeof (double);
270 * now the integer registers.
272 offset = STACK - sizeof (MonoLMF) + G_STRUCT_OFFSET (MonoLMF, iregs);
273 ppc_str_multiple (code, ppc_r13, offset, ppc_r1);
275 /* Now save the rest of the registers below the MonoLMF struct, first 14
276 * fp regs and then the 31 gregs.
278 offset = STACK - sizeof (MonoLMF) - (14 * sizeof (double));
279 for (i = 0; i < 14; i++) {
280 ppc_stfd (code, i, offset, ppc_r1);
281 offset += sizeof (double);
283 #define GREGS_OFFSET (STACK - sizeof (MonoLMF) - (14 * sizeof (double)) - (31 * sizeof (mgreg_t)))
284 offset = GREGS_OFFSET;
285 for (i = 0; i < 31; i++) {
286 ppc_str (code, i, offset, ppc_r1);
287 offset += sizeof (mgreg_t);
290 /* we got here through a jump to the ctr reg, we must save the lr
291 * in the parent frame (we do it here to reduce the size of the
292 * method-specific trampoline)
294 ppc_mflr (code, ppc_r0);
295 ppc_str (code, ppc_r0, STACK + PPC_RET_ADDR_OFFSET, ppc_r1);
297 /* ok, now we can continue with the MonoLMF setup, mostly untouched
298 * from emit_prolog in mini-ppc.c
301 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
302 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
303 ppc_ldptr (code, ppc_r2, sizeof (gpointer), ppc_r11);
304 ppc_ldptr (code, ppc_r11, 0, ppc_r11);
306 ppc_mtlr (code, ppc_r11);
309 ppc_load_func (code, ppc_r0, mono_get_lmf_addr);
310 ppc_mtlr (code, ppc_r0);
313 /* we build the MonoLMF structure on the stack - see mini-ppc.h
314 * The pointer to the struct is put in ppc_r11.
316 ppc_addi (code, ppc_r11, ppc_sp, STACK - sizeof (MonoLMF));
317 ppc_stptr (code, ppc_r3, G_STRUCT_OFFSET(MonoLMF, lmf_addr), ppc_r11);
318 /* new_lmf->previous_lmf = *lmf_addr */
319 ppc_ldptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r3);
320 ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r11);
321 /* *(lmf_addr) = r11 */
322 ppc_stptr (code, ppc_r11, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r3);
323 /* save method info (it's stored on the stack, so get it first). */
324 if ((tramp_type == MONO_TRAMPOLINE_JIT) || (tramp_type == MONO_TRAMPOLINE_JUMP)) {
325 ppc_ldr (code, ppc_r0, GREGS_OFFSET, ppc_r1);
326 ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, method), ppc_r11);
328 ppc_load (code, ppc_r0, 0);
329 ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, method), ppc_r11);
331 /* store the frame pointer of the calling method */
332 ppc_addi (code, ppc_r0, ppc_sp, STACK);
333 ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, ebp), ppc_r11);
334 /* save the IP (caller ip) */
335 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
336 ppc_li (code, ppc_r0, 0);
338 ppc_ldr (code, ppc_r0, STACK + PPC_RET_ADDR_OFFSET, ppc_r1);
340 ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, eip), ppc_r11);
343 * Now we're ready to call trampoline (mgreg_t *regs, guint8 *code, gpointer value, guint8 *tramp)
344 * Note that the last argument is unused.
