1#include <linux/kernel.h>
2#include <linux/types.h>
3#include <linux/thread_info.h>
4#include <linux/uaccess.h>
5#include <linux/sched.h>
6
7#include <asm/sigcontext.h>
8#include <asm/fpumacro.h>
9#include <asm/ptrace.h>
10#include <asm/switch_to.h>
11
12#include "sigutil.h"
13
14int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
15{
16	int err = 0;
17#ifdef CONFIG_SMP
18	if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
19		put_psr(get_psr() | PSR_EF);
20		fpsave(&current->thread.float_regs[0], &current->thread.fsr,
21		       &current->thread.fpqueue[0], &current->thread.fpqdepth);
22		regs->psr &= ~(PSR_EF);
23		clear_tsk_thread_flag(current, TIF_USEDFPU);
24	}
25#else
26	if (current == last_task_used_math) {
27		put_psr(get_psr() | PSR_EF);
28		fpsave(&current->thread.float_regs[0], &current->thread.fsr,
29		       &current->thread.fpqueue[0], &current->thread.fpqdepth);
30		last_task_used_math = NULL;
31		regs->psr &= ~(PSR_EF);
32	}
33#endif
34	err |= __copy_to_user(&fpu->si_float_regs[0],
35			      &current->thread.float_regs[0],
36			      (sizeof(unsigned long) * 32));
37	err |= __put_user(current->thread.fsr, &fpu->si_fsr);
38	err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
39	if (current->thread.fpqdepth != 0)
40		err |= __copy_to_user(&fpu->si_fpqueue[0],
41				      &current->thread.fpqueue[0],
42				      ((sizeof(unsigned long) +
43				      (sizeof(unsigned long *)))*16));
44	clear_used_math();
45	return err;
46}
47
48int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
49{
50	int err;
51
52	if (((unsigned long) fpu) & 3)
53		return -EFAULT;
54
55#ifdef CONFIG_SMP
56	if (test_tsk_thread_flag(current, TIF_USEDFPU))
57		regs->psr &= ~PSR_EF;
58#else
59	if (current == last_task_used_math) {
60		last_task_used_math = NULL;
61		regs->psr &= ~PSR_EF;
62	}
63#endif
64	set_used_math();
65	clear_tsk_thread_flag(current, TIF_USEDFPU);
66
67	if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
68		return -EFAULT;
69
70	err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
71			       (sizeof(unsigned long) * 32));
72	err |= __get_user(current->thread.fsr, &fpu->si_fsr);
73	err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
74	if (current->thread.fpqdepth != 0)
75		err |= __copy_from_user(&current->thread.fpqueue[0],
76					&fpu->si_fpqueue[0],
77					((sizeof(unsigned long) +
78					(sizeof(unsigned long *)))*16));
79	return err;
80}
81
82int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
83{
84	int i, err = __put_user(wsaved, &rwin->wsaved);
85
86	for (i = 0; i < wsaved; i++) {
87		struct reg_window32 *rp;
88		unsigned long fp;
89
90		rp = &current_thread_info()->reg_window[i];
91		fp = current_thread_info()->rwbuf_stkptrs[i];
92		err |= copy_to_user(&rwin->reg_window[i], rp,
93				    sizeof(struct reg_window32));
94		err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
95	}
96	return err;
97}
98
99int restore_rwin_state(__siginfo_rwin_t __user *rp)
100{
101	struct thread_info *t = current_thread_info();
102	int i, wsaved, err;
103
104	if (((unsigned long) rp) & 3)
105		return -EFAULT;
106
107	get_user(wsaved, &rp->wsaved);
108	if (wsaved > NSWINS)
109		return -EFAULT;
110
111	err = 0;
112	for (i = 0; i < wsaved; i++) {
113		err |= copy_from_user(&t->reg_window[i],
114				      &rp->reg_window[i],
115				      sizeof(struct reg_window32));
116		err |= __get_user(t->rwbuf_stkptrs[i],
117				  &rp->rwbuf_stkptrs[i]);
118	}
119	if (err)
120		return err;
121
122	t->w_saved = wsaved;
123	synchronize_user_stack();
124	if (t->w_saved)
125		return -EFAULT;
126	return 0;
127
128}
129