linux_ptrace.c revision 1.2.4.3
1 /* $NetBSD: linux_ptrace.c,v 1.2.4.3 2002/05/04 04:16:28 thorpej 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 1.2.4.3 2002/05/04 04:16:28 thorpej Exp $"); 42 43 #include <sys/param.h> 44 #include <sys/malloc.h> 45 #include <sys/mount.h> 46 #include <sys/proc.h> 47 #include <sys/ptrace.h> 48 #include <sys/systm.h> 49 #include <sys/syscallargs.h> 50 #include <uvm/uvm_extern.h> 51 52 #include <machine/reg.h> 53 54 #include <compat/linux/common/linux_types.h> 55 #include <compat/linux/common/linux_ptrace.h> 56 #include <compat/linux/common/linux_signal.h> 57 58 #include <compat/linux/common/linux_util.h> 59 #include <compat/linux/common/linux_machdep.h> 60 #include <compat/linux/common/linux_emuldata.h> 61 #include <compat/linux/common/linux_exec.h> /* for emul_linux */ 62 63 #include <compat/linux/linux_syscallargs.h> 64 65 #include <lib/libkern/libkern.h> /* for offsetof() */ 66 67 /* 68 * On ARMv2, uregs contains R0--R15, orig_R0. 69 * On ARMv3 and later, it's R0--R15, CPSR, orig_R0. 70 * As far as I can see, Linux doesn't initialise orig_R0 on ARMv2, so we 71 * just produce the ARMv3 version. 72 */ 73 74 struct linux_reg { 75 long uregs[18]; 76 }; 77 78 #define LINUX_REG_R0 0 79 #define LINUX_REG_R1 1 80 #define LINUX_REG_R2 2 81 #define LINUX_REG_R3 3 82 #define LINUX_REG_R4 4 83 #define LINUX_REG_R5 5 84 #define LINUX_REG_R6 6 85 #define LINUX_REG_R7 7 86 #define LINUX_REG_R8 8 87 #define LINUX_REG_R9 9 88 #define LINUX_REG_R10 10 89 #define LINUX_REG_FP 11 90 #define LINUX_REG_IP 12 91 #define LINUX_REG_SP 13 92 #define LINUX_REG_LR 14 93 #define LINUX_REG_PC 15 94 #define LINUX_REG_CPSR 16 95 #define LINUX_REG_ORIG_R0 17 96 97 /* Macros to clear/set/test flags. */ 98 #define SET(t, f) (t) |= (f) 99 #define CLR(t, f) (t) &= ~(f) 100 #define ISSET(t, f) ((t) & (f)) 101 102 int 103 linux_sys_ptrace_arch(l, v, retval) 104 struct lwp *l; 105 void *v; 106 register_t *retval; 107 { 108 struct linux_sys_ptrace_args /* { 109 syscallarg(int) request; 110 syscallarg(int) pid; 111 syscallarg(int) addr; 112 syscallarg(int) data; 113 } */ *uap = v; 114 struct proc *p = l->l_proc; 115 int request, error; 116 struct proc *t; /* target process */ 117 struct lwp *lt; 118 struct reg *regs = NULL; 119 struct fpreg *fpregs = NULL; 120 struct linux_reg *linux_regs = NULL; 121 struct linux_fpreg *linux_fpregs = NULL; 122 123 request = SCARG(uap, request); 124 125 if ((request != LINUX_PTRACE_GETREGS) && 126 (request != LINUX_PTRACE_SETREGS)) 127 return EIO; 128 129 /* Find the process we're supposed to be operating on. */ 130 if ((t = pfind(SCARG(uap, pid))) == NULL) 131 return ESRCH; 132 133 /* 134 * You can't do what you want to the process if: 135 * (1) It's not being traced at all, 136 */ 137 if (!ISSET(t->p_flag, P_TRACED)) 138 return EPERM; 139 140 /* 141 * (2) it's being traced by procfs (which has 142 * different signal delivery semantics), 143 */ 144 if (ISSET(t->p_flag, P_FSTRACE)) 145 return EBUSY; 146 147 /* 148 * (3) it's not being traced by _you_, or 149 */ 150 if (t->p_pptr != p) 151 return EBUSY; 152 153 /* 154 * (4) it's not currently stopped. 155 */ 156 if (t->p_stat != SSTOP || !ISSET(t->p_flag, P_WAITED)) 157 return EBUSY; 158 159 /* XXX NJWLWP 160 * The entire ptrace interface needs work to be useful to 161 * a process with multiple LWPs. For the moment, we'll 162 * just kluge this and fail on others. 163 */ 164 165 if (p->p_nlwps > 1) 166 return (ENOSYS); 167 168 lt = LIST_FIRST(&t->p_lwps); 169 170 *retval = 0; 171 172 switch (request) { 173 case LINUX_PTRACE_GETREGS: 174 MALLOC(regs, struct reg*, sizeof(struct reg), M_TEMP, M_WAITOK); 175 MALLOC(linux_regs, struct linux_reg*, sizeof(struct linux_reg), 176 M_TEMP, M_WAITOK); 177 178 error = process_read_regs(lt, regs); 179 if (error != 0) 180 goto out; 181 182 memcpy(linux_regs->uregs, regs->r, 13 * sizeof(register_t)); 183 linux_regs->uregs[LINUX_REG_SP] = regs->r_sp; 184 linux_regs->uregs[LINUX_REG_LR] = regs->r_lr; 185 linux_regs->uregs[LINUX_REG_PC] = regs->r_pc; 186 linux_regs->uregs[LINUX_REG_CPSR] = regs->r_cpsr; 187 linux_regs->uregs[LINUX_REG_ORIG_R0] = regs->r[0]; 188 189 error = copyout(linux_regs, (caddr_t)SCARG(uap, data), 190 sizeof(struct linux_reg)); 191 goto out; 192 193 case LINUX_PTRACE_SETREGS: 194 MALLOC(regs, struct reg*, sizeof(struct reg), M_TEMP, M_WAITOK); 195 MALLOC(linux_regs, struct linux_reg *, sizeof(struct linux_reg), 196 M_TEMP, M_WAITOK); 197 198 error = copyin((caddr_t)SCARG(uap, data), linux_regs, 199 sizeof(struct linux_reg)); 200 if (error != 0) 201 goto out; 202 203 memcpy(regs->r, linux_regs->uregs, 13 * sizeof(register_t)); 204 regs->r_sp = linux_regs->uregs[LINUX_REG_SP]; 205 regs->r_lr = linux_regs->uregs[LINUX_REG_LR]; 206 regs->r_pc = linux_regs->uregs[LINUX_REG_PC]; 207 regs->r_cpsr = linux_regs->uregs[LINUX_REG_CPSR]; 208 209 error = process_write_regs(lt, regs); 210 goto out; 211 212 default: 213 /* never reached */ 214 break; 215 } 216 217 return EIO; 218 219 out: 220 if (regs) 221 FREE(regs, M_TEMP); 222 if (fpregs) 223 FREE(fpregs, M_TEMP); 224 if (linux_regs) 225 FREE(linux_regs, M_TEMP); 226 if (linux_fpregs) 227 FREE(linux_fpregs, M_TEMP); 228 return (error); 229 230 } 231
Indexes created Mon Sep 29 21:09:56 GMT 2025