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plat/msdos386: fix: RM int 0x21 calls was clobbering high halves

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of esi and edi registers
This commit is contained in:
tkchia 2022-08-26 17:28:25 +00:00
parent cba54b205b
commit f8a6f92752
1 changed files with 13 additions and 20 deletions
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33
plat/msdos386/stub.s
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@ -3,14 +3,8 @@
! $State$ ! $State$
! $Revision$ ! $Revision$
! Declare segments (the order is important). #include "libsysasm.h"
.sect .text
.sect .rom
.sect .data
.sect .bss
.sect .text
.use16 .use16
exe_header: exe_header:
.data2 0x5a4d ! magic number .data2 0x5a4d ! magic number
@ -319,12 +313,12 @@ int21:
o32 or ebx, 0x210000 o32 or ebx, 0x210000
! Simulate interrupt in the high half of ebx. ! Simulate interrupt in the high half of ebx.
interrupt: interrupt:
mov (dpmi_eax), ax o32 mov (dpmi_eax), eax
mov (dpmi_ebx), bx o32 mov (dpmi_ebx), ebx
mov (dpmi_ecx), cx o32 mov (dpmi_ecx), ecx
mov (dpmi_edx), dx o32 mov (dpmi_edx), edx
mov (dpmi_esi), si o32 mov (dpmi_esi), esi
mov (dpmi_edi), di o32 mov (dpmi_edi), edi
pushf pushf
pop (dpmi_flags) pop (dpmi_flags)
mov ax, (rseg) mov ax, (rseg)
@ -340,12 +334,12 @@ interrupt:
xor cx, cx xor cx, cx
int 0x31 ! simulate DOS interrupt int 0x31 ! simulate DOS interrupt
pop es pop es
o32 movzx eax, (dpmi_eax) o32 mov eax, (dpmi_eax)
o32 movzx ebx, (dpmi_ebx) o32 mov ebx, (dpmi_ebx)
o32 movzx ecx, (dpmi_ecx) o32 mov ecx, (dpmi_ecx)
o32 movzx edx, (dpmi_edx) o32 mov edx, (dpmi_edx)
o32 movzx esi, (dpmi_esi) o32 mov esi, (dpmi_esi)
o32 movzx edi, (dpmi_edi) o32 mov edi, (dpmi_edi)
push (dpmi_flags) push (dpmi_flags)
popf popf
ret ret
@ -410,7 +404,6 @@ stack:
.space 512 .space 512
dosstack: dosstack:
TRANSFER_BUFFER_SIZE = 32*1024
transfer_buffer: transfer_buffer:
.space TRANSFER_BUFFER_SIZE .space TRANSFER_BUFFER_SIZE