diff options
Diffstat (limited to 'arch/arm/kernel/entry-common.S')
| -rw-r--r-- | arch/arm/kernel/entry-common.S | 38 |
1 files changed, 33 insertions, 5 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S index 978eac57e04..e340fa1db20 100644 --- a/arch/arm/kernel/entry-common.S +++ b/arch/arm/kernel/entry-common.S @@ -91,9 +91,42 @@ ENTRY(ret_from_fork) b ret_slow_syscall ENDPROC(ret_from_fork) +ENTRY(ret_from_kernel_thread) + UNWIND(.fnstart) + UNWIND(.cantunwind) + bl schedule_tail + mov r0, r4 + adr lr, BSYM(1f) @ kernel threads should not exit + mov pc, r5 +1: bl do_exit + nop + UNWIND(.fnend) +ENDPROC(ret_from_kernel_thread) + +/* + * turn a kernel thread into userland process + * use: ret_from_kernel_execve(struct pt_regs *normal) + */ +ENTRY(ret_from_kernel_execve) + mov why, #0 @ not a syscall + str why, [r0, #S_R0] @ ... and we want 0 in ->ARM_r0 as well + get_thread_info tsk @ thread structure + mov sp, r0 @ stack pointer just under pt_regs + b ret_slow_syscall +ENDPROC(ret_from_kernel_execve) + .equ NR_syscalls,0 #define CALL(x) .equ NR_syscalls,NR_syscalls+1 #include "calls.S" + +/* + * Ensure that the system call table is equal to __NR_syscalls, + * which is the value the rest of the system sees + */ +.ifne NR_syscalls - __NR_syscalls +.error "__NR_syscalls is not equal to the size of the syscall table" +.endif + #undef CALL #define CALL(x) .long x @@ -508,11 +541,6 @@ sys_vfork_wrapper: b sys_vfork ENDPROC(sys_vfork_wrapper) -sys_execve_wrapper: - add r3, sp, #S_OFF - b sys_execve -ENDPROC(sys_execve_wrapper) - sys_clone_wrapper: add ip, sp, #S_OFF str ip, [sp, #4] |