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/abi-details.h>
18 #include <mono/metadata/appdomain.h>
19 #include <mono/metadata/marshal.h>
20 #include <mono/metadata/tabledefs.h>
21 #include <mono/arch/ppc/ppc-codegen.h>
27 /* Same as mono_create_ftnptr, but doesn't require a domain */
29 mono_ppc_create_ftnptr (guint8 *code)
31 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
32 MonoPPCFunctionDescriptor *ftnptr = mono_global_codeman_reserve (sizeof (MonoPPCFunctionDescriptor));
46 * Return the instruction to jump from code to target, 0 if not
47 * reachable with a single instruction
50 branch_for_target_reachable (guint8 *branch, guint8 *target)
52 gint diff = target - branch;
53 g_assert ((diff & 3) == 0);
56 return (18 << 26) | (diff);
58 /* diff between 0 and -33554432 */
59 if (diff >= -33554432)
60 return (18 << 26) | (diff & ~0xfc000000);
66 * get_unbox_trampoline:
68 * @addr: pointer to native code for @m
70 * when value type methods are called through the vtable we need to unbox the
71 * this argument. This method returns a pointer to a trampoline which does
72 * unboxing before calling the method
75 mono_arch_get_unbox_trampoline (MonoMethod *m, gpointer addr)
80 MonoDomain *domain = mono_domain_get ();
81 int size = MONO_PPC_32_64_CASE (20, 32) + PPC_FTNPTR_SIZE;
83 addr = mono_get_addr_from_ftnptr (addr);
85 mono_domain_lock (domain);
86 start = code = mono_domain_code_reserve (domain, size);
87 code = mono_ppc_create_pre_code_ftnptr (code);
88 short_branch = branch_for_target_reachable (code + 4, addr);
90 mono_domain_code_commit (domain, code, size, 8);
91 mono_domain_unlock (domain);
94 ppc_addi (code, this_pos, this_pos, sizeof (MonoObject));
95 ppc_emit32 (code, short_branch);
97 ppc_load_ptr (code, ppc_r0, addr);
98 ppc_mtctr (code, ppc_r0);
99 ppc_addi (code, this_pos, this_pos, sizeof (MonoObject));
100 ppc_bcctr (code, 20, 0);
102 mono_arch_flush_icache (start, code - start);
103 g_assert ((code - start) <= size);
104 /*g_print ("unbox trampoline at %d for %s:%s\n", this_pos, m->klass->name, m->name);
105 g_print ("unbox code is at %p for method at %p\n", start, addr);*/
111 * mono_arch_get_static_rgctx_trampoline:
113 * Create a trampoline which sets RGCTX_REG to MRGCTX, then jumps to ADDR.
116 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, MonoMethodRuntimeGenericContext *mrgctx, gpointer addr)
118 guint8 *code, *start, *p;
119 guint8 imm_buf [128];
120 guint32 short_branch;
121 MonoDomain *domain = mono_domain_get ();
123 int size = MONO_PPC_32_64_CASE (24, (PPC_LOAD_SEQUENCE_LENGTH * 2) + 8) + PPC_FTNPTR_SIZE;
125 addr = mono_get_addr_from_ftnptr (addr);
127 /* Compute size of code needed to emit mrgctx */
129 ppc_load_ptr (p, MONO_ARCH_RGCTX_REG, mrgctx);
130 imm_size = p - imm_buf;
132 mono_domain_lock (domain);
133 start = code = mono_domain_code_reserve (domain, size);
134 code = mono_ppc_create_pre_code_ftnptr (code);
135 short_branch = branch_for_target_reachable (code + imm_size, addr);
137 mono_domain_code_commit (domain, code, size, imm_size + 4);
138 mono_domain_unlock (domain);
141 ppc_load_ptr (code, MONO_ARCH_RGCTX_REG, mrgctx);
142 ppc_emit32 (code, short_branch);
144 ppc_load_ptr (code, ppc_r0, addr);
145 ppc_mtctr (code, ppc_r0);
146 ppc_load_ptr (code, MONO_ARCH_RGCTX_REG, mrgctx);
147 ppc_bcctr (code, 20, 0);
149 mono_arch_flush_icache (start, code - start);
150 g_assert ((code - start) <= size);
156 mono_arch_patch_callsite (guint8 *method_start, guint8 *code_ptr, guint8 *addr)
158 guint32 *code = (guint32*)code_ptr;
160 addr = mono_get_addr_from_ftnptr (addr);
162 /* This is the 'blrl' instruction */
166 * Note that methods are called also with the bl opcode.
