diff options
Diffstat (limited to 'old/xenolinux-2.4.16-sparse/arch/xeno/kernel/i387.c')
-rw-r--r-- | old/xenolinux-2.4.16-sparse/arch/xeno/kernel/i387.c | 518 |
1 files changed, 0 insertions, 518 deletions
diff --git a/old/xenolinux-2.4.16-sparse/arch/xeno/kernel/i387.c b/old/xenolinux-2.4.16-sparse/arch/xeno/kernel/i387.c deleted file mode 100644 index 9b8dfb0581..0000000000 --- a/old/xenolinux-2.4.16-sparse/arch/xeno/kernel/i387.c +++ /dev/null @@ -1,518 +0,0 @@ -/* - * linux/arch/i386/kernel/i387.c - * - * Copyright (C) 1994 Linus Torvalds - * - * Pentium III FXSR, SSE support - * General FPU state handling cleanups - * Gareth Hughes <gareth@valinux.com>, May 2000 - */ - -#include <linux/config.h> -#include <linux/sched.h> -#include <asm/processor.h> -#include <asm/i387.h> -#include <asm/math_emu.h> -#include <asm/sigcontext.h> -#include <asm/user.h> -#include <asm/ptrace.h> -#include <asm/uaccess.h> - -#define HAVE_HWFP 1 - -/* - * The _current_ task is using the FPU for the first time - * so initialize it and set the mxcsr to its default - * value at reset if we support XMM instructions and then - * remeber the current task has used the FPU. - */ -void init_fpu(void) -{ - __asm__("fninit"); - if ( cpu_has_xmm ) - load_mxcsr(0x1f80); - - current->used_math = 1; -} - -/* - * FPU lazy state save handling. - */ - -static inline void __save_init_fpu( struct task_struct *tsk ) -{ - if ( cpu_has_fxsr ) { - asm volatile( "fxsave %0 ; fnclex" - : "=m" (tsk->thread.i387.fxsave) ); - } else { - asm volatile( "fnsave %0 ; fwait" - : "=m" (tsk->thread.i387.fsave) ); - } - tsk->flags &= ~PF_USEDFPU; -} - -void save_init_fpu( struct task_struct *tsk ) -{ - __save_init_fpu(tsk); - stts(); -} - -void kernel_fpu_begin(void) -{ - struct task_struct *tsk = current; - - if (tsk->flags & PF_USEDFPU) { - __save_init_fpu(tsk); - return; - } - clts(); -} - -void restore_fpu( struct task_struct *tsk ) -{ - if ( cpu_has_fxsr ) { - asm volatile( "fxrstor %0" - : : "m" (tsk->thread.i387.fxsave) ); - } else { - asm volatile( "frstor %0" - : : "m" (tsk->thread.i387.fsave) ); - } -} - -/* - * FPU tag word conversions. - */ - -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; -} - -static inline unsigned long twd_fxsr_to_i387( struct i387_fxsave_struct *fxsave ) -{ - struct _fpxreg *st = NULL; - unsigned long twd = (unsigned long) fxsave->twd; - unsigned long tag; - unsigned long ret = 0xffff0000; - int i; - -#define FPREG_ADDR(f, n) ((char *)&(f)->st_space + (n) * 16); - - for ( i = 0 ; i < 8 ; i++ ) { - if ( twd & 0x1 ) { - st = (struct _fpxreg *) FPREG_ADDR( fxsave, i ); - - switch ( st->exponent & 0x7fff ) { - case 0x7fff: - tag = 2; /* Special */ - break; - case 0x0000: - if ( !st->significand[0] && - !st->significand[1] && - !st->significand[2] && - !st->significand[3] ) { - tag = 1; /* Zero */ - } else { - tag = 2; /* Special */ - } - break; - default: - if ( st->significand[3] & 0x8000 ) { - tag = 0; /* Valid */ - } else { - tag = 2; /* Special */ - } - break; - } - } else { - tag = 3; /* Empty */ - } - ret |= (tag << (2 * i)); - twd = twd >> 1; - } - return ret; -} - -/* - * FPU state interaction. - */ - -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; - } -} - -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; - } -} - -unsigned short get_fpu_twd( struct task_struct *tsk ) -{ - if ( cpu_has_fxsr ) { - return tsk->thread.i387.fxsave.twd; - } else { - return (unsigned short)tsk->thread.i387.fsave.twd; - } -} - -unsigned short get_fpu_mxcsr( struct task_struct *tsk ) -{ - if ( cpu_has_xmm ) { - return tsk->thread.i387.fxsave.mxcsr; - } else { - return 0x1f80; - } -} - -void set_fpu_cwd( struct task_struct *tsk, unsigned short cwd ) -{ - if ( cpu_has_fxsr ) { - tsk->thread.i387.fxsave.cwd = cwd; - } else { - tsk->thread.i387.fsave.cwd = ((long)cwd | 0xffff0000); - } -} - -void set_fpu_swd( struct task_struct *tsk, unsigned short swd ) -{ - if ( cpu_has_fxsr ) { - tsk->thread.i387.fxsave.swd = swd; - } else { - tsk->thread.i387.fsave.swd = ((long)swd | 0xffff0000); - } -} - -void set_fpu_twd( struct task_struct *tsk, unsigned short twd ) -{ - if ( cpu_has_fxsr ) { - tsk->thread.i387.fxsave.twd = twd_i387_to_fxsr(twd); - } else { - tsk->thread.i387.fsave.twd = ((long)twd | 0xffff0000); - } -} - -void set_fpu_mxcsr( struct task_struct *tsk, unsigned short mxcsr ) -{ - if ( cpu_has_xmm ) { - tsk->thread.i387.fxsave.mxcsr = (mxcsr & 0xffbf); - } -} - -/* - * FXSR floating point environment conversions. - */ - -static inline int convert_fxsr_to_user( struct _fpstate *buf, - struct i387_fxsave_struct *fxsave ) -{ - unsigned long env[7]; - struct _fpreg *to; - struct _fpxreg *from; - int i; - - env[0] = (unsigned long)fxsave->cwd | 0xffff0000; - env[1] = (unsigned long)fxsave->swd | 0xffff0000; - env[2] = twd_fxsr_to_i387(fxsave); - env[3] = fxsave->fip; - env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16); - env[5] = fxsave->foo; - env[6] = fxsave->fos; - - if ( __copy_to_user( buf, env, 7 * sizeof(unsigned long) ) ) - 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; -} - -static inline int convert_fxsr_from_user( struct i387_fxsave_struct *fxsave, - struct _fpstate *buf ) -{ - unsigned long env[7]; - struct _fpxreg *to; - struct _fpreg *from; - int i; - - if ( __copy_from_user( env, buf, 7 * sizeof(long) ) ) - return 1; - - fxsave->cwd = (unsigned short)(env[0] & 0xffff); - fxsave->swd = (unsigned short)(env[1] & 0xffff); - fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff)); - fxsave->fip = env[3]; - fxsave->fop = (unsigned short)((env[4] & 0xffff0000) >> 16); - fxsave->fcs = (env[4] & 0xffff); - fxsave->foo = env[5]; - fxsave->fos = env[6]; - - 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; -} - -/* - * Signal frame handlers. - */ - -static inline int save_i387_fsave( struct _fpstate *buf ) -{ - struct task_struct *tsk = current; - - unlazy_fpu( tsk ); - tsk->thread.i387.fsave.status = tsk->thread.i387.fsave.swd; - if ( __copy_to_user( buf, &tsk->thread.i387.fsave, - sizeof(struct i387_fsave_struct) ) ) - return -1; - return 1; -} - -static inline int save_i387_fxsave( struct _fpstate *buf ) -{ - struct task_struct *tsk = current; - int err = 0; - - unlazy_fpu( tsk ); - - if ( convert_fxsr_to_user( buf, &tsk->thread.i387.fxsave ) ) - return -1; - - err |= __put_user( tsk->thread.i387.fxsave.swd, &buf->status ); - err |= __put_user( X86_FXSR_MAGIC, &buf->magic ); - if ( err ) - return -1; - - if ( __copy_to_user( &buf->_fxsr_env[0], &tsk->thread.i387.fxsave, - sizeof(struct i387_fxsave_struct) ) ) - return -1; - return 1; -} - -int save_i387( struct _fpstate *buf ) -{ - if ( !current->used_math ) - return 0; - - /* This will cause a "finit" to be triggered by the next - * attempted FPU operation by the 'current' process. - */ - current->used_math = 0; - - if ( HAVE_HWFP ) { - if ( cpu_has_fxsr ) { - return save_i387_fxsave( buf ); - } else { - return save_i387_fsave( buf ); - } - } else { - return save_i387_soft( ¤t->thread.i387.soft, buf ); - } -} - -static inline int restore_i387_fsave( struct _fpstate *buf ) -{ - struct task_struct *tsk = current; - clear_fpu( tsk ); - return __copy_from_user( &tsk->thread.i387.fsave, buf, - sizeof(struct i387_fsave_struct) ); -} - -static inline int restore_i387_fxsave( struct _fpstate *buf ) -{ - struct task_struct *tsk = current; - clear_fpu( tsk ); - if ( __copy_from_user( &tsk->thread.i387.fxsave, &buf->_fxsr_env[0], - sizeof(struct i387_fxsave_struct) ) ) - return 1; - /* mxcsr bit 6 and 31-16 must be zero for security reasons */ - tsk->thread.i387.fxsave.mxcsr &= 0xffbf; - return convert_fxsr_from_user( &tsk->thread.i387.fxsave, buf ); -} - -int restore_i387( struct _fpstate *buf ) -{ - int err; - - if ( HAVE_HWFP ) { - if ( cpu_has_fxsr ) { - err = restore_i387_fxsave( buf ); - } else { - err = restore_i387_fsave( buf ); - } - } else { - err = restore_i387_soft( ¤t->thread.i387.soft, buf ); - } - current->used_math = 1; - return err; -} - -/* - * ptrace request handlers. - */ - -static inline int get_fpregs_fsave( struct user_i387_struct *buf, - struct task_struct *tsk ) -{ - return __copy_to_user( buf, &tsk->thread.i387.fsave, - sizeof(struct user_i387_struct) ); -} - -static inline int get_fpregs_fxsave( struct user_i387_struct *buf, - struct task_struct *tsk ) -{ - return convert_fxsr_to_user( (struct _fpstate *)buf, - &tsk->thread.i387.fxsave ); -} - -int get_fpregs( struct user_i387_struct *buf, struct task_struct *tsk ) -{ - if ( HAVE_HWFP ) { - if ( cpu_has_fxsr ) { - return get_fpregs_fxsave( buf, tsk ); - } else { - return get_fpregs_fsave( buf, tsk ); - } - } else { - return save_i387_soft( &tsk->thread.i387.soft, - (struct _fpstate *)buf ); - } -} - -static inline int set_fpregs_fsave( struct task_struct *tsk, - struct user_i387_struct *buf ) -{ - return __copy_from_user( &tsk->thread.i387.fsave, buf, - sizeof(struct user_i387_struct) ); -} - -static inline int set_fpregs_fxsave( struct task_struct *tsk, - struct user_i387_struct *buf ) -{ - return convert_fxsr_from_user( &tsk->thread.i387.fxsave, - (struct _fpstate *)buf ); -} - -int set_fpregs( struct task_struct *tsk, struct user_i387_struct *buf ) -{ - if ( HAVE_HWFP ) { - if ( cpu_has_fxsr ) { - return set_fpregs_fxsave( tsk, buf ); - } else { - return set_fpregs_fsave( tsk, buf ); - } - } else { - return restore_i387_soft( &tsk->thread.i387.soft, - (struct _fpstate *)buf ); - } -} - -int get_fpxregs( struct user_fxsr_struct *buf, struct task_struct *tsk ) -{ - if ( cpu_has_fxsr ) { - if (__copy_to_user( (void *)buf, &tsk->thread.i387.fxsave, - sizeof(struct user_fxsr_struct) )) - return -EFAULT; - return 0; - } else { - return -EIO; - } -} - -int set_fpxregs( struct task_struct *tsk, struct user_fxsr_struct *buf ) -{ - if ( cpu_has_fxsr ) { - __copy_from_user( &tsk->thread.i387.fxsave, (void *)buf, - sizeof(struct user_fxsr_struct) ); - /* mxcsr bit 6 and 31-16 must be zero for security reasons */ - tsk->thread.i387.fxsave.mxcsr &= 0xffbf; - return 0; - } else { - return -EIO; - } -} - -/* - * FPU state for core dumps. - */ - -static inline void copy_fpu_fsave( struct task_struct *tsk, - struct user_i387_struct *fpu ) -{ - memcpy( fpu, &tsk->thread.i387.fsave, - sizeof(struct user_i387_struct) ); -} - -static inline void copy_fpu_fxsave( struct task_struct *tsk, - struct user_i387_struct *fpu ) -{ - unsigned short *to; - unsigned short *from; - int i; - - memcpy( fpu, &tsk->thread.i387.fxsave, 7 * sizeof(long) ); - - to = (unsigned short *)&fpu->st_space[0]; - from = (unsigned short *)&tsk->thread.i387.fxsave.st_space[0]; - for ( i = 0 ; i < 8 ; i++, to += 5, from += 8 ) { - memcpy( to, from, 5 * sizeof(unsigned short) ); - } -} - -int dump_fpu( struct pt_regs *regs, struct user_i387_struct *fpu ) -{ - int fpvalid; - struct task_struct *tsk = current; - - fpvalid = tsk->used_math; - if ( fpvalid ) { - unlazy_fpu( tsk ); - if ( cpu_has_fxsr ) { - copy_fpu_fxsave( tsk, fpu ); - } else { - copy_fpu_fsave( tsk, fpu ); - } - } - - return fpvalid; -} - -int dump_extended_fpu( struct pt_regs *regs, struct user_fxsr_struct *fpu ) -{ - int fpvalid; - struct task_struct *tsk = current; - - fpvalid = tsk->used_math && cpu_has_fxsr; - if ( fpvalid ) { - unlazy_fpu( tsk ); - memcpy( fpu, &tsk->thread.i387.fxsave, - sizeof(struct user_fxsr_struct) ); - } - - return fpvalid; -} |