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	err = __get_user(fprs, &fpu->si_fprs);
 
 
 
41	fprs_write(0);
42	regs->tstate &= ~TSTATE_PEF;
43	if (fprs & FPRS_DL)
44		err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
45		       	       (sizeof(unsigned int) * 32));
46	if (fprs & FPRS_DU)
47		err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
48		       	       (sizeof(unsigned int) * 32));
49	err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
50	err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
51	current_thread_info()->fpsaved[0] |= fprs;
52	return err;
53}
54
55int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
56{
57	int i, err = __put_user(wsaved, &rwin->wsaved);
58
59	for (i = 0; i < wsaved; i++) {
60		struct reg_window *rp = &current_thread_info()->reg_window[i];
61		unsigned long fp = current_thread_info()->rwbuf_stkptrs[i];
62
63		err |= copy_to_user(&rwin->reg_window[i], rp,
64				    sizeof(struct reg_window));
65		err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
66	}
67	return err;
68}
69
70int restore_rwin_state(__siginfo_rwin_t __user *rp)
71{
72	struct thread_info *t = current_thread_info();
73	int i, wsaved, err;
74
75	__get_user(wsaved, &rp->wsaved);
 
 
 
76	if (wsaved > NSWINS)
77		return -EFAULT;
78
79	err = 0;
80	for (i = 0; i < wsaved; i++) {
81		err |= copy_from_user(&t->reg_window[i],
82				      &rp->reg_window[i],
83				      sizeof(struct reg_window));
84		err |= __get_user(t->rwbuf_stkptrs[i],
85				  &rp->rwbuf_stkptrs[i]);
86	}
87	if (err)
88		return err;
89
90	set_thread_wsaved(wsaved);
91	synchronize_user_stack();
92	if (get_thread_wsaved())
93		return -EFAULT;
94	return 0;
95}

  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}