168 if (((*code) >> 26) == 18) {
169 /*g_print ("direct patching\n");*/
170 ppc_patch ((guint8*)code, addr);
171 mono_arch_flush_icache ((guint8*)code, 4);
176 g_assert (mono_ppc_is_direct_call_sequence (code));
178 ppc_patch ((guint8*)code, addr);
182 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
184 guint32 ins1, ins2, offset;
186 /* Patch the jump table entry used by the plt entry */
188 /* Should be a lis+ori */
189 ins1 = ((guint32*)code)[0];
190 g_assert (ins1 >> 26 == 15);
191 ins2 = ((guint32*)code)[1];
192 g_assert (ins2 >> 26 == 24);
193 offset = ((ins1 & 0xffff) << 16) | (ins2 & 0xffff);
195 /* Either got or regs is set */
197 got = (gpointer*)(gsize) regs [30];
198 *(guint8**)((guint8*)got + offset) = addr;
202 mono_arch_nullify_class_init_trampoline (guint8 *code, mgreg_t *regs)
204 mono_arch_patch_callsite (NULL, code, mini_get_nullified_class_init_trampoline ());
207 /* Stack size for trampoline function
208 * PPC_MINIMAL_STACK_SIZE + 16 (args + alignment to ppc_magic_trampoline)
209 * + MonoLMF + 14 fp regs + 13 gregs + alignment
211 #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))
213 /* Method-specific trampoline code fragment size */
214 #define METHOD_TRAMPOLINE_SIZE 64
216 /* Jump-specific trampoline code fragment size */
217 #define JUMP_TRAMPOLINE_SIZE 64
219 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
220 #define PPC_TOC_REG ppc_r2
222 #define PPC_TOC_REG -1
226 * Stack frame description when the generic trampoline is called.
228 * --------------------
230 * -------------------
231 * Saved FP registers 0-13
232 * -------------------
233 * Saved general registers 0-30
234 * -------------------
235 * param area for 3 args to ppc_magic_trampoline
236 * -------------------
238 * -------------------
241 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
244 guint8 *buf, *code = NULL;
246 gconstpointer tramp_handler;
247 int size = MONO_PPC_32_64_CASE (600, 800);
248 GSList *unwind_ops = NULL;
249 MonoJumpInfo *ji = NULL;
251 /* Now we'll create in 'buf' the PowerPC trampoline code. This
252 is the trampoline code common to all methods */
254 code = buf = mono_global_codeman_reserve (size);
256 ppc_str_update (code, ppc_r1, -STACK, ppc_r1);
258 /* start building the MonoLMF on the stack */
259 offset = STACK - sizeof (double) * MONO_SAVED_FREGS;
260 for (i = 14; i < 32; i++) {
261 ppc_stfd (code, i, offset, ppc_r1);
262 offset += sizeof (double);
265 * now the integer registers.
267 offset = STACK - sizeof (MonoLMF) + G_STRUCT_OFFSET (MonoLMF, iregs);
268 ppc_str_multiple (code, ppc_r13, offset, ppc_r1);
270 /* Now save the rest of the registers below the MonoLMF struct, first 14
271 * fp regs and then the 31 gregs.
