| 1 | /* $NetBSD: netbsd32_ptrace.c,v 1.2 2016/11/02 00:11:59 pgoyette Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2016 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Nick Hudson |
| 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 | #include <sys/cdefs.h> |
| 33 | __KERNEL_RCSID(0, "$NetBSD: netbsd32_ptrace.c,v 1.2 2016/11/02 00:11:59 pgoyette Exp $" ); |
| 34 | |
| 35 | #if defined(_KERNEL_OPT) |
| 36 | #include "opt_ptrace.h" |
| 37 | #include "opt_compat_netbsd.h" |
| 38 | #endif |
| 39 | |
| 40 | #include <sys/param.h> |
| 41 | #include <sys/module.h> |
| 42 | #include <sys/ptrace.h> |
| 43 | #include <sys/syscallvar.h> |
| 44 | |
| 45 | #include <compat/netbsd32/netbsd32.h> |
| 46 | #include <compat/netbsd32/netbsd32_syscall.h> |
| 47 | #include <compat/netbsd32/netbsd32_syscallargs.h> |
| 48 | #include <compat/netbsd32/netbsd32_conv.h> |
| 49 | |
| 50 | extern struct emul emul_netbsd32; |
| 51 | |
| 52 | |
| 53 | /* |
| 54 | * PTRACE methods |
| 55 | */ |
| 56 | |
| 57 | static int netbsd32_copyinpiod(struct ptrace_io_desc *, const void *); |
| 58 | static void netbsd32_copyoutpiod(const struct ptrace_io_desc *, void *); |
| 59 | static int netbsd32_doregs(struct lwp *, struct lwp *, struct uio *); |
| 60 | static int netbsd32_dofpregs(struct lwp *, struct lwp *, struct uio *); |
| 61 | |
| 62 | |
| 63 | static int |
| 64 | netbsd32_copyinpiod(struct ptrace_io_desc *piod, const void *addr) |
| 65 | { |
| 66 | struct netbsd32_ptrace_io_desc piod32; |
| 67 | |
| 68 | int error = copyin(addr, &piod32, sizeof(piod32)); |
| 69 | if (error) |
| 70 | return error; |
| 71 | piod->piod_op = piod32.piod_op; |
| 72 | piod->piod_offs = NETBSD32PTR64(piod32.piod_offs); |
| 73 | piod->piod_addr = NETBSD32PTR64(piod32.piod_addr); |
| 74 | piod->piod_len = (size_t)piod32.piod_len; |
| 75 | |
| 76 | return 0; |
| 77 | } |
| 78 | |
| 79 | static void |
| 80 | netbsd32_copyoutpiod(const struct ptrace_io_desc *piod, void *addr) |
| 81 | { |
| 82 | struct netbsd32_ptrace_io_desc piod32; |
| 83 | |
| 84 | piod32.piod_op = piod->piod_op; |
| 85 | NETBSD32PTR32(piod32.piod_offs, piod->piod_offs); |
| 86 | NETBSD32PTR32(piod32.piod_addr, piod->piod_addr); |
| 87 | piod32.piod_len = (netbsd32_size_t)piod->piod_len; |
| 88 | (void) copyout(&piod32, addr, sizeof(piod32)); |
| 89 | } |
| 90 | |
| 91 | |
| 92 | static int |
| 93 | netbsd32_doregs(struct lwp *curl /*tracer*/, |
| 94 | struct lwp *l /*traced*/, |
| 95 | struct uio *uio) |
| 96 | { |
| 97 | #if defined(PT_GETREGS) || defined(PT_SETREGS) |
| 98 | process_reg32 r32; |
| 99 | int error; |
| 100 | char *kv; |
| 101 | int kl; |
| 102 | |
| 103 | if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r32)) |
| 104 | return EINVAL; |
| 105 | |
| 106 | kl = sizeof(r32); |
| 107 | kv = (char *)&r32; |
| 108 | |
| 109 | kv += uio->uio_offset; |
| 110 | kl -= uio->uio_offset; |
| 111 | if ((size_t)kl > uio->uio_resid) |
| 112 | kl = uio->uio_resid; |
| 113 | error = process_read_regs32(l, &r32); |
| 114 | if (error == 0) |
| 115 | error = uiomove(kv, kl, uio); |
