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Jeff Parsons 2015-05-13 14:37:21 -07:00 • committed by jeffpar
commit 0ae5ab13a9
1 changed files with 5 additions and 5 deletions
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10
tests/pc/80386/tests.nasm
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@ -292,16 +292,16 @@ toProt32:
mov es,ax mov es,ax
; ;
; Of the 64Kb of scratch memory we allocated, the first 8Kb (0x2000) is being used for a ; 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, ; page directory and a single page table, so we have at least another 56Kb, at ESI+0x2000,
; to play with (I'm rounding down by 4Kb to be safe). ; 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 ; 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 add esi,0x2000 ; ESI -> bottom of scratch memory
mov ss,ax 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] lea ebp,[esp-4]
and ebp,0xffff ; EBP now mirrors SP instead of ESP and ebp,0xffff ; EBP now mirrors SP instead of ESP
mov edx,[ebp] mov edx,[ebp]