1 /* $NetBSD: process_machdep.c,v 1.18 2001/07/12 23:35:43 thorpej 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 1.18 2001/07/12 23:35:43 thorpej 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/user.h> 64 #include <sys/vnode.h> 65 #include <sys/ptrace.h> 66 67 #include <machine/cpu.h> 68 #include <machine/reg.h> 69 #include <machine/frame.h> 70 #include <machine/alpha.h> 71 72 #define process_frame(p) ((p)->p_md.md_tf) 73 #define process_pcb(p) (&(p)->p_addr->u_pcb) 74 #define process_fpframe(p) (&(process_pcb(p)->pcb_fp)) 75 76 int 77 process_read_regs(struct proc *p, struct reg *regs) 78 { 79 80 frametoreg(process_frame(p), regs); 81 regs->r_regs[R_ZERO] = process_frame(p)->tf_regs[FRAME_PC]; 82 regs->r_regs[R_SP] = process_pcb(p)->pcb_hw.apcb_usp; 83 return (0); 84 } 85 86 int 87 process_write_regs(struct proc *p, struct reg *regs) 88 { 89 90 regtoframe(regs, process_frame(p)); 91 process_frame(p)->tf_regs[FRAME_PC] = regs->r_regs[R_ZERO]; 92 process_pcb(p)->pcb_hw.apcb_usp = regs->r_regs[R_SP]; 93 return (0); 94 } 95 96 int 97 process_sstep(struct proc *p, int sstep) 98 { 99 100 if (sstep) 101 return (EINVAL); 102 103 return (0); 104 } 105 106 int 107 process_set_pc(struct proc *p, caddr_t addr) 108 { 109 struct trapframe *frame = process_frame(p); 110 111 frame->tf_regs[FRAME_PC] = (u_int64_t)addr; 112 return (0); 113 } 114 115 int 116 process_read_fpregs(struct proc *p, struct fpreg *regs) 117 { 118 119 if (p->p_addr->u_pcb.pcb_fpcpu != NULL) 120 fpusave_proc(p, 1); 121 122 memcpy(regs, process_fpframe(p), sizeof(struct fpreg)); 123 return (0); 124 } 125 126 int 127 process_write_fpregs(struct proc *p, struct fpreg *regs) 128 { 129 130 if (p->p_addr->u_pcb.pcb_fpcpu != NULL) 131 fpusave_proc(p, 0); 132 133 memcpy(process_fpframe(p), regs, sizeof(struct fpreg)); 134 return (0); 135 } 136