powerpc/8xx: Drop exception entries for non-existing exceptions

head_8xx.S has entries for all exceptions from 0x100 to 0x1f00.
Several of them do not exist and are never generated by the 8xx
in accordance with the documentation.

Remove those entry points to make some room for future growing
exception code.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/66f92866fe9524cf0f056016921c7d53adaef3a0.1576916812.git.christophe.leroy@c-s.fr

arch/powerpc/kernel/head_8xx.S

@@ -134,18 +134,6 @@ MachineCheck:
 	addi r3,r1,STACK_FRAME_OVERHEAD
 	EXC_XFER_STD(0x200, machine_check_exception)
 
-/* Data access exception.
- * This is "never generated" by the MPC8xx.
- */
-	. = 0x300
-DataAccess:
-
-/* Instruction access exception.
- * This is "never generated" by the MPC8xx.
- */
-	. = 0x400
-InstructionAccess:
-
 /* External interrupt */
 	EXCEPTION(0x500, HardwareInterrupt, do_IRQ, EXC_XFER_LITE)
 
@@ -162,25 +150,16 @@ Alignment:
 /* Program check exception */
 	EXCEPTION(0x700, ProgramCheck, program_check_exception, EXC_XFER_STD)
 
-/* No FPU on MPC8xx.  This exception is not supposed to happen.
-*/
-	EXCEPTION(0x800, FPUnavailable, unknown_exception, EXC_XFER_STD)
-
 /* Decrementer */
 	EXCEPTION(0x900, Decrementer, timer_interrupt, EXC_XFER_LITE)
 
-	EXCEPTION(0xa00, Trap_0a, unknown_exception, EXC_XFER_STD)
-	EXCEPTION(0xb00, Trap_0b, unknown_exception, EXC_XFER_STD)
-
 /* System call */
 	. = 0xc00
 SystemCall:
 	SYSCALL_ENTRY	0xc00
 
 /* Single step - not used on 601 */
 	EXCEPTION(0xd00, SingleStep, single_step_exception, EXC_XFER_STD)
-	EXCEPTION(0xe00, Trap_0e, unknown_exception, EXC_XFER_STD)
-	EXCEPTION(0xf00, Trap_0f, unknown_exception, EXC_XFER_STD)
 
 /* On the MPC8xx, this is a software emulation interrupt.  It occurs
  * for all unimplemented and illegal instructions.
@@ -507,14 +486,6 @@ DARFixed:/* Return from dcbx instruction bug workaround */
 	/* 0x300 is DataAccess exception, needed by bad_page_fault() */
 	EXC_XFER_LITE(0x300, handle_page_fault)
 
-	EXCEPTION(0x1500, Trap_15, unknown_exception, EXC_XFER_STD)
-	EXCEPTION(0x1600, Trap_16, unknown_exception, EXC_XFER_STD)
-	EXCEPTION(0x1700, Trap_17, unknown_exception, EXC_XFER_STD)
-	EXCEPTION(0x1800, Trap_18, unknown_exception, EXC_XFER_STD)
-	EXCEPTION(0x1900, Trap_19, unknown_exception, EXC_XFER_STD)
-	EXCEPTION(0x1a00, Trap_1a, unknown_exception, EXC_XFER_STD)
-	EXCEPTION(0x1b00, Trap_1b, unknown_exception, EXC_XFER_STD)
-
 /* On the MPC8xx, these next four traps are used for development
  * support of breakpoints and such.  Someday I will get around to
  * using them.