1 /* -----------------------------------------------------------------------
2 n32.S - Copyright (c) 1996, 1998, 2005, 2007, 2009, 2010 Red Hat, Inc.
4 MIPS Foreign Function Interface
6 Permission is hereby granted, free of charge, to any person obtaining
7 a copy of this software and associated documentation files (the
8 ``Software''), to deal in the Software without restriction, including
9 without limitation the rights to use, copy, modify, merge, publish,
10 distribute, sublicense, and/or sell copies of the Software, and to
11 permit persons to whom the Software is furnished to do so, subject to
12 the following conditions:
14 The above copyright notice and this permission notice shall be included
15 in all copies or substantial portions of the Software.
17 THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
18 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
21 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
22 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
24 DEALINGS IN THE SOFTWARE.
25 ----------------------------------------------------------------------- */
28 #include <fficonfig.h>
31 /* Only build this code if we are compiling for n32 */
33 #if defined(FFI_MIPS_N32)
41 #define SIZEOF_FRAME ( 8 * FFI_SIZEOF_ARG )
53 .frame $fp, SIZEOF_FRAME, ra
54 .mask 0xc0000000,-FFI_SIZEOF_ARG
58 SUBU $sp, SIZEOF_FRAME # Frame size
60 REG_S $fp, SIZEOF_FRAME - 2*FFI_SIZEOF_ARG($sp) # Save frame pointer
61 REG_S ra, SIZEOF_FRAME - 1*FFI_SIZEOF_ARG($sp) # Save return address
65 move t9, callback # callback function pointer
66 REG_S bytes, 2*FFI_SIZEOF_ARG($fp) # bytes
67 REG_S flags, 3*FFI_SIZEOF_ARG($fp) # flags
68 REG_S raddr, 4*FFI_SIZEOF_ARG($fp) # raddr
69 REG_S fn, 5*FFI_SIZEOF_ARG($fp) # fn
71 # Allocate at least 4 words in the argstack
73 bge bytes, 4 * FFI_SIZEOF_ARG, bigger
74 LI v0, 4 * FFI_SIZEOF_ARG
78 ADDU t4, v0, 2 * FFI_SIZEOF_ARG -1 # make sure it is aligned
79 and v0, t4, -2 * FFI_SIZEOF_ARG # to a proper boundry.
82 SUBU $sp, $sp, v0 # move the stack pointer to reflect the
85 move a0, $sp # 4 * FFI_SIZEOF_ARG
86 ADDU a3, $fp, 3 * FFI_SIZEOF_ARG
91 # Copy the stack pointer to t9
94 # Fix the stack if there are more than 8 64bit slots worth
97 # Load the number of bytes
98 REG_L t6, 2*FFI_SIZEOF_ARG($fp)
100 # Is it bigger than 8 * FFI_SIZEOF_ARG?
101 daddiu t8, t6, -(8 * FFI_SIZEOF_ARG)
108 REG_L t6, 3*FFI_SIZEOF_ARG($fp) # load the flags word into t6.
110 and t4, t6, ((1<<FFI_FLAG_BITS)-1)
112 REG_L a0, 0*FFI_SIZEOF_ARG(t9)
115 bne t4, FFI_TYPE_FLOAT, arg1_doublep
116 l.s $f12, 0*FFI_SIZEOF_ARG(t9)
119 l.d $f12, 0*FFI_SIZEOF_ARG(t9)
122 SRL t4, t6, 1*FFI_FLAG_BITS
123 and t4, ((1<<FFI_FLAG_BITS)-1)
125 REG_L a1, 1*FFI_SIZEOF_ARG(t9)
128 bne t4, FFI_TYPE_FLOAT, arg2_doublep
129 l.s $f13, 1*FFI_SIZEOF_ARG(t9)
132 l.d $f13, 1*FFI_SIZEOF_ARG(t9)
135 SRL t4, t6, 2*FFI_FLAG_BITS
136 and t4, ((1<<FFI_FLAG_BITS)-1)
138 REG_L a2, 2*FFI_SIZEOF_ARG(t9)
141 bne t4, FFI_TYPE_FLOAT, arg3_doublep
142 l.s $f14, 2*FFI_SIZEOF_ARG(t9)
