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1/* SPDX-License-Identifier: GPL-2.0 */
2#include <linux/linkage.h>
3#include <asm/processor.h>
4#include <asm/ppc_asm.h>
5#include <asm/reg.h>
6#include <asm/asm-offsets.h>
7#include <asm/cputable.h>
8#include <asm/thread_info.h>
9#include <asm/page.h>
10#include <asm/ptrace.h>
11#include <asm/export.h>
12#include <asm/asm-compat.h>
13
14/*
15 * Load state from memory into VMX registers including VSCR.
16 * Assumes the caller has enabled VMX in the MSR.
17 */
18_GLOBAL(load_vr_state)
19 li r4,VRSTATE_VSCR
20 lvx v0,r4,r3
21 mtvscr v0
22 REST_32VRS(0,r4,r3)
23 blr
24EXPORT_SYMBOL(load_vr_state)
25_ASM_NOKPROBE_SYMBOL(load_vr_state); /* used by restore_math */
26
27/*
28 * Store VMX state into memory, including VSCR.
29 * Assumes the caller has enabled VMX in the MSR.
30 */
31_GLOBAL(store_vr_state)
32 SAVE_32VRS(0, r4, r3)
33 mfvscr v0
34 li r4, VRSTATE_VSCR
35 stvx v0, r4, r3
36 blr
37EXPORT_SYMBOL(store_vr_state)
38
39/*
40 * Disable VMX for the task which had it previously,
41 * and save its vector registers in its thread_struct.
42 * Enables the VMX for use in the kernel on return.
43 * On SMP we know the VMX is free, since we give it up every
44 * switch (ie, no lazy save of the vector registers).
45 *
46 * Note that on 32-bit this can only use registers that will be
47 * restored by fast_exception_return, i.e. r3 - r6, r10 and r11.
48 */
49_GLOBAL(load_up_altivec)
50 mfmsr r5 /* grab the current MSR */
51#ifdef CONFIG_PPC_BOOK3S_64
52 /* interrupt doesn't set MSR[RI] and HPT can fault on current access */
53 ori r5,r5,MSR_RI
54#endif
55 oris r5,r5,MSR_VEC@h
56 MTMSRD(r5) /* enable use of AltiVec now */
57 isync
58
59 /*
60 * While userspace in general ignores VRSAVE, glibc uses it as a boolean
61 * to optimise userspace context save/restore. Whenever we take an
62 * altivec unavailable exception we must set VRSAVE to something non
63 * zero. Set it to all 1s. See also the programming note in the ISA.
64 */
65 mfspr r4,SPRN_VRSAVE
66 cmpwi 0,r4,0
67 bne+ 1f
68 li r4,-1
69 mtspr SPRN_VRSAVE,r4
701:
71 /* enable use of VMX after return */
72#ifdef CONFIG_PPC32
73 addi r5,r2,THREAD
74 oris r9,r9,MSR_VEC@h
75#else
76 ld r4,PACACURRENT(r13)
77 addi r5,r4,THREAD /* Get THREAD */
78 oris r12,r12,MSR_VEC@h
79 std r12,_MSR(r1)
80#ifdef CONFIG_PPC_BOOK3S_64
81 li r4,0
82 stb r4,PACASRR_VALID(r13)
83#endif
84#endif
85 li r4,1
86 stb r4,THREAD_LOAD_VEC(r5)
87 addi r6,r5,THREAD_VRSTATE
88 li r10,VRSTATE_VSCR
89 stw r4,THREAD_USED_VR(r5)
90 lvx v0,r10,r6
91 mtvscr v0
92 REST_32VRS(0,r4,r6)
93 /* restore registers and return */
94 blr
95_ASM_NOKPROBE_SYMBOL(load_up_altivec)
96
97/*
98 * save_altivec(tsk)
99 * Save the vector registers to its thread_struct
100 */
101_GLOBAL(save_altivec)
102 addi r3,r3,THREAD /* want THREAD of task */
103 PPC_LL r7,THREAD_VRSAVEAREA(r3)
104 PPC_LL r5,PT_REGS(r3)
105 PPC_LCMPI 0,r7,0
106 bne 2f
107 addi r7,r3,THREAD_VRSTATE
1082: SAVE_32VRS(0,r4,r7)
109 mfvscr v0
110 li r4,VRSTATE_VSCR
111 stvx v0,r4,r7
112 blr
113
114#ifdef CONFIG_VSX
115
116#ifdef CONFIG_PPC32
117#error This asm code isn't ready for 32-bit kernels
118#endif
119
120/*
121 * load_up_vsx(unused, unused, tsk)
122 * Disable VSX for the task which had it previously,
123 * and save its vector registers in its thread_struct.
