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