1 /* 2 * This file is part of ltrace. 3 * Copyright (C) 2010 Edgar E. Iglesias 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation; either version 2 of the 8 * License, or (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 18 * 02110-1301 USA 19 */ 20 21 #if HAVE_CONFIG_H 22 #include "config.h" 23 #endif 24 25 #include <sys/types.h> 26 #include <sys/wait.h> 27 #include <signal.h> 28 #include <sys/ptrace.h> 29 #include <asm/ptrace.h> 30 #include <elf.h> 31 32 #include "proc.h" 33 #include "common.h" 34 35 #if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR)) 36 # define PTRACE_PEEKUSER PTRACE_PEEKUSR 37 #endif 38 39 #if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR)) 40 # define PTRACE_POKEUSER PTRACE_POKEUSR 41 #endif 42 43 void get_arch_dep(struct process *proc) 44 { 45 } 46 47 /* Returns 1 if syscall, 2 if sysret, 0 otherwise. 48 */ 49 #define SYSCALL_INSN 0xe93d 50 int syscall_p(struct process *proc, int status, int *sysnum) 51 { 52 if (WIFSTOPPED(status) 53 && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) { 54 long pc = (long)get_instruction_pointer(proc); 55 unsigned int insn = 56 (int)ptrace(PTRACE_PEEKTEXT, proc->pid, pc - sizeof(long), 57 0); 58 59 if ((insn >> 16) == SYSCALL_INSN) { 60 *sysnum = 61 (int)ptrace(PTRACE_PEEKUSER, proc->pid, 62 sizeof(long) * PT_R9, 0); 63 if (proc->callstack_depth > 0 64 && proc->callstack[proc->callstack_depth - 65 1].is_syscall) { 66 return 2; 67 } 68 return 1; 69 } 70 } 71 return 0; 72 } 73 74 long gimme_arg(enum tof type, struct process *proc, int arg_num, 75 struct arg_type_info *info) 76 { 77 int pid = proc->pid; 78 79 if (arg_num == -1) { /* return value */ 80 return ptrace(PTRACE_PEEKUSER, pid, PT_R10 * 4, 0); 81 } else if (arg_num < 6) { 82 int pt_arg[6] = 83 { 84 PT_ORIG_R10, PT_R11, PT_R12, PT_R13, PT_MOF, 85 PT_SRP 86 }; 87 return ptrace(PTRACE_PEEKUSER, pid, pt_arg[arg_num] * 4, 0); 88 } else { 89 return ptrace(PTRACE_PEEKDATA, pid, 90 proc->stack_pointer + 4 * (arg_num - 6), 0); 91 } 92 return 0; 93 } 94
