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 ========================*/
161 mono_arch_patch_plt_entry (guint8 *code, gpointer *got, mgreg_t *regs, guint8 *addr)
163 g_assert_not_reached ();
166 /*========================= End of Function ========================*/
168 /*------------------------------------------------------------------*/
170 /* Name - mono_arch_nullify_class_init_trampoline */
172 /* Function - Nullify a call which calls a class init trampoline */
174 /*------------------------------------------------------------------*/
177 mono_arch_nullify_class_init_trampoline (guint8 *code, mgreg_t *regs)
179 char patch[2] = {0x07, 0x00};
183 memcpy(code, patch, sizeof(patch));
186 /*========================= End of Function ========================*/
189 mono_arch_nullify_plt_entry (guint8 *code, mgreg_t *regs)
191 g_assert_not_reached ();
194 /*========================= End of Function ========================*/
196 /*------------------------------------------------------------------*/
198 /* Name - mono_arch_get_vcall_slot */
200 /* Function - This method is called by the arch independent */
201 /* trampoline code to determine the vtable slot used by */
202 /* the call which invoked the trampoline. */
204 /* Parameters - code - Pointer into caller code */
205 /* regs - Register state at the point of the call */
206 /* displacement - Out parameter which will receive */
207 /* the displacement of the vtable slot */
209 /*------------------------------------------------------------------*/
212 mono_arch_get_vcall_slot (guint8 *code, mgreg_t *regs, int *displacement)
216 unsigned short opcode;
219 // We are passed sp instead of the register array
224 opcode = *((unsigned short *) (code - 6));
225 if (opcode == 0xc0e5)
226 /* This is the 'brasl' instruction */
229 /*-----------------------------------*/
230 /* This is a bras r14,Rz instruction */
231 /* If it's preceded by a LG Rx,d(Ry) */
232 /* If Rz == 1 then this is virtual */
234 /*-----------------------------------*/
237 /*-----------------------------------*/
238 /* If call is preceded by LGR then */
239 /* there's nothing to patch */
240 /*-----------------------------------*/
241 if ((code[0] == 0xb9) &&
245 /*-----------------------------------*/
246 /* We back up until we're pointing at*/
247 /* the base/displacement portion of */
248 /* the LG instruction */
249 /*-----------------------------------*/
250 lkReg = code[5] & 0x0f;
252 /*-----------------------------------*/
253 /* The LG instruction has format: */
254 /* E3x0ylllhh04 - where: */
255 /* x = Rx; y = Ry; */
256 /* lll = low 12 bits of displacement */
257 /* hh = high 8 bits of displacement */
258 /*-----------------------------------*/
260 *displacement = (code[2] << 12) +
261 ((code[0] & 0x0f) << 8) +
265 base = *((guchar **) (sp + S390_REG_SAVE_OFFSET +
266 sizeof(long)*(reg-6)));
268 base = *((guchar **) ((sp - CREATE_STACK_SIZE) +
270 sizeof(long)*(reg-2)));
272 /* Non virtual call */
278 /*========================= End of Function ========================*/
280 /*------------------------------------------------------------------*/
282 /* Name - mono_arch_create_trampoline_code */
284 /* Function - Create the designated type of trampoline according*/
285 /* to the 'tramp_type' parameter. */
287 /*------------------------------------------------------------------*/
290 mono_arch_create_trampoline_code (MonoTrampolineType tramp_type)
293 guint8 *buf, *tramp, *code;
294 int i, offset, lmfOffset;
296 /* Now we'll create in 'buf' the S/390 trampoline code. This
297 is the trampoline code common to all methods */
299 code = buf = mono_global_codeman_reserve(512);
301 /*-----------------------------------------------------------
302 STEP 0: First create a non-standard function prologue with a
303 stack size big enough to save our registers.
