1/* SPDX-License-Identifier: GPL-2.0 */
  2#include <linux/export.h>
  3#include <linux/linkage.h>
  4#include <asm/processor.h>
  5#include <asm/ppc_asm.h>
  6#include <asm/reg.h>
  7#include <asm/asm-offsets.h>
  8#include <asm/cputable.h>
  9#include <asm/thread_info.h>
 10#include <asm/page.h>
 11#include <asm/ptrace.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	lvx	v0, 0, r3
 37	blr
 38EXPORT_SYMBOL(store_vr_state)
 39
 40/*
 41 * Disable VMX for the task which had it previously,
 42 * and save its vector registers in its thread_struct.
 43 * Enables the VMX for use in the kernel on return.
 44 * On SMP we know the VMX is free, since we give it up every
 45 * switch (ie, no lazy save of the vector registers).
 46 *
 47 * Note that on 32-bit this can only use registers that will be
 48 * restored by fast_exception_return, i.e. r3 - r6, r10 and r11.
 49 */
 50_GLOBAL(load_up_altivec)
 51	mfmsr	r5			/* grab the current MSR */
 52#ifdef CONFIG_PPC_BOOK3S_64
 53	/* interrupt doesn't set MSR[RI] and HPT can fault on current access */
 54	ori	r5,r5,MSR_RI
 55#endif
 56	oris	r5,r5,MSR_VEC@h
 57	MTMSRD(r5)			/* enable use of AltiVec now */
 58	isync
 59
 60	/*
 61	 * While userspace in general ignores VRSAVE, glibc uses it as a boolean
 62	 * to optimise userspace context save/restore. Whenever we take an
 63	 * altivec unavailable exception we must set VRSAVE to something non
 64	 * zero. Set it to all 1s. See also the programming note in the ISA.
 65	 */
 66	mfspr	r4,SPRN_VRSAVE
 67	cmpwi	0,r4,0
 68	bne+	1f
 69	li	r4,-1
 70	mtspr	SPRN_VRSAVE,r4
 711:
 72	/* enable use of VMX after return */
 73#ifdef CONFIG_PPC32
 74	addi	r5,r2,THREAD
 75	oris	r9,r9,MSR_VEC@h
 76#else
 77	ld	r4,PACACURRENT(r13)
 78	addi	r5,r4,THREAD		/* Get THREAD */
 79	oris	r12,r12,MSR_VEC@h
 80	std	r12,_MSR(r1)
 81#ifdef CONFIG_PPC_BOOK3S_64
 82	li	r4,0
 83	stb	r4,PACASRR_VALID(r13)
 84#endif
 85#endif
 86	li	r4,1
 
 
 87	stb	r4,THREAD_LOAD_VEC(r5)
 88	addi	r6,r5,THREAD_VRSTATE
 
 89	li	r10,VRSTATE_VSCR
 90	stw	r4,THREAD_USED_VR(r5)
 91	lvx	v0,r10,r6
 92	mtvscr	v0
 93	REST_32VRS(0,r4,r6)
 94	/* restore registers and return */
 95	blr
 96_ASM_NOKPROBE_SYMBOL(load_up_altivec)
 97
 98/*
 99 * save_altivec(tsk)
100 * Save the vector registers to its thread_struct
101 */
102_GLOBAL(save_altivec)
103	addi	r3,r3,THREAD		/* want THREAD of task */
104	PPC_LL	r7,THREAD_VRSAVEAREA(r3)
105	PPC_LL	r5,PT_REGS(r3)
106	PPC_LCMPI	0,r7,0
107	bne	2f
108	addi	r7,r3,THREAD_VRSTATE
1092:	SAVE_32VRS(0,r4,r7)
110	mfvscr	v0
111	li	r4,VRSTATE_VSCR
112	stvx	v0,r4,r7
113	lvx	v0,0,r7
114	blr
115
116#ifdef CONFIG_VSX
117
118#ifdef CONFIG_PPC32
119#error This asm code isn't ready for 32-bit kernels
120#endif
121
122/*
123 * load_up_vsx(unused, unused, tsk)
124 * Disable VSX for the task which had it previously,
125 * and save its vector registers in its thread_struct.
126 * Reuse the fp and vsx saves, but first check to see if they have
127 * been saved already.
128 */
129_GLOBAL(load_up_vsx)
130/* Load FP and VSX registers if they haven't been done yet */
131	andi.	r5,r12,MSR_FP
132	beql+	load_up_fpu		/* skip if already loaded */
133	andis.	r5,r12,MSR_VEC@h
134	beql+	load_up_altivec		/* skip if already loaded */
135
136#ifdef CONFIG_PPC_BOOK3S_64
137	/* interrupt doesn't set MSR[RI] and HPT can fault on current access */
138	li	r5,MSR_RI
139	mtmsrd	r5,1
140#endif
141
142	ld	r4,PACACURRENT(r13)
143	addi	r4,r4,THREAD		/* Get THREAD */
144	li	r6,1
145	stw	r6,THREAD_USED_VSR(r4) /* ... also set thread used vsr */
146	/* enable use of VSX after return */
147	oris	r12,r12,MSR_VSX@h
148	std	r12,_MSR(r1)
149	li	r4,0
150	stb	r4,PACASRR_VALID(r13)
151	b	fast_interrupt_return_srr
152
153#endif /* CONFIG_VSX */
154
155
156/*
157 * The routines below are in assembler so we can closely control the
158 * usage of floating-point registers.  These routines must be called
159 * with preempt disabled.
160 */
161	.data
162#ifdef CONFIG_PPC32
 
