1/*
2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#include <unistd.h>
7#include <signal.h>
8#include <errno.h>
9#include <asm/unistd.h>
10#include "sysdep/ptrace.h"
11#include "sigcontext.h"
12#include "ptrace_user.h"
13#include "task.h"
14#include "kern_util.h"
15#include "syscall.h"
16#include "tt.h"
17
18void do_sigtrap(void *task)
19{
20	UPT_SYSCALL_NR(TASK_REGS(task)) = -1;
21}
22
23void do_syscall(void *task, int pid, int local_using_sysemu)
24{
25	unsigned long proc_regs[FRAME_SIZE];
26
27	if(ptrace_getregs(pid, proc_regs) < 0)
28		tracer_panic("Couldn't read registers");
29
30	UPT_SYSCALL_NR(TASK_REGS(task)) = PT_SYSCALL_NR(proc_regs);
31
32#ifdef UPT_ORIGGPR2
33        UPT_ORIGGPR2(TASK_REGS(task)) = REGS_ORIGGPR2(proc_regs);
34#endif
35
36	if(((unsigned long *) PT_IP(proc_regs) >= &_stext) &&
37	   ((unsigned long *) PT_IP(proc_regs) <= &_etext))
38		tracer_panic("I'm tracing myself and I can't get out");
39
40	/* advanced sysemu mode set syscall number to -1 automatically */
41	if (local_using_sysemu==2)
42		return;
43
44	/* syscall number -1 in sysemu skips syscall restarting in host */
45	if(ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET,
46		  local_using_sysemu ? -1 : __NR_getpid) < 0)
47		tracer_panic("do_syscall : Nullifying syscall failed, "
48			     "errno = %d", errno);
49}
50
51/*
52 * Overrides for Emacs so that we follow Linus's tabbing style.
53 * Emacs will notice this stuff at the end of the file and automatically
54 * adjust the settings for this buffer only.  This must remain at the end
55 * of the file.
56 * ---------------------------------------------------------------------------
57 * Local variables:
58 * c-file-style: "linux"
59 * End:
60 */
61