minix/lib/ack/libe/arch/i386/em/em_sar4.s

33 lines
528 B
ArmAsm

.sect .text; .sect .rom; .sect .data; .sect .bss
.sect .text
.define .sar4
.sar4:
! ebx, descriptor address
! eax, index
sub eax,(ebx)
mov ecx,8(ebx)
imul ecx
pop ebx
pop edx ! base address
add edx,eax
sar ecx,1
jnb 1f
pop eax
movb (edx),al
jmp ebx
1:
sar ecx,1
jnb 1f
pop eax
o16 mov (edx),ax
jmp ebx
1:
xchg edi,edx ! edi = base address, edx is saved edi
mov eax,esi
mov esi,esp
rep movs
mov esp,esi
mov esi,eax
mov edi,edx
jmp ebx