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- doc: added disassembly examples for many platforms and calling conventions, for reference
author Tassilo Philipp
date Fri, 22 Nov 2019 23:08:59 +0100
parents
children 74c056b597b7
comparison
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326:09aaa2e774cd 327:c0390dc85a07
1 ; #include <stdlib.h>
2 ;
3 ; void leaf_call(int b, int c, int d, int e, int f, int g, int h)
4 ; {
5 ; }
6 ;
7 ; void nonleaf_call(int a, int b, int c, int d, int e, int f, int g, int h)
8 ; {
9 ; /* use some local data */
10 ; *(char*)alloca(220) = 'L';
11 ; leaf_call(b, c, d, e, f, g, h);
12 ; }
13 ;
14 ; int main()
15 ; {
16 ; nonleaf_call(0, 1, 2, 3, 4, 5, 6, 7);
17 ; return 0;
18 ; }
19
20
21
22 ; output from darwin-8.0.1-ppc w/ gcc 3.3
23
24 _leaf_call:
25 0: bf c1 ff f8 stmw 30, -8(1)
26 4: 94 21 ff d0 stwu 1, -48(1)
27 8: 7c 3e 0b 78 mr 30, 1
28 c: 90 7e 00 48 stw 3, 72(30)
29 10: 90 9e 00 4c stw 4, 76(30)
30 14: 90 be 00 50 stw 5, 80(30)
31 18: 90 de 00 54 stw 6, 84(30)
32 1c: 90 fe 00 58 stw 7, 88(30)
33 20: 91 1e 00 5c stw 8, 92(30)
34 24: 91 3e 00 60 stw 9, 96(30)
35 28: 80 21 00 00 lwz 1, 0(1)
36 2c: bb c1 ff f8 lmw 30, -8(1)
37 30: 4e 80 00 20 blr
38
39 _nonleaf_call:
40 34: 7c 08 02 a6 mflr 0 ; | lr -> gpr0
41 38: bf c1 ff f8 stmw 30, -8(1) ; | store gpr{30,31}
42 3c: 90 01 00 08 stw 0, 8(1) ; | prolog store lr
43 40: 94 21 ff b0 stwu 1, -80(1) ; | open frame and store sp at top of stack
44 44: 7c 3e 0b 78 mr 30, 1 ; / sp -> gpr30, latter used for some fixed addressing below
45 48: 90 7e 00 68 stw 3, 104(30) ; \
46 4c: 90 9e 00 6c stw 4, 108(30) ; |
47 50: 90 be 00 70 stw 5, 112(30) ; |
48 54: 90 de 00 74 stw 6, 116(30) ; |
49 58: 90 fe 00 78 stw 7, 120(30) ; | all in args -> spill area in prev frame
50 5c: 91 1e 00 7c stw 8, 124(30) ; |
51 60: 91 3e 00 80 stw 9, 128(30) ; |
52 64: 91 5e 00 84 stw 10, 132(30) ; |
53 68: 80 01 00 00 lwz 0, 0(1) ; fetch sp saved on stack of top by prolog -> gpr0, and ...
54 6c: 94 01 ff 10 stwu 0, -240(1) ; ... update it further up the stack for alloca(220) - with padding to guarantee alignment
55 70: 38 41 00 40 addi 2, 1, 64 ; |
56 74: 38 02 00 0f addi 0, 2, 15 ; | start of alloca()'d memory -> gpr2, by ...
57 78: 54 00 e1 3e srwi 0, 0, 4 ; | ... using gpr0 as helper to align to 16b, leaving at least 64b at top of stack
58 7c: 54 02 20 36 slwi 2, 0, 4 ; |
59 80: 38 00 00 4c li 0, 76 ; 'L' -> gpr0, and ...
