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author | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 11:14:41 +0200 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 11:14:41 +0200 |
commit | eb102ecb73dffbbbdfccd0ea582f405b0c0cc1fe (patch) | |
tree | 9d7e85a9671331cc7e0f8f0234ffb8f5f6fa91aa /arch/x86_64/kernel/i387.c | |
parent | x86_64: prepare shared kernel/signal.c (diff) | |
download | linux-eb102ecb73dffbbbdfccd0ea582f405b0c0cc1fe.tar.xz linux-eb102ecb73dffbbbdfccd0ea582f405b0c0cc1fe.zip |
x86_64: prepare shared kernel/i387.c
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86_64/kernel/i387.c')
-rw-r--r-- | arch/x86_64/kernel/i387.c | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/arch/x86_64/kernel/i387.c b/arch/x86_64/kernel/i387.c deleted file mode 100644 index 1d58c13bc6bc..000000000000 --- a/arch/x86_64/kernel/i387.c +++ /dev/null @@ -1,151 +0,0 @@ -/* - * linux/arch/x86_64/kernel/i387.c - * - * 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); -} - -/* - * Signal frame handlers. - */ - -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; - stts(); - } else { - if (__copy_to_user(buf, &tsk->thread.i387.fxsave, - sizeof(struct i387_fxsave_struct))) - return -1; - } - return 1; -} - -/* - * 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; -} |