2 * tramp-mips.c: JIT trampoline code for MIPS
5 * Mark Mason (mason@broadcom.com)
7 * Based on tramp-ppc.c by:
8 * Dietmar Maurer (dietmar@ximian.com)
9 * Paolo Molaro (lupus@ximian.com)
10 * Carlos Valiente <yo@virutass.net>
13 * (C) 2001 Ximian, Inc.
19 #include <mono/metadata/appdomain.h>
20 #include <mono/metadata/marshal.h>
21 #include <mono/metadata/tabledefs.h>
22 #include <mono/arch/mips/mips-codegen.h>
25 #include "mini-mips.h"
27 static guint8
* nullified_class_init_trampoline
;
30 * get_unbox_trampoline:
32 * @addr: pointer to native code for @m
34 * when value type methods are called through the vtable we need to unbox the
35 * this argument. This method returns a pointer to a trampoline which does
36 * unboxing before calling the method
39 mono_arch_get_unbox_trampoline (MonoMethod
*m
, gpointer addr
)
42 MonoDomain
*domain
= mono_domain_get ();
44 start
= code
= mono_domain_code_reserve (domain
, 20);
46 mips_load (code
, mips_t9
, addr
);
47 /* The this pointer is kept in a0 */
48 mips_addiu (code
, mips_a0
, mips_a0
, sizeof (MonoObject
));
49 mips_jr (code
, mips_t9
);
52 mono_arch_flush_icache (start
, code
- start
);
53 g_assert ((code
- start
) <= 20);
54 /*g_print ("unbox trampoline at %d for %s:%s\n", this_pos, m->klass->name, m->name);
55 g_print ("unbox code is at %p for method at %p\n", start, addr);*/
61 mono_arch_patch_callsite (guint8
*method_start
, guint8
*orig_code
, guint8
*addr
)
63 guint32
*code
= (guint32
*)orig_code
;
65 /* Locate the address of the method-specific trampoline.
66 The call using the vtable slot that took the processing flow to
67 'arch_create_jit_trampoline' looks something like one of these:
77 On entry, 'code' points just after one of the above sequences.
81 if ((code
[-2] >> 26) == 0x03) {
82 //g_print ("direct patching\n");
83 mips_patch ((code
-2), (gsize
)addr
);
86 /* Look for the jalr */
87 if ((code
[-2] & 0xfc1f003f) == 0x00000009) {
88 /* The lui / addiu / jalr case */
89 if ((code
[-4] >> 26) == 0x0f && (code
[-3] >> 26) == 0x09
90 && (code
[-2] >> 26) == 0) {
91 mips_patch ((code
-4), (gsize
)addr
);
95 g_print("error: bad patch at 0x%08x\n", code
);
96 g_assert_not_reached ();
100 mono_arch_patch_plt_entry (guint8
*code
, gpointer
*got
, mgreg_t
*regs
, guint8
*addr
)
102 g_assert_not_reached ();
105 /* Stack size for trampoline function
106 * MIPS_MINIMAL_STACK_SIZE + 16 (args + alignment to mips_magic_trampoline)
107 * + MonoLMF + 14 fp regs + 13 gregs + alignment
108 * #define STACK (MIPS_MINIMAL_STACK_SIZE + 4 * sizeof (gulong) + sizeof (MonoLMF) + 14 * sizeof (double) + 13 * (sizeof (gulong)))
109 * STACK would be 444 for 32 bit darwin
112 #define STACK (4*IREG_SIZE + 8 + sizeof(MonoLMF) + 32)
115 mono_arch_nullify_plt_entry (guint8
*code
, mgreg_t
*regs
)
117 if (mono_aot_only
&& !nullified_class_init_trampoline
)
118 nullified_class_init_trampoline
= mono_aot_get_trampoline ("nullified_class_init_trampoline");
120 mono_arch_patch_plt_entry (code
, NULL
, regs
, nullified_class_init_trampoline
);
124 mono_arch_nullify_class_init_trampoline (guint8
*code
, mgreg_t
*regs
)
126 guint32
*code32
= (guint32
*)code
;
128 /* back up to the jal/jalr instruction */
131 /* Check for jal/jalr -- and NOP it out */
132 if ((((*code32
)&0xfc000000) == 0x0c000000)
133 || (((*code32
)&0xfc1f003f) == 0x00000009)) {
135 mono_arch_flush_icache ((gpointer
)(code32
- 1), 4);
138 g_assert_not_reached ();
142 mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo
**info
)
146 code
= buf
= mono_global_codeman_reserve (16);
148 mips_jr (code
, mips_ra
);
151 mono_arch_flush_icache (buf
, code
- buf
);
154 *info
= mono_tramp_info_create (g_strdup_printf ("nullified_class_init_trampoline"), buf
, code
- buf
, NULL
, NULL
);
160 * Stack frame description when the generic trampoline is called.
