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 start
= code
= mono_domain_code_reserve (domain
, 28);
104 s390_basr (code
, s390_r13
, 0);
106 s390_word (code
, addr
);
107 s390_l (code
, s390_r1
, 0, s390_r13
, 4);
108 s390_ahi (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 /* This should be a 'brasl' instruction */
136 g_assert (opcode
== 0xc0e5);
138 displace
= ((gint32
) addr
- (gint32
) (orig_code
- 2)) / 2;
139 s390_patch (orig_code
, displace
);
140 mono_arch_flush_icache (orig_code
, 4);
143 /*========================= End of Function ========================*/
146 mono_arch_patch_plt_entry (guint8
*code
, gpointer
*got
, mgreg_t
*regs
, guint8
*addr
)
148 g_assert_not_reached ();
151 /*========================= End of Function ========================*/
153 /*------------------------------------------------------------------*/
155 /* Name - mono_arch_nullify_class_init_trampoline */
157 /* Function - Nullify a call which calls a class init trampoline */
159 /*------------------------------------------------------------------*/
162 mono_arch_nullify_class_init_trampoline (guint8
*code
, mgreg_t
*regs
)
164 char patch
[6] = {0x47, 0x00, 0x00, 0x00, 0x07, 0x00};
168 memcpy(code
, patch
, sizeof(patch
));
171 /*========================= End of Function ========================*/
174 mono_arch_nullify_plt_entry (guint8
*code
, mgreg_t
*regs
)
176 g_assert_not_reached ();
179 /*========================= End of Function ========================*/
181 /*------------------------------------------------------------------*/
183 /* Name - mono_arch_get_vcall_slot */
185 /* Function - This method is called by the arch independent */
186 /* trampoline code to determine the vtable slot used by */
187 /* the call which invoked the trampoline. */
189 /* generated by mono for S/390 will look like either:*/
190 /* 1. l %r1,xxx(%rx) */
192 /* 2. brasl %r14,xxxxxx */
194 /* Parameters - code - Pointer into caller code */
195 /* regs - Register state at the point of the call */
196 /* displacement - Out parameter which will receive */
197 /* the displacement of the vtable slot */
199 /*------------------------------------------------------------------*/
202 mono_arch_get_vcall_slot (guint8
*code
, mgreg_t
*regs
, int *displacement
)
206 unsigned short opcode
;
209 // We are passed sp instead of the register array
214 opcode
= *((unsigned short *) (code
- 6));
217 /* This is a bras r14,r1 instruction */
220 *displacement
= *((short *)code
) & 0x0fff;
222 base
= *((guchar
**) (sp
+ S390_REG_SAVE_OFFSET
+
223 sizeof(int)*(reg
-6)));
225 base
= *((guchar
**) ((sp
- CREATE_STACK_SIZE
) +
227 sizeof(int)*(reg
-2)));
230 /* l %r1,OFFSET(%r13,%r7) */
233 *displacement
= *((short *)code
) & 0x0fff;
235 base
= *((guchar
**) (sp
+ S390_REG_SAVE_OFFSET
+
236 sizeof(int)*(reg
-6)));
238 base
= *((guchar
**) ((sp
- CREATE_STACK_SIZE
) +
240 sizeof(int)*(reg
-2)));
241 base
+= *((guint32
*) (sp
+ S390_REG_SAVE_OFFSET
+
242 sizeof(int)*(s390_r13
-6)));
245 /* This is the 'brasl' instruction */
248 g_error("Unable to patch instruction prior to %p",code
);
254 /*========================= End of Function ========================*/
256 /*------------------------------------------------------------------*/
258 /* Name - mono_arch_create_trampoline_code */
260 /* Function - Create the designated type of trampoline according*/
261 /* to the 'tramp_type' parameter. */
263 /*------------------------------------------------------------------*/
266 mono_arch_create_trampoline_code (MonoTrampolineType tramp_type
)
269 guint8
*buf
, *tramp
, *code
;
270 int i
, offset
, lmfOffset
;
272 /* Now we'll create in 'buf' the S/390 trampoline code. This
273 is the trampoline code common to all methods */
275 code
= buf
= mono_global_codeman_reserve (512);
277 /*-----------------------------------------------------------
278 STEP 0: First create a non-standard function prologue with a
279 stack size big enough to save our registers.
