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+8
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 /* Method-specific trampoline code fragment sizes */
33 /*------------------------------------------------------------------*/
34 #define SPECIFIC_TRAMPOLINE_SIZE 96
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/s390x/s390x-codegen.h>
52 #include "mini-s390x.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 - gsctx - Generic sharing context */
86 /* method - Methd pointer */
87 /* addr - Pointer to native code for method */
89 /*------------------------------------------------------------------*/
92 mono_arch_get_unbox_trampoline (MonoGenericSharingContext
*gsctx
, MonoMethod
*method
, gpointer addr
)
95 int this_pos
= s390_r2
;
96 MonoDomain
*domain
= mono_domain_get ();
99 if (MONO_TYPE_ISSTRUCT (mono_method_signature (method
)->ret
))
102 mono_domain_lock (domain
);
103 start
= code
= mono_code_manager_reserve (domain
->code_mp
, 28);
104 mono_domain_unlock (domain
);
106 s390_basr (code
, s390_r1
, 0);
108 s390_llong(code
, addr
);
109 s390_lg (code
, s390_r1
, 0, s390_r1
, 4);
110 s390_aghi (code
, this_pos
, sizeof(MonoObject
));
111 s390_br (code
, s390_r1
);
113 g_assert ((code
- start
) <= 28);
115 mono_arch_flush_icache (start
, code
- start
);
120 /*========================= End of Function ========================*/
122 /*------------------------------------------------------------------*/
124 /* Name - mono_arch_patch_callsite */
126 /* Function - Patch a non-virtual callsite so it calls @addr. */
128 /*------------------------------------------------------------------*/
131 mono_arch_patch_callsite (guint8
*method_start
, guint8
*orig_code
, guint8
*addr
)
134 unsigned short opcode
;
136 opcode
= *((unsigned short *) (orig_code
- 6));
137 if (opcode
== 0xc0e5) {
138 /* This is the 'brasl' instruction */
140 displace
= ((gssize
) addr
- (gssize
) (orig_code
- 2)) / 2;
141 s390_patch_rel (orig_code
, displace
);
142 mono_arch_flush_icache (orig_code
, 4);
144 /* This should be a 'lg %r14,4(%r13)' then a 'basr r14, r14' instruction */
145 g_assert (orig_code
[-8] == 0xe3);
146 g_assert (orig_code
[-7] == 0xe0);
147 g_assert (orig_code
[-6] == 0xd0);
148 g_assert (orig_code
[-5] == 0x04);
149 g_assert (orig_code
[-4] == 0x00);
150 g_assert (orig_code
[-3] == 0x04);
151 opcode
= *((unsigned short*) (orig_code
- 2));
152 g_assert (opcode
== 0x0dee);
154 /* The call address is stored in the 8 bytes preceeding the basr instruction */
155 s390_patch_addr(orig_code
- 16, (gssize
)addr
);
156 mono_arch_flush_icache (orig_code
- 16, 8);
160 /*========================= End of Function ========================*/
163 mono_arch_patch_plt_entry (guint8
*code
, guint8
*addr
)
165 g_assert_not_reached ();
168 /*========================= End of Function ========================*/
170 /*------------------------------------------------------------------*/
172 /* Name - mono_arch_nullify_class_init_trampoline */
174 /* Function - Nullify a call which calls a class init trampoline */
176 /*------------------------------------------------------------------*/
179 mono_arch_nullify_class_init_trampoline (guint8
*code
, gssize
*regs
)
181 char patch
[2] = {0x07, 0x00};
185 memcpy(code
, patch
, sizeof(patch
));
188 /*========================= End of Function ========================*/
191 mono_arch_nullify_plt_entry (guint8
*code
)
193 g_assert_not_reached ();
196 /*========================= End of Function ========================*/
198 /*------------------------------------------------------------------*/
200 /* Name - mono_arch_get_vcall_slot */
202 /* Function - This method is called by the arch independent */