346 /* Arg 1: a pointer to the registers */
347 ppc_addi (code, ppc_r3, ppc_r1, GREGS_OFFSET);
349 /* Arg 2: code (next address to the instruction that called us) */
350 if (tramp_type == MONO_TRAMPOLINE_JUMP)
351 ppc_li (code, ppc_r4, 0);
353 ppc_ldr (code, ppc_r4, STACK + PPC_RET_ADDR_OFFSET, ppc_r1);
355 /* Arg 3: trampoline argument */
356 if (tramp_type == MONO_TRAMPOLINE_GENERIC_CLASS_INIT)
357 ppc_ldr (code, ppc_r5, GREGS_OFFSET + MONO_ARCH_VTABLE_REG * sizeof (mgreg_t), ppc_r1);
359 ppc_ldr (code, ppc_r5, GREGS_OFFSET, ppc_r1);
362 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("trampoline_func_%d", tramp_type));
363 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
364 ppc_ldptr (code, ppc_r2, sizeof (gpointer), ppc_r11);
365 ppc_ldptr (code, ppc_r11, 0, ppc_r11);
367 ppc_mtlr (code, ppc_r11);
370 tramp_handler = mono_get_trampoline_func (tramp_type);
371 ppc_load_func (code, ppc_r0, tramp_handler);
372 ppc_mtlr (code, ppc_r0);
376 /* OK, code address is now on r3. Move it to the counter reg
377 * so it will be ready for the final jump: this is safe since we
378 * won't do any more calls.
380 if (!MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type)) {
381 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
382 ppc_ldptr (code, ppc_r2, sizeof (gpointer), ppc_r3);
383 ppc_ldptr (code, ppc_r3, 0, ppc_r3);
385 ppc_mtctr (code, ppc_r3);
389 * Now we restore the MonoLMF (see emit_epilogue in mini-ppc.c)
390 * and the rest of the registers, so the method called will see
391 * the same state as before we executed.
392 * The pointer to MonoLMF is in ppc_r11.
394 ppc_addi (code, ppc_r11, ppc_r1, STACK - sizeof (MonoLMF));
395 /* r5 = previous_lmf */
396 ppc_ldptr (code, ppc_r5, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r11);
398 ppc_ldptr (code, ppc_r6, G_STRUCT_OFFSET(MonoLMF, lmf_addr), ppc_r11);
399 /* *(lmf_addr) = previous_lmf */
400 ppc_stptr (code, ppc_r5, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r6);
402 ppc_ldr_multiple (code, ppc_r13, G_STRUCT_OFFSET(MonoLMF, iregs), ppc_r11);
404 for (i = 14; i < 32; i++)
405 ppc_lfd (code, i, G_STRUCT_OFFSET(MonoLMF, fregs) + ((i-14) * sizeof (gdouble)), ppc_r11);
407 /* restore the volatile registers, we skip r1, of course */
408 offset = STACK - sizeof (MonoLMF) - (14 * sizeof (double));
409 for (i = 0; i < 14; i++) {
410 ppc_lfd (code, i, offset, ppc_r1);
411 offset += sizeof (double);
413 offset = STACK - sizeof (MonoLMF) - (14 * sizeof (double)) - (31 * sizeof (mgreg_t));
414 ppc_ldr (code, ppc_r0, offset, ppc_r1);
415 offset += 2 * sizeof (mgreg_t);
416 for (i = 2; i < 13; i++) {
417 if (i != PPC_TOC_REG && (i != 3 || tramp_type != MONO_TRAMPOLINE_RGCTX_LAZY_FETCH))
418 ppc_ldr (code, i, offset, ppc_r1);
419 offset += sizeof (mgreg_t);
422 /* Non-standard function epilogue. Instead of doing a proper
423 * return, we just jump to the compiled code.
