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 - 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_r13, 0);
108 s390_word (code, addr);
109 s390_l (code, s390_r1, 0, s390_r13, 4);
110 s390_ahi (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 /* This should be a 'brasl' instruction */
138 g_assert (opcode == 0xc0e5);
140 displace = ((gint32) addr - (gint32) (orig_code - 2)) / 2;
141 s390_patch (orig_code, displace);
142 mono_arch_flush_icache (orig_code, 4);
145 /*========================= End of Function ========================*/
148 mono_arch_patch_plt_entry (guint8 *code, guint8 *addr)
150 g_assert_not_reached ();
153 /*========================= End of Function ========================*/
155 /*------------------------------------------------------------------*/
157 /* Name - mono_arch_nullify_class_init_trampoline */
159 /* Function - Nullify a call which calls a class init trampoline */
161 /*------------------------------------------------------------------*/
164 mono_arch_nullify_class_init_trampoline (guint8 *code, gssize *regs)
166 char patch[6] = {0x47, 0x00, 0x00, 0x00, 0x07, 0x00};
170 memcpy(code, patch, sizeof(patch));
173 /*========================= End of Function ========================*/
176 mono_arch_nullify_plt_entry (guint8 *code)
178 g_assert_not_reached ();
181 /*========================= End of Function ========================*/
183 /*------------------------------------------------------------------*/
185 /* Name - mono_arch_get_vcall_slot */
187 /* Function - This method is called by the arch independent */
188 /* trampoline code to determine the vtable slot used by */
189 /* the call which invoked the trampoline. */
191 /* generated by mono for S/390 will look like either:*/
192 /* 1. l %r1,xxx(%rx) */
194 /* 2. brasl %r14,xxxxxx */
196 /* Parameters - code - Pointer into caller code */
197 /* regs - Register state at the point of the call */
198 /* displacement - Out parameter which will receive */
199 /* the displacement of the vtable slot */
201 /*------------------------------------------------------------------*/
204 mono_arch_get_vcall_slot (guint8 *code, gpointer *regs, int *displacement)
208 unsigned short opcode;
211 // We are passed sp instead of the register array
216 opcode = *((unsigned short *) (code - 6));
219 /* This is a bras r14,r1 instruction */
222 *displacement = *((short *)code) & 0x0fff;
224 base = *((guchar **) (sp + S390_REG_SAVE_OFFSET+
225 sizeof(int)*(reg-6)));
227 base = *((guchar **) ((sp - CREATE_STACK_SIZE) +
229 sizeof(int)*(reg-2)));
232 /* l %r1,OFFSET(%r13,%r7) */
235 *displacement = *((short *)code) & 0x0fff;
237 base = *((guchar **) (sp + S390_REG_SAVE_OFFSET+
238 sizeof(int)*(reg-6)));
240 base = *((guchar **) ((sp - CREATE_STACK_SIZE) +
242 sizeof(int)*(reg-2)));
243 base += *((guint32*) (sp + S390_REG_SAVE_OFFSET+
244 sizeof(int)*(s390_r13-6)));
247 /* This is the 'brasl' instruction */
250 g_error("Unable to patch instruction prior to %p",code);
256 /*========================= End of Function ========================*/
259 mono_arch_get_vcall_slot_addr (guint8* code, gpointer *regs)
263 vt = mono_arch_get_vcall_slot (code, regs, &displacement);
266 return (gpointer*)((char*)vt + displacement);
269 /*========================= End of Function ========================*/
271 /*------------------------------------------------------------------*/
273 /* Name - mono_arch_create_trampoline_code */
275 /* Function - Create the designated type of trampoline according*/
276 /* to the 'tramp_type' parameter. */
278 /*------------------------------------------------------------------*/
281 mono_arch_create_trampoline_code (MonoTrampolineType tramp_type)
284 guint8 *buf, *tramp, *code;
285 int i, offset, lmfOffset;
287 /* Now we'll create in 'buf' the S/390 trampoline code. This
288 is the trampoline code common to all methods */
290 code = buf = mono_global_codeman_reserve (512);
292 /*-----------------------------------------------------------
293 STEP 0: First create a non-standard function prologue with a
294 stack size big enough to save our registers.