124 * Reuse the fp and vsx saves, but first check to see if they have
125 * been saved already.
126 */
127_GLOBAL(load_up_vsx)
128/* Load FP and VSX registers if they haven't been done yet */
129 andi. r5,r12,MSR_FP
130 beql+ load_up_fpu /* skip if already loaded */
131 andis. r5,r12,MSR_VEC@h
132 beql+ load_up_altivec /* skip if already loaded */
133
134#ifdef CONFIG_PPC_BOOK3S_64
135 /* interrupt doesn't set MSR[RI] and HPT can fault on current access */
136 li r5,MSR_RI
137 mtmsrd r5,1
138#endif
139
140 ld r4,PACACURRENT(r13)
141 addi r4,r4,THREAD /* Get THREAD */
142 li r6,1
143 stw r6,THREAD_USED_VSR(r4) /* ... also set thread used vsr */
144 /* enable use of VSX after return */
145 oris r12,r12,MSR_VSX@h
146 std r12,_MSR(r1)
147 li r4,0
148 stb r4,PACASRR_VALID(r13)
149 b fast_interrupt_return_srr
150
151#endif /* CONFIG_VSX */
152
153
154/*
155 * The routines below are in assembler so we can closely control the
156 * usage of floating-point registers. These routines must be called
157 * with preempt disabled.
158 */
159 .data
160#ifdef CONFIG_PPC32
161fpzero:
162 .long 0
163fpone:
164 .long 0x3f800000 /* 1.0 in single-precision FP */
165fphalf:
166 .long 0x3f000000 /* 0.5 in single-precision FP */
167
168#define LDCONST(fr, name) \
169 lis r11,name@ha; \
170 lfs fr,name@l(r11)
171#else
172
173fpzero:
174 .quad 0
175fpone:
176 .quad 0x3ff0000000000000 /* 1.0 */
177fphalf:
178 .quad 0x3fe0000000000000 /* 0.5 */
179
180#define LDCONST(fr, name) \
181 addis r11,r2,name@toc@ha; \
182 lfd fr,name@toc@l(r11)
183#endif
184 .text
185/*
186 * Internal routine to enable floating point and set FPSCR to 0.
187 * Don't call it from C; it doesn't use the normal calling convention.
188 */
189SYM_FUNC_START_LOCAL(fpenable)
190#ifdef CONFIG_PPC32
191 stwu r1,-64(r1)
192#else
193 stdu r1,-64(r1)
194#endif
195 mfmsr r10
196 ori r11,r10,MSR_FP
197 mtmsr r11
198 isync
199 stfd fr0,24(r1)
200 stfd fr1,16(r1)
201 stfd fr31,8(r1)
202 LDCONST(fr1, fpzero)
203 mffs fr31
204 MTFSF_L(fr1)
205 blr
206SYM_FUNC_END(fpenable)
207
208fpdisable:
209 mtlr r12
210 MTFSF_L(fr31)
211 lfd fr31,8(r1)
212 lfd fr1,16(r1)
213 lfd fr0,24(r1)
214 mtmsr r10
215 isync
216 addi r1,r1,64
217 blr
218
219/*
220 * Vector add, floating point.