145 l.d $f14, 2*FFI_SIZEOF_ARG(t9)
148 SRL t4, t6, 3*FFI_FLAG_BITS
149 and t4, ((1<<FFI_FLAG_BITS)-1)
151 REG_L a3, 3*FFI_SIZEOF_ARG(t9)
154 bne t4, FFI_TYPE_FLOAT, arg4_doublep
155 l.s $f15, 3*FFI_SIZEOF_ARG(t9)
158 l.d $f15, 3*FFI_SIZEOF_ARG(t9)
161 SRL t4, t6, 4*FFI_FLAG_BITS
162 and t4, ((1<<FFI_FLAG_BITS)-1)
164 REG_L a4, 4*FFI_SIZEOF_ARG(t9)
167 bne t4, FFI_TYPE_FLOAT, arg5_doublep
168 l.s $f16, 4*FFI_SIZEOF_ARG(t9)
171 l.d $f16, 4*FFI_SIZEOF_ARG(t9)
174 SRL t4, t6, 5*FFI_FLAG_BITS
175 and t4, ((1<<FFI_FLAG_BITS)-1)
177 REG_L a5, 5*FFI_SIZEOF_ARG(t9)
180 bne t4, FFI_TYPE_FLOAT, arg6_doublep
181 l.s $f17, 5*FFI_SIZEOF_ARG(t9)
184 l.d $f17, 5*FFI_SIZEOF_ARG(t9)
187 SRL t4, t6, 6*FFI_FLAG_BITS
188 and t4, ((1<<FFI_FLAG_BITS)-1)
190 REG_L a6, 6*FFI_SIZEOF_ARG(t9)
193 bne t4, FFI_TYPE_FLOAT, arg7_doublep
194 l.s $f18, 6*FFI_SIZEOF_ARG(t9)
197 l.d $f18, 6*FFI_SIZEOF_ARG(t9)
200 SRL t4, t6, 7*FFI_FLAG_BITS
201 and t4, ((1<<FFI_FLAG_BITS)-1)
203 REG_L a7, 7*FFI_SIZEOF_ARG(t9)
206 bne t4, FFI_TYPE_FLOAT, arg8_doublep
207 l.s $f19, 7*FFI_SIZEOF_ARG(t9)
210 l.d $f19, 7*FFI_SIZEOF_ARG(t9)
214 # Load the function pointer
215 REG_L t9, 5*FFI_SIZEOF_ARG($fp)
217 # If the return value pointer is NULL, assume no return value.
218 REG_L t5, 4*FFI_SIZEOF_ARG($fp)
221 # Shift the return type flag over
222 SRL t6, 8*FFI_FLAG_BITS
224 beq t6, FFI_TYPE_SINT32, retint
225 bne t6, FFI_TYPE_INT, retfloat
228 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
233 bne t6, FFI_TYPE_FLOAT, retdouble
235 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
240 bne t6, FFI_TYPE_DOUBLE, retstruct_d
242 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
247 bne t6, FFI_TYPE_STRUCT_D, retstruct_f
249 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
254 bne t6, FFI_TYPE_STRUCT_F, retstruct_d_d
256 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
261 bne t6, FFI_TYPE_STRUCT_DD, retstruct_f_f
263 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
269 bne t6, FFI_TYPE_STRUCT_FF, retstruct_d_f
271 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
277 bne t6, FFI_TYPE_STRUCT_DF, retstruct_f_d
279 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
285 bne t6, FFI_TYPE_STRUCT_FD, retstruct_d_soft
287 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
293 bne t6, FFI_TYPE_STRUCT_D_SOFT, retstruct_f_soft
295 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
300 bne t6, FFI_TYPE_STRUCT_F_SOFT, retstruct_d_d_soft
302 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
307 bne t6, FFI_TYPE_STRUCT_DD_SOFT, retstruct_f_f_soft
309 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
315 bne t6, FFI_TYPE_STRUCT_FF_SOFT, retstruct_d_f_soft
317 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
323 bne t6, FFI_TYPE_STRUCT_DF_SOFT, retstruct_f_d_soft
325 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
331 bne t6, FFI_TYPE_STRUCT_FD_SOFT, retstruct_small
333 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
339 bne t6, FFI_TYPE_STRUCT_SMALL, retstruct_small2