162 * --------------------
164 * -------------------
165 * Saved FP registers 0-13
166 * -------------------
167 * Saved general registers 0-12
168 * -------------------
169 * param area for 3 args to mips_magic_trampoline
170 * -------------------
172 * -------------------
175 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type
, MonoTrampInfo
**info
, gboolean aot
)
177 guint8
*buf
, *tramp
, *code
= NULL
;
179 GSList
*unwind_ops
= NULL
;
180 MonoJumpInfo
*ji
= NULL
;
181 int max_code_len
= 768;
183 /* AOT not supported on MIPS yet */
186 /* Now we'll create in 'buf' the MIPS trampoline code. This
187 is the trampoline code common to all methods */
189 code
= buf
= mono_global_codeman_reserve (max_code_len
);
191 /* Allocate the stack frame, and save the return address */
192 mips_addiu (code
, mips_sp
, mips_sp
, -STACK
);
193 mips_sw (code
, mips_ra
, mips_sp
, STACK
+ MIPS_RET_ADDR_OFFSET
);
195 /* we build the MonoLMF structure on the stack - see mini-mips.h */
196 /* offset of MonoLMF from sp */
197 lmf
= STACK
- sizeof (MonoLMF
) - 8;
199 for (i
= 0; i
< MONO_MAX_IREGS
; i
++)
200 MIPS_SW (code
, i
, mips_sp
, lmf
+ G_STRUCT_OFFSET (MonoLMF
, iregs
[i
]));
201 for (i
= 0; i
< MONO_MAX_FREGS
; i
++)
202 MIPS_SWC1 (code
, i
, mips_sp
, lmf
+ G_STRUCT_OFFSET (MonoLMF
, fregs
[i
]));
204 /* Set the magic number */
205 mips_load_const (code
, mips_at
, MIPS_LMF_MAGIC2
);
206 mips_sw (code
, mips_at
, mips_sp
, lmf
+ G_STRUCT_OFFSET(MonoLMF
, magic
));
209 mips_addiu (code
, mips_at
, mips_sp
, STACK
);
210 MIPS_SW (code
, mips_at
, mips_sp
, lmf
+ G_STRUCT_OFFSET (MonoLMF
, iregs
[mips_sp
]));
212 /* save method info (it was in t8) */
213 mips_sw (code
, mips_t8
, mips_sp
, lmf
+ G_STRUCT_OFFSET(MonoLMF
, method
));
215 /* save the IP (caller ip) */
216 if (tramp_type
== MONO_TRAMPOLINE_JUMP
) {
217 mips_sw (code
, mips_zero
, mips_sp
, lmf
+ G_STRUCT_OFFSET(MonoLMF
, eip
));
219 mips_sw (code
, mips_ra
, mips_sp
, lmf
+ G_STRUCT_OFFSET(MonoLMF
, eip
));
222 /* jump to mono_get_lmf_addr here */
223 mips_load (code
, mips_t9
, mono_get_lmf_addr
);
224 mips_jalr (code
, mips_t9
, mips_ra
);
227 /* v0 now points at the (MonoLMF **) for the current thread */
229 /* new_lmf->lmf_addr = lmf_addr -- useful when unwinding */
230 mips_sw (code
, mips_v0
, mips_sp
, lmf
+ G_STRUCT_OFFSET(MonoLMF
, lmf_addr
));
232 /* new_lmf->previous_lmf = *lmf_addr */
233 mips_lw (code
, mips_at
, mips_v0
, 0);
234 mips_sw (code
, mips_at
, mips_sp
, lmf
+ G_STRUCT_OFFSET(MonoLMF
, previous_lmf
));
236 /* *(lmf_addr) = new_lmf */
237 mips_addiu (code
, mips_at
, mips_sp
, lmf
);
238 mips_sw (code
, mips_at
, mips_v0
, 0);
241 * Now we're ready to call mips_magic_trampoline ().