304 -----------------------------------------------------------*/
306 s390_stmg (buf, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
307 s390_lgr (buf, s390_r11, s390_r15);
308 s390_aghi (buf, STK_BASE, -CREATE_STACK_SIZE);
309 s390_stg (buf, s390_r11, 0, STK_BASE, 0);
310 s390_stg (buf, s390_r1, 0, STK_BASE, METHOD_SAVE_OFFSET);
311 s390_stmg (buf, s390_r2, s390_r5, STK_BASE, CREATE_GR_OFFSET);
313 /* Save the FP registers */
314 offset = CREATE_FP_OFFSET;
315 for (i = s390_f0; i <= s390_f15; ++i) {
316 s390_std (buf, i, 0, STK_BASE, offset);
320 /*----------------------------------------------------------
321 STEP 1: call 'mono_get_lmf_addr()' to get the address of our
322 LMF. We'll need to restore it after the call to
323 's390_magic_trampoline' and before the call to the native
325 ----------------------------------------------------------*/
327 s390_basr (buf, s390_r13, 0);
329 s390_llong(buf, mono_get_lmf_addr);
330 s390_lg (buf, s390_r1, 0, s390_r13, 4);
331 s390_basr (buf, s390_r14, s390_r1);
333 /*---------------------------------------------------------------*/
334 /* we build the MonoLMF structure on the stack - see mini-s390.h */
335 /* Keep in sync with the code in mono_arch_emit_prolog */
336 /*---------------------------------------------------------------*/
337 lmfOffset = CREATE_STACK_SIZE - sizeof(MonoLMF);
339 s390_lgr (buf, s390_r13, STK_BASE);
340 s390_aghi (buf, s390_r13, lmfOffset);
342 /*---------------------------------------------------------------*/
343 /* Set lmf.lmf_addr = jit_tls->lmf */
344 /*---------------------------------------------------------------*/
345 s390_stg (buf, s390_r2, 0, s390_r13,
346 G_STRUCT_OFFSET(MonoLMF, lmf_addr));
348 /*---------------------------------------------------------------*/
349 /* Get current lmf */
350 /*---------------------------------------------------------------*/
351 s390_lg (buf, s390_r0, 0, s390_r2, 0);
353 /*---------------------------------------------------------------*/
354 /* Set our lmf as the current lmf */
355 /*---------------------------------------------------------------*/
356 s390_stg (buf, s390_r13, 0, s390_r2, 0);
358 /*---------------------------------------------------------------*/
359 /* Have our lmf.previous_lmf point to the last lmf */
360 /*---------------------------------------------------------------*/
361 s390_stg (buf, s390_r0, 0, s390_r13,
362 G_STRUCT_OFFSET(MonoLMF, previous_lmf));
364 /*---------------------------------------------------------------*/
365 /* save method info */
366 /*---------------------------------------------------------------*/
367 s390_lg (buf, s390_r1, 0, STK_BASE, METHOD_SAVE_OFFSET);
368 s390_stg (buf, s390_r1, 0, s390_r13,
369 G_STRUCT_OFFSET(MonoLMF, method));
371 /*---------------------------------------------------------------*/
372 /* save the current SP */
373 /*---------------------------------------------------------------*/
374 s390_lg (buf, s390_r1, 0, STK_BASE, 0);
375 s390_stg (buf, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, ebp));
377 /*---------------------------------------------------------------*/
378 /* save the current IP */
379 /*---------------------------------------------------------------*/
380 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
381 s390_lghi (buf, s390_r1, 0);
383 s390_lg (buf, s390_r1, 0, s390_r1, S390_RET_ADDR_OFFSET);
384 // s390_la (buf, s390_r1, 0, s390_r1, 0);
386 s390_stg (buf, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, eip));
388 /*---------------------------------------------------------------*/
389 /* Save general and floating point registers */
390 /*---------------------------------------------------------------*/
391 s390_stmg (buf, s390_r2, s390_r12, s390_r13,
392 G_STRUCT_OFFSET(MonoLMF, gregs[2]));
393 for (i = 0; i < 16; i++) {
394 s390_std (buf, i, 0, s390_r13,
395 G_STRUCT_OFFSET(MonoLMF, fregs[i]));
