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/sched.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	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(&current->thread.float_regs[0], &current->thread.fsr,
22		       &current->thread.fpqueue[0], &current->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(&current->thread.float_regs[0], &current->thread.fsr,
30		       &current->thread.fpqueue[0], &current->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			      &current->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				      &current->thread.fpqueue[0],
43				      ((sizeof(unsigned long) +
44				      (sizeof(unsigned long *)))*16));
45	clear_used_math();
46	return err;
47}
48
49int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
50{
51	int err;
52
53	if (((unsigned long) fpu) & 3)
54		return -EFAULT;
55
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
68	if (!access_ok(fpu, sizeof(*fpu)))
69		return -EFAULT;
70
71	err = __copy_from_user(&current->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(&current->thread.fpqueue[0],
77					&fpu->si_fpqueue[0],
78					((sizeof(unsigned long) +
79					(sizeof(unsigned long *)))*16));
80	return err;
81}
82
83int 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 = &current_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
100int restore_rwin_state(__siginfo_rwin_t __user *rp)
101{
102	struct thread_info *t = current_thread_info();
103	int i, wsaved, err;
104
105	if (((unsigned long) rp) & 3)
106		return -EFAULT;
107
108	get_user(wsaved, &rp->wsaved);
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}
130