425 /* Restore stack pointer and LR and jump to the code */
426 ppc_ldr (code, ppc_r1, 0, ppc_r1);
427 ppc_ldr (code, ppc_r11, PPC_RET_ADDR_OFFSET, ppc_r1);
428 ppc_mtlr (code, ppc_r11);
429 if (MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type))
432 ppc_bcctr (code, 20, 0);
434 /* Flush instruction cache, since we've generated code */
435 mono_arch_flush_icache (buf, code - buf);
438 g_assert ((code - buf) <= size);
441 tramp_name = mono_get_generic_trampoline_name (tramp_type);
442 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
449 #define TRAMPOLINE_SIZE (MONO_PPC_32_64_CASE (24, (5+5+1+1)*4))
451 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
453 guint8 *code, *buf, *tramp;
454 guint32 short_branch;
456 tramp = mono_get_trampoline_code (tramp_type);
458 mono_domain_lock (domain);
459 code = buf = mono_domain_code_reserve_align (domain, TRAMPOLINE_SIZE, 4);
460 short_branch = branch_for_target_reachable (code + MONO_PPC_32_64_CASE (8, 5*4), tramp);
461 #ifdef __mono_ppc64__
462 /* FIXME: make shorter if possible */
465 mono_domain_code_commit (domain, code, TRAMPOLINE_SIZE, 12);
467 mono_domain_unlock (domain);
470 ppc_load_sequence (code, ppc_r0, (mgreg_t)(gsize) arg1);
471 ppc_emit32 (code, short_branch);
473 /* Prepare the jump to the generic trampoline code.*/
474 ppc_load_ptr (code, ppc_r0, tramp);
475 ppc_mtctr (code, ppc_r0);
477 /* And finally put 'arg1' in r0 and fly! */
478 ppc_load_ptr (code, ppc_r0, arg1);
479 ppc_bcctr (code, 20, 0);
482 /* Flush instruction cache, since we've generated code */
483 mono_arch_flush_icache (buf, code - buf);
485 g_assert ((code - buf) <= TRAMPOLINE_SIZE);
488 *code_len = code - buf;
494 emit_trampoline_jump (guint8 *code, guint8 *tramp)
496 guint32 short_branch = branch_for_target_reachable (code, tramp);
498 /* FIXME: we can save a few bytes here by committing if the
499 short branch is possible */
501 ppc_emit32 (code, short_branch);
503 ppc_load_ptr (code, ppc_r0, tramp);
504 ppc_mtctr (code, ppc_r0);
505 ppc_bcctr (code, 20, 0);
512 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
514 #ifdef MONO_ARCH_VTABLE_REG
517 guint8 **rgctx_null_jumps;
522 MonoJumpInfo *ji = NULL;
523 GSList *unwind_ops = NULL;
525 mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
526 index = MONO_RGCTX_SLOT_INDEX (slot);
528 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
529 for (depth = 0; ; ++depth) {
530 int size = mono_class_rgctx_get_array_size (depth, mrgctx);
532 if (index < size - 1)
537 tramp_size = MONO_PPC_32_64_CASE (40, 52) + 12 * depth;
545 code = buf = mono_global_codeman_reserve (tramp_size);
547 rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
551 ppc_mr (code, ppc_r4, PPC_FIRST_ARG_REG);
553 /* load rgctx ptr from vtable */
554 ppc_ldptr (code, ppc_r4, G_STRUCT_OFFSET (MonoVTable, runtime_generic_context), PPC_FIRST_ARG_REG);
555 /* is the rgctx ptr null? */
556 ppc_compare_reg_imm (code, 0, ppc_r4, 0);
557 /* if yes, jump to actual trampoline */
558 rgctx_null_jumps [0] = code;
559 ppc_bc (code, PPC_BR_TRUE, PPC_BR_EQ, 0);
562 for (i = 0; i < depth; ++i) {
563 /* load ptr to next array */
564 if (mrgctx && i == 0)
565 ppc_ldptr (code, ppc_r4, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT, ppc_r4);
567 ppc_ldptr (code, ppc_r4, 0, ppc_r4);
568 /* is the ptr null? */
569 ppc_compare_reg_imm (code, 0, ppc_r4, 0);
570 /* if yes, jump to actual trampoline */
571 rgctx_null_jumps [i + 1] = code;
572 ppc_bc (code, PPC_BR_TRUE, PPC_BR_EQ, 0);