60 84: 98 02 00 00 stb 0, 0(2) ; ... store in local area (of alloca()'d space)
61 88: 80 7e 00 6c lwz 3, 108(30) ; |
62 8c: 80 9e 00 70 lwz 4, 112(30) ; |
63 90: 80 be 00 74 lwz 5, 116(30) ; |
64 94: 80 de 00 78 lwz 6, 120(30) ; | arg 0,1,2,3,4,5,6 (fetched from spill area from prev frame)
65 98: 80 fe 00 7c lwz 7, 124(30) ; |
66 9c: 81 1e 00 80 lwz 8, 128(30) ; |
67 a0: 81 3e 00 84 lwz 9, 132(30) ; |
68 a4: 4b ff ff 5d bl .+67108700 ; call and put return address -> lr
69 a8: 80 21 00 00 lwz 1, 0(1) ; |
70 ac: 80 01 00 08 lwz 0, 8(1) ; |
71 b0: 7c 08 03 a6 mtlr 0 ; | epilog
72 b4: bb c1 ff f8 lmw 30, -8(1) ; |
73 b8: 4e 80 00 20 blr ; |
74
75 _main:
76 bc: 7c 08 02 a6 mflr 0 ; |
77 c0: bf c1 ff f8 stmw 30, -8(1) ; |
78 c4: 90 01 00 08 stw 0, 8(1) ; | prolog
79 c8: 94 21 ff b0 stwu 1, -80(1) ; |
80 cc: 7c 3e 0b 78 mr 30, 1 ; |
81 d0: 38 60 00 00 li 3, 0 ; arg 0
82 d4: 38 80 00 01 li 4, 1 ; arg 1
83 d8: 38 a0 00 02 li 5, 2 ; arg 2
84 dc: 38 c0 00 03 li 6, 3 ; arg 3
85 e0: 38 e0 00 04 li 7, 4 ; arg 4
86 e4: 39 00 00 05 li 8, 5 ; arg 5
87 e8: 39 20 00 06 li 9, 6 ; arg 6
88 ec: 39 40 00 07 li 10, 7 ; arg 7
89 f0: 4b ff ff 45 bl .+67108676 ; call and put return address -> lr
90 f4: 38 00 00 00 li 0, 0 ; return value (pointlessly) via gpr0 ...
91 f8: 7c 03 03 78 mr 3, 0 ; ... to gpr3
92 fc: 80 21 00 00 lwz 1, 0(1) ; |
93 100: 80 01 00 08 lwz 0, 8(1) ; |
94 104: 7c 08 03 a6 mtlr 0 ; | epilog
95 108: bb c1 ff f8 lmw 30, -8(1) ; |
96 10c: 4e 80 00 20 blr ; |
97
98
99
100 ; ------------- more than 8 int args ----------->
101
102 ; #include <stdlib.h>
103 ;
104 ; void leaf_call(int b, int c, int d, int e, int f, int g, int h, int i, int j)
105 ; {
106 ; }
107 ;
108 ; void nonleaf_call(int a, int b, int c, int d, int e, int f, int g, int h, int i, int j)
109 ; {
110 ; /* use some local data */
111 ; *(char*)alloca(220) = 'L';
112 ; leaf_call(b, c, d, e, f, g, h, i, j);
113 ; }
114 ;
115 ; int main()
116 ; {
117 ; nonleaf_call(0, 1, 2, 3, 4, 5, 6, 7, 8, 9);
118 ; return 0;
119 ; }
120
121
122
123 ; output from darwin-8.0.1-ppc w/ gcc 3.3
124
125 _leaf_call:
126 0: bf c1 ff f8 stmw 30, -8(1)
127 4: 94 21 ff d0 stwu 1, -48(1)
128 8: 7c 3e 0b 78 mr 30, 1
129 c: 90 7e 00 48 stw 3, 72(30)
130 10: 90 9e 00 4c stw 4, 76(30)
131 14: 90 be 00 50 stw 5, 80(30)
132 18: 90 de 00 54 stw 6, 84(30)
133 1c: 90 fe 00 58 stw 7, 88(30)
134 20: 91 1e 00 5c stw 8, 92(30)
135 24: 91 3e 00 60 stw 9, 96(30)