273 offset = STACK - sizeof (MonoLMF) - (14 * sizeof (double));
274 for (i = 0; i < 14; i++) {
275 ppc_stfd (code, i, offset, ppc_r1);
276 offset += sizeof (double);
278 #define GREGS_OFFSET (STACK - sizeof (MonoLMF) - (14 * sizeof (double)) - (31 * sizeof (mgreg_t)))
279 offset = GREGS_OFFSET;
280 for (i = 0; i < 31; i++) {
281 ppc_str (code, i, offset, ppc_r1);
282 offset += sizeof (mgreg_t);
285 /* we got here through a jump to the ctr reg, we must save the lr
286 * in the parent frame (we do it here to reduce the size of the
287 * method-specific trampoline)
289 ppc_mflr (code, ppc_r0);
290 ppc_str (code, ppc_r0, STACK + PPC_RET_ADDR_OFFSET, ppc_r1);
292 /* ok, now we can continue with the MonoLMF setup, mostly untouched
293 * from emit_prolog in mini-ppc.c
296 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_get_lmf_addr");
297 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
298 ppc_ldptr (code, ppc_r2, sizeof (gpointer), ppc_r11);
299 ppc_ldptr (code, ppc_r11, 0, ppc_r11);
301 ppc_mtlr (code, ppc_r11);
304 ppc_load_func (code, ppc_r0, mono_get_lmf_addr);
305 ppc_mtlr (code, ppc_r0);
308 /* we build the MonoLMF structure on the stack - see mini-ppc.h
309 * The pointer to the struct is put in ppc_r11.
311 ppc_addi (code, ppc_r11, ppc_sp, STACK - sizeof (MonoLMF));
312 ppc_stptr (code, ppc_r3, G_STRUCT_OFFSET(MonoLMF, lmf_addr), ppc_r11);
313 /* new_lmf->previous_lmf = *lmf_addr */
314 ppc_ldptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r3);
315 ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r11);
316 /* *(lmf_addr) = r11 */
317 ppc_stptr (code, ppc_r11, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r3);
318 /* save method info (it's stored on the stack, so get it first). */
319 if ((tramp_type == MONO_TRAMPOLINE_JIT) || (tramp_type == MONO_TRAMPOLINE_JUMP)) {
320 ppc_ldr (code, ppc_r0, GREGS_OFFSET, ppc_r1);
321 ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, method), ppc_r11);
323 ppc_load (code, ppc_r0, 0);
324 ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, method), ppc_r11);
326 /* store the frame pointer of the calling method */
327 ppc_addi (code, ppc_r0, ppc_sp, STACK);
328 ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, ebp), ppc_r11);
329 /* save the IP (caller ip) */
330 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
331 ppc_li (code, ppc_r0, 0);
333 ppc_ldr (code, ppc_r0, STACK + PPC_RET_ADDR_OFFSET, ppc_r1);
335 ppc_stptr (code, ppc_r0, G_STRUCT_OFFSET(MonoLMF, eip), ppc_r11);
338 * Now we're ready to call trampoline (mgreg_t *regs, guint8 *code, gpointer value, guint8 *tramp)
339 * Note that the last argument is unused.
341 /* Arg 1: a pointer to the registers */
342 ppc_addi (code, ppc_r3, ppc_r1, GREGS_OFFSET);
344 /* Arg 2: code (next address to the instruction that called us) */
345 if (tramp_type == MONO_TRAMPOLINE_JUMP)
346 ppc_li (code, ppc_r4, 0);
348 ppc_ldr (code, ppc_r4, STACK + PPC_RET_ADDR_OFFSET, ppc_r1);
350 /* Arg 3: trampoline argument */
351 if (tramp_type == MONO_TRAMPOLINE_GENERIC_CLASS_INIT)
352 ppc_ldr (code, ppc_r5, GREGS_OFFSET + MONO_ARCH_VTABLE_REG * sizeof (mgreg_t), ppc_r1);
354 ppc_ldr (code, ppc_r5, GREGS_OFFSET, ppc_r1);
357 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("trampoline_func_%d", tramp_type));
358 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
359 ppc_ldptr (code, ppc_r2, sizeof (gpointer), ppc_r11);
360 ppc_ldptr (code, ppc_r11, 0, ppc_r11);
362 ppc_mtlr (code, ppc_r11);
365 tramp_handler = mono_get_trampoline_func (tramp_type);
366 ppc_load_func (code, ppc_r0, tramp_handler);
367 ppc_mtlr (code, ppc_r0);
371 /* OK, code address is now on r3. Move it to the counter reg
372 * so it will be ready for the final jump: this is safe since we
373 * won't do any more calls.