203 /* trampoline code to determine the vtable slot used by */
204 /* the call which invoked the trampoline. */
206 /* Parameters - code - Pointer into caller code */
207 /* regs - Register state at the point of the call */
208 /* displacement - Out parameter which will receive */
209 /* the displacement of the vtable slot */
211 /*------------------------------------------------------------------*/
214 mono_arch_get_vcall_slot (guint8
*code
, gpointer
*regs
, int *displacement
)
218 unsigned short opcode
;
221 // We are passed sp instead of the register array
226 opcode
= *((unsigned short *) (code
- 6));
227 if (opcode
== 0xc0e5)
228 /* This is the 'brasl' instruction */
231 /*-----------------------------------*/
232 /* This is a bras r14,Rz instruction */
233 /* If it's preceded by a LG Rx,d(Ry) */
234 /* If Rz == 1 then this is virtual */
236 /*-----------------------------------*/
239 /*-----------------------------------*/
240 /* If call is preceded by LGR then */
241 /* there's nothing to patch */
242 /*-----------------------------------*/
243 if ((code
[0] == 0xb9) &&
247 /*-----------------------------------*/
248 /* We back up until we're pointing at*/
249 /* the base/displacement portion of */
250 /* the LG instruction */
251 /*-----------------------------------*/
252 lkReg
= code
[5] & 0x0f;
254 /*-----------------------------------*/
255 /* The LG instruction has format: */
256 /* E3x0ylllhh04 - where: */
257 /* x = Rx; y = Ry; */
258 /* lll = low 12 bits of displacement */
259 /* hh = high 8 bits of displacement */
260 /*-----------------------------------*/
262 *displacement
= (code
[2] << 12) +
263 ((code
[0] & 0x0f) << 8) +
267 base
= *((guchar
**) (sp
+ S390_REG_SAVE_OFFSET
+
268 sizeof(long)*(reg
-6)));
270 base
= *((guchar
**) ((sp
- CREATE_STACK_SIZE
) +
272 sizeof(long)*(reg
-2)));
274 /* Non virtual call */
280 /*========================= End of Function ========================*/
283 mono_arch_get_vcall_slot_addr (guint8
* code
, gpointer
*regs
)
287 vt
= mono_arch_get_vcall_slot (code
, regs
, &displacement
);
290 return (gpointer
*)((char*)vt
+ displacement
);
293 /*========================= End of Function ========================*/
295 /*------------------------------------------------------------------*/
297 /* Name - mono_arch_create_trampoline_code */
299 /* Function - Create the designated type of trampoline according*/
300 /* to the 'tramp_type' parameter. */
302 /*------------------------------------------------------------------*/
305 mono_arch_create_trampoline_code (MonoTrampolineType tramp_type
)
308 guint8
*buf
, *tramp
, *code
;
309 int i
, offset
, lmfOffset
;
311 /* Now we'll create in 'buf' the S/390 trampoline code. This
312 is the trampoline code common to all methods */
314 code
= buf
= mono_global_codeman_reserve(512);
316 /*-----------------------------------------------------------
317 STEP 0: First create a non-standard function prologue with a
318 stack size big enough to save our registers.
319 -----------------------------------------------------------*/
321 s390_stmg (buf
, s390_r6
, s390_r14
, STK_BASE
, S390_REG_SAVE_OFFSET
);
322 s390_lgr (buf
, s390_r11
, s390_r15
);
323 s390_aghi (buf
, STK_BASE
, -CREATE_STACK_SIZE
);
324 s390_stg (buf
, s390_r11
, 0, STK_BASE
, 0);
325 s390_stg (buf
, s390_r1
, 0, STK_BASE
, METHOD_SAVE_OFFSET
);
326 s390_stmg (buf
, s390_r2
, s390_r5
, STK_BASE
, CREATE_GR_OFFSET
);
328 /* Save the FP registers */
329 offset
= CREATE_FP_OFFSET
;
330 for (i
= s390_f0
; i
<= s390_f15
; ++i
) {
331 s390_std (buf
, i
, 0, STK_BASE
, offset
);
335 /*----------------------------------------------------------
336 STEP 1: call 'mono_get_lmf_addr()' to get the address of our