280 -----------------------------------------------------------*/
282 s390_stm (buf
, s390_r6
, s390_r14
, STK_BASE
, S390_REG_SAVE_OFFSET
);
283 s390_lr (buf
, s390_r11
, s390_r15
);
284 s390_ahi (buf
, STK_BASE
, -CREATE_STACK_SIZE
);
285 s390_st (buf
, s390_r11
, 0, STK_BASE
, 0);
286 s390_st (buf
, s390_r1
, 0, STK_BASE
, METHOD_SAVE_OFFSET
);
287 s390_stm (buf
, s390_r2
, s390_r5
, STK_BASE
, CREATE_GR_OFFSET
);
289 /* Save the FP registers */
290 offset
= CREATE_FP_OFFSET
;
291 for (i
= s390_f0
; i
<= s390_f15
; ++i
) {
292 s390_std (buf
, i
, 0, STK_BASE
, offset
);
296 /*----------------------------------------------------------
297 STEP 1: call 'mono_get_lmf_addr()' to get the address of our
298 LMF. We'll need to restore it after the call to
299 's390_magic_trampoline' and before the call to the native
301 ----------------------------------------------------------*/
303 s390_basr (buf
, s390_r13
, 0);
305 s390_word (buf
, mono_get_lmf_addr
);
306 s390_l (buf
, s390_r1
, 0, s390_r13
, 4);
307 s390_basr (buf
, s390_r14
, s390_r1
);
309 /*---------------------------------------------------------------*/
310 /* we build the MonoLMF structure on the stack - see mini-s390.h */
311 /* Keep in sync with the code in mono_arch_emit_prolog */
312 /*---------------------------------------------------------------*/
313 lmfOffset
= CREATE_STACK_SIZE
- sizeof(MonoLMF
);
315 s390_lr (buf
, s390_r13
, STK_BASE
);
316 s390_ahi (buf
, s390_r13
, lmfOffset
);
318 /*---------------------------------------------------------------*/
319 /* Set lmf.lmf_addr = jit_tls->lmf */
320 /*---------------------------------------------------------------*/
321 s390_st (buf
, s390_r2
, 0, s390_r13
,
322 G_STRUCT_OFFSET(MonoLMF
, lmf_addr
));
324 /*---------------------------------------------------------------*/
325 /* Get current lmf */
326 /*---------------------------------------------------------------*/
327 s390_l (buf
, s390_r0
, 0, s390_r2
, 0);
329 /*---------------------------------------------------------------*/
330 /* Set our lmf as the current lmf */
331 /*---------------------------------------------------------------*/
332 s390_st (buf
, s390_r13
, 0, s390_r2
, 0);
334 /*---------------------------------------------------------------*/
335 /* Have our lmf.previous_lmf point to the last lmf */
336 /*---------------------------------------------------------------*/
337 s390_st (buf
, s390_r0
, 0, s390_r13
,
338 G_STRUCT_OFFSET(MonoLMF
, previous_lmf
));
340 /*---------------------------------------------------------------*/
341 /* save method info */
342 /*---------------------------------------------------------------*/
343 s390_l (buf
, s390_r1
, 0, STK_BASE
, METHOD_SAVE_OFFSET
);
344 s390_st (buf
, s390_r1
, 0, s390_r13
,
345 G_STRUCT_OFFSET(MonoLMF
, method
));
347 /*---------------------------------------------------------------*/
348 /* save the current SP */
349 /*---------------------------------------------------------------*/
350 s390_l (buf
, s390_r1
, 0, STK_BASE
, 0);
351 s390_st (buf
, s390_r1
, 0, s390_r13
, G_STRUCT_OFFSET(MonoLMF
, ebp
));
353 /*---------------------------------------------------------------*/
354 /* save the current IP */
355 /*---------------------------------------------------------------*/
356 if (tramp_type
== MONO_TRAMPOLINE_JUMP
) {
357 s390_lhi (buf
, s390_r1
, 0);
359 s390_l (buf
, s390_r1
, 0, s390_r1
, S390_RET_ADDR_OFFSET
);
360 s390_la (buf
, s390_r1
, 0, s390_r1
, 0);
362 s390_st (buf
, s390_r1
, 0, s390_r13
, G_STRUCT_OFFSET(MonoLMF
, eip
));
364 /*---------------------------------------------------------------*/
365 /* Save general and floating point registers */
366 /*---------------------------------------------------------------*/
367 s390_stm (buf
, s390_r2
, s390_r12
, s390_r13
,
368 G_STRUCT_OFFSET(MonoLMF
, gregs
[2]));
369 for (i
= 0; i
< 16; i
++) {
370 s390_std (buf
, i
, 0, s390_r13
,
371 G_STRUCT_OFFSET(MonoLMF
, fregs
[i
]));
374 /*---------------------------------------------------------------*/
375 /* STEP 2: call the C trampoline function */
376 /*---------------------------------------------------------------*/
380 /* Arg 1: mgreg_t *regs. We pass sp instead */
381 s390_lr (buf
, s390_r2
, STK_BASE
);
382 s390_ahi (buf
, s390_r2
, CREATE_STACK_SIZE
);
384 /* Arg 2: code (next address to the instruction that called us) */
385 if (tramp_type
== MONO_TRAMPOLINE_JUMP
) {
386 s390_lhi (buf
, s390_r3
, 0);
388 s390_l (buf
, s390_r3
, 0, s390_r11
, S390_RET_ADDR_OFFSET
);
390 /* Mask out bit 31 */
391 s390_basr (buf
, s390_r13
, 0);
393 s390_word (buf
, (~(1 << 31)));
394 s390_n (buf
, s390_r3
, 0, s390_r13
, 4);
397 /* Arg 3: MonoMethod *method. It was put in r1 by the
398 method-specific trampoline code, and then saved before the call
399 to mono_get_lmf_addr()'. */
400 s390_l (buf
, s390_r4
, 0, STK_BASE
, METHOD_SAVE_OFFSET
);
402 /* Arg 4: trampoline address. Ignore for now */
404 /* Calculate call address and call the C trampoline. Return value will be in r2 */
405 s390_basr (buf
, s390_r13
, 0);
407 tramp
= (guint8
*)mono_get_trampoline_func (tramp_type
);
408 s390_word (buf
, tramp
);
409 s390_l (buf
, s390_r1
, 0, s390_r13
, 4);
410 s390_basr (buf
, s390_r14
, s390_r1
);
412 /* OK, code address is now on r2. Move it to r1, so that we
413 can restore r2 and use it from r1 later */
414 s390_lr (buf
, s390_r1
, s390_r2
);
416 /*----------------------------------------------------------
417 STEP 3: Restore the LMF
418 ----------------------------------------------------------*/
419 restoreLMF(buf
, STK_BASE
, CREATE_STACK_SIZE
);
421 /*----------------------------------------------------------
422 STEP 4: call the compiled method
423 ----------------------------------------------------------*/
425 /* Restore registers */
427 s390_lm (buf
, s390_r2
, s390_r5
, STK_BASE
, CREATE_GR_OFFSET
);
429 /* Restore the FP registers */
430 offset
= CREATE_FP_OFFSET
;
431 for (i
= s390_f0
; i
<= s390_f15
; ++i
) {
432 s390_ld (buf
, i
, 0, STK_BASE
, offset
);
436 /* Restore stack pointer and jump to the code -
437 R14 contains the return address to our caller */
438 s390_lr (buf
, STK_BASE
, s390_r11
);
439 s390_lm (buf
, s390_r6
, s390_r14
, STK_BASE
, S390_REG_SAVE_OFFSET
);
441 if (tramp_type
== MONO_TRAMPOLINE_CLASS_INIT
|| tramp_type
== MONO_TRAMPOLINE_GENERIC_CLASS_INIT
)
442 s390_br (buf
, s390_r14
);
444 s390_br (buf
, s390_r1
);
446 /* Flush instruction cache, since we've generated code */
447 mono_arch_flush_icache (code
, buf
- code
);
450 g_assert ((buf
- code
) <= 512);
455 /*========================= End of Function ========================*/
457 /*------------------------------------------------------------------*/
459 /* Name - mono_arch_create_specific_trampoline */
461 /* Function - Creates the given kind of specific trampoline */
463 /*------------------------------------------------------------------*/
466 mono_arch_create_specific_trampoline (gpointer arg1
, MonoTrampolineType tramp_type
, MonoDomain
*domain
, guint32
*code_len
)
468 guint8
*code
, *buf
, *tramp
;
471 tramp
= mono_get_trampoline_code (tramp_type
);
473 /*----------------------------------------------------------*/
474 /* This is the method-specific part of the trampoline. Its */
475 /* purpose is to provide the generic part with the */
476 /* MonoMethod *method pointer. We'll use r1 to keep it. */
477 /*----------------------------------------------------------*/
478 code
= buf
= mono_domain_code_reserve (domain
, SPECIFIC_TRAMPOLINE_SIZE
);
480 s390_basr (buf
, s390_r1
, 0);
482 s390_word (buf
, arg1
);
483 s390_l (buf
, s390_r1
, 0, s390_r1
, 4);
484 displace
= (tramp
- buf
) / 2;
485 s390_jcl (buf
, S390_CC_UN
, displace
);
487 /* Flush instruction cache, since we've generated code */
488 mono_arch_flush_icache (code
, buf
- code
);
491 g_assert ((buf
- code
) <= SPECIFIC_TRAMPOLINE_SIZE
);
494 *code_len
= buf
- code
;
499 /*========================= End of Function ========================*/
502 mono_arch_create_rgctx_lazy_fetch_trampoline (guint32 encoded_offset
)
504 /* FIXME: implement! */
505 g_assert_not_reached ();