From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 07/17] powerpc/40x: Refactor exception entry macros by using head_32.h
Date: Fri, 29 Mar 2019 16:38:29 +0000 (UTC) [thread overview]
Message-ID: <e048acf9c8bc517396a740172c6ce4c74204dc0d.1553877076.git.christophe.leroy@c-s.fr> (raw)
In-Reply-To: <cover.1553877076.git.christophe.leroy@c-s.fr>
Refactor exception entry macros by using the ones defined in head_32.h
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/head_32.h | 4 ++
arch/powerpc/kernel/head_40x.S | 88 +-----------------------------------------
2 files changed, 6 insertions(+), 86 deletions(-)
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 985758cbf577..aa0131bb09b5 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -59,8 +59,12 @@
stw r1,GPR1(r11)
stw r1,0(r11)
tovirt(r1,r11) /* set new kernel sp */
+#ifdef CONFIG_40x
+ rlwinm r9,r9,0,14,12 /* clear MSR_WE (necessary?) */
+#else
li r10,MSR_KERNEL & ~(MSR_IR|MSR_DR) /* can take exceptions */
MTMSRD(r10) /* (except for mach check in rtas) */
+#endif
stw r0,GPR0(r11)
lis r10,STACK_FRAME_REGS_MARKER@ha /* exception frame marker */
addi r10,r10,STACK_FRAME_REGS_MARKER@l
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 1547750567b6..cce9bd33a176 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -44,6 +44,8 @@
#include <asm/export.h>
#include <asm/asm-405.h>
+#include "head_32.h"
+
/* As with the other PowerPC ports, it is expected that when code
* execution begins here, the following registers contain valid, yet
* optional, information:
@@ -99,52 +101,6 @@ _ENTRY(saved_ksp_limit)
.space 4
/*
- * Exception vector entry code. This code runs with address translation
- * turned off (i.e. using physical addresses). We assume SPRG_THREAD has
- * the physical address of the current task thread_struct.
- */
-#define EXCEPTION_PROLOG \
- mtspr SPRN_SPRG_SCRATCH0,r10; /* save two registers to work with */\
- mtspr SPRN_SPRG_SCRATCH1,r11; \
- mfcr r10; /* save CR in r10 for now */\
- EXCEPTION_PROLOG_1; \
- EXCEPTION_PROLOG_2
-
-#define EXCEPTION_PROLOG_1 \
- mfspr r11,SPRN_SRR1; /* check whether user or kernel */\
- andi. r11,r11,MSR_PR; \
- tophys(r11,r1); \
- beq 1f; \
- mfspr r11,SPRN_SPRG_THREAD; /* if from user, start at top of */\
- lwz r11,TASK_STACK-THREAD(r11); /* this thread's kernel stack */\
- addi r11,r11,THREAD_SIZE; \
- tophys(r11,r11); \
-1: subi r11,r11,INT_FRAME_SIZE /* Allocate an exception frame */
-
-#define EXCEPTION_PROLOG_2 \
- stw r10,_CCR(r11); /* save various registers */\
- stw r12,GPR12(r11); \
- stw r9,GPR9(r11); \
- mfspr r10,SPRN_SPRG_SCRATCH0; \
- stw r10,GPR10(r11); \
- mfspr r12,SPRN_SPRG_SCRATCH1; \
- stw r12,GPR11(r11); \
- mflr r10; \
- stw r10,_LINK(r11); \
- mfspr r12,SPRN_SRR0; \
- stw r1,GPR1(r11); \
- mfspr r9,SPRN_SRR1; \
- stw r1,0(r11); \
- tovirt(r1,r11); /* set new kernel sp */ \
- rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
- stw r0,GPR0(r11); \
- lis r10, STACK_FRAME_REGS_MARKER@ha; /* exception frame marker */\
- addi r10, r10, STACK_FRAME_REGS_MARKER@l; \
- stw r10, 8(r11); \
- SAVE_4GPRS(3, r11); \
- SAVE_2GPRS(7, r11)
-
-/*
* Exception prolog for critical exceptions. This is a little different
* from the normal exception prolog above since a critical exception
* can potentially occur at any point during normal exception processing.
@@ -205,16 +161,6 @@ _ENTRY(saved_ksp_limit)
/*
* Exception vectors.
