| /* |
| * This file is part of ltrace. |
| * Copyright (C) 2011,2012,2013 Petr Machata, Red Hat Inc. |
| * Copyright (C) 2008,2009 Juan Cespedes |
| * Copyright (C) 2006 Ian Wienand |
| * |
| * 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 "config.h" |
| |
| #include <sys/types.h> |
| #include <sys/ptrace.h> |
| #include <errno.h> |
| |
| #include <asm/ptrace_offsets.h> |
| #include <asm/rse.h> |
| |
| #include <stddef.h> |
| #include "proc.h" |
| #include "common.h" |
| |
| void * |
| get_instruction_pointer(struct process *proc) |
| { |
| unsigned long ip = ptrace(PTRACE_PEEKUSER, proc->pid, PT_CR_IIP, 0); |
| unsigned long slot = |
| (ptrace(PTRACE_PEEKUSER, proc->pid, PT_CR_IPSR, 0) >> 41) & 3; |
| |
| return (void *)(ip | slot); |
| } |
| |
| void |
| set_instruction_pointer(struct process *proc, void *addr) |
| { |
| |
| unsigned long newip = (unsigned long)addr; |
| unsigned long slot = (unsigned long)addr & 0xf; |
| unsigned long psr = ptrace(PTRACE_PEEKUSER, proc->pid, PT_CR_IPSR, 0); |
| |
| psr &= ~(3UL << 41); |
| psr |= (slot & 0x3) << 41; |
| |
| newip &= ~0xfUL; |
| |
| ptrace(PTRACE_POKEUSER, proc->pid, PT_CR_IIP, (long)newip); |
| ptrace(PTRACE_POKEUSER, proc->pid, PT_CR_IPSR, psr); |
| } |
| |
| void * |
| get_stack_pointer(struct process *proc) |
| { |
| long l = ptrace(PTRACE_PEEKUSER, proc->pid, PT_R12, 0); |
| if (l == -1 && errno) |
| return NULL; |
| return (void *)l; |
| } |
| |
| void * |
| get_return_addr(struct process *proc, void *stack_pointer) |
| { |
| long l = ptrace(PTRACE_PEEKUSER, proc->pid, PT_B0, 0); |
| if (l == -1 && errno) |
| return NULL; |
| return (void *)l; |
| } |