diff options
-rw-r--r-- | arch/x86/kernel/signal_64.c | 53 | ||||
-rw-r--r-- | include/asm-x86/i387.h | 54 |
2 files changed, 53 insertions, 54 deletions
diff --git a/arch/x86/kernel/signal_64.c b/arch/x86/kernel/signal_64.c index 47c3d249e638..b45ef8ddd651 100644 --- a/arch/x86/kernel/signal_64.c +++ b/arch/x86/kernel/signal_64.c | |||
@@ -53,6 +53,59 @@ sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, | |||
53 | return do_sigaltstack(uss, uoss, regs->sp); | 53 | return do_sigaltstack(uss, uoss, regs->sp); |
54 | } | 54 | } |
55 | 55 | ||
56 | /* | ||
57 | * Signal frame handlers. | ||
58 | */ | ||
59 | |||
60 | static inline int save_i387(struct _fpstate __user *buf) | ||
61 | { | ||
62 | struct task_struct *tsk = current; | ||
63 | int err = 0; | ||
64 | |||
65 | BUILD_BUG_ON(sizeof(struct user_i387_struct) != | ||
66 | sizeof(tsk->thread.xstate->fxsave)); | ||
67 | |||
68 | if ((unsigned long)buf % 16) | ||
69 | printk("save_i387: bad fpstate %p\n", buf); | ||
70 | |||
71 | if (!used_math()) | ||
72 | return 0; | ||
73 | clear_used_math(); /* trigger finit */ | ||
74 | if (task_thread_info(tsk)->status & TS_USEDFPU) { | ||
75 | err = save_i387_checking((struct i387_fxsave_struct __user *) | ||
76 | buf); | ||
77 | if (err) | ||
78 | return err; | ||
79 | task_thread_info(tsk)->status &= ~TS_USEDFPU; | ||
80 | stts(); | ||
81 | } else { | ||
82 | if (__copy_to_user(buf, &tsk->thread.xstate->fxsave, | ||
83 | sizeof(struct i387_fxsave_struct))) | ||
84 | return -1; | ||
85 | } | ||
86 | return 1; | ||
87 | } | ||
88 | |||
89 | /* | ||
90 | * This restores directly out of user space. Exceptions are handled. | ||
91 | */ | ||
92 | static inline int restore_i387(struct _fpstate __user *buf) | ||
93 | { | ||
94 | struct task_struct *tsk = current; | ||
95 | int err; | ||
96 | |||
97 | if (!used_math()) { | ||
98 | err = init_fpu(tsk); | ||
99 | if (err) | ||
100 | return err; | ||
101 | } | ||
102 | |||
103 | if (!(task_thread_info(current)->status & TS_USEDFPU)) { | ||
104 | clts(); | ||
105 | task_thread_info(current)->status |= TS_USEDFPU; | ||
106 | } | ||
107 | return restore_fpu_checking((__force struct i387_fxsave_struct *)buf); | ||
108 | } | ||
56 | 109 | ||
57 | /* | 110 | /* |
58 | * Do a signal return; undo the signal stack. | 111 | * Do a signal return; undo the signal stack. |
diff --git a/include/asm-x86/i387.h b/include/asm-x86/i387.h index 37672f79dcc8..96fa8449ff11 100644 --- a/include/asm-x86/i387.h +++ b/include/asm-x86/i387.h | |||
@@ -137,60 +137,6 @@ static inline void __save_init_fpu(struct task_struct *tsk) | |||
137 | task_thread_info(tsk)->status &= ~TS_USEDFPU; | 137 | task_thread_info(tsk)->status &= ~TS_USEDFPU; |
138 | } | 138 | } |
139 | 139 | ||
140 | /* | ||
141 | * Signal frame handlers. | ||
142 | */ | ||
143 | |||
144 | static inline int save_i387(struct _fpstate __user *buf) | ||
145 | { | ||
146 | struct task_struct *tsk = current; | ||
147 | int err = 0; | ||
148 | |||
149 | BUILD_BUG_ON(sizeof(struct user_i387_struct) != | ||
150 | sizeof(tsk->thread.xstate->fxsave)); | ||
151 | |||
152 | if ((unsigned long)buf % 16) | ||
153 | printk("save_i387: bad fpstate %p\n", buf); | ||
154 | |||
155 | if (!used_math()) | ||
156 | return 0; | ||
157 | clear_used_math(); /* trigger finit */ | ||
158 | if (task_thread_info(tsk)->status & TS_USEDFPU) { | ||
159 | err = save_i387_checking((struct i387_fxsave_struct __user *) | ||
160 | buf); | ||
161 | if (err) | ||
162 | return err; | ||
163 | task_thread_info(tsk)->status &= ~TS_USEDFPU; | ||
164 | stts(); | ||
165 | } else { | ||
166 | if (__copy_to_user(buf, &tsk->thread.xstate->fxsave, | ||
167 | sizeof(struct i387_fxsave_struct))) | ||
168 | return -1; | ||
169 | } | ||
170 | return 1; | ||
171 | } | ||
172 | |||
173 | /* | ||
174 | * This restores directly out of user space. Exceptions are handled. | ||
175 | */ | ||
176 | static inline int restore_i387(struct _fpstate __user *buf) | ||
177 | { | ||
178 | struct task_struct *tsk = current; | ||
179 | int err; | ||
180 | |||
181 | if (!used_math()) { | ||
182 | err = init_fpu(tsk); | ||
183 | if (err) | ||
184 | return err; | ||
185 | } | ||
186 | |||
187 | if (!(task_thread_info(current)->status & TS_USEDFPU)) { | ||
188 | clts(); | ||
189 | task_thread_info(current)->status |= TS_USEDFPU; | ||
190 | } | ||
191 | return restore_fpu_checking((__force struct i387_fxsave_struct *)buf); | ||
192 | } | ||
193 | |||
194 | #else /* CONFIG_X86_32 */ | 140 | #else /* CONFIG_X86_32 */ |
195 | 141 | ||
196 | extern void finit(void); | 142 | extern void finit(void); |