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/param.h> 29 #include <sys/systm.h> 30 #include <sys/malloc.h> 31 #include <sys/proc.h> 32 #include <sys/ptrace.h> 33 #include <sys/sysent.h> 34 #include <machine/altivec.h> 35 #include <machine/fpu.h> 36 #include <machine/cpu.h> 37 #include <machine/md_var.h> 38 #include <machine/pcb.h> 39 40 #ifdef __SPE__ 41 #define PPC_FEATURE_VECTOR PPC_FEATURE_HAS_SPE 42 #else 43 #define PPC_FEATURE_VECTOR PPC_FEATURE_HAS_ALTIVEC 44 #endif 45 46 int 47 cpu_ptrace(struct thread *td, int req, void *addr, int data) 48 { 49 int error; 50 struct pcb *pcb; 51 struct vec vec; 52 uint64_t vsr[32]; 53 uint64_t *vsr_dw1; 54 int vsr_idx; 55 56 pcb = td->td_pcb; 57 58 bzero(&vec, sizeof(vec)); 59 bzero(vsr, sizeof(vsr)); 60 61 error = EINVAL; 62 switch (req) { 63 case PT_GETVRREGS: 64 if (!(cpu_features & PPC_FEATURE_VECTOR)) 65 break; 66 67 if (pcb->pcb_flags & PCB_VEC) { 68 save_vec_nodrop(td); 69 memcpy(&vec, &pcb->pcb_vec, sizeof(vec)); 70 } 71 error = copyout(&vec, addr, sizeof(vec)); 72 break; 73 case PT_SETVRREGS: 74 if (!(cpu_features & PPC_FEATURE_VECTOR)) 75 break; 76 error = copyin(addr, &vec, sizeof(vec)); 77 if (error == 0) { 78 pcb->pcb_flags |= PCB_VEC; 79 memcpy(&pcb->pcb_vec, &vec, sizeof(vec)); 80 } 81 break; 82 case PT_GETVSRREGS: 83 if (!(cpu_features & PPC_FEATURE_HAS_VSX)) 84 break; 85 86 if (pcb->pcb_flags & PCB_VSX) { 87 save_fpu_nodrop(td); 88 89 /* 90 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and 91 * VSR32-VSR63 overlap with VR0-VR31, so we only copy 92 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31. 93 */ 94 for (vsr_idx = 0; vsr_idx < nitems(vsr); vsr_idx++) { 95 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2]; 96 vsr[vsr_idx] = *vsr_dw1; 97 } 98 } 99 error = copyout(&vsr, addr, sizeof(vsr)); 100 break; 101 case PT_SETVSRREGS: 102 if (!(cpu_features & PPC_FEATURE_HAS_VSX)) 103 break; 104 error = copyin(addr, &vsr, sizeof(vsr)); 105 if (error == 0) { 106 pcb->pcb_flags |= PCB_VSX; 107 108 /* 109 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and 110 * VSR32-VSR63 overlap with VR0-VR31, so we only copy 111 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31. 112 */ 113 for (vsr_idx = 0; vsr_idx < nitems(vsr); vsr_idx++) { 114 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2]; 115 *vsr_dw1 = vsr[vsr_idx]; 116 } 117 } 118 break; 119 120 default: 121 break; 122 } 123 124 return (error); 125 } 126