135 lines
4.0 KiB
C
135 lines
4.0 KiB
C
/* $NetBSD: process_machdep.c,v 1.29 2014/05/16 19:18:21 matt Exp $ */
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/*
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* Copyright (c) 1994 Christopher G. Demetriou
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christopher G. Demetriou.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This file may seem a bit stylized, but that so that it's easier to port.
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* Functions to be implemented here are:
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*
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* process_read_regs(proc, regs)
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* Get the current user-visible register set from the process
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* and copy it into the regs structure (<machine/reg.h>).
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* The process is stopped at the time read_regs is called.
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*
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* process_write_regs(proc, regs)
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* Update the current register set from the passed in regs
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* structure. Take care to avoid clobbering special CPU
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* registers or privileged bits in the PSL.
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* The process is stopped at the time write_regs is called.
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*
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* process_sstep(proc)
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* Arrange for the process to trap after executing a single instruction.
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*
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* process_set_pc(proc)
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* Set the process's program counter.
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*/
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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__KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.29 2014/05/16 19:18:21 matt Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/ptrace.h>
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#include <machine/cpu.h>
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#include <machine/reg.h>
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#include <machine/frame.h>
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#include <machine/alpha.h>
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#define lwp_frame(l) ((l)->l_md.md_tf)
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int
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process_read_regs(struct lwp *l, struct reg *regs)
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{
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struct pcb *pcb = lwp_getpcb(l);
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frametoreg(lwp_frame(l), regs);
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regs->r_regs[R_ZERO] = lwp_frame(l)->tf_regs[FRAME_PC];
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regs->r_regs[R_SP] = pcb->pcb_hw.apcb_usp;
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return (0);
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}
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int
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process_write_regs(struct lwp *l, const struct reg *regs)
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{
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struct pcb *pcb = lwp_getpcb(l);
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regtoframe(regs, lwp_frame(l));
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lwp_frame(l)->tf_regs[FRAME_PC] = regs->r_regs[R_ZERO];
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pcb->pcb_hw.apcb_usp = regs->r_regs[R_SP];
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return (0);
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}
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int
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process_sstep(struct lwp *l, int sstep)
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{
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if (sstep)
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return (EINVAL);
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return (0);
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}
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int
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process_set_pc(struct lwp *l, void *addr)
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{
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struct trapframe *frame = lwp_frame(l);
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frame->tf_regs[FRAME_PC] = (uint64_t)addr;
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return (0);
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}
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int
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process_read_fpregs(struct lwp *l, struct fpreg *regs, size_t *sz)
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{
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struct pcb *pcb = lwp_getpcb(l);
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fpu_save();
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memcpy(regs, &pcb->pcb_fp, sizeof(struct fpreg));
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return (0);
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}
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int
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process_write_fpregs(struct lwp *l, const struct fpreg *regs, size_t sz)
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{
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struct pcb *pcb = lwp_getpcb(l);
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fpu_discard(true);
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memcpy(&pcb->pcb_fp, regs, sizeof(struct fpreg));
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return (0);
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}
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