Commit | Line | Data |
---|---|---|
f50a7f3d | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
3752e453 ME |
2 | /* |
3 | * Copyright 2014, Michael Ellerman, IBM Corp. | |
3752e453 ME |
4 | */ |
5 | ||
6 | #include <ppc-asm.h> | |
7 | #include "reg.h" | |
8 | ||
9 | ||
10 | /* ppc-asm.h defines most of the reg aliases, but not r1/r2. */ | |
11 | #define r1 1 | |
12 | #define r2 2 | |
13 | ||
14 | #define RFEBB .long 0x4c000924 | |
15 | ||
16 | /* Stack layout: | |
17 | * | |
18 | * ^ | |
19 | * User stack | | |
20 | * Back chain ------+ <- r1 <-------+ | |
21 | * ... | | |
22 | * Red zone / ABI Gap | | |
23 | * ... | | |
24 | * vr63 <+ | | |
25 | * vr0 | | | |
26 | * VSCR | | | |
27 | * FSCR | | | |
28 | * r31 | Save area | | |
29 | * r0 | | | |
30 | * XER | | | |
31 | * CTR | | | |
32 | * LR | | | |
33 | * CCR <+ | | |
34 | * ... <+ | | |
35 | * LR | Caller frame | | |
36 | * CCR | | | |
37 | * Back chain <+ <- updated r1 --------+ | |
38 | * | |
39 | */ | |
40 | ||
41 | #if defined(_CALL_ELF) && _CALL_ELF == 2 | |
42 | #define ABIGAP 512 | |
43 | #else | |
44 | #define ABIGAP 288 | |
45 | #endif | |
46 | ||
47 | #define NR_GPR 32 | |
48 | #define NR_SPR 6 | |
49 | #define NR_VSR 64 | |
50 | ||
51 | #define SAVE_AREA ((NR_GPR + NR_SPR) * 8 + (NR_VSR * 16)) | |
52 | #define CALLER_FRAME 112 | |
53 | ||
54 | #define STACK_FRAME (ABIGAP + SAVE_AREA + CALLER_FRAME) | |
55 | ||
56 | #define CCR_SAVE (CALLER_FRAME) | |
57 | #define LR_SAVE (CCR_SAVE + 8) | |
58 | #define CTR_SAVE (LR_SAVE + 8) | |
59 | #define XER_SAVE (CTR_SAVE + 8) | |
60 | #define GPR_SAVE(n) (XER_SAVE + 8 + (8 * n)) | |
61 | #define FSCR_SAVE (GPR_SAVE(31) + 8) | |
62 | #define VSCR_SAVE (FSCR_SAVE + 8) | |
63 | #define VSR_SAVE(n) (VSCR_SAVE + 8 + (16 * n)) | |
64 | ||
65 | #define SAVE_GPR(n) std n,GPR_SAVE(n)(r1) | |
66 | #define REST_GPR(n) ld n,GPR_SAVE(n)(r1) | |
67 | #define TRASH_GPR(n) lis n,0xaaaa | |
68 | ||
69 | #define SAVE_VSR(n, b) li b, VSR_SAVE(n); stxvd2x n,b,r1 | |
70 | #define LOAD_VSR(n, b) li b, VSR_SAVE(n); lxvd2x n,b,r1 | |
71 | ||
72 | #define LOAD_REG_IMMEDIATE(reg,expr) \ | |
73 | lis reg,(expr)@highest; \ | |
74 | ori reg,reg,(expr)@higher; \ | |
75 | rldicr reg,reg,32,31; \ | |
76 | oris reg,reg,(expr)@h; \ | |
77 | ori reg,reg,(expr)@l; | |
78 | ||
79 | ||
80 | #if defined(_CALL_ELF) && _CALL_ELF == 2 | |
81 | #define ENTRY_POINT(name) \ | |
82 | .type FUNC_NAME(name),@function; \ | |