221 */
222_GLOBAL(vaddfp)
223 mflr r12
224 bl fpenable
225 li r0,4
226 mtctr r0
227 li r6,0
2281: lfsx fr0,r4,r6
229 lfsx fr1,r5,r6
230 fadds fr0,fr0,fr1
231 stfsx fr0,r3,r6
232 addi r6,r6,4
233 bdnz 1b
234 b fpdisable
235
236/*
237 * Vector subtract, floating point.
238 */
239_GLOBAL(vsubfp)
240 mflr r12
241 bl fpenable
242 li r0,4
243 mtctr r0
244 li r6,0
2451: lfsx fr0,r4,r6
246 lfsx fr1,r5,r6
247 fsubs fr0,fr0,fr1
248 stfsx fr0,r3,r6
249 addi r6,r6,4
250 bdnz 1b
251 b fpdisable
252
253/*
254 * Vector multiply and add, floating point.
255 */
256_GLOBAL(vmaddfp)
257 mflr r12
258 bl fpenable
259 stfd fr2,32(r1)
260 li r0,4
261 mtctr r0
262 li r7,0
2631: lfsx fr0,r4,r7
264 lfsx fr1,r5,r7
265 lfsx fr2,r6,r7
266 fmadds fr0,fr0,fr2,fr1
267 stfsx fr0,r3,r7
268 addi r7,r7,4
269 bdnz 1b
270 lfd fr2,32(r1)
271 b fpdisable
272
273/*
274 * Vector negative multiply and subtract, floating point.
275 */
276_GLOBAL(vnmsubfp)
277 mflr r12
278 bl fpenable
279 stfd fr2,32(r1)
280 li r0,4
281 mtctr r0
282 li r7,0
2831: lfsx fr0,r4,r7
284 lfsx fr1,r5,r7
285 lfsx fr2,r6,r7
286 fnmsubs fr0,fr0,fr2,fr1
287 stfsx fr0,r3,r7
288 addi r7,r7,4
289 bdnz 1b
290 lfd fr2,32(r1)
291 b fpdisable
292
293/*
294 * Vector reciprocal estimate. We just compute 1.0/x.
295 * r3 -> destination, r4 -> source.
296 */
297_GLOBAL(vrefp)
298 mflr r12
299 bl fpenable
300 li r0,4
301 LDCONST(fr1, fpone)
302 mtctr r0
303 li r6,0
3041: lfsx fr0,r4,r6
305 fdivs fr0,fr1,fr0
306 stfsx fr0,r3,r6
307 addi r6,r6,4
308 bdnz 1b
309 b fpdisable
310
311/*
312 * Vector reciprocal square-root estimate, floating point.
313 * We use the frsqrte instruction for the initial estimate followed
314 * by 2 iterations of Newton-Raphson to get sufficient accuracy.
315 * r3 -> destination, r4 -> source.
316 */
317_GLOBAL(vrsqrtefp)
318 mflr r12
319 bl fpenable
320 stfd fr2,32(r1)
321 stfd fr3,40(r1)
322 stfd fr4,48(r1)
323 stfd fr5,56(r1)
324 li r0,4
325 LDCONST(fr4, fpone)
326 LDCONST(fr5, fphalf)
327 mtctr r0
328 li r6,0
3291: lfsx fr0,r4,r6
330 frsqrte fr1,fr0 /* r = frsqrte(s) */
331 fmuls fr3,fr1,fr0 /* r * s */
332 fmuls fr2,fr1,fr5 /* r * 0.5 */
333 fnmsubs fr3,fr1,fr3,fr4 /* 1 - s * r * r */
334 fmadds fr1,fr2,fr3,fr1 /* r = r + 0.5 * r * (1 - s * r * r) */
335 fmuls fr3,fr1,fr0 /* r * s */
336 fmuls fr2,fr1,fr5 /* r * 0.5 */
337 fnmsubs fr3,fr1,fr3,fr4 /* 1 - s * r * r */
338 fmadds fr1,fr2,fr3,fr1 /* r = r + 0.5 * r * (1 - s * r * r) */
339 stfsx fr1,r3,r6
340 addi r6,r6,4
341 bdnz 1b
342 lfd fr5,56(r1)
343 lfd fr4,48(r1)
344 lfd fr3,40(r1)
345 lfd fr2,32(r1)
346 b fpdisable
1/* SPDX-License-Identifier: GPL-2.0 */
2#include <asm/processor.h>
3#include <asm/ppc_asm.h>
4#include <asm/reg.h>
5#include <asm/asm-offsets.h>
6#include <asm/cputable.h>
7#include <asm/thread_info.h>
8#include <asm/page.h>
9#include <asm/ptrace.h>
10#include <asm/export.h>
11#include <asm/asm-compat.h>
12
13/*
14 * Load state from memory into VMX registers including VSCR.
