1 /* -----------------------------------------------------------------------
2 o32.S - Copyright (c) 1996, 1998, 2005 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 o32 */
33 #if defined(FFI_MIPS_O32)
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)
52 SUBU $sp, SIZEOF_FRAME # Frame size
54 REG_S $fp, FP_OFF($sp) # Save frame pointer
56 REG_S ra, RA_OFF($sp) # Save return address
61 move t9, callback # callback function pointer
62 REG_S flags, A3_OFF($fp) # flags
64 # Allocate at least 4 words in the argstack
65 LI v0, 4 * FFI_SIZEOF_ARG
66 blt bytes, v0, sixteen
68 ADDU v0, bytes, 7 # make sure it is aligned
69 and v0, -8 # to an 8 byte boundry
72 SUBU $sp, v0 # move the stack pointer to reflect the
75 ADDU a0, $sp, 4 * FFI_SIZEOF_ARG
79 REG_L t0, A3_OFF($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
83 ADDU $sp, 4 * FFI_SIZEOF_ARG # adjust $sp to new args
85 bnez t0, pass_d # make it quick for int
86 REG_L a0, 0*FFI_SIZEOF_ARG($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)
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)
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)
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
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)
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)
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
135 # Load the function pointer
136 REG_L t9, SIZEOF_FRAME + 5*FFI_SIZEOF_ARG($fp)
138 # If the return value pointer is NULL, assume no return value.
139 REG_L t1, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
142 bne t2, FFI_TYPE_INT, retlonglong
144 REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
149 # Really any 64-bit int, signed or not.
150 bne t2, FFI_TYPE_UINT64, retfloat
152 REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
158 bne t2, FFI_TYPE_FLOAT, retdouble
160 REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
165 bne t2, FFI_TYPE_DOUBLE, noretval
167 REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($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
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
196 0 - a0 save, original sp
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
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)
231 .globl ffi_closure_O32
236 .frame $fp, SIZEOF_FRAME2, ra
240 SUBU $sp, SIZEOF_FRAME2
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($sp) # Save return address
250 # Store all possible argument registers. If there are more than
251 # four arguments, then they are stored above where we put a3.
252 REG_S a0, A0_OFF2($fp)
253 REG_S a1, A1_OFF2($fp)
254 REG_S a2, A2_OFF2($fp)
255 REG_S a3, A3_OFF2($fp)
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.
262 bne $16, $13, 1f # Skip fp save if FFI_O32_SOFT_FLOAT
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)
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
276 # Load the return value into the appropriate register.
279 beq $8, $9, closure_done
282 bne $16, $13, 1f # Skip fp restore if FFI_O32_SOFT_FLOAT
284 li $9, FFI_TYPE_FLOAT
285 l.s $f0, V0_OFF2($fp)
286 beq $8, $9, closure_done
288 li $9, FFI_TYPE_DOUBLE
289 l.d $f0, V0_OFF2($fp)
290 beq $8, $9, closure_done
292 REG_L $3, V1_OFF2($fp)
293 REG_L $2, V0_OFF2($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
306 /* DWARF-2 unwind info. */
308 .section .eh_frame,"a",@progbits
310 .4byte $LECIE0-$LSCIE0 # Length of Common Information Entry
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
326 .4byte $LEFDE0-$LASFDE0 # FDE Length
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
334 .byte 0xe # DW_CFA_def_cfa_offset
336 .byte 0x4 # DW_CFA_advance_loc4
338 .byte 0x11 # DW_CFA_offset_extended_sf
340 .sleb128 -2 # SIZEOF_FRAME2 - 2*FFI_SIZEOF_ARG($sp)
341 .byte 0x11 # DW_CFA_offset_extended_sf
343 .sleb128 -1 # SIZEOF_FRAME2 - 1*FFI_SIZEOF_ARG($sp)
344 .byte 0x4 # DW_CFA_advance_loc4
346 .byte 0xc # DW_CFA_def_cfa
352 .4byte $LEFDE1-$LASFDE1 # FDE Length
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
360 .byte 0xe # DW_CFA_def_cfa_offset
362 .byte 0x4 # DW_CFA_advance_loc4
364 .byte 0x11 # DW_CFA_offset_extended_sf
366 .sleb128 -3 # SIZEOF_FRAME2 - 3*FFI_SIZEOF_ARG($sp)
367 .byte 0x11 # DW_CFA_offset_extended_sf
369 .sleb128 -2 # SIZEOF_FRAME2 - 2*FFI_SIZEOF_ARG($sp)
370 .byte 0x11 # DW_CFA_offset_extended_sf
372 .sleb128 -1 # SIZEOF_FRAME2 - 1*FFI_SIZEOF_ARG($sp)
373 .byte 0x4 # DW_CFA_advance_loc4
375 .byte 0xc # DW_CFA_def_cfa