*/
-#define START_EXCEPTION(n, label) \
- . = n; \
-label:
-
-#define EXCEPTION(n, label, hdlr, xfer) \
- START_EXCEPTION(n, label); \
- EXCEPTION_PROLOG; \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
- xfer(n, hdlr)
-
#define CRITICAL_EXCEPTION(n, label, hdlr) \
START_EXCEPTION(n, label); \
CRITICAL_EXCEPTION_PROLOG; \
@@ -223,36 +169,6 @@ label:
NOCOPY, crit_transfer_to_handler, \
ret_from_crit_exc)
-#define EXC_XFER_TEMPLATE(hdlr, trap, msr, copyee, tfer, ret) \
- li r10,trap; \
- stw r10,_TRAP(r11); \
- lis r10,msr@h; \
- ori r10,r10,msr@l; \
- copyee(r10, r9); \
- bl tfer; \
- .long hdlr; \
- .long ret
-
-#define COPY_EE(d, s) rlwimi d,s,0,16,16
-#define NOCOPY(d, s)
-
-#define EXC_XFER_STD(n, hdlr) \
- EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, NOCOPY, transfer_to_handler_full, \
- ret_from_except_full)
-
-#define EXC_XFER_LITE(n, hdlr) \
- EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, NOCOPY, transfer_to_handler, \
- ret_from_except)
-
-#define EXC_XFER_EE(n, hdlr) \
- EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, COPY_EE, transfer_to_handler_full, \
- ret_from_except_full)
-
-#define EXC_XFER_EE_LITE(n, hdlr) \
- EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, COPY_EE, transfer_to_handler, \
- ret_from_except)
-
-
/*
* 0x0100 - Critical Interrupt Exception
*/
--
2.13.3
next prev parent reply other threads:[~2019-03-29 16:54 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-29 16:38 [PATCH v2 00/17] powerpc/32: Implement fast syscall entry Christophe Leroy
2019-03-29 16:38 ` [PATCH v2 01/17] powerpc/32: Refactor EXCEPTION entry macros for head_8xx.S and head_32.S Christophe Leroy
2019-03-29 16:38 ` [PATCH v2 02/17] powerpc/32: move LOAD_MSR_KERNEL() into head_32.h and use it Christophe Leroy
2019-03-29 16:38 ` [PATCH v2 03/17] powerpc/32: make the 6xx/8xx EXC_XFER_TEMPLATE() similar to the 40x/booke one Christophe Leroy
2019-03-29 16:38 ` [PATCH v2 04/17] powerpc/40x: Don't use SPRN_SPRG_SCRATCH2 in EXCEPTION_PROLOG Christophe Leroy
2019-03-29 16:38 ` [PATCH v2 05/17] powerpc/40x: add exception frame marker Christophe Leroy
2019-03-29 16:38 ` [PATCH v2 06/17] powerpc/40x: Split and rename NORMAL_EXCEPTION_PROLOG Christophe Leroy
2019-03-29 16:38 ` Christophe Leroy [this message]
2019-03-29 16:38 ` [PATCH v2 08/17] powerpc/fsl_booke: ensure SPEFloatingPointException() reenables interrupts Christophe Leroy
2019-03-29 16:38 ` [PATCH v2 09/17] powerpc/32: enter syscall with MSR_EE inconditionaly set Christophe Leroy
2019-03-29 16:38 ` [PATCH v2 10/17] powerpc/32: Enter exceptions with MSR_EE unset Christophe Leroy
2019-03-29 16:38 ` [PATCH v2 11/17] powerpc/32: get rid of COPY_EE in exception entry Christophe Leroy
2019-03-29 16:38 ` [PATCH v2 12/17] powerpc: Fix 32-bit handling of MSR_EE on exceptions Christophe Leroy
2019-03-29 16:38 ` [PATCH v2 13/17] powerpc/32: implement fast entry for syscalls on non BOOKE Christophe Leroy
2019-03-29 16:38 ` [PATCH v2 14/17] powerpc/32: implement fast entry for syscalls on BOOKE Christophe Leroy
2019-03-29 16:38 ` [PATCH v2 15/17] powerpc/32: Remove MSR_PR test when returning from syscall Christophe Leroy
2019-03-29 16:38 ` [PATCH v2 16/17] powerpc/32: don't do syscall stuff in transfer_to_handler Christophe Leroy
2019-03-29 16:38 ` [PATCH v2 17/17] powerpc/32: Don't add dummy frames when calling trace_hardirqs_on/off Christophe Leroy
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