163fpzero:
164	.long	0
165fpone:
166	.long	0x3f800000	/* 1.0 in single-precision FP */
167fphalf:
168	.long	0x3f000000	/* 0.5 in single-precision FP */
169
170#define LDCONST(fr, name)	\
171	lis	r11,name@ha;	\
172	lfs	fr,name@l(r11)
173#else
174
 
175fpzero:
176	.quad	0
177fpone:
178	.quad	0x3ff0000000000000	/* 1.0 */
179fphalf:
180	.quad	0x3fe0000000000000	/* 0.5 */
181
182#ifdef CONFIG_PPC_KERNEL_PCREL
183#define LDCONST(fr, name)		\
184	pla	r11,name@pcrel;		\
185	lfd	fr,0(r11)
186#else
187#define LDCONST(fr, name)		\
188	addis	r11,r2,name@toc@ha;	\
189	lfd	fr,name@toc@l(r11)
190#endif
191#endif
 
192	.text
193/*
194 * Internal routine to enable floating point and set FPSCR to 0.
195 * Don't call it from C; it doesn't use the normal calling convention.
196 */
197SYM_FUNC_START_LOCAL(fpenable)
198#ifdef CONFIG_PPC32
199	stwu	r1,-64(r1)
200#else
201	stdu	r1,-64(r1)
202#endif
203	mfmsr	r10
204	ori	r11,r10,MSR_FP
205	mtmsr	r11
206	isync
207	stfd	fr0,24(r1)
208	stfd	fr1,16(r1)
209	stfd	fr31,8(r1)
210	LDCONST(fr1, fpzero)
211	mffs	fr31
212	MTFSF_L(fr1)
213	blr
214SYM_FUNC_END(fpenable)
215
216fpdisable:
217	mtlr	r12
218	MTFSF_L(fr31)
219	lfd	fr31,8(r1)
220	lfd	fr1,16(r1)
221	lfd	fr0,24(r1)
222	mtmsr	r10
223	isync
224	addi	r1,r1,64
225	blr
226
227/*
228 * Vector add, floating point.
229 */
230_GLOBAL(vaddfp)
231	mflr	r12
232	bl	fpenable
233	li	r0,4
234	mtctr	r0
235	li	r6,0
2361:	lfsx	fr0,r4,r6
237	lfsx	fr1,r5,r6
238	fadds	fr0,fr0,fr1
239	stfsx	fr0,r3,r6
240	addi	r6,r6,4
241	bdnz	1b
242	b	fpdisable
243
244/*
245 * Vector subtract, floating point.
246 */
247_GLOBAL(vsubfp)
248	mflr	r12
249	bl	fpenable
250	li	r0,4
251	mtctr	r0
252	li	r6,0
2531:	lfsx	fr0,r4,r6
254	lfsx	fr1,r5,r6
255	fsubs	fr0,fr0,fr1
256	stfsx	fr0,r3,r6
257	addi	r6,r6,4
258	bdnz	1b
259	b	fpdisable
260
261/*
262 * Vector multiply and add, floating point.
263 */
264_GLOBAL(vmaddfp)
265	mflr	r12
266	bl	fpenable
267	stfd	fr2,32(r1)
268	li	r0,4
269	mtctr	r0
270	li	r7,0
2711:	lfsx	fr0,r4,r7
272	lfsx	fr1,r5,r7
273	lfsx	fr2,r6,r7
274	fmadds	fr0,fr0,fr2,fr1
275	stfsx	fr0,r3,r7
276	addi	r7,r7,4
277	bdnz	1b
278	lfd	fr2,32(r1)
279	b	fpdisable
280
281/*
282 * Vector negative multiply and subtract, floating point.
