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 <stdlib.h> 25 #include <sys/types.h> 26 #include <sys/wait.h> 27 #include <signal.h> 28 #include <string.h> 29 #include "ptrace.h" 30 #include "proc.h" 31 #include "common.h" 32 33 void 34 get_arch_dep(struct process *proc) 35 { 36 proc_archdep *a; 37 if (!proc->arch_ptr) 38 proc->arch_ptr = (void *)malloc(sizeof(proc_archdep)); 39 a = (proc_archdep *) (proc->arch_ptr); 40 a->valid = (ptrace(PTRACE_GETREGS, proc->pid, &a->regs, 0) >= 0); 41 } 42 43 /* Returns syscall number if `pid' stopped because of a syscall. 44 * Returns -1 otherwise 45 */ 46 int 47 syscall_p(struct process *proc, int status, int *sysnum) 48 { 49 if (WIFSTOPPED(status) 50 && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) { 51 void *ip = get_instruction_pointer(proc); 52 unsigned int insn; 53 if (ip == (void *)-1) 54 return 0; 55 insn = ptrace(PTRACE_PEEKTEXT, proc->pid, ip, 0); 56 if ((insn & 0xc1f8007f) == 0x81d00010) { 57 *sysnum = ((proc_archdep *) proc->arch_ptr)->regs.u_regs[UREG_G0]; 58 if (proc->callstack_depth > 0 && 59 proc->callstack[proc->callstack_depth - 1].is_syscall && 60 proc->callstack[proc->callstack_depth - 1].c_un.syscall == *sysnum) { 61 return 2; 62 } else if (*sysnum >= 0) { 63 return 1; 64 } 65 } 66 } 67 return 0; 68 } 69 70 long 71 gimme_arg(enum tof type, struct process *proc, int arg_num, 72 struct arg_type_info *info) 73 { 74 proc_archdep *a = (proc_archdep *) proc->arch_ptr; 75 if (!a->valid) { 76 fprintf(stderr, "Could not get child registers\n"); 77 exit(1); 78 } 79 if (arg_num == -1) /* return value */ 80 return a->regs.u_regs[UREG_G7]; 81 82 if (type == LT_TOF_FUNCTION || type == LT_TOF_SYSCALL || arg_num >= 6) { 83 if (arg_num < 6) 84 return ((int *)&a->regs.u_regs[UREG_G7])[arg_num]; 85 return ptrace(PTRACE_PEEKTEXT, proc->pid, 86 proc->stack_pointer + 64 * (arg_num + 1)); 87 } else if (type == LT_TOF_FUNCTIONR) 88 return a->func_arg[arg_num]; 89 else if (type == LT_TOF_SYSCALLR) 90 return a->sysc_arg[arg_num]; 91 else { 92 fprintf(stderr, "gimme_arg called with wrong arguments\n"); 93 exit(1); 94 } 95 return 0; 96 } 97
