[src/trunk]: src/sys/arch/i386/stand/lib/crt/bootsect Be more careful with sa...

[fvdl <fvdl%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/0033b97e6b78
branches:  trunk
changeset: 472559:0033b97e6b78
user:      fvdl <fvdl%NetBSD.org@localhost>
date:      Sun May 02 12:44:34 1999 +0000

description:
Be more careful with saving registers around the "out of CHS range" check.

diffstat:

 sys/arch/i386/stand/lib/crt/bootsect/start_bootsect.S |  16 ++++++++++------
 1 files changed, 10 insertions(+), 6 deletions(-)

diffs (76 lines):

diff -r 0d76c991680e -r 0033b97e6b78 sys/arch/i386/stand/lib/crt/bootsect/start_bootsect.S
--- a/sys/arch/i386/stand/lib/crt/bootsect/start_bootsect.S     Sun May 02 12:20:01 1999 +0000
+++ b/sys/arch/i386/stand/lib/crt/bootsect/start_bootsect.S     Sun May 02 12:44:34 1999 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: start_bootsect.S,v 1.14 1999/04/30 15:31:18 christos Exp $     */
+/*     $NetBSD: start_bootsect.S,v 1.15 1999/05/02 12:44:34 fvdl Exp $ */
        
 /*
  * BIOS bootsector startup
@@ -146,7 +146,6 @@
        data32
        jb      read_error
 
-
        /***# find the first NetBSD partition *****/
        data32
        movl    $PARTSTART, %ebx
@@ -196,7 +195,9 @@
  * The reason to avoid int13 extensions as much as possible, is
  * that they're apparently buggy in some BIOSs.
  */
+       data32
        pushl   %ebx            /* save partition entry */
+       data32
        pushl   %edx            /* save drive number */
 
        data32
@@ -204,6 +205,7 @@
        data32
        xorl    %eax,%eax
 
+       data32
        movl    %ebx,%esi
 
        movb    $8,%ah
@@ -217,6 +219,7 @@
 
        movl    %ecx,%ebx
        shrl    $8,%ecx
+
        andl    $0xc0,%ebx
        shll    $2,%ebx
        orl     %ebx,%ecx
@@ -234,12 +237,12 @@
 
        data32
        cmpl    %eax, %ebx
-
+       data32
        popl    %edx
+       data32
        popl    %ebx
+       data32
        jl      tradint13
-
-1:
 /*
  * First we check for int13 extensions.
  * If they work, let's use them.
@@ -270,6 +273,7 @@
        data32
        movl    $0xaa55, %edi
        cmpl    %edi, %eax
+       data32
        jnz     tradint13
        testb   $1, %cl
        data32
@@ -405,7 +409,7 @@
        data32
        ret
 
-eread: .asciz          "Read error\r\n"
+eread: .asciz          "Read err\r\n"
 enoboot: .asciz                "No NetBSD part\r\n"
 efail: .asciz          "Boot failed\r\n"