linux_ptrace.c revision 1.3
1 /* $NetBSD: linux_ptrace.c,v 1.3 2003/01/18 08:02:47 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 1.3 2003/01/18 08:02:47 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/sa.h> 50 #include <sys/syscallargs.h> 51 #include <uvm/uvm_extern.h> 52 53 #include <machine/reg.h> 54 55 #include <compat/linux/common/linux_types.h> 56 #include <compat/linux/common/linux_ptrace.h> 57 #include <compat/linux/common/linux_signal.h> 58 59 #include <compat/linux/common/linux_util.h> 60 #include <compat/linux/common/linux_machdep.h> 61 #include <compat/linux/common/linux_emuldata.h> 62 #include <compat/linux/common/linux_exec.h> /* for emul_linux */ 63 64 #include <compat/linux/linux_syscallargs.h> 65 66 #include <lib/libkern/libkern.h> /* for offsetof() */ 67 68 /* 69 * On ARMv2, uregs contains R0--R15, orig_R0. 70 * On ARMv3 and later, it's R0--R15, CPSR, orig_R0. 71 * As far as I can see, Linux doesn't initialise orig_R0 on ARMv2, so we 72 * just produce the ARMv3 version. 73 */ 74 75 struct linux_reg { 76 long uregs[18]; 77 }; 78 79 #define LINUX_REG_R0 0 80 #define LINUX_REG_R1 1 81 #define LINUX_REG_R2 2 82 #define LINUX_REG_R3 3 83 #define LINUX_REG_R4 4 84 #define LINUX_REG_R5 5 85 #define LINUX_REG_R6 6 86 #define LINUX_REG_R7 7 87 #define LINUX_REG_R8 8 88 #define LINUX_REG_R9 9 89 #define LINUX_REG_R10 10 90 #define LINUX_REG_FP 11 91 #define LINUX_REG_IP 12 92 #define LINUX_REG_SP 13 93 #define LINUX_REG_LR 14 94 #define LINUX_REG_PC 15 95 #define LINUX_REG_CPSR 16 96 #define LINUX_REG_ORIG_R0 17 97 98 /* Macros to clear/set/test flags. */ 99 #define SET(t, f) (t) |= (f) 100 #define CLR(t, f) (t) &= ~(f) 101 #define ISSET(t, f) ((t) & (f)) 102 103 int 104 linux_sys_ptrace_arch(l, v, retval) 105 struct lwp *l; 106 void *v; 107 register_t *retval; 108 { 109 struct linux_sys_ptrace_args /* { 110 syscallarg(int) request; 111 syscallarg(int) pid; 112 syscallarg(int) addr; 113 syscallarg(int) data; 114 } */ *uap = v; 115 struct proc *p = l->l_proc; 116 int request, error; 117 struct proc *t; /* target process */ 118 struct lwp *lt; 119 struct reg *regs = NULL; 120 struct fpreg *fpregs = NULL; 121 struct linux_reg *linux_regs = NULL; 122 struct linux_fpreg *linux_fpregs = NULL; 123 124 request = SCARG(uap, request); 125 126 if ((request != LINUX_PTRACE_GETREGS) && 127 (request != LINUX_PTRACE_SETREGS)) 128 return EIO; 129 130 /* Find the process we're supposed to be operating on. */ 131 if ((t = pfind(SCARG(uap, pid))) == NULL) 132 return ESRCH; 133 134 /* 135 * You can't do what you want to the process if: 136 * (1) It's not being traced at all, 137 */ 138 if (!ISSET(t->p_flag, P_TRACED)) 139 return EPERM; 140 141 /* 142 * (2) it's being traced by procfs (which has 143 * different signal delivery semantics), 144 */ 145 if (ISSET(t->p_flag, P_FSTRACE)) 146 return EBUSY; 147 148 /* 149 * (3) it's not being traced by _you_, or 150 */ 151 if (t->p_pptr != p) 152 return EBUSY; 153 154 /* 155 * (4) it's not currently stopped. 156 */ 157 if (t->p_stat != SSTOP || !ISSET(t->p_flag, P_WAITED)) 158 return EBUSY; 159 160 /* XXX NJWLWP 161 * The entire ptrace interface needs work to be useful to 162 * a process with multiple LWPs. For the moment, we'll 163 * just kluge this and fail on others. 164 */ 165 166 if (p->p_nlwps > 1) 167 return (ENOSYS); 168 169 lt = LIST_FIRST(&t->p_lwps); 170 171 *retval = 0; 172 173 switch (request) { 174 case LINUX_PTRACE_GETREGS: 175 MALLOC(regs, struct reg*, sizeof(struct reg), M_TEMP, M_WAITOK); 176 MALLOC(linux_regs, struct linux_reg*, sizeof(struct linux_reg), 177 M_TEMP, M_WAITOK); 178 179 error = process_read_regs(lt, regs); 180 if (error != 0) 181 goto out; 182 183 memcpy(linux_regs->uregs, regs->r, 13 * sizeof(register_t)); 184 linux_regs->uregs[LINUX_REG_SP] = regs->r_sp; 185 linux_regs->uregs[LINUX_REG_LR] = regs->r_lr; 186 linux_regs->uregs[LINUX_REG_PC] = regs->r_pc; 187 linux_regs->uregs[LINUX_REG_CPSR] = regs->r_cpsr; 188 linux_regs->uregs[LINUX_REG_ORIG_R0] = regs->r[0]; 189 190 error = copyout(linux_regs, (caddr_t)SCARG(uap, data), 191 sizeof(struct linux_reg)); 192 goto out; 193 194 case LINUX_PTRACE_SETREGS: 195 MALLOC(regs, struct reg*, sizeof(struct reg), M_TEMP, M_WAITOK); 196 MALLOC(linux_regs, struct linux_reg *, sizeof(struct linux_reg), 197 M_TEMP, M_WAITOK); 198 199 error = copyin((caddr_t)SCARG(uap, data), linux_regs, 200 sizeof(struct linux_reg)); 201 if (error != 0) 202 goto out; 203 204 memcpy(regs->r, linux_regs->uregs, 13 * sizeof(register_t)); 205 regs->r_sp = linux_regs->uregs[LINUX_REG_SP]; 206 regs->r_lr = linux_regs->uregs[LINUX_REG_LR]; 207 regs->r_pc = linux_regs->uregs[LINUX_REG_PC]; 208 regs->r_cpsr = linux_regs->uregs[LINUX_REG_CPSR]; 209 210 error = process_write_regs(lt, regs); 211 goto out; 212 213 default: 214 /* never reached */ 215 break; 216 } 217 218 return EIO; 219 220 out: 221 if (regs) 222 FREE(regs, M_TEMP); 223 if (fpregs) 224 FREE(fpregs, M_TEMP); 225 if (linux_regs) 226 FREE(linux_regs, M_TEMP); 227 if (linux_fpregs) 228 FREE(linux_fpregs, M_TEMP); 229 return (error); 230 231 } 232
Indexes created Fri Sep 26 08:10:20 GMT 2025