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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
e821ea70 | 2 | #include <asm/processor.h> |
14cf11af | 3 | #include <asm/ppc_asm.h> |
b3b8dc6c | 4 | #include <asm/reg.h> |
e821ea70 BH |
5 | #include <asm/asm-offsets.h> |
6 | #include <asm/cputable.h> | |
7 | #include <asm/thread_info.h> | |
8 | #include <asm/page.h> | |
46f52210 | 9 | #include <asm/ptrace.h> |
9445aa1a | 10 | #include <asm/export.h> |
e821ea70 | 11 | |
18461960 PM |
12 | /* |
13 | * Load state from memory into VMX registers including VSCR. | |
14 | * Assumes the caller has enabled VMX in the MSR. | |
15 | */ | |
16 | _GLOBAL(load_vr_state) | |
17 | li r4,VRSTATE_VSCR | |
c2ce6f9f AB |
18 | lvx v0,r4,r3 |
19 | mtvscr v0 | |
18461960 PM |
20 | REST_32VRS(0,r4,r3) |
21 | blr | |
9445aa1a | 22 | EXPORT_SYMBOL(load_vr_state) |
18461960 PM |
23 | |
24 | /* | |
25 | * Store VMX state into memory, including VSCR. | |
26 | * Assumes the caller has enabled VMX in the MSR. | |
27 | */ | |
28 | _GLOBAL(store_vr_state) | |
29 | SAVE_32VRS(0, r4, r3) | |
c2ce6f9f | 30 | mfvscr v0 |
18461960 | 31 | li r4, VRSTATE_VSCR |
c2ce6f9f | 32 | stvx v0, r4, r3 |
18461960 | 33 | blr |
9445aa1a | 34 | EXPORT_SYMBOL(store_vr_state) |
18461960 | 35 | |
e821ea70 | 36 | /* |
e821ea70 BH |
37 | * Disable VMX for the task which had it previously, |
38 | * and save its vector registers in its thread_struct. | |
39 | * Enables the VMX for use in the kernel on return. | |
40 | * On SMP we know the VMX is free, since we give it up every | |
41 | * switch (ie, no lazy save of the vector registers). | |
955c1cab PM |
42 | * |
43 | * Note that on 32-bit this can only use registers that will be | |
44 | * restored by fast_exception_return, i.e. r3 - r6, r10 and r11. | |
e821ea70 BH |
45 | */ |
46 | _GLOBAL(load_up_altivec) | |
47 | mfmsr r5 /* grab the current MSR */ | |
48 | oris r5,r5,MSR_VEC@h | |
49 | MTMSRD(r5) /* enable use of AltiVec now */ | |
50 | isync | |
51 | ||
dd570237 AB |
52 | /* |
53 | * While userspace in general ignores VRSAVE, glibc uses it as a boolean | |
54 | * to optimise userspace context save/restore. Whenever we take an | |
55 | * altivec unavailable exception we must set VRSAVE to something non | |
56 | * zero. Set it to all 1s. See also the programming note in the ISA. | |
e821ea70 BH |
57 | */ |
58 | mfspr r4,SPRN_VRSAVE | |
e090aa80 | 59 | cmpwi 0,r4,0 |
e821ea70 BH |
60 | bne+ 1f |
61 | li r4,-1 | |
62 | mtspr SPRN_VRSAVE,r4 | |
63 | 1: | |
64 | /* enable use of VMX after return */ | |
65 | #ifdef CONFIG_PPC32 | |
ee43eb78 | 66 | mfspr r5,SPRN_SPRG_THREAD /* current task's THREAD (phys) */ |
e821ea70 BH |
67 | oris r9,r9,MSR_VEC@h |
68 | #else | |
69 | ld r4,PACACURRENT(r13) | |
70 | addi r5,r4,THREAD /* Get THREAD */ | |
71 | oris r12,r12,MSR_VEC@h | |
72 | std r12,_MSR(r1) | |
73 | #endif | |
70fe3d98 CB |
74 | /* Don't care if r4 overflows, this is desired behaviour */ |
75 | lbz r4,THREAD_LOAD_VEC(r5) | |
76 | addi r4,r4,1 | |
77 | stb r4,THREAD_LOAD_VEC(r5) | |
955c1cab | 78 | addi r6,r5,THREAD_VRSTATE |
e821ea70 | 79 | li r4,1 |
de79f7b9 | 80 | li r10,VRSTATE_VSCR |
e821ea70 | 81 | stw r4,THREAD_USED_VR(r5) |
c2ce6f9f AB |
82 | lvx v0,r10,r6 |
83 | mtvscr v0 | |
955c1cab | 84 | REST_32VRS(0,r4,r6) |
e821ea70 BH |
85 | /* restore registers and return */ |
86 | blr | |
87 | ||
88 | /* | |
6f515d84 CB |
89 | * save_altivec(tsk) |
90 | * Save the vector registers to its thread_struct | |
e821ea70 | 91 | */ |
6f515d84 | 92 | _GLOBAL(save_altivec) |
e821ea70 | 93 | addi r3,r3,THREAD /* want THREAD of task */ |
18461960 | 94 | PPC_LL r7,THREAD_VRSAVEAREA(r3) |
e821ea70 | 95 | PPC_LL r5,PT_REGS(r3) |
18461960 PM |
96 | PPC_LCMPI 0,r7,0 |
97 | bne 2f | |
98 | addi r7,r3,THREAD_VRSTATE | |
6f515d84 | 99 | 2: SAVE_32VRS(0,r4,r7) |
c2ce6f9f | 100 | mfvscr v0 |
de79f7b9 | 101 | li r4,VRSTATE_VSCR |
c2ce6f9f | 102 | stvx v0,r4,r7 |
e821ea70 BH |
103 | blr |
104 | ||
105 | #ifdef CONFIG_VSX | |
106 | ||
107 | #ifdef CONFIG_PPC32 | |
108 | #error This asm code isn't ready for 32-bit kernels | |
109 | #endif | |
110 | ||
111 | /* | |
112 | * load_up_vsx(unused, unused, tsk) | |
113 | * Disable VSX for the task which had it previously, | |
114 | * and save its vector registers in its thread_struct. | |
115 | * Reuse the fp and vsx saves, but first check to see if they have | |
116 | * been saved already. | |
117 | */ | |
118 | _GLOBAL(load_up_vsx) | |
119 | /* Load FP and VSX registers if they haven't been done yet */ | |
120 | andi. r5,r12,MSR_FP | |
121 | beql+ load_up_fpu /* skip if already loaded */ | |
122 | andis. r5,r12,MSR_VEC@h | |
123 | beql+ load_up_altivec /* skip if already loaded */ | |
124 | ||
e821ea70 BH |
125 | ld r4,PACACURRENT(r13) |
126 | addi r4,r4,THREAD /* Get THREAD */ | |
127 | li r6,1 | |
128 | stw r6,THREAD_USED_VSR(r4) /* ... also set thread used vsr */ | |
129 | /* enable use of VSX after return */ | |
130 | oris r12,r12,MSR_VSX@h | |
131 | std r12,_MSR(r1) | |
e821ea70 BH |
132 | b fast_exception_return |
133 | ||
e821ea70 BH |
134 | #endif /* CONFIG_VSX */ |
135 | ||
14cf11af PM |
136 | |
137 | /* | |