283 */
284_GLOBAL(vnmsubfp)
285	mflr	r12
286	bl	fpenable
287	stfd	fr2,32(r1)
288	li	r0,4
289	mtctr	r0
290	li	r7,0
2911:	lfsx	fr0,r4,r7
292	lfsx	fr1,r5,r7
293	lfsx	fr2,r6,r7
294	fnmsubs	fr0,fr0,fr2,fr1
295	stfsx	fr0,r3,r7
296	addi	r7,r7,4
297	bdnz	1b
298	lfd	fr2,32(r1)
299	b	fpdisable
300
301/*
302 * Vector reciprocal estimate.  We just compute 1.0/x.
303 * r3 -> destination, r4 -> source.
304 */
305_GLOBAL(vrefp)
306	mflr	r12
307	bl	fpenable
308	li	r0,4
309	LDCONST(fr1, fpone)
310	mtctr	r0
311	li	r6,0
3121:	lfsx	fr0,r4,r6
313	fdivs	fr0,fr1,fr0
314	stfsx	fr0,r3,r6
315	addi	r6,r6,4
316	bdnz	1b
317	b	fpdisable
318
319/*
320 * Vector reciprocal square-root estimate, floating point.
321 * We use the frsqrte instruction for the initial estimate followed
322 * by 2 iterations of Newton-Raphson to get sufficient accuracy.
323 * r3 -> destination, r4 -> source.
324 */
325_GLOBAL(vrsqrtefp)
326	mflr	r12
327	bl	fpenable
328	stfd	fr2,32(r1)
329	stfd	fr3,40(r1)
330	stfd	fr4,48(r1)
331	stfd	fr5,56(r1)
332	li	r0,4
333	LDCONST(fr4, fpone)
334	LDCONST(fr5, fphalf)
335	mtctr	r0
336	li	r6,0
3371:	lfsx	fr0,r4,r6
338	frsqrte	fr1,fr0		/* r = frsqrte(s) */
339	fmuls	fr3,fr1,fr0	/* r * s */
340	fmuls	fr2,fr1,fr5	/* r * 0.5 */
341	fnmsubs	fr3,fr1,fr3,fr4	/* 1 - s * r * r */
342	fmadds	fr1,fr2,fr3,fr1	/* r = r + 0.5 * r * (1 - s * r * r) */
343	fmuls	fr3,fr1,fr0	/* r * s */
344	fmuls	fr2,fr1,fr5	/* r * 0.5 */
345	fnmsubs	fr3,fr1,fr3,fr4	/* 1 - s * r * r */
346	fmadds	fr1,fr2,fr3,fr1	/* r = r + 0.5 * r * (1 - s * r * r) */
347	stfsx	fr1,r3,r6
348	addi	r6,r6,4
349	bdnz	1b
350	lfd	fr5,56(r1)
351	lfd	fr4,48(r1)
352	lfd	fr3,40(r1)
353	lfd	fr2,32(r1)
354	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#else
 71	ld	r4,PACACURRENT(r13)
 72	addi	r5,r4,THREAD		/* Get THREAD */
 73	oris	r12,r12,MSR_VEC@h
 74	std	r12,_MSR(r1)
 
 
 
 
 75#endif
 76	/* Don't care if r4 overflows, this is desired behaviour */
 77	lbz	r4,THREAD_LOAD_VEC(r5)
 78	addi	r4,r4,1
 79	stb	r4,THREAD_LOAD_VEC(r5)
 80	addi	r6,r5,THREAD_VRSTATE
 81	li	r4,1
 82	li	r10,VRSTATE_VSCR
 83	stw	r4,THREAD_USED_VR(r5)
 84	lvx	v0,r10,r6
 85	mtvscr	v0
 86	REST_32VRS(0,r4,r6)
 87	/* restore registers and return */
 88	blr
 
