Changed TryPeek to handle race condition with Dequeue.
[mono.git] / mono / mini / tramp-s390x.c
1 /*------------------------------------------------------------------*/
2 /*                                                                  */
3 /* Name        - tramp-s390x.c                                      */
4 /*                                                                  */
5 /* Function    - JIT trampoline code for S/390.                     */
6 /*                                                                  */
7 /* Name        - Neale Ferguson (Neale.Ferguson@SoftwareAG-usa.com) */
8 /*                                                                  */
9 /* Date        - January, 2004                                      */
10 /*                                                                  */
11 /* Derivation  - From exceptions-x86 & exceptions-ppc               */
12 /*               Paolo Molaro (lupus@ximian.com)                    */
13 /*               Dietmar Maurer (dietmar@ximian.com)                */
14 /*                                                                  */
15 /* Copyright   - 2001 Ximian, Inc.                                  */
16 /*                                                                  */
17 /*------------------------------------------------------------------*/
18
19 /*------------------------------------------------------------------*/
20 /*                 D e f i n e s                                    */
21 /*------------------------------------------------------------------*/
22
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))
30 #define GENERIC_REG_OFFSET      CREATE_STACK_SIZE + \
31                                 S390_REG_SAVE_OFFSET + \
32                                 3*sizeof(long)
33
34 /*------------------------------------------------------------------*/
35 /* Method-specific trampoline code fragment sizes                   */
36 /*------------------------------------------------------------------*/
37 #define SPECIFIC_TRAMPOLINE_SIZE        96
38
39 /*========================= End of Defines =========================*/
40
41 /*------------------------------------------------------------------*/
42 /*                 I n c l u d e s                                  */
43 /*------------------------------------------------------------------*/
44
45 #include <config.h>
46 #include <glib.h>
47 #include <string.h>
48
49 #include <mono/metadata/appdomain.h>
50 #include <mono/metadata/marshal.h>
51 #include <mono/metadata/tabledefs.h>
52 #include <mono/arch/s390x/s390x-codegen.h>
53
54 #include "mini.h"
55 #include "mini-s390x.h"
56
57 /*========================= End of Includes ========================*/
58
59 /*------------------------------------------------------------------*/
60 /*                 T y p e d e f s                                  */
61 /*------------------------------------------------------------------*/
62
63 /*========================= End of Typedefs ========================*/
64
65 /*------------------------------------------------------------------*/
66 /*                   P r o t o t y p e s                            */
67 /*------------------------------------------------------------------*/
68
69 /*========================= End of Prototypes ======================*/
70
71 /*------------------------------------------------------------------*/
72 /*                 G l o b a l   V a r i a b l e s                  */
73 /*------------------------------------------------------------------*/
74
75
76 /*====================== End of Global Variables ===================*/
77
78 /*------------------------------------------------------------------*/
79 /*                                                                  */
80 /* Name         - mono_arch_get_unbox_trampoline                    */
81 /*                                                                  */
82 /* Function     - Return a pointer to a trampoline which does the   */
83 /*                unboxing before calling the method.               */
84 /*                                                                  */
85 /*                When value type methods are called through the    */
86 /*                vtable we need to unbox the 'this' argument.      */
87 /*                                                                  */
88 /* Parameters   - method - Methd pointer                            */
89 /*                addr   - Pointer to native code for method        */
90 /*                                                                  */
91 /*------------------------------------------------------------------*/
92
93 gpointer
94 mono_arch_get_unbox_trampoline (MonoMethod *method, gpointer addr)
95 {
96         guint8 *code, *start;
97         int this_pos = s390_r2;
98         MonoDomain *domain = mono_domain_get ();
99
100         start = code = mono_domain_code_reserve (domain, 28);
101
102         s390_basr (code, s390_r1, 0);
103         s390_j    (code, 6);
104         s390_llong(code, addr);
105         s390_lg   (code, s390_r1, 0, s390_r1, 4);
106         s390_aghi (code, this_pos, sizeof(MonoObject));
107         s390_br   (code, s390_r1);
108
109         g_assert ((code - start) <= 28);
110
111         mono_arch_flush_icache (start, code - start);
112
113         return start;
114 }
115
116 /*========================= End of Function ========================*/
117
118 /*------------------------------------------------------------------*/
119 /*                                                                  */
120 /* Name         - mono_arch_patch_callsite                          */
