1 /*-
2 * Copyright (c) 2014 Justin Hibbits
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/malloc.h>
34 #include <sys/proc.h>
35 #include <sys/ptrace.h>
36 #include <sys/sysent.h>
37 #include <machine/altivec.h>
38 #include <machine/fpu.h>
39 #include <machine/cpu.h>
40 #include <machine/md_var.h>
41 #include <machine/pcb.h>
42
43 int
44 cpu_ptrace(struct thread *td, int req, void *addr, int data)
45 {
46 int error;
47 struct pcb *pcb;
48 struct vec vec;
49 uint64_t vsr[32];
50 uint64_t *vsr_dw1;
51 int vsr_idx;
52
53 pcb = td->td_pcb;
54
55 bzero(&vec, sizeof(vec));
56 bzero(vsr, sizeof(vsr));
57
58 error = EINVAL;
59 switch (req) {
60 case PT_GETVRREGS:
61 if (!(cpu_features & PPC_FEATURE_HAS_ALTIVEC))
62 break;
63
64 if (pcb->pcb_flags & PCB_VEC) {
65 save_vec_nodrop(td);
66 memcpy(&vec, &pcb->pcb_vec, sizeof(vec));
67 }
68 error = copyout(&vec, addr, sizeof(vec));
69 break;
70 case PT_SETVRREGS:
71 if (!(cpu_features & PPC_FEATURE_HAS_ALTIVEC))
72 break;
73 error = copyin(addr, &vec, sizeof(vec));
74 if (error == 0) {
75 pcb->pcb_flags |= PCB_VEC;
76 memcpy(&pcb->pcb_vec, &vec, sizeof(vec));
77 }
78 break;
79 case PT_GETVSRREGS:
80 if (!(cpu_features & PPC_FEATURE_HAS_VSX))
81 break;
82
83 if (pcb->pcb_flags & PCB_VSX) {
84 save_fpu_nodrop(td);
85
86 /*
87 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and
88 * VSR32-VSR63 overlap with VR0-VR31, so we only copy
89 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31.
90 */
91 for (vsr_idx = 0; vsr_idx < nitems(vsr); vsr_idx++) {
92 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2];
93 vsr[vsr_idx] = *vsr_dw1;
94 }
95 }
96 error = copyout(&vsr, addr, sizeof(vsr));
97 break;
98 case PT_SETVSRREGS:
99 if (!(cpu_features & PPC_FEATURE_HAS_VSX))
100 break;
101 error = copyin(addr, &vsr, sizeof(vsr));
102 if (error == 0) {
103 pcb->pcb_flags |= PCB_VSX;
104
105 /*
106 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and
107 * VSR32-VSR63 overlap with VR0-VR31, so we only copy
108 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31.
109 */
110 for (vsr_idx = 0; vsr_idx < nitems(vsr); vsr_idx++) {
111 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2];
112 *vsr_dw1 = vsr[vsr_idx];
113 }
114 }
115 break;
116
117 default:
118 break;
119 }
120
121 return (error);
122 }
Cache object: f558fd768a453f90fc57d7db6dfdd06b
|