 89
 90/*
 91 * save_altivec(tsk)
 92 * Save the vector registers to its thread_struct
 93 */
 94_GLOBAL(save_altivec)
 95	addi	r3,r3,THREAD		/* want THREAD of task */
 96	PPC_LL	r7,THREAD_VRSAVEAREA(r3)
 97	PPC_LL	r5,PT_REGS(r3)
 98	PPC_LCMPI	0,r7,0
 99	bne	2f
100	addi	r7,r3,THREAD_VRSTATE
1012:	SAVE_32VRS(0,r4,r7)
102	mfvscr	v0
103	li	r4,VRSTATE_VSCR
104	stvx	v0,r4,r7
 
105	blr
106
107#ifdef CONFIG_VSX
108
109#ifdef CONFIG_PPC32
110#error This asm code isn't ready for 32-bit kernels
111#endif
112
113/*
114 * load_up_vsx(unused, unused, tsk)
115 * Disable VSX for the task which had it previously,
116 * and save its vector registers in its thread_struct.
117 * Reuse the fp and vsx saves, but first check to see if they have
118 * been saved already.
119 */
120_GLOBAL(load_up_vsx)
121/* Load FP and VSX registers if they haven't been done yet */
122	andi.	r5,r12,MSR_FP
123	beql+	load_up_fpu		/* skip if already loaded */
124	andis.	r5,r12,MSR_VEC@h
125	beql+	load_up_altivec		/* skip if already loaded */
126
 
 
 
 
 
 
127	ld	r4,PACACURRENT(r13)
128	addi	r4,r4,THREAD		/* Get THREAD */
129	li	r6,1
130	stw	r6,THREAD_USED_VSR(r4) /* ... also set thread used vsr */
131	/* enable use of VSX after return */
132	oris	r12,r12,MSR_VSX@h
133	std	r12,_MSR(r1)
134	b	fast_exception_return
 
 
135
136#endif /* CONFIG_VSX */
137
138
139/*
140 * The routines below are in assembler so we can closely control the
141 * usage of floating-point registers.  These routines must be called
142 * with preempt disabled.
143 */
 
144#ifdef CONFIG_PPC32
145	.data
146fpzero:
147	.long	0
148fpone:
149	.long	0x3f800000	/* 1.0 in single-precision FP */
150fphalf:
151	.long	0x3f000000	/* 0.5 in single-precision FP */
152
153#define LDCONST(fr, name)	\
154	lis	r11,name@ha;	\
155	lfs	fr,name@l(r11)
156#else
157
158	.section ".toc","aw"
159fpzero:
160	.tc	FD_0_0[TC],0
161fpone:
162	.tc	FD_3ff00000_0[TC],0x3ff0000000000000	/* 1.0 */
163fphalf:
164	.tc	FD_3fe00000_0[TC],0x3fe0000000000000	/* 0.5 */
165
166#define LDCONST(fr, name)	\
167	lfd	fr,name@toc(r2)
 
 
 
 
 
 
 
168#endif
169
170	.text
171/*
172 * Internal routine to enable floating point and set FPSCR to 0.
173 * Don't call it from C; it doesn't use the normal calling convention.
174 */
175fpenable:
176#ifdef CONFIG_PPC32
177	stwu	r1,-64(r1)
178#else
179	stdu	r1,-64(r1)
180#endif
181	mfmsr	r10
182	ori	r11,r10,MSR_FP
183	mtmsr	r11
184	isync
185	stfd	fr0,24(r1)
186	stfd	fr1,16(r1)
187	stfd	fr31,8(r1)
188	LDCONST(fr1, fpzero)
189	mffs	fr31
190	MTFSF_L(fr1)
191	blr
 
