diff options
| -rw-r--r-- | arch/x86/ia32/fpu32.c | 181 | ||||
| -rw-r--r-- | arch/x86/kernel/i387_64.c | 119 | ||||
| -rw-r--r-- | include/asm-x86/i387.h | 375 | ||||
| -rw-r--r-- | include/asm-x86/i387_32.h | 149 | ||||
| -rw-r--r-- | include/asm-x86/i387_64.h | 374 |
5 files changed, 374 insertions, 824 deletions
diff --git a/arch/x86/ia32/fpu32.c b/arch/x86/ia32/fpu32.c deleted file mode 100644 index ae80745f668..00000000000 --- a/arch/x86/ia32/fpu32.c +++ /dev/null @@ -1,181 +0,0 @@ -/* - * Copyright 2002 Andi Kleen, SuSE Labs. - * FXSAVE<->i387 conversion support. Based on code by Gareth Hughes. - * This is used for ptrace, signals and coredumps in 32bit emulation. - */ - -#include <linux/sched.h> -#include <asm/sigcontext32.h> -#include <asm/processor.h> -#include <asm/uaccess.h> -#include <asm/i387.h> - -static inline unsigned short twd_i387_to_fxsr(unsigned short twd) -{ - unsigned int tmp; /* to avoid 16 bit prefixes in the code */ - - /* Transform each pair of bits into 01 (valid) or 00 (empty) */ - tmp = ~twd; - tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */ - /* and move the valid bits to the lower byte. */ - tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */ - tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */ - tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */ - return tmp; -} - -#define FPREG_ADDR(f, n) ((void *)&(f)->st_space + (n) * 16); -#define FP_EXP_TAG_VALID 0 -#define FP_EXP_TAG_ZERO 1 -#define FP_EXP_TAG_SPECIAL 2 -#define FP_EXP_TAG_EMPTY 3 - -static inline unsigned long twd_fxsr_to_i387(struct i387_fxsave_struct *fxsave) -{ - struct _fpxreg *st; - unsigned long tos = (fxsave->swd >> 11) & 7; - unsigned long twd = (unsigned long) fxsave->twd; - unsigned long tag; - unsigned long ret = 0xffff0000; - int i; - - for (i = 0; i < 8; i++, twd >>= 1) { - if (twd & 0x1) { - st = FPREG_ADDR(fxsave, (i - tos) & 7); - - switch (st->exponent & 0x7fff) { - case 0x7fff: - tag = FP_EXP_TAG_SPECIAL; - break; - case 0x0000: - if (!st->significand[0] && - !st->significand[1] && - !st->significand[2] && - !st->significand[3]) - tag = FP_EXP_TAG_ZERO; - else - tag = FP_EXP_TAG_SPECIAL; - break; - default: - if (st->significand[3] & 0x8000) - tag = FP_EXP_TAG_VALID; - else - tag = FP_EXP_TAG_SPECIAL; - break; - } - } else { - tag = FP_EXP_TAG_EMPTY; - } - ret |= tag << (2 * i); - } - return ret; -} - -#define G(num, val) err |= __get_user(val, num + (u32 __user *)buf) - -static inline int convert_fxsr_from_user(struct i387_fxsave_struct *fxsave, - struct _fpstate_ia32 __user *buf) -{ - struct _fpxreg *to; - struct _fpreg __user *from; - int i, err = 0; - u32 v; - - G(0, fxsave->cwd); - G(1, fxsave->swd); - G(2, fxsave->twd); - fxsave->twd = twd_i387_to_fxsr(fxsave->twd); - G(3, fxsave->rip); - G(4, v); - /* cs ignored */ - fxsave->fop = v>>16; - G(5, fxsave->rdp); - /* 6: ds ignored */ - if (err) - return -1; - - to = (struct _fpxreg *)&fxsave->st_space[0]; - from = &buf->_st[0]; - for (i = 0; i < 8; i++, to++, from++) { - if (__copy_from_user(to, from, sizeof(*from))) - return -1; - } - return 0; -} - -#define P(num, val) err |= __put_user(val, num + (u32 __user *)buf) - -static inline int convert_fxsr_to_user(struct _fpstate_ia32 __user *buf, - struct i387_fxsave_struct *fxsave, - struct pt_regs *regs, - struct task_struct *tsk) -{ - struct _fpreg __user *to; - struct _fpxreg *from; - int i, err = 0; - u16 cs, ds; - - if (tsk == current) { - /* - * should be actually ds/cs at fpu exception time, but - * that information is not available in 64bit mode. - */ - asm("movw %%ds,%0 " : "=r" (ds)); - asm("movw %%cs,%0 " : "=r" (cs)); - } else { - /* ptrace. task has stopped. */ - ds = tsk->thread.ds; - cs = regs->cs; - } - - P(0, (u32)fxsave->cwd | 0xffff0000); - P(1, (u32)fxsave->swd | 