summaryrefslogtreecommitdiff
path: root/libffi/src/arm/sysv.S
blob: 72f0ee0ca0cdba2d8d640f64bcfe736c05204f39 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
/* -----------------------------------------------------------------------
   sysv.S - Copyright (c) 1998, 2008 Red Hat, Inc.
   
   ARM Foreign Function Interface 

   Permission is hereby granted, free of charge, to any person obtaining
   a copy of this software and associated documentation files (the
   ``Software''), to deal in the Software without restriction, including
   without limitation the rights to use, copy, modify, merge, publish,
   distribute, sublicense, and/or sell copies of the Software, and to
   permit persons to whom the Software is furnished to do so, subject to
   the following conditions:

   The above copyright notice and this permission notice shall be included
   in all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   DEALINGS IN THE SOFTWARE.
   ----------------------------------------------------------------------- */

#define LIBFFI_ASM	
#include <fficonfig.h>
#include <ffi.h>
#ifdef HAVE_MACHINE_ASM_H
#include <machine/asm.h>
#else
#ifdef __USER_LABEL_PREFIX__
#define CONCAT1(a, b) CONCAT2(a, b)
#define CONCAT2(a, b) a ## b

/* Use the right prefix for global labels.  */
#define CNAME(x) CONCAT1 (__USER_LABEL_PREFIX__, x)
#else
#define CNAME(x) x
#endif
#define ENTRY(x) .globl CNAME(x); .type CNAME(x),%function; CNAME(x):
#endif

#ifdef __ELF__
#define LSYM(x) .x
#else
#define LSYM(x) x
#endif

/* We need a better way of testing for this, but for now, this is all 
   we can do.  */
@ This selects the minimum architecture level required.
#define __ARM_ARCH__ 3

#if defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__)
# undef __ARM_ARCH__
# define __ARM_ARCH__ 4
#endif
        
#if defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) \
	|| defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) \
	|| defined(__ARM_ARCH_5TEJ__)
# undef __ARM_ARCH__
# define __ARM_ARCH__ 5
#endif

#if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
        || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) \
        || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) \
	|| defined(__ARM_ARCH_6M__)
# undef __ARM_ARCH__
# define __ARM_ARCH__ 6
#endif

#if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \
        || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) \
	|| defined(__ARM_ARCH_7EM__)
# undef __ARM_ARCH__
# define __ARM_ARCH__ 7
#endif

#if __ARM_ARCH__ >= 5
# define call_reg(x)	blx	x
#elif defined (__ARM_ARCH_4T__)
# define call_reg(x)	mov	lr, pc ; bx	x
# if defined(__thumb__) || defined(__THUMB_INTERWORK__)
#  define __INTERWORKING__
# endif
#else
# define call_reg(x)	mov	lr, pc ; mov	pc, x
#endif

/* Conditionally compile unwinder directives.  */
#ifdef __ARM_EABI__
#define UNWIND
#else
#define UNWIND @
#endif	

	
#if defined(__thumb__) && !defined(__THUMB_INTERWORK__)
.macro	ARM_FUNC_START name
	.text
	.align 0
	.thumb
	.thumb_func
	ENTRY(\name)
	bx	pc
	nop
	.arm
	UNWIND .fnstart
/* A hook to tell gdb that we've switched to ARM mode.  Also used to call
   directly from other local arm routines.  */
_L__\name:		
.endm
#else
.macro	ARM_FUNC_START name
	.text
	.align 0
	.arm
	ENTRY(\name)
	UNWIND .fnstart
.endm
#endif

.macro	RETLDM	regs=, cond=, dirn=ia
#if defined (__INTERWORKING__)
	.ifc "\regs",""
	ldr\cond	lr, [sp], #4
	.else
	ldm\cond\dirn	sp!, {\regs, lr}
	.endif
	bx\cond	lr
#else
	.ifc "\regs",""
	ldr\cond	pc, [sp], #4
	.else
	ldm\cond\dirn	sp!, {\regs, pc}
	.endif
#endif
.endm


	@ r0:   fn
	@ r1:   &ecif
	@ r2:   cif->bytes
	@ r3:   fig->flags
	@ sp+0: ecif.rvalue

	@ This assumes we are using gas.
ARM_FUNC_START ffi_call_SYSV
	@ Save registers
        stmfd	sp!, {r0-r3, fp, lr}
	UNWIND .save	{r0-r3, fp, lr}
	mov	fp, sp

	UNWIND .setfp	fp, sp

	@ Make room for all of the new args.
	sub	sp, fp, r2

	@ Place all of the ffi_prep_args in position
	mov	r0, sp
	@     r1 already set

	@ Call ffi_prep_args(stack, &ecif)
	bl	ffi_prep_args

	@ move first 4 parameters in registers
	ldmia	sp, {r0-r3}

	@ and adjust stack
	sub	lr, fp, sp	@ cif->bytes == fp - sp
	ldr	ip, [fp]	@ load fn() in advance
	cmp	lr, #16
	movhs	lr, #16
	add	sp, sp, lr

