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 start = code = mono_domain_code_reserve (domain, 28);
104 s390_basr (code, s390_r1, 0);
106 s390_llong(code, addr);
107 s390_lg (code, s390_r1, 0, s390_r1, 4);
108 s390_aghi (code, this_pos, sizeof(MonoObject));
109 s390_br (code, s390_r1);
111 g_assert ((code - start) <= 28);
113 mono_arch_flush_icache (start, code - start);
118 /*========================= End of Function ========================*/
120 /*------------------------------------------------------------------*/
122 /* Name - mono_arch_patch_callsite */
124 /* Function - Patch a non-virtual callsite so it calls @addr. */
126 /*------------------------------------------------------------------*/
129 mono_arch_patch_callsite (guint8 *method_start, guint8 *orig_code, guint8 *addr)
132 unsigned short opcode;
134 opcode = *((unsigned short *) (orig_code - 6));
135 if (opcode == 0xc0e5) {
136 /* This is the 'brasl' instruction */
138 displace = ((gssize) addr - (gssize) (orig_code - 2)) / 2;
139 s390_patch_rel (orig_code, displace);
140 mono_arch_flush_icache (orig_code, 4);
142 /* This should be a 'lg %r14,4(%r13)' then a 'basr r14, r14' instruction */
143 g_assert (orig_code [-8] == 0xe3);
144 g_assert (orig_code [-7] == 0xe0);
145 g_assert (orig_code [-6] == 0xd0);
146 g_assert (orig_code [-5] == 0x04);
147 g_assert (orig_code [-4] == 0x00);
148 g_assert (orig_code [-3] == 0x04);
149 opcode = *((unsigned short*) (orig_code - 2));
150 g_assert (opcode == 0x0dee);
152 /* The call address is stored in the 8 bytes preceeding the basr instruction */
153 s390_patch_addr(orig_code - 16, (gssize)addr);
154 mono_arch_flush_icache (orig_code - 16, 8);
158 /*========================= End of Function ========================*/
160 /*------------------------------------------------------------------*/
162 /* Name - mono_arch_patch_plt_entry. */
164 /* Function - Patch a PLT entry - unused as yet. */
166 /*------------------------------------------------------------------*/
169 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
171 g_assert_not_reached ();
174 /*========================= End of Function ========================*/
176 /*------------------------------------------------------------------*/
178 /* Name - mono_arch_nullify_class_init_trampoline */
180 /* Function - Nullify a call which calls a class init trampoline*/
182 /*------------------------------------------------------------------*/
185 mono_arch_nullify_class_init_trampoline (guint8 *code, mgreg_t *regs)
187 char patch[2] = {0x07, 0x00};
191 memcpy(code, patch, sizeof(patch));
194 /*========================= End of Function ========================*/
196 /*------------------------------------------------------------------*/
198 /* Name - mono_arch_nullify_plt_entry */
200 /* Function - Nullify a PLT entry call. */
202 /*------------------------------------------------------------------*/
205 mono_arch_nullify_plt_entry (guint8 *code, mgreg_t *regs)
207 g_assert_not_reached ();
210 /*========================= End of Function ========================*/
212 /*------------------------------------------------------------------*/
214 /* Name - mono_arch_get_vcall_slot */
216 /* Function - This method is called by the arch independent */
217 /* trampoline code to determine the vtable slot used by */
218 /* the call which invoked the trampoline. */
220 /* Parameters - code - Pointer into caller code */
221 /* regs - Register state at the point of the call */
222 /* displacement - Out parameter which will receive */
223 /* the displacement of the vtable slot */
225 /*------------------------------------------------------------------*/
228 mono_arch_get_vcall_slot (guint8 *code, mgreg_t *regs, int *displacement)
232 unsigned short opcode;
234 MonoLMF *lmf = (MonoLMF *) ((gchar *) regs - sizeof(MonoLMF));
236 // We are passed sp instead of the register array
240 sp = (char *) lmf->gregs[s390_r15];
244 opcode = *((unsigned short *) (code - 6));
245 if (opcode == 0xc0e5)
246 /* This is the 'brasl' instruction */
249 /*-----------------------------------*/
250 /* This is a basr r14,Rz instruction */
251 /* If it's preceded by a LG Rx,d(Ry) */
252 /* If Rz == 1 then this is virtual */
254 /*-----------------------------------*/
257 /*-----------------------------------*/
258 /* If call is preceded by LGR then */
259 /* there's nothing to patch */
260 /*-----------------------------------*/
261 if ((code[0] == 0xb9) && (code[1] == 0x04))
264 /*-----------------------------------*/
265 /* We back up until we're pointing at*/
266 /* the base/displacement portion of */
267 /* the LG instruction */
268 /*-----------------------------------*/
269 lkReg = code[5] & 0x0f;
271 /*-----------------------------------*/
272 /* The LG instruction has format: */
273 /* E3x0ylllhh04 - where: */
274 /* x = Rx; y = Ry; */
275 /* lll = low 12 bits of displacement */
276 /* hh = high 8 bits of displacement */
277 /*-----------------------------------*/
279 *displacement = (code[2] << 12) |
280 ((code[0] & 0x0f) << 8) |
284 *displacement |= 0xfff00000;
286 base = ((guchar *) lmf->gregs[reg]);
289 base = *((guchar **) (sp + S390_REG_SAVE_OFFSET +
290 sizeof(long)*(reg-6)));
292 base = *((guchar **) ((sp - CREATE_STACK_SIZE) +
294 sizeof(long)*(reg-2)));
297 /* Non virtual call */
303 /*========================= End of Function ========================*/
305 /*------------------------------------------------------------------*/
307 /* Name - mono_arch_create_trampoline_code */
309 /* Function - Create the designated type of trampoline according*/
310 /* to the 'tramp_type' parameter. */
312 /*------------------------------------------------------------------*/
315 mono_arch_create_generic_trampoline (MonoTrampolineType tramp_type, MonoTrampInfo **info, gboolean aot)
317 guint8 *buf, *tramp, *code;
318 int i, offset, lmfOffset;
324 /* Now we'll create in 'buf' the S/390 trampoline code. This
325 is the trampoline code common to all methods */
327 code = buf = mono_global_codeman_reserve(512);
329 /*-----------------------------------------------------------
330 STEP 0: First create a non-standard function prologue with a
331 stack size big enough to save our registers.