83 | .globl FUNC_NAME(name); \ | |
84 | FUNC_NAME(name): | |
85 | ||
86 | #define RESTORE_TOC(name) \ | |
87 | /* Restore our TOC pointer using our entry point */ \ | |
88 | LOAD_REG_IMMEDIATE(r12, name) \ | |
89 | 0: addis r2,r12,(.TOC.-0b)@ha; \ | |
90 | addi r2,r2,(.TOC.-0b)@l; | |
91 | ||
92 | #else | |
93 | #define ENTRY_POINT(name) FUNC_START(name) | |
94 | #define RESTORE_TOC(name) \ | |
95 | /* Restore our TOC pointer via our opd entry */ \ | |
96 | LOAD_REG_IMMEDIATE(r2, name) \ | |
97 | ld r2,8(r2); | |
98 | #endif | |
99 | ||
100 | .text | |
101 | ||
102 | ENTRY_POINT(ebb_handler) | |
103 | stdu r1,-STACK_FRAME(r1) | |
104 | SAVE_GPR(0) | |
105 | mflr r0 | |
106 | std r0,LR_SAVE(r1) | |
107 | mfcr r0 | |
108 | std r0,CCR_SAVE(r1) | |
109 | mfctr r0 | |
110 | std r0,CTR_SAVE(r1) | |
111 | mfxer r0 | |
112 | std r0,XER_SAVE(r1) | |
113 | SAVE_GPR(2) | |
114 | SAVE_GPR(3) | |
115 | SAVE_GPR(4) | |
116 | SAVE_GPR(5) | |
117 | SAVE_GPR(6) | |
118 | SAVE_GPR(7) | |
119 | SAVE_GPR(8) | |
120 | SAVE_GPR(9) | |
121 | SAVE_GPR(10) | |
122 | SAVE_GPR(11) | |
123 | SAVE_GPR(12) | |
124 | SAVE_GPR(13) | |
125 | SAVE_GPR(14) | |
126 | SAVE_GPR(15) | |
127 | SAVE_GPR(16) | |
128 | SAVE_GPR(17) | |
129 | SAVE_GPR(18) | |
130 | SAVE_GPR(19) | |
131 | SAVE_GPR(20) | |
132 | SAVE_GPR(21) | |
133 | SAVE_GPR(22) | |
134 | SAVE_GPR(23) | |
135 | SAVE_GPR(24) | |
136 | SAVE_GPR(25) | |
137 | SAVE_GPR(26) | |
138 | SAVE_GPR(27) | |
139 | SAVE_GPR(28) | |
140 | SAVE_GPR(29) | |
141 | SAVE_GPR(30) | |
142 | SAVE_GPR(31) | |
143 | SAVE_VSR(0, r3) | |
144 | mffs f0 | |
145 | stfd f0, FSCR_SAVE(r1) | |
146 | mfvscr f0 | |
147 | stfd f0, VSCR_SAVE(r1) | |
148 | SAVE_VSR(1, r3) | |
149 | SAVE_VSR(2, r3) | |
150 | SAVE_VSR(3, r3) | |
151 | SAVE_VSR(4, r3) | |
152 | SAVE_VSR(5, r3) | |
153 | SAVE_VSR(6, r3) | |
154 | SAVE_VSR(7, r3) | |
155 | SAVE_VSR(8, r3) | |
156 | SAVE_VSR(9, r3) | |
157 | SAVE_VSR(10, r3) | |
158 | SAVE_VSR(11, r3) | |
159 | SAVE_VSR(12, r3) | |
160 | SAVE_VSR(13, r3) | |
161 | SAVE_VSR(14, r3) | |
162 | SAVE_VSR(15, r3) | |
163 | SAVE_VSR(16, r3) | |
164 | SAVE_VSR(17, r3) | |
165 | SAVE_VSR(18, r3) | |
166 | SAVE_VSR(19, r3) | |
167 | SAVE_VSR(20, r3) | |
168 | SAVE_VSR(21, r3) | |
169 | SAVE_VSR(22, r3) | |
170 | SAVE_VSR(23, r3) | |
171 | SAVE_VSR(24, r3) | |
172 | SAVE_VSR(25, r3) | |
173 | SAVE_VSR(26, r3) | |
174 | SAVE_VSR(27, r3) | |
175 | SAVE_VSR(28, r3) | |
176 | SAVE_VSR(29, r3) | |
