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SubjectRe: [OOPS] [resolution]
Brian Gerst <bgerst@didntduck.org>, on Tue Aug 21, 2001 [11:37:40 PM] said:
> Paul wrote:
> >
> > Brian Gerst <bgerst@didntduck.org>, on Tue Aug 21, 2001 [10:45:51 PM] said:
> > > > CPU: 0
> > > > EIP: 0010:[<c0180a18>]
> > > > Using defaults from ksymoops -t elf32-i386 -a i386
> > > > EFLAGS: 00010002
> > > > eax: 00001000 ebx: c4562368 ecx: 00000000 edx: 00000001
> > > > esi: c4562368 edi: c4a954d4 ebp: 00000001 esp: c6887d88
> > > > ds: 008 es: 0000 ss: 0018
> > > ^^^^
> > > Here is your problem. %es is set to the null segment. I had my
> > > suspicions about the segment reload optimisation in the -ac kernels, and
> > > this proves it. Try backing out the changes to arch/i386/kernel/entry.S
> > > and include/asm-i386/hw_irq.h and see if that fixes the problem.
> > >

[....]
> Try the attached diff.
>

Dear Brian;

Well, with this backed out, I cannot get an oops anymore.
Thanks.

Paul
set@pobox.com

> --
> Brian Gerst
> --- linux-2.4.8-ac7/arch/i386/kernel/entry.S Mon Aug 20 19:21:49 2001
> +++ linux-2.4.8/arch/i386/kernel/entry.S Sat Jul 7 13:55:12 2001
> @@ -106,14 +106,10 @@
> popl %edi; \
> popl %ebp; \
> popl %eax; \
> - cmpl $__KERNEL_DS,(%esp); \
> - je 4f ; \
> 1: popl %ds; \
> 2: popl %es; \
> addl $4,%esp; \
> 3: iret; \
> -4: addl $12,%esp; \
> - iret; \
> .section .fixup,"ax"; \
> 4: movl $0,(%esp); \
> jmp 1b; \
> @@ -289,11 +285,9 @@
> pushl %esi # push the error code
> pushl %edx # push the pt_regs pointer
> movl $(__KERNEL_DS),%edx
> - cmpl %edx,%ecx
> - jz 1f
> movl %edx,%ds
> movl %edx,%es
> -1: GET_CURRENT(%ebx)
> + GET_CURRENT(%ebx)
> call *%edi
> addl $8,%esp
> jmp ret_from_exception
> --- linux-2.4.8-ac7/include/asm-i386/hw_irq.h Mon Aug 20 19:22:19 2001
> +++ linux-2.4.8/include/asm-i386/hw_irq.h Sat Jul 7 13:55:40 2001
> @@ -95,10 +95,6 @@
> #define __STR(x) #x
> #define STR(x) __STR(x)
>
> -/*
> - * A segment register reload is rather expensive. Try to avoid it
> - * if possible.
> - */
> #define SAVE_ALL \
> "cld\n\t" \
> "pushl %es\n\t" \
> @@ -110,12 +106,9 @@
> "pushl %edx\n\t" \
> "pushl %ecx\n\t" \
> "pushl %ebx\n\t" \
> - "movl $" STR(__KERNEL_DS) ",%eax\n\t" \
> - "cmpl %eax,7*4(%esp)\n\t" \
> - "je 1f\n\t" \
> - "movl %eax,%ds\n\t" \
> - "movl %eax,%es\n\t" \
> - "1:\n\t"
> + "movl $" STR(__KERNEL_DS) ",%edx\n\t" \
> + "movl %edx,%ds\n\t" \
> + "movl %edx,%es\n\t"
>
> #define IRQ_NAME2(nr) nr##_interrupt(void)
> #define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)

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