136 28: 91 5e 00 64 stw 10, 100(30)
137 2c: 80 21 00 00 lwz 1, 0(1)
138 30: bb c1 ff f8 lmw 30, -8(1)
139 34: 4e 80 00 20 blr
140
141 _nonleaf_call:
142 38: 7c 08 02 a6 mflr 0 ; |
143 3c: bf c1 ff f8 stmw 30, -8(1) ; |
144 40: 90 01 00 08 stw 0, 8(1) ; | prolog
145 44: 94 21 ff a0 stwu 1, -96(1) ; |
146 48: 7c 3e 0b 78 mr 30, 1 ; /
147 4c: 90 7e 00 78 stw 3, 120(30) ; \
148 50: 90 9e 00 7c stw 4, 124(30) ; |
149 54: 90 be 00 80 stw 5, 128(30) ; |
150 58: 90 de 00 84 stw 6, 132(30) ; |
151 5c: 90 fe 00 88 stw 7, 136(30) ; | in args 0,1,2,3,4,5,6,7 -> spill area in prev frame
152 60: 91 1e 00 8c stw 8, 140(30) ; |
153 64: 91 3e 00 90 stw 9, 144(30) ; |
154 68: 91 5e 00 94 stw 10, 148(30) ; |
155 6c: 80 01 00 00 lwz 0, 0(1) ; fetch sp saved on stack of top by prolog -> gpr0, and ...
156 70: 94 01 ff 10 stwu 0, -240(1) ; ... update it further up the stack for alloca(220) - with padding to guarantee alignment
157 74: 38 41 00 50 addi 2, 1, 80 ; |
158 78: 38 02 00 0f addi 0, 2, 15 ; | start of alloca()'d memory -> gpr2, by ...
159 7c: 54 00 e1 3e srwi 0, 0, 4 ; | ... using gpr0 as helper to align to 16b, leaving at least 64b at top of stack
160 80: 54 02 20 36 slwi 2, 0, 4 ; |
161 84: 38 00 00 4c li 0, 76 ; 'L' -> gpr0, and ...
162 88: 98 02 00 00 stb 0, 0(2) ; ... store in local area (of alloca()'d space)
163 8c: 80 1e 00 9c lwz 0, 156(30) ; arg 7 (fetched from stack param area from prev frame), and ...
164 90: 90 01 00 38 stw 0, 56(1) ; ... "pushed" onto stack
165 94: 80 7e 00 7c lwz 3, 124(30) ; |
166 98: 80 9e 00 80 lwz 4, 128(30) ; |
167 9c: 80 be 00 84 lwz 5, 132(30) ; |
168 a0: 80 de 00 88 lwz 6, 136(30) ; | arg 0,1,2,3,4,5,6 (fetched from spill area from prev frame)
169 a4: 80 fe 00 8c lwz 7, 140(30) ; |
170 a8: 81 1e 00 90 lwz 8, 144(30) ; |
171 ac: 81 3e 00 94 lwz 9, 148(30) ; |
172 b0: 81 5e 00 98 lwz 10, 152(30) ; arg 7 (fetched from stack param area from prev frame)
173 b4: 4b ff ff 4d bl .+67108684 ; call and put return address -> lr
174 b8: 80 21 00 00 lwz 1, 0(1) ; |
175 bc: 80 01 00 08 lwz 0, 8(1) ; |
176 c0: 7c 08 03 a6 mtlr 0 ; | epilog
177 c4: bb c1 ff f8 lmw 30, -8(1) ; |
178 c8: 4e 80 00 20 blr ; |
179
180 _main:
181 cc: 7c 08 02 a6 mflr 0 ; |
182 d0: bf c1 ff f8 stmw 30, -8(1) ; |
183 d4: 90 01 00 08 stw 0, 8(1) ; | prolog
184 d8: 94 21 ff a0 stwu 1, -96(1) ; |
185 dc: 7c 3e 0b 78 mr 30, 1 ; |
186 e0: 38 00 00 08 li 0, 8 ; arg 8, ...