0xffff0000); - P(2, twd_fxsr_to_i387(fxsave)); - P(3, (u32)fxsave->rip); - P(4, cs | ((u32)fxsave->fop) << 16); - P(5, fxsave->rdp); - P(6, 0xffff0000 | ds); - - if (err) - return -1; - - to = &buf->_st[0]; - from = (struct _fpxreg *) &fxsave->st_space[0]; - for (i = 0; i < 8; i++, to++, from++) { - if (__copy_to_user(to, from, sizeof(*to))) - return -1; - } - return 0; -} - -int restore_i387_ia32(struct task_struct *tsk, - struct _fpstate_ia32 __user *buf, int fsave) -{ - clear_fpu(tsk); - if (!fsave) { - if (__copy_from_user(&tsk->thread.i387.fxsave, - &buf->_fxsr_env[0], - sizeof(struct i387_fxsave_struct))) - return -1; - tsk->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask; - set_stopped_child_used_math(tsk); - } - return convert_fxsr_from_user(&tsk->thread.i387.fxsave, buf); -} - -int save_i387_ia32(struct task_struct *tsk, struct _fpstate_ia32 __user *buf, - struct pt_regs *regs, int fsave) -{ - int err = 0; - - init_fpu(tsk); - if (convert_fxsr_to_user(buf, &tsk->thread.i387.fxsave, regs, tsk)) - return -1; - if (fsave) - return 0; - err |= __put_user(tsk->thread.i387.fxsave.swd, &buf->status); - err |= __put_user(X86_FXSR_MAGIC, &buf->magic); - err |= __copy_to_user(&buf->_fxsr_env[0], &tsk->thread.i387.fxsave, - sizeof(struct i387_fxsave_struct)); - return err ? -1 : 1; -} diff --git a/arch/x86/kernel/i387_64.c b/arch/x86/kernel/i387_64.c deleted file mode 100644 index f335a76d7ea..00000000000 --- a/arch/x86/kernel/i387_64.c +++ /dev/null @@ -1,119 +0,0 @@ -/* - * Copyright (C) 1994 Linus Torvalds - * Copyright (C) 2002 Andi Kleen, SuSE Labs - * - * Pentium III FXSR, SSE support - * General FPU state handling cleanups - * Gareth Hughes <gareth@valinux.com>, May 2000 - * - * x86-64 rework 2002 Andi Kleen. - * Does direct fxsave in and out of user space now for signal handlers. - * All the FSAVE<->FXSAVE conversion code has been moved to the 32bit emulation, - * the 64bit user space sees a FXSAVE frame directly. - */ - -#include <linux/sched.h> -#include <linux/init.h> -#include <asm/processor.h> -#include <asm/i387.h> -#include <asm/sigcontext.h> -#include <asm/user.h> -#include <asm/ptrace.h> -#include <asm/uaccess.h> - -unsigned int mxcsr_feature_mask __read_mostly = 0xffffffff; - -void mxcsr_feature_mask_init(void) -{ - unsigned int mask; - clts(); - memset(¤t->thread.i387.fxsave, 0, sizeof(struct i387_fxsave_struct)); - asm volatile("fxsave %0" : : "m" (current->thread.i387.fxsave)); - mask = current->thread.i387.fxsave.mxcsr_mask; - if (mask == 0) mask = 0x0000ffbf; - mxcsr_feature_mask &= mask; - stts(); -} - -/* - * Called at bootup to set up the initial FPU state that is later cloned - * into all processes. - */ -void __cpuinit fpu_init(void) -{ - unsigned long oldcr0 = read_cr0(); - extern void __bad_fxsave_alignment(void); - - if (offsetof(struct task_struct, thread.i387.fxsave) & 15) - __bad_fxsave_alignment(); - set_in_cr4(X86_CR4_OSFXSR); - set_in_cr4(X86_CR4_OSXMMEXCPT); - - write_cr0(oldcr0 & ~((1UL<<3)|(1UL<<2))); /* clear TS and EM */ - - mxcsr_feature_mask_init(); - /* clean state in init */ - current_thread_info()->status = 0; - clear_used_math(); -} - -void init_fpu(struct task_struct *child) -{ - if (tsk_used_math(child)) { - if (child == current) - unlazy_fpu(child); - return; - } - memset(&child->thread.i387.fxsave, 0, sizeof(struct i387_fxsave_struct)); - child->thread.i387.fxsave.cwd = 0x37f; - child->thread.i387.fxsave.mxcsr = 0x1f80; - /* only the device not available exception or ptrace can call init_fpu */ - set_stopped_child_used_math(child); -} - -/* - * ptrace request handlers. - */ - -int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *tsk) -{ - init_fpu(tsk); - return __copy_to_user(buf, &tsk->thread.i387.fxsave, - sizeof(struct user_i387_struct)) ? -EFAULT : 0; -} - -int