/*
* This file is part of ltrace.
* Copyright (C) 2010 Edgar E. Iglesias
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <sys/ptrace.h>
#include <asm/ptrace.h>
#include <elf.h>
#include "proc.h"
#include "common.h"
#if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
# define PTRACE_PEEKUSER PTRACE_PEEKUSR
#endif
#if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR))
# define PTRACE_POKEUSER PTRACE_POKEUSR
#endif
void get_arch_dep(struct process *proc)
{
}
/* Returns 1 if syscall, 2 if sysret, 0 otherwise.
*/
#define SYSCALL_INSN 0xe93d
int syscall_p(struct process *proc, int status, int *sysnum)
{
if (WIFSTOPPED(status)
&& WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
long pc = (long)get_instruction_pointer(proc);
unsigned int insn =
(int)ptrace(PTRACE_PEEKTEXT, proc->pid, pc - sizeof(long),
0);
if ((insn >> 16) == SYSCALL_INSN) {
*sysnum =
(int)ptrace(PTRACE_PEEKUSER, proc->pid,
sizeof(long) * PT_R9, 0);
if (proc->callstack_depth > 0
&& proc->callstack[proc->callstack_depth -
1].is_syscall) {
return 2;
}
return 1;
}
}
return 0;
}
long gimme_arg(enum tof type, struct process *proc, int arg_num,
struct arg_type_info *info)
{
int pid = proc->pid;
if (arg_num == -1) { /* return value */
return ptrace(PTRACE_PEEKUSER, pid, PT_R10 * 4, 0);
} else if (arg_num < 6) {
int pt_arg[6] =
{
PT_ORIG_R10, PT_R11, PT_R12, PT_R13, PT_MOF,
PT_SRP
};
return ptrace(PTRACE_PEEKUSER, pid, pt_arg[arg_num] * 4, 0);
} else {
return ptrace(PTRACE_PEEKDATA, pid,
proc->stack_pointer + 4 * (arg_num - 6), 0);
}
return 0;
}