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# Copyright (C) 2026 Sebastian G. Kirmayer <gloria@gloria-mundi.eu>
#
# This file is part of sysf-i386.
#
# sysf-i386 is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# sysf-i386 is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along
# with sysf-i386. If not, see <https://www.gnu.org/licenses/>.
#
rodata
align
L s
long s^
long $VAL_FIX
long s^
long $VAL_ABS
label term_fix
L s
long s^
long $VAL_READ
long s^
long $VAL_ABS
long s^
long $VAL_ABS
long s^
long $VAL_ABS
label term_read
L s
long s^
long $VAL_WRITE0
long s^
long $VAL_ABS
label term_write0
L s
long s^
long $VAL_WRITE1
long s^
long $VAL_ABS
label term_write1
L s
long s^
long $VAL_EXIT
label term_exit
bss
align
label alloc_next
long 0
data
align
label context_root
long 0
long 0
long 0
long 0x10
# Context elements:
# 0: parent
# 4: context
# 8: term
# 12: refcount
text
label execute
pushl 0
pushl term_exit
pushl context_root
pushl 0
pushl term_write1
pushl context_root
pushl 0
pushl term_write0
pushl context_root
pushl 0
pushl term_read
pushl context_root
pushl 0
pushl term_fix
pushl context_root
pushl 0
pushl %eax
pushl context_root
L exec_loop
movl @%esp+4 %eax
movl @%eax+-4 %ebx
testl %ebx %ebx
js special.
L var
movl @%esp %esi
L loop
decl %ebx %ebx
js done.
movl @%esi %esi
jmp loop^
L done
# %esi -- variable context
movl @%esi+8 %edi
# %edi -- new term
cmpl $VAL_ABS @%edi+-4
je no_writeback.
movl @%esp+8 %ebx
# %ebx -- old writeback
testl %ebx %ebx
jz no_old_writeback.
# write current value back
movl @%ebx+4 %eax
call unref
movl @%esp %ecx
incl @%ecx+12
movl %ecx @%ebx+4
movl @%esp+4 %ecx
movl %ecx @%ebx+8
movl %ebx %eax
call unref
L no_old_writeback
incl @%esi+12
movl %esi @%esp+8
L no_writeback
movl %edi @%esp+4
movl @%esi+4 %eax
incl @%eax+12
xchgl %eax @%esp
call unref
jmp exec_loop^
L special
cmpