aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-x86/i387_64.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-x86/i387_64.h')
-rw-r--r--include/asm-x86/i387_64.h374
1 files changed, 0 insertions, 374 deletions
diff --git a/include/asm-x86/i387_64.h b/include/asm-x86/i387_64.h
deleted file mode 100644
index de435b9114df..000000000000
--- a/include/asm-x86/i387_64.h
+++ /dev/null
@@ -1,374 +0,0 @@
-/*
- * 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_I387_H
-#define _ASM_X86_I387_H
-
-#include <linux/sched.h>
-#include <linux/kernel_stat.h>
-#include <linux/regset.h>
-#include <asm/processor.h>
-#include <asm/sigcontext.h>
-#include <asm/user.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 asmlinkage void math_state_restore(void);
-
-extern user_regset_active_fn fpregs_active, xfpregs_active;
-extern user_regset_get_fn fpregs_get, xfpregs_get, fpregs_soft_get;
-extern user_regset_set_fn fpregs_set, xfpregs_set, fpregs_soft_set;
-
-#ifdef CONFIG_IA32_EMULATION
-struct _fpstate_ia32;
-extern int save_i387_ia32(struct _fpstate_ia32 __user *buf);
-extern int restore_i387_ia32(struct _fpstate_ia32 __user *buf);
-#endif
-
-#ifdef CONFIG_X86_64
-
-/* 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");
-}
-
-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 __save_init_fpu() 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;
-}
-
-#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 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 __save_init_fpu(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);
- task_thread_info(tsk)->status &= ~TS_USEDFPU;
-}
-
-/*
- * Signal frame handlers.
- */
-
-static inline int save_i387(struct _fpstate __user *buf)
-{
- struct task_struct *tsk = current;
- int err = 0;
-
- BUILD_BUG_ON(sizeof(struct user_i387_struct) !=
- sizeof(tsk->thread.i387.fxsave));
-
- if ((unsigned long)buf % 16)
- printk("save_i387: bad fpstate %p\n", buf);
-
- if (!used_math())
- return 0;
- clear_used_math(); /* trigger finit */
- if (task_thread_info(tsk)->status & TS_USEDFPU) {
- err = save_i387_checking((struct i387_fxsave_struct __user *)buf);
- if (err) return err;
- task_thread_info(tsk)->status &= ~TS_USEDFPU;
- stts();
- } else {
- if (__copy_to_user(buf, &tsk->thread.i387.fxsave,
- sizeof(struct i387_fxsave_struct)))
- return -1;
- }
- return 1;
-}
-
-/*
- * This restores directly out of user space. Exceptions are handled.
- */
-static inline int restore_i387(struct _fpstate __user *buf)
-{
- set_used_math();
- if (!(task_thread_info(current)->status & TS_USEDFPU)) {
- clts();
- task_thread_info(current)->status |= TS_USEDFPU;
- }
- return restore_fpu_checking((__force struct i387_fxsave_struct *)buf);
-}
-
-#else /* CONFIG_X86_32 */
-
-static inline void tolerant_fwait(void)
-{
- asm volatile("fnclex ; fwait");
-}
-
-static inline void restore_fpu(struct task_struct *tsk)
-{
- /*
- * The "nop" is needed to make the instructions the same
- * length.
- */
- alternative_input(
- "nop ; frstor %1",
- "fxrstor %1",
- X86_FEATURE_FXSR,
- "m" ((tsk)->thread.i387.fxsave));
-}
-
-/* We need a safe address that is cheap to find and that is already
- in L1 during context switch. The best choices are unfortunately
- different for UP and SMP */
-#ifdef CONFIG_SMP
-#define safe_address (__per_cpu_offset[0])
-#else
-#define safe_address (kstat_cpu(0).cpustat.user)
-#endif
-
-/*
- * These must be called with preempt disabled
- */
-static inline void __save_init_fpu(struct task_struct *tsk)
-{
- /* Use more nops than strictly needed in case the compiler
- varies code */
- alternative_input(
- "fnsave %[fx] ;fwait;" GENERIC_NOP8 GENERIC_NOP4,
- "fxsave %[fx]\n"
- "bt $7,%[fsw] ; jnc 1f ; fnclex\n1:",
- X86_FEATURE_FXSR,
- [fx] "m" (tsk->thread.i387.fxsave),
- [fsw] "m" (tsk->thread.i387.fxsave.swd) : "memory");
- /* AMD K7/K8 CPUs don't save/restore FDP/FIP/FOP unless an exception
- is pending. Clear the x87 state here by setting it to fixed
- values. safe_address is a random variable that should be in L1 */
- alternative_input(
- GENERIC_NOP8 GENERIC_NOP2,
- "emms\n\t" /* clear stack tags */
- "fildl %[addr]", /* set F?P to defined value */
- X86_FEATURE_FXSAVE_LEAK,
- [addr] "m" (safe_address));
- task_thread_info(tsk)->status &= ~TS_USEDFPU;
-}
-
-/*
- * Signal frame handlers...
