diff options
Diffstat (limited to 'arch/arm/vfp/vfphw.S')
| -rw-r--r-- | arch/arm/vfp/vfphw.S | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/arch/arm/vfp/vfphw.S b/arch/arm/vfp/vfphw.S new file mode 100644 index 0000000000..d5a03f3c10 --- /dev/null +++ b/arch/arm/vfp/vfphw.S @@ -0,0 +1,152 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * linux/arch/arm/vfp/vfphw.S + * + * Copyright (C) 2004 ARM Limited. + * Written by Deep Blue Solutions Limited. + */ +#include <linux/init.h> +#include <linux/linkage.h> +#include <asm/thread_info.h> +#include <asm/vfpmacros.h> +#include <linux/kern_levels.h> +#include <asm/assembler.h> +#include <asm/asm-offsets.h> + + .macro DBGSTR1, str, arg +#ifdef DEBUG + stmfd sp!, {r0-r3, ip, lr} + mov r1, \arg + ldr r0, =1f + bl _printk + ldmfd sp!, {r0-r3, ip, lr} + + .pushsection .rodata, "a" +1: .ascii KERN_DEBUG "VFP: \str\n" + .byte 0 + .previous +#endif + .endm + +ENTRY(vfp_load_state) + @ Load the current VFP state + @ r0 - load location + @ returns FPEXC + DBGSTR1 "load VFP state %p", r0 + @ Load the saved state back into the VFP + VFPFLDMIA r0, r1 @ reload the working registers while + @ FPEXC is in a safe state + ldmia r0, {r0-r3} @ load FPEXC, FPSCR, FPINST, FPINST2 + tst r0, #FPEXC_EX @ is there additional state to restore? + beq 1f + VFPFMXR FPINST, r2 @ restore FPINST (only if FPEXC.EX is set) + tst r0, #FPEXC_FP2V @ is there an FPINST2 to write? + beq 1f + VFPFMXR FPINST2, r3 @ FPINST2 if needed (and present) +1: + VFPFMXR FPSCR, r1 @ restore status + ret lr +ENDPROC(vfp_load_state) + +ENTRY(vfp_save_state) + @ Save the current VFP state + @ r0 - save location + @ r1 - FPEXC + DBGSTR1 "save VFP state %p", r0 + VFPFSTMIA r0, r2 @ save the working registers + VFPFMRX r2, FPSCR @ current status + tst r1, #FPEXC_EX @ is there additional state to save? + beq 1f + VFPFMRX r3, FPINST @ FPINST (only if FPEXC.EX is set) + tst r1, #FPEXC_FP2V @ is there an FPINST2 to read? + beq 1f + VFPFMRX r12, FPINST2 @ FPINST2 if needed (and present) +1: + stmia r0, {r1, r2, r3, r12} @ save FPEXC, FPSCR, FPINST, FPINST2 + ret lr +ENDPROC(vfp_save_state) + + .macro tbl_branch, base, tmp, shift +#ifdef CONFIG_THUMB2_KERNEL + adr \tmp, 1f + add \tmp, \tmp, \base, lsl \shift + ret \tmp +#else + add pc, pc, \base, lsl \shift + mov r0, r0 +#endif +1: + .endm + +ENTRY(vfp_get_float) + tbl_branch r0, r3, #3 + .fpu vfpv2 + .irp dr,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 +1: vmov r0, s\dr + ret lr + .org 1b + 8 + .endr + .irp dr,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31 +1: vmov r0, s\dr + ret lr + .org 1b + 8 + .endr +ENDPROC(vfp_get_float) + +ENTRY(vfp_put_float) + tbl_branch r1, r3, #3 + .fpu vfpv2 + .irp dr,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 +1: vmov s\dr, r0 + ret lr + .org 1b + 8 + .endr + .irp dr,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31 +1: vmov s\dr, r0 + ret lr + .org 1b + 8 + .endr +ENDPROC(vfp_put_float) + +ENTRY(vfp_get_double) + tbl_branch r0, r3, #3 + .fpu vfpv2 + .irp dr,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 +1: vmov r0, r1, d\dr + ret lr + .org 1b + 8 + .endr +#ifdef CONFIG_VFPv3 + @ d16 - d31 registers + .fpu vfpv3 + .irp dr,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31 +1: vmov r0, r1, d\dr + ret lr + .org 1b + 8 + .endr +#endif + + @ virtual register 16 (or 32 if VFPv3) for compare with zero + mov r0, #0 + mov r1, #0 + ret lr +ENDPROC(vfp_get_double) + +ENTRY(vfp_put_double) + tbl_branch r2, r3, #3 + .fpu vfpv2 + .irp dr,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 +1: vmov d\dr, r0, r1 + ret lr + .org 1b + 8 + .endr +#ifdef CONFIG_VFPv3 + .fpu vfpv3 + @ d16 - d31 registers + .irp dr,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31 +1: vmov d\dr, r0, r1 + ret lr + .org 1b + 8 + .endr +#endif +ENDPROC(vfp_put_double) |