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authorRoland McGrath <roland@redhat.com>2008-01-30 07:31:51 -0500
committerIngo Molnar <mingo@elte.hu>2008-01-30 07:31:51 -0500
commit1eeaed7679eab3666d2d8c964d060c2169b3813b (patch)
tree2c2904e4ee8d75f30d00dd2367b12d37a5e3e55b /arch/x86/ia32
parent4421011120b2304e5c248ae4165a2704588aedf1 (diff)
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>
Diffstat (limited to 'arch/x86/ia32')
-rw-r--r--arch/x86/ia32/fpu32.c181
1 files changed, 0 insertions, 181 deletions
diff --git a/arch/x86/ia32/fpu32.c b/arch/x86/ia32/fpu32.c
deleted file mode 100644
index ae80745f668f..000000000000
--- a/arch/x86/ia32/fpu32.c
+++ /dev/null
@@ -1,181 +0,0 @@
1/*
2 * Copyright 2002 Andi Kleen, SuSE Labs.
3 * FXSAVE<->i387 conversion support. Based on code by Gareth Hughes.
4 * This is used for ptrace, signals and coredumps in 32bit emulation.
5 */
6
7#include <linux/sched.h>
8#include <asm/sigcontext32.h>
9#include <asm/processor.h>
10#include <asm/uaccess.h>
11#include <asm/i387.h>
12
13static inline unsigned short twd_i387_to_fxsr(unsigned short twd)
14{
15 unsigned int tmp; /* to avoid 16 bit prefixes in the code */
16
17 /* Transform each pair of bits into 01 (valid) or 00 (empty) */
18 tmp = ~twd;
19 tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
20 /* and move the valid bits to the lower byte. */
21 tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
22 tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
23 tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
24 return tmp;
25}
26
27#define FPREG_ADDR(f, n) ((void *)&(f)->st_space + (n) * 16);
28#define FP_EXP_TAG_VALID 0
29#define FP_EXP_TAG_ZERO 1
30#define FP_EXP_TAG_SPECIAL 2
31#define FP_EXP_TAG_EMPTY 3
32
33static inline unsigned long twd_fxsr_to_i387(struct i387_fxsave_struct *fxsave)
34{
35 struct _fpxreg *st;
36 unsigned long tos = (fxsave->swd >> 11) & 7;
37 unsigned long twd = (unsigned long) fxsave->twd;
38 unsigned long tag;
39 unsigned long ret = 0xffff0000;
40 int i;
41
42 for (i = 0; i < 8; i++, twd >>= 1) {
43 if (twd & 0x1) {
44 st = FPREG_ADDR(fxsave, (i - tos) & 7);
45
46 switch (st->exponent & 0x7fff) {
47 case 0x7fff:
48 tag = FP_EXP_TAG_SPECIAL;
49 break;
50 case 0x0000:
51 if (!st->significand[0] &&
52 !st->significand[1] &&
53 !st->significand[2] &&
54 !st->significand[3])
55 tag = FP_EXP_TAG_ZERO;
56 else
57 tag = FP_EXP_TAG_SPECIAL;
58 break;
59 default:
60 if (st->significand[3] & 0x8000)
61 tag = FP_EXP_TAG_VALID;
62 else
63 tag = FP_EXP_TAG_SPECIAL;
64 break;
65 }
66 } else {
67 tag = FP_EXP_TAG_EMPTY;
68 }
69 ret |= tag << (2 * i);
70 }
71 return ret;
72}
73
74#define G(num, val) err |= __get_user(val, num + (u32 __user *)buf)
75
76static inline int convert_fxsr_from_user(struct i387_fxsave_struct *fxsave,
77 struct _fpstate_ia32 __user *buf)
78{
79 struct _fpxreg *to;
80 struct _fpreg __user *from;
81 int i, err = 0;
82 u32 v;
83
84 G(0, fxsave->cwd);
85 G(1, fxsave->swd);
86 G(2, fxsave->twd);
87 fxsave->twd = twd_i387_to_fxsr(fxsave->twd);
88 G(3, fxsave->rip);
89 G(4, v);
90 /* cs ignored */
91 fxsave->fop = v>>16;
92 G(5, fxsave->rdp);
93 /* 6: ds ignored */
94 if (err)
95 return -1;
96
97 to = (struct _fpxreg *)&fxsave->st_space[0];
98 from = &buf->_st[0];
99 for (i = 0; i < 8; i++, to++, from++) {
100 if (__copy_from_user(to, from, sizeof(*from)))
101 return -1;
102 }
103 return 0;
104}
105
106#define P(num, val) err |= __put_user(val, num + (u32 __user *)buf)
107
108static inline int convert_fxsr_to_user(struct _fpstate_ia32 __user *buf,
109 struct i387_fxsave_struct *fxsave,
110 struct pt_regs *regs,
111 struct task_struct *tsk)
112{
113 struct _fpreg __user *to;
114 struct _fpxreg *from;
115 int i, err = 0;
116 u16 cs, ds;
117
118 if (tsk == current) {
119 /*
120 * should be actually ds/cs at fpu exception time, but
121 * that information is not available in 64bit mode.
122 */
123 asm("movw %%ds,%0 " : "=r" (ds));
124 asm("movw %%cs,%0 " : "=r" (cs));
125 } else {
126 /* ptrace. task has stopped. */
127 ds = tsk->thread.ds;
128 cs = regs->cs;
129 }
130
131 P(0, (u32)fxsave->cwd | 0xffff0000);
132 P(1, (u32)fxsave->swd | 0xffff0000);
133 P(2, twd_fxsr_to_i387(fxsave));
134 P(3, (u32)fxsave->rip);
135 P(4, cs | ((u32)fxsave->fop) << 16);
136 P(5, fxsave->rdp);
137 P(6, 0xffff0000 | ds);
138
139 if (err)
140 return -1;
141
142 to = &buf->_st[0];
143 from = (struct _fpxreg *) &fxsave->st_space[0];
144 for (i = 0; i < 8; i++, to++, from++) {
145 if (__copy_to_user(to, from, sizeof(*to)))
146 return -1;
147 }
148 return 0;
149}
150
151int restore_i387_ia32(struct task_struct *tsk,
152 struct _fpstate_ia32 __user *buf, int fsave)
153{
154 clear_fpu(tsk);
155 if (!fsave) {
156 if (__copy_from_user(&tsk->thread.i387.fxsave,
157 &buf->_fxsr_env[0],
158 sizeof(struct i387_fxsave_struct)))
159 return -1;
160 tsk->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
161 set_stopped_child_used_math(tsk);
162 }
163 return convert_fxsr_from_user(&tsk->thread.i387.fxsave, buf);
164}
165
166int save_i387_ia32(struct task_struct *tsk, struct _fpstate_ia32 __user *buf,
167 struct pt_regs *regs, int fsave)
168{
169 int err = 0;
170
171 init_fpu(tsk);
172 if (convert_fxsr_to_user(buf, &tsk->thread.i387.fxsave, regs, tsk))
173 return -1;
174 if (fsave)
175 return 0;
176 err |= __put_user(tsk->thread.i387.fxsave.swd, &buf->status);
177 err |= __put_user(X86_FXSR_MAGIC, &buf->magic);
178 err |= __copy_to_user(&buf->_fxsr_env[0], &tsk->thread.i387.fxsave,
179 sizeof(struct i387_fxsave_struct));
180 return err ? -1 : 1;
181}
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