1 // SPDX-License-Identifier: GPL-2.0-or-later
2 
3 #include <linux/regset.h>
4 
5 #include <asm/switch_to.h>
6 
7 #include "ptrace-decl.h"
8 
9 /*
10  * Regardless of transactions, 'fp_state' holds the current running
11  * value of all FPR registers and 'ckfp_state' holds the last checkpointed
12  * value of all FPR registers for the current transaction.
13  *
14  * Userspace interface buffer layout:
15  *
16  * struct data {
17  *	u64	fpr[32];
18  *	u64	fpscr;
19  * };
20  */
fpr_get(struct task_struct * target,const struct user_regset * regset,struct membuf to)21 int fpr_get(struct task_struct *target, const struct user_regset *regset,
22 	    struct membuf to)
23 {
24 	u64 buf[33];
25 	int i;
26 
27 	flush_fp_to_thread(target);
28 
29 	/* copy to local buffer then write that out */
30 	for (i = 0; i < 32 ; i++)
31 		buf[i] = target->thread.TS_FPR(i);
32 	buf[32] = target->thread.fp_state.fpscr;
33 	return membuf_write(&to, buf, 33 * sizeof(u64));
34 }
35 
36 /*
37  * Regardless of transactions, 'fp_state' holds the current running
38  * value of all FPR registers and 'ckfp_state' holds the last checkpointed
39  * value of all FPR registers for the current transaction.
40  *
41  * Userspace interface buffer layout:
42  *
43  * struct data {
44  *	u64	fpr[32];
45  *	u64	fpscr;
46  * };
47  *
48  */
fpr_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)49 int fpr_set(struct task_struct *target, const struct user_regset *regset,
50 	    unsigned int pos, unsigned int count,
51 	    const void *kbuf, const void __user *ubuf)
52 {
53 	u64 buf[33];
54 	int i;
55 
56 	flush_fp_to_thread(target);
57 
58 	for (i = 0; i < 32 ; i++)
59 		buf[i] = target->thread.TS_FPR(i);
60 	buf[32] = target->thread.fp_state.fpscr;
61 
62 	/* copy to local buffer then write that out */
63 	i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
64 	if (i)
65 		return i;
66 
67 	for (i = 0; i < 32 ; i++)
68 		target->thread.TS_FPR(i) = buf[i];
69 	target->thread.fp_state.fpscr = buf[32];
70 	return 0;
71 }
72 
73 /*
74  * Currently to set and get all the vsx state, you need to call
75  * the fp and VMX calls as well.  This only get/sets the lower 32
76  * 128bit VSX registers.
77  */
78 
vsr_active(struct task_struct * target,const struct user_regset * regset)79 int vsr_active(struct task_struct *target, const struct user_regset *regset)
80 {
81 	flush_vsx_to_thread(target);
82 	return target->thread.used_vsr ? regset->n : 0;
83 }
84 
85 /*
86  * Regardless of transactions, 'fp_state' holds the current running
87  * value of all FPR registers and 'ckfp_state' holds the last
88  * checkpointed value of all FPR registers for the current
89  * transaction.
90  *
91  * Userspace interface buffer layout:
92  *
93  * struct data {
94  *	u64	vsx[32];
95  * };
96  */
vsr_get(struct task_struct * target,const struct user_regset * regset,struct membuf to)97 int vsr_get(struct task_struct *target, const struct user_regset *regset,
98 	    struct membuf to)
99 {
100 	u64 buf[32];
101 	int i;
102 
103 	flush_tmregs_to_thread(target);
104 	flush_fp_to_thread(target);
105 	flush_altivec_to_thread(target);
106 	flush_vsx_to_thread(target);
107 
108 	for (i = 0; i < 32 ; i++)
109 		buf[i] = target->thread.fp_state.fpr[i][TS_VSRLOWOFFSET];
110 
111 	return membuf_write(&to, buf, 32 * sizeof(double));
112 }
113 
114 /*
115  * Regardless of transactions, 'fp_state' holds the current running
116  * value of all FPR registers and 'ckfp_state' holds the last
117  * checkpointed value of all FPR registers for the current
118  * transaction.
119  *
120  * Userspace interface buffer layout:
121  *
122  * struct data {
123  *	u64	vsx[32];
124  * };
125  */
vsr_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)126 int vsr_set(struct task_struct *target, const struct user_regset *regset,
127 	    unsigned int pos, unsigned int count,
128 	    const void *kbuf, const void __user *ubuf)
129 {
130 	u64 buf[32];
131 	int ret, i;
132 
133 	flush_tmregs_to_thread(target);
134 	flush_fp_to_thread(target);
135 	flush_altivec_to_thread(target);
136 	flush_vsx_to_thread(target);
137 
138 	for (i = 0; i < 32 ; i++)
139 		buf[i] = target->thread.fp_state.fpr[i][TS_VSRLOWOFFSET];
140 
141 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
142 				 buf, 0, 32 * sizeof(double));
143 	if (!ret)
144 		for (i = 0; i < 32 ; i++)
145 			target->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i];
146 
147 	return ret;
148 }
149