vserver 1.9.5.x5

[linux-2.6.git] / arch / um / kernel / tt / syscall_user.c

diff --git a/arch/um/kernel/tt/syscall_user.c b/arch/um/kernel/tt/syscall_user.c
index 1cabbd8..32fbe32 100644 (file)
--- a/arch/um/kernel/tt/syscall_user.c
+++ b/arch/um/kernel/tt/syscall_user.c
@@ -17,10 +17,6 @@
 #include "syscall_user.h"
 #include "tt.h"
 
-/* XXX Bogus */
-#define ERESTARTSYS    512
-#define ERESTARTNOINTR 513
-#define ERESTARTNOHAND 514
 
 void syscall_handler_tt(int sig, union uml_pt_regs *regs)
 {
@@ -33,7 +29,7 @@ void syscall_handler_tt(int sig, union uml_pt_regs *regs)
        SC_START_SYSCALL(sc);
 
        index = record_syscall_start(syscall);
-       syscall_trace(regs, 1);
+       syscall_trace(regs, 0);
        result = execute_syscall(regs);
 
        /* regs->sc may have changed while the system call ran (there may
@@ -42,39 +38,38 @@ void syscall_handler_tt(int sig, union uml_pt_regs *regs)
        UPT_SC(regs) = sc;
 
        SC_SET_SYSCALL_RETURN(sc, result);
-       if((result == -ERESTARTNOHAND) || (result == -ERESTARTSYS) || 
-          (result == -ERESTARTNOINTR))
-               do_signal(result);
 
-       syscall_trace(regs, 0);
+       syscall_trace(regs, 1);
        record_syscall_end(index, result);
 }
 
-int do_syscall(void *task, int pid)
+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];
-       union uml_pt_regs *regs;
-       int syscall;
 
        if(ptrace_getregs(pid, proc_regs) < 0)
                tracer_panic("Couldn't read registers");
-       syscall = PT_SYSCALL_NR(proc_regs);
 
-       regs = TASK_REGS(task);
-       UPT_SYSCALL_NR(regs) = syscall;
+       UPT_SYSCALL_NR(TASK_REGS(task)) = PT_SYSCALL_NR(proc_regs);
 
-       if(syscall < 1) return(0);
-
-       if((syscall != __NR_sigreturn) &&
-          ((unsigned long *) PT_IP(proc_regs) >= &_stext) && 
+       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_POKEUSER, pid, PT_SYSCALL_NR_OFFSET, 
-                 __NR_getpid) < 0)
+                 local_using_sysemu ? -1 : __NR_getpid) < 0)
                tracer_panic("do_syscall : Nullifying syscall failed, "
                             "errno = %d", errno);
-       return(1);
 }
 
 /*