244 /* Arg 1: pointer to registers so that the magic trampoline can
245 * access what we saved above
247 mips_addiu (code
, mips_a0
, mips_sp
, lmf
+ G_STRUCT_OFFSET (MonoLMF
, iregs
[0]));
249 /* Arg 2: code (next address to the instruction that called us) */
250 if (tramp_type
== MONO_TRAMPOLINE_JUMP
) {
251 mips_move (code
, mips_a1
, mips_zero
);
253 mips_lw (code
, mips_a1
, mips_sp
, STACK
+ MIPS_RET_ADDR_OFFSET
);
256 /* Arg 3: MonoMethod *method. */
257 if (tramp_type
== MONO_TRAMPOLINE_GENERIC_CLASS_INIT
)
258 mips_lw (code
, mips_a2
, mips_sp
, lmf
+ G_STRUCT_OFFSET (MonoLMF
, iregs
[mips_a0
]));
260 mips_lw (code
, mips_a2
, mips_sp
, lmf
+ G_STRUCT_OFFSET (MonoLMF
, method
));
262 /* Arg 4: Trampoline */
263 mips_move (code
, mips_a3
, mips_zero
);
265 /* Now go to the trampoline */
266 tramp
= (guint8
*)mono_get_trampoline_func (tramp_type
);
267 mips_load (code
, mips_t9
, (guint32
)tramp
);
268 mips_jalr (code
, mips_t9
, mips_ra
);
271 /* Code address is now in v0, move it to at */
272 mips_move (code
, mips_at
, mips_v0
);
275 * Now unwind the MonoLMF
278 /* t0 = current_lmf->previous_lmf */
279 mips_lw (code
, mips_t0
, mips_sp
, lmf
+ G_STRUCT_OFFSET(MonoLMF
, previous_lmf
));
281 mips_lw (code
, mips_t1
, mips_sp
, lmf
+ G_STRUCT_OFFSET(MonoLMF
, lmf_addr
));
282 /* (*lmf_addr) = previous_lmf */
283 mips_sw (code
, mips_t0
, mips_t1
, 0);
285 /* Restore the callee-saved & argument registers */
286 for (i
= 0; i
< MONO_MAX_IREGS
; i
++) {
287 if ((MONO_ARCH_CALLEE_SAVED_REGS
| MONO_ARCH_CALLEE_REGS
| MIPS_ARG_REGS
) & (1 << i
))
288 MIPS_LW (code
, i
, mips_sp
, lmf
+ G_STRUCT_OFFSET (MonoLMF
, iregs
[i
]));
290 for (i
= 0; i
< MONO_MAX_FREGS
; i
++)
291 MIPS_LWC1 (code
, i
, mips_sp
, lmf
+ G_STRUCT_OFFSET (MonoLMF
, fregs
[i
]));
293 /* Non-standard function epilogue. Instead of doing a proper
294 * return, we just jump to the compiled code.
