1#include <linux/kernel.h>
2#include <linux/types.h>
3#include <linux/thread_info.h>
4#include <linux/uaccess.h>
5#include <linux/errno.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	unsigned long *fpregs = current_thread_info()->fpregs;
17	unsigned long fprs;
18	int err = 0;
19
20	fprs = current_thread_info()->fpsaved[0];
21	if (fprs & FPRS_DL)
22		err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
23				    (sizeof(unsigned int) * 32));
24	if (fprs & FPRS_DU)
25		err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
26				    (sizeof(unsigned int) * 32));
27	err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
28	err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
29	err |= __put_user(fprs, &fpu->si_fprs);
30
31	return err;
32}
33
34int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
35{
36	unsigned long *fpregs = current_thread_info()->fpregs;
37	unsigned long fprs;
38	int err;
39
40	if (((unsigned long) fpu) & 7)
41		return -EFAULT;
42
43	err = get_user(fprs, &fpu->si_fprs);
44	fprs_write(0);
45	regs->tstate &= ~TSTATE_PEF;
46	if (fprs & FPRS_DL)
47		err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
48		       	       (sizeof(unsigned int) * 32));
49	if (fprs & FPRS_DU)
50		err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
51		       	       (sizeof(unsigned int) * 32));
52	err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
53	err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
54	current_thread_info()->fpsaved[0] |= fprs;
55	return err;
56}
57
58int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
59{
60	int i, err = __put_user(wsaved, &rwin->wsaved);
61
62	for (i = 0; i < wsaved; i++) {
63		struct reg_window *rp = &current_thread_info()->reg_window[i];
64		unsigned long fp = current_thread_info()->rwbuf_stkptrs[i];
65
66		err |= copy_to_user(&rwin->reg_window[i], rp,
67				    sizeof(struct reg_window));
68		err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
69	}
70	return err;
71}
72
73int restore_rwin_state(__siginfo_rwin_t __user *rp)
74{
75	struct thread_info *t = current_thread_info();
76	int i, wsaved, err;
77
78	if (((unsigned long) rp) & 7)
79		return -EFAULT;
80
81	get_user(wsaved, &rp->wsaved);
82	if (wsaved > NSWINS)
83		return -EFAULT;
84
85	err = 0;
86	for (i = 0; i < wsaved; i++) {
87		err |= copy_from_user(&t->reg_window[i],
88				      &rp->reg_window[i],
89				      sizeof(struct reg_window));
90		err |= __get_user(t->rwbuf_stkptrs[i],
91				  &rp->rwbuf_stkptrs[i]);
92	}
93	if (err)
94		return err;
95
96	set_thread_wsaved(wsaved);
97	synchronize_user_stack();
98	if (get_thread_wsaved())
99		return -EFAULT;
100	return 0;
101}
102