trace.c revision 3219f320604810532a4938dda8f9dfadb0e840f3 
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
11#include "ltrace.h"
12
13#if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
14# define PTRACE_PEEKUSER PTRACE_PEEKUSR
15#endif
16
17#if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR))
18# define PTRACE_POKEUSER PTRACE_POKEUSR
19#endif
20
21void get_arch_dep(struct process *proc)
22{
23}
24
25/* Returns 1 if syscall, 2 if sysret, 0 otherwise.
26 */
27#define SYSCALL_INSN   0x44000002
28int syscall_p(struct process *proc, int status, int *sysnum)
29{
30	if (WIFSTOPPED(status) && WSTOPSIG(status) == SIGTRAP) {
31		int pc = ptrace(PTRACE_PEEKUSER, proc->pid, 4 * PT_NIP, 0);
32		int insn = ptrace(PTRACE_PEEKTEXT, proc->pid, pc - 4, 0);
33
34		if (insn == SYSCALL_INSN) {
35			*sysnum =
36			    ptrace(PTRACE_PEEKUSER, proc->pid, 4 * PT_R0, 0);
37			if (proc->callstack_depth > 0
38			    && proc->callstack[proc->callstack_depth -
39					       1].is_syscall) {
40				return 2;
41			}
42			return 1;
43		}
44	}
45	return 0;
46}
47
48long gimme_arg(enum tof type, struct process *proc, int arg_num)
49{
50	if (arg_num == -1) {	/* return value */
51		return ptrace(PTRACE_PEEKUSER, proc->pid, 4 * PT_R3, 0);
52	} else if (arg_num < 8) {
53		return ptrace(PTRACE_PEEKUSER, proc->pid, 4 * (arg_num + PT_R3),
54			      0);
55	} else {
56		return ptrace(PTRACE_PEEKDATA, proc->pid,
57			      proc->stack_pointer + 8 * (arg_num - 8), 0);
58	}
59	return 0;
60}
61
62void save_register_args(enum tof type, struct process *proc)
63{
64}
65