If I am reading 2.2.3-rmk2 right, the alignment trap handler disables
alignment traps if one occurs in user mode and alignment traps are
enabled on every entry to the kernel except via SWIs. This would make
the alignment trap handler unreliable.
This patch fixes that :
--- linux/arch/arm/kernel/entry-armv.S.old Wed Apr 7 09:14:40 1999
+++ linux/arch/arm/kernel/entry-armv.S Wed Apr 7 09:18:39 1999
@@ -505,6 +505,9 @@
.LCabt: .word __temp_abt
.LCprocfns: .word SYMBOL_NAME(processor)
.LCfp: .word SYMBOL_NAME(fp_enter)
+#ifdef CONFIG_ALIGNMENT_TRAP
+.LCswi: .word SYMBOL_NAME(cr_alignment)
+#endif
irq_prio_table
--- linux/arch/arm/kernel/entry-common.S.old Wed Apr 7 08:47:48 1999
+++ linux/arch/arm/kernel/entry-common.S Wed Apr 7 09:18:33 1999
@@ -64,8 +64,13 @@
vector_swi: save_user_regs
mask_pc lr, lr
mov fp, #0
- ldr r6, [lr, #-4] @ get SWI instruction
- arm700_bug_check r6, r7
+#ifdef CONFIG_ALIGNMENT_TRAP
+ ldr r7, .LCswi
+ ldr r7, [r7]
+ mcr p15, 0, r7, c1, c0
+#endif
+ ldr r6, [lr, #-4] @ get SWI instruction
+ arm700_bug_check r6, r7
enable_irqs r7
str r4, [sp, #-4]! @ new style: (r0 = arg1, r4 = arg5)
I may have broken some optimisations.
--
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