337 LMF. We'll need to restore it after the call to
338 's390_magic_trampoline' and before the call to the native
340 ----------------------------------------------------------*/
342 s390_basr (buf
, s390_r13
, 0);
344 s390_llong(buf
, mono_get_lmf_addr
);
345 s390_lg (buf
, s390_r1
, 0, s390_r13
, 4);
346 s390_basr (buf
, s390_r14
, s390_r1
);
348 /*---------------------------------------------------------------*/
349 /* we build the MonoLMF structure on the stack - see mini-s390.h */
350 /* Keep in sync with the code in mono_arch_emit_prolog */
351 /*---------------------------------------------------------------*/
352 lmfOffset
= CREATE_STACK_SIZE
- sizeof(MonoLMF
);
354 s390_lgr (buf
, s390_r13
, STK_BASE
);
355 s390_aghi (buf
, s390_r13
, lmfOffset
);
357 /*---------------------------------------------------------------*/
358 /* Set lmf.lmf_addr = jit_tls->lmf */
359 /*---------------------------------------------------------------*/
360 s390_stg (buf
, s390_r2
, 0, s390_r13
,
361 G_STRUCT_OFFSET(MonoLMF
, lmf_addr
));
363 /*---------------------------------------------------------------*/
364 /* Get current lmf */
365 /*---------------------------------------------------------------*/
366 s390_lg (buf
, s390_r0
, 0, s390_r2
, 0);
368 /*---------------------------------------------------------------*/
369 /* Set our lmf as the current lmf */
370 /*---------------------------------------------------------------*/
371 s390_stg (buf
, s390_r13
, 0, s390_r2
, 0);
373 /*---------------------------------------------------------------*/
374 /* Have our lmf.previous_lmf point to the last lmf */
375 /*---------------------------------------------------------------*/
376 s390_stg (buf
, s390_r0
, 0, s390_r13
,
377 G_STRUCT_OFFSET(MonoLMF
, previous_lmf
));
379 /*---------------------------------------------------------------*/
380 /* save method info */
381 /*---------------------------------------------------------------*/
382 s390_lg (buf
, s390_r1
, 0, STK_BASE
, METHOD_SAVE_OFFSET
);
383 s390_stg (buf
, s390_r1
, 0, s390_r13
,
384 G_STRUCT_OFFSET(MonoLMF
, method
));
386 /*---------------------------------------------------------------*/
387 /* save the current SP */
388 /*---------------------------------------------------------------*/
389 s390_lg (buf
, s390_r1
, 0, STK_BASE
, 0);
390 s390_stg (buf
, s390_r1
, 0, s390_r13
, G_STRUCT_OFFSET(MonoLMF
, ebp
));
392 /*---------------------------------------------------------------*/
393 /* save the current IP */
394 /*---------------------------------------------------------------*/
395 if (tramp_type
== MONO_TRAMPOLINE_JUMP
) {
396 s390_lghi (buf
, s390_r1
, 0);
398 s390_lg (buf
, s390_r1
, 0, s390_r1
, S390_RET_ADDR_OFFSET
);
399 // s390_la (buf, s390_r1, 0, s390_r1, 0);
401 s390_stg (buf
, s390_r1
, 0, s390_r13
, G_STRUCT_OFFSET(MonoLMF
, eip
));
403 /*---------------------------------------------------------------*/
404 /* Save general and floating point registers */
405 /*---------------------------------------------------------------*/
406 s390_stmg (buf
, s390_r2
, s390_r12
, s390_r13
,
407 G_STRUCT_OFFSET(MonoLMF
, gregs
[2]));
408 for (i
= 0; i
< 16; i
++) {
409 s390_std (buf
, i
, 0, s390_r13
,
410 G_STRUCT_OFFSET(MonoLMF
, fregs
[i
]));
413 /*---------------------------------------------------------------*/
414 /* STEP 2: call the C trampoline function */
415 /*---------------------------------------------------------------*/
419 /* Arg 1: gssize *regs. We pass sp instead */
420 s390_lgr (buf
, s390_r2
, STK_BASE
);
421 s390_ahi (buf
, s390_r2
, CREATE_STACK_SIZE
);
423 /* Arg 2: code (next address to the instruction that called us) */