15 * Assumes the caller has enabled VMX in the MSR.
16 */
17_GLOBAL(load_vr_state)
18 li r4,VRSTATE_VSCR
19 lvx v0,r4,r3
20 mtvscr v0
21 REST_32VRS(0,r4,r3)
22 blr
23EXPORT_SYMBOL(load_vr_state)
24_ASM_NOKPROBE_SYMBOL(load_vr_state); /* used by restore_math */
25
26/*
27 * Store VMX state into memory, including VSCR.
28 * Assumes the caller has enabled VMX in the MSR.
29 */
30_GLOBAL(store_vr_state)
31 SAVE_32VRS(0, r4, r3)
32 mfvscr v0
33 li r4, VRSTATE_VSCR
34 stvx v0, r4, r3
35 blr
36EXPORT_SYMBOL(store_vr_state)
37
38/*
39 * Disable VMX for the task which had it previously,
40 * and save its vector registers in its thread_struct.
41 * Enables the VMX for use in the kernel on return.
42 * On SMP we know the VMX is free, since we give it up every
43 * switch (ie, no lazy save of the vector registers).
44 *
45 * Note that on 32-bit this can only use registers that will be
46 * restored by fast_exception_return, i.e. r3 - r6, r10 and r11.
47 */
48_GLOBAL(load_up_altivec)
49 mfmsr r5 /* grab the current MSR */
50 oris r5,r5,MSR_VEC@h
51 MTMSRD(r5) /* enable use of AltiVec now */
52 isync
53
54 /*
55 * While userspace in general ignores VRSAVE, glibc uses it as a boolean
56 * to optimise userspace context save/restore. Whenever we take an
57 * altivec unavailable exception we must set VRSAVE to something non
58 * zero. Set it to all 1s. See also the programming note in the ISA.
59 */
60 mfspr r4,SPRN_VRSAVE
61 cmpwi 0,r4,0
62 bne+ 1f
63 li r4,-1
64 mtspr SPRN_VRSAVE,r4
651:
66 /* enable use of VMX after return */
67#ifdef CONFIG_PPC32
68 mfspr r5,SPRN_SPRG_THREAD /* current task's THREAD (phys) */
69 oris r9,r9,MSR_VEC@h
70#ifdef CONFIG_VMAP_STACK
71 tovirt(r5, r5)
72#endif
73#else
74 ld r4,PACACURRENT(r13)
75 addi r5,r4,THREAD /* Get THREAD */
76 oris r12,r12,MSR_VEC@h
77 std r12,_MSR(r1)
78#endif
79 li r4,1
80 stb r4,THREAD_LOAD_VEC(r5)
81 addi r6,r5,THREAD_VRSTATE
82 li r4,1
83 li r10,VRSTATE_VSCR
84 stw r4,THREAD_USED_VR(r5)
85 lvx v0,r10,r6
86 mtvscr v0
87 REST_32VRS(0,r4,r6)
88 /* restore registers and return */
89 blr
90_ASM_NOKPROBE_SYMBOL(load_up_altivec)
91
92/*
93 * save_altivec(tsk)
94 * Save the vector registers to its thread_struct
95 */
96_GLOBAL(save_altivec)
97 addi r3,r3,THREAD /* want THREAD of task */
98 PPC_LL r7,THREAD_VRSAVEAREA(r3)
99 PPC_LL r5,PT_REGS(r3)
100 PPC_LCMPI 0,r7,0
101 bne 2f
102 addi r7,r3,THREAD_VRSTATE
1032: SAVE_32VRS(0,r4,r7)
104 mfvscr v0
105 li r4,VRSTATE_VSCR
106 stvx v0,r4,r7
107 blr
108
109#ifdef CONFIG_VSX
110
111#ifdef CONFIG_PPC32
112#error This asm code isn't ready for 32-bit kernels
113#endif
114
115/*
116 * load_up_vsx(unused, unused, tsk)
117 * Disable VSX for the task which had it previously,
118 * and save its vector registers in its thread_struct.
