mirror of https://gitee.com/openkylin/linux.git
x86/fpu: Move the signal frame handling code closer to each other
Consolidate more signal frame related functions: text data bss dec filename 14108070 2575280 1634304 18317654 vmlinux.before 14107944 2575344 1634304 18317592 vmlinux.after Also, while moving it, rename alloc_mathframe() to fpu__alloc_mathframe(). Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -325,7 +325,7 @@ static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
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if (fpu->fpstate_active) {
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unsigned long fx_aligned, math_size;
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sp = alloc_mathframe(sp, 1, &fx_aligned, &math_size);
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sp = fpu__alloc_mathframe(sp, 1, &fx_aligned, &math_size);
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*fpstate = (struct _fpstate_ia32 __user *) sp;
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if (copy_fpstate_to_sigframe(*fpstate, (void __user *)fx_aligned,
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math_size) < 0)
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@ -53,6 +53,7 @@ extern int dump_fpu(struct pt_regs *, struct user_i387_struct *);
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*/
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extern void fpu__save(struct fpu *fpu);
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extern void fpu__restore(void);
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extern int fpu__restore_sig(void __user *buf, int ia32_frame);
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extern void fpu__drop(struct fpu *fpu);
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extern int fpu__copy(struct fpu *dst_fpu, struct fpu *src_fpu);
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extern void fpu__reset(struct fpu *fpu);
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@ -497,25 +498,6 @@ static inline void switch_fpu_finish(struct fpu *new_fpu, fpu_switch_t fpu_switc
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* Signal frame handlers...
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*/
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extern int copy_fpstate_to_sigframe(void __user *buf, void __user *fx, int size);
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extern int __fpu__restore_sig(void __user *buf, void __user *fx, int size);
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static inline int xstate_sigframe_size(void)
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{
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return use_xsave() ? xstate_size + FP_XSTATE_MAGIC2_SIZE : xstate_size;
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}
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static inline int fpu__restore_sig(void __user *buf, int ia32_frame)
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{
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void __user *buf_fx = buf;
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int size = xstate_sigframe_size();
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if (ia32_frame && use_fxsr()) {
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buf_fx = buf + sizeof(struct i387_fsave_struct);
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size += sizeof(struct i387_fsave_struct);
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}
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return __fpu__restore_sig(buf, buf_fx, size);
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}
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/*
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* Needs to be preemption-safe.
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@ -565,20 +547,8 @@ static inline unsigned short get_fpu_mxcsr(struct task_struct *tsk)
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}
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}
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static inline unsigned long
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alloc_mathframe(unsigned long sp, int ia32_frame, unsigned long *buf_fx,
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unsigned long *size)
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{
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unsigned long frame_size = xstate_sigframe_size();
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*buf_fx = sp = round_down(sp - frame_size, 64);
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if (ia32_frame && use_fxsr()) {
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frame_size += sizeof(struct i387_fsave_struct);
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sp -= sizeof(struct i387_fsave_struct);
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}
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*size = frame_size;
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return sp;
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}
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unsigned long
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fpu__alloc_mathframe(unsigned long sp, int ia32_frame,
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unsigned long *buf_fx, unsigned long *size);
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#endif /* _ASM_X86_FPU_INTERNAL_H */
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@ -388,7 +388,7 @@ static inline int restore_user_xstate(void __user *buf, u64 xbv, int fx_only)
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return frstor_user(buf);
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}
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int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
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static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
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{
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int ia32_fxstate = (buf != buf_fx);
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struct task_struct *tsk = current;
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@ -482,6 +482,43 @@ int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
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return 0;
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}
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static inline int xstate_sigframe_size(void)
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{
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return use_xsave() ? xstate_size + FP_XSTATE_MAGIC2_SIZE : xstate_size;
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}
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/*
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* Restore FPU state from a sigframe:
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*/
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int fpu__restore_sig(void __user *buf, int ia32_frame)
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{
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void __user *buf_fx = buf;
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int size = xstate_sigframe_size();
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if (ia32_frame && use_fxsr()) {
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buf_fx = buf + sizeof(struct i387_fsave_struct);
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size += sizeof(struct i387_fsave_struct);
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}
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return __fpu__restore_sig(buf, buf_fx, size);
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}
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unsigned long
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fpu__alloc_mathframe(unsigned long sp, int ia32_frame,
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unsigned long *buf_fx, unsigned long *size)
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{
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unsigned long frame_size = xstate_sigframe_size();
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*buf_fx = sp = round_down(sp - frame_size, 64);
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if (ia32_frame && use_fxsr()) {
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frame_size += sizeof(struct i387_fsave_struct);
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sp -= sizeof(struct i387_fsave_struct);
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}
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*size = frame_size;
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return sp;
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}
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/*
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* Prepare the SW reserved portion of the fxsave memory layout, indicating
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* the presence of the extended state information in the memory layout
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@ -219,8 +219,8 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
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}
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if (fpu->fpstate_active) {
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sp = alloc_mathframe(sp, config_enabled(CONFIG_X86_32),
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&buf_fx, &math_size);
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sp = fpu__alloc_mathframe(sp, config_enabled(CONFIG_X86_32),
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&buf_fx, &math_size);
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*fpstate = (void __user *)sp;
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}
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