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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libffi/] [src/] [mips/] [o32.S] - Blame information for rev 732

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Line No. Rev Author Line
1 732 jeremybenn
/* -----------------------------------------------------------------------
2
   o32.S - Copyright (c) 1996, 1998, 2005  Red Hat, Inc.
3
 
4
   MIPS Foreign Function Interface
5
 
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:
13
 
14
   The above copyright notice and this permission notice shall be included
15
   in all copies or substantial portions of the Software.
16
 
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
   ----------------------------------------------------------------------- */
26
 
27
#define LIBFFI_ASM
28
#include 
29
#include 
30
 
31
/* Only build this code if we are compiling for o32 */
32
 
33
#if defined(FFI_MIPS_O32)
34
 
35
#define callback a0
36
#define bytes    a2
37
#define flags    a3
38
 
39
#define SIZEOF_FRAME    (4 * FFI_SIZEOF_ARG + 2 * FFI_SIZEOF_ARG)
40
#define A3_OFF          (SIZEOF_FRAME + 3 * FFI_SIZEOF_ARG)
41
#define FP_OFF          (SIZEOF_FRAME - 2 * FFI_SIZEOF_ARG)
42
#define RA_OFF          (SIZEOF_FRAME - 1 * FFI_SIZEOF_ARG)
43
 
44
        .abicalls
45
        .text
46
        .align  2
47
        .globl  ffi_call_O32
48
        .ent    ffi_call_O32
49
ffi_call_O32:
50
$LFB0:
51
        # Prologue
52
        SUBU    $sp, SIZEOF_FRAME       # Frame size
53
$LCFI0:
54
        REG_S   $fp, FP_OFF($sp)        # Save frame pointer
55
$LCFI1:
56
        REG_S   ra, RA_OFF($sp)         # Save return address
57
$LCFI2:
58
        move    $fp, $sp
59
 
60
$LCFI3:
61
        move    t9, callback            # callback function pointer
62
        REG_S   flags, A3_OFF($fp)      # flags
63
 
64
        # Allocate at least 4 words in the argstack
65
        LI      v0, 4 * FFI_SIZEOF_ARG
66
        blt     bytes, v0, sixteen
67
 
68
        ADDU    v0, bytes, 7    # make sure it is aligned
69
        and     v0, -8          # to an 8 byte boundry
70
 
71
sixteen:
72
        SUBU    $sp, v0         # move the stack pointer to reflect the
73
                                # arg space
74
 
75
        ADDU    a0, $sp, 4 * FFI_SIZEOF_ARG
76
 
77
        jalr    t9
78
 
79
        REG_L   t0, A3_OFF($fp)         # load the flags word
80
        SRL     t2, t0, 4               # shift our arg info
81
        and     t0, ((1<<4)-1)          # mask out the return type
82
 
83
        ADDU    $sp, 4 * FFI_SIZEOF_ARG         # adjust $sp to new args
84
 
85
        bnez    t0, pass_d                      # make it quick for int
86
        REG_L   a0, 0*FFI_SIZEOF_ARG($sp)       # just go ahead and load the
87
        REG_L   a1, 1*FFI_SIZEOF_ARG($sp)       # four regs.
88
        REG_L   a2, 2*FFI_SIZEOF_ARG($sp)
89
        REG_L   a3, 3*FFI_SIZEOF_ARG($sp)
90
        b       call_it
91
 
92
pass_d:
93
        bne     t0, FFI_ARGS_D, pass_f
94
        l.d     $f12, 0*FFI_SIZEOF_ARG($sp)     # load $fp regs from args
95
        REG_L   a2,   2*FFI_SIZEOF_ARG($sp)     # passing a double
96
        REG_L   a3,   3*FFI_SIZEOF_ARG($sp)
97
        b       call_it
98
 
99
pass_f:
100
        bne     t0, FFI_ARGS_F, pass_d_d
101
        l.s     $f12, 0*FFI_SIZEOF_ARG($sp)     # load $fp regs from args
102
        REG_L   a1,   1*FFI_SIZEOF_ARG($sp)     # passing a float
103
        REG_L   a2,   2*FFI_SIZEOF_ARG($sp)
104
        REG_L   a3,   3*FFI_SIZEOF_ARG($sp)
105
        b       call_it
106
 
107
pass_d_d:
108
        bne     t0, FFI_ARGS_DD, pass_f_f
109
        l.d     $f12, 0*FFI_SIZEOF_ARG($sp)     # load $fp regs from args
110
        l.d     $f14, 2*FFI_SIZEOF_ARG($sp)     # passing two doubles
111
        b       call_it
112
 