121 /*                                                                  */
122 /* Function     - Patch a non-virtual callsite so it calls @addr.   */
123 /*                                                                  */
124 /*------------------------------------------------------------------*/
125
126 void
127 mono_arch_patch_callsite (guint8 *method_start, guint8 *orig_code, guint8 *addr)
128 {
129         gint32 displace;
130         unsigned short opcode;
131
132         opcode = *((unsigned short *) (orig_code - 6));
133         if (opcode == 0xc0e5) {
134                 /* This is the 'brasl' instruction */
135                 orig_code    -= 4;
136                 displace = ((gssize) addr - (gssize) (orig_code - 2)) / 2;
137                 s390_patch_rel (orig_code, displace);
138                 mono_arch_flush_icache (orig_code, 4);
139         } else {
140                 /* This should be a 'lg %r14,4(%r13)' then a 'basr r14, r14' instruction */
141                 g_assert (orig_code [-8] == 0xe3);
142                 g_assert (orig_code [-7] == 0xe0);
143                 g_assert (orig_code [-6] == 0xd0);
144                 g_assert (orig_code [-5] == 0x04);
145                 g_assert (orig_code [-4] == 0x00);
146                 g_assert (orig_code [-3] == 0x04);
147                 opcode = *((unsigned short*) (orig_code - 2));
148                 g_assert (opcode == 0x0dee);
149
150                 /* The call address is stored in the 8 bytes preceeding the basr instruction */
151                 s390_patch_addr(orig_code - 16, (gssize)addr);
152                 mono_arch_flush_icache (orig_code - 16, 8);
153         }
154 }
155
156 /*========================= End of Function ========================*/
157
158 /*------------------------------------------------------------------*/
159 /*                                                                  */
160 /* Name         - mono_arch_patch_plt_entry.                        */
161 /*                                                                  */
162 /* Function     - Patch a PLT entry - unused as yet.                */
163 /*                                                                  */
164 /*------------------------------------------------------------------*/
165
166 void
167 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
168 {
169         g_assert_not_reached ();
170 }
171
172 /*========================= End of Function ========================*/
173
174 /*------------------------------------------------------------------*/
175 /*                                                                  */
176 /* Name         - mono_arch_nullify_class_init_trampoline           */
177 /*                                                                  */
178 /* Function     - Nullify a call which calls a class init trampoline*/
179 /*                                                                  */
180 /*------------------------------------------------------------------*/
181
182 void
183 mono_arch_nullify_class_init_trampoline (guint8 *code, mgreg_t *regs)
184 {
185         char patch[2] = {0x07, 0x00};
186
187         code = code - 2;
188
189         memcpy(code, patch, sizeof(patch));
190 }
191
192 /*========================= End of Function ========================*/
193
194 /*------------------------------------------------------------------*/
195 /*                                                                  */
196 /* Name         - mono_arch_get_nullified_class_init                */
197 /*                                                                  */
198 /* Function     - Nullify a PLT entry call.                         */
199 /*                                                                  */
200 /*------------------------------------------------------------------*/
201
202 gpointer
203 mono_arch_get_nullified_class_init_trampoline (MonoTrampInfo **info)
204 {
205         guint8 *buf, *code;
206
207         code = buf = mono_global_codeman_reserve (16);
208
209         s390_br (code, s390_r14);
210
211         if (info)
212                 *info = mono_tramp_info_create ("nullified_class_init_trampoline", 
213                                                 buf, code - buf, NULL, NULL);
214
215         return (buf);
216 }
217
218 /*========================= End of Function ========================*/
219
220 /*------------------------------------------------------------------*/
221 /*                                                                  */
222 /* Name         - mono_arch_create_trampoline_code                  */
223 /*                                                                  */
224 /* Function     - Create the designated type of trampoline according*/
225 /*                to the 'tramp_type' parameter.                    */
226 /*                                                                  */
227 /*------------------------------------------------------------------*/
228
229 guchar*
230 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
231 {
232         char *tramp_name;
233         guint8 *buf, *tramp, *code;
234         int i, offset, lmfOffset;
235         GSList *unwind_ops = NULL;
236         MonoJumpInfo *ji = NULL;
237
238         g_assert (!aot);
239
240         /* Now we'll create in 'buf' the S/390 trampoline code. This
241            is the trampoline code common to all methods  */
242                 
243         code = buf = mono_global_codeman_reserve(512);
244                 
245         /*-----------------------------------------------------------
246           STEP 0: First create a non-standard function prologue with a
247           stack size big enough to save our registers.
