x86/entry/32: Remove the 0/-1 distinction from exception entries

Nothing cares about the -1 "mark as interrupt" in the errorcode of
exception entries. It's only used to fill the error code when a signal is
delivered, but this is already inconsistent vs. 64 bit as there all
exceptions which do not have an error code set it to 0. So if 32 bit
applications would care about this, then they would have noticed more than
a decade ago.

Just use 0 for all excpetions which do not have an errorcode consistently.

This does neither break /proc/$PID/syscall because this interface examines
the error code / syscall number which is on the stack and that is set to -1
(no syscall) in common_exception unconditionally for all exceptions. The
push in the entry stub is just there to fill the hardware error code slot
on the stack for consistency of the stack layout.

A transient observation of 0 is possible, but that's true for the other
exceptions which use 0 already as well and that interface is an unreliable
snapshot of dubious correctness anyway.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Link: https://lkml.kernel.org/r/87mu94m7ky.fsf@nanos.tec.linutronix.de

diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 0753f48..ddc87f2 100644 (file)
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1290,7 +1290,7 @@ SYM_CODE_END(simd_coprocessor_error)
 
 SYM_CODE_START(device_not_available)
        ASM_CLAC
-       pushl   $-1                             # mark this as an int
+       pushl   $0
        pushl   $do_device_not_available
        jmp     common_exception
 SYM_CODE_END(device_not_available)
@@ -1531,7 +1531,7 @@ SYM_CODE_START(debug)
         * Entry from sysenter is now handled in common_exception
         */
        ASM_CLAC
-       pushl   $-1                             # mark this as an int
+       pushl   $0
        pushl   $do_debug
        jmp     common_exception
 SYM_CODE_END(debug)
@@ -1682,7 +1682,7 @@ SYM_CODE_END(nmi)
 
 SYM_CODE_START(int3)
        ASM_CLAC
-       pushl   $-1                             # mark this as an int
+       pushl   $0
        pushl   $do_int3
        jmp     common_exception
 SYM_CODE_END(int3)