177 | SAVE_VSR(30, r3) | |
178 | SAVE_VSR(31, r3) | |
179 | SAVE_VSR(32, r3) | |
180 | SAVE_VSR(33, r3) | |
181 | SAVE_VSR(34, r3) | |
182 | SAVE_VSR(35, r3) | |
183 | SAVE_VSR(36, r3) | |
184 | SAVE_VSR(37, r3) | |
185 | SAVE_VSR(38, r3) | |
186 | SAVE_VSR(39, r3) | |
187 | SAVE_VSR(40, r3) | |
188 | SAVE_VSR(41, r3) | |
189 | SAVE_VSR(42, r3) | |
190 | SAVE_VSR(43, r3) | |
191 | SAVE_VSR(44, r3) | |
192 | SAVE_VSR(45, r3) | |
193 | SAVE_VSR(46, r3) | |
194 | SAVE_VSR(47, r3) | |
195 | SAVE_VSR(48, r3) | |
196 | SAVE_VSR(49, r3) | |
197 | SAVE_VSR(50, r3) | |
198 | SAVE_VSR(51, r3) | |
199 | SAVE_VSR(52, r3) | |
200 | SAVE_VSR(53, r3) | |
201 | SAVE_VSR(54, r3) | |
202 | SAVE_VSR(55, r3) | |
203 | SAVE_VSR(56, r3) | |
204 | SAVE_VSR(57, r3) | |
205 | SAVE_VSR(58, r3) | |
206 | SAVE_VSR(59, r3) | |
207 | SAVE_VSR(60, r3) | |
208 | SAVE_VSR(61, r3) | |
209 | SAVE_VSR(62, r3) | |
210 | SAVE_VSR(63, r3) | |
211 | ||
212 | TRASH_GPR(2) | |
213 | TRASH_GPR(3) | |
214 | TRASH_GPR(4) | |
215 | TRASH_GPR(5) | |
216 | TRASH_GPR(6) | |
217 | TRASH_GPR(7) | |
218 | TRASH_GPR(8) | |
219 | TRASH_GPR(9) | |
220 | TRASH_GPR(10) | |
221 | TRASH_GPR(11) | |
222 | TRASH_GPR(12) | |
223 | TRASH_GPR(14) | |
224 | TRASH_GPR(15) | |
225 | TRASH_GPR(16) | |
226 | TRASH_GPR(17) | |
227 | TRASH_GPR(18) | |
228 | TRASH_GPR(19) | |
229 | TRASH_GPR(20) | |
230 | TRASH_GPR(21) | |
231 | TRASH_GPR(22) | |
232 | TRASH_GPR(23) | |
233 | TRASH_GPR(24) | |
234 | TRASH_GPR(25) | |
235 | TRASH_GPR(26) | |
236 | TRASH_GPR(27) | |
237 | TRASH_GPR(28) | |
238 | TRASH_GPR(29) | |
239 | TRASH_GPR(30) | |
240 | TRASH_GPR(31) | |
241 | ||
242 | RESTORE_TOC(ebb_handler) | |
243 | ||
244 | /* | |
245 | * r13 is our TLS pointer. We leave whatever value was in there when the | |
246 | * EBB fired. That seems to be OK because once set the TLS pointer is not | |
247 | * changed - but presumably that could change in future. | |
248 | */ | |
249 | ||
250 | bl ebb_hook | |
251 | nop | |
252 | ||
253 | /* r2 may be changed here but we don't care */ | |
254 | ||
255 | lfd f0, FSCR_SAVE(r1) | |
256 | mtfsf 0xff,f0 | |
257 | lfd f0, VSCR_SAVE(r1) | |
258 | mtvscr f0 | |
259 | LOAD_VSR(0, r3) | |
260 | LOAD_VSR(1, r3) | |
261 | LOAD_VSR(2, r3) | |
262 | LOAD_VSR(3, r3) | |
263 | LOAD_VSR(4, r3) | |
264 | LOAD_VSR(5, r3) | |
265 | LOAD_VSR(6, r3) | |
266 | LOAD_VSR(7, r3) | |
267 | LOAD_VSR(8, r3) | |
268 | LOAD_VSR(9, r3) | |
