109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
/*
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* This file is part of ltrace.
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* Copyright (C) 2012,2013 Petr Machata, Red Hat Inc.
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* Copyright (C) 1998,2002,2004,2008,2009 Juan Cespedes
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* Copyright (C) 2006 Ian Wienand
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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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#include "config.h"
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <sys/reg.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include "backend.h"
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#include "proc.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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#ifdef __x86_64__
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# define XIP (8 * RIP)
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# define XSP (8 * RSP)
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#else
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# define XIP (4 * EIP)
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# define XSP (4 * UESP)
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#endif
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static arch_addr_t
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conv_32(arch_addr_t val)
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{
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/* XXX Drop the multiple double casts when arch_addr_t
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* becomes integral. */
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return (arch_addr_t)(uintptr_t)(uint32_t)(uintptr_t)val;
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}
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void *
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get_instruction_pointer(struct process *proc)
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{
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long int ret = ptrace(PTRACE_PEEKUSER, proc->pid, XIP, 0);
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if (proc->e_machine == EM_386)
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ret &= 0xffffffff;
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return (void *)ret;
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}
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void
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set_instruction_pointer(struct process *proc, arch_addr_t addr)
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{
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if (proc->e_machine == EM_386)
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addr = conv_32(addr);
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ptrace(PTRACE_POKEUSER, proc->pid, XIP, addr);
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}
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void *
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get_stack_pointer(struct process *proc)
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{
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long sp = ptrace(PTRACE_PEEKUSER, proc->pid, XSP, 0);
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if (sp == -1 && errno) {
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fprintf(stderr, "Couldn't read SP register: %s\n",
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strerror(errno));
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return NULL;
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}
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/* XXX Drop the multiple double casts when arch_addr_t
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* becomes integral. */
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arch_addr_t ret = (arch_addr_t)(uintptr_t)sp;
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if (proc->e_machine == EM_386)
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ret = conv_32(ret);
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return ret;
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}
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void *
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get_return_addr(struct process *proc, void *sp)
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{
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long a = ptrace(PTRACE_PEEKTEXT, proc->pid, sp, 0);
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if (a == -1 && errno) {
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fprintf(stderr, "Couldn't read return value: %s\n",
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strerror(errno));
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return NULL;
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}
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/* XXX Drop the multiple double casts when arch_addr_t
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* becomes integral. */
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arch_addr_t ret = (arch_addr_t)(uintptr_t)a;
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if (proc->e_machine == EM_386)
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ret = conv_32(ret);
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return ret;
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}
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