187 e4: 90 01 00 38 stw 0, 56(1) ; ... "pushed" onto stack
188 e8: 38 00 00 09 li 0, 9 ; arg 9, ...
189 ec: 90 01 00 3c stw 0, 60(1) ; ... "pushed" onto stack
190 f0: 38 60 00 00 li 3, 0 ; arg 0
191 f4: 38 80 00 01 li 4, 1 ; arg 1
192 f8: 38 a0 00 02 li 5, 2 ; arg 2
193 fc: 38 c0 00 03 li 6, 3 ; arg 3
194 100: 38 e0 00 04 li 7, 4 ; arg 4
195 104: 39 00 00 05 li 8, 5 ; arg 5
196 108: 39 20 00 06 li 9, 6 ; arg 6
197 10c: 39 40 00 07 li 10, 7 ; arg 7
198 110: 4b ff ff 29 bl .+67108648 ; call and put return address -> lr
199 114: 38 00 00 00 li 0, 0 ; return value (pointlessly) via gpr0 ...
200 118: 7c 03 03 78 mr 3, 0 ; ... to gpr3
201 11c: 80 21 00 00 lwz 1, 0(1) ; |
202 120: 80 01 00 08 lwz 0, 8(1) ; |
203 124: 7c 08 03 a6 mtlr 0 ; | epilog
204 128: bb c1 ff f8 lmw 30, -8(1) ; |
205 12c: 4e 80 00 20 blr ; |
206
207
208
209 ; ------------- var args with ints and floats to see spilling (which remains only int regs), b/c doubles are passed via them and floats are promoted to doubles in (...) ----------->
210
211 ; #include <stdlib.h>
212 ; #include <stdarg.h>
213 ;
214 ; void leaf_call(int b, int c, int d, int e, float f, float g, int h, int i, float j)
215 ; {
216 ; }
217 ;
218 ; void nonleaf_call(int a, ...)
219 ; {
220 ; int b, c, d, e, h, i;
221 ; float f, g, j;
222 ; va_list ap;
223 ; va_start(ap, a);
224 ; b = va_arg(ap, int);
225 ; c = va_arg(ap, int);
226 ; d = va_arg(ap, int);
227 ; e = va_arg(ap, int);
228 ; f = (float)va_arg(ap, double);
229 ; g = (float)va_arg(ap, double);
230 ; h = va_arg(ap, int);
231 ; i = va_arg(ap, int);
232 ; j = (float)va_arg(ap, double);
233 ; /* use some local data */
234 ; *(char*)alloca(220) = 'L';
235 ; leaf_call(b, c, d, e, f, g, h, i, j);
236 ; }
237 ;
238 ; int main()
239 ; {
240 ; nonleaf_call(0, 1, 2, 3, 4, 5.f, 6.f, 7, 8, 9.f);
241 ; return 0;
242 ; }
243
244
245
246 ; output from darwin-8.0.1-ppc w/ gcc 3.3
247
248 _leaf_call:
249 0: bf c1 ff f8 stmw 30, -8(1)
250 4: 94 21 ff d0 stwu 1, -48(1)
251 8: 7c 3e 0b 78 mr 30, 1
252 c: 90 7e 00 48 stw 3, 72(30)
253 10: 90 9e 00 4c stw 4, 76(30)
254 14: 90 be 00 50 stw 5, 80(30)
255 18: 90 de 00 54 stw 6, 84(30)
256 1c: d0 3e 00 58 stfs 1, 88(30)
257 20: d0 5e 00 5c stfs 2, 92(30)
258 24: 91 3e 00 60 stw 9, 96(30)
259 28: 91 5e 00 64 stw 10, 100(30)
260 2c: d0 7e 00 68 stfs 3, 104(30)
261 30: 80 21 00 00 lwz 1, 0(1)
262 34: bb c1 ff f8 lmw 30, -8(1)
263 38: 4e 80 00 20 blr
264
265 _nonleaf_call:
266 3c: 7c 08 02 a6 mflr 0 ; |
267 40: bf c1 ff f8 stmw 30, -8(1) ; |
268 44: 90 01 00 08 stw 0, 8(1) ; | prolog
269 48: 94 21 ff 70 stwu 1, -144(1) ; |
270 4c: 7c 3e 0b 78 mr 30, 1 ; /
271 50: 90 9e 00 ac stw 4, 172(30) ; \
272 54: 90 be 00 b0 stw 5, 176(30) ; |
273 58: 90 de 00 b4 stw 6, 180(30) ; |
274 5c: 90 fe 00 b8 stw 7, 184(30) ; |
275 60: 91 1e 00 bc stw 8, 188(30) ; | in args ,1,2,3,4,5,6,7 -> spill area in prev frame
276 64: 91 3e 00 c0 stw 9, 192(30) ; |
277 68: 91 5e 00 c4 stw 10, 196(30) ; |
278 6c: 90 7e 00 a8 stw 3, 168(30) ; | <- this is in arg 0, the only named arg
279 70: 38 1e 00 ac addi 0, 30, 172 ; get pointer to first unnamed arg in gpr0 for vararg iteration, ...
