1/* $NetBSD: process_machdep.c,v 1.26 2011/06/07 00:48:30 matt Exp $ */ 2 3/* 4 * Copyright (c) 1994 Christopher G. Demetriou 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Christopher G. Demetriou. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33/* 34 * This file may seem a bit stylized, but that so that it's easier to port. 35 * Functions to be implemented here are: 36 * 37 * process_read_regs(proc, regs) 38 * Get the current user-visible register set from the process 39 * and copy it into the regs structure (<machine/reg.h>). 40 * The process is stopped at the time read_regs is called. 41 * 42 * process_write_regs(proc, regs) 43 * Update the current register set from the passed in regs 44 * structure. Take care to avoid clobbering special CPU 45 * registers or privileged bits in the PSL. 46 * The process is stopped at the time write_regs is called. 47 * 48 * process_sstep(proc) 49 * Arrange for the process to trap after executing a single instruction. 50 * 51 * process_set_pc(proc) 52 * Set the process's program counter. 53 */ 54 55#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 56 57__KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.26 2011/06/07 00:48:30 matt Exp $"); 58 59#include <sys/param.h> 60#include <sys/systm.h> 61#include <sys/kernel.h> 62#include <sys/proc.h> 63#include <sys/vnode.h> 64#include <sys/ptrace.h> 65 66#include <machine/cpu.h> 67#include <machine/reg.h> 68#include <machine/frame.h> 69#include <machine/alpha.h> 70 71#define lwp_frame(l) ((l)->l_md.md_tf) 72 73int 74process_read_regs(struct lwp *l, struct reg *regs) 75{ 76 struct pcb *pcb = lwp_getpcb(l); 77 78 frametoreg(lwp_frame(l), regs); 79 regs->r_regs[R_ZERO] = lwp_frame(l)->tf_regs[FRAME_PC]; 80 regs->r_regs[R_SP] = pcb->pcb_hw.apcb_usp; 81 return (0); 82} 83 84int 85process_write_regs(struct lwp *l, const struct reg *regs) 86{ 87 struct pcb *pcb = lwp_getpcb(l); 88 89 regtoframe(regs, lwp_frame(l)); 90 lwp_frame(l)->tf_regs[FRAME_PC] = regs->r_regs[R_ZERO]; 91 pcb->pcb_hw.apcb_usp = regs->r_regs[R_SP]; 92 return (0); 93} 94 95int 96process_sstep(struct lwp *l, int sstep) 97{ 98 99 if (sstep) 100 return (EINVAL); 101 102 return (0); 103} 104 105int 106process_set_pc(struct lwp *l, void *addr) 107{ 108 struct trapframe *frame = lwp_frame(l); 109 110 frame->tf_regs[FRAME_PC] = (uint64_t)addr; 111 return (0); 112} 113 114int 115process_read_fpregs(struct lwp *l, struct fpreg *regs) 116{ 117 struct pcb *pcb = lwp_getpcb(l); 118 119 fpu_save(); 120 121 memcpy(regs, &pcb->pcb_fp, sizeof(struct fpreg)); 122 return (0); 123} 124 125int 126process_write_fpregs(struct lwp *l, const struct fpreg *regs) 127{ 128 struct pcb *pcb = lwp_getpcb(l); 129 130 fpu_discard(); 131 fpu_mark_used(l); 132 133 memcpy(&pcb->pcb_fp, regs, sizeof(struct fpreg)); 134 return (0); 135} 136