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Diffstat (limited to 'include/asm-x86_64/i387.h')
| -rw-r--r-- | include/asm-x86_64/i387.h | 209 |
1 files changed, 0 insertions, 209 deletions
diff --git a/include/asm-x86_64/i387.h b/include/asm-x86_64/i387.h deleted file mode 100644 index 0217b74cc9fc..000000000000 --- a/include/asm-x86_64/i387.h +++ /dev/null @@ -1,209 +0,0 @@ -/* - * include/asm-x86_64/i387.h - * - * Copyright (C) 1994 Linus Torvalds - * - * Pentium III FXSR, SSE support - * General FPU state handling cleanups - * Gareth Hughes <gareth@valinux.com>, May 2000 - * x86-64 work by Andi Kleen 2002 - */ - -#ifndef __ASM_X86_64_I387_H -#define __ASM_X86_64_I387_H - -#include <linux/sched.h> -#include <asm/processor.h> -#include <asm/sigcontext.h> -#include <asm/user.h> -#include <asm/thread_info.h> -#include <asm/uaccess.h> - -extern void fpu_init(void); -extern unsigned int mxcsr_feature_mask; -extern void mxcsr_feature_mask_init(void); -extern void init_fpu(struct task_struct *child); -extern int save_i387(struct _fpstate __user *buf); -extern asmlinkage void math_state_restore(void); - -/* - * FPU lazy state save handling... - */ - -#define unlazy_fpu(tsk) do { \ - if (task_thread_info(tsk)->status & TS_USEDFPU) \ - save_init_fpu(tsk); \ - else \ - tsk->fpu_counter = 0; \ -} while (0) - -/* Ignore delayed exceptions from user space */ -static inline void tolerant_fwait(void) -{ - asm volatile("1: fwait\n" - "2:\n" - " .section __ex_table,\"a\"\n" - " .align 8\n" - " .quad 1b,2b\n" - " .previous\n"); -} - -#define clear_fpu(tsk) do { \ - if (task_thread_info(tsk)->status & TS_USEDFPU) { \ - tolerant_fwait(); \ - task_thread_info(tsk)->status &= ~TS_USEDFPU; \ - stts(); \ - } \ -} while (0) - -/* - * ptrace request handers... - */ -extern int get_fpregs(struct user_i387_struct __user *buf, - struct task_struct *tsk); -extern int set_fpregs(struct task_struct *tsk, - struct user_i387_struct __user *buf); - -/* - * i387 state interaction - */ -#define get_fpu_mxcsr(t) ((t)->thread.i387.fxsave.mxcsr) -#define get_fpu_cwd(t) ((t)->thread.i387.fxsave.cwd) -#define get_fpu_fxsr_twd(t) ((t)->thread.i387.fxsave.twd) -#define get_fpu_swd(t) ((t)->thread.i387.fxsave.swd) -#define set_fpu_cwd(t,val) ((t)->thread.i387.fxsave.cwd = (val)) -#define set_fpu_swd(t,val) ((t)->thread.i387.fxsave.swd = (val)) -#define set_fpu_fxsr_twd(t,val) ((t)->thread.i387.fxsave.twd = (val)) - -#define X87_FSW_ES (1 << 7) /* Exception Summary */ - -/* AMD CPUs don't save/restore FDP/FIP/FOP unless an exception - is pending. Clear the x87 state here by setting it to fixed - values. The kernel data segment can be sometimes 0 and sometimes - new user value. Both should be ok. - Use the PDA as safe address because it should be already in L1. */ -static inline void clear_fpu_state(struct i387_fxsave_struct *fx) -{ - if (unlikely(fx->swd & X87_FSW_ES)) - asm volatile("fnclex"); - alternative_input(ASM_NOP8 ASM_NOP2, - " emms\n" /* clear stack tags */ - " fildl %%gs:0", /* load to clear state */ - X86_FEATURE_FXSAVE_LEAK); -} - -static inline int restore_fpu_checking(struct