375 if (!MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type)) {
376 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
377 ppc_ldptr (code, ppc_r2, sizeof (gpointer), ppc_r3);
378 ppc_ldptr (code, ppc_r3, 0, ppc_r3);
380 ppc_mtctr (code, ppc_r3);
384 * Now we restore the MonoLMF (see emit_epilogue in mini-ppc.c)
385 * and the rest of the registers, so the method called will see
386 * the same state as before we executed.
387 * The pointer to MonoLMF is in ppc_r11.
389 ppc_addi (code, ppc_r11, ppc_r1, STACK - sizeof (MonoLMF));
390 /* r5 = previous_lmf */
391 ppc_ldptr (code, ppc_r5, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r11);
393 ppc_ldptr (code, ppc_r6, G_STRUCT_OFFSET(MonoLMF, lmf_addr), ppc_r11);
394 /* *(lmf_addr) = previous_lmf */
395 ppc_stptr (code, ppc_r5, G_STRUCT_OFFSET(MonoLMF, previous_lmf), ppc_r6);
397 ppc_ldr_multiple (code, ppc_r13, G_STRUCT_OFFSET(MonoLMF, iregs), ppc_r11);
399 for (i = 14; i < 32; i++)
400 ppc_lfd (code, i, G_STRUCT_OFFSET(MonoLMF, fregs) + ((i-14) * sizeof (gdouble)), ppc_r11);
402 /* restore the volatile registers, we skip r1, of course */
403 offset = STACK - sizeof (MonoLMF) - (14 * sizeof (double));
404 for (i = 0; i < 14; i++) {
405 ppc_lfd (code, i, offset, ppc_r1);
406 offset += sizeof (double);
408 offset = STACK - sizeof (MonoLMF) - (14 * sizeof (double)) - (31 * sizeof (mgreg_t));
409 ppc_ldr (code, ppc_r0, offset, ppc_r1);
410 offset += 2 * sizeof (mgreg_t);
411 for (i = 2; i < 13; i++) {
412 if (i != PPC_TOC_REG && (i != 3 || tramp_type != MONO_TRAMPOLINE_RGCTX_LAZY_FETCH))
413 ppc_ldr (code, i, offset, ppc_r1);
414 offset += sizeof (mgreg_t);
417 /* Non-standard function epilogue. Instead of doing a proper
418 * return, we just jump to the compiled code.