296 /* Restore ra & stack pointer, and jump to the code */
298 if (tramp_type
== MONO_TRAMPOLINE_RGCTX_LAZY_FETCH
)
299 mips_move (code
, mips_v0
, mips_at
);
300 mips_lw (code
, mips_ra
, mips_sp
, STACK
+ MIPS_RET_ADDR_OFFSET
);
301 mips_addiu (code
, mips_sp
, mips_sp
, STACK
);
302 if (MONO_TRAMPOLINE_TYPE_MUST_RETURN (tramp_type
))
303 mips_jr (code
, mips_ra
);
305 mips_jr (code
, mips_at
);
308 /* Flush instruction cache, since we've generated code */
309 mono_arch_flush_icache (buf
, code
- buf
);
312 g_assert ((code
- buf
) <= max_code_len
);
314 if (tramp_type
== MONO_TRAMPOLINE_CLASS_INIT
)
315 /* Initialize the nullified class init trampoline used in the AOT case */
316 nullified_class_init_trampoline
= mono_arch_get_nullified_class_init_trampoline (NULL
);
319 *info
= mono_tramp_info_create (mono_get_generic_trampoline_name (tramp_type
), buf
, code
- buf
, ji
, unwind_ops
);
325 mono_arch_create_specific_trampoline (gpointer arg1
, MonoTrampolineType tramp_type
, MonoDomain
*domain
, guint32
*code_len
)
327 guint8
*code
, *buf
, *tramp
;
329 tramp
= mono_get_trampoline_code (tramp_type
);
331 code
= buf
= mono_domain_code_reserve (domain
, 32);
333 /* Prepare the jump to the generic trampoline code
334 * mono_arch_create_trampoline_code() knows we're putting this in t8
336 mips_load (code
, mips_t8
, arg1
);
338 /* Now jump to the generic trampoline code */
339 mips_load (code
, mips_at
, tramp
);
340 mips_jr (code
, mips_at
);
343 /* Flush instruction cache, since we've generated code */
344 mono_arch_flush_icache (buf
, code
- buf
);
346 g_assert ((code
- buf
) <= 32);
349 *code_len
= code
- buf
;
355 mono_arch_get_static_rgctx_trampoline (MonoMethod
*m
, MonoMethodRuntimeGenericContext
*mrgctx
, gpointer addr
)
357 guint8
*code
, *start
;
360 MonoDomain
*domain
= mono_domain_get ();
364 start
= code
= mono_domain_code_reserve (domain
, buf_len
);
366 mips_load (code
, MONO_ARCH_RGCTX_REG
, mrgctx
);
367 mips_load (code
, mips_at
, addr
);
368 mips_jr (code
, mips_at
);
371 g_assert ((code
- start
) <= buf_len
);
373 mono_arch_flush_icache (start
, code
- start
);
379 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot
, MonoTrampInfo
**info
, gboolean aot
)
385 guint8
**rgctx_null_jumps
;
389 MonoJumpInfo
*ji
= NULL
;
390 GSList
*unwind_ops
= NULL
;
392 mrgctx
= MONO_RGCTX_SLOT_IS_MRGCTX (slot
);
393 index
= MONO_RGCTX_SLOT_INDEX (slot
);
395 index
+= MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT
/ sizeof (gpointer
);
396 for (depth
= 0; ; ++depth
) {
397 int size
= mono_class_rgctx_get_array_size (depth
, mrgctx
);
399 if (index
< size
- 1)
404 tramp_size
= 64 + 16 * depth
;
406 code
= buf
= mono_global_codeman_reserve (tramp_size
);
408 mono_add_unwind_op_def_cfa (unwind_ops
, code
, buf
, mips_sp
, 0);
410 rgctx_null_jumps
= g_malloc (sizeof (guint8
*) * (depth
+ 2));
413 /* The vtable/mrgctx is in a0 */
414 g_assert (MONO_ARCH_VTABLE_REG
== mips_a0
);
417 mips_move (code
, mips_a1
, mips_a0
);
419 /* load rgctx ptr from vtable */
420 g_assert (mips_is_imm16 (G_STRUCT_OFFSET (MonoVTable
, runtime_generic_context
)));
421 mips_lw (code
, mips_a1
, mips_a0
, G_STRUCT_OFFSET (MonoVTable
, runtime_generic_context
));
422 /* is the rgctx ptr null? */
