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5598473a DM |
1 | #include <linux/kernel.h> |
2 | #include <linux/types.h> | |
3 | #include <linux/thread_info.h> | |
4 | #include <linux/uaccess.h> | |
9ff03b39 | 5 | #include <linux/errno.h> |
5598473a DM |
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 | unsigned long *fpregs = current_thread_info()->fpregs; | |
17 | unsigned long fprs; | |
18 | int err = 0; | |
19 | ||
20 | fprs = current_thread_info()->fpsaved[0]; | |
21 | if (fprs & FPRS_DL) | |
22 | err |= copy_to_user(&fpu->si_float_regs[0], fpregs, | |
23 | (sizeof(unsigned int) * 32)); | |
24 | if (fprs & FPRS_DU) | |
25 | err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16, | |
26 | (sizeof(unsigned int) * 32)); | |
27 | err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
28 | err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
29 | err |= __put_user(fprs, &fpu->si_fprs); | |
30 | ||
31 | return err; | |
32 | } | |
33 | ||
34 | int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
35 | { | |
36 | unsigned long *fpregs = current_thread_info()->fpregs; | |
37 | unsigned long fprs; | |
38 | int err; | |
39 | ||
d11c2a0d DM |
40 | if (((unsigned long) fpu) & 7) |
41 | return -EFAULT; | |
42 | ||
43 | err = get_user(fprs, &fpu->si_fprs); | |
5598473a DM |
44 | fprs_write(0); |
45 | regs->tstate &= ~TSTATE_PEF; | |
46 | if (fprs & FPRS_DL) | |
47 | err |= copy_from_user(fpregs, &fpu->si_float_regs[0], | |
48 | (sizeof(unsigned int) * 32)); | |
49 | if (fprs & FPRS_DU) | |
50 | err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32], | |
51 | (sizeof(unsigned int) * 32)); | |
52 | err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
53 | err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
54 | current_thread_info()->fpsaved[0] |= fprs; | |
55 | return err; | |
56 | } | |
57 | ||
58 | int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin) | |
59 | { | |
60 | int i, err = __put_user(wsaved, &rwin->wsaved); | |
61 | ||
62 | for (i = 0; i < wsaved; i++) { | |
63 | struct reg_window *rp = ¤t_thread_info()->reg_window[i]; | |
64 | unsigned long fp = current_thread_info()->rwbuf_stkptrs[i]; | |
65 | ||
66 | err |= copy_to_user(&rwin->reg_window[i], rp, | |
67 | sizeof(struct reg_window)); | |
68 | err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]); | |
69 | } | |
70 | return err; | |
71 | } | |
72 | ||
73 | int restore_rwin_state(__siginfo_rwin_t __user *rp) | |
74 | { | |
75 | struct thread_info *t = current_thread_info(); | |
76 | int i, wsaved, err; | |
77 | ||
d11c2a0d DM |
78 | if (((unsigned long) rp) & 7) |
79 | return -EFAULT; | |
80 | ||
81 | get_user(wsaved, &rp->wsaved); | |
5598473a DM |
82 | if (wsaved > NSWINS) |
83 | return -EFAULT; | |
84 | ||
85 | err = 0; | |
86 | for (i = 0; i < wsaved; i++) { | |
87 | err |= copy_from_user(&t->reg_window[i], | |
88 | &rp->reg_window[i], | |
89 | sizeof(struct reg_window)); | |
90 | err |= __get_user(t->rwbuf_stkptrs[i], | |
91 | &rp->rwbuf_stkptrs[i]); | |
92 | } | |
93 | if (err) | |
94 | return err; | |
95 | ||
96 | set_thread_wsaved(wsaved); | |
97 | synchronize_user_stack(); | |
98 | if (get_thread_wsaved()) | |
99 | return -EFAULT; | |
100 | return 0; | |
101 | } |