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Tue, 26 Nov 2019 13:36:14 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id b0QeyJu1o0UF; Tue, 26 Nov 2019 13:36:14 +0100 (CET) Received: from po16098vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 197AE8B771; Tue, 26 Nov 2019 13:36:14 +0100 (CET) Received: by po16098vm.idsi0.si.c-s.fr (Postfix, from userid 0) id D9EED6B76A; Tue, 26 Nov 2019 12:36:13 +0000 (UTC) Message-Id: <53512a73668924639e88b3bf1cef8d5b115aa9ca.1574771541.git.christophe.leroy@c-s.fr> In-Reply-To: References: From: Christophe Leroy Subject: [PATCH v4 10/16] powerpc/8xx: drop exception entries for non-existing exceptions To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org Date: Tue, 26 Nov 2019 12:36:13 +0000 (UTC) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 --- arch/powerpc/kernel/head_8xx.S | 29 ----------------------------- 1 file changed, 29 deletions(-) diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index 3de9c5f1746c..5aa63693f790 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/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) @@ -162,16 +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.