| /* |
| * 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; |
| } |