diff options
| author | Paul Burton | 2017-06-05 11:21:29 -0700 |
|---|---|---|
| committer | Ralf Baechle | 2017-08-29 15:21:51 +0200 |
| commit | 423fb0d50890dd48907298e7453faaeb5185b814 (patch) | |
| tree | 5a194c1c8074836156a64d08824d0c7d97f73ce9 /arch/mips/kernel/r2300_fpu.S | |
| parent | a2aea699b1dde309f189ab41af41fae2d3345783 (diff) | |
MIPS: Move r2300 FP code from r2300_switch.S to r2300_fpu.S
Move _save_fp(), _restore_fp() & _init_fpu() out of r2300_switch.S &
into r2300_fpu.S. This logically places all FP-related asm code into
r2300_fpu.S & provides consistency with R4K after the preceding commit.
Besides cleaning up this will be useful for later patches which disable
FP support.
[ralf@linux-mips.org: Fixed build issues reported by Arnd Bergmann
<arnd@arndb.de>]
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16238/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/r2300_fpu.S')
| -rw-r--r-- | arch/mips/kernel/r2300_fpu.S | 80 |
1 files changed, 79 insertions, 1 deletions
diff --git a/arch/mips/kernel/r2300_fpu.S b/arch/mips/kernel/r2300_fpu.S index 918f2f6d3861..3062ba66c563 100644 --- a/arch/mips/kernel/r2300_fpu.S +++ b/arch/mips/kernel/r2300_fpu.S @@ -12,7 +12,9 @@ * Copyright (c) 1998 Harald Koerfgen */ #include <asm/asm.h> +#include <asm/asmmacro.h> #include <asm/errno.h> +#include <asm/export.h> #include <asm/fpregdef.h> #include <asm/mipsregs.h> #include <asm/asm-offsets.h> @@ -31,9 +33,85 @@ PTR 9b+4,bad_stack; \ .previous - .set noreorder .set mips1 +/* + * Save a thread's fp context. + */ +LEAF(_save_fp) +EXPORT_SYMBOL(_save_fp) + fpu_save_single a0, t1 # clobbers t1 + jr ra + END(_save_fp) + +/* + * Restore a thread's fp context. + */ +LEAF(_restore_fp) + fpu_restore_single a0, t1 # clobbers t1 + jr ra + END(_restore_fp) + +/* + * Load the FPU with signalling NANS. This bit pattern we're using has + * the property that no matter whether considered as single or as double + * precision represents signaling NANS. + * + * The value to initialize fcr31 to comes in $a0. + */ + + .set push + SET_HARDFLOAT + +LEAF(_init_fpu) + mfc0 t0, CP0_STATUS + li t1, ST0_CU1 + or t0, t1 + mtc0 t0, CP0_STATUS + + ctc1 a0, fcr31 + + li t0, -1 + + mtc1 t0, $f0 + mtc1 t0, $f1 + mtc1 t0, $f2 + mtc1 t0, $f3 + mtc1 t0, $f4 + mtc1 t0, $f5 + mtc1 t0, $f6 + mtc1 t0, $f7 + mtc1 t0, $f8 + mtc1 t0, $f9 + mtc1 t0, $f10 + mtc1 t0, $f11 + mtc1 t0, $f12 + mtc1 t0, $f13 + mtc1 t0, $f14 + mtc1 t0, $f15 + mtc1 t0, $f16 + mtc1 t0, $f17 + mtc1 t0, $f18 + mtc1 t0, $f19 + mtc1 t0, $f20 + mtc1 t0, $f21 + mtc1 t0, $f22 + mtc1 t0, $f23 + mtc1 t0, $f24 + mtc1 t0, $f25 + mtc1 t0, $f26 + mtc1 t0, $f27 + mtc1 t0, $f28 + mtc1 t0, $f29 + mtc1 t0, $f30 + mtc1 t0, $f31 + jr ra + END(_init_fpu) + + .set pop + + .set noreorder + /** * _save_fp_context() - save FP context from the FPU * @a0 - pointer to fpregs field of sigcontext |