192
193fpdisable:
194	mtlr	r12
195	MTFSF_L(fr31)
196	lfd	fr31,8(r1)
197	lfd	fr1,16(r1)
198	lfd	fr0,24(r1)
199	mtmsr	r10
200	isync
201	addi	r1,r1,64
202	blr
203
204/*
205 * Vector add, floating point.
206 */
207_GLOBAL(vaddfp)
208	mflr	r12
209	bl	fpenable
210	li	r0,4
211	mtctr	r0
212	li	r6,0
2131:	lfsx	fr0,r4,r6
214	lfsx	fr1,r5,r6
215	fadds	fr0,fr0,fr1
216	stfsx	fr0,r3,r6
217	addi	r6,r6,4
218	bdnz	1b
219	b	fpdisable
220
221/*
222 * Vector subtract, floating point.
223 */
224_GLOBAL(vsubfp)
225	mflr	r12
226	bl	fpenable
227	li	r0,4
228	mtctr	r0
229	li	r6,0
2301:	lfsx	fr0,r4,r6
231	lfsx	fr1,r5,r6
232	fsubs	fr0,fr0,fr1
233	stfsx	fr0,r3,r6
234	addi	r6,r6,4
235	bdnz	1b
236	b	fpdisable
237
238/*
239 * Vector multiply and add, floating point.
240 */
241_GLOBAL(vmaddfp)
242	mflr	r12
243	bl	fpenable
244	stfd	fr2,32(r1)
245	li	r0,4
246	mtctr	r0
247	li	r7,0
2481:	lfsx	fr0,r4,r7
249	lfsx	fr1,r5,r7
250	lfsx	fr2,r6,r7
251	fmadds	fr0,fr0,fr2,fr1
252	stfsx	fr0,r3,r7
253	addi	r7,r7,4
254	bdnz	1b
255	lfd	fr2,32(r1)
256	b	fpdisable
257
258/*
259 * Vector negative multiply and subtract, floating point.
260 */
261_GLOBAL(vnmsubfp)
262	mflr	r12
263	bl	fpenable
264	stfd	fr2,32(r1)
265	li	r0,4
266	mtctr	r0
267	li	r7,0
2681:	lfsx	fr0,r4,r7
269	lfsx	fr1,r5,r7
270	lfsx	fr2,r6,r7
271	fnmsubs	fr0,fr0,fr2,fr1
272	stfsx	fr0,r3,r7
273	addi	r7,r7,4
274	bdnz	1b
275	lfd	fr2,32(r1)
276	b	fpdisable
277
278/*
279 * Vector reciprocal estimate.  We just compute 1.0/x.
280 * r3 -> destination, r4 -> source.
281 */
282_GLOBAL(vrefp)
283	mflr	r12
284	bl	fpenable
285	li	r0,4
286	LDCONST(fr1, fpone)
287	mtctr	r0
288	li	r6,0
2891:	lfsx	fr0,r4,r6
290	fdivs	fr0,fr1,fr0
291	stfsx	fr0,r3,r6
292	addi	r6,r6,4
293	bdnz	1b
294	b	fpdisable
295
296/*
297 * Vector reciprocal square-root estimate, floating point.
298 * We use the frsqrte instruction for the initial estimate followed
299 * by 2 iterations of Newton-Raphson to get sufficient accuracy.
300 * r3 -> destination, r4 -> source.
301 */
302_GLOBAL(vrsqrtefp)
303	mflr	r12
304	bl	fpenable
305	stfd	fr2,32(r1)
306	stfd	fr3,40(r1)
307	stfd	fr4,48(r1)
308	stfd	fr5,56(r1)
309	li	r0,4
310	LDCONST(fr4, fpone)
311	LDCONST(fr5, fphalf)
312	mtctr	r0
313	li	r6,0
3141:	lfsx	fr0,r4,r6
315	frsqrte	fr1,fr0		/* r = frsqrte(s) */
316	fmuls	fr3,fr1,fr0	/* r * s */
317	fmuls	fr2,fr1,fr5	/* r * 0.5 */
318	fnmsubs	fr3,fr1,fr3,fr4	/* 1 - s * r * r */
319	fmadds	fr1,fr2,fr3,fr1	/* r = r + 0.5 * r * (1 - s * r * r) */
320	fmuls	fr3,fr1,fr0	/* r * s */
321	fmuls	fr2,fr1,fr5	/* r * 0.5 */
322	fnmsubs	fr3,fr1,fr3,fr4	/* 1 - s * r * r */
323	fmadds	fr1,fr2,fr3,fr1	/* r = r + 0.5 * r * (1 - s * r * r) */
324	stfsx	fr1,r3,r6
325	addi	r6,r6,4
326	bdnz	1b
327	lfd	fr5,56(r1)
328	lfd	fr4,48(r1)
329	lfd	fr3,40(r1)
330	lfd	fr2,32(r1)
331	b	fpdisable