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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> | |
6 | #include <linux/sched.h> | |
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 | int err = 0; | |
18 | #ifdef CONFIG_SMP | |
19 | if (test_tsk_thread_flag(current, TIF_USEDFPU)) { | |
20 | put_psr(get_psr() | PSR_EF); | |
21 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
22 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
23 | regs->psr &= ~(PSR_EF); | |
24 | clear_tsk_thread_flag(current, TIF_USEDFPU); | |
25 | } | |
26 | #else | |
27 | if (current == last_task_used_math) { | |
28 | put_psr(get_psr() | PSR_EF); | |
29 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
30 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
31 | last_task_used_math = NULL; | |
32 | regs->psr &= ~(PSR_EF); | |
33 | } | |
34 | #endif | |
35 | err |= __copy_to_user(&fpu->si_float_regs[0], | |
36 | ¤t->thread.float_regs[0], | |
37 | (sizeof(unsigned long) * 32)); | |
38 | err |= __put_user(current->thread.fsr, &fpu->si_fsr); | |
39 | err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth); | |
40 | if (current->thread.fpqdepth != 0) | |
41 | err |= __copy_to_user(&fpu->si_fpqueue[0], | |
42 | ¤t->thread.fpqueue[0], | |
43 | ((sizeof(unsigned long) + | |
44 | (sizeof(unsigned long *)))*16)); | |
45 | clear_used_math(); | |
46 | return err; | |
47 | } | |
48 | ||
49 | int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
50 | { | |
51 | int err; | |
d11c2a0d DM |
52 | |
53 | if (((unsigned long) fpu) & 3) | |
54 | return -EFAULT; | |
55 | ||
5598473a DM |
56 | #ifdef CONFIG_SMP |
57 | if (test_tsk_thread_flag(current, TIF_USEDFPU)) | |
58 | regs->psr &= ~PSR_EF; | |
59 | #else | |
60 | if (current == last_task_used_math) { | |
61 | last_task_used_math = NULL; | |
62 | regs->psr &= ~PSR_EF; | |
63 | } | |
64 | #endif | |
65 | set_used_math(); | |
66 | clear_tsk_thread_flag(current, TIF_USEDFPU); | |
67 | ||
96d4f267 | 68 | if (!access_ok(fpu, sizeof(*fpu))) |
5598473a DM |
69 | return -EFAULT; |
70 | ||
71 | err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0], | |
72 | (sizeof(unsigned long) * 32)); | |
73 | err |= __get_user(current->thread.fsr, &fpu->si_fsr); | |
74 | err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth); | |
75 | if (current->thread.fpqdepth != 0) | |
76 | err |= __copy_from_user(¤t->thread.fpqueue[0], | |
77 | &fpu->si_fpqueue[0], | |
78 | ((sizeof(unsigned long) + | |
79 | (sizeof(unsigned long *)))*16)); | |
80 | return err; | |
81 | } | |
82 | ||
83 | int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin) | |
84 | { | |
85 | int i, err = __put_user(wsaved, &rwin->wsaved); | |
86 | ||
87 | for (i = 0; i < wsaved; i++) { | |
88 | struct reg_window32 *rp; | |
89 | unsigned long fp; | |
90 | ||
91 | rp = ¤t_thread_info()->reg_window[i]; | |
92 | fp = current_thread_info()->rwbuf_stkptrs[i]; | |
93 | err |= copy_to_user(&rwin->reg_window[i], rp, | |
94 | sizeof(struct reg_window32)); | |
95 | err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]); | |
96 | } | |
97 | return err; | |
98 | } | |
99 | ||
100 | int restore_rwin_state(__siginfo_rwin_t __user *rp) | |
101 | { | |
102 | struct thread_info *t = current_thread_info(); | |
103 | int i, wsaved, err; | |
104 | ||
d11c2a0d DM |
105 | if (((unsigned long) rp) & 3) |
106 | return -EFAULT; | |
107 | ||
108 | get_user(wsaved, &rp->wsaved); | |
5598473a DM |
109 | if (wsaved > NSWINS) |
110 | return -EFAULT; | |
111 | ||
112 | err = 0; | |
113 | for (i = 0; i < wsaved; i++) { | |
114 | err |= copy_from_user(&t->reg_window[i], | |
115 | &rp->reg_window[i], | |
116 | sizeof(struct reg_window32)); | |
117 | err |= __get_user(t->rwbuf_stkptrs[i], | |
118 | &rp->rwbuf_stkptrs[i]); | |
119 | } | |
120 | if (err) | |
121 | return err; | |
122 | ||
123 | t->w_saved = wsaved; | |
124 | synchronize_user_stack(); | |
125 | if (t->w_saved) | |
126 | return -EFAULT; | |
127 | return 0; | |
128 | ||
129 | } |