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 } 123