1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <asm/unistd.h>
#include "sysdep/ptrace.h"
#include "sigcontext.h"
#include "ptrace_user.h"
#include "task.h"
#include "user_util.h"
#include "kern_util.h"
#include "syscall_user.h"
#include "tt.h"
void syscall_handler_tt(int sig, union uml_pt_regs *regs)
{
void *sc;
long result;
int syscall;
#ifdef UML_CONFIG_DEBUG_SYSCALL
int index;
#endif
syscall = UPT_SYSCALL_NR(regs);
sc = UPT_SC(regs);
SC_START_SYSCALL(sc);
#ifdef UML_CONFIG_DEBUG_SYSCALL
index = record_syscall_start(syscall);
#endif
syscall_trace(regs, 0);
result = execute_syscall_tt(regs);
/* regs->sc may have changed while the system call ran (there may
* have been an interrupt or segfault), so it needs to be refreshed.
*/
UPT_SC(regs) = sc;
SC_SET_SYSCALL_RETURN(sc, result);
syscall_trace(regs, 1);
#ifdef UML_CONFIG_DEBUG_SYSCALL
record_syscall_end(index, result);
#endif
}
void do_sigtrap(void *task)
{
UPT_SYSCALL_NR(TASK_REGS(task)) = -1;
}
void do_syscall(void *task, int pid, int local_using_sysemu)
{
unsigned long proc_regs[FRAME_SIZE];
if(ptrace_getregs(pid, proc_regs) < 0)
tracer_panic("Couldn't read registers");
UPT_SYSCALL_NR(TASK_REGS(task)) = PT_SYSCALL_NR(proc_regs);
if(((unsigned long *) PT_IP(proc_regs) >= &_stext) &&
((unsigned long *) PT_IP(proc_regs) <= &_etext))
tracer_panic("I'm tracing myself and I can't get out");
/* advanced sysemu mode set syscall number to -1 automatically */
if (local_using_sysemu==2)
return;
/* syscall number -1 in sysemu skips syscall restarting in host */
if(ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET,
local_using_sysemu ? -1 : __NR_getpid) < 0)
tracer_panic("do_syscall : Nullifying syscall failed, "
"errno = %d", errno);
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/
|