113
pass_f_f:
114
        bne     t0, FFI_ARGS_FF, pass_d_f
115
        l.s     $f12, 0*FFI_SIZEOF_ARG($sp)     # load $fp regs from args
116
        l.s     $f14, 1*FFI_SIZEOF_ARG($sp)     # passing two floats
117
        REG_L   a2,   2*FFI_SIZEOF_ARG($sp)
118
        REG_L   a3,   3*FFI_SIZEOF_ARG($sp)
119
        b       call_it
120
 
121
pass_d_f:
122
        bne     t0, FFI_ARGS_DF, pass_f_d
123
        l.d     $f12, 0*FFI_SIZEOF_ARG($sp)     # load $fp regs from args
124
        l.s     $f14, 2*FFI_SIZEOF_ARG($sp)     # passing double and float
125
        REG_L   a3,   3*FFI_SIZEOF_ARG($sp)
126
        b       call_it
127
 
128
pass_f_d:
129
 # assume that the only other combination must be float then double
130
 #      bne     t0, FFI_ARGS_F_D, call_it
131
        l.s     $f12, 0*FFI_SIZEOF_ARG($sp)     # load $fp regs from args
132
        l.d     $f14, 2*FFI_SIZEOF_ARG($sp)     # passing double and float
133
 
134
call_it:
135
        # Load the function pointer
136
        REG_L   t9, SIZEOF_FRAME + 5*FFI_SIZEOF_ARG($fp)
137
 
138
        # If the return value pointer is NULL, assume no return value.
139
        REG_L   t1, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
140
        beqz    t1, noretval
141
 
142
        bne     t2, FFI_TYPE_INT, retlonglong
143
        jalr    t9
144
        REG_L   t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
145
        REG_S   v0, 0(t0)
146
        b       epilogue
147
 
148
retlonglong:
149
        # Really any 64-bit int, signed or not.
150
        bne     t2, FFI_TYPE_UINT64, retfloat
151
        jalr    t9
152
        REG_L   t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
153
        REG_S   v1, 4(t0)
154
        REG_S   v0, 0(t0)
155
        b       epilogue
156
 
157
retfloat:
158
        bne     t2, FFI_TYPE_FLOAT, retdouble
159
        jalr    t9
160
        REG_L   t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
161
        s.s     $f0, 0(t0)
162
        b       epilogue
163
 
164
retdouble:
165
        bne     t2, FFI_TYPE_DOUBLE, noretval
166
        jalr    t9
167
        REG_L   t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
168
        s.d     $f0, 0(t0)
169
        b       epilogue
170
 
171
noretval:
172
        jalr    t9
173
 
174
        # Epilogue
175
epilogue:
176
        move    $sp, $fp
177
        REG_L   $fp, FP_OFF($sp)        # Restore frame pointer
178
        REG_L   ra, RA_OFF($sp)         # Restore return address
179
        ADDU    $sp, SIZEOF_FRAME       # Fix stack pointer
180
        j       ra
181
 
182
$LFE0:
183
        .end    ffi_call_O32
184
 
185
 
186
/* ffi_closure_O32. Expects address of the passed-in ffi_closure
187
        in t4 ($12). Stores any arguments passed in registers onto the
188
        stack, then calls ffi_closure_mips_inner_O32, which
189
        then decodes them.
190
 
191
        Stack layout:
192
 
193
         3 - a3 save
194
         2 - a2 save
195
         1 - a1 save
196
 
197
        -1 - ra save
198
        -2 - fp save
199
        -3 - $16 (s0) save
200
        -4 - cprestore
201
        -5 - return value high (v1)
202
        -6 - return value low (v0)
203
        -7 - f14 (le high, be low)
204
        -8 - f14 (le low, be high)
205
        -9 - f12 (le high, be low)
206
       -10 - f12 (le low, be high)
207
       -11 - Called function a3 save
208
       -12 - Called function a2 save
209
       -13 - Called function a1 save
210
       -14 - Called function a0 save, our sp and fp point here
211
         */
212
 
