x86: x86 i387 cleanup
This removes all the old code that is no longer used after the i387 unification and cleanup. The i387_64.h is renamed to i387.h with no changes, but since it replaces the nonempty one-line stub i387.h it looks like a big diff and not a rename. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Цей коміт міститься в:
Roland McGrath
зафіксовано
Ingo Molnar
Ingo Molnar
джерело
4421011120
коміт
1eeaed7679
@@ -1,181 +0,0 @@
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/*
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* Copyright 2002 Andi Kleen, SuSE Labs.
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* FXSAVE<->i387 conversion support. Based on code by Gareth Hughes.
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* This is used for ptrace, signals and coredumps in 32bit emulation.
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*/
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#include <linux/sched.h>
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#include <asm/sigcontext32.h>
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#include <asm/processor.h>
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#include <asm/uaccess.h>
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#include <asm/i387.h>
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static inline unsigned short twd_i387_to_fxsr(unsigned short twd)
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{
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unsigned int tmp; /* to avoid 16 bit prefixes in the code */
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/* Transform each pair of bits into 01 (valid) or 00 (empty) */
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tmp = ~twd;
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tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
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/* and move the valid bits to the lower byte. */
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tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
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tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
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tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
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return tmp;
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}
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#define FPREG_ADDR(f, n) ((void *)&(f)->st_space + (n) * 16);
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#define FP_EXP_TAG_VALID 0
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#define FP_EXP_TAG_ZERO 1
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#define FP_EXP_TAG_SPECIAL 2
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#define FP_EXP_TAG_EMPTY 3
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static inline unsigned long twd_fxsr_to_i387(struct i387_fxsave_struct *fxsave)
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{
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struct _fpxreg *st;
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unsigned long tos = (fxsave->swd >> 11) & 7;
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unsigned long twd = (unsigned long) fxsave->twd;
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unsigned long tag;
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unsigned long ret = 0xffff0000;
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int i;
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for (i = 0; i < 8; i++, twd >>= 1) {
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if (twd & 0x1) {
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st = FPREG_ADDR(fxsave, (i - tos) & 7);
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switch (st->exponent & 0x7fff) {
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case 0x7fff:
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tag = FP_EXP_TAG_SPECIAL;
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break;
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case 0x0000:
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if (!st->significand[0] &&
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!st->significand[1] &&
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!st->significand[2] &&
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!st->significand[3])
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tag = FP_EXP_TAG_ZERO;
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else
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tag = FP_EXP_TAG_SPECIAL;
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break;
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default:
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if (st->significand[3] & 0x8000)
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tag = FP_EXP_TAG_VALID;
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else
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tag = FP_EXP_TAG_SPECIAL;
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break;
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}
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} else {
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tag = FP_EXP_TAG_EMPTY;
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}
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ret |= tag << (2 * i);
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}
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return ret;
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}
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#define G(num, val) err |= __get_user(val, num + (u32 __user *)buf)
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static inline int convert_fxsr_from_user(struct i387_fxsave_struct *fxsave,
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struct _fpstate_ia32 __user *buf)
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{
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struct _fpxreg *to;
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struct _fpreg __user *from;
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int i, err = 0;
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u32 v;
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G(0, fxsave->cwd);
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G(1, fxsave->swd);
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G(2, fxsave->twd);
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fxsave->twd = twd_i387_to_fxsr(fxsave->twd);
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G(3, fxsave->rip);
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G(4, v);
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/* cs ignored */
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fxsave->fop = v>>16;
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G(5, fxsave->rdp);
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/* 6: ds ignored */
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if (err)
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return -1;
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to = (struct _fpxreg *)&fxsave->st_space[0];
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from = &buf->_st[0];
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for (i = 0; i < 8; i++, to++, from++) {
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if (__copy_from_user(to, from, sizeof(*from)))
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return -1;
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}
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return 0;
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}
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#define P(num, val) err |= __put_user(val, num + (u32 __user *)buf)
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static inline int convert_fxsr_to_user(struct _fpstate_ia32 __user *buf,
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struct i387_fxsave_struct *fxsave,
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struct pt_regs *regs,
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struct task_struct *tsk)
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{
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struct _fpreg __user *to;
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struct _fpxreg *from;
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int i, err = 0;
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u16 cs, ds;
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if (tsk == current) {
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/*
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* should be actually ds/cs at fpu exception time, but
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* that information is not available in 64bit mode.
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*/
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asm("movw %%ds,%0 " : "=r" (ds));
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asm("movw %%cs,%0 " : "=r" (cs));
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} else {
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/* ptrace. task has stopped. */
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ds = tsk->thread.ds;
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cs = regs->cs;
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}
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P(0, (u32)fxsave->cwd | 0xffff0000);
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P(1, (u32)fxsave->swd | 0xffff0000);
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P(2, twd_fxsr_to_i387(fxsave));
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P(3, (u32)fxsave->rip);
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P(4, cs | ((u32)fxsave->fop) << 16);
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P(5, fxsave->rdp);
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P(6, 0xffff0000 | ds);
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if (err)
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return -1;
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to = &buf->_st[0];
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from = (struct _fpxreg *) &fxsave->st_space[0];
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for (i = 0; i < 8; i++, to++, from++) {
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if (__copy_to_user(to, from, sizeof(*to)))
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return -1;
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}
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return 0;
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}
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int restore_i387_ia32(struct task_struct *tsk,
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struct _fpstate_ia32 __user *buf, int fsave)
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{
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clear_fpu(tsk);
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if (!fsave) {
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if (__copy_from_user(&tsk->thread.i387.fxsave,
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&buf->_fxsr_env[0],
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sizeof(struct i387_fxsave_struct)))
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return -1;
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tsk->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
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set_stopped_child_used_math(tsk);
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}
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return convert_fxsr_from_user(&tsk->thread.i387.fxsave, buf);
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}
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int save_i387_ia32(struct task_struct *tsk, struct _fpstate_ia32 __user *buf,
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struct pt_regs *regs, int fsave)
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{
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int err = 0;
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init_fpu(tsk);
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if (convert_fxsr_to_user(buf, &tsk->thread.i387.fxsave, regs, tsk))
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return -1;
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if (fsave)
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return 0;
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err |= __put_user(tsk->thread.i387.fxsave.swd, &buf->status);
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err |= __put_user(X86_FXSR_MAGIC, &buf->magic);
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err |= __copy_to_user(&buf->_fxsr_env[0], &tsk->thread.i387.fxsave,
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sizeof(struct i387_fxsave_struct));
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return err ? -1 : 1;
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}
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