280 74: 90 1e 00 74 stw 0, 116(30) ; ... and store read ptr in local area
281 78: 81 3e 00 74 lwz 9, 116(30) ; \ read ptr -> gpr0
282 7c: 80 5e 00 74 lwz 2, 116(30) ; | use gpr2 as helper ...
283 80: 38 02 00 04 addi 0, 2, 4 ; | ... to increment read ptr ...
284 84: 90 1e 00 74 stw 0, 116(30) ; | in arg 1 ... and restore
285 88: 80 09 00 00 lwz 0, 0(9) ; | load in arg 1, and ...
286 8c: 90 1e 00 50 stw 0, 80(30) ; / ... store in temp space in local area
287 90: 81 3e 00 74 lwz 9, 116(30) ; \
288 94: 80 5e 00 74 lwz 2, 116(30) ; |
289 98: 38 02 00 04 addi 0, 2, 4 ; |
290 9c: 90 1e 00 74 stw 0, 116(30) ; | in arg 2
291 a0: 80 09 00 00 lwz 0, 0(9) ; |
292 a4: 90 1e 00 54 stw 0, 84(30) ; /
293 a8: 81 3e 00 74 lwz 9, 116(30) ; \
294 ac: 80 5e 00 74 lwz 2, 116(30) ; |
295 b0: 38 02 00 04 addi 0, 2, 4 ; |
296 b4: 90 1e 00 74 stw 0, 116(30) ; | in arg 3
297 b8: 80 09 00 00 lwz 0, 0(9) ; |
298 bc: 90 1e 00 58 stw 0, 88(30) ; /
299 c0: 81 3e 00 74 lwz 9, 116(30) ; \
300 c4: 80 5e 00 74 lwz 2, 116(30) ; |
301 c8: 38 02 00 04 addi 0, 2, 4 ; |
302 cc: 90 1e 00 74 stw 0, 116(30) ; | in arg 4
303 d0: 80 09 00 00 lwz 0, 0(9) ; |
304 d4: 90 1e 00 5c stw 0, 92(30) ; /
305 d8: 81 3e 00 74 lwz 9, 116(30) ; \
306 dc: 80 5e 00 74 lwz 2, 116(30) ; |
307 e0: 38 02 00 08 addi 0, 2, 8 ; |
308 e4: 90 1e 00 74 stw 0, 116(30) ; | in arg 5 (float, promoted to double)
309 e8: c8 09 00 00 lfd 0, 0(9) ; |
310 ec: fc 00 00 18 frsp 0, 0 ; |
311 f0: d0 1e 00 68 stfs 0, 104(30) ; /
312 f4: 81 3e 00 74 lwz 9, 116(30) ; \
313 f8: 80 5e 00 74 lwz 2, 116(30) ; |
314 fc: 38 02 00 08 addi 0, 2, 8 ; |
315 100: 90 1e 00 74 stw 0, 116(30) ; | in arg 6 (float, promoted to double)
316 104: c8 09 00 00 lfd 0, 0(9) ; |
317 108: fc 00 00 18 frsp 0, 0 ; |
318 10c: d0 1e 00 6c stfs 0, 108(30) ; /
319 110: 81 3e 00 74 lwz 9, 116(30) ; \
320 114: 80 5e 00 74 lwz 2, 116(30) ; |
321 118: 38 02 00 04 addi 0, 2, 4 ; |
322 11c: 90 1e 00 74 stw 0, 116(30) ; | in arg 7
323 120: 80 09 00 00 lwz 0, 0(9) ; |
324 124: 90 1e 00 60 stw 0, 96(30) ; /
