Retro/pcjs
Watch
1
0
Fork
You've already forked pcjs
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Test comments

Browse source
This commit is contained in:
Jeff Parsons 2015-05-13 14:37:21 -07:00 • committed by jeffpar
commit 0ae5ab13a9
1 changed files with 5 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

10
tests/pc/80386/tests.nasm
View file

@ -292,16 +292,16 @@ toProt32:
mov es,ax
;
; Of the 64Kb of scratch memory we allocated, the first 8Kb (0x2000) is being used for a
; page directory and a single page table, so we have at least another 52Kb, at ESI+0x2000,
; to play with (I'm rounding down by 4Kb to be safe).
; page directory and a single page table, so we have at least another 56Kb, at ESI+0x2000,
; to play with.
;
; Let's use the top of that memory, ESI+0xd000, as the top of our stack. Note, however, that
; Let's use the top of that memory, ESI+0xe000, as the top of our stack. Note, however, that
; that guarantees ESI will be be greater than 0xffff, so as long as SS contains a 16-bit data
; segment, pushes will NOT be occurring where you expect.
; segment, pushes will NOT be occurring where you'd normally expect.
;
add esi,0x2000 ; ESI -> bottom of scratch memory
mov ss,ax
lea esp,[esi+0xe000] ; set ESP to bottom of scratch + 52K
lea esp,[esi+0xe000] ; set ESP to bottom of scratch + 56K
lea ebp,[esp-4]
and ebp,0xffff ; EBP now mirrors SP instead of ESP
mov edx,[ebp]