119 * Reuse the fp and vsx saves, but first check to see if they have
120 * been saved already.
121 */
122_GLOBAL(load_up_vsx)
123/* Load FP and VSX registers if they haven't been done yet */
124 andi. r5,r12,MSR_FP
125 beql+ load_up_fpu /* skip if already loaded */
126 andis. r5,r12,MSR_VEC@h
127 beql+ load_up_altivec /* skip if already loaded */
128
129 ld r4,PACACURRENT(r13)
130 addi r4,r4,THREAD /* Get THREAD */
131 li r6,1
132 stw r6,THREAD_USED_VSR(r4) /* ... also set thread used vsr */
133 /* enable use of VSX after return */
134 oris r12,r12,MSR_VSX@h
135 std r12,_MSR(r1)
136 b fast_interrupt_return
137
138#endif /* CONFIG_VSX */
139
140
141/*
142 * The routines below are in assembler so we can closely control the
143 * usage of floating-point registers. These routines must be called
144 * with preempt disabled.
145 */
146#ifdef CONFIG_PPC32
147 .data
148fpzero:
149 .long 0
150fpone:
151 .long 0x3f800000 /* 1.0 in single-precision FP */
152fphalf:
153 .long 0x3f000000 /* 0.5 in single-precision FP */
154
155#define LDCONST(fr, name) \
156 lis r11,name@ha; \
157 lfs fr,name@l(r11)
158#else
159
160 .section ".toc","aw"
161fpzero:
162 .tc FD_0_0[TC],0
163fpone:
164 .tc FD_3ff00000_0[TC],0x3ff0000000000000 /* 1.0 */
165fphalf:
166 .tc FD_3fe00000_0[TC],0x3fe0000000000000 /* 0.5 */
167
168#define LDCONST(fr, name) \
169 lfd fr,name@toc(r2)
170#endif
171
172 .text
173/*
174 * Internal routine to enable floating point and set FPSCR to 0.
175 * Don't call it from C; it doesn't use the normal calling convention.
176 */
177fpenable:
178#ifdef CONFIG_PPC32
179 stwu r1,-64(r1)
180#else
181 stdu r1,-64(r1)
182#endif
183 mfmsr r10
184 ori r11,r10,MSR_FP
185 mtmsr r11
186 isync
187 stfd fr0,24(r1)
188 stfd fr1,16(r1)
189 stfd fr31,8(r1)
190 LDCONST(fr1, fpzero)
191 mffs fr31
192 MTFSF_L(fr1)
193 blr
194
195fpdisable:
196 mtlr r12
197 MTFSF_L(fr31)
198 lfd fr31,8(r1)
199 lfd fr1,16(r1)
200 lfd fr0,24(r1)
201 mtmsr r10
202 isync
203 addi r1,r1,64
204 blr
205
206/*
207 * Vector add, floating point.
