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/*
* This file is part of ltrace.
* Copyright (C) 2014 Petr Machata, Red Hat, Inc.
*
* 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
*/
#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <asm/ptrace.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include "backend.h"
#include "proc.h"
void
get_arch_dep(struct process *proc)
{
}
int aarch64_read_gregs(struct process *proc, struct user_pt_regs *regs);
/* The syscall instruction is:
* | 31 21 | 20 5 | 4 0 |
* | 1 1 0 1 0 1 0 0 | 0 0 0 | imm16 | 0 0 0 0 1 | */
#define SVC_MASK 0xffe0001f
#define SVC_VALUE 0xd4000001
int
syscall_p(struct process *proc, int status, int *sysnum)
{
if (WIFSTOPPED(status)
&& WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
struct user_pt_regs regs;
if (aarch64_read_gregs(proc, ®s) < 0) {
fprintf(stderr, "syscall_p: "
"Couldn't read registers of %d.\n", proc->pid);
return -1;
}
errno = 0;
unsigned long insn = (unsigned long) ptrace(PTRACE_PEEKTEXT,
proc->pid,
regs.pc - 4, 0);
if (insn == -1UL && errno != 0) {
fprintf(stderr, "syscall_p: "
"Couldn't peek into %d: %s\n", proc->pid,
strerror(errno));
return -1;
}
insn &= 0xffffffffUL;
if ((insn & SVC_MASK) == SVC_VALUE) {
*sysnum = regs.regs[8];
size_t d1 = proc->callstack_depth - 1;
if (proc->callstack_depth > 0
&& proc->callstack[d1].is_syscall
&& proc->callstack[d1].c_un.syscall == *sysnum)
return 2;
return 1;
}
}
return 0;
}
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