- */
-extern int save_i387(struct _fpstate __user *buf);
-extern int restore_i387(struct _fpstate __user *buf);
-
-#endif /* CONFIG_X86_64 */
-
-static inline void __unlazy_fpu(struct task_struct *tsk)
-{
- if (task_thread_info(tsk)->status & TS_USEDFPU) {
- __save_init_fpu(tsk);
- stts();
- } else
- tsk->fpu_counter = 0;
-}
-
-static inline void __clear_fpu(struct task_struct *tsk)
-{
- if (task_thread_info(tsk)->status & TS_USEDFPU) {
- tolerant_fwait();
- task_thread_info(tsk)->status &= ~TS_USEDFPU;
- stts();
- }
-}
-
-static inline void kernel_fpu_begin(void)
-{
- struct thread_info *me = current_thread_info();
- preempt_disable();
- if (me->status & TS_USEDFPU)
- __save_init_fpu(me->task);
- else
- clts();
-}
-
-static inline void kernel_fpu_end(void)
-{
- stts();
- preempt_enable();
-}
-
-#ifdef CONFIG_X86_64
-
-static inline void save_init_fpu(struct task_struct *tsk)
-{
- __save_init_fpu(tsk);
- stts();
-}
-
-#define unlazy_fpu __unlazy_fpu
-#define clear_fpu __clear_fpu
-
-#else /* CONFIG_X86_32 */
-
-/*
- * These disable preemption on their own and are safe
- */
-static inline void save_init_fpu(struct task_struct *tsk)
-{
- preempt_disable();
- __save_init_fpu(tsk);
- stts();
- preempt_enable();
-}
-
-static inline void unlazy_fpu(struct task_struct *tsk)
-{
- preempt_disable();
- __unlazy_fpu(tsk);
- preempt_enable();
-}
-
-static inline void clear_fpu(struct task_struct *tsk)
-{
- preempt_disable();
- __clear_fpu(tsk);
- preempt_enable();
-}
-
-#endif /* CONFIG_X86_64 */
-
-/*
- * ptrace request handlers...
- */
-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);
-
-struct user_fxsr_struct;
-extern int get_fpxregs(struct user_fxsr_struct __user *buf,
- struct task_struct *tsk);
-extern int set_fpxregs(struct task_struct *tsk,
- struct user_fxsr_struct __user *buf);
-
-/*
- * i387 state interaction
- */
-static inline unsigned short get_fpu_cwd(struct task_struct *tsk)
-{
- if (cpu_has_fxsr) {
- return tsk->thread.i387.fxsave.cwd;
- } else {
- return (unsigned short)tsk->thread.i387.fsave.cwd;
- }
-}
-
-static inline unsigned short get_fpu_swd(struct task_struct *tsk)
-{
- if (cpu_has_fxsr) {
- return tsk->thread.i387.fxsave.swd;
- } else {
- return (unsigned short)tsk->thread.i387.fsave.swd;
- }
-}
-
-static inline unsigned short get_fpu_mxcsr(struct task_struct *tsk)
-{
- if (cpu_has_xmm) {
- return tsk->thread.i387.fxsave.mxcsr;
- } else {
- return MXCSR_DEFAULT;
- }
-}
-
-#endif /* _ASM_X86_I387_H */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.