Commit | Line | Data |
---|---|---|
5598473a DM |
1 | #include <linux/kernel.h> |
2 | #include <linux/types.h> | |
3 | #include <linux/thread_info.h> | |
4 | #include <linux/uaccess.h> | |
5 | #include <linux/sched.h> | |
6 | ||
7 | #include <asm/sigcontext.h> | |
8 | #include <asm/fpumacro.h> | |
9 | #include <asm/ptrace.h> | |
d550bbd4 | 10 | #include <asm/switch_to.h> |
5598473a DM |
11 | |
12 | #include "sigutil.h" | |
13 | ||
14 | int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
15 | { | |
16 | int err = 0; | |
17 | #ifdef CONFIG_SMP | |
18 | if (test_tsk_thread_flag(current, TIF_USEDFPU)) { | |
19 | put_psr(get_psr() | PSR_EF); | |
20 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
21 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
22 | regs->psr &= ~(PSR_EF); | |
23 | clear_tsk_thread_flag(current, TIF_USEDFPU); | |
24 | } | |
25 | #else | |
26 | if (current == last_task_used_math) { | |
27 | put_psr(get_psr() | PSR_EF); | |
28 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
29 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
30 | last_task_used_math = NULL; | |
31 | regs->psr &= ~(PSR_EF); | |
32 | } | |
33 | #endif | |
34 | err |= __copy_to_user(&fpu->si_float_regs[0], | |
35 | ¤t->thread.float_regs[0], | |
36 | (sizeof(unsigned long) * 32)); | |
37 | err |= __put_user(current->thread.fsr, &fpu->si_fsr); | |
38 | err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth); | |
39 | if (current->thread.fpqdepth != 0) | |
40 | err |= __copy_to_user(&fpu->si_fpqueue[0], | |
41 | ¤t->thread.fpqueue[0], | |
42 | ((sizeof(unsigned long) + | |
43 | (sizeof(unsigned long *)))*16)); | |
44 | clear_used_math(); | |
45 | return err; | |
46 | } | |
47 | ||
48 | int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
49 | { | |
50 | int err; | |
51 | #ifdef CONFIG_SMP | |
52 | if (test_tsk_thread_flag(current, TIF_USEDFPU)) | |
53 | regs->psr &= ~PSR_EF; | |
54 | #else | |
55 | if (current == last_task_used_math) { | |
56 | last_task_used_math = NULL; | |
57 | regs->psr &= ~PSR_EF; | |
58 | } | |
59 | #endif | |
60 | set_used_math(); | |
61 | clear_tsk_thread_flag(current, TIF_USEDFPU); | |
62 | ||
63 | if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu))) | |
64 | return -EFAULT; | |
65 | ||
66 | err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0], | |
67 | (sizeof(unsigned long) * 32)); | |
68 | err |= __get_user(current->thread.fsr, &fpu->si_fsr); | |
69 | err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth); | |
70 | if (current->thread.fpqdepth != 0) | |
71 | err |= __copy_from_user(¤t->thread.fpqueue[0], | |
72 | &fpu->si_fpqueue[0], | |
73 | ((sizeof(unsigned long) + | |
74 | (sizeof(unsigned long *)))*16)); | |
75 | return err; | |
76 | } | |
77 | ||
78 | int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin) | |
79 | { | |
80 | int i, err = __put_user(wsaved, &rwin->wsaved); | |
81 | ||
82 | for (i = 0; i < wsaved; i++) { | |
83 | struct reg_window32 *rp; | |
84 | unsigned long fp; | |
85 | ||
86 | rp = ¤t_thread_info()->reg_window[i]; | |
87 | fp = current_thread_info()->rwbuf_stkptrs[i]; | |
88 | err |= copy_to_user(&rwin->reg_window[i], rp, | |
89 | sizeof(struct reg_window32)); | |
90 | err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]); | |
91 | } | |
92 | return err; | |
93 | } | |
94 | ||
95 | int restore_rwin_state(__siginfo_rwin_t __user *rp) | |
96 | { | |
97 | struct thread_info *t = current_thread_info(); | |
98 | int i, wsaved, err; | |
99 | ||
100 | __get_user(wsaved, &rp->wsaved); | |
101 | if (wsaved > NSWINS) | |
102 | return -EFAULT; | |
103 | ||
104 | err = 0; | |
105 | for (i = 0; i < wsaved; i++) { | |
106 | err |= copy_from_user(&t->reg_window[i], | |
107 | &rp->reg_window[i], | |
108 | sizeof(struct reg_window32)); | |
109 | err |= __get_user(t->rwbuf_stkptrs[i], | |
110 | &rp->rwbuf_stkptrs[i]); | |
111 | } | |
112 | if (err) | |
113 | return err; | |
114 | ||
115 | t->w_saved = wsaved; | |
116 | synchronize_user_stack(); | |
117 | if (t->w_saved) | |
118 | return -EFAULT; | |
119 | return 0; | |
120 | ||
121 | } |