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powerpc/40x: Refactor exception entry macros by using head_32.h

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Refactor exception entry macros by using the ones defined in head_32.h

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2019-04-30 12:38:56 +00:00 committed by Michael Ellerman
parent 7271fc9604
commit 90f204b9a1
2 changed files with 6 additions and 86 deletions
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4
arch/powerpc/kernel/head_32.h
View File

@ -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

88
arch/powerpc/kernel/head_40x.S
View File

@ -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:
@ -98,52 +100,6 @@ _ENTRY(crit_srr1)
_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
@ -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
*/