/* $NetBSD: process_machdep.c,v 1.16 2008/04/28 20:23:12 martin Exp $ */ /*- * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Charles M. Hannum. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * This file may seem a bit stylized, but that so that it's easier to port. * Functions to be implemented here are: * * process_read_regs(proc, regs) * Get the current user-visible register set from the process * and copy it into the regs structure (<machine/reg.h>). * The process is stopped at the time read_regs is called. * * process_write_regs(proc, regs) * Update the current register set from the passed in regs * structure. Take care to avoid clobbering special CPU * registers or privileged bits in the PSL. * The process is stopped at the time write_regs is called. * * process_sstep(proc) * Arrange for the process to trap after executing a single instruction. * * process_set_pc(proc) * Set the process's program counter. */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.16 2008/04/28 20:23:12 martin Exp $"); #include <sys/param.h> #include <sys/systm.h> #include <sys/time.h> #include <sys/kernel.h> #include <sys/proc.h> #include <sys/user.h> #include <sys/vnode.h> #include <sys/ptrace.h> #include <uvm/uvm_extern.h> #include <machine/psl.h> #include <machine/reg.h> #include <machine/segments.h> #include <machine/fpu.h> static inline struct trapframe *process_frame(struct lwp *); static inline struct fxsave64 *process_fpframe(struct lwp *); #if 0 static inline int verr_gdt(struct pmap *, int sel); static inline int verr_ldt(struct pmap *, int sel); #endif static inline struct trapframe * process_frame(struct lwp *l) { return (l->l_md.md_regs); } static inline struct fxsave64 * process_fpframe(struct lwp *l) { return (&l->l_addr->u_pcb.pcb_savefpu.fp_fxsave); } int process_read_regs(struct lwp *l, struct reg *regs) { struct trapframe *tf = process_frame(l); #define copy_to_reg(reg, REG, idx) regs->regs[_REG_##REG] = tf->tf_##reg; _FRAME_GREG(copy_to_reg) #undef copy_to_reg return (0); } int process_read_fpregs(struct lwp *l, struct fpreg *regs) { struct fxsave64 *frame = process_fpframe(l); if (l->l_md.md_flags & MDP_USEDFPU) { fpusave_lwp(l, true); } else { uint16_t cw; uint32_t mxcsr, mxcsr_mask; /* * Fake a FNINIT. * The initial control word was already set by setregs(), so * save it temporarily. */ cw = frame->fx_fcw; mxcsr = frame->fx_mxcsr; mxcsr_mask = frame->fx_mxcsr_mask; memset(frame, 0, sizeof(*regs)); frame->fx_fcw = cw; frame->fx_fsw = 0x0000; frame->fx_ftw = 0xff; frame->fx_mxcsr = mxcsr; frame->fx_mxcsr_mask = mxcsr_mask; l->l_md.md_flags |= MDP_USEDFPU; } memcpy(®s->fxstate, frame, sizeof(*regs)); return (0); } int process_write_regs(struct lwp *l, const struct reg *regp) { struct trapframe *tf = process_frame(l); int error; const long *regs = regp->regs; /* * Check for security violations. * Note that struct regs is compatible with * the __gregs array in mcontext_t. */ error = check_mcontext(l, (const mcontext_t *)regs, tf); if (error != 0) return error; #define copy_to_frame(reg, REG, idx) tf->tf_##reg = regs[_REG_##REG]; _FRAME_GREG(copy_to_frame) #undef copy_to_frame return (0); } int process_write_fpregs(struct lwp *l, const struct fpreg *regs) { struct fxsave64 *frame = process_fpframe(l); if (l->l_md.md_flags & MDP_USEDFPU) { fpusave_lwp(l, false); } else { l->l_md.md_flags |= MDP_USEDFPU; } memcpy(frame, ®s->fxstate, sizeof(*regs)); return (0); } int process_sstep(struct lwp *l, int sstep) { struct trapframe *tf = process_frame(l); if (sstep) tf->tf_rflags |= PSL_T; else tf->tf_rflags &= ~PSL_T; return (0); } int process_set_pc(struct lwp *l, void *addr) { struct trapframe *tf = process_frame(l); if ((uint64_t)addr > VM_MAXUSER_ADDRESS) return EINVAL; tf->tf_rip = (uint64_t)addr; return (0); }