ptrace-vsx.c

  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 */
 21int 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 */
 49int 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
 79int 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 */
 97int 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 */
126int 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}