96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
/*
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* This file is part of ltrace.
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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 <stdlib.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <string.h>
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#include "ptrace.h"
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#include "proc.h"
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#include "common.h"
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void
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get_arch_dep(struct process *proc)
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{
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proc_archdep *a;
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if (!proc->arch_ptr)
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proc->arch_ptr = (void *)malloc(sizeof(proc_archdep));
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a = (proc_archdep *) (proc->arch_ptr);
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a->valid = (ptrace(PTRACE_GETREGS, proc->pid, &a->regs, 0) >= 0);
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}
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/* Returns syscall number if `pid' stopped because of a syscall.
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* Returns -1 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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void *ip = get_instruction_pointer(proc);
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unsigned int insn;
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if (ip == (void *)-1)
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return 0;
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insn = ptrace(PTRACE_PEEKTEXT, proc->pid, ip, 0);
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if ((insn & 0xc1f8007f) == 0x81d00010) {
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*sysnum = ((proc_archdep *) proc->arch_ptr)->regs.u_regs[UREG_G0];
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if (proc->callstack_depth > 0 &&
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proc->callstack[proc->callstack_depth - 1].is_syscall &&
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proc->callstack[proc->callstack_depth - 1].c_un.syscall == *sysnum) {
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return 2;
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} else if (*sysnum >= 0) {
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return 1;
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}
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}
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}
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return 0;
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}
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long
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gimme_arg(enum tof type, struct process *proc, int arg_num,
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struct arg_type_info *info)
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{
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proc_archdep *a = (proc_archdep *) proc->arch_ptr;
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if (!a->valid) {
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fprintf(stderr, "Could not get child registers\n");
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exit(1);
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}
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if (arg_num == -1) /* return value */
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return a->regs.u_regs[UREG_G7];
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if (type == LT_TOF_FUNCTION || type == LT_TOF_SYSCALL || arg_num >= 6) {
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if (arg_num < 6)
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return ((int *)&a->regs.u_regs[UREG_G7])[arg_num];
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return ptrace(PTRACE_PEEKTEXT, proc->pid,
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proc->stack_pointer + 64 * (arg_num + 1));
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} else if (type == LT_TOF_FUNCTIONR)
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return a->func_arg[arg_num];
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else if (type == LT_TOF_SYSCALLR)
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return a->sysc_arg[arg_num];
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else {
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fprintf(stderr, "gimme_arg called with wrong arguments\n");
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exit(1);
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}
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return 0;
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}
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