248           -----------------------------------------------------------*/
249                 
250         s390_stmg (buf, s390_r6, s390_r15, STK_BASE, S390_REG_SAVE_OFFSET);
251         s390_lgr  (buf, s390_r11, s390_r15);
252         s390_aghi (buf, STK_BASE, -CREATE_STACK_SIZE);
253         s390_stg  (buf, s390_r11, 0, STK_BASE, 0);
254         s390_stg  (buf, s390_r1, 0, STK_BASE, METHOD_SAVE_OFFSET);
255         s390_stmg (buf, s390_r2, s390_r5, STK_BASE, CREATE_GR_OFFSET);
256
257         /* Save the FP registers */
258         offset = CREATE_FP_OFFSET;
259         for (i = s390_f0; i <= s390_f15; ++i) {
260                 s390_std  (buf, i, 0, STK_BASE, offset);
261                 offset += 8;
262         }
263
264         /*----------------------------------------------------------
265           STEP 1: call 'mono_get_lmf_addr()' to get the address of our
266           LMF. We'll need to restore it after the call to
267           's390_magic_trampoline' and before the call to the native
268           method.
269           ----------------------------------------------------------*/
270                                 
271         s390_basr (buf, s390_r13, 0);
272         s390_j    (buf, 6);
273         s390_llong(buf, mono_get_lmf_addr);
274         s390_lg   (buf, s390_r1, 0, s390_r13, 4);
275         s390_basr (buf, s390_r14, s390_r1);
276
277         /*---------------------------------------------------------------*/
278         /* we build the MonoLMF structure on the stack - see mini-s390.h */
279         /* Keep in sync with the code in mono_arch_emit_prolog           */
280         /*---------------------------------------------------------------*/
281         lmfOffset = CREATE_STACK_SIZE - sizeof(MonoLMF);
282                                                                                         
283         s390_lgr   (buf, s390_r13, STK_BASE);
284         s390_aghi  (buf, s390_r13, lmfOffset);  
285                                                                                         
286         /*---------------------------------------------------------------*/     
287         /* Set lmf.lmf_addr = jit_tls->lmf                               */     
288         /*---------------------------------------------------------------*/     
289         s390_stg   (buf, s390_r2, 0, s390_r13,                          
290                             G_STRUCT_OFFSET(MonoLMF, lmf_addr));                        
291                                                                                         
292         /*---------------------------------------------------------------*/     
293         /* Get current lmf                                               */     
294         /*---------------------------------------------------------------*/     
295         s390_lg    (buf, s390_r0, 0, s390_r2, 0);                               
296                                                                                         
297         /*---------------------------------------------------------------*/     
298         /* Set our lmf as the current lmf                                */     
299         /*---------------------------------------------------------------*/     
300         s390_stg   (buf, s390_r13, 0, s390_r2, 0);                              
301                                                                                         
302         /*---------------------------------------------------------------*/     
303         /* Have our lmf.previous_lmf point to the last lmf               */     
304         /*---------------------------------------------------------------*/     
305         s390_stg   (buf, s390_r0, 0, s390_r13,                          
306                             G_STRUCT_OFFSET(MonoLMF, previous_lmf));                    
307                                                                                         
308         /*---------------------------------------------------------------*/     
309         /* save method info                                              */     
