112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __X86_KERNEL_FPU_LEGACY_H
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#define __X86_KERNEL_FPU_LEGACY_H
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#include <asm/fpu/types.h>
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extern unsigned int mxcsr_feature_mask;
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static inline void ldmxcsr(u32 mxcsr)
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{
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asm volatile("ldmxcsr %0" :: "m" (mxcsr));
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}
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/*
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* Returns 0 on success or the trap number when the operation raises an
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* exception.
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*/
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#define user_insn(insn, output, input...) \
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({ \
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int err; \
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\
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might_fault(); \
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\
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asm volatile(ASM_STAC "\n" \
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"1: " #insn "\n" \
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"2: " ASM_CLAC "\n" \
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_ASM_EXTABLE_TYPE(1b, 2b, EX_TYPE_FAULT_MCE_SAFE) \
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: [err] "=a" (err), output \
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: "0"(0), input); \
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err; \
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})
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#define kernel_insn_err(insn, output, input...) \
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({ \
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int err; \
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asm volatile("1:" #insn "\n\t" \
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"2:\n" \
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_ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, %[err]) \
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: [err] "=r" (err), output \
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: "0"(0), input); \
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err; \
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})
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#define kernel_insn(insn, output, input...) \
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asm volatile("1:" #insn "\n\t" \
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"2:\n" \
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_ASM_EXTABLE_TYPE(1b, 2b, EX_TYPE_FPU_RESTORE) \
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: output : input)
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static inline int fnsave_to_user_sigframe(struct fregs_state __user *fx)
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{
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return user_insn(fnsave %[fx]; fwait, [fx] "=m" (*fx), "m" (*fx));
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}
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static inline int fxsave_to_user_sigframe(struct fxregs_state __user *fx)
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{
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if (IS_ENABLED(CONFIG_X86_32))
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return user_insn(fxsave %[fx], [fx] "=m" (*fx), "m" (*fx));
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else
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return user_insn(fxsaveq %[fx], [fx] "=m" (*fx), "m" (*fx));
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}
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static inline void fxrstor(struct fxregs_state *fx)
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{
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if (IS_ENABLED(CONFIG_X86_32))
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kernel_insn(fxrstor %[fx], "=m" (*fx), [fx] "m" (*fx));
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else
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kernel_insn(fxrstorq %[fx], "=m" (*fx), [fx] "m" (*fx));
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}
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static inline int fxrstor_safe(struct fxregs_state *fx)
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{
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if (IS_ENABLED(CONFIG_X86_32))
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return kernel_insn_err(fxrstor %[fx], "=m" (*fx), [fx] "m" (*fx));
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else
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return kernel_insn_err(fxrstorq %[fx], "=m" (*fx), [fx] "m" (*fx));
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}
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static inline int fxrstor_from_user_sigframe(struct fxregs_state __user *fx)
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{
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if (IS_ENABLED(CONFIG_X86_32))
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return user_insn(fxrstor %[fx], "=m" (*fx), [fx] "m" (*fx));
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else
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return user_insn(fxrstorq %[fx], "=m" (*fx), [fx] "m" (*fx));
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}
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static inline void frstor(struct fregs_state *fx)
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{
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kernel_insn(frstor %[fx], "=m" (*fx), [fx] "m" (*fx));
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}
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static inline int frstor_safe(struct fregs_state *fx)
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{
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return kernel_insn_err(frstor %[fx], "=m" (*fx), [fx] "m" (*fx));
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}
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static inline int frstor_from_user_sigframe(struct fregs_state __user *fx)
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{
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return user_insn(frstor %[fx], "=m" (*fx), [fx] "m" (*fx));
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}
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static inline void fxsave(struct fxregs_state *fx)
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{
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if (IS_ENABLED(CONFIG_X86_32))
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asm volatile( "fxsave %[fx]" : [fx] "=m" (*fx));
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else
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asm volatile("fxsaveq %[fx]" : [fx] "=m" (*fx));
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}
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#endif
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