420 /* Restore stack pointer and LR and jump to the code */
421 ppc_ldr (code, ppc_r1, 0, ppc_r1);
422 ppc_ldr (code, ppc_r11, PPC_RET_ADDR_OFFSET, ppc_r1);
423 ppc_mtlr (code, ppc_r11);
424 if (MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type))
427 ppc_bcctr (code, 20, 0);
429 /* Flush instruction cache, since we've generated code */
430 mono_arch_flush_icache (buf, code - buf);
433 g_assert ((code - buf) <= size);
436 tramp_name = mono_get_generic_trampoline_name (tramp_type);
437 *info = mono_tramp_info_create (tramp_name, buf, code - buf, ji, unwind_ops);
444 #define TRAMPOLINE_SIZE (MONO_PPC_32_64_CASE (24, (5+5+1+1)*4))
446 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
448 guint8 *code, *buf, *tramp;
449 guint32 short_branch;
451 tramp = mono_get_trampoline_code (tramp_type);
453 mono_domain_lock (domain);
454 code = buf = mono_domain_code_reserve_align (domain, TRAMPOLINE_SIZE, 4);
455 short_branch = branch_for_target_reachable (code + MONO_PPC_32_64_CASE (8, 5*4), tramp);
456 #ifdef __mono_ppc64__
457 /* FIXME: make shorter if possible */
460 mono_domain_code_commit (domain, code, TRAMPOLINE_SIZE, 12);
462 mono_domain_unlock (domain);
465 ppc_load_sequence (code, ppc_r0, (mgreg_t)(gsize) arg1);
466 ppc_emit32 (code, short_branch);
468 /* Prepare the jump to the generic trampoline code.*/
469 ppc_load_ptr (code, ppc_r0, tramp);
470 ppc_mtctr (code, ppc_r0);
472 /* And finally put 'arg1' in r0 and fly! */
473 ppc_load_ptr (code, ppc_r0, arg1);
474 ppc_bcctr (code, 20, 0);
477 /* Flush instruction cache, since we've generated code */
478 mono_arch_flush_icache (buf, code - buf);
480 g_assert ((code - buf) <= TRAMPOLINE_SIZE);
483 *code_len = code - buf;
489 emit_trampoline_jump (guint8 *code, guint8 *tramp)
491 guint32 short_branch = branch_for_target_reachable (code, tramp);
493 /* FIXME: we can save a few bytes here by committing if the
494 short branch is possible */
496 ppc_emit32 (code, short_branch);
498 ppc_load_ptr (code, ppc_r0, tramp);
499 ppc_mtctr (code, ppc_r0);
500 ppc_bcctr (code, 20, 0);
507 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
509 #ifdef MONO_ARCH_VTABLE_REG
512 guint8 **rgctx_null_jumps;
517 MonoJumpInfo *ji = NULL;
518 GSList *unwind_ops = NULL;
520 mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
521 index = MONO_RGCTX_SLOT_INDEX (slot);
523 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
524 for (depth = 0; ; ++depth) {
525 int size = mono_class_rgctx_get_array_size (depth, mrgctx);
527 if (index < size - 1)
532 tramp_size = MONO_PPC_32_64_CASE (40, 52) + 12 * depth;
540 code = buf = mono_global_codeman_reserve (tramp_size);
542 rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
546 ppc_mr (code, ppc_r4, PPC_FIRST_ARG_REG);
548 /* load rgctx ptr from vtable */
549 ppc_ldptr (code, ppc_r4, MONO_STRUCT_OFFSET (MonoVTable, runtime_generic_context), PPC_FIRST_ARG_REG);
550 /* is the rgctx ptr null? */
551 ppc_compare_reg_imm (code, 0, ppc_r4, 0);
552 /* if yes, jump to actual trampoline */
553 rgctx_null_jumps [0] = code;
554 ppc_bc (code, PPC_BR_TRUE, PPC_BR_EQ, 0);
557 for (i = 0; i < depth; ++i) {
558 /* load ptr to next array */
559 if (mrgctx && i == 0)
560 ppc_ldptr (code, ppc_r4, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT, ppc_r4);
562 ppc_ldptr (code, ppc_r4, 0, ppc_r4);
563 /* is the ptr null? */
564 ppc_compare_reg_imm (code, 0, ppc_r4, 0);
565 /* if yes, jump to actual trampoline */
566 rgctx_null_jumps [i + 1] = code;
567 ppc_bc (code, PPC_BR_TRUE, PPC_BR_EQ, 0);