310         /*---------------------------------------------------------------*/     
311         s390_lg    (buf, s390_r1, 0, STK_BASE, METHOD_SAVE_OFFSET);
312         s390_stg   (buf, s390_r1, 0, s390_r13,                          
313                             G_STRUCT_OFFSET(MonoLMF, method));                          
314                                                                         
315         /*---------------------------------------------------------------*/     
316         /* save the current SP                                           */     
317         /*---------------------------------------------------------------*/     
318         s390_lg    (buf, s390_r1, 0, STK_BASE, 0);
319         s390_stg   (buf, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, ebp));  
320                                                                         
321         /*---------------------------------------------------------------*/     
322         /* save the current IP                                           */     
323         /*---------------------------------------------------------------*/     
324         if (tramp_type == MONO_TRAMPOLINE_JUMP) {
325                 s390_lghi  (buf, s390_r1, 0);
326         } else {
327                 s390_lg    (buf, s390_r1, 0, s390_r1, S390_RET_ADDR_OFFSET);
328                 //                      s390_la    (buf, s390_r1, 0, s390_r1, 0);
329         }
330         s390_stg   (buf, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, eip));  
331                                                                                         
332         /*---------------------------------------------------------------*/     
333         /* Save general and floating point registers                     */     
334         /*---------------------------------------------------------------*/     
335         s390_mvc   (buf, 4*sizeof(gulong), s390_r13, G_STRUCT_OFFSET(MonoLMF, gregs[2]), 
336                     STK_BASE, CREATE_GR_OFFSET);
337         s390_mvc   (buf, 10*sizeof(gulong), s390_r13, G_STRUCT_OFFSET(MonoLMF, gregs[6]), 
338                     s390_r11, S390_REG_SAVE_OFFSET);
339
340         /* Simply copy fpregs already saved above                        */
341         s390_mvc   (buf, 16*sizeof(double), s390_r13, G_STRUCT_OFFSET(MonoLMF, fregs[0]),
342                     STK_BASE, CREATE_FP_OFFSET);
343
344         /*---------------------------------------------------------------*/
345         /* STEP 2: call the C trampoline function                        */
346         /*---------------------------------------------------------------*/
347                                 
348         /* Set arguments */
349
350         /* Arg 1: mgreg_t *regs. We pass sp instead */
351         s390_la  (buf, s390_r2, 0, STK_BASE, CREATE_STACK_SIZE);
352                 
353         /* Arg 2: code (next address to the instruction that called us) */
354         if (tramp_type == MONO_TRAMPOLINE_JUMP) {
355                 s390_lghi (buf, s390_r3, 0);
356         } else {
357                 s390_lg   (buf, s390_r3, 0, s390_r11, S390_RET_ADDR_OFFSET);
358         }
359
360         /* Arg 3: Trampoline argument */
361         if (tramp_type == MONO_TRAMPOLINE_GENERIC_CLASS_INIT)
362                 s390_lg (buf, s390_r4, 0, STK_BASE, GENERIC_REG_OFFSET);
363         else
364                 s390_lg (buf, s390_r4, 0, STK_BASE, METHOD_SAVE_OFFSET);
365
366         /* Arg 4: trampoline address. Ignore for now */
367                 
368         /* Calculate call address and call the C trampoline. Return value will be in r2 */
369         s390_basr (buf, s390_r13, 0);
370         s390_j    (buf, 6);
371         tramp = (guint8*)mono_get_trampoline_func (tramp_type);
372         s390_llong (buf, tramp);
373         s390_lg   (buf, s390_r1, 0, s390_r13, 4);
374         s390_basr (buf, s390_r14, s390_r1);
375                 
376         /* OK, code address is now on r2. Move it to r1, so that we
377            can restore r2 and use it from r1 later */
