1 files changed, 90 insertions, 0 deletions
diff --git a/arch/um/kernel/tt/syscall_user.c b/arch/um/kernel/tt/syscall_user.c
new file mode 100644
index 00000000000..e4e7e9c2224
--- /dev/null
+++ b/arch/um/kernel/tt/syscall_user.c
@@ -0,0 +1,90 @@
+/* 
+ * 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:
+ */