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 
save_fpu_state(struct pt_regs * regs,__siginfo_fpu_t __user * fpu)15 int 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 
restore_fpu_state(struct pt_regs * regs,__siginfo_fpu_t __user * fpu)35 int 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 
save_rwin_state(int wsaved,__siginfo_rwin_t __user * rwin)59 int 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 
restore_rwin_state(__siginfo_rwin_t __user * rp)74 int 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