| 1 | /* $NetBSD: process_machdep.c,v 1.29 2014/02/15 22:20:41 dsl Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Charles M. Hannum. |
| 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 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | * This file may seem a bit stylized, but that so that it's easier to port. |
| 34 | * Functions to be implemented here are: |
| 35 | * |
| 36 | * process_read_regs(proc, regs) |
| 37 | * Get the current user-visible register set from the process |
| 38 | * and copy it into the regs structure (<machine/reg.h>). |
| 39 | * The process is stopped at the time read_regs is called. |
| 40 | * |
| 41 | * process_write_regs(proc, regs) |
| 42 | * Update the current register set from the passed in regs |
| 43 | * structure. Take care to avoid clobbering special CPU |
| 44 | * registers or privileged bits in the PSL. |
| 45 | * The process is stopped at the time write_regs is called. |
| 46 | * |
| 47 | * process_sstep(proc) |
| 48 | * Arrange for the process to trap after executing a single instruction. |
| 49 | * |
| 50 | * process_set_pc(proc) |
| 51 | * Set the process's program counter. |
| 52 | */ |
| 53 | |
| 54 | |
| 55 | #include <sys/cdefs.h> |
| 56 | __KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.29 2014/02/15 22:20:41 dsl Exp $" ); |
| 57 | |
| 58 | #include <sys/param.h> |
| 59 | #include <sys/systm.h> |
| 60 | #include <sys/time.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/psl.h> |
| 67 | #include <machine/reg.h> |
| 68 | #include <machine/segments.h> |
| 69 | #include <x86/fpu.h> |
| 70 | |
| 71 | static inline struct trapframe *process_frame(struct lwp *); |
| 72 | #if 0 |
| 73 | static inline int verr_gdt(struct pmap *, int sel); |
| 74 | static inline int verr_ldt(struct pmap *, int sel); |
| 75 | #endif |
| 76 | |
| 77 | static inline struct trapframe * |
| 78 | process_frame(struct lwp *l) |
| 79 | { |
| 80 | |
| 81 | return (l->l_md.md_regs); |
| 82 | } |
| 83 | |
| 84 | int |
| 85 | process_read_regs(struct lwp *l, struct reg *regs) |
| 86 | { |
| 87 | struct trapframe *tf = process_frame(l); |
| 88 | |
| 89 | #define copy_to_reg(reg, REG, idx) regs->regs[_REG_##REG] = tf->tf_##reg; |
| 90 | _FRAME_GREG(copy_to_reg) |
| 91 | #undef copy_to_reg |
| 92 | |
| 93 | return (0); |
| 94 | } |
| 95 | |
| 96 | int |
| 97 | process_read_fpregs(struct lwp *l, struct fpreg *regs, size_t *sz) |
| 98 | { |
| 99 | |
| 100 | process_read_fpregs_xmm(l, ®s->fxstate); |
| 101 | |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | int |
| 106 | process_write_regs(struct lwp *l, const struct reg *regp) |
| 107 | { |
| 108 | struct trapframe *tf = process_frame(l); |
| 109 | int error; |
| 110 | const long *regs = regp->regs; |
| 111 | |
| 112 | /* |
| 113 | * Check for security violations. |
| 114 | * Note that struct regs is compatible with |
| 115 | * the __gregs array in mcontext_t. |
| 116 | */ |
| 117 | error = cpu_mcontext_validate(l, (const mcontext_t *)regs); |
| 118 | if (error != 0) |
| 119 | return error; |
| 120 | |
| 121 | #define copy_to_frame(reg, REG, idx) tf->tf_##reg = regs[_REG_##REG]; |
| 122 | _FRAME_GREG(copy_to_frame) |
| 123 | #undef copy_to_frame |
| 124 | |
| 125 | return (0); |
| 126 | } |
| 127 | |
| 128 | int |
| 129 | process_write_fpregs(struct lwp *l, const struct fpreg *regs, size_t sz) |
| 130 | { |
| 131 | |
| 132 | process_write_fpregs_xmm(l, ®s->fxstate); |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | int |
| 137 | process_sstep(struct lwp *l, int sstep) |
| 138 | { |
| 139 | struct trapframe *tf = process_frame(l); |
| 140 | |
| 141 | if (sstep) |
| 142 | tf->tf_rflags |= PSL_T; |
| 143 | else |
| 144 | tf->tf_rflags &= ~PSL_T; |
| 145 | |
| 146 | return (0); |
| 147 | } |
| 148 | |
| 149 | int |
| 150 | process_set_pc(struct lwp *l, void *addr) |
| 151 | { |
| 152 | struct trapframe *tf = process_frame(l); |
| 153 | |
| 154 | if ((uint64_t)addr > VM_MAXUSER_ADDRESS) |
| 155 | return EINVAL; |
| 156 | tf->tf_rip = (uint64_t)addr; |
| 157 | |
| 158 | return (0); |
| 159 | } |
| 160 | |