| /* SPDX-License-Identifier: GPL-2.0 */ |
| #include <linux/export.h> |
| #include <linux/linkage.h> |
| #include <asm/processor.h> |
| #include <asm/ppc_asm.h> |
| #include <asm/reg.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/cputable.h> |
| #include <asm/thread_info.h> |
| #include <asm/page.h> |
| #include <asm/ptrace.h> |
| #include <asm/asm-compat.h> |
| |
| /* |
| * Load state from memory into VMX registers including VSCR. |
| * Assumes the caller has enabled VMX in the MSR. |
| */ |
| _GLOBAL(load_vr_state) |
| li r4,VRSTATE_VSCR |
| lvx v0,r4,r3 |
| mtvscr v0 |
| REST_32VRS(0,r4,r3) |
| blr |
| EXPORT_SYMBOL(load_vr_state) |
| _ASM_NOKPROBE_SYMBOL(load_vr_state); /* used by restore_math */ |
| |
| /* |
| * Store VMX state into memory, including VSCR. |
| * Assumes the caller has enabled VMX in the MSR. |
| */ |
| _GLOBAL(store_vr_state) |
| SAVE_32VRS(0, r4, r3) |
| mfvscr v0 |
| li r4, VRSTATE_VSCR |
| stvx v0, r4, r3 |
| lvx v0, 0, r3 |
| blr |
| EXPORT_SYMBOL(store_vr_state) |
| |
| /* |
| * Disable VMX for the task which had it previously, |
| * and save its vector registers in its thread_struct. |
| * Enables the VMX for use in the kernel on return. |
| * On SMP we know the VMX is free, since we give it up every |
| * switch (ie, no lazy save of the vector registers). |
| * |
| * Note that on 32-bit this can only use registers that will be |
| * restored by fast_exception_return, i.e. r3 - r6, r10 and r11. |
| */ |
| _GLOBAL(load_up_altivec) |
| mfmsr r5 /* grab the current MSR */ |
| #ifdef CONFIG_PPC_BOOK3S_64 |
| /* interrupt doesn't set MSR[RI] and HPT can fault on current access */ |
| ori r5,r5,MSR_RI |
| #endif |
| oris r5,r5,MSR_VEC@h |
| MTMSRD(r5) /* enable use of AltiVec now */ |
| isync |
| |
| /* |
| * While userspace in general ignores VRSAVE, glibc uses it as a boolean |
| * to optimise userspace context save/restore. Whenever we take an |
| * altivec unavailable exception we must set VRSAVE to something non |
| * zero. Set it to all 1s. See also the programming note in the ISA. |
| */ |
| mfspr r4,SPRN_VRSAVE |
| cmpwi 0,r4,0 |
| bne+ 1f |
| li r4,-1 |
| mtspr SPRN_VRSAVE,r4 |
| 1: |
| /* enable use of VMX after return */ |
| #ifdef CONFIG_PPC32 |
| addi r5,r2,THREAD |
| oris r9,r9,MSR_VEC@h |
| #else |
| ld r4,PACACURRENT(r13) |
| addi r5,r4,THREAD /* Get THREAD */ |
| oris r12,r12,MSR_VEC@h |
| std r12,_MSR(r1) |
| #ifdef CONFIG_PPC_BOOK3S_64 |
| li r4,0 |
| stb r4,PACASRR_VALID(r13) |
| #endif |
| #endif |
| li r4,1 |
| stb r4,THREAD_LOAD_VEC(r5) |
| addi r6,r5,THREAD_VRSTATE |
| li r10,VRSTATE_VSCR |
| stw r4,THREAD_USED_VR(r5) |
| lvx v0,r10,r6 |
| mtvscr v0 |
| REST_32VRS(0,r4,r6) |
| /* restore registers and return */ |
| blr |
| _ASM_NOKPROBE_SYMBOL(load_up_altivec) |
| |
| /* |
| * save_altivec(tsk) |
