1 /* $NetBSD: process_machdep.c,v 1.11 2003/08/07 16:26:52 agc 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 * Copyright (c) 1995 Charles M. Hannum. All rights reserved. 42 * Copyright (c) 1993 Jan-Simon Pendry 43 * All rights reserved. 44 * 45 * This code is derived from software contributed to Berkeley by 46 * Jan-Simon Pendry. 47 * 48 * Redistribution and use in source and binary forms, with or without 49 * modification, are permitted provided that the following conditions 50 * are met: 51 * 1. Redistributions of source code must retain the above copyright 52 * notice, this list of conditions and the following disclaimer. 53 * 2. Redistributions in binary form must reproduce the above copyright 54 * notice, this list of conditions and the following disclaimer in the 55 * documentation and/or other materials provided with the distribution. 56 * 3. All advertising materials mentioning features or use of this software 57 * must display the following acknowledgement: 58 * This product includes software developed by the University of 59 * California, Berkeley and its contributors. 60 * 4. Neither the name of the University nor the names of its contributors 61 * may be used to endorse or promote products derived from this software 62 * without specific prior written permission. 63 * 64 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 65 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 66 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 67 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 68 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 69 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 70 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 71 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 72 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 73 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 74 * SUCH DAMAGE. 75 * 76 * From: 77 * Id: procfs_i386.c,v 4.1 1993/12/17 10:47:45 jsp Rel 78 */ 79 80 /* 81 * This file may seem a bit stylized, but that so that it's easier to port. 82 * Functions to be implemented here are: 83 * 84 * process_read_regs(proc, regs) 85 * Get the current user-visible register set from the process 86 * and copy it into the regs structure (<machine/reg.h>). 87 * The process is stopped at the time read_regs is called. 88 * 89 * process_write_regs(proc, regs) 90 * Update the current register set from the passed in regs 91 * structure. Take care to avoid clobbering special CPU 92 * registers or privileged bits in the PSL. 93 * The process is stopped at the time write_regs is called. 94 * 95 * process_sstep(proc, sstep) 96 * Arrange for the process to trap or not trap depending on sstep 97 * after executing a single instruction. 98 * 99 * process_set_pc(proc) 100 * Set the process's program counter. 101 */ 102 103 #include "opt_armfpe.h" 104 105 #include <sys/param.h> 106 107 __KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.11 2003/08/07 16:26:52 agc Exp $"); 108 109 #include <sys/proc.h> 110 #include <sys/ptrace.h> 111 #include <sys/systm.h> 112 #include <sys/user.h> 113 114 #include <machine/frame.h> 115 #include <machine/pcb.h> 116 #include <machine/reg.h> 117 118 #include <arm/armreg.h> 119 120 #ifdef ARMFPE 121 #include <arm/fpe-arm/armfpe.h> 122 #endif 123 124 static __inline struct trapframe * 125 process_frame(struct lwp *l) 126 { 127 128 return l->l_addr->u_pcb.pcb_tf; 129 } 130 131 int 132 process_read_regs(struct lwp *l, struct reg *regs) 133 { 134 struct trapframe *tf = process_frame(l); 135 136 KASSERT(tf != NULL); 137 bcopy((caddr_t)&tf->tf_r0, (caddr_t)regs->r, sizeof(regs->r)); 138 regs->r_sp = tf->tf_usr_sp; 139 regs->r_lr = tf->tf_usr_lr; 140 regs->r_pc = tf->tf_pc; 141 regs->r_cpsr = tf->tf_spsr; 142 143 #ifdef DIAGNOSTIC 144 if ((tf->tf_spsr & PSR_MODE) == PSR_USR32_MODE 145 && tf->tf_spsr & I32_bit) 146 panic("process_read_regs: Interrupts blocked in user process"); 147 #endif 148 149 return(0); 150 } 151 152 int 153 process_read_fpregs(struct lwp *l, struct fpreg *regs) 154 { 155 #ifdef ARMFPE 156 arm_fpe_getcontext(p, regs); 157 return(0); 158 #else /* ARMFPE */ 159 /* No hardware FP support */ 160 memset(regs, 0, sizeof(struct fpreg)); 161 return(0); 162 #endif /* ARMFPE */ 163 } 164 165 int 166 process_write_regs(struct lwp *l, struct reg *regs) 167 { 168 struct trapframe *tf = process_frame(l); 169 170 KASSERT(tf != NULL); 171 bcopy((caddr_t)regs->r, (caddr_t)&tf->tf_r0, sizeof(regs->r)); 172 tf->tf_usr_sp = regs->r_sp; 173 tf->tf_usr_lr = regs->r_lr; 174 #ifdef __PROG32 175 tf->tf_pc = regs->r_pc; 176 tf->tf_spsr &= ~PSR_FLAGS; 177 tf->tf_spsr |= regs->r_cpsr & PSR_FLAGS; 178 #ifdef DIAGNOSTIC 179 if ((tf->tf_spsr & PSR_MODE) == PSR_USR32_MODE 180 && tf->tf_spsr & I32_bit) 181 panic("process_write_regs: Interrupts blocked in user process"); 182 #endif 183 #else /* __PROG26 */ 184 if ((regs->r_pc & (R15_MODE | R15_IRQ_DISABLE | R15_FIQ_DISABLE)) != 0) 185 return EPERM; 186 187 tf->tf_r15 = regs->r_pc; 188 #endif 189 190 return(0); 191 } 192 193 int 194 process_write_fpregs(struct lwp *l, struct fpreg *regs) 195 { 196 #ifdef ARMFPE 197 arm_fpe_setcontext(p, regs); 198 return(0); 199 #else /* ARMFPE */ 200 /* No hardware FP support */ 201 return(0); 202 #endif /* ARMFPE */ 203 } 204 205 int 206 process_set_pc(struct lwp *l, caddr_t addr) 207 { 208 struct trapframe *tf = process_frame(l); 209 210 KASSERT(tf != NULL); 211 #ifdef __PROG32 212 tf->tf_pc = (int)addr; 213 #else /* __PROG26 */ 214 /* Only set the PC, not the PSR */ 215 if (((register_t)addr & R15_PC) != (register_t)addr) 216 return EINVAL; 217 tf->tf_r15 = (tf->tf_r15 & ~R15_PC) | (register_t)addr; 218 #endif 219 220 return (0); 221 } 222