378         s390_lgr  (buf, s390_r1, s390_r2);
379
380         /*----------------------------------------------------------
381           STEP 3: Restore the LMF
382           ----------------------------------------------------------*/
383         restoreLMF(buf, STK_BASE, CREATE_STACK_SIZE);
384         
385         /*----------------------------------------------------------
386           STEP 4: call the compiled method
387           ----------------------------------------------------------*/
388                 
389         /* Restore registers */
390
391         s390_lmg  (buf, s390_r2, s390_r5, STK_BASE, CREATE_GR_OFFSET);
392                 
393         /* Restore the FP registers */
394         offset = CREATE_FP_OFFSET;
395         for (i = s390_f0; i <= s390_f15; ++i) {
396                 s390_ld  (buf, i, 0, STK_BASE, offset);
397                 offset += 8;
398         }
399
400         /* Restore stack pointer and jump to the code -
401            R14 contains the return address to our caller */
402         s390_lgr  (buf, STK_BASE, s390_r11);
403         s390_lmg  (buf, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
404
405         if (MONO_TRAMPOLINE_TYPE_MUST_RETURN(tramp_type)) {
406                 s390_lgr (buf, s390_r2, s390_r1);
407                 s390_br  (buf, s390_r14);
408         } else {
409                 s390_br  (buf, s390_r1);
410         }
411
412         /* Flush instruction cache, since we've generated code */
413         mono_arch_flush_icache (code, buf - code);
414         
415         if (info) {
416                 tramp_name = mono_get_generic_trampoline_name (tramp_type);
417                 *info = mono_tramp_info_create (tramp_name, buf, buf - code, ji, unwind_ops);
418                 g_free (tramp_name);
419         }
420
421         /* Sanity check */
422         g_assert ((buf - code) <= 512);
423
424         return code;
425 }
426
427 /*========================= End of Function ========================*/
428
429 /*------------------------------------------------------------------*/
430 /*                                                                  */
431 /* Name         - mono_arch_create_specific_trampoline              */
432 /*                                                                  */
433 /* Function     - Creates the given kind of specific trampoline     */
434 /*                                                                  */
435 /*------------------------------------------------------------------*/
436
437 gpointer
438 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
439 {
440         guint8 *code, *buf, *tramp;
441         gint32 displace;
442
443         tramp = mono_get_trampoline_code (tramp_type);
444
445         /*----------------------------------------------------------*/
446         /* This is the method-specific part of the trampoline. Its  */
447         /* purpose is to provide the generic part with the          */
448         /* MonoMethod *method pointer. We'll use r1 to keep it.     */
449         /*----------------------------------------------------------*/
450         code = buf = mono_domain_code_reserve (domain, SPECIFIC_TRAMPOLINE_SIZE);
451
452         s390_basr (buf, s390_r1, 0);
453         s390_j    (buf, 6);
454         s390_llong(buf, arg1);
455         s390_lg   (buf, s390_r1, 0, s390_r1, 4);
456         displace = (tramp - buf) / 2;
457         s390_jg   (buf, displace);
458
459         /* Flush instruction cache, since we've generated code */
460         mono_arch_flush_icache (code, buf - code);
461
462         /* Sanity check */
463         g_assert ((buf - code) <= SPECIFIC_TRAMPOLINE_SIZE);
464
465         if (code_len)
466                 *code_len = buf - code;
467         
468         return code;
469 }       
470
471 /*========================= End of Function ========================*/
472
473 /*------------------------------------------------------------------*/
474 /*                                                                  */
475 /* Name         - mono_arch_create_rgctx_lazy_fetch_trampoline      */