138 | * The routines below are in assembler so we can closely control the | |
139 | * usage of floating-point registers. These routines must be called | |
140 | * with preempt disabled. | |
141 | */ | |
142 | #ifdef CONFIG_PPC32 | |
143 | .data | |
144 | fpzero: | |
145 | .long 0 | |
146 | fpone: | |
147 | .long 0x3f800000 /* 1.0 in single-precision FP */ | |
148 | fphalf: | |
149 | .long 0x3f000000 /* 0.5 in single-precision FP */ | |
150 | ||
151 | #define LDCONST(fr, name) \ | |
152 | lis r11,name@ha; \ | |
153 | lfs fr,name@l(r11) | |
154 | #else | |
155 | ||
156 | .section ".toc","aw" | |
157 | fpzero: | |
158 | .tc FD_0_0[TC],0 | |
159 | fpone: | |
160 | .tc FD_3ff00000_0[TC],0x3ff0000000000000 /* 1.0 */ | |
161 | fphalf: | |
162 | .tc FD_3fe00000_0[TC],0x3fe0000000000000 /* 0.5 */ | |
163 | ||
164 | #define LDCONST(fr, name) \ | |
165 | lfd fr,name@toc(r2) | |
166 | #endif | |
167 | ||
168 | .text | |
169 | /* | |
170 | * Internal routine to enable floating point and set FPSCR to 0. | |
171 | * Don't call it from C; it doesn't use the normal calling convention. | |
172 | */ | |
173 | fpenable: | |
174 | #ifdef CONFIG_PPC32 | |
175 | stwu r1,-64(r1) | |
176 | #else | |
177 | stdu r1,-64(r1) | |
178 | #endif | |
179 | mfmsr r10 | |
180 | ori r11,r10,MSR_FP | |
181 | mtmsr r11 | |
182 | isync | |
183 | stfd fr0,24(r1) | |
184 | stfd fr1,16(r1) | |
185 | stfd fr31,8(r1) | |
186 | LDCONST(fr1, fpzero) | |
187 | mffs fr31 | |
3a2c48cf | 188 | MTFSF_L(fr1) |
14cf11af PM |
189 | blr |
190 | ||
191 | fpdisable: | |
192 | mtlr r12 | |
3a2c48cf | 193 | MTFSF_L(fr31) |
14cf11af PM |
194 | lfd fr31,8(r1) |
195 | lfd fr1,16(r1) | |
196 | lfd fr0,24(r1) | |
197 | mtmsr r10 | |
198 | isync | |
199 | addi r1,r1,64 | |
200 | blr | |
201 | ||
202 | /* | |
203 | * Vector add, floating point. | |
204 | */ | |
205 | _GLOBAL(vaddfp) | |
206 | mflr r12 | |
207 | bl fpenable | |
208 | li r0,4 | |
209 | mtctr r0 | |
210 | li r6,0 | |
211 | 1: lfsx fr0,r4,r6 | |
212 | lfsx fr1,r5,r6 | |
213 | fadds fr0,fr0,fr1 | |
214 | stfsx fr0,r3,r6 | |
215 | addi r6,r6,4 | |
216 | bdnz 1b | |
217 | b fpdisable | |
218 | ||
219 | /* | |
220 | * Vector subtract, floating point. | |
221 | */ | |
222 | _GLOBAL(vsubfp) | |
223 | mflr r12 | |
224 | bl fpenable | |
225 | li r0,4 | |
226 | mtctr r0 | |
227 | li r6,0 | |
228 | 1: lfsx fr0,r4,r6 | |
229 | lfsx fr1,r5,r6 | |
230 | fsubs fr0,fr0,fr1 | |
231 | stfsx fr0,r3,r6 | |
232 | addi r6,r6,4 | |
233 | bdnz 1b | |
234 | b fpdisable | |
235 | ||
236 | /* | |
237 | * Vector multiply and add, floating point. | |