325 128: 81 3e 00 74 lwz 9, 116(30) ; \
326 12c: 80 5e 00 74 lwz 2, 116(30) ; |
327 130: 38 02 00 04 addi 0, 2, 4 ; |
328 134: 90 1e 00 74 stw 0, 116(30) ; | in arg 8
329 138: 80 09 00 00 lwz 0, 0(9) ; |
330 13c: 90 1e 00 64 stw 0, 100(30) ; /
331 140: 81 3e 00 74 lwz 9, 116(30) ; \
332 144: 80 5e 00 74 lwz 2, 116(30) ; |
333 148: 38 02 00 08 addi 0, 2, 8 ; |
334 14c: 90 1e 00 74 stw 0, 116(30) ; | in arg 9 (float, promoted to double)
335 150: c8 09 00 00 lfd 0, 0(9) ; |
336 154: fc 00 00 18 frsp 0, 0 ; |
337 158: d0 1e 00 70 stfs 0, 112(30) ; /
338 15c: 80 01 00 00 lwz 0, 0(1) ; fetch sp saved on stack of top by prolog -> g
339 160: 94 01 ff 10 stwu 0, -240(1) ; ... update it further up the stack for alloca
340 164: 38 41 00 50 addi 2, 1, 80 ; |
341 168: 38 02 00 0f addi 0, 2, 15 ; | start of alloca()'d memory -> gpr2, by ...
342 16c: 54 00 e1 3e srwi 0, 0, 4 ; | ... using gpr0 as helper to align to 16b, l
343 170: 54 02 20 36 slwi 2, 0, 4 ; |
344 174: 38 00 00 4c li 0, 76 ; 'L' -> gpr0, and ...
345 178: 98 02 00 00 stb 0, 0(2) ; ... store in local area (of alloca()'d space)
346 17c: 80 7e 00 50 lwz 3, 80(30) ; arg 0
347 180: 80 9e 00 54 lwz 4, 84(30) ; arg 1
348 184: 80 be 00 58 lwz 5, 88(30) ; arg 2
349 188: 80 de 00 5c lwz 6, 92(30) ; arg 3
350 18c: c0 3e 00 68 lfs 1, 104(30) ; arg 4 (float)
351 190: c0 5e 00 6c lfs 2, 108(30) ; arg 5 (float)
352 194: 81 3e 00 60 lwz 9, 96(30) ; arg 6
353 198: 81 5e 00 64 lwz 10, 100(30) ; arg 7
354 19c: c0 7e 00 70 lfs 3, 112(30) ; arg 8 (float)
355 1a0: 4b ff fe 61 bl .+67108448 ; call and put return address -> lr
356 1a4: 80 21 00 00 lwz 1, 0(1) ; |
357 1a8: 80 01 00 08 lwz 0, 8(1) ; |
358 1ac: 7c 08 03 a6 mtlr 0 ; | epilog
359 1b0: bb c1 ff f8 lmw 30, -8(1) ; |
360 1b4: 4e 80 00 20 blr ; |
361
362 _main:
363 1b8: 7c 08 02 a6 mflr 0 ; |
364 1bc: bf c1 ff f8 stmw 30, -8(1) ; |
365 1c0: 90 01 00 08 stw 0, 8(1) ; | prolog
366 1c4: 94 21 ff 90 stwu 1, -112(1) ; |
367 1c8: 7c 3e 0b 78 mr 30, 1 ; |
368 1cc: 42 9f 00 05 bcl 20, 31, .+4 ; ppc way to get PC in ...
