1 /*------------------------------------------------------------------*/
3 /* Name - tramp-s390.c */
5 /* Function - JIT trampoline code for S/390. */
7 /* Name - Neale Ferguson (Neale.Ferguson@SoftwareAG-usa.com) */
9 /* Date - January, 2004 */
11 /* Derivation - From exceptions-x86 & exceptions-ppc */
12 /* Paolo Molaro (lupus@ximian.com) */
13 /* Dietmar Maurer (dietmar@ximian.com) */
15 /* Copyright - 2001 Ximian, Inc. */
17 /*------------------------------------------------------------------*/
19 /*------------------------------------------------------------------*/
21 /*------------------------------------------------------------------*/
23 #define GR_SAVE_SIZE 4*sizeof(long)
24 #define FP_SAVE_SIZE 16*sizeof(double)
25 #define METHOD_SAVE_OFFSET S390_MINIMAL_STACK_SIZE
26 #define CREATE_GR_OFFSET METHOD_SAVE_OFFSET+sizeof(gpointer)
27 #define CREATE_FP_OFFSET CREATE_GR_OFFSET+GR_SAVE_SIZE
28 #define CREATE_LMF_OFFSET CREATE_FP_OFFSET+FP_SAVE_SIZE
29 #define CREATE_STACK_SIZE (CREATE_LMF_OFFSET+2*sizeof(long)+sizeof(MonoLMF))
31 /*------------------------------------------------------------------*/
32 /* Specific trampoline code fragment sizes */
33 /*------------------------------------------------------------------*/
34 #define SPECIFIC_TRAMPOLINE_SIZE 64
36 /*========================= End of Defines =========================*/
38 /*------------------------------------------------------------------*/
40 /*------------------------------------------------------------------*/
46 #include <mono/metadata/appdomain.h>
47 #include <mono/metadata/marshal.h>
48 #include <mono/metadata/tabledefs.h>
49 #include <mono/arch/s390/s390-codegen.h>
52 #include "mini-s390.h"
54 /*========================= End of Includes ========================*/
56 /*------------------------------------------------------------------*/
58 /*------------------------------------------------------------------*/
60 /*========================= End of Typedefs ========================*/
62 /*------------------------------------------------------------------*/
63 /* P r o t o t y p e s */
64 /*------------------------------------------------------------------*/
66 /*========================= End of Prototypes ======================*/
68 /*------------------------------------------------------------------*/
69 /* G l o b a l V a r i a b l e s */
70 /*------------------------------------------------------------------*/
73 /*====================== End of Global Variables ===================*/
75 /*------------------------------------------------------------------*/
77 /* Name - mono_arch_get_unbox_trampoline */
79 /* Function - Return a pointer to a trampoline which does the */
80 /* unboxing before calling the method. */
82 /* When value type methods are called through the */
83 /* vtable we need to unbox the 'this' argument. */
85 /* Parameters - method - Methd pointer */
86 /* addr - Pointer to native code for method */
88 /*------------------------------------------------------------------*/
91 mono_arch_get_unbox_trampoline (MonoMethod
*method
, gpointer addr
)
94 int this_pos
= s390_r2
;
95 MonoDomain
*domain
= mono_domain_get ();
98 if (MONO_TYPE_ISSTRUCT (mono_method_signature (method
)->ret
))
101 start
= code
= mono_domain_code_reserve (domain
, 28);
103 s390_basr (code
, s390_r13
, 0);
105 s390_word (code
, addr
);
106 s390_l (code
, s390_r1
, 0, s390_r13
, 4);
107 s390_ahi (code
, this_pos
, sizeof(MonoObject
));
108 s390_br (code
, s390_r1
);
110 g_assert ((code
- start
) <= 28);
112 mono_arch_flush_icache (start
, code
- start
);
117 /*========================= End of Function ========================*/
119 /*------------------------------------------------------------------*/
121 /* Name - mono_arch_patch_callsite */
123 /* Function - Patch a non-virtual callsite so it calls @addr. */
125 /*------------------------------------------------------------------*/
