1 /* 2 * This file is part of ltrace. 3 * Copyright (C) 2004,2008,2009 Juan Cespedes 4 * Copyright (C) 2006 Ian Wienand 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of the 9 * License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, but 12 * WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 19 * 02110-1301 USA 20 */ 21 22 #include "config.h" 23 24 #include <sys/types.h> 25 #include <sys/wait.h> 26 #include <signal.h> 27 #include <sys/ptrace.h> 28 #include <asm/ptrace.h> 29 30 #include "proc.h" 31 #include "common.h" 32 #include "debug.h" 33 34 #if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR)) 35 # define PTRACE_PEEKUSER PTRACE_PEEKUSR 36 #endif 37 38 #if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR)) 39 # define PTRACE_POKEUSER PTRACE_POKEUSR 40 #endif 41 42 void 43 get_arch_dep(struct process *proc) 44 { 45 } 46 47 /* Returns 1 if syscall, 2 if sysret, 0 otherwise. 48 */ 49 int 50 syscall_p(struct process *proc, int status, int *sysnum) 51 { 52 if (WIFSTOPPED(status) 53 && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) { 54 char *ip = get_instruction_pointer(proc) - 4; 55 long x = ptrace(PTRACE_PEEKTEXT, proc->pid, ip, 0); 56 debug(2, "instr: %016lx", x); 57 if ((x & 0xffffffff) != 0x00000083) 58 return 0; 59 *sysnum = 60 ptrace(PTRACE_PEEKUSER, proc->pid, 0 /* REG_R0 */ , 0); 61 if (proc->callstack_depth > 0 && 62 proc->callstack[proc->callstack_depth - 1].is_syscall && 63 proc->callstack[proc->callstack_depth - 1].c_un.syscall == *sysnum) { 64 return 2; 65 } 66 if (*sysnum >= 0 && *sysnum < 500) { 67 return 1; 68 } 69 } 70 return 0; 71 } 72 73 long 74 gimme_arg(enum tof type, struct process *proc, int arg_num, 75 struct arg_type_info *info) 76 { 77 if (arg_num == -1) { /* return value */ 78 return ptrace(PTRACE_PEEKUSER, proc->pid, 0 /* REG_R0 */ , 0); 79 } 80 81 if (type == LT_TOF_FUNCTION || type == LT_TOF_FUNCTIONR) { 82 if (arg_num <= 5) 83 return ptrace(PTRACE_PEEKUSER, proc->pid, 84 arg_num + 16 /* REG_A0 */ , 0); 85 else 86 return ptrace(PTRACE_PEEKTEXT, proc->pid, 87 proc->stack_pointer + 8 * (arg_num - 6), 88 0); 89 } else if (type == LT_TOF_SYSCALL || type == LT_TOF_SYSCALLR) { 90 return ptrace(PTRACE_PEEKUSER, proc->pid, 91 arg_num + 16 /* REG_A0 */ , 0); 92 } else { 93 fprintf(stderr, "gimme_arg called with wrong arguments\n"); 94 exit(1); 95 } 96 return 0; 97 } 98