238 | */ | |
239 | _GLOBAL(vmaddfp) | |
240 | mflr r12 | |
241 | bl fpenable | |
242 | stfd fr2,32(r1) | |
243 | li r0,4 | |
244 | mtctr r0 | |
245 | li r7,0 | |
246 | 1: lfsx fr0,r4,r7 | |
247 | lfsx fr1,r5,r7 | |
248 | lfsx fr2,r6,r7 | |
249 | fmadds fr0,fr0,fr2,fr1 | |
250 | stfsx fr0,r3,r7 | |
251 | addi r7,r7,4 | |
252 | bdnz 1b | |
253 | lfd fr2,32(r1) | |
254 | b fpdisable | |
255 | ||
256 | /* | |
257 | * Vector negative multiply and subtract, floating point. | |
258 | */ | |
259 | _GLOBAL(vnmsubfp) | |
260 | mflr r12 | |
261 | bl fpenable | |
262 | stfd fr2,32(r1) | |
263 | li r0,4 | |
264 | mtctr r0 | |
265 | li r7,0 | |
266 | 1: lfsx fr0,r4,r7 | |
267 | lfsx fr1,r5,r7 | |
268 | lfsx fr2,r6,r7 | |
269 | fnmsubs fr0,fr0,fr2,fr1 | |
270 | stfsx fr0,r3,r7 | |
271 | addi r7,r7,4 | |
272 | bdnz 1b | |
273 | lfd fr2,32(r1) | |
274 | b fpdisable | |
275 | ||
276 | /* | |
277 | * Vector reciprocal estimate. We just compute 1.0/x. | |
278 | * r3 -> destination, r4 -> source. | |
279 | */ | |
280 | _GLOBAL(vrefp) | |
281 | mflr r12 | |
282 | bl fpenable | |
283 | li r0,4 | |
284 | LDCONST(fr1, fpone) | |
285 | mtctr r0 | |
286 | li r6,0 | |
287 | 1: lfsx fr0,r4,r6 | |
288 | fdivs fr0,fr1,fr0 | |
289 | stfsx fr0,r3,r6 | |
290 | addi r6,r6,4 | |
291 | bdnz 1b | |
292 | b fpdisable | |
293 | ||
294 | /* | |
295 | * Vector reciprocal square-root estimate, floating point. | |
296 | * We use the frsqrte instruction for the initial estimate followed | |
297 | * by 2 iterations of Newton-Raphson to get sufficient accuracy. | |
298 | * r3 -> destination, r4 -> source. | |
299 | */ | |
300 | _GLOBAL(vrsqrtefp) | |
301 | mflr r12 | |
302 | bl fpenable | |
303 | stfd fr2,32(r1) | |
304 | stfd fr3,40(r1) | |
305 | stfd fr4,48(r1) | |
306 | stfd fr5,56(r1) | |
307 | li r0,4 | |
308 | LDCONST(fr4, fpone) | |
309 | LDCONST(fr5, fphalf) | |
310 | mtctr r0 | |
311 | li r6,0 | |
312 | 1: lfsx fr0,r4,r6 | |
313 | frsqrte fr1,fr0 /* r = frsqrte(s) */ | |
314 | fmuls fr3,fr1,fr0 /* r * s */ | |
315 | fmuls fr2,fr1,fr5 /* r * 0.5 */ | |
316 | fnmsubs fr3,fr1,fr3,fr4 /* 1 - s * r * r */ | |
317 | fmadds fr1,fr2,fr3,fr1 /* r = r + 0.5 * r * (1 - s * r * r) */ | |
318 | fmuls fr3,fr1,fr0 /* r * s */ | |
319 | fmuls fr2,fr1,fr5 /* r * 0.5 */ | |
320 | fnmsubs fr3,fr1,fr3,fr4 /* 1 - s * r * r */ | |
321 | fmadds fr1,fr2,fr3,fr1 /* r = r + 0.5 * r * (1 - s * r * r) */ | |
322 | stfsx fr1,r3,r6 | |
323 | addi r6,r6,4 | |
324 | bdnz 1b | |
325 | lfd fr5,56(r1) | |
326 | lfd fr4,48(r1) | |
327 | lfd fr3,40(r1) | |
328 | lfd fr2,32(r1) | |
329 | b fpdisable |