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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 | ||
40 | err = __get_user(fprs, &fpu->si_fprs); | |
41 | fprs_write(0); | |
42 | regs->tstate &= ~TSTATE_PEF; | |
43 | if (fprs & FPRS_DL) | |
44 | err |= copy_from_user(fpregs, &fpu->si_float_regs[0], | |
45 | (sizeof(unsigned int) * 32)); | |
46 | if (fprs & FPRS_DU) | |
47 | err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32], | |
48 | (sizeof(unsigned int) * 32)); | |
49 | err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
50 | err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
51 | current_thread_info()->fpsaved[0] |= fprs; | |
52 | return err; | |
53 | } | |
54 | ||
55 | int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin) | |
56 | { | |
57 | int i, err = __put_user(wsaved, &rwin->wsaved); | |
58 | ||
59 | for (i = 0; i < wsaved; i++) { | |
60 | struct reg_window *rp = ¤t_thread_info()->reg_window[i]; | |
61 | unsigned long fp = current_thread_info()->rwbuf_stkptrs[i]; | |
62 | ||
63 | err |= copy_to_user(&rwin->reg_window[i], rp, | |
64 | sizeof(struct reg_window)); | |
65 | err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]); | |
66 | } | |
67 | return err; | |
68 | } | |
69 | ||
70 | int restore_rwin_state(__siginfo_rwin_t __user *rp) | |
71 | { | |
72 | struct thread_info *t = current_thread_info(); | |
73 | int i, wsaved, err; | |
74 | ||
75 | __get_user(wsaved, &rp->wsaved); | |
76 | if (wsaved > NSWINS) | |
77 | return -EFAULT; | |
78 | ||
79 | err = 0; | |
80 | for (i = 0; i < wsaved; i++) { | |
81 | err |= copy_from_user(&t->reg_window[i], | |
82 | &rp->reg_window[i], | |
83 | sizeof(struct reg_window)); | |
84 | err |= __get_user(t->rwbuf_stkptrs[i], | |
85 | &rp->rwbuf_stkptrs[i]); | |
86 | } | |
87 | if (err) | |
88 | return err; | |
89 | ||
90 | set_thread_wsaved(wsaved); | |
91 | synchronize_user_stack(); | |
92 | if (get_thread_wsaved()) | |
93 | return -EFAULT; | |
94 | return 0; | |
95 | } |