213
#define SIZEOF_FRAME2   (14 * FFI_SIZEOF_ARG)
214
#define A3_OFF2         (SIZEOF_FRAME2 + 3 * FFI_SIZEOF_ARG)
215
#define A2_OFF2         (SIZEOF_FRAME2 + 2 * FFI_SIZEOF_ARG)
216
#define A1_OFF2         (SIZEOF_FRAME2 + 1 * FFI_SIZEOF_ARG)
217
#define A0_OFF2         (SIZEOF_FRAME2 + 0 * FFI_SIZEOF_ARG)
218
#define RA_OFF2         (SIZEOF_FRAME2 - 1 * FFI_SIZEOF_ARG)
219
#define FP_OFF2         (SIZEOF_FRAME2 - 2 * FFI_SIZEOF_ARG)
220
#define S0_OFF2         (SIZEOF_FRAME2 - 3 * FFI_SIZEOF_ARG)
221
#define GP_OFF2         (SIZEOF_FRAME2 - 4 * FFI_SIZEOF_ARG)
222
#define V1_OFF2         (SIZEOF_FRAME2 - 5 * FFI_SIZEOF_ARG)
223
#define V0_OFF2         (SIZEOF_FRAME2 - 6 * FFI_SIZEOF_ARG)
224
#define FA_1_1_OFF2     (SIZEOF_FRAME2 - 7 * FFI_SIZEOF_ARG)
225
#define FA_1_0_OFF2     (SIZEOF_FRAME2 - 8 * FFI_SIZEOF_ARG)
226
#define FA_0_1_OFF2     (SIZEOF_FRAME2 - 9 * FFI_SIZEOF_ARG)
227
#define FA_0_0_OFF2     (SIZEOF_FRAME2 - 10 * FFI_SIZEOF_ARG)
228
 
229
        .text
230
        .align  2
231
        .globl  ffi_closure_O32
232
        .ent    ffi_closure_O32
233
ffi_closure_O32:
234
$LFB1:
235
        # Prologue
236
        .frame  $fp, SIZEOF_FRAME2, ra
237
        .set    noreorder
238
        .cpload t9
239
        .set    reorder
240
        SUBU    $sp, SIZEOF_FRAME2
241
        .cprestore GP_OFF2
242
$LCFI4:
243
        REG_S   $16, S0_OFF2($sp)        # Save s0
244
        REG_S   $fp, FP_OFF2($sp)        # Save frame pointer
245
        REG_S   ra, RA_OFF2($sp)         # Save return address
246
$LCFI6:
247
        move    $fp, $sp
248
 
249
$LCFI7:
250
        # Store all possible argument registers. If there are more than
251
        # four arguments, then they are stored above where we put a3.
252
        REG_S   a0, A0_OFF2($fp)
253
        REG_S   a1, A1_OFF2($fp)
254
        REG_S   a2, A2_OFF2($fp)
255
        REG_S   a3, A3_OFF2($fp)
256
 
257
        # Load ABI enum to s0
258
        REG_L   $16, 20($12)    # cif pointer follows tramp.
259
        REG_L   $16, 0($16)     # abi is first member.
260
 
261
        li      $13, 1          # FFI_O32
262
        bne     $16, $13, 1f    # Skip fp save if FFI_O32_SOFT_FLOAT
263
 
264
        # Store all possible float/double registers.
265
        s.d     $f12, FA_0_0_OFF2($fp)
266
        s.d     $f14, FA_1_0_OFF2($fp)
267
1:
268
        # Call ffi_closure_mips_inner_O32 to do the work.
269
        la      t9, ffi_closure_mips_inner_O32
270
        move    a0, $12  # Pointer to the ffi_closure
271
        addu    a1, $fp, V0_OFF2
272
        addu    a2, $fp, A0_OFF2
273
        addu    a3, $fp, FA_0_0_OFF2
274
        jalr    t9
275
 
276
        # Load the return value into the appropriate register.
277
        move    $8, $2
278
        li      $9, FFI_TYPE_VOID
279
        beq     $8, $9, closure_done
280
 
281
        li      $13, 1          # FFI_O32
282
        bne     $16, $13, 1f    # Skip fp restore if FFI_O32_SOFT_FLOAT
283
 
284
        li      $9, FFI_TYPE_FLOAT
285
        l.s     $f0, V0_OFF2($fp)
286
        beq     $8, $9, closure_done
287
 
288
        li      $9, FFI_TYPE_DOUBLE
289
        l.d     $f0, V0_OFF2($fp)
290
        beq     $8, $9, closure_done
291
1:
292
        REG_L   $3, V1_OFF2($fp)
293
        REG_L   $2, V0_OFF2($fp)
294
 