	@ call (fn) (...)
	call_reg(ip)
	
	@ Remove the space we pushed for the args
	mov	sp, fp

	@ Load r2 with the pointer to storage for the return value
	ldr	r2, [sp, #24]

	@ Load r3 with the return type code 
	ldr	r3, [sp, #12]

	@ If the return value pointer is NULL, assume no return value.
	cmp	r2, #0
	beq	LSYM(Lepilogue)

@ return INT
	cmp	r3, #FFI_TYPE_INT
#if defined(__SOFTFP__) || defined(__ARM_EABI__)
	cmpne	r3, #FFI_TYPE_FLOAT
#endif
	streq	r0, [r2]
	beq	LSYM(Lepilogue)

	@ return INT64
	cmp	r3, #FFI_TYPE_SINT64
#if defined(__SOFTFP__) || defined(__ARM_EABI__)
	cmpne	r3, #FFI_TYPE_DOUBLE
#endif
	stmeqia	r2, {r0, r1}

#if !defined(__SOFTFP__) && !defined(__ARM_EABI__)
	beq	LSYM(Lepilogue)

@ return FLOAT
	cmp	r3, #FFI_TYPE_FLOAT
	stfeqs	f0, [r2]
	beq	LSYM(Lepilogue)

@ return DOUBLE or LONGDOUBLE
	cmp	r3, #FFI_TYPE_DOUBLE
	stfeqd	f0, [r2]
#endif

LSYM(Lepilogue):
	RETLDM	"r0-r3,fp"

.ffi_call_SYSV_end:
	UNWIND .fnend
        .size    CNAME(ffi_call_SYSV),.ffi_call_SYSV_end-CNAME(ffi_call_SYSV)


/*
	unsigned int FFI_HIDDEN
	ffi_closure_SYSV_inner (closure, respp, args)
	     ffi_closure *closure;
	     void **respp;
  	     void *args;
*/

ARM_FUNC_START ffi_closure_SYSV
	UNWIND .pad #16
	add	ip, sp, #16
	stmfd	sp!, {ip, lr}
	UNWIND .save	{r0, lr}
	add	r2, sp, #8
	UNWIND .pad #16
	sub	sp, sp, #16
	str	sp, [sp, #8]
	add	r1, sp, #8
	bl	ffi_closure_SYSV_inner
	cmp	r0, #FFI_TYPE_INT
	beq	.Lretint

	cmp	r0, #FFI_TYPE_FLOAT
#if defined(__SOFTFP__) || defined(__ARM_EABI__)
	beq	.Lretint
#else
	beq	.Lretfloat
#endif

	cmp	r0, #FFI_TYPE_DOUBLE
#if defined(__SOFTFP__) || defined(__ARM_EABI__)
	beq	.Lretlonglong
#else
	beq	.Lretdouble
#endif

	cmp	r0, #FFI_TYPE_LONGDOUBLE
#if defined(__SOFTFP__) || defined(__ARM_EABI__)
	beq	.Lretlonglong
#else
	beq	.Lretlongdouble
#endif

	cmp	r0, #FFI_TYPE_SINT64
	beq	.Lretlonglong
.Lclosure_epilogue:
	add	sp, sp, #16
	ldmfd	sp, {sp, pc}
.Lretint:
	ldr	r0, [sp]
	b	.Lclosure_epilogue
.Lretlonglong:
	ldr	r0, [sp]
	ldr	r1, [sp, #4]
	b	.Lclosure_epilogue

#if !defined(__SOFTFP__) && !defined(__ARM_EABI__)
.Lretfloat:
	ldfs	f0, [sp]
	b	.Lclosure_epilogue
.Lretdouble:
	ldfd	f0, [sp]
	b	.Lclosure_epilogue
.Lretlongdouble:
	ldfd	f0, [sp]
	b	.Lclosure_epilogue
#endif

.ffi_closure_SYSV_end:
	UNWIND .fnend
        .size    CNAME(ffi_closure_SYSV),.ffi_closure_SYSV_end-CNAME(ffi_closure_SYSV)


/* Below are VFP hard-float ABI call and closure implementations.
   Add VFP FPU directive here. */
	.fpu	vfp

	@ r0:   fn
	@ r1:   &ecif
	@ r2:   cif->bytes
	@ r3:   fig->flags
	@ sp+0: ecif.rvalue

ARM_FUNC_START ffi_call_VFP
	@ Save registers
        stmfd	sp!, {r0-r3, fp, lr}
	UNWIND .save	{r0-r3, fp, lr}
	mov	fp, sp
	UNWIND .setfp	fp, sp

