trace.c revision b1dda4bc2c78429823a5ca7699f3207a7aea2371 
1#if HAVE_CONFIG_H
2#include "config.h"
3#endif
4
5#include <sys/types.h>
6#include <sys/wait.h>
7#include <signal.h>
8#include <sys/ptrace.h>
9#include <asm/ptrace.h>
10#include <elf.h>
11
12#include "common.h"
13
14#if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
15# define PTRACE_PEEKUSER PTRACE_PEEKUSR
16#endif
17
18#if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR))
19# define PTRACE_POKEUSER PTRACE_POKEUSR
20#endif
21
22void get_arch_dep(Process *proc)
23{
24}
25
26/* Returns 1 if syscall, 2 if sysret, 0 otherwise.
27 */
28#define SYSCALL_INSN   0xe93d
29int syscall_p(Process *proc, int status, int *sysnum)
30{
31	if (WIFSTOPPED(status)
32	    && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
33		long pc = (long)get_instruction_pointer(proc);
34		unsigned int insn =
35		    (int)ptrace(PTRACE_PEEKTEXT, proc->pid, pc - sizeof(long),
36				0);
37
38		if ((insn >> 16) == SYSCALL_INSN) {
39			*sysnum =
40			    (int)ptrace(PTRACE_PEEKUSER, proc->pid,
41					sizeof(long) * PT_R9, 0);
42			if (proc->callstack_depth > 0
43			    && proc->callstack[proc->callstack_depth -
44					       1].is_syscall) {
45				return 2;
46			}
47			return 1;
48		}
49	}
50	return 0;
51}
52
53long gimme_arg(enum tof type, Process *proc, int arg_num, arg_type_info *info)
54{
55	int pid = proc->pid;
56
57	if (arg_num == -1) {	/* return value */
58		return ptrace(PTRACE_PEEKUSER, pid, PT_R10 * 4, 0);
59	} else if (arg_num < 6) {
60		int pt_arg[6] =
61			{
62				PT_ORIG_R10, PT_R11, PT_R12, PT_R13, PT_MOF,
63				PT_SRP
64			};
65		return ptrace(PTRACE_PEEKUSER, pid, pt_arg[arg_num] * 4, 0);
66	} else {
67		return ptrace(PTRACE_PEEKDATA, pid,
68			      proc->stack_pointer + 4 * (arg_num - 6), 0);
69	}
70	return 0;
71}
72
73void save_register_args(enum tof type, Process *proc)
74{
75}
76