| * Save the vector registers to its thread_struct |
| */ |
| _GLOBAL(save_altivec) |
| addi r3,r3,THREAD /* want THREAD of task */ |
| PPC_LL r7,THREAD_VRSAVEAREA(r3) |
| PPC_LL r5,PT_REGS(r3) |
| PPC_LCMPI 0,r7,0 |
| bne 2f |
| addi r7,r3,THREAD_VRSTATE |
| 2: SAVE_32VRS(0,r4,r7) |
| mfvscr v0 |
| li r4,VRSTATE_VSCR |
| stvx v0,r4,r7 |
| lvx v0,0,r7 |
| blr |
| |
| #ifdef CONFIG_VSX |
| |
| #ifdef CONFIG_PPC32 |
| #error This asm code isn't ready for 32-bit kernels |
| #endif |
| |
| /* |
| * load_up_vsx(unused, unused, tsk) |
| * Disable VSX for the task which had it previously, |
| * and save its vector registers in its thread_struct. |
| * Reuse the fp and vsx saves, but first check to see if they have |
| * been saved already. |
| */ |
| _GLOBAL(load_up_vsx) |
| /* Load FP and VSX registers if they haven't been done yet */ |
| andi. r5,r12,MSR_FP |
| beql+ load_up_fpu /* skip if already loaded */ |
| andis. r5,r12,MSR_VEC@h |
| beql+ load_up_altivec /* skip if already loaded */ |
| |
| #ifdef CONFIG_PPC_BOOK3S_64 |
| /* interrupt doesn't set MSR[RI] and HPT can fault on current access */ |
| li r5,MSR_RI |
| mtmsrd r5,1 |
| #endif |
| |
| ld r4,PACACURRENT(r13) |
| addi r4,r4,THREAD /* Get THREAD */ |
| li r6,1 |
| stw r6,THREAD_USED_VSR(r4) /* ... also set thread used vsr */ |
| /* enable use of VSX after return */ |
| oris r12,r12,MSR_VSX@h |
| std r12,_MSR(r1) |
| li r4,0 |
| stb r4,PACASRR_VALID(r13) |
| b fast_interrupt_return_srr |
| |
| #endif /* CONFIG_VSX */ |
| |
| |
| /* |
| * The routines below are in assembler so we can closely control the |
| * usage of floating-point registers. These routines must be called |
| * with preempt disabled. |
| */ |
| .data |
| #ifdef CONFIG_PPC32 |
| fpzero: |
| .long 0 |
| fpone: |
| .long 0x3f800000 /* 1.0 in single-precision FP */ |
| fphalf: |
| .long 0x3f000000 /* 0.5 in single-precision FP */ |
| |
| #define LDCONST(fr, name) \ |
| lis r11,name@ha; \ |
| lfs fr,name@l(r11) |
| #else |
| |
| fpzero: |
| .quad 0 |
| fpone: |
| .quad 0x3ff0000000000000 /* 1.0 */ |
| fphalf: |
| .quad 0x3fe0000000000000 /* 0.5 */ |
| |
| #ifdef CONFIG_PPC_KERNEL_PCREL |
| #define LDCONST(fr, name) \ |
| pla r11,name@pcrel; \ |
| lfd fr,0(r11) |
| #else |
| #define LDCONST(fr, name) \ |
| addis r11,r2,name@toc@ha; \ |
| lfd fr,name@toc@l(r11) |
| #endif |
| #endif |
| .text |
| /* |
| * Internal routine to enable floating point and set FPSCR to 0. |
| * Don't call it from C; it doesn't use the normal calling convention. |
| */ |
| SYM_FUNC_START_LOCAL(fpenable) |
| #ifdef CONFIG_PPC32 |
| stwu r1,-64(r1) |
| #else |
| stdu r1,-64(r1) |
| #endif |
| mfmsr r10 |
| ori r11,r10,MSR_FP |
| mtmsr r11 |
| isync |
| stfd fr0,24(r1) |
| stfd fr1,16(r1) |
| stfd fr31,8(r1) |
| LDCONST(fr1, fpzero) |
| mffs fr31 |
| MTFSF_L(fr1) |
| blr |