423 /* if yes, jump to actual trampoline */
424 rgctx_null_jumps
[njumps
++] = code
;
425 mips_beq (code
, mips_a1
, mips_zero
, 0);
429 for (i
= 0; i
< depth
; ++i
) {
430 /* load ptr to next array */
431 if (mrgctx
&& i
== 0) {
432 g_assert (mips_is_imm16 (MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT
));
433 mips_lw (code
, mips_a1
, mips_a1
, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT
);
435 mips_lw (code
, mips_a1
, mips_a1
, 0);
437 /* is the ptr null? */
438 /* if yes, jump to actual trampoline */
439 rgctx_null_jumps
[njumps
++] = code
;
440 mips_beq (code
, mips_a1
, mips_zero
, 0);
445 g_assert (mips_is_imm16 (sizeof (gpointer
) * (index
+ 1)));
446 mips_lw (code
, mips_a1
, mips_a1
, sizeof (gpointer
) * (index
+ 1));
447 /* is the slot null? */
448 /* if yes, jump to actual trampoline */
449 rgctx_null_jumps
[njumps
++] = code
;
450 mips_beq (code
, mips_a1
, mips_zero
, 0);
452 /* otherwise return, result is in R1 */
453 mips_move (code
, mips_v0
, mips_a1
);
454 mips_jr (code
, mips_ra
);
457 g_assert (njumps
<= depth
+ 2);
458 for (i
= 0; i
< njumps
; ++i
)
459 mips_patch ((guint32
*)rgctx_null_jumps
[i
], (guint32
)code
);
461 g_free (rgctx_null_jumps
);
465 /* The vtable/mrgctx is still in a0 */
468 ji
= mono_patch_info_list_prepend (ji
, code
- buf
, MONO_PATCH_INFO_JIT_ICALL_ADDR
, g_strdup_printf ("specific_trampoline_lazy_fetch_%u", slot
));
469 mips_load (code
, mips_at
, 0);
470 mips_jr (code
, mips_at
);
473 tramp
= mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot
), MONO_TRAMPOLINE_RGCTX_LAZY_FETCH
, mono_get_root_domain (), &code_len
);
474 mips_load (code
, mips_at
, tramp
);
475 mips_jr (code
, mips_at
);
479 mono_arch_flush_icache (buf
, code
- buf
);
481 g_assert (code
- buf
<= tramp_size
);
484 *info
= mono_tramp_info_create (mono_get_rgctx_fetch_trampoline_name (slot
), buf
, code
- buf
, ji
, unwind_ops
);
490 mono_arch_create_generic_class_init_trampoline (MonoTrampInfo
**info
, gboolean aot
)
494 static int byte_offset
= -1;
495 static guint8 bitmask
;
499 GSList
*unwind_ops
= NULL
;
500 MonoJumpInfo
*ji
= NULL
;
504 code
= buf
= mono_global_codeman_reserve (tramp_size
);
507 mono_marshal_find_bitfield_offset (MonoVTable
, initialized
, &byte_offset
, &bitmask
);
509 /* if (!(vtable->initialized)) */
510 mips_lbu (code
, mips_at
, MONO_ARCH_VTABLE_REG
, byte_offset
);
511 g_assert (!(bitmask
& 0xffff0000));
512 mips_andi (code
, mips_at
, mips_at
, bitmask
);
514 mips_beq (code
, mips_at
, mips_zero
, 0);
516 /* Initialized case */
517 mips_jr (code
, mips_ra
);
520 /* Uninitialized case */
521 mips_patch ((guint32
*)jump
, (guint32
)code
);
524 ji
= mono_patch_info_list_prepend (ji
, code
- buf
, MONO_PATCH_INFO_JIT_ICALL_ADDR
, "specific_trampoline_generic_class_init");
525 mips_load (code
, mips_at
, 0);
526 mips_jr (code
, mips_at
);
529 tramp
= mono_arch_create_specific_trampoline (NULL
, MONO_TRAMPOLINE_GENERIC_CLASS_INIT
, mono_get_root_domain (), &code_len
);
530 mips_load (code
, mips_at
, tramp
);
531 mips_jr (code
, mips_at
);
535 mono_arch_flush_icache (buf
, code
- buf
);
537 g_assert (code
- buf
<= tramp_size
);
540 *info
= mono_tramp_info_create (g_strdup_printf ("generic_class_init_trampoline"), buf
, code
- buf
, ji
, unwind_ops
);