128 mono_arch_patch_callsite (guint8
*method_start
, guint8
*orig_code
, guint8
*addr
)
131 unsigned short opcode
;
133 opcode
= *((unsigned short *) (orig_code
- 6));
134 /* This should be a 'brasl' instruction */
135 g_assert (opcode
== 0xc0e5);
137 displace
= ((gint32
) addr
- (gint32
) (orig_code
- 2)) / 2;
138 s390_patch (orig_code
, displace
);
139 mono_arch_flush_icache (orig_code
, 4);
142 /*========================= End of Function ========================*/
145 mono_arch_patch_plt_entry (guint8
*code
, gpointer
*got
, mgreg_t
*regs
, guint8
*addr
)
147 g_assert_not_reached ();
150 /*========================= End of Function ========================*/
152 /*------------------------------------------------------------------*/
154 /* Name - mono_arch_nullify_class_init_trampoline */
156 /* Function - Nullify a call which calls a class init trampoline */
158 /*------------------------------------------------------------------*/
161 mono_arch_nullify_class_init_trampoline (guint8
*code
, mgreg_t
*regs
)
163 char patch
[6] = {0x47, 0x00, 0x00, 0x00, 0x07, 0x00};
167 memcpy(code
, patch
, sizeof(patch
));
170 /*========================= End of Function ========================*/
173 mono_arch_nullify_plt_entry (guint8
*code
, mgreg_t
*regs
)
175 g_assert_not_reached ();
178 /*========================= End of Function ========================*/
180 /*------------------------------------------------------------------*/
182 /* Name - mono_arch_get_vcall_slot */
184 /* Function - This method is called by the arch independent */
185 /* trampoline code to determine the vtable slot used by */
186 /* the call which invoked the trampoline. */
188 /* generated by mono for S/390 will look like either:*/
189 /* 1. l %r1,xxx(%rx) */
191 /* 2. brasl %r14,xxxxxx */
193 /* Parameters - code - Pointer into caller code */
194 /* regs - Register state at the point of the call */
195 /* displacement - Out parameter which will receive */
196 /* the displacement of the vtable slot */
198 /*------------------------------------------------------------------*/
201 mono_arch_get_vcall_slot (guint8
*code
, mgreg_t
*regs
, int *displacement
)
205 unsigned short opcode
;
208 // We are passed sp instead of the register array
213 opcode
= *((unsigned short *) (code
- 6));
216 /* This is a bras r14,r1 instruction */
219 *displacement
= *((short *)code
) & 0x0fff;
221 base
= *((guchar
**) (sp
+ S390_REG_SAVE_OFFSET
+
222 sizeof(int)*(reg
-6)));
224 base
= *((guchar
**) ((sp
- CREATE_STACK_SIZE
) +
226 sizeof(int)*(reg
-2)));
229 /* l %r1,OFFSET(%r13,%r7) */
232 *displacement
= *((short *)code
) & 0x0fff;
234 base
= *((guchar
**) (sp
+ S390_REG_SAVE_OFFSET
+
235 sizeof(int)*(reg
-6)));
237 base
= *((guchar
**) ((sp
- CREATE_STACK_SIZE
) +
239 sizeof(int)*(reg
-2)));
240 base
+= *((guint32
*) (sp
+ S390_REG_SAVE_OFFSET
+
241 sizeof(int)*(s390_r13
-6)));
244 /* This is the 'brasl' instruction */
247 g_error("Unable to patch instruction prior to %p",code
);
253 /*========================= End of Function ========================*/
255 /*------------------------------------------------------------------*/
257 /* Name - mono_arch_create_trampoline_code */
259 /* Function - Create the designated type of trampoline according*/
260 /* to the 'tramp_type' parameter. */
262 /*------------------------------------------------------------------*/
265 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type
, MonoTrampInfo
**info
, gboolean aot
)
267 guint8
*buf
, *tramp
, *code
;
268 int i
, offset
, lmfOffset
;
274 /* Now we'll create in 'buf' the S/390 trampoline code. This
275 is the trampoline code common to all methods */
277 code
= buf
= mono_global_codeman_reserve (512);
279 /*-----------------------------------------------------------
280 STEP 0: First create a non-standard function prologue with a
281 stack size big enough to save our registers.