i387_fxsave_struct *fx) -{ - int err; - - asm volatile("1: rex64/fxrstor (%[fx])\n\t" - "2:\n" - ".section .fixup,\"ax\"\n" - "3: movl $-1,%[err]\n" - " jmp 2b\n" - ".previous\n" - ".section __ex_table,\"a\"\n" - " .align 8\n" - " .quad 1b,3b\n" - ".previous" - : [err] "=r" (err) -#if 0 /* See comment in __fxsave_clear() below. */ - : [fx] "r" (fx), "m" (*fx), "0" (0)); -#else - : [fx] "cdaSDb" (fx), "m" (*fx), "0" (0)); -#endif - if (unlikely(err)) - init_fpu(current); - return err; -} - -static inline int save_i387_checking(struct i387_fxsave_struct __user *fx) -{ - int err; - - asm volatile("1: rex64/fxsave (%[fx])\n\t" - "2:\n" - ".section .fixup,\"ax\"\n" - "3: movl $-1,%[err]\n" - " jmp 2b\n" - ".previous\n" - ".section __ex_table,\"a\"\n" - " .align 8\n" - " .quad 1b,3b\n" - ".previous" - : [err] "=r" (err), "=m" (*fx) -#if 0 /* See comment in __fxsave_clear() below. */ - : [fx] "r" (fx), "0" (0)); -#else - : [fx] "cdaSDb" (fx), "0" (0)); -#endif - if (unlikely(err) && __clear_user(fx, sizeof(struct i387_fxsave_struct))) - err = -EFAULT; - /* No need to clear here because the caller clears USED_MATH */ - return err; -} - -static inline void __fxsave_clear(struct task_struct *tsk) -{ - /* Using "rex64; fxsave %0" is broken because, if the memory operand - uses any extended registers for addressing, a second REX prefix - will be generated (to the assembler, rex64 followed by semicolon - is a separate instruction), and hence the 64-bitness is lost. */ -#if 0 - /* Using "fxsaveq %0" would be the ideal choice, but is only supported - starting with gas 2.16. */ - __asm__ __volatile__("fxsaveq %0" - : "=m" (tsk->thread.i387.fxsave)); -#elif 0 - /* Using, as a workaround, the properly prefixed form below isn't - accepted by any binutils version so far released, complaining that - the same type of prefix is used twice if an extended register is - needed for addressing (fix submitted to mainline 2005-11-21). */ - __asm__ __volatile__("rex64/fxsave %0" - : "=m" (tsk->thread.i387.fxsave)); -#else - /* This, however, we can work around by forcing the compiler to select - an addressing mode that doesn't require extended registers. */ - __asm__ __volatile__("rex64/fxsave %P2(%1)" - : "=m" (tsk->thread.i387.fxsave) - : "cdaSDb" (tsk), - "i" (offsetof(__typeof__(*tsk), - thread.i387.fxsave))); -#endif - clear_fpu_state(&tsk->thread.i387.fxsave); -} - -static inline void kernel_fpu_begin(void) -{ - struct thread_info *me = current_thread_info(); - preempt_disable(); - if (me->status & TS_USEDFPU) { - __fxsave_clear(me->task); - me->status &= ~TS_USEDFPU; - return; - } - clts(); -} - -static inline void kernel_fpu_end(void) -{ - stts(); - preempt_enable(); -} - -static inline void save_init_fpu(struct task_struct *tsk) -{ - __fxsave_clear(tsk); - task_thread_info(tsk)->status &= ~TS_USEDFPU; - stts(); -} - -/* - * This restores directly out of user space. Exceptions are handled. - */ -static inline int restore_i387(struct _fpstate __user *buf) -{ - return restore_fpu_checking((__force struct i387_fxsave_struct *)buf); -} - -#endif /* __ASM_X86_64_I387_H */ |