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 #ifdef __SPE__ 44 #define PPC_FEATURE_VECTOR PPC_FEATURE_HAS_SPE 45 #else 46 #define PPC_FEATURE_VECTOR PPC_FEATURE_HAS_ALTIVEC 47 #endif 48 49 int 50 cpu_ptrace(struct thread *td, int req, void *addr, int data) 51 { 52 int error; 53 struct pcb *pcb; 54 struct vec vec; 55 uint64_t vsr[32]; 56 uint64_t *vsr_dw1; 57 int vsr_idx; 58 59 pcb = td->td_pcb; 60 61 bzero(&vec, sizeof(vec)); 62 bzero(vsr, sizeof(vsr)); 63 64 error = EINVAL; 65 switch (req) { 66 case PT_GETVRREGS: 67 if (!(cpu_features & PPC_FEATURE_VECTOR)) 68 break; 69 70 if (pcb->pcb_flags & PCB_VEC) { 71 save_vec_nodrop(td); 72 memcpy(&vec, &pcb->pcb_vec, sizeof(vec)); 73 } 74 error = copyout(&vec, addr, sizeof(vec)); 75 break; 76 case PT_SETVRREGS: 77 if (!(cpu_features & PPC_FEATURE_VECTOR)) 78 break; 79 error = copyin(addr, &vec, sizeof(vec)); 80 if (error == 0) { 81 pcb->pcb_flags |= PCB_VEC; 82 memcpy(&pcb->pcb_vec, &vec, sizeof(vec)); 83 } 84 break; 85 case PT_GETVSRREGS: 86 if (!(cpu_features & PPC_FEATURE_HAS_VSX)) 87 break; 88 89 if (pcb->pcb_flags & PCB_VSX) { 90 save_fpu_nodrop(td); 91 92 /* 93 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and 94 * VSR32-VSR63 overlap with VR0-VR31, so we only copy 95 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31. 96 */ 97 for (vsr_idx = 0; vsr_idx < nitems(vsr); vsr_idx++) { 98 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2]; 99 vsr[vsr_idx] = *vsr_dw1; 100 } 101 } 102 error = copyout(&vsr, addr, sizeof(vsr)); 103 break; 104 case PT_SETVSRREGS: 105 if (!(cpu_features & PPC_FEATURE_HAS_VSX)) 106 break; 107 error = copyin(addr, &vsr, sizeof(vsr)); 108 if (error == 0) { 109 pcb->pcb_flags |= PCB_VSX; 110 111 /* 112 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and 113 * VSR32-VSR63 overlap with VR0-VR31, so we only copy 114 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31. 115 */ 116 for (vsr_idx = 0; vsr_idx < nitems(vsr); vsr_idx++) { 117 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2]; 118 *vsr_dw1 = vsr[vsr_idx]; 119 } 120 } 121 break; 122 123 default: 124 break; 125 } 126 127 return (error); 128 } 129