linux_ptrace.c revision 1.13.2.1
1 /* $NetBSD: linux_ptrace.c,v 1.13.2.1 2008/05/10 23:48:52 wrstuden 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 * 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 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: linux_ptrace.c,v 1.13.2.1 2008/05/10 23:48:52 wrstuden Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/malloc.h> 38 #include <sys/mount.h> 39 #include <sys/proc.h> 40 #include <sys/ptrace.h> 41 #include <sys/systm.h> 42 #include <sys/sa.h> 43 #include <sys/syscallargs.h> 44 #include <uvm/uvm_extern.h> 45 46 #include <machine/reg.h> 47 48 #include <compat/linux/common/linux_types.h> 49 #include <compat/linux/common/linux_ptrace.h> 50 #include <compat/linux/common/linux_signal.h> 51 52 #include <compat/linux/common/linux_util.h> 53 #include <compat/linux/common/linux_machdep.h> 54 #include <compat/linux/common/linux_emuldata.h> 55 #include <compat/linux/common/linux_exec.h> /* for emul_linux */ 56 57 #include <compat/linux/linux_syscallargs.h> 58 59 #include <lib/libkern/libkern.h> /* for offsetof() */ 60 61 /* 62 * On ARMv2, uregs contains R0--R15, orig_R0. 63 * On ARMv3 and later, it's R0--R15, CPSR, orig_R0. 64 * As far as I can see, Linux doesn't initialise orig_R0 on ARMv2, so we 65 * just produce the ARMv3 version. 66 */ 67 68 struct linux_reg { 69 long uregs[18]; 70 }; 71 72 #define LINUX_REG_R0 0 73 #define LINUX_REG_R1 1 74 #define LINUX_REG_R2 2 75 #define LINUX_REG_R3 3 76 #define LINUX_REG_R4 4 77 #define LINUX_REG_R5 5 78 #define LINUX_REG_R6 6 79 #define LINUX_REG_R7 7 80 #define LINUX_REG_R8 8 81 #define LINUX_REG_R9 9 82 #define LINUX_REG_R10 10 83 #define LINUX_REG_FP 11 84 #define LINUX_REG_IP 12 85 #define LINUX_REG_SP 13 86 #define LINUX_REG_LR 14 87 #define LINUX_REG_PC 15 88 #define LINUX_REG_CPSR 16 89 #define LINUX_REG_ORIG_R0 17 90 91 int linux_ptrace_disabled = 1; /* bitrotted */ 92 93 int 94 linux_sys_ptrace_arch(struct lwp *l, const struct linux_sys_ptrace_args *uap, register_t *retval) 95 { 96 /* { 97 syscallarg(int) request; 98 syscallarg(int) pid; 99 syscallarg(int) addr; 100 syscallarg(int) data; 101 } */ 102 struct proc *p = l->l_proc; 103 int request, error; 104 struct proc *t; /* target process */ 105 struct lwp *lt; 106 struct reg *regs = NULL; 107 struct fpreg *fpregs = NULL; 108 struct linux_reg *linux_regs = NULL; 109 struct linux_fpreg *linux_fpregs = NULL; 110 111 if (linux_ptrace_disabled) 112 return ENOSYS; 113 114 request = SCARG(uap, request); 115 116 if ((request != LINUX_PTRACE_GETREGS) && 117 (request != LINUX_PTRACE_SETREGS)) 118 return EIO; 119 120 /* Find the process we're supposed to be operating on. */ 121 if ((t = pfind(SCARG(uap, pid))) == NULL) 122 return ESRCH; 123 124 /* 125 * You can't do what you want to the process if: 126 * (1) It's not being traced at all, 127 */ 128 if (!ISSET(t->p_slflag, PSL_TRACED)) 129 return EPERM; 130 131 /* 132 * (2) it's being traced by procfs (which has 133 * different signal delivery semantics), 134 */ 135 if (ISSET(t->p_slflag, PSL_FSTRACE)) 136 return EBUSY; 137 138 /* 139 * (3) it's not being traced by _you_, or 140 */ 141 if (t->p_pptr != p) 142 return EBUSY; 143 144 /* 145 * (4) it's not currently stopped. 146 */ 147 if (t->p_stat != SSTOP || !t->p_waited) 148 return EBUSY; 149 150 /* XXX NJWLWP 151 * The entire ptrace interface needs work to be useful to 152 * a process with multiple LWPs. For the moment, we'll 153 * just kluge this and fail on others. 154 */ 155 156 if (p->p_nlwps > 1) 157 return (ENOSYS); 158 159 lt = LIST_FIRST(&t->p_lwps); 160 161 *retval = 0; 162 163 switch (request) { 164 case LINUX_PTRACE_GETREGS: 165 MALLOC(regs, struct reg*, sizeof(struct reg), M_TEMP, M_WAITOK); 166 MALLOC(linux_regs, struct linux_reg*, sizeof(struct linux_reg), 167 M_TEMP, M_WAITOK); 168 169 error = process_read_regs(lt, regs); 170 if (error != 0) 171 goto out; 172 173 memcpy(linux_regs->uregs, regs->r, 13 * sizeof(register_t)); 174 linux_regs->uregs[LINUX_REG_SP] = regs->r_sp; 175 linux_regs->uregs[LINUX_REG_LR] = regs->r_lr; 176 linux_regs->uregs[LINUX_REG_PC] = regs->r_pc; 177 linux_regs->uregs[LINUX_REG_CPSR] = regs->r_cpsr; 178 linux_regs->uregs[LINUX_REG_ORIG_R0] = regs->r[0]; 179 180 error = copyout(linux_regs, (void *)SCARG(uap, data), 181 sizeof(struct linux_reg)); 182 goto out; 183 184 case LINUX_PTRACE_SETREGS: 185 MALLOC(regs, struct reg*, sizeof(struct reg), M_TEMP, M_WAITOK); 186 MALLOC(linux_regs, struct linux_reg *, sizeof(struct linux_reg), 187 M_TEMP, M_WAITOK); 188 189 error = copyin((void *)SCARG(uap, data), linux_regs, 190 sizeof(struct linux_reg)); 191 if (error != 0) 192 goto out; 193 194 memcpy(regs->r, linux_regs->uregs, 13 * sizeof(register_t)); 195 regs->r_sp = linux_regs->uregs[LINUX_REG_SP]; 196 regs->r_lr = linux_regs->uregs[LINUX_REG_LR]; 197 regs->r_pc = linux_regs->uregs[LINUX_REG_PC]; 198 regs->r_cpsr = linux_regs->uregs[LINUX_REG_CPSR]; 199 200 error = process_write_regs(lt, regs); 201 goto out; 202 203 default: 204 /* never reached */ 205 break; 206 } 207 208 return EIO; 209 210 out: 211 if (regs) 212 FREE(regs, M_TEMP); 213 if (fpregs) 214 FREE(fpregs, M_TEMP); 215 if (linux_regs) 216 FREE(linux_regs, M_TEMP); 217 if (linux_fpregs) 218 FREE(linux_fpregs, M_TEMP); 219 return (error); 220 221 } 222
Indexes created Mon Sep 29 21:09:56 GMT 2025