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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
5598473a DM |
2 | #include <linux/kernel.h> |
3 | #include <linux/types.h> | |
4 | #include <linux/thread_info.h> | |
5 | #include <linux/uaccess.h> | |
9ff03b39 | 6 | #include <linux/errno.h> |
5598473a DM |
7 | |
8 | #include <asm/sigcontext.h> | |
9 | #include <asm/fpumacro.h> | |
10 | #include <asm/ptrace.h> | |
d550bbd4 | 11 | #include <asm/switch_to.h> |
5598473a DM |
12 | |
13 | #include "sigutil.h" | |
14 | ||
15 | int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
16 | { | |
17 | unsigned long *fpregs = current_thread_info()->fpregs; | |
18 | unsigned long fprs; | |
19 | int err = 0; | |
20 | ||
21 | fprs = current_thread_info()->fpsaved[0]; | |
22 | if (fprs & FPRS_DL) | |
23 | err |= copy_to_user(&fpu->si_float_regs[0], fpregs, | |
24 | (sizeof(unsigned int) * 32)); | |
25 | if (fprs & FPRS_DU) | |
26 | err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16, | |
27 | (sizeof(unsigned int) * 32)); | |
28 | err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
29 | err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
30 | err |= __put_user(fprs, &fpu->si_fprs); | |
31 | ||
32 | return err; | |
33 | } | |
34 | ||
35 | int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
36 | { | |
37 | unsigned long *fpregs = current_thread_info()->fpregs; | |
38 | unsigned long fprs; | |
39 | int err; | |
40 | ||
d11c2a0d DM |
41 | if (((unsigned long) fpu) & 7) |
42 | return -EFAULT; | |
43 | ||
44 | err = get_user(fprs, &fpu->si_fprs); | |
5598473a DM |
45 | fprs_write(0); |
46 | regs->tstate &= ~TSTATE_PEF; | |
47 | if (fprs & FPRS_DL) | |
48 | err |= copy_from_user(fpregs, &fpu->si_float_regs[0], | |
49 | (sizeof(unsigned int) * 32)); | |
50 | if (fprs & FPRS_DU) | |
51 | err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32], | |
52 | (sizeof(unsigned int) * 32)); | |
53 | err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr); | |
54 | err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr); | |
55 | current_thread_info()->fpsaved[0] |= fprs; | |
56 | return err; | |
57 | } | |
58 | ||
59 | int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin) | |
60 | { | |
61 | int i, err = __put_user(wsaved, &rwin->wsaved); | |
62 | ||
63 | for (i = 0; i < wsaved; i++) { | |
64 | struct reg_window *rp = ¤t_thread_info()->reg_window[i]; | |
65 | unsigned long fp = current_thread_info()->rwbuf_stkptrs[i]; | |
66 | ||
67 | err |= copy_to_user(&rwin->reg_window[i], rp, | |
68 | sizeof(struct reg_window)); | |
69 | err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]); | |
70 | } | |
71 | return err; | |
72 | } | |
73 | ||
74 | int restore_rwin_state(__siginfo_rwin_t __user *rp) | |
75 | { | |
76 | struct thread_info *t = current_thread_info(); | |
77 | int i, wsaved, err; | |
78 | ||
d11c2a0d DM |
79 | if (((unsigned long) rp) & 7) |
80 | return -EFAULT; | |
81 | ||
82 | get_user(wsaved, &rp->wsaved); | |
5598473a DM |
83 | if (wsaved > NSWINS) |
84 | return -EFAULT; | |
85 | ||
86 | err = 0; | |
87 | for (i = 0; i < wsaved; i++) { | |
88 | err |= copy_from_user(&t->reg_window[i], | |
89 | &rp->reg_window[i], | |
90 | sizeof(struct reg_window)); | |
91 | err |= __get_user(t->rwbuf_stkptrs[i], | |
92 | &rp->rwbuf_stkptrs[i]); | |
93 | } | |
94 | if (err) | |
95 | return err; | |
96 | ||
97 | set_thread_wsaved(wsaved); | |
98 | synchronize_user_stack(); | |
99 | if (get_thread_wsaved()) | |
100 | return -EFAULT; | |
101 | return 0; | |
102 | } |