369 1d0: 7f e8 02 a6 mflr 31 ; ... gpr31
370 1d4: 38 00 00 07 li 0, 7 ; arg 7, ...
371 1d8: 90 01 00 3c stw 0, 60(1) ; ... "pushed" onto stack
372 1dc: 38 00 00 08 li 0, 8 ; arg 8, ...
373 1e0: 90 01 00 40 stw 0, 64(1) ; ... "pushed" onto stack
374 1e4: 3c 40 40 22 lis 2, 16418 ; | arg 9, top-half (double b/c of vararg), and ...
375 1e8: 38 60 00 00 li 3, 0 ; | ... bottom-half ...
376 1ec: 90 41 00 44 stw 2, 68(1) ; | ... "pushed" into stack
377 1f0: 90 61 00 48 stw 3, 72(1) ; | "
378 1f4: 38 00 00 00 li 0, 0 ; arg 6, bottom-half, ...
379 1f8: 90 01 00 38 stw 0, 56(1) ; ... "pushed" onto stack (first word in param area, top-half passed via gpr10, see below)
380 1fc: 38 60 00 00 li 3, 0 ; arg 0
381 200: 38 80 00 01 li 4, 1 ; arg 1
382 204: 38 a0 00 02 li 5, 2 ; arg 2
383 208: 38 c0 00 03 li 6, 3 ; arg 3
384 20c: 38 e0 00 04 li 7, 4 ; arg 4
385 210: 3d 20 40 14 lis 9, 16404 ; | prep arg 5 (double b/c of vararg) for move to arg reg later: top-half -> gpr9
386 214: 39 40 00 00 li 10, 0 ; | bottom-half -> gpr10
387 218: 3c 5f 00 00 addis 2, 31, 0 ; PC -> gpr2, to ...
388 21c: c8 02 00 98 lfd 0, 152(2) ; ... load some static data (arg 5, the float) stored right after this function -> gpr0
389 220: 7d 28 4b 78 mr 8, 9 ; arg 5, top-half
390 224: 7d 49 53 78 mr 9, 10 ; arg 5, bottom-half
391 228: fc 20 00 90 fmr 1, 0 ; arg 5 in 1st fp reg
392 22c: 3d 60 40 18 lis 11, 16408 ; | prep arg 6 (double b/c of vararg) for move to arg reg later: top-half -> gpr11
393 230: 39 80 00 00 li 12, 0 ; | bottom-half -> gpr12 (this one is pointless, unused, bottom-half already placed on stack)
394 234: 3c 5f 00 00 addis 2, 31, 0 ; PC -> gpr2, to ...
395 238: c8 02 00 a0 lfd 0, 160(2) ; ... load some static data (arg 6, the 2nd float) stored right after this function -> gpr0
396 23c: 7d 6a 5b 78 mr 10, 11 ; arg 6, top-half
397 240: fc 40 00 90 fmr 2, 0 ; arg 5 in 2nd fp reg
398 244: c8 01 00 44 lfd 0, 68(1) ; arg 9, ...
399 248: fc 60 00 90 fmr 3, 0 ; ... -> 3rd fp reg
400 24c: 4b ff fd f1 bl .+67108336 ; call and put return address -> lr
401 250: 7c 03 03 78 mr 3, 0 ; return value @@@unsure why gpr0 is guaranteed to be 0 here
402 254: 80 21 00 00 lwz 1, 0(1) ; |
403 258: 80 01 00 08 lwz 0, 8(1) ; |
404 25c: 7c 08 03 a6 mtlr 0 ; | epilog
405 260: bb c1 ff f8 lmw 30, -8(1) ; |
406 264: 4e 80 00 20 blr ; |
407
408 ; vim: ft=asm
409