424 if (tramp_type
== MONO_TRAMPOLINE_JUMP
) {
425 s390_lghi (buf
, s390_r3
, 0);
427 s390_lg (buf
, s390_r3
, 0, s390_r11
, S390_RET_ADDR_OFFSET
);
430 /* Arg 3: MonoMethod *method. It was put in r1 by the
431 method-specific trampoline code, and then saved before the call
432 to mono_get_lmf_addr()'. */
433 s390_lg (buf
, s390_r4
, 0, STK_BASE
, METHOD_SAVE_OFFSET
);
435 /* Arg 4: trampoline address. Ignore for now */
437 /* Calculate call address and call the C trampoline. Return value will be in r2 */
438 s390_basr (buf
, s390_r13
, 0);
440 tramp
= (guint8
*)mono_get_trampoline_func (tramp_type
);
441 s390_llong (buf
, tramp
);
442 s390_lg (buf
, s390_r1
, 0, s390_r13
, 4);
443 s390_basr (buf
, s390_r14
, s390_r1
);
445 /* OK, code address is now on r2. Move it to r1, so that we
446 can restore r2 and use it from r1 later */
447 s390_lgr (buf
, s390_r1
, s390_r2
);
449 /*----------------------------------------------------------
450 STEP 3: Restore the LMF
451 ----------------------------------------------------------*/
452 restoreLMF(buf
, STK_BASE
, CREATE_STACK_SIZE
);
454 /*----------------------------------------------------------
455 STEP 4: call the compiled method
456 ----------------------------------------------------------*/
458 /* Restore registers */
460 s390_lmg (buf
, s390_r2
, s390_r5
, STK_BASE
, CREATE_GR_OFFSET
);
462 /* Restore the FP registers */
463 offset
= CREATE_FP_OFFSET
;
464 for (i
= s390_f0
; i
<= s390_f15
; ++i
) {
465 s390_ld (buf
, i
, 0, STK_BASE
, offset
);
469 /* Restore stack pointer and jump to the code -
470 R14 contains the return address to our caller */
471 s390_lgr (buf
, STK_BASE
, s390_r11
);
472 s390_lmg (buf
, s390_r6
, s390_r14
, STK_BASE
, S390_REG_SAVE_OFFSET
);
474 if (tramp_type
== MONO_TRAMPOLINE_CLASS_INIT
|| tramp_type
== MONO_TRAMPOLINE_GENERIC_CLASS_INIT
)
475 s390_br (buf
, s390_r14
);
477 s390_br (buf
, s390_r1
);
479 /* Flush instruction cache, since we've generated code */
480 mono_arch_flush_icache (code
, buf
- code
);
483 g_assert ((buf
- code
) <= 512);
488 /*========================= End of Function ========================*/
490 /*------------------------------------------------------------------*/
492 /* Name - mono_arch_create_specific_trampoline */
494 /* Function - Creates the given kind of specific trampoline */
496 /*------------------------------------------------------------------*/
499 mono_arch_create_specific_trampoline (gpointer arg1
, MonoTrampolineType tramp_type
, MonoDomain
*domain
, guint32
*code_len
)
501 guint8
*code
, *buf
, *tramp
;
504 tramp
= mono_get_trampoline_code (tramp_type
);
506 /*----------------------------------------------------------*/
507 /* This is the method-specific part of the trampoline. Its */
508 /* purpose is to provide the generic part with the */
509 /* MonoMethod *method pointer. We'll use r1 to keep it. */
510 /*----------------------------------------------------------*/
511 mono_domain_lock (domain
);
512 code
= buf
= mono_code_manager_reserve (domain
->code_mp
, SPECIFIC_TRAMPOLINE_SIZE
);
513 mono_domain_unlock (domain
);
515 s390_basr (buf
, s390_r1
, 0);
517 s390_llong(buf
, arg1
);
518 s390_lg (buf
, s390_r1
, 0, s390_r1
, 4);
519 displace
= (tramp
- buf
) / 2;
520 s390_jcl (buf
, S390_CC_UN
, displace
);
522 /* Flush instruction cache, since we've generated code */
523 mono_arch_flush_icache (code
, buf
- code
);
526 g_assert ((buf
- code
) <= SPECIFIC_TRAMPOLINE_SIZE
);
529 *code_len
= buf
- code
;
534 /*========================= End of Function ========================*/
537 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 encoded_offset
)
539 /* FIXME: implement! */
540 g_assert_not_reached ();