38 lines
1.1 KiB
Diff
38 lines
1.1 KiB
Diff
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From: H. Peter Anvin <hpa@zytor.com>
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Date: Mon, 19 Feb 2007 23:54:58 +0000 (-0800)
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Subject: Comboot function READ DISK corrupts its arguments; fix.
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X-Git-Tag: syslinux-3.40-pre10^0~13^2
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X-Git-Url: http://www.jur-linux.org/git/?p=syslinux.git;a=commitdiff_plain;h=c7c51cdcd0a094c2588f8a816542bc57bb4efb34
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Comboot function READ DISK corrupts its arguments; fix.
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---
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diff --git a/comboot.doc b/comboot.doc
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index 8aaa0e7..0d70b48 100644
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--- a/comboot.doc
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+++ b/comboot.doc
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@@ -723,7 +723,7 @@ AX=0018h [3.30] Query custom font
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been loaded, AL contains zero.
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-AX=0019h [3.35] Read disk [SYSLINUX, ISOLINUX, EXTLINUX]
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+AX=0019h [3.xx] Read disk [SYSLINUX, ISOLINUX, EXTLINUX]
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Input: AX 0019h
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EDX Sector number
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ESI Reserved - MUST BE ZERO
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diff --git a/comboot.inc b/comboot.inc
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index 0f544c2..5df900f 100644
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--- a/comboot.inc
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+++ b/comboot.inc
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@@ -780,9 +780,9 @@ comapi_readdisk:
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or esi,P_EDI ; are reserved for future expansion
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jnz .err
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mov eax,P_EDX
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- mov bp,P_CX
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mov es,P_ES
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mov bx,P_BX
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+ mov bp,P_CX ; WE CANNOT use P_* after touching bp!
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call getlinsec
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clc
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ret
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