295 -----------------------------------------------------------*/
297 s390_stm (buf, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
298 s390_lr (buf, s390_r11, s390_r15);
299 s390_ahi (buf, STK_BASE, -CREATE_STACK_SIZE);
300 s390_st (buf, s390_r11, 0, STK_BASE, 0);
301 s390_st (buf, s390_r1, 0, STK_BASE, METHOD_SAVE_OFFSET);
302 s390_stm (buf, s390_r2, s390_r5, STK_BASE, CREATE_GR_OFFSET);
304 /* Save the FP registers */
305 offset = CREATE_FP_OFFSET;
306 for (i = s390_f0; i <= s390_f15; ++i) {
307 s390_std (buf, i, 0, STK_BASE, offset);
311 /*----------------------------------------------------------
312 STEP 1: call 'mono_get_lmf_addr()' to get the address of our
313 LMF. We'll need to restore it after the call to
314 's390_magic_trampoline' and before the call to the native
316 ----------------------------------------------------------*/
318 s390_basr (buf, s390_r13, 0);
320 s390_word (buf, mono_get_lmf_addr);
321 s390_l (buf, s390_r1, 0, s390_r13, 4);
322 s390_basr (buf, s390_r14, s390_r1);
324 /*---------------------------------------------------------------*/
325 /* we build the MonoLMF structure on the stack - see mini-s390.h */
326 /* Keep in sync with the code in mono_arch_emit_prolog */
327 /*---------------------------------------------------------------*/
328 lmfOffset = CREATE_STACK_SIZE - sizeof(MonoLMF);
330 s390_lr (buf, s390_r13, STK_BASE);
331 s390_ahi (buf, s390_r13, lmfOffset);
333 /*---------------------------------------------------------------*/
334 /* Set lmf.lmf_addr = jit_tls->lmf */
335 /*---------------------------------------------------------------*/
336 s390_st (buf, s390_r2, 0, s390_r13,
337 G_STRUCT_OFFSET(MonoLMF, lmf_addr));
339 /*---------------------------------------------------------------*/
340 /* Get current lmf */
341 /*---------------------------------------------------------------*/
342 s390_l (buf, s390_r0, 0, s390_r2, 0);
344 /*---------------------------------------------------------------*/
345 /* Set our lmf as the current lmf */
346 /*---------------------------------------------------------------*/
347 s390_st (buf, s390_r13, 0, s390_r2, 0);
349 /*---------------------------------------------------------------*/
350 /* Have our lmf.previous_lmf point to the last lmf */
351 /*---------------------------------------------------------------*/
352 s390_st (buf, s390_r0, 0, s390_r13,
353 G_STRUCT_OFFSET(MonoLMF, previous_lmf));
355 /*---------------------------------------------------------------*/
356 /* save method info */
357 /*---------------------------------------------------------------*/
358 s390_l (buf, s390_r1, 0, STK_BASE, METHOD_SAVE_OFFSET);
359 s390_st (buf, s390_r1, 0, s390_r13,
360 G_STRUCT_OFFSET(MonoLMF, method));
362 /*---------------------------------------------------------------*/
363 /* save the current SP */
364 /*---------------------------------------------------------------*/
365 s390_l (buf, s390_r1, 0, STK_BASE, 0);
366 s390_st (buf, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, ebp));
368 /*---------------------------------------------------------------*/
369 /* save the current IP */
370 /*---------------------------------------------------------------*/
371 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
372 s390_lhi (buf, s390_r1, 0);
374 s390_l (buf, s390_r1, 0, s390_r1, S390_RET_ADDR_OFFSET);
375 s390_la (buf, s390_r1, 0, s390_r1, 0);
377 s390_st (buf, s390_r1, 0, s390_r13, G_STRUCT_OFFSET(MonoLMF, eip));
379 /*---------------------------------------------------------------*/
380 /* Save general and floating point registers */
381 /*---------------------------------------------------------------*/
382 s390_stm (buf, s390_r2, s390_r12, s390_r13,
383 G_STRUCT_OFFSET(MonoLMF, gregs[2]));
384 for (i = 0; i < 16; i++) {
385 s390_std (buf, i, 0, s390_r13,
386 G_STRUCT_OFFSET(MonoLMF, fregs[i]));
389 /*---------------------------------------------------------------*/
390 /* STEP 2: call the C trampoline function */
391 /*---------------------------------------------------------------*/