476 /*                                                                  */
477 /* Function     -                                                   */
478 /*                                                                  */
479 /*------------------------------------------------------------------*/
480
481 gpointer
482 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
483 {
484 #ifdef MONO_ARCH_VTABLE_REG
485         guint8 *tramp;
486         guint8 *code, *buf;
487         guint8 **rgctx_null_jumps;
488         gint32 displace;
489         int tramp_size,
490             depth, 
491             index, 
492             iPatch = 0,
493             i;
494         gboolean mrgctx;
495         MonoJumpInfo *ji = NULL;
496         GSList *unwind_ops = NULL;
497
498         mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
499         index = MONO_RGCTX_SLOT_INDEX (slot);
500         if (mrgctx)
501                 index += MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT / sizeof (gpointer);
502         for (depth = 0; ; ++depth) {
503                 int size = mono_class_rgctx_get_array_size (depth, mrgctx);
504
505                 if (index < size - 1)
506                         break;
507                 index -= size - 1;
508         }
509
510         tramp_size = 48 + 16 * depth;
511         if (mrgctx)
512                 tramp_size += 4;
513         else
514                 tramp_size += 12;
515
516         code = buf = mono_global_codeman_reserve (tramp_size);
517
518         unwind_ops = mono_arch_get_cie_program ();
519
520         rgctx_null_jumps = g_malloc (sizeof (guint8*) * (depth + 2));
521
522         if (mrgctx) {
523                 /* get mrgctx ptr */
524                 s390_lgr (code, s390_r1, s390_r2);
525         } else {
526                 /* load rgctx ptr from vtable */
527                 s390_lg (code, s390_r1, 0, s390_r2, G_STRUCT_OFFSET(MonoVTable, runtime_generic_context));
528                 /* is the rgctx ptr null? */
529                 s390_ltgr (code, s390_r1, s390_r1);
530                 /* if yes, jump to actual trampoline */
531                 rgctx_null_jumps [iPatch++] = code;
532                 s390_jge (code, 0);
533         }
534
535         for (i = 0; i < depth; ++i) {
536                 /* load ptr to next array */
537                 if (mrgctx && i == 0)
538                         s390_lg (code, s390_r1, 0, s390_r1, MONO_SIZEOF_METHOD_RUNTIME_GENERIC_CONTEXT);
539                 else
540                         s390_lg (code, s390_r1, 0, s390_r1, 0);
541                 s390_ltgr (code, s390_r1, s390_r1);
542                 /* if the ptr is null then jump to actual trampoline */
543                 rgctx_null_jumps [iPatch++] = code;
544                 s390_jge (code, 0);
545         }
546
547         /* fetch slot */
548         s390_lg (code, s390_r1, 0, s390_r1, (sizeof (gpointer) * (index  + 1)));
549         /* is the slot null? */
550         s390_ltgr (code, s390_r1, s390_r1);
551         /* if yes, jump to actual trampoline */
552         rgctx_null_jumps [iPatch++] = code;
553         s390_jge (code, 0);
554         /* otherwise return r1 */
555         s390_lgr (code, s390_r2, s390_r1);
556         s390_br  (code, s390_r14);
557
558         for (i = 0; i < iPatch; i++) {
559                 displace = ((uintptr_t) code - (uintptr_t) rgctx_null_jumps[i]) / 2;
560                 s390_patch_rel ((rgctx_null_jumps [i] + 2), displace);
561         }
562
563         g_free (rgctx_null_jumps);
564
565         /* move the rgctx pointer to the VTABLE register */
566         s390_lgr (code, MONO_ARCH_VTABLE_REG, s390_r2);
567
568         tramp = mono_arch_create_specific_trampoline (GUINT_TO_POINTER (slot),
569                 MONO_TRAMPOLINE_RGCTX_LAZY_FETCH, mono_get_root_domain (), NULL);
570
571         /* jump to the actual trampoline */
572         displace = (tramp - code) / 2;
573         s390_jg (code, displace);
574
575         mono_arch_flush_icache (buf, code - buf);
576
577         g_assert (code - buf <= tramp_size);
578
579         if (info) {
