191 lines
4 KiB
C
191 lines
4 KiB
C
/*
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* This file is part of ltrace.
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* Copyright (C) 2010,2011,2012 Petr Machata, Red Hat Inc.
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* Copyright (C) 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/reg.h>
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#include <sys/wait.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#include "backend.h"
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#include "debug.h"
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#include "proc.h"
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#include "ptrace.h"
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#include "type.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 ORIG_XAX (8 * ORIG_RAX)
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#else
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# define ORIG_XAX (4 * ORIG_EAX)
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#endif
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#ifdef __x86_64__
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static const int x86_64 = 1;
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#else
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static const int x86_64 = 0;
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#endif
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void
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get_arch_dep(struct process *proc)
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{
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/* Unfortunately there are still remnants of mask_32bit uses
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* around. */
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if (proc->e_machine == EM_X86_64) {
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proc->mask_32bit = 0;
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proc->personality = 1;
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} else if (x86_64) { /* x86_64/i386 */
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proc->mask_32bit = 1;
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proc->personality = 0;
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} else {
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proc->mask_32bit = 0;
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proc->personality = 0;
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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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int
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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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struct callstack_element *elem = NULL;
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if (proc->callstack_depth > 0)
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elem = proc->callstack + proc->callstack_depth - 1;
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long int ret = ptrace(PTRACE_PEEKUSER, proc->pid, ORIG_XAX, 0);
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if (ret == -1) {
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if (errno)
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return -1;
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/* Otherwise, ORIG_RAX == -1 means that the
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* system call should not be restarted. In
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* that case rely on what we have on
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* stack. */
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if (elem != NULL && elem->is_syscall)
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ret = elem->c_un.syscall;
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}
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*sysnum = ret;
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debug(DEBUG_FUNCTION, "sysnum=%ld %p %d", ret,
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get_instruction_pointer(proc), errno);
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if (elem != NULL && elem->is_syscall
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&& elem->c_un.syscall == *sysnum)
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return 2;
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if (*sysnum >= 0)
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return 1;
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}
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return 0;
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}
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size_t
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arch_type_sizeof(struct process *proc, struct arg_type_info *info)
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{
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if (proc == NULL)
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return (size_t)-2;
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switch (info->type) {
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case ARGTYPE_VOID:
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return 0;
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case ARGTYPE_CHAR:
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return 1;
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case ARGTYPE_SHORT:
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case ARGTYPE_USHORT:
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return 2;
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case ARGTYPE_INT:
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case ARGTYPE_UINT:
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return 4;
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case ARGTYPE_LONG:
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case ARGTYPE_ULONG:
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case ARGTYPE_POINTER:
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return proc->e_machine == EM_X86_64 ? 8 : 4;
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case ARGTYPE_FLOAT:
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return 4;
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case ARGTYPE_DOUBLE:
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return 8;
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case ARGTYPE_ARRAY:
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case ARGTYPE_STRUCT:
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/* Use default value. */
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return (size_t)-2;
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default:
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assert(info->type != info->type);
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abort();
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}
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}
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size_t
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arch_type_alignof(struct process *proc, struct arg_type_info *info)
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{
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if (proc == NULL)
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return (size_t)-2;
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switch (info->type) {
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default:
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assert(info->type != info->type);
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abort();
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break;
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case ARGTYPE_CHAR:
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return 1;
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case ARGTYPE_SHORT:
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case ARGTYPE_USHORT:
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return 2;
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case ARGTYPE_INT:
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case ARGTYPE_UINT:
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return 4;
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case ARGTYPE_LONG:
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case ARGTYPE_ULONG:
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case ARGTYPE_POINTER:
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return proc->e_machine == EM_X86_64 ? 8 : 4;
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case ARGTYPE_FLOAT:
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return 4;
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case ARGTYPE_DOUBLE:
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return proc->e_machine == EM_X86_64 ? 8 : 4;
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case ARGTYPE_ARRAY:
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case ARGTYPE_STRUCT:
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/* Use default value. */
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return (size_t)-2;
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}
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}
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