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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
This commit is contained in:
Christophe Leroy 2019-12-21 08:32:32 +00:00 committed by Michael Ellerman
parent 6edc318585
commit 9260f76ae2
1 changed files with 0 additions and 29 deletions
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29
arch/powerpc/kernel/head_8xx.S
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@ -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)
@ -162,16 +150,9 @@ 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:
@ -179,8 +160,6 @@ SystemCall:
/* 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.