332 -----------------------------------------------------------*/
334 s390_stmg (buf, s390_r6, s390_r15, STK_BASE, S390_REG_SAVE_OFFSET);
335 s390_lgr (buf, s390_r11, s390_r15);
336 s390_aghi (buf, STK_BASE, -CREATE_STACK_SIZE);
337 s390_stg (buf, s390_r11, 0, STK_BASE, 0);
338 s390_stg (buf, s390_r1, 0, STK_BASE, METHOD_SAVE_OFFSET);
339 s390_stmg (buf, s390_r2, s390_r5, STK_BASE, CREATE_GR_OFFSET);
341 /* Save the FP registers */
342 offset = CREATE_FP_OFFSET;
343 for (i = s390_f0; i <= s390_f15; ++i) {
344 s390_std (buf, i, 0, STK_BASE, offset);
348 /*----------------------------------------------------------
349 STEP 1: call 'mono_get_lmf_addr()' to get the address of our
350 LMF. We'll need to restore it after the call to
351 's390_magic_trampoline' and before the call to the native
353 ----------------------------------------------------------*/
355 s390_basr (buf, s390_r13, 0);
357 s390_llong(buf, mono_get_lmf_addr);
358 s390_lg (buf, s390_r1, 0, s390_r13, 4);
359 s390_basr (buf, s390_r14, s390_r1);
361 /*---------------------------------------------------------------*/
362 /* we build the MonoLMF structure on the stack - see mini-s390.h */
363 /* Keep in sync with the code in mono_arch_emit_prolog */
364 /*---------------------------------------------------------------*/
365 lmfOffset = CREATE_STACK_SIZE - sizeof(MonoLMF);
367 s390_lgr (buf, s390_r13, STK_BASE);
368 s390_aghi (buf, s390_r13, lmfOffset);
370 /*---------------------------------------------------------------*/
371 /* Set lmf.lmf_addr = jit_tls->lmf */
372 /*---------------------------------------------------------------*/
373 s390_stg (buf, s390_r2, 0, s390_r13,
374 G_STRUCT_OFFSET(MonoLMF, lmf_addr));
376 /*---------------------------------------------------------------*/
377 /* Get current lmf */
378 /*---------------------------------------------------------------*/
379 s390_lg (buf, s390_r0, 0, s390_r2, 0);
381 /*---------------------------------------------------------------*/
382 /* Set our lmf as the current lmf */
383 /*---------------------------------------------------------------*/
384 s390_stg (buf, s390_r13, 0, s390_r2, 0);
386 /*---------------------------------------------------------------*/
387 /* Have our lmf.previous_lmf point to the last lmf */
388 /*---------------------------------------------------------------*/
389 s390_stg (buf, s390_r0, 0, s390_r13,
390 G_STRUCT_OFFSET(MonoLMF, previous_lmf));
392 /*---------------------------------------------------------------*/
393 /* save method info */
394 /*---------------------------------------------------------------*/
395 s390_lg (buf, s390_r1, 0, STK_BASE, METHOD_SAVE_OFFSET);
396 s390_stg (buf, s390_r1, 0, s390_r13,
397 G_STRUCT_OFFSET(MonoLMF, method));
399 /*---------------------------------------------------------------*/
400 /* save the current SP */
401 /*---------------------------------------------------------------*/
402 s390_lg (buf, s390_r1, 0, STK_BASE, 0);
403 s390_stg (buf, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, ebp));
405 /*---------------------------------------------------------------*/
406 /* save the current IP */
407 /*---------------------------------------------------------------*/
408 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
409 s390_lghi (buf, s390_r1, 0);
411 s390_lg (buf, s390_r1, 0, s390_r1, S390_RET_ADDR_OFFSET);
412 // s390_la (buf, s390_r1, 0, s390_r1, 0);
414 s390_stg (buf, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, eip));
416 /*---------------------------------------------------------------*/
417 /* Save general and floating point registers */
418 /*---------------------------------------------------------------*/
419 s390_mvc (buf, 4*sizeof(gulong), s390_r13, G_STRUCT_OFFSET(MonoLMF, gregs[2]),
420 STK_BASE, CREATE_GR_OFFSET);
421 s390_mvc (buf, 10*sizeof(gulong), s390_r13, G_STRUCT_OFFSET(MonoLMF, gregs[6]),
422 s390_r11, S390_REG_SAVE_OFFSET);
424 /* Simply copy fpregs already saved above */
425 s390_mvc (buf, 16*sizeof(double), s390_r13, G_STRUCT_OFFSET(MonoLMF, fregs[0]),
426 STK_BASE, CREATE_FP_OFFSET);
428 /*---------------------------------------------------------------*/