282 -----------------------------------------------------------*/
284 s390_stm (buf
, s390_r6
, s390_r14
, STK_BASE
, S390_REG_SAVE_OFFSET
);
285 s390_lr (buf
, s390_r11
, s390_r15
);
286 s390_ahi (buf
, STK_BASE
, -CREATE_STACK_SIZE
);
287 s390_st (buf
, s390_r11
, 0, STK_BASE
, 0);
288 s390_st (buf
, s390_r1
, 0, STK_BASE
, METHOD_SAVE_OFFSET
);
289 s390_stm (buf
, s390_r2
, s390_r5
, STK_BASE
, CREATE_GR_OFFSET
);
291 /* Save the FP registers */
292 offset
= CREATE_FP_OFFSET
;
293 for (i
= s390_f0
; i
<= s390_f15
; ++i
) {
294 s390_std (buf
, i
, 0, STK_BASE
, offset
);
298 /*----------------------------------------------------------
299 STEP 1: call 'mono_get_lmf_addr()' to get the address of our
300 LMF. We'll need to restore it after the call to
301 's390_magic_trampoline' and before the call to the native
303 ----------------------------------------------------------*/
305 s390_basr (buf
, s390_r13
, 0);
307 s390_word (buf
, mono_get_lmf_addr
);
308 s390_l (buf
, s390_r1
, 0, s390_r13
, 4);
309 s390_basr (buf
, s390_r14
, s390_r1
);
311 /*---------------------------------------------------------------*/
312 /* we build the MonoLMF structure on the stack - see mini-s390.h */
313 /* Keep in sync with the code in mono_arch_emit_prolog */
314 /*---------------------------------------------------------------*/
315 lmfOffset
= CREATE_STACK_SIZE
- sizeof(MonoLMF
);
317 s390_lr (buf
, s390_r13
, STK_BASE
);
318 s390_ahi (buf
, s390_r13
, lmfOffset
);
320 /*---------------------------------------------------------------*/
321 /* Set lmf.lmf_addr = jit_tls->lmf */
322 /*---------------------------------------------------------------*/
323 s390_st (buf
, s390_r2
, 0, s390_r13
,
324 G_STRUCT_OFFSET(MonoLMF
, lmf_addr
));
326 /*---------------------------------------------------------------*/
327 /* Get current lmf */
328 /*---------------------------------------------------------------*/
329 s390_l (buf
, s390_r0
, 0, s390_r2
, 0);
331 /*---------------------------------------------------------------*/
332 /* Set our lmf as the current lmf */
333 /*---------------------------------------------------------------*/
334 s390_st (buf
, s390_r13
, 0, s390_r2
, 0);
336 /*---------------------------------------------------------------*/
337 /* Have our lmf.previous_lmf point to the last lmf */
338 /*---------------------------------------------------------------*/
339 s390_st (buf
, s390_r0
, 0, s390_r13
,
340 G_STRUCT_OFFSET(MonoLMF
, previous_lmf
));
342 /*---------------------------------------------------------------*/
343 /* save method info */
344 /*---------------------------------------------------------------*/
345 s390_l (buf
, s390_r1
, 0, STK_BASE
, METHOD_SAVE_OFFSET
);
346 s390_st (buf
, s390_r1
, 0, s390_r13
,
347 G_STRUCT_OFFSET(MonoLMF
, method
));
349 /*---------------------------------------------------------------*/
350 /* save the current SP */
351 /*---------------------------------------------------------------*/
352 s390_l (buf
, s390_r1
, 0, STK_BASE
, 0);
353 s390_st (buf
, s390_r1
, 0, s390_r13
, G_STRUCT_OFFSET(MonoLMF
, ebp
));
355 /*---------------------------------------------------------------*/
356 /* save the current IP */
357 /*---------------------------------------------------------------*/
358 if (tramp_type
== MONO_TRAMPOLINE_JUMP
) {
359 s390_lhi (buf
, s390_r1
, 0);
361 s390_l (buf
, s390_r1
, 0, s390_r1
, S390_RET_ADDR_OFFSET
);
362 s390_la (buf
, s390_r1
, 0, s390_r1
, 0);
364 s390_st (buf
, s390_r1
, 0, s390_r13
, G_STRUCT_OFFSET(MonoLMF
, eip
));
366 /*---------------------------------------------------------------*/
367 /* Save general and floating point registers */
368 /*---------------------------------------------------------------*/
369 s390_stm (buf
, s390_r2
, s390_r12
, s390_r13
,
370 G_STRUCT_OFFSET(MonoLMF
, gregs
[2]));
371 for (i
= 0; i
< 16; i
++) {
372 s390_std (buf
, i
, 0, s390_r13
,
373 G_STRUCT_OFFSET(MonoLMF
, fregs
[i
]));
376 /*---------------------------------------------------------------*/
377 /* STEP 2: call the C trampoline function */