395 /* Arg 1: gssize *regs. We pass sp instead */
396 s390_lr (buf, s390_r2, STK_BASE);
397 s390_ahi (buf, s390_r2, CREATE_STACK_SIZE);
399 /* Arg 2: code (next address to the instruction that called us) */
400 if (tramp_type == MONO_TRAMPOLINE_JUMP) {
401 s390_lhi (buf, s390_r3, 0);
403 s390_l (buf, s390_r3, 0, s390_r11, S390_RET_ADDR_OFFSET);
405 /* Mask out bit 31 */
406 s390_basr (buf, s390_r13, 0);
408 s390_word (buf, (~(1 << 31)));
409 s390_n (buf, s390_r3, 0, s390_r13, 4);
412 /* Arg 3: MonoMethod *method. It was put in r1 by the
413 method-specific trampoline code, and then saved before the call
414 to mono_get_lmf_addr()'. */
415 s390_l (buf, s390_r4, 0, STK_BASE, METHOD_SAVE_OFFSET);
417 /* Arg 4: trampoline address. Ignore for now */
419 /* Calculate call address and call the C trampoline. Return value will be in r2 */
420 s390_basr (buf, s390_r13, 0);
422 tramp = (guint8*)mono_get_trampoline_func (tramp_type);
423 s390_word (buf, tramp);
424 s390_l (buf, s390_r1, 0, s390_r13, 4);
425 s390_basr (buf, s390_r14, s390_r1);
427 /* OK, code address is now on r2. Move it to r1, so that we
428 can restore r2 and use it from r1 later */
429 s390_lr (buf, s390_r1, s390_r2);
431 /*----------------------------------------------------------
432 STEP 3: Restore the LMF
433 ----------------------------------------------------------*/
434 restoreLMF(buf, STK_BASE, CREATE_STACK_SIZE);
436 /*----------------------------------------------------------
437 STEP 4: call the compiled method
438 ----------------------------------------------------------*/
440 /* Restore registers */
442 s390_lm (buf, s390_r2, s390_r5, STK_BASE, CREATE_GR_OFFSET);
444 /* Restore the FP registers */
445 offset = CREATE_FP_OFFSET;
446 for (i = s390_f0; i <= s390_f15; ++i) {
447 s390_ld (buf, i, 0, STK_BASE, offset);
451 /* Restore stack pointer and jump to the code -
452 R14 contains the return address to our caller */
453 s390_lr (buf, STK_BASE, s390_r11);
454 s390_lm (buf, s390_r6, s390_r14, STK_BASE, S390_REG_SAVE_OFFSET);
456 if (tramp_type == MONO_TRAMPOLINE_CLASS_INIT || tramp_type == MONO_TRAMPOLINE_GENERIC_CLASS_INIT)
457 s390_br (buf, s390_r14);
459 s390_br (buf, s390_r1);
461 /* Flush instruction cache, since we've generated code */
462 mono_arch_flush_icache (code, buf - code);
465 g_assert ((buf - code) <= 512);
470 /*========================= End of Function ========================*/
472 /*------------------------------------------------------------------*/
474 /* Name - mono_arch_create_specific_trampoline */
476 /* Function - Creates the given kind of specific trampoline */
478 /*------------------------------------------------------------------*/
481 mono_arch_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
483 guint8 *code, *buf, *tramp;
486 tramp = mono_get_trampoline_code (tramp_type);
488 /*----------------------------------------------------------*/
489 /* This is the method-specific part of the trampoline. Its */
490 /* purpose is to provide the generic part with the */
491 /* MonoMethod *method pointer. We'll use r1 to keep it. */
492 /*----------------------------------------------------------*/
493 mono_domain_lock (domain);
494 code = buf = mono_code_manager_reserve (domain->code_mp, SPECIFIC_TRAMPOLINE_SIZE);
495 mono_domain_unlock (domain);
497 s390_basr (buf, s390_r1, 0);
499 s390_word (buf, arg1);
500 s390_l (buf, s390_r1, 0, s390_r1, 4);
501 displace = (tramp - buf) / 2;
502 s390_jcl (buf, S390_CC_UN, displace);
504 /* Flush instruction cache, since we've generated code */
505 mono_arch_flush_icache (code, buf - code);
508 g_assert ((buf - code) <= SPECIFIC_TRAMPOLINE_SIZE);
511 *code_len = buf - code;
516 /*========================= End of Function ========================*/
519 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 encoded_offset)
521 /* FIXME: implement! */
522 g_assert_not_reached ();
527 mono_arch_get_rgctx_lazy_fetch_offset (gpointer *regs)
529 /* FIXME: implement! */
530 g_assert_not_reached ();