set_fpregs(struct task_struct *tsk, struct user_i387_struct __user *buf) -{ - if (__copy_from_user(&tsk->thread.i387.fxsave, buf, - sizeof(struct user_i387_struct))) - return -EFAULT; - return 0; -} - -/* - * FPU state for core dumps. - */ - -int dump_fpu( struct pt_regs *regs, struct user_i387_struct *fpu ) -{ - struct task_struct *tsk = current; - - if (!used_math()) - return 0; - - unlazy_fpu(tsk); - memcpy(fpu, &tsk->thread.i387.fxsave, sizeof(struct user_i387_struct)); - return 1; -} - -int dump_task_fpu(struct task_struct *tsk, struct user_i387_struct *fpu) -{ - int fpvalid = !!tsk_used_math(tsk); - - if (fpvalid) { - if (tsk == current) - unlazy_fpu(tsk); - memcpy(fpu, &tsk->thread.i387.fxsave, sizeof(struct user_i387_struct)); -} - return fpvalid; -} diff --git a/include/asm-x86/i387.h b/include/asm-x86/i387.h index b2bc0050ce9..de435b9114d 100644 --- a/include/asm-x86/i387.h +++ b/include/asm-x86/i387.h @@ -1 +1,374 @@ -#include "i387_64.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_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 */ diff --git a/include/asm-x86/i387_32.h b/include/asm-x86/i387_32.h deleted file mode 100644 index 9ac2502cdd3..00000000000 --- a/include/asm-x86/i387_32.h +++ /dev/null @@ -1,149 +0,0 @@ -/* - * Copyright (C) 1994 Linus Torvalds - * - * Pentium III FXSR, SSE support - * General FPU state handling cleanups - * Gareth Hughes <gareth@valinux.com>, May 2000 - */ - -#ifndef __ASM_I386_I387_H -#define __ASM_I386_I387_H - -#include <linux/sched.h> -#include <linux/init.h> -#include <linux/kernel_stat.h> -#include <asm/processor.h> -#include <asm/sigcontext.h> -#include <asm/user.h> - -extern void mxcsr_feature_mask_init(void); -extern void init_fpu(struct task_struct *); - -/* - * FPU lazy state save handling... - */ - -/* - * The "nop" is needed to make the instructions the same - * length. - */ -#define restore_fpu(tsk) \ - alternative_input( \ - "nop ; frstor %1", \ - "fxrstor %1", \ - X86_FEATURE_FXSR, \ - "m" ((tsk)->thread.i387.fxsave)) - -extern void kernel_fpu_begin(void); -#define kernel_fpu_end() do { stts(); preempt_enable(); } while(0) - -/* 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; -} - -#define __unlazy_fpu( tsk ) do { \ - if (task_thread_info(tsk)->status & TS_USEDFPU) { \ - __save_init_fpu(tsk); \ - stts(); \ - } else \ - tsk->fpu_counter = 0; \ -} while (0) - -#define __clear_fpu( tsk ) \ -do { \ - if (task_thread_info(tsk)->status & TS_USEDFPU) { \ - asm volatile("fnclex ; fwait"); \ - task_thread_info(tsk)->status &= ~TS_USEDFPU; \ - stts(); \ - } \ -} while (0) - - -/* - * 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(); -} - -#define unlazy_fpu( tsk ) do { \ - preempt_disable(); \ - __unlazy_fpu(tsk); \ - preempt_enable(); \ -} while (0) - -#define clear_fpu( tsk ) do { \ - preempt_disable(); \ - __clear_fpu( tsk ); \ - preempt_enable(); \ -} while (0) - -/* - * FPU state interaction... - */ -extern unsigned short get_fpu_cwd( struct task_struct *tsk ); -extern unsigned short get_fpu_swd( struct task_struct *tsk ); -extern unsigned short get_fpu_mxcsr( struct task_struct *tsk ); -extern asmlinkage void math_state_restore(void); - -/* - * Signal frame handlers... - */ -extern int save_i387( struct _fpstate __user *buf ); -extern int restore_i387( struct _fpstate __user *buf ); - -/* - * 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 ); - -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 ); - -/* - * FPU state for core dumps... - */ -extern int dump_fpu( struct pt_regs *regs, - struct user_i387_struct *fpu ); - -#endif /* __ASM_I386_I387_H */ diff --git a/include/asm-x86/i387_64.h b/include/asm-x86/i387_64.h deleted file mode 100644 index de435b9114d..00000000000 --- 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 */ |