758ef0a939
Fix a regression introduced with commit 2db9ca0a35 ("MIPS: Use struct
mips_abi offsets to save FP context") for MIPS I/I FP signal contexts,
by converting save/restore code to the updated internal API. Start FGR
offsets from 0 rather than SC_FPREGS from $a0 and use $a1 rather than
the offset of SC_FPC_CSR from $a0 for the Floating Point Control/Status
Register (FCSR).
Document the new internal API and adjust assembly code formatting for
consistency.
Signed-off-by: Maciej W. Rozycki <macro@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14476/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
100 lines
2.1 KiB
ArmAsm
100 lines
2.1 KiB
ArmAsm
/*
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* r6000_fpu.S: Save/restore floating point context for signal handlers.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1996 by Ralf Baechle
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*
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* Multi-arch abstraction and asm macros for easier reading:
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* Copyright (C) 1996 David S. Miller (davem@davemloft.net)
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*/
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#include <asm/asm.h>
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#include <asm/fpregdef.h>
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#include <asm/mipsregs.h>
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#include <asm/asm-offsets.h>
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#include <asm/regdef.h>
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.set noreorder
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.set mips2
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.set push
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SET_HARDFLOAT
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/**
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* _save_fp_context() - save FP context from the FPU
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* @a0 - pointer to fpregs field of sigcontext
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* @a1 - pointer to fpc_csr field of sigcontext
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*
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* Save FP context, including the 32 FP data registers and the FP
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* control & status register, from the FPU to signal context.
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*/
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LEAF(_save_fp_context)
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mfc0 t0,CP0_STATUS
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sll t0,t0,2
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bgez t0,1f
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nop
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cfc1 t1,fcr31
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/* Store the 16 double precision registers */
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sdc1 $f0,0(a0)
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sdc1 $f2,16(a0)
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sdc1 $f4,32(a0)
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sdc1 $f6,48(a0)
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sdc1 $f8,64(a0)
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sdc1 $f10,80(a0)
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sdc1 $f12,96(a0)
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sdc1 $f14,112(a0)
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sdc1 $f16,128(a0)
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sdc1 $f18,144(a0)
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sdc1 $f20,160(a0)
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sdc1 $f22,176(a0)
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sdc1 $f24,192(a0)
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sdc1 $f26,208(a0)
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sdc1 $f28,224(a0)
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sdc1 $f30,240(a0)
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jr ra
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sw t0,(a1)
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1: jr ra
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nop
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END(_save_fp_context)
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/**
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* _restore_fp_context() - restore FP context to the FPU
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* @a0 - pointer to fpregs field of sigcontext
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* @a1 - pointer to fpc_csr field of sigcontext
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*
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* Restore FP context, including the 32 FP data registers and the FP
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* control & status register, from signal context to the FPU.
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*/
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LEAF(_restore_fp_context)
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mfc0 t0,CP0_STATUS
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sll t0,t0,2
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bgez t0,1f
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lw t0,(a1)
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/* Restore the 16 double precision registers */
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ldc1 $f0,0(a0)
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ldc1 $f2,16(a0)
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ldc1 $f4,32(a0)
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ldc1 $f6,48(a0)
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ldc1 $f8,64(a0)
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ldc1 $f10,80(a0)
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ldc1 $f12,96(a0)
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ldc1 $f14,112(a0)
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ldc1 $f16,128(a0)
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ldc1 $f18,144(a0)
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ldc1 $f20,160(a0)
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ldc1 $f22,176(a0)
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ldc1 $f24,192(a0)
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ldc1 $f26,208(a0)
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ldc1 $f28,224(a0)
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ldc1 $f30,240(a0)
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jr ra
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ctc1 t0,fcr31
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1: jr ra
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nop
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END(_restore_fp_context)
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.set pop /* SET_HARDFLOAT */
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