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 | |