The patch titled
i386: early pagefault handler
has been added to the -mm tree. Its filename is
i386-early-pagefault-handler.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: i386: early pagefault handler
From: Chuck Ebbert <76306.1226@xxxxxxxxxxxxxx>
Page faults during kernel initialization can be hard to diagnose.
Add a handler that prints the fault address, EIP and top of stack
when an early page fault happens.
Signed-off-by: Chuck Ebbert <76306.1226@xxxxxxxxxxxxxx>
Acked-by: Ingo Molnar <mingo@xxxxxxx>
Cc: Andi Kleen <ak@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/kernel/head.S | 37 +++++++++++++++++++++++++++++++++++++
1 files changed, 37 insertions(+)
diff -puN arch/i386/kernel/head.S~i386-early-pagefault-handler arch/i386/kernel/head.S
--- a/arch/i386/kernel/head.S~i386-early-pagefault-handler
+++ a/arch/i386/kernel/head.S
@@ -377,8 +377,41 @@ rp_sidt:
addl $8,%edi
dec %ecx
jne rp_sidt
+
+ lea page_fault,%edi /* early page fault handler */
+ movw %di,%ax
+ andl $0x0000ffff,%edx
+ andl $0xffff0000,%edi
+ orl %edi,%edx
+ lea idt_table,%edi
+ movl %eax,8*14(%edi)
+ movl %edx,8*14+4(%edi)
+
ret
+/* This is the early page fault handler */
+ ALIGN
+page_fault:
+ cld
+#ifdef CONFIG_PRINTK
+ movl $(__KERNEL_DS),%eax
+ movl %eax,%ds
+ movl %eax,%es
+ movl %cr2,%eax
+ pushl %eax
+ pushl $pf_msg
+#ifdef CONFIG_EARLY_PRINTK
+ call early_printk
+#else
+ call printk
+#endif
+#endif
+hlt_loop:
+ hlt
+1:
+ rep ; nop
+ jmp 1b
+
/* This is the default interrupt "handler" :-) */
ALIGN
ignore_int:
@@ -440,6 +473,10 @@ ready: .byte 0
int_msg:
.asciz "Unknown interrupt or fault at EIP %p %p %p\n"
+pf_msg:
+ .ascii "Pg flt: CR2 %p err %p EIP %p CS %p flags %p\n"
+ .asciz " Stk: %p %p %p %p %p %p %p %p\n"
+
/*
* The IDT and GDT 'descriptors' are a strange 48-bit object
* only used by the lidt and lgdt instructions. They are not
_
Patches currently in -mm which might be from 76306.1226@xxxxxxxxxxxxxx are
origin.patch
i386-print-stack-size-in-oops-messages.patch
sleazy-fpu-feature-i386-support.patch
i386-early-pagefault-handler.patch
-
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