| 116 | if (error == 0 && uio->uio_rw == UIO_WRITE) { |
| 117 | if (l->l_stat != LSSTOP) |
| 118 | error = EBUSY; |
| 119 | else |
| 120 | error = process_write_regs32(l, &r32); |
| 121 | } |
| 122 | |
| 123 | uio->uio_offset = 0; |
| 124 | return error; |
| 125 | #else |
| 126 | return EINVAL; |
| 127 | #endif |
| 128 | } |
| 129 | |
| 130 | static int |
| 131 | netbsd32_dofpregs(struct lwp *curl /*tracer*/, |
| 132 | struct lwp *l /*traced*/, |
| 133 | struct uio *uio) |
| 134 | { |
| 135 | #if defined(PT_GETFPREGS) || defined(PT_SETFPREGS) |
| 136 | process_fpreg32 r32; |
| 137 | int error; |
| 138 | char *kv; |
| 139 | size_t kl; |
| 140 | |
| 141 | KASSERT(l->l_proc->p_flag & PK_32); |
| 142 | if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r32)) |
| 143 | return EINVAL; |
| 144 | kl = sizeof(r32); |
| 145 | kv = (char *)&r32; |
| 146 | |
| 147 | kv += uio->uio_offset; |
| 148 | kl -= uio->uio_offset; |
| 149 | if (kl > uio->uio_resid) |
| 150 | kl = uio->uio_resid; |
| 151 | |
| 152 | error = process_read_fpregs32(l, &r32, &kl); |
| 153 | if (error == 0) |
| 154 | error = uiomove(kv, kl, uio); |
| 155 | if (error == 0 && uio->uio_rw == UIO_WRITE) { |
| 156 | if (l->l_stat != LSSTOP) |
| 157 | error = EBUSY; |
| 158 | else |
| 159 | error = process_write_fpregs32(l, &r32, kl); |
| 160 | } |
| 161 | uio->uio_offset = 0; |
| 162 | return error; |
| 163 | #else |
| 164 | return EINVAL; |
| 165 | #endif |
| 166 | } |
| 167 | |
| 168 | static struct ptrace_methods netbsd32_ptm = { |
| 169 | .ptm_copyinpiod = netbsd32_copyinpiod, |
| 170 | .ptm_copyoutpiod = netbsd32_copyoutpiod, |
| 171 | .ptm_doregs = netbsd32_doregs, |
| 172 | .ptm_dofpregs = netbsd32_dofpregs |
| 173 | }; |
| 174 | |
| 175 | |
| 176 | int |
| 177 | netbsd32_ptrace(struct lwp *l, const struct netbsd32_ptrace_args *uap, |
| 178 | register_t *retval) |
| 179 | { |
| 180 | /* { |
| 181 | syscallarg(int) req; |
| 182 | syscallarg(pid_t) pid; |
| 183 | syscallarg(netbsd32_voidp *) addr; |
| 184 | syscallarg(int) data; |
| 185 | } */ |
| 186 | |
| 187 | return do_ptrace(&netbsd32_ptm, l, SCARG(uap, req), SCARG(uap, pid), |
| 188 | SCARG_P32(uap, addr), SCARG(uap, data), retval); |
| 189 | } |
| 190 | |
| 191 | static const struct syscall_package compat_ptrace_syscalls[] = { |
| 192 | { NETBSD32_SYS_netbsd32_ptrace, 0, (sy_call_t *)netbsd32_ptrace }, |
| 193 | { 0, 0, NULL }, |
| 194 | }; |
| 195 | |
| 196 | #define DEPS "compat_netbsd32,ptrace_common" |
| 197 | |
| 198 | MODULE(MODULE_CLASS_EXEC, compat_netbsd32_ptrace, DEPS); |
| 199 | |
| 200 | static int |
| 201 | compat_netbsd32_ptrace_modcmd(modcmd_t cmd, void *arg) |
| 202 | { |
| 203 | int error; |
| 204 | |
| 205 | switch (cmd) { |
| 206 | case MODULE_CMD_INIT: |
| 207 | error = syscall_establish(&emul_netbsd32, |
| 208 | compat_ptrace_syscalls); |
| 209 | break; |
| 210 | case MODULE_CMD_FINI: |
| 211 | error = syscall_disestablish(&emul_netbsd32, |
| 212 | compat_ptrace_syscalls); |
| 213 | break; |
| 214 | default: |
| 215 | error = ENOTTY; |
| 216 | break; |
| 217 | } |
| 218 | return error; |
| 219 | } |
| 220 | |