571 ppc_ldptr (code, ppc_r4, sizeof (gpointer) * (index + 1), ppc_r4);
572 /* is the slot null? */
573 ppc_compare_reg_imm (code, 0, ppc_r4, 0);
574 /* if yes, jump to actual trampoline */
575 rgctx_null_jumps [depth + 1] = code;
576 ppc_bc (code, PPC_BR_TRUE, PPC_BR_EQ, 0);
577 /* otherwise return r4 */
578 /* FIXME: if we use r3 as the work register we can avoid this copy */
579 ppc_mr (code, ppc_r3, ppc_r4);
582 for (i = mrgctx ? 1 : 0; i <= depth + 1; ++i)
583 ppc_patch (rgctx_null_jumps [i], code);
585 g_free (rgctx_null_jumps);
587 /* move the rgctx pointer to the VTABLE register */
588 ppc_mr (code, MONO_ARCH_VTABLE_REG, ppc_r3);
591 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot));
592 /* Branch to the trampoline */
593 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
594 ppc_ldptr (code, ppc_r11, 0, ppc_r11);
596 ppc_mtctr (code, ppc_r11);
597 ppc_bcctr (code, PPC_BR_ALWAYS, 0);
599 tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot),
600 MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), NULL);
602 /* jump to the actual trampoline */
603 code = emit_trampoline_jump (code, tramp);
606 mono_arch_flush_icache (buf, code - buf);
608 g_assert (code - buf <= tramp_size);
611 char *name = mono_get_rgctx_fetch_trampoline_name (slot);
612 *info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);
618 g_assert_not_reached ();
623 mono_arch_create_generic_class_init_trampoline (MonoTrampInfo **info, gboolean aot)
627 static int byte_offset = -1;
628 static guint8 bitmask;
631 GSList *unwind_ops = NULL;
632 MonoJumpInfo *ji = NULL;
634 tramp_size = MONO_PPC_32_64_CASE (32, 44);
638 code = buf = mono_global_codeman_reserve (tramp_size);
641 mono_marshal_find_bitfield_offset (MonoVTable, initialized, &byte_offset, &bitmask);
643 ppc_lbz (code, ppc_r4, byte_offset, MONO_ARCH_VTABLE_REG);
644 ppc_andid (code, ppc_r4, ppc_r4, bitmask);
646 ppc_bc (code, PPC_BR_TRUE, PPC_BR_EQ, 0);
650 ppc_patch (jump, code);
653 code = mono_arch_emit_load_aotconst (buf, code, &ji, MONO_PATCH_INFO_JIT_ICALL_ADDR, "specific_trampoline_generic_class_init");
654 /* Branch to the trampoline */
655 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
656 ppc_ldptr (code, ppc_r11, 0, ppc_r11);
658 ppc_mtctr (code, ppc_r11);
659 ppc_bcctr (code, PPC_BR_ALWAYS, 0);
661 tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_GENERIC_CLASS_INIT,
662 mono_get_root_domain (), NULL);
664 /* jump to the actual trampoline */
665 code = emit_trampoline_jump (code, tramp);
668 mono_arch_flush_icache (buf, code - buf);
670 g_assert (code - buf <= tramp_size);
673 *info = mono_tramp_info_create ("generic_class_init_trampoline", buf, code - buf, ji, unwind_ops);
679 mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
682 guint32 tramp_size = 64;
684 code = buf = mono_global_codeman_reserve (tramp_size);
687 mono_arch_flush_icache (buf, code - buf);
689 g_assert (code - buf <= tramp_size);
692 *info = mono_tramp_info_create ("nullified_class_init_trampoline", buf, code - buf, NULL, NULL);
698 mono_arch_get_call_target (guint8 *code)
701 guint32 ins = ((guint32*)(gpointer)code) [-1];
703 if ((ins >> 26 == 18) && ((ins & 1) == 1) && ((ins & 2) == 0)) {
704 gint32 disp = (((gint32)ins) >> 2) & 0xffffff;
705 guint8 *target = code - 4 + (disp * 4);
714 mono_arch_get_plt_info_offset (guint8 *plt_entry, mgreg_t *regs, guint8 *code)
716 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
717 return ((guint32*)plt_entry) [8];
719 return ((guint32*)plt_entry) [6];