Skip to content
  • Paul Brook's avatar
    [ARM] 3335/1: Old-abi Thumb sys_syscall broken · 5247593c
    Paul Brook authored
    
    
    Patch from Paul Brook
    
    The old-abi sys_syscall syscall is broken when called from Thumb mode. It
    assumes the syscall number is an Arm syscall number (ie. starts from
    __NR_OABI_SYSCALL_BASE).  In thumb mode syscall numbers start from zero.
    
    The patch below fixes this by clearing the nigh bits of the syscall number
    instead of inverting them. Technically this means we accept some invalid
    syscall numbers, but I can't see how that could be a problem. The two sets of
    numbers far apart that unimplemented syscalls should still be rejected.
    
    Signed-off-by: default avatarPaul Brook <paul@codesourcery.com>
    Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
    5247593c