1 /*
2 * This file is part of ltrace.
3 * Copyright (C) 2004,2008,2009 Juan Cespedes
4 * Copyright (C) 2006 Ian Wienand
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; either version 2 of the
9 * License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
19 * 02110-1301 USA
20 */
21
22 #include "config.h"
23
24 #include <stdlib.h>
25 #include <sys/types.h>
26 #include <sys/wait.h>
27 #include <signal.h>
28 #include <string.h>
29 #include "ptrace.h"
30 #include "proc.h"
31 #include "common.h"
32
33 void
get_arch_dep(struct process * proc)34 get_arch_dep(struct process *proc)
35 {
36 proc_archdep *a;
37 if (!proc->arch_ptr)
38 proc->arch_ptr = (void *)malloc(sizeof(proc_archdep));
39 a = (proc_archdep *) (proc->arch_ptr);
40 a->valid = (ptrace(PTRACE_GETREGS, proc->pid, &a->regs, 0) >= 0);
41 }
42
43 /* Returns syscall number if `pid' stopped because of a syscall.
44 * Returns -1 otherwise
45 */
46 int
syscall_p(struct process * proc,int status,int * sysnum)47 syscall_p(struct process *proc, int status, int *sysnum)
48 {
49 if (WIFSTOPPED(status)
50 && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
51 void *ip = get_instruction_pointer(proc);
52 unsigned int insn;
53 if (ip == (void *)-1)
54 return 0;
55 insn = ptrace(PTRACE_PEEKTEXT, proc->pid, ip, 0);
56 if ((insn & 0xc1f8007f) == 0x81d00010) {
57 *sysnum = ((proc_archdep *) proc->arch_ptr)->regs.u_regs[UREG_G0];
58 if (proc->callstack_depth > 0 &&
59 proc->callstack[proc->callstack_depth - 1].is_syscall &&
60 proc->callstack[proc->callstack_depth - 1].c_un.syscall == *sysnum) {
61 return 2;
62 } else if (*sysnum >= 0) {
63 return 1;
64 }
65 }
66 }
67 return 0;
68 }
69
70 long
gimme_arg(enum tof type,struct process * proc,int arg_num,struct arg_type_info * info)71 gimme_arg(enum tof type, struct process *proc, int arg_num,
72 struct arg_type_info *info)
73 {
74 proc_archdep *a = (proc_archdep *) proc->arch_ptr;
75 if (!a->valid) {
76 fprintf(stderr, "Could not get child registers\n");
77 exit(1);
78 }
79 if (arg_num == -1) /* return value */
80 return a->regs.u_regs[UREG_G7];
81
82 if (type == LT_TOF_FUNCTION || type == LT_TOF_SYSCALL || arg_num >= 6) {
83 if (arg_num < 6)
84 return ((int *)&a->regs.u_regs[UREG_G7])[arg_num];
85 return ptrace(PTRACE_PEEKTEXT, proc->pid,
86 proc->stack_pointer + 64 * (arg_num + 1));
87 } else if (type == LT_TOF_FUNCTIONR)
88 return a->func_arg[arg_num];
89 else if (type == LT_TOF_SYSCALLR)
90 return a->sysc_arg[arg_num];
91 else {
92 fprintf(stderr, "gimme_arg called with wrong arguments\n");
93 exit(1);
94 }
95 return 0;
96 }
97