295
closure_done:
296
        # Epilogue
297
        move    $sp, $fp
298
        REG_L   $16, S0_OFF2($sp)        # Restore s0
299
        REG_L   $fp, FP_OFF2($sp)        # Restore frame pointer
300
        REG_L   ra,  RA_OFF2($sp)        # Restore return address
301
        ADDU    $sp, SIZEOF_FRAME2
302
        j       ra
303
$LFE1:
304
        .end    ffi_closure_O32
305
 
306
/* DWARF-2 unwind info. */
307
 
308
        .section        .eh_frame,"a",@progbits
309
$Lframe0:
310
        .4byte  $LECIE0-$LSCIE0  # Length of Common Information Entry
311
$LSCIE0:
312
        .4byte  0x0      # CIE Identifier Tag
313
        .byte   0x1      # CIE Version
314
        .ascii "zR\0"    # CIE Augmentation
315
        .uleb128 0x1     # CIE Code Alignment Factor
316
        .sleb128 4       # CIE Data Alignment Factor
317
        .byte   0x1f     # CIE RA Column
318
        .uleb128 0x1     # Augmentation size
319
        .byte   0x00     # FDE Encoding (absptr)
320
        .byte   0xc      # DW_CFA_def_cfa
321
        .uleb128 0x1d
322
        .uleb128 0x0
323
        .align  2
324
$LECIE0:
325
$LSFDE0:
326
        .4byte  $LEFDE0-$LASFDE0         # FDE Length
327
$LASFDE0:
328
        .4byte  $LASFDE0-$Lframe0        # FDE CIE offset
329
        .4byte  $LFB0    # FDE initial location
330
        .4byte  $LFE0-$LFB0      # FDE address range
331
        .uleb128 0x0     # Augmentation size
332
        .byte   0x4      # DW_CFA_advance_loc4
333
        .4byte  $LCFI0-$LFB0
334
        .byte   0xe      # DW_CFA_def_cfa_offset
335
        .uleb128 0x18
336
        .byte   0x4      # DW_CFA_advance_loc4
337
        .4byte  $LCFI2-$LCFI0
338
        .byte   0x11     # DW_CFA_offset_extended_sf
339
        .uleb128 0x1e    # $fp
340
        .sleb128 -2      # SIZEOF_FRAME2 - 2*FFI_SIZEOF_ARG($sp)
341
        .byte   0x11     # DW_CFA_offset_extended_sf
342
        .uleb128 0x1f    # $ra
343
        .sleb128 -1      # SIZEOF_FRAME2 - 1*FFI_SIZEOF_ARG($sp)
344
        .byte   0x4      # DW_CFA_advance_loc4
345
        .4byte  $LCFI3-$LCFI2
346
        .byte   0xc      # DW_CFA_def_cfa
347
        .uleb128 0x1e
348
        .uleb128 0x18
349
        .align  2
350
$LEFDE0:
351
$LSFDE1:
352
        .4byte  $LEFDE1-$LASFDE1         # FDE Length
353
$LASFDE1:
354
        .4byte  $LASFDE1-$Lframe0        # FDE CIE offset
355
        .4byte  $LFB1    # FDE initial location
356
        .4byte  $LFE1-$LFB1      # FDE address range
357
        .uleb128 0x0     # Augmentation size
358
        .byte   0x4      # DW_CFA_advance_loc4
359
        .4byte  $LCFI4-$LFB1
360
        .byte   0xe      # DW_CFA_def_cfa_offset
361
        .uleb128 0x38
362
        .byte   0x4      # DW_CFA_advance_loc4
363
        .4byte  $LCFI6-$LCFI4
364
        .byte   0x11     # DW_CFA_offset_extended_sf
365
        .uleb128 0x10    # $16
366
        .sleb128 -3      # SIZEOF_FRAME2 - 3*FFI_SIZEOF_ARG($sp)
367
        .byte   0x11     # DW_CFA_offset_extended_sf
368
        .uleb128 0x1e    # $fp
369
        .sleb128 -2      # SIZEOF_FRAME2 - 2*FFI_SIZEOF_ARG($sp)
370
        .byte   0x11     # DW_CFA_offset_extended_sf
371
        .uleb128 0x1f    # $ra
372
        .sleb128 -1      # SIZEOF_FRAME2 - 1*FFI_SIZEOF_ARG($sp)
373
        .byte   0x4      # DW_CFA_advance_loc4
374
        .4byte  $LCFI7-$LCFI6
375
        .byte   0xc      # DW_CFA_def_cfa
376
        .uleb128 0x1e
377
        .uleb128 0x38
378
        .align  2
379
$LEFDE1:
380
 
381
#endif

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