429 /* STEP 2: call the C trampoline function */
430 /*---------------------------------------------------------------*/
434 /* Arg 1: mgreg_t *regs. We pass sp instead */
435 s390_la (buf, s390_r2, 0, STK_BASE, CREATE_STACK_SIZE);
437 /* Arg 2: code (next address to the instruction that called us) */
438 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
439 s390_lghi (buf, s390_r3, 0);
441 s390_lg (buf, s390_r3, 0, s390_r11, S390_RET_ADDR_OFFSET);
444 /* Arg 3: MonoMethod *method. It was put in r1 by the
445 method-specific trampoline code, and then saved before the call
446 to mono_get_lmf_addr()'. */
447 s390_lg (buf, s390_r4, 0, STK_BASE, METHOD_SAVE_OFFSET);
449 /* Arg 4: trampoline address. Ignore for now */
451 /* Calculate call address and call the C trampoline. Return value will be in r2 */
452 s390_basr (buf, s390_r13, 0);
454 tramp = (guint8*)mono_get_trampoline_func (tramp_type);
455 s390_llong (buf, tramp);
456 s390_lg (buf, s390_r1, 0, s390_r13, 4);
457 s390_basr (buf, s390_r14, s390_r1);
459 /* OK, code address is now on r2. Move it to r1, so that we
460 can restore r2 and use it from r1 later */
461 s390_lgr (buf, s390_r1, s390_r2);
463 /*----------------------------------------------------------
464 STEP 3: Restore the LMF
465 ----------------------------------------------------------*/
466 restoreLMF(buf, STK_BASE, CREATE_STACK_SIZE);
468 /*----------------------------------------------------------
469 STEP 4: call the compiled method
470 ----------------------------------------------------------*/
472 /* Restore registers */
474 s390_lmg (buf, s390_r2, s390_r5, STK_BASE, CREATE_GR_OFFSET);
476 /* Restore the FP registers */
477 offset = CREATE_FP_OFFSET;
478 for (i = s390_f0; i <= s390_f15; ++i) {
479 s390_ld (buf, i, 0, STK_BASE, offset);
483 /* Restore stack pointer and jump to the code -
484 R14 contains the return address to our caller */
485 s390_lgr (buf, STK_BASE, s390_r11);
486 s390_lmg (buf, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
488 if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT || tramp_type == MONO_TRAMPOLINE_GENERIC_CLASS_INIT)
489 s390_br (buf, s390_r14);
491 s390_br (buf, s390_r1);
493 /* Flush instruction cache, since we've generated code */
494 mono_arch_flush_icache (code, buf - code);
497 g_assert ((buf - code) <= 512);
502 /*========================= End of Function ========================*/
504 /*------------------------------------------------------------------*/
506 /* Name - mono_arch_create_specific_trampoline */
508 /* Function - Creates the given kind of specific trampoline */
510 /*------------------------------------------------------------------*/
513 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
515 guint8 *code, *buf, *tramp;
518 tramp = mono_get_trampoline_code (tramp_type);
520 /*----------------------------------------------------------*/
521 /* This is the method-specific part of the trampoline. Its */
522 /* purpose is to provide the generic part with the */
523 /* MonoMethod *method pointer. We'll use r1 to keep it. */
524 /*----------------------------------------------------------*/
525 code = buf = mono_domain_code_reserve (domain, SPECIFIC_TRAMPOLINE_SIZE);
527 s390_basr (buf, s390_r1, 0);
529 s390_llong(buf, arg1);
530 s390_lg (buf, s390_r1, 0, s390_r1, 4);
531 displace = (tramp - buf) / 2;
532 s390_jcl (buf, S390_CC_UN, displace);
534 /* Flush instruction cache, since we've generated code */
535 mono_arch_flush_icache (code, buf - code);
538 g_assert ((buf - code) <= SPECIFIC_TRAMPOLINE_SIZE);
541 *code_len = buf - code;
546 /*========================= End of Function ========================*/
548 /*------------------------------------------------------------------*/
550 /* Name - mono_arch_create_rgctx_lazy_fetch_trampoline */
554 /*------------------------------------------------------------------*/
557 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 slot, MonoTrampInfo **info, gboolean aot)
559 /* FIXME: implement! */
560 g_assert_not_reached ();
564 /*========================= End of Function ========================*/