576 ppc_ldptr (code, ppc_r4, sizeof (gpointer) * (index + 1), ppc_r4);
577 /* is the slot null? */
578 ppc_compare_reg_imm (code, 0, ppc_r4, 0);
579 /* if yes, jump to actual trampoline */
580 rgctx_null_jumps [depth + 1] = code;
581 ppc_bc (code, PPC_BR_TRUE, PPC_BR_EQ, 0);
582 /* otherwise return r4 */
583 /* FIXME: if we use r3 as the work register we can avoid this copy */
584 ppc_mr (code, ppc_r3, ppc_r4);
587 for (i = mrgctx ? 1 : 0; i <= depth + 1; ++i)
588 ppc_patch (rgctx_null_jumps [i], code);
590 g_free (rgctx_null_jumps);
592 /* move the rgctx pointer to the VTABLE register */
593 ppc_mr (code, MONO_ARCH_VTABLE_REG, ppc_r3);
596 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
597 /* Branch to the trampoline */
598 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
599 ppc_ldptr (code, ppc_r11, 0, ppc_r11);
601 ppc_mtctr (code, ppc_r11);
602 ppc_bcctr (code, PPC_BR_ALWAYS, 0);
604 tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot),
605 MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), NULL);
607 /* jump to the actual trampoline */
608 code = emit_trampoline_jump (code, tramp);
611 mono_arch_flush_icache (buf, code - buf);
613 g_assert (code - buf <= tramp_size);
616 char *name = mono_get_rgctx_fetch_trampoline_name (slot);
617 *info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);
623 g_assert_not_reached ();
628 mono_arch_create_generic_class_init_trampoline (MonoTrampInfo **info, gboolean aot)
632 static int byte_offset = -1;
633 static guint8 bitmask;
636 GSList *unwind_ops = NULL;
637 MonoJumpInfo *ji = NULL;
639 tramp_size = MONO_PPC_32_64_CASE (32, 44);
643 code = buf = mono_global_codeman_reserve (tramp_size);
646 mono_marshal_find_bitfield_offset (MonoVTable, initialized, &byte_offset, &bitmask);
648 ppc_lbz (code, ppc_r4, byte_offset, MONO_ARCH_VTABLE_REG);
649 ppc_andid (code, ppc_r4, ppc_r4, bitmask);
651 ppc_bc (code, PPC_BR_TRUE, PPC_BR_EQ, 0);
655 ppc_patch (jump, code);
658 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "specific_trampoline_generic_class_init");
659 /* Branch to the trampoline */
660 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
661 ppc_ldptr (code, ppc_r11, 0, ppc_r11);
663 ppc_mtctr (code, ppc_r11);
664 ppc_bcctr (code, PPC_BR_ALWAYS, 0);
666 tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_GENERIC_CLASS_INIT,
667 mono_get_root_domain (), NULL);
669 /* jump to the actual trampoline */
670 code = emit_trampoline_jump (code, tramp);
673 mono_arch_flush_icache (buf, code - buf);
675 g_assert (code - buf <= tramp_size);
678 *info = mono_tramp_info_create ("generic_class_init_trampoline", buf, code - buf, ji, unwind_ops);
684 mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
687 guint32 tramp_size = 64;
689 code = buf = mono_global_codeman_reserve (tramp_size);
692 mono_arch_flush_icache (buf, code - buf);
694 g_assert (code - buf <= tramp_size);
697 *info = mono_tramp_info_create ("nullified_class_init_trampoline", buf, code - buf, NULL, NULL);
703 mono_arch_get_call_target (guint8 *code)
706 guint32 ins = ((guint32*)(gpointer)code) [-1];
708 if ((ins >> 26 == 18) && ((ins & 1) == 1) && ((ins & 2) == 0)) {
709 gint32 disp = (((gint32)ins) >> 2) & 0xffffff;
710 guint8 *target = code - 4 + (disp * 4);
719 mono_arch_get_plt_info_offset (guint8 *plt_entry, mgreg_t *regs, guint8 *code)
721 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
722 return ((guint32*)plt_entry) [8];
724 return ((guint32*)plt_entry) [6];