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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/mips/kernel/r2300_fpu.S | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/mips/kernel/r2300_fpu.S')
-rw-r--r-- | arch/mips/kernel/r2300_fpu.S | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/arch/mips/kernel/r2300_fpu.S b/arch/mips/kernel/r2300_fpu.S new file mode 100644 index 0000000000..c000b22e3f --- /dev/null +++ b/arch/mips/kernel/r2300_fpu.S @@ -0,0 +1,130 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1996, 1998 by Ralf Baechle + * + * Multi-arch abstraction and asm macros for easier reading: + * Copyright (C) 1996 David S. Miller (davem@davemloft.net) + * + * Further modifications to make this work: + * Copyright (c) 1998 Harald Koerfgen + */ +#include <linux/export.h> +#include <asm/asm.h> +#include <asm/asmmacro.h> +#include <asm/errno.h> +#include <asm/fpregdef.h> +#include <asm/mipsregs.h> +#include <asm/asm-offsets.h> +#include <asm/regdef.h> + +#define EX(a,b) \ +9: a,##b; \ + .section __ex_table,"a"; \ + PTR_WD 9b,fault; \ + .previous + +#define EX2(a,b) \ +9: a,##b; \ + .section __ex_table,"a"; \ + PTR_WD 9b,fault; \ + PTR_WD 9b+4,fault; \ + .previous + + .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) + + .set noreorder + +/** + * _save_fp_context() - save FP context from the FPU + * @a0 - pointer to fpregs field of sigcontext + * @a1 - pointer to fpc_csr field of sigcontext + * + * Save FP context, including the 32 FP data registers and the FP + * control & status register, from the FPU to signal context. + */ +LEAF(_save_fp_context) + .set push + .set hardfloat + li v0, 0 # assume success + cfc1 t1, fcr31 + EX2(s.d $f0, 0(a0)) + EX2(s.d $f2, 16(a0)) + EX2(s.d $f4, 32(a0)) + EX2(s.d $f6, 48(a0)) + EX2(s.d $f8, 64(a0)) + EX2(s.d $f10, 80(a0)) + EX2(s.d $f12, 96(a0)) + EX2(s.d $f14, 112(a0)) + EX2(s.d $f16, 128(a0)) + EX2(s.d $f18, 144(a0)) + EX2(s.d $f20, 160(a0)) + EX2(s.d $f22, 176(a0)) + EX2(s.d $f24, 192(a0)) + EX2(s.d $f26, 208(a0)) + EX2(s.d $f28, 224(a0)) + EX2(s.d $f30, 240(a0)) + jr ra + EX(sw t1, (a1)) + .set pop + END(_save_fp_context) + +/** + * _restore_fp_context() - restore FP context to the FPU + * @a0 - pointer to fpregs field of sigcontext + * @a1 - pointer to fpc_csr field of sigcontext + * + * Restore FP context, including the 32 FP data registers and the FP + * control & status register, from signal context to the FPU. + */ +LEAF(_restore_fp_context) + .set push + .set hardfloat + li v0, 0 # assume success + EX(lw t0, (a1)) + EX2(l.d $f0, 0(a0)) + EX2(l.d $f2, 16(a0)) + EX2(l.d $f4, 32(a0)) + EX2(l.d $f6, 48(a0)) + EX2(l.d $f8, 64(a0)) + EX2(l.d $f10, 80(a0)) + EX2(l.d $f12, 96(a0)) + EX2(l.d $f14, 112(a0)) + EX2(l.d $f16, 128(a0)) + EX2(l.d $f18, 144(a0)) + EX2(l.d $f20, 160(a0)) + EX2(l.d $f22, 176(a0)) + EX2(l.d $f24, 192(a0)) + EX2(l.d $f26, 208(a0)) + EX2(l.d $f28, 224(a0)) + EX2(l.d $f30, 240(a0)) + jr ra + ctc1 t0, fcr31 + .set pop + END(_restore_fp_context) + .set reorder + + .type fault, @function + .ent fault +fault: li v0, -EFAULT + jr ra + .end fault |