269 | LOAD_VSR(10, r3) | |
270 | LOAD_VSR(11, r3) | |
271 | LOAD_VSR(12, r3) | |
272 | LOAD_VSR(13, r3) | |
273 | LOAD_VSR(14, r3) | |
274 | LOAD_VSR(15, r3) | |
275 | LOAD_VSR(16, r3) | |
276 | LOAD_VSR(17, r3) | |
277 | LOAD_VSR(18, r3) | |
278 | LOAD_VSR(19, r3) | |
279 | LOAD_VSR(20, r3) | |
280 | LOAD_VSR(21, r3) | |
281 | LOAD_VSR(22, r3) | |
282 | LOAD_VSR(23, r3) | |
283 | LOAD_VSR(24, r3) | |
284 | LOAD_VSR(25, r3) | |
285 | LOAD_VSR(26, r3) | |
286 | LOAD_VSR(27, r3) | |
287 | LOAD_VSR(28, r3) | |
288 | LOAD_VSR(29, r3) | |
289 | LOAD_VSR(30, r3) | |
290 | LOAD_VSR(31, r3) | |
291 | LOAD_VSR(32, r3) | |
292 | LOAD_VSR(33, r3) | |
293 | LOAD_VSR(34, r3) | |
294 | LOAD_VSR(35, r3) | |
295 | LOAD_VSR(36, r3) | |
296 | LOAD_VSR(37, r3) | |
297 | LOAD_VSR(38, r3) | |
298 | LOAD_VSR(39, r3) | |
299 | LOAD_VSR(40, r3) | |
300 | LOAD_VSR(41, r3) | |
301 | LOAD_VSR(42, r3) | |
302 | LOAD_VSR(43, r3) | |
303 | LOAD_VSR(44, r3) | |
304 | LOAD_VSR(45, r3) | |
305 | LOAD_VSR(46, r3) | |
306 | LOAD_VSR(47, r3) | |
307 | LOAD_VSR(48, r3) | |
308 | LOAD_VSR(49, r3) | |
309 | LOAD_VSR(50, r3) | |
310 | LOAD_VSR(51, r3) | |
311 | LOAD_VSR(52, r3) | |
312 | LOAD_VSR(53, r3) | |
313 | LOAD_VSR(54, r3) | |
314 | LOAD_VSR(55, r3) | |
315 | LOAD_VSR(56, r3) | |
316 | LOAD_VSR(57, r3) | |
317 | LOAD_VSR(58, r3) | |
318 | LOAD_VSR(59, r3) | |
319 | LOAD_VSR(60, r3) | |
320 | LOAD_VSR(61, r3) | |
321 | LOAD_VSR(62, r3) | |
322 | LOAD_VSR(63, r3) | |
323 | ||
324 | ld r0,XER_SAVE(r1) | |
325 | mtxer r0 | |
326 | ld r0,CTR_SAVE(r1) | |
327 | mtctr r0 | |
328 | ld r0,LR_SAVE(r1) | |
329 | mtlr r0 | |
330 | ld r0,CCR_SAVE(r1) | |
331 | mtcr r0 | |
332 | REST_GPR(0) | |
333 | REST_GPR(2) | |
334 | REST_GPR(3) | |
335 | REST_GPR(4) | |
336 | REST_GPR(5) | |
337 | REST_GPR(6) | |
338 | REST_GPR(7) | |
339 | REST_GPR(8) | |
340 | REST_GPR(9) | |
341 | REST_GPR(10) | |
342 | REST_GPR(11) | |
343 | REST_GPR(12) | |
344 | REST_GPR(13) | |
345 | REST_GPR(14) | |
346 | REST_GPR(15) | |
347 | REST_GPR(16) | |
348 | REST_GPR(17) | |
349 | REST_GPR(18) | |
350 | REST_GPR(19) | |
351 | REST_GPR(20) | |
352 | REST_GPR(21) | |
353 | REST_GPR(22) | |
354 | REST_GPR(23) | |
355 | REST_GPR(24) | |
356 | REST_GPR(25) | |
357 | REST_GPR(26) | |
358 | REST_GPR(27) | |
359 | REST_GPR(28) | |
360 | REST_GPR(29) | |
361 | REST_GPR(30) | |
362 | REST_GPR(31) | |
363 | addi r1,r1,STACK_FRAME | |
364 | RFEBB | |
365 | FUNC_END(ebb_handler) |