1 /* $NetBSD: process_machdep.c,v 1.35 2021/02/01 19:31:34 skrll Exp $ */ 2 3 /* 4 * Copyright (c) 1993 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * From: 35 * Id: procfs_i386.c,v 4.1 1993/12/17 10:47:45 jsp Rel 36 */ 37 38 /* 39 * Copyright (c) 1995 Frank Lancaster. All rights reserved. 40 * Copyright (c) 1995 Tools GmbH. All rights reserved. 41 * All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by TooLs GmbH. 54 * 4. The name of TooLs GmbH may not be used to endorse or promote products 55 * derived from this software without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 58 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 59 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 60 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 61 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 62 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 63 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 64 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 65 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 66 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 67 */ 68 69 /* 70 * Copyright (c) 1995 Charles M. Hannum. All rights reserved. 71 * Copyright (c) 1993 Jan-Simon Pendry 72 * All rights reserved. 73 * 74 * This code is derived from software contributed to Berkeley by 75 * Jan-Simon Pendry. 76 * 77 * Redistribution and use in source and binary forms, with or without 78 * modification, are permitted provided that the following conditions 79 * are met: 80 * 1. Redistributions of source code must retain the above copyright 81 * notice, this list of conditions and the following disclaimer. 82 * 2. Redistributions in binary form must reproduce the above copyright 83 * notice, this list of conditions and the following disclaimer in the 84 * documentation and/or other materials provided with the distribution. 85 * 3. All advertising materials mentioning features or use of this software 86 * must display the following acknowledgement: 87 * This product includes software developed by the University of 88 * California, Berkeley and its contributors. 89 * 4. Neither the name of the University nor the names of its contributors 90 * may be used to endorse or promote products derived from this software 91 * without specific prior written permission. 92 * 93 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 94 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 95 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 96 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 97 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 98 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 99 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 101 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 102 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 103 * SUCH DAMAGE. 104 * 105 * From: 106 * Id: procfs_i386.c,v 4.1 1993/12/17 10:47:45 jsp Rel 107 */ 108 109 /* 110 * This file may seem a bit stylized, but that so that it's easier to port. 111 * Functions to be implemented here are: 112 * 113 * process_read_regs(proc, regs) 114 * Get the current user-visible register set from the process 115 * and copy it into the regs structure (<machine/reg.h>). 116 * The process is stopped at the time read_regs is called. 117 * 118 * process_write_regs(proc, regs) 119 * Update the current register set from the passed in regs 120 * structure. Take care to avoid clobbering special CPU 121 * registers or privileged bits in the PSL. 122 * The process is stopped at the time write_regs is called. 123 * 124 * process_sstep(proc, sstep) 125 * Arrange for the process to trap or not trap depending on sstep 126 * after executing a single instruction. 127 * 128 * process_set_pc(proc) 129 * Set the process's program counter. 130 */ 131 132 #ifdef _KERNEL_OPT 133 #include "opt_armfpe.h" 134 #endif 135 136 #include <sys/param.h> 137 138 __KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.35 2021/02/01 19:31:34 skrll Exp $"); 139 140 #include <sys/proc.h> 141 #include <sys/ptrace.h> 142 #include <sys/systm.h> 143 144 #include <arm/armreg.h> 145 #include <arm/vfpreg.h> 146 #include <arm/locore.h> 147 148 #include <machine/pcb.h> 149 #include <machine/reg.h> 150 151 int 152 process_read_regs(struct lwp *l, struct reg *regs) 153 { 154 struct trapframe * const tf = lwp_trapframe(l); 155 156 KASSERT(tf != NULL); 157 memcpy((void *)regs->r, (void *)&tf->tf_r0, sizeof(regs->r)); 158 regs->r_sp = tf->tf_usr_sp; 159 regs->r_lr = tf->tf_usr_lr; 160 regs->r_pc = tf->tf_pc; 161 regs->r_cpsr = tf->tf_spsr; 162 163 KASSERT(VALID_PSR(tf->tf_spsr)); 164 165 #ifdef THUMB_CODE 166 if (tf->tf_spsr & PSR_T_bit) 167 regs->r_pc |= 1; 168 #endif 169 170 return 0; 171 } 172 173 int 174 process_read_fpregs(struct lwp *l, struct fpreg *regs, size_t *sz) 175 { 176 #ifdef FPU_VFP 177 if (curcpu()->ci_vfp_id == 0) { 178 memset(regs, 0, sizeof(*regs)); 179 return 0; 180 } 181 const struct pcb * const pcb = lwp_getpcb(l); 182 vfp_savecontext(l); 183 regs->fpr_vfp = pcb->pcb_vfp; 184 regs->fpr_vfp.vfp_fpexc &= ~VFP_FPEXC_EN; 185 #endif 186 return 0; 187 } 188 189 int 190 process_write_regs(struct lwp *l, const struct reg *regs) 191 { 192 struct trapframe * const tf = lwp_trapframe(l); 193 194 KASSERT(tf != NULL); 195 memcpy(&tf->tf_r0, regs->r, sizeof(regs->r)); 196 tf->tf_usr_sp = regs->r_sp; 197 tf->tf_usr_lr = regs->r_lr; 198 tf->tf_pc = regs->r_pc; 199 tf->tf_spsr &= ~(PSR_FLAGS | PSR_T_bit); 200 tf->tf_spsr |= regs->r_cpsr & PSR_FLAGS; 201 #ifdef THUMB_CODE 202 if ((regs->r_pc & 1) || (regs->r_cpsr & PSR_T_bit)) 203 tf->tf_spsr |= PSR_T_bit; 204 #endif 205 KASSERT(VALID_PSR(tf->tf_spsr)); 206 207 return 0; 208 } 209 210 int 211 process_write_fpregs(struct lwp *l, const struct fpreg *regs, size_t sz) 212 { 213 #ifdef FPU_VFP 214 if (curcpu()->ci_vfp_id == 0) { 215 return EINVAL; 216 } 217 struct pcb * const pcb = lwp_getpcb(l); 218 vfp_discardcontext(l, true); 219 pcb->pcb_vfp = regs->fpr_vfp; 220 pcb->pcb_vfp.vfp_fpexc &= ~VFP_FPEXC_EN; 221 #endif 222 return 0; 223 } 224 225 int 226 process_set_pc(struct lwp *l, void *addr) 227 { 228 struct trapframe * const tf = lwp_trapframe(l); 229 230 KASSERT(tf != NULL); 231 tf->tf_pc = (int)addr; 232 #ifdef THUMB_CODE 233 if (((int)addr) & 1) 234 tf->tf_spsr |= PSR_T_bit; 235 else 236 tf->tf_spsr &= ~PSR_T_bit; 237 #endif 238 239 return 0; 240 } 241
Indexes created Sun Oct 25 00:26:45 UTC 2026