1 /* $NetBSD: process_machdep.c,v 1.32 2011/01/14 02:06:28 rmind 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) 1994 Adam Glass 40 * Copyright (c) 1993 Jan-Simon Pendry 41 * All rights reserved. 42 * 43 * This code is derived from software contributed to Berkeley by 44 * Jan-Simon Pendry. 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 1. Redistributions of source code must retain the above copyright 50 * notice, this list of conditions and the following disclaimer. 51 * 2. Redistributions in binary form must reproduce the above copyright 52 * notice, this list of conditions and the following disclaimer in the 53 * documentation and/or other materials provided with the distribution. 54 * 3. All advertising materials mentioning features or use of this software 55 * must display the following acknowledgement: 56 * This product includes software developed by the University of 57 * California, Berkeley and its contributors. 58 * 4. Neither the name of the University nor the names of its contributors 59 * may be used to endorse or promote products derived from this software 60 * without specific prior written permission. 61 * 62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 72 * SUCH DAMAGE. 73 * 74 * From: 75 * Id: procfs_i386.c,v 4.1 1993/12/17 10:47:45 jsp Rel 76 */ 77 78 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 79 __KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.32 2011/01/14 02:06:28 rmind Exp $"); 80 81 /* 82 * This file may seem a bit stylized, but that so that it's easier to port. 83 * Functions to be implemented here are: 84 * 85 * process_read_regs(proc, regs) 86 * Get the current user-visible register set from the process 87 * and copy it into the regs structure (<machine/reg.h>). 88 * The process is stopped at the time read_regs is called. 89 * 90 * process_write_regs(proc, regs) 91 * Update the current register set from the passed in regs 92 * structure. Take care to avoid clobbering special CPU 93 * registers or privileged bits in the PSL. 94 * The process is stopped at the time write_regs is called. 95 * 96 * process_sstep(proc) 97 * Arrange for the process to trap after executing a single instruction. 98 * 99 * process_set_pc(proc) 100 * Set the process's program counter. 101 */ 102 103 #include <sys/param.h> 104 #include <sys/systm.h> 105 #include <sys/proc.h> 106 #include <sys/ptrace.h> 107 108 #include <mips/pcb.h> 109 #include <mips/regnum.h> /* symbolic register indices */ 110 111 CTASSERT(sizeof(struct reg) == sizeof(((struct frame *)0)->f_regs)); 112 113 int 114 process_read_regs(struct lwp *l, struct reg *regs) 115 { 116 117 memcpy(regs, l->l_md.md_regs->f_regs, sizeof(struct reg)); 118 return 0; 119 } 120 121 int 122 process_write_regs(struct lwp *l, const struct reg *regs) 123 { 124 struct frame *f = l->l_md.md_regs; 125 mips_reg_t sr; 126 127 sr = f->f_regs[_R_SR]; 128 memcpy(l->l_md.md_regs, regs, sizeof(struct reg)); 129 f->f_regs[_R_SR] = sr; 130 return 0; 131 } 132 133 #if defined(__mips_n32) || defined(__mips_n64) 134 CTASSERT(sizeof(struct fpreg_oabi) <= sizeof(struct fpreg)); 135 #endif 136 137 int 138 process_read_xfpregs(struct lwp *l, struct fpreg *regs, size_t *regslen_p) 139 { 140 struct pcb * const pcb = lwp_getpcb(l); 141 KASSERT(*regslen_p == sizeof(struct fpreg)); 142 143 #if defined(__mips_n32) || defined(__mips_n64) 144 if (!_MIPS_SIM_NEWABI_P(l->l_proc->p_md.md_abi)) 145 *regslen_p = sizeof(struct fpreg_oabi); 146 #endif 147 148 if ((l->l_md.md_flags & MDP_FPUSED) && l == fpcurlwp) 149 savefpregs(l); 150 memcpy(regs, &pcb->pcb_fpregs, sizeof(struct fpreg)); 151 return 0; 152 } 153 154 int 155 process_write_xfpregs(struct lwp *l, const struct fpreg *regs, size_t regslen) 156 { 157 struct pcb * const pcb = lwp_getpcb(l); 158 159 /* to load FPA contents next time when FP insn is executed */ 160 if ((l->l_md.md_flags & MDP_FPUSED) && l == fpcurlwp) 161 fpcurlwp = &lwp0; 162 #if defined(__mips_n32) || defined(__mips_n64) 163 KASSERT((_MIPS_SIM_NEWABI_P(l->l_proc->p_md.md_abi) ? sizeof(struct fpreg) : sizeof(struct fpreg_oabi)) == regslen); 164 #else 165 KASSERT(regslen == sizeof(struct fpreg)); 166 #endif 167 memcpy(&pcb->pcb_fpregs, regs, regslen); 168 return 0; 169 } 170 171 int 172 process_sstep(struct lwp *l, int sstep) 173 { 174 175 /* XXX what are the correct semantics: sstep once, or forevermore? */ 176 if (sstep) 177 mips_singlestep(l); 178 return 0; 179 } 180 181 int 182 process_set_pc(struct lwp *l, void *addr) 183 { 184 185 ((struct frame *)l->l_md.md_regs)->f_regs[_R_PC] = (intptr_t)addr; 186 return 0; 187 } 188