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fix some bugs in track_int13.

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okuji 1999-10-25 04:03:56 +00:00
parent 7c1baa7ada
commit 821c05373e
2 changed files with 16 additions and 7 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
1999-10-25 OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp>
* stage2/asm.S [DEFINE_TRACK_INT13] (int3_handler): Save the
modified FLAGS in 6(%bp) instead of 4(%bp).
Decrease %bx before restoring the first instruction.
[DEFINE_TRACK_INT13] (track_int13): Go to the real mode before
setting up the registers for the int13 call.
1999-10-24 OKUJI Yoshinori <okuji@kuicr.kyoto-u.ac.jp>
Add the prototype of a function to probe I/O ports used for a

15
stage2/asm.S
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@ -226,16 +226,17 @@ ENTRY(track_int13)
movl %eax, 0x3 * 4
/* read the MBR to call int13 successfully */
movb 4(%ebp), %dl
call prot_to_real
.code16
movw $SCRATCHSEG, %ax
movw %ax, %es
xorw %bx, %bx
movw $1, %cx
xorb %dl, %dl
movb 4(%ebp), %dl
xorb %dh, %dh
call prot_to_real
.code16
movw $0x201, %ax
int $0x13
@ -380,17 +381,17 @@ int3_handler:
/* set the TF flag in the stack */
movw 6(%bp), %ax
orw $0x100, %ax
movw %ax, 4(%bp)
movw %ax, 6(%bp)
/* restore the first instruction */
movb ABS(int13_first_instruction), %al
movw 4(%bp), %bx
movw %bx, %ds
movw 2(%bp), %bx
decw %bx
movb %al, (%bx)
/* re-execute the first instruction */
decw %bx
movw %bx, 2(%bp)
popw %ds