um: Store syscall number after syscall_trace_enter()

To support changing syscall numbers we have to store
it after syscall_trace_enter().

Signed-off-by: Richard Weinberger <richard@nod.at>

1 files changed, 3 insertions, 10 deletions

diff --git a/arch/um/kernel/skas/syscall.c b/arch/um/kernel/skas/syscall.c
index d9ec0068b623..64a8fe589d6f 100644
--- a/arch/um/kernel/skas/syscall.c
+++ b/arch/um/kernel/skas/syscall.c
@@ -8,6 +8,7 @@
 #include <kern_util.h>
 #include <sysdep/ptrace.h>
 #include <sysdep/syscalls.h>
+#include <os.h>
 
 extern int syscall_table_size;
 #define NR_SYSCALLS (syscall_table_size / sizeof(void *))
@@ -23,16 +24,8 @@ void handle_syscall(struct uml_pt_regs *r)
                 goto out;
         }
 
-        /*
-         * This should go in the declaration of syscall, but when I do that,
-         * strace -f -c bash -c 'ls ; ls' breaks, sometimes not tracing
-         * children at all, sometimes hanging when bash doesn't see the first
-         * ls exit.
-         * The assembly looks functionally the same to me.  This is
-         *     gcc version 4.0.1 20050727 (Red Hat 4.0.1-5)
-         * in case it's a compiler bug.
-         */
-        syscall = UPT_SYSCALL_NR(r);
+        syscall = get_syscall(r);
+
         if ((syscall >= NR_SYSCALLS) || (syscall < 0))
                 result = -ENOSYS;
         else result = EXECUTE_SYSCALL(syscall, regs);