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sh: Exception vector rework and SH-2/SH-2A support.

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This splits out common bits from the existing exception handler for
use between SH-2/SH-2A and SH-3/4, and adds support for the SH-2/2A
exceptions.

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Yoshinori Sato
2006-11-05 16:15:19 +09:00
committed by Paul Mundt
parent 0983b31849
commit de39840646
7 changed files with 767 additions and 332 deletions
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12
arch/sh/kernel/head.S
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@@ -53,8 +53,10 @@ ENTRY(_stext)
ldc r0, sr
! Initialize global interrupt mask
mov #0, r0
#ifdef CONFIG_CPU_HAS_SR_RB
ldc r0, r6_bank
#endif
/*
* Prefetch if possible to reduce cache miss penalty.
*
@@ -71,8 +73,10 @@ ENTRY(_stext)
mov #(THREAD_SIZE >> 8), r1
shll8 r1 ! r1 = THREAD_SIZE
sub r1, r0 !
#ifdef CONFIG_CPU_HAS_SR_RB
ldc r0, r7_bank ! ... and initial thread_info
#endif
! Clear BSS area
mov.l 3f, r1
add #4, r1
@@ -95,7 +99,11 @@ ENTRY(_stext)
nop
.balign 4
#if defined(CONFIG_CPU_SH2)
1: .long 0x000000F0 ! IMASK=0xF
#else
1: .long 0x400080F0 ! MD=1, RB=0, BL=0, FD=1, IMASK=0xF
#endif
2: .long init_thread_union+THREAD_SIZE
3: .long __bss_start
4: .long _end