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
15int 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
35int 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
59int 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 = &current_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
74int 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