| SYM_FUNC_END(fpenable) |
| |
| fpdisable: |
| mtlr r12 |
| MTFSF_L(fr31) |
| lfd fr31,8(r1) |
| lfd fr1,16(r1) |
| lfd fr0,24(r1) |
| mtmsr r10 |
| isync |
| addi r1,r1,64 |
| blr |
| |
| /* |
| * Vector add, floating point. |
| */ |
| _GLOBAL(vaddfp) |
| mflr r12 |
| bl fpenable |
| li r0,4 |
| mtctr r0 |
| li r6,0 |
| 1: lfsx fr0,r4,r6 |
| lfsx fr1,r5,r6 |
| fadds fr0,fr0,fr1 |
| stfsx fr0,r3,r6 |
| addi r6,r6,4 |
| bdnz 1b |
| b fpdisable |
| |
| /* |
| * Vector subtract, floating point. |
| */ |
| _GLOBAL(vsubfp) |
| mflr r12 |
| bl fpenable |
| li r0,4 |
| mtctr r0 |
| li r6,0 |
| 1: lfsx fr0,r4,r6 |
| lfsx fr1,r5,r6 |
| fsubs fr0,fr0,fr1 |
| stfsx fr0,r3,r6 |
| addi r6,r6,4 |
| bdnz 1b |
| b fpdisable |
| |
| /* |
| * Vector multiply and add, floating point. |
| */ |
| _GLOBAL(vmaddfp) |
| mflr r12 |
| bl fpenable |
| stfd fr2,32(r1) |
| li r0,4 |
| mtctr r0 |
| li r7,0 |
| 1: lfsx fr0,r4,r7 |
| lfsx fr1,r5,r7 |
| lfsx fr2,r6,r7 |
| fmadds fr0,fr0,fr2,fr1 |
| stfsx fr0,r3,r7 |
| addi r7,r7,4 |
| bdnz 1b |
| lfd fr2,32(r1) |
| b fpdisable |
| |
| /* |
| * Vector negative multiply and subtract, floating point. |
| */ |
| _GLOBAL(vnmsubfp) |
| mflr r12 |
| bl fpenable |
| stfd fr2,32(r1) |
| li r0,4 |
| mtctr r0 |
| li r7,0 |
| 1: lfsx fr0,r4,r7 |
| lfsx fr1,r5,r7 |
| lfsx fr2,r6,r7 |
| fnmsubs fr0,fr0,fr2,fr1 |
| stfsx fr0,r3,r7 |
| addi r7,r7,4 |
| bdnz 1b |
| lfd fr2,32(r1) |
| b fpdisable |
| |
| /* |
| * Vector reciprocal estimate. We just compute 1.0/x. |
| * r3 -> destination, r4 -> source. |
| */ |
| _GLOBAL(vrefp) |
| mflr r12 |
| bl fpenable |
| li r0,4 |
| LDCONST(fr1, fpone) |
| mtctr r0 |
| li r6,0 |
| 1: lfsx fr0,r4,r6 |
| fdivs fr0,fr1,fr0 |
| stfsx fr0,r3,r6 |
| addi r6,r6,4 |
| bdnz 1b |
| b fpdisable |
| |
| /* |
| * Vector reciprocal square-root estimate, floating point. |
| * We use the frsqrte instruction for the initial estimate followed |
| * by 2 iterations of Newton-Raphson to get sufficient accuracy. |
| * r3 -> destination, r4 -> source. |
| */ |
| _GLOBAL(vrsqrtefp) |
| mflr r12 |
| bl fpenable |
| stfd fr2,32(r1) |
| stfd fr3,40(r1) |
| stfd fr4,48(r1) |
| stfd fr5,56(r1) |
| li r0,4 |
| LDCONST(fr4, fpone) |
| LDCONST(fr5, fphalf) |
| mtctr r0 |
| li r6,0 |
| 1: lfsx fr0,r4,r6 |
| frsqrte fr1,fr0 /* r = frsqrte(s) */ |
| fmuls fr3,fr1,fr0 /* r * s */ |
| fmuls fr2,fr1,fr5 /* r * 0.5 */ |
| fnmsubs fr3,fr1,fr3,fr4 /* 1 - s * r * r */ |
| fmadds fr1,fr2,fr3,fr1 /* r = r + 0.5 * r * (1 - s * r * r) */ |
| fmuls fr3,fr1,fr0 /* r * s */ |
| fmuls fr2,fr1,fr5 /* r * 0.5 */ |
| fnmsubs fr3,fr1,fr3,fr4 /* 1 - s * r * r */ |
| fmadds fr1,fr2,fr3,fr1 /* r = r + 0.5 * r * (1 - s * r * r) */ |
| stfsx fr1,r3,r6 |
| addi r6,r6,4 |
| bdnz 1b |
| lfd fr5,56(r1) |
| lfd fr4,48(r1) |
| lfd fr3,40(r1) |
| lfd fr2,32(r1) |
| b fpdisable |