378 /*---------------------------------------------------------------*/
382 /* Arg 1: mgreg_t *regs. We pass sp instead */
383 s390_lr (buf
, s390_r2
, STK_BASE
);
384 s390_ahi (buf
, s390_r2
, CREATE_STACK_SIZE
);
386 /* Arg 2: code (next address to the instruction that called us) */
387 if (tramp_type
== MONO_TRAMPOLINE_JUMP
) {
388 s390_lhi (buf
, s390_r3
, 0);
390 s390_l (buf
, s390_r3
, 0, s390_r11
, S390_RET_ADDR_OFFSET
);
392 /* Mask out bit 31 */
393 s390_basr (buf
, s390_r13
, 0);
395 s390_word (buf
, (~(1 << 31)));
396 s390_n (buf
, s390_r3
, 0, s390_r13
, 4);
399 /* Arg 3: MonoMethod *method. It was put in r1 by the
400 method-specific trampoline code, and then saved before the call
401 to mono_get_lmf_addr()'. */
402 s390_l (buf
, s390_r4
, 0, STK_BASE
, METHOD_SAVE_OFFSET
);
404 /* Arg 4: trampoline address. Ignore for now */
406 /* Calculate call address and call the C trampoline. Return value will be in r2 */
407 s390_basr (buf
, s390_r13
, 0);
409 tramp
= (guint8
*)mono_get_trampoline_func (tramp_type
);
410 s390_word (buf
, tramp
);
411 s390_l (buf
, s390_r1
, 0, s390_r13
, 4);
412 s390_basr (buf
, s390_r14
, s390_r1
);
414 /* OK, code address is now on r2. Move it to r1, so that we
415 can restore r2 and use it from r1 later */
416 s390_lr (buf
, s390_r1
, s390_r2
);
418 /*----------------------------------------------------------
419 STEP 3: Restore the LMF
420 ----------------------------------------------------------*/
421 restoreLMF(buf
, STK_BASE
, CREATE_STACK_SIZE
);
423 /*----------------------------------------------------------
424 STEP 4: call the compiled method
425 ----------------------------------------------------------*/
427 /* Restore registers */
429 s390_lm (buf
, s390_r2
, s390_r5
, STK_BASE
, CREATE_GR_OFFSET
);
431 /* Restore the FP registers */
432 offset
= CREATE_FP_OFFSET
;
433 for (i
= s390_f0
; i
<= s390_f15
; ++i
) {
434 s390_ld (buf
, i
, 0, STK_BASE
, offset
);
438 /* Restore stack pointer and jump to the code -
439 R14 contains the return address to our caller */
440 s390_lr (buf
, STK_BASE
, s390_r11
);
441 s390_lm (buf
, s390_r6
, s390_r14
, STK_BASE
, S390_REG_SAVE_OFFSET
);
443 if (tramp_type
== MONO_TRAMPOLINE_CLASS_INIT
|| tramp_type
== MONO_TRAMPOLINE_GENERIC_CLASS_INIT
)
444 s390_br (buf
, s390_r14
);
446 s390_br (buf
, s390_r1
);
448 /* Flush instruction cache, since we've generated code */
449 mono_arch_flush_icache (code
, buf
- code
);
452 g_assert ((buf
- code
) <= 512);
457 /*========================= End of Function ========================*/
459 /*------------------------------------------------------------------*/
461 /* Name - mono_arch_create_specific_trampoline */
463 /* Function - Creates the given kind of specific trampoline */
465 /*------------------------------------------------------------------*/
468 mono_arch_create_specific_trampoline (gpointer arg1
, MonoTrampolineType tramp_type
, MonoDomain
*domain
, guint32
*code_len
)
470 guint8
*code
, *buf
, *tramp
;
473 tramp
= mono_get_trampoline_code (tramp_type
);
475 /*----------------------------------------------------------*/
476 /* This is the method-specific part of the trampoline. Its */
477 /* purpose is to provide the generic part with the */
478 /* MonoMethod *method pointer. We'll use r1 to keep it. */
479 /*----------------------------------------------------------*/
480 code
= buf
= mono_domain_code_reserve (domain
, SPECIFIC_TRAMPOLINE_SIZE
);
482 s390_basr (buf
, s390_r1
, 0);
484 s390_word (buf
, arg1
);
485 s390_l (buf
, s390_r1
, 0, s390_r1
, 4);
486 displace
= (tramp
- buf
) / 2;
487 s390_jcl (buf
, S390_CC_UN
, displace
);
489 /* Flush instruction cache, since we've generated code */
490 mono_arch_flush_icache (code
, buf
- code
);
493 g_assert ((buf
- code
) <= SPECIFIC_TRAMPOLINE_SIZE
);
496 *code_len
= buf
- code
;
501 /*========================= End of Function ========================*/
504 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot
, MonoTrampInfo
**info
, gboolean aot
)
506 /* FIXME: implement! */
507 g_assert_not_reached ();