341 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
346 bne t6, FFI_TYPE_STRUCT_SMALL2, retstruct
348 REG_L t4, 4*FFI_SIZEOF_ARG($fp)
360 REG_L $fp, SIZEOF_FRAME - 2*FFI_SIZEOF_ARG($sp) # Restore frame pointer
361 REG_L ra, SIZEOF_FRAME - 1*FFI_SIZEOF_ARG($sp) # Restore return address
362 ADDU $sp, SIZEOF_FRAME # Fix stack pointer
368 /* ffi_closure_N32. Expects address of the passed-in ffi_closure in t0
369 ($12). Stores any arguments passed in registers onto the stack,
370 then calls ffi_closure_mips_inner_N32, which then decodes
375 20 - Start of parameters, original sp
376 19 - Called function a7 save
377 18 - Called function a6 save
378 17 - Called function a5 save
379 16 - Called function a4 save
380 15 - Called function a3 save
381 14 - Called function a2 save
382 13 - Called function a1 save
383 12 - Called function a0 save
384 11 - Called function f19
385 10 - Called function f18
386 9 - Called function f17
387 8 - Called function f16
388 7 - Called function f15
389 6 - Called function f14
390 5 - Called function f13
391 4 - Called function f12
392 3 - return value high (v1 or $f2)
393 2 - return value low (v0 or $f0)
395 0 - gp save our sp points here
398 #define SIZEOF_FRAME2 (20 * FFI_SIZEOF_ARG)
400 #define A7_OFF2 (19 * FFI_SIZEOF_ARG)
401 #define A6_OFF2 (18 * FFI_SIZEOF_ARG)
402 #define A5_OFF2 (17 * FFI_SIZEOF_ARG)
403 #define A4_OFF2 (16 * FFI_SIZEOF_ARG)
404 #define A3_OFF2 (15 * FFI_SIZEOF_ARG)
405 #define A2_OFF2 (14 * FFI_SIZEOF_ARG)
406 #define A1_OFF2 (13 * FFI_SIZEOF_ARG)
407 #define A0_OFF2 (12 * FFI_SIZEOF_ARG)
409 #define F19_OFF2 (11 * FFI_SIZEOF_ARG)
410 #define F18_OFF2 (10 * FFI_SIZEOF_ARG)
411 #define F17_OFF2 (9 * FFI_SIZEOF_ARG)
412 #define F16_OFF2 (8 * FFI_SIZEOF_ARG)
413 #define F15_OFF2 (7 * FFI_SIZEOF_ARG)
414 #define F14_OFF2 (6 * FFI_SIZEOF_ARG)
415 #define F13_OFF2 (5 * FFI_SIZEOF_ARG)
416 #define F12_OFF2 (4 * FFI_SIZEOF_ARG)
418 #define V1_OFF2 (3 * FFI_SIZEOF_ARG)
419 #define V0_OFF2 (2 * FFI_SIZEOF_ARG)
421 #define RA_OFF2 (1 * FFI_SIZEOF_ARG)
422 #define GP_OFF2 (0 * FFI_SIZEOF_ARG)
425 .globl ffi_closure_N32
429 .frame $sp, SIZEOF_FRAME2, ra
430 .mask 0x90000000,-(SIZEOF_FRAME2 - RA_OFF2)
432 SUBU $sp, SIZEOF_FRAME2
434 .cpsetup t9, GP_OFF2, ffi_closure_N32
435 REG_S ra, RA_OFF2($sp) # Save return address
437 # Store all possible argument registers. If there are more than
438 # fit in registers, then they were stored on the stack.
439 REG_S a0, A0_OFF2($sp)
440 REG_S a1, A1_OFF2($sp)
441 REG_S a2, A2_OFF2($sp)
442 REG_S a3, A3_OFF2($sp)
443 REG_S a4, A4_OFF2($sp)
444 REG_S a5, A5_OFF2($sp)
445 REG_S a6, A6_OFF2($sp)
446 REG_S a7, A7_OFF2($sp)
448 # Store all possible float/double registers.
449 s.d $f12, F12_OFF2($sp)
450 s.d $f13, F13_OFF2($sp)
451 s.d $f14, F14_OFF2($sp)
452 s.d $f15, F15_OFF2($sp)
453 s.d $f16, F16_OFF2($sp)
454 s.d $f17, F17_OFF2($sp)
455 s.d $f18, F18_OFF2($sp)
456 s.d $f19, F19_OFF2($sp)
458 # Call ffi_closure_mips_inner_N32 to do the real work.
