1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/kernel.h>
3 #include <linux/types.h>
4 #include <linux/thread_info.h>
5 #include <linux/uaccess.h>
6 #include <linux/errno.h>
7
8 #include <asm/sigcontext.h>
9 #include <asm/fpumacro.h>
10 #include <asm/ptrace.h>
11 #include <asm/switch_to.h>
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
41 if (((unsigned long) fpu) & 7)
42 return -EFAULT;
43
44 err = get_user(fprs, &fpu->si_fprs);
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
79 if (((unsigned long) rp) & 7)
80 return -EFAULT;
81
82 get_user(wsaved, &rp->wsaved);
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 }
103
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