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| author | H. Peter Anvin <hpa@zytor.com> | 2011-05-02 14:33:24 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2011-05-02 14:44:46 -0700 |
| commit | 7806a49ab625ebeb1709e5e87299b64932b807a7 (patch) | |
| tree | 3f6e43d254544d1a7cf90ab688ac4cfde967c6db /arch | |
| parent | 2be19102b71c1a45d37fec50303791daa1a06869 (diff) | |
| download | op-kernel-dev-7806a49ab625ebeb1709e5e87299b64932b807a7.zip op-kernel-dev-7806a49ab625ebeb1709e5e87299b64932b807a7.tar.gz | |
x86, reboot: Fix relocations in reboot_32.S
The use of base for %ebx in this file is arbitrary, *except* that we
also use it to compute the real-mode segment. Therefore, make it so
that r_base really is the true address to which %ebx points.
This resolves kernel bugzilla 33302.
Reported-and-tested-by: Alexey Zaytsev <alexey.zaytsev@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Link: http://lkml.kernel.org/n/tip-08os5wi3yq1no0y4i5m4z7he@git.kernel.org
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/reboot_32.S | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/x86/kernel/reboot_32.S b/arch/x86/kernel/reboot_32.S index 29092b3..1d5c46d 100644 --- a/arch/x86/kernel/reboot_32.S +++ b/arch/x86/kernel/reboot_32.S @@ -21,26 +21,26 @@ r_base = . /* Get our own relocated address */ call 1f 1: popl %ebx - subl $1b, %ebx + subl $(1b - r_base), %ebx /* Compute the equivalent real-mode segment */ movl %ebx, %ecx shrl $4, %ecx /* Patch post-real-mode segment jump */ - movw dispatch_table(%ebx,%eax,2),%ax - movw %ax, 101f(%ebx) - movw %cx, 102f(%ebx) + movw (dispatch_table - r_base)(%ebx,%eax,2),%ax + movw %ax, (101f - r_base)(%ebx) + movw %cx, (102f - r_base)(%ebx) /* Set up the IDT for real mode. */ - lidtl machine_real_restart_idt(%ebx) + lidtl (machine_real_restart_idt - r_base)(%ebx) /* * Set up a GDT from which we can load segment descriptors for real * mode. The GDT is not used in real mode; it is just needed here to * prepare the descriptors. */ - lgdtl machine_real_restart_gdt(%ebx) + lgdtl (machine_real_restart_gdt - r_base)(%ebx) /* * Load the data segment registers with 16-bit compatible values |