459 LA t9, ffi_closure_mips_inner_N32
460 move a0, $12 # Pointer to the ffi_closure
461 ADDU a1, $sp, V0_OFF2
462 ADDU a2, $sp, A0_OFF2
463 ADDU a3, $sp, F12_OFF2
466 # Return flags are in v0
467 bne v0, FFI_TYPE_SINT32, cls_retint
472 bne v0, FFI_TYPE_INT, cls_retfloat
473 REG_L v0, V0_OFF2($sp)
477 bne v0, FFI_TYPE_FLOAT, cls_retdouble
478 l.s $f0, V0_OFF2($sp)
482 bne v0, FFI_TYPE_DOUBLE, cls_retstruct_d
483 l.d $f0, V0_OFF2($sp)
487 bne v0, FFI_TYPE_STRUCT_D, cls_retstruct_f
488 l.d $f0, V0_OFF2($sp)
492 bne v0, FFI_TYPE_STRUCT_F, cls_retstruct_d_d
493 l.s $f0, V0_OFF2($sp)
497 bne v0, FFI_TYPE_STRUCT_DD, cls_retstruct_f_f
498 l.d $f0, V0_OFF2($sp)
499 l.d $f2, V1_OFF2($sp)
503 bne v0, FFI_TYPE_STRUCT_FF, cls_retstruct_d_f
504 l.s $f0, V0_OFF2($sp)
505 l.s $f2, V1_OFF2($sp)
509 bne v0, FFI_TYPE_STRUCT_DF, cls_retstruct_f_d
510 l.d $f0, V0_OFF2($sp)
511 l.s $f2, V1_OFF2($sp)
515 bne v0, FFI_TYPE_STRUCT_FD, cls_retstruct_small2
516 l.s $f0, V0_OFF2($sp)
517 l.d $f2, V1_OFF2($sp)
520 cls_retstruct_small2:
521 REG_L v0, V0_OFF2($sp)
522 REG_L v1, V1_OFF2($sp)
526 REG_L ra, RA_OFF2($sp) # Restore return address
528 ADDU $sp, SIZEOF_FRAME2
534 .section .eh_frame,"aw",@progbits
536 .4byte .LECIE1-.LSCIE1 # length
539 .byte 0x1 # Version 1
540 .ascii "\000" # Augmentation
541 .uleb128 0x1 # Code alignment 1
542 .sleb128 -4 # Data alignment -4
543 .byte 0x1f # Return Address $31
544 .byte 0xc # DW_CFA_def_cfa
545 .uleb128 0x1d # in $sp
546 .uleb128 0x0 # offset 0
547 .align EH_FRAME_ALIGN
551 .4byte .LEFDE1-.LASFDE1 # length.
553 .4byte .LASFDE1-.Lframe1 # CIE_pointer.
554 FDE_ADDR_BYTES .LFB3 # initial_location.
555 FDE_ADDR_BYTES .LFE3-.LFB3 # address_range.
556 .byte 0x4 # DW_CFA_advance_loc4
557 .4byte .LCFI0-.LFB3 # to .LCFI0
558 .byte 0xe # DW_CFA_def_cfa_offset
559 .uleb128 SIZEOF_FRAME # adjust stack.by SIZEOF_FRAME
560 .byte 0x4 # DW_CFA_advance_loc4
561 .4byte .LCFI1-.LCFI0 # to .LCFI1
562 .byte 0x9e # DW_CFA_offset of $fp
563 .uleb128 2*FFI_SIZEOF_ARG/4 #
564 .byte 0x9f # DW_CFA_offset of ra
565 .uleb128 1*FFI_SIZEOF_ARG/4 #
566 .byte 0x4 # DW_CFA_advance_loc4
567 .4byte .LCFI3-.LCFI1 # to .LCFI3
568 .byte 0xd # DW_CFA_def_cfa_register
569 .uleb128 0x1e # in $fp
570 .align EH_FRAME_ALIGN
573 .4byte .LEFDE3-.LASFDE3 # length
575 .4byte .LASFDE3-.Lframe1 # CIE_pointer.
576 FDE_ADDR_BYTES .LFB2 # initial_location.
577 FDE_ADDR_BYTES .LFE2-.LFB2 # address_range.
578 .byte 0x4 # DW_CFA_advance_loc4
579 .4byte .LCFI5-.LFB2 # to .LCFI5
580 .byte 0xe # DW_CFA_def_cfa_offset
581 .uleb128 SIZEOF_FRAME2 # adjust stack.by SIZEOF_FRAME
582 .byte 0x4 # DW_CFA_advance_loc4
583 .4byte .LCFI6-.LCFI5 # to .LCFI6
584 .byte 0x9c # DW_CFA_offset of $gp ($28)
585 .uleb128 (SIZEOF_FRAME2 - GP_OFF2)/4
586 .byte 0x9f # DW_CFA_offset of ra ($31)
587 .uleb128 (SIZEOF_FRAME2 - RA_OFF2)/4
588 .align EH_FRAME_ALIGN
590 #endif /* __GNUC__ */