linux_ptrace.c revision 1.5
1 /* $NetBSD: linux_ptrace.c,v 1.5 2006/08/30 11:14:39 matt Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matthias Scheler. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 40 #include <sys/cdefs.h> 41 __KERNEL_RCSID(0, "$NetBSD: linux_ptrace.c,v 1.5 2006/08/30 11:14:39 matt Exp $"); 42 #include "opt_ptrace.h" 43 44 #include <sys/param.h> 45 #include <sys/malloc.h> 46 #include <sys/mount.h> 47 #include <sys/proc.h> 48 #include <sys/ptrace.h> 49 #include <sys/systm.h> 50 #include <sys/sa.h> 51 #include <sys/syscallargs.h> 52 #include <uvm/uvm_extern.h> 53 54 #include <machine/reg.h> 55 56 #include <compat/linux/common/linux_types.h> 57 #include <compat/linux/common/linux_ptrace.h> 58 #include <compat/linux/common/linux_signal.h> 59 60 #include <compat/linux/common/linux_util.h> 61 #include <compat/linux/common/linux_machdep.h> 62 #include <compat/linux/common/linux_emuldata.h> 63 #include <compat/linux/common/linux_exec.h> /* for emul_linux */ 64 65 #include <compat/linux/linux_syscallargs.h> 66 67 #include <lib/libkern/libkern.h> /* for offsetof() */ 68 69 /* 70 * On ARMv2, uregs contains R0--R15, orig_R0. 71 * On ARMv3 and later, it's R0--R15, CPSR, orig_R0. 72 * As far as I can see, Linux doesn't initialise orig_R0 on ARMv2, so we 73 * just produce the ARMv3 version. 74 */ 75 76 struct linux_reg { 77 long uregs[18]; 78 }; 79 80 #define LINUX_REG_R0 0 81 #define LINUX_REG_R1 1 82 #define LINUX_REG_R2 2 83 #define LINUX_REG_R3 3 84 #define LINUX_REG_R4 4 85 #define LINUX_REG_R5 5 86 #define LINUX_REG_R6 6 87 #define LINUX_REG_R7 7 88 #define LINUX_REG_R8 8 89 #define LINUX_REG_R9 9 90 #define LINUX_REG_R10 10 91 #define LINUX_REG_FP 11 92 #define LINUX_REG_IP 12 93 #define LINUX_REG_SP 13 94 #define LINUX_REG_LR 14 95 #define LINUX_REG_PC 15 96 #define LINUX_REG_CPSR 16 97 #define LINUX_REG_ORIG_R0 17 98 99 int 100 linux_sys_ptrace_arch(l, v, retval) 101 struct lwp *l; 102 void *v; 103 register_t *retval; 104 { 105 struct linux_sys_ptrace_args /* { 106 syscallarg(int) request; 107 syscallarg(int) pid; 108 syscallarg(int) addr; 109 syscallarg(int) data; 110 } */ *uap = v; 111 struct proc *p = l->l_proc; 112 int request, error; 113 struct proc *t; /* target process */ 114 struct lwp *lt; 115 struct reg *regs = NULL; 116 struct fpreg *fpregs = NULL; 117 struct linux_reg *linux_regs = NULL; 118 struct linux_fpreg *linux_fpregs = NULL; 119 120 request = SCARG(uap, request); 121 122 if ((request != LINUX_PTRACE_GETREGS) && 123 (request != LINUX_PTRACE_SETREGS)) 124 return EIO; 125 126 /* Find the process we're supposed to be operating on. */ 127 if ((t = pfind(SCARG(uap, pid))) == NULL) 128 return ESRCH; 129 130 /* 131 * You can't do what you want to the process if: 132 * (1) It's not being traced at all, 133 */ 134 if (!ISSET(t->p_flag, P_TRACED)) 135 return EPERM; 136 137 /* 138 * (2) it's being traced by procfs (which has 139 * different signal delivery semantics), 140 */ 141 if (ISSET(t->p_flag, P_FSTRACE)) 142 return EBUSY; 143 144 /* 145 * (3) it's not being traced by _you_, or 146 */ 147 if (t->p_pptr != p) 148 return EBUSY; 149 150 /* 151 * (4) it's not currently stopped. 152 */ 153 if (t->p_stat != SSTOP || !ISSET(t->p_flag, P_WAITED)) 154 return EBUSY; 155 156 /* XXX NJWLWP 157 * The entire ptrace interface needs work to be useful to 158 * a process with multiple LWPs. For the moment, we'll 159 * just kluge this and fail on others. 160 */ 161 162 if (p->p_nlwps > 1) 163 return (ENOSYS); 164 165 lt = LIST_FIRST(&t->p_lwps); 166 167 *retval = 0; 168 169 switch (request) { 170 case LINUX_PTRACE_GETREGS: 171 MALLOC(regs, struct reg*, sizeof(struct reg), M_TEMP, M_WAITOK); 172 MALLOC(linux_regs, struct linux_reg*, sizeof(struct linux_reg), 173 M_TEMP, M_WAITOK); 174 175 error = process_read_regs(lt, regs); 176 if (error != 0) 177 goto out; 178 179 memcpy(linux_regs->uregs, regs->r, 13 * sizeof(register_t)); 180 linux_regs->uregs[LINUX_REG_SP] = regs->r_sp; 181 linux_regs->uregs[LINUX_REG_LR] = regs->r_lr; 182 linux_regs->uregs[LINUX_REG_PC] = regs->r_pc; 183 linux_regs->uregs[LINUX_REG_CPSR] = regs->r_cpsr; 184 linux_regs->uregs[LINUX_REG_ORIG_R0] = regs->r[0]; 185 186 error = copyout(linux_regs, (caddr_t)SCARG(uap, data), 187 sizeof(struct linux_reg)); 188 goto out; 189 190 case LINUX_PTRACE_SETREGS: 191 MALLOC(regs, struct reg*, sizeof(struct reg), M_TEMP, M_WAITOK); 192 MALLOC(linux_regs, struct linux_reg *, sizeof(struct linux_reg), 193 M_TEMP, M_WAITOK); 194 195 error = copyin((caddr_t)SCARG(uap, data), linux_regs, 196 sizeof(struct linux_reg)); 197 if (error != 0) 198 goto out; 199 200 memcpy(regs->r, linux_regs->uregs, 13 * sizeof(register_t)); 201 regs->r_sp = linux_regs->uregs[LINUX_REG_SP]; 202 regs->r_lr = linux_regs->uregs[LINUX_REG_LR]; 203 regs->r_pc = linux_regs->uregs[LINUX_REG_PC]; 204 regs->r_cpsr = linux_regs->uregs[LINUX_REG_CPSR]; 205 206 error = process_write_regs(lt, regs); 207 goto out; 208 209 default: 210 /* never reached */ 211 break; 212 } 213 214 return EIO; 215 216 out: 217 if (regs) 218 FREE(regs, M_TEMP); 219 if (fpregs) 220 FREE(fpregs, M_TEMP); 221 if (linux_regs) 222 FREE(linux_regs, M_TEMP); 223 if (linux_fpregs) 224 FREE(linux_fpregs, M_TEMP); 225 return (error); 226 227 } 228
Indexes created Tue Sep 30 10:09:55 GMT 2025