2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
9 #include <sys/ptrace.h>
10 #include <asm/unistd.h>
11 #include "sysdep/ptrace.h"
12 #include "sigcontext.h"
13 #include "ptrace_user.h"
15 #include "user_util.h"
16 #include "kern_util.h"
17 #include "syscall_user.h"
21 #define ERESTARTSYS 512
22 #define ERESTARTNOINTR 513
23 #define ERESTARTNOHAND 514
25 void syscall_handler_tt(int sig, union uml_pt_regs *regs)
31 syscall = UPT_SYSCALL_NR(regs);
35 index = record_syscall_start(syscall);
36 syscall_trace(regs, 1);
37 result = execute_syscall(regs);
39 /* regs->sc may have changed while the system call ran (there may
40 * have been an interrupt or segfault), so it needs to be refreshed.
44 SC_SET_SYSCALL_RETURN(sc, result);
45 if((result == -ERESTARTNOHAND) || (result == -ERESTARTSYS) ||
46 (result == -ERESTARTNOINTR))
49 syscall_trace(regs, 0);
50 record_syscall_end(index, result);
53 int do_syscall(void *task, int pid)
55 unsigned long proc_regs[FRAME_SIZE];
56 union uml_pt_regs *regs;
59 if(ptrace_getregs(pid, proc_regs) < 0)
60 tracer_panic("Couldn't read registers");
61 syscall = PT_SYSCALL_NR(proc_regs);
63 regs = TASK_REGS(task);
64 UPT_SYSCALL_NR(regs) = syscall;
66 if(syscall < 1) return(0);
68 if((syscall != __NR_sigreturn) &&
69 ((unsigned long *) PT_IP(proc_regs) >= &_stext) &&
70 ((unsigned long *) PT_IP(proc_regs) <= &_etext))
71 tracer_panic("I'm tracing myself and I can't get out");
73 if(ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_NR_OFFSET,
75 tracer_panic("do_syscall : Nullifying syscall failed, "
81 * Overrides for Emacs so that we follow Linus's tabbing style.
82 * Emacs will notice this stuff at the end of the file and automatically
83 * adjust the settings for this buffer only. This must remain at the end
85 * ---------------------------------------------------------------------------
87 * c-file-style: "linux"