580                 char *name = mono_get_rgctx_fetch_trampoline_name (slot);
581                 *info = mono_tramp_info_create (name, buf, code - buf, ji, unwind_ops);
582                 g_free (name);
583         }
584
585         return(buf);
586 #else
587         g_assert_not_reached ();
588 #endif
589         return(NULL);
590 }       
591
592 /*========================= End of Function ========================*/
593
594 /*------------------------------------------------------------------*/
595 /*                                                                  */
596 /* Name         - mono_arch_get_static_rgctx_trampoline             */
597 /*                                                                  */
598 /* Function     - Create a trampoline which sets RGCTX_REG to MRGCTX*/
599 /*                then jumps to ADDR.                               */
600 /*                                                                  */
601 /*------------------------------------------------------------------*/
602
603 gpointer
604 mono_arch_get_static_rgctx_trampoline (MonoMethod *m, 
605                                         MonoMethodRuntimeGenericContext *mrgctx, 
606                                         gpointer addr)
607 {
608         guint8 *code, *start;
609         gint32 displace;
610         int buf_len;
611
612         MonoDomain *domain = mono_domain_get ();
613
614         buf_len = 32;
615
616         start = code = mono_domain_code_reserve (domain, buf_len);
617
618         s390_basr (code, s390_r1, 0);
619         s390_j    (code, 6);
620         s390_llong(code, mrgctx);
621         s390_lg   (code, MONO_ARCH_RGCTX_REG, 0, s390_r1, 4);
622         displace = ((uintptr_t) addr - (uintptr_t) code) / 2;
623         s390_jg   (code, displace);
624         g_assert ((code - start) < buf_len);
625
626         mono_arch_flush_icache (start, code - start);
627
628         return(start);
629 }       
630
631 /*========================= End of Function ========================*/
632
633 /*------------------------------------------------------------------*/
634 /*                                                                  */
635 /* Name         - mono_arch_create_generic_class_init_trampoline    */
636 /*                                                                  */
637 /* Function     -                                                   */
638 /*                                                                  */
639 /*------------------------------------------------------------------*/
640
641 gpointer
642 mono_arch_create_generic_class_init_trampoline (MonoTrampInfo **info, gboolean aot)
643 {
644         guint8 *tramp;
645         guint8 *code, *buf;
646         static int byte_offset = -1;
647         static guint8 bitmask;
648         guint8 *jump;
649         gint32 displace;
650         int tramp_size;
651         GSList *unwind_ops = NULL;
652         MonoJumpInfo *ji = NULL;
653
654         tramp_size = 48;
655
656         code = buf = mono_global_codeman_reserve (tramp_size);
657
658         unwind_ops = mono_arch_get_cie_program ();
659
660         if (byte_offset < 0)
661                 mono_marshal_find_bitfield_offset (MonoVTable, initialized, &byte_offset, &bitmask);
662
663         s390_llgc(code, s390_r0, 0, MONO_ARCH_VTABLE_REG, byte_offset);
664         s390_nill(code, s390_r0, bitmask);
665         s390_bnzr(code, s390_r14);
666
667         tramp = mono_arch_create_specific_trampoline (NULL, MONO_TRAMPOLINE_GENERIC_CLASS_INIT,
668                 mono_get_root_domain (), NULL);
669
670         /* jump to the actual trampoline */
671         displace = (tramp - code) / 2;
672         s390_jg (code, displace);
673
674         mono_arch_flush_icache (buf, code - buf);
675
676         g_assert (code - buf <= tramp_size);
677
678         if (info)
679                 *info = mono_tramp_info_create ("generic_class_init_trampoline", buf, code - buf, ji, unwind_ops);
680
681         return(buf);
682 }
683
684 /*========================= End of Function ========================*/