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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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>
136 lines
3.1 KiB
ArmAsm
136 lines
3.1 KiB
ArmAsm
/*
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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, 1998 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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* Further modifications to make this work:
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* Copyright (c) 1998 Harald Koerfgen
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*/
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#include <asm/asm.h>
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#include <asm/errno.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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#define EX(a,b) \
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9: a,##b; \
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.section __ex_table,"a"; \
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PTR 9b,fault; \
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.previous
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.set noreorder
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.set mips1
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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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.set push
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SET_HARDFLOAT
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li v0, 0 # assume success
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cfc1 t1, fcr31
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EX(swc1 $f0, 0(a0))
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EX(swc1 $f1, 8(a0))
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EX(swc1 $f2, 16(a0))
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EX(swc1 $f3, 24(a0))
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EX(swc1 $f4, 32(a0))
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EX(swc1 $f5, 40(a0))
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EX(swc1 $f6, 48(a0))
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EX(swc1 $f7, 56(a0))
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EX(swc1 $f8, 64(a0))
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EX(swc1 $f9, 72(a0))
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EX(swc1 $f10, 80(a0))
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EX(swc1 $f11, 88(a0))
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EX(swc1 $f12, 96(a0))
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EX(swc1 $f13, 104(a0))
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EX(swc1 $f14, 112(a0))
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EX(swc1 $f15, 120(a0))
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EX(swc1 $f16, 128(a0))
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EX(swc1 $f17, 136(a0))
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EX(swc1 $f18, 144(a0))
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EX(swc1 $f19, 152(a0))
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EX(swc1 $f20, 160(a0))
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EX(swc1 $f21, 168(a0))
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EX(swc1 $f22, 176(a0))
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EX(swc1 $f23, 184(a0))
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EX(swc1 $f24, 192(a0))
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EX(swc1 $f25, 200(a0))
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EX(swc1 $f26, 208(a0))
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EX(swc1 $f27, 216(a0))
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EX(swc1 $f28, 224(a0))
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EX(swc1 $f29, 232(a0))
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EX(swc1 $f30, 240(a0))
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EX(swc1 $f31, 248(a0))
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jr ra
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EX(sw t1, (a1))
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.set pop
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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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.set push
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SET_HARDFLOAT
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li v0, 0 # assume success
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EX(lw t0, (a1))
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EX(lwc1 $f0, 0(a0))
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EX(lwc1 $f1, 8(a0))
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EX(lwc1 $f2, 16(a0))
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EX(lwc1 $f3, 24(a0))
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EX(lwc1 $f4, 32(a0))
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EX(lwc1 $f5, 40(a0))
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EX(lwc1 $f6, 48(a0))
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EX(lwc1 $f7, 56(a0))
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EX(lwc1 $f8, 64(a0))
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EX(lwc1 $f9, 72(a0))
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EX(lwc1 $f10, 80(a0))
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EX(lwc1 $f11, 88(a0))
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EX(lwc1 $f12, 96(a0))
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EX(lwc1 $f13, 104(a0))
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EX(lwc1 $f14, 112(a0))
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EX(lwc1 $f15, 120(a0))
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EX(lwc1 $f16, 128(a0))
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EX(lwc1 $f17, 136(a0))
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EX(lwc1 $f18, 144(a0))
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EX(lwc1 $f19, 152(a0))
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EX(lwc1 $f20, 160(a0))
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EX(lwc1 $f21, 168(a0))
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EX(lwc1 $f22, 176(a0))
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EX(lwc1 $f23, 184(a0))
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EX(lwc1 $f24, 192(a0))
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EX(lwc1 $f25, 200(a0))
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EX(lwc1 $f26, 208(a0))
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EX(lwc1 $f27, 216(a0))
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EX(lwc1 $f28, 224(a0))
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EX(lwc1 $f29, 232(a0))
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EX(lwc1 $f30, 240(a0))
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EX(lwc1 $f31, 248(a0))
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jr ra
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ctc1 t0, fcr31
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.set pop
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END(_restore_fp_context)
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.set reorder
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.type fault, @function
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.ent fault
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fault: li v0, -EFAULT
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jr ra
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.end fault
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