398 /*---------------------------------------------------------------*/
399 /* STEP 2: call the C trampoline function */
400 /*---------------------------------------------------------------*/
404 /* Arg 1: mgreg_t *regs. We pass sp instead */
405 s390_lgr (buf, s390_r2, STK_BASE);
406 s390_ahi (buf, s390_r2, CREATE_STACK_SIZE);
408 /* Arg 2: code (next address to the instruction that called us) */
409 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
410 s390_lghi (buf, s390_r3, 0);
412 s390_lg (buf, s390_r3, 0, s390_r11, S390_RET_ADDR_OFFSET);
415 /* Arg 3: MonoMethod *method. It was put in r1 by the
416 method-specific trampoline code, and then saved before the call
417 to mono_get_lmf_addr()'. */
418 s390_lg (buf, s390_r4, 0, STK_BASE, METHOD_SAVE_OFFSET);
420 /* Arg 4: trampoline address. Ignore for now */
422 /* Calculate call address and call the C trampoline. Return value will be in r2 */
423 s390_basr (buf, s390_r13, 0);
425 tramp = (guint8*)mono_get_trampoline_func (tramp_type);
426 s390_llong (buf, tramp);
427 s390_lg (buf, s390_r1, 0, s390_r13, 4);
428 s390_basr (buf, s390_r14, s390_r1);
430 /* OK, code address is now on r2. Move it to r1, so that we
431 can restore r2 and use it from r1 later */
432 s390_lgr (buf, s390_r1, s390_r2);
434 /*----------------------------------------------------------
435 STEP 3: Restore the LMF
436 ----------------------------------------------------------*/
437 restoreLMF(buf, STK_BASE, CREATE_STACK_SIZE);
439 /*----------------------------------------------------------
440 STEP 4: call the compiled method
441 ----------------------------------------------------------*/
443 /* Restore registers */
445 s390_lmg (buf, s390_r2, s390_r5, STK_BASE, CREATE_GR_OFFSET);
447 /* Restore the FP registers */
448 offset = CREATE_FP_OFFSET;
449 for (i = s390_f0; i <= s390_f15; ++i) {
450 s390_ld (buf, i, 0, STK_BASE, offset);
454 /* Restore stack pointer and jump to the code -
455 R14 contains the return address to our caller */
456 s390_lgr (buf, STK_BASE, s390_r11);
457 s390_lmg (buf, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
459 if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT || tramp_type == MONO_TRAMPOLINE_GENERIC_CLASS_INIT)
460 s390_br (buf, s390_r14);
462 s390_br (buf, s390_r1);
464 /* Flush instruction cache, since we've generated code */
465 mono_arch_flush_icache (code, buf - code);
468 g_assert ((buf - code) <= 512);
473 /*========================= End of Function ========================*/
475 /*------------------------------------------------------------------*/
477 /* Name - mono_arch_create_specific_trampoline */
479 /* Function - Creates the given kind of specific trampoline */
481 /*------------------------------------------------------------------*/
484 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
486 guint8 *code, *buf, *tramp;
489 tramp = mono_get_trampoline_code (tramp_type);
491 /*----------------------------------------------------------*/
492 /* This is the method-specific part of the trampoline. Its */
493 /* purpose is to provide the generic part with the */
494 /* MonoMethod *method pointer. We'll use r1 to keep it. */
495 /*----------------------------------------------------------*/
496 code = buf = mono_domain_code_reserve (domain, SPECIFIC_TRAMPOLINE_SIZE);
498 s390_basr (buf, s390_r1, 0);
500 s390_llong(buf, arg1);
501 s390_lg (buf, s390_r1, 0, s390_r1, 4);
502 displace = (tramp - buf) / 2;
503 s390_jcl (buf, S390_CC_UN, displace);
505 /* Flush instruction cache, since we've generated code */
506 mono_arch_flush_icache (code, buf - code);
509 g_assert ((buf - code) <= SPECIFIC_TRAMPOLINE_SIZE);
512 *code_len = buf - code;
517 /*========================= End of Function ========================*/
520 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 encoded_offset)
522 /* FIXME: implement! */
523 g_assert_not_reached ();