208 */
209_GLOBAL(vaddfp)
210 mflr r12
211 bl fpenable
212 li r0,4
213 mtctr r0
214 li r6,0
2151: lfsx fr0,r4,r6
216 lfsx fr1,r5,r6
217 fadds fr0,fr0,fr1
218 stfsx fr0,r3,r6
219 addi r6,r6,4
220 bdnz 1b
221 b fpdisable
222
223/*
224 * Vector subtract, floating point.
225 */
226_GLOBAL(vsubfp)
227 mflr r12
228 bl fpenable
229 li r0,4
230 mtctr r0
231 li r6,0
2321: lfsx fr0,r4,r6
233 lfsx fr1,r5,r6
234 fsubs fr0,fr0,fr1
235 stfsx fr0,r3,r6
236 addi r6,r6,4
237 bdnz 1b
238 b fpdisable
239
240/*
241 * Vector multiply and add, floating point.
242 */
243_GLOBAL(vmaddfp)
244 mflr r12
245 bl fpenable
246 stfd fr2,32(r1)
247 li r0,4
248 mtctr r0
249 li r7,0
2501: lfsx fr0,r4,r7
251 lfsx fr1,r5,r7
252 lfsx fr2,r6,r7
253 fmadds fr0,fr0,fr2,fr1
254 stfsx fr0,r3,r7
255 addi r7,r7,4
256 bdnz 1b
257 lfd fr2,32(r1)
258 b fpdisable
259
260/*
261 * Vector negative multiply and subtract, floating point.
262 */
263_GLOBAL(vnmsubfp)
264 mflr r12
265 bl fpenable
266 stfd fr2,32(r1)
267 li r0,4
268 mtctr r0
269 li r7,0
2701: lfsx fr0,r4,r7
271 lfsx fr1,r5,r7
272 lfsx fr2,r6,r7
273 fnmsubs fr0,fr0,fr2,fr1
274 stfsx fr0,r3,r7
275 addi r7,r7,4
276 bdnz 1b
277 lfd fr2,32(r1)
278 b fpdisable
279
280/*
281 * Vector reciprocal estimate. We just compute 1.0/x.
282 * r3 -> destination, r4 -> source.
283 */
284_GLOBAL(vrefp)
285 mflr r12
286 bl fpenable
287 li r0,4
288 LDCONST(fr1, fpone)
289 mtctr r0
290 li r6,0
2911: lfsx fr0,r4,r6
292 fdivs fr0,fr1,fr0
293 stfsx fr0,r3,r6
294 addi r6,r6,4
295 bdnz 1b
296 b fpdisable
297
298/*
299 * Vector reciprocal square-root estimate, floating point.
300 * We use the frsqrte instruction for the initial estimate followed
301 * by 2 iterations of Newton-Raphson to get sufficient accuracy.
302 * r3 -> destination, r4 -> source.
303 */
304_GLOBAL(vrsqrtefp)
305 mflr r12
306 bl fpenable
307 stfd fr2,32(r1)
308 stfd fr3,40(r1)
309 stfd fr4,48(r1)
310 stfd fr5,56(r1)
311 li r0,4
312 LDCONST(fr4, fpone)
313 LDCONST(fr5, fphalf)
314 mtctr r0
315 li r6,0
3161: lfsx fr0,r4,r6
317 frsqrte fr1,fr0 /* r = frsqrte(s) */
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 fmuls fr3,fr1,fr0 /* r * s */
323 fmuls fr2,fr1,fr5 /* r * 0.5 */
324 fnmsubs fr3,fr1,fr3,fr4 /* 1 - s * r * r */
325 fmadds fr1,fr2,fr3,fr1 /* r = r + 0.5 * r * (1 - s * r * r) */
326 stfsx fr1,r3,r6
327 addi r6,r6,4
328 bdnz 1b
329 lfd fr5,56(r1)
330 lfd fr4,48(r1)
331 lfd fr3,40(r1)
332 lfd fr2,32(r1)
333 b fpdisable