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 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/malloc.h> 32 #include <sys/proc.h> 33 #include <sys/ptrace.h> 34 #include <sys/sysent.h> 35 #include <machine/altivec.h> 36 #include <machine/fpu.h> 37 #include <machine/cpu.h> 38 #include <machine/md_var.h> 39 #include <machine/pcb.h> 40 41 #ifdef __SPE__ 42 #define PPC_FEATURE_VECTOR PPC_FEATURE_HAS_SPE 43 #else 44 #define PPC_FEATURE_VECTOR PPC_FEATURE_HAS_ALTIVEC 45 #endif 46 47 int 48 cpu_ptrace(struct thread *td, int req, void *addr, int data) 49 { 50 int error; 51 struct pcb *pcb; 52 struct vec vec; 53 uint64_t vsr[32]; 54 uint64_t *vsr_dw1; 55 int vsr_idx; 56 57 pcb = td->td_pcb; 58 59 bzero(&vec, sizeof(vec)); 60 bzero(vsr, sizeof(vsr)); 61 62 error = EINVAL; 63 switch (req) { 64 case PT_GETVRREGS: 65 if (!(cpu_features & PPC_FEATURE_VECTOR)) 66 break; 67 68 if (pcb->pcb_flags & PCB_VEC) { 69 save_vec_nodrop(td); 70 memcpy(&vec, &pcb->pcb_vec, sizeof(vec)); 71 } 72 error = copyout(&vec, addr, sizeof(vec)); 73 break; 74 case PT_SETVRREGS: 75 if (!(cpu_features & PPC_FEATURE_VECTOR)) 76 break; 77 error = copyin(addr, &vec, sizeof(vec)); 78 if (error == 0) { 79 pcb->pcb_flags |= PCB_VEC; 80 memcpy(&pcb->pcb_vec, &vec, sizeof(vec)); 81 } 82 break; 83 case PT_GETVSRREGS: 84 if (!(cpu_features & PPC_FEATURE_HAS_VSX)) 85 break; 86 87 if (pcb->pcb_flags & PCB_VSX) { 88 save_fpu_nodrop(td); 89 90 /* 91 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and 92 * VSR32-VSR63 overlap with VR0-VR31, so we only copy 93 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31. 94 */ 95 for (vsr_idx = 0; vsr_idx < nitems(vsr); vsr_idx++) { 96 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2]; 97 vsr[vsr_idx] = *vsr_dw1; 98 } 99 } 100 error = copyout(&vsr, addr, sizeof(vsr)); 101 break; 102 case PT_SETVSRREGS: 103 if (!(cpu_features & PPC_FEATURE_HAS_VSX)) 104 break; 105 error = copyin(addr, &vsr, sizeof(vsr)); 106 if (error == 0) { 107 pcb->pcb_flags |= PCB_VSX; 108 109 /* 110 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and 111 * VSR32-VSR63 overlap with VR0-VR31, so we only copy 112 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31. 113 */ 114 for (vsr_idx = 0; vsr_idx < nitems(vsr); vsr_idx++) { 115 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2]; 116 *vsr_dw1 = vsr[vsr_idx]; 117 } 118 } 119 break; 120 121 default: 122 break; 123 } 124 125 return (error); 126 } 127