	@ Make room for all of the new args.
	sub	sp, sp, r2

	@ Make room for loading VFP args
	sub	sp, sp, #64

	@ Place all of the ffi_prep_args in position
	mov	r0, sp
	@     r1 already set
	sub	r2, fp, #64   @ VFP scratch space

	@ Call ffi_prep_args(stack, &ecif, vfp_space)
	bl	ffi_prep_args

	@ Load VFP register args if needed
	cmp	r0, #0
	beq	LSYM(Lbase_args)

	@ Load only d0 if possible
	cmp	r0, #3
	sub	ip, fp, #64
	flddle	d0, [ip]
	fldmiadgt	ip, {d0-d7}

LSYM(Lbase_args):
	@ move first 4 parameters in registers
	ldmia	sp, {r0-r3}

	@ and adjust stack
	sub	lr, ip, sp	@ cif->bytes == (fp - 64) - sp
	ldr	ip, [fp]	@ load fn() in advance
        cmp	lr, #16
	movhs	lr, #16
        add	sp, sp, lr

	@ call (fn) (...)
	call_reg(ip)

	@ Remove the space we pushed for the args
	mov	sp, fp

	@ Load r2 with the pointer to storage for
	@ the return value
	ldr	r2, [sp, #24]

	@ Load r3 with the return type code 
	ldr	r3, [sp, #12]

	@ If the return value pointer is NULL,
	@ assume no return value.
	cmp	r2, #0
	beq	LSYM(Lepilogue_vfp)
	
	cmp	r3, #FFI_TYPE_INT
	streq	r0, [r2]
	beq	LSYM(Lepilogue_vfp)

	cmp	r3, #FFI_TYPE_SINT64
	stmeqia	r2, {r0, r1}
	beq	LSYM(Lepilogue_vfp)

	cmp	r3, #FFI_TYPE_FLOAT
	fstseq	s0, [r2]
	beq	LSYM(Lepilogue_vfp)
	
	cmp	r3, #FFI_TYPE_DOUBLE
	fstdeq	d0, [r2]
	beq	LSYM(Lepilogue_vfp)

	cmp	r3, #FFI_TYPE_STRUCT_VFP_FLOAT
	cmpne	r3, #FFI_TYPE_STRUCT_VFP_DOUBLE
	fstmiadeq	r2, {d0-d3}

LSYM(Lepilogue_vfp):
	RETLDM	"r0-r3,fp"

.ffi_call_VFP_end:
	UNWIND .fnend
        .size    CNAME(ffi_call_VFP),.ffi_call_VFP_end-CNAME(ffi_call_VFP)


ARM_FUNC_START ffi_closure_VFP
	fstmfdd	sp!, {d0-d7}
	@ r0-r3, then d0-d7
	UNWIND .pad #80
	add	ip, sp, #80
	stmfd	sp!, {ip, lr}
	UNWIND .save	{r0, lr}
	add	r2, sp, #72
	add	r3, sp, #8
	UNWIND .pad #72
	sub	sp, sp, #72
	str	sp, [sp, #64]
	add	r1, sp, #64
	bl	ffi_closure_SYSV_inner

	cmp	r0, #FFI_TYPE_INT
	beq	.Lretint_vfp

	cmp	r0, #FFI_TYPE_FLOAT
	beq	.Lretfloat_vfp

	cmp	r0, #FFI_TYPE_DOUBLE
	cmpne	r0, #FFI_TYPE_LONGDOUBLE
	beq	.Lretdouble_vfp

	cmp	r0, #FFI_TYPE_SINT64
	beq	.Lretlonglong_vfp

	cmp	r0, #FFI_TYPE_STRUCT_VFP_FLOAT
	beq	.Lretfloat_struct_vfp

	cmp	r0, #FFI_TYPE_STRUCT_VFP_DOUBLE
	beq	.Lretdouble_struct_vfp
	
.Lclosure_epilogue_vfp:
	add	sp, sp, #72
	ldmfd	sp, {sp, pc}

.Lretfloat_vfp:
	flds	s0, [sp]
	b	.Lclosure_epilogue_vfp
.Lretdouble_vfp:
	fldd	d0, [sp]
	b	.Lclosure_epilogue_vfp
.Lretint_vfp:
	ldr	r0, [sp]
	b	.Lclosure_epilogue_vfp
.Lretlonglong_vfp:
	ldmia	sp, {r0, r1}
	b	.Lclosure_epilogue_vfp
.Lretfloat_struct_vfp:
	fldmiad	sp, {d0-d1}
	b	.Lclosure_epilogue_vfp
.Lretdouble_struct_vfp:
	fldmiad	sp, {d0-d3}
	b	.Lclosure_epilogue_vfp

.ffi_closure_VFP_end:
	UNWIND .fnend
        .size    CNAME(ffi_closure_VFP),.ffi_closure_VFP_end-CNAME(ffi_closure_VFP)

#if defined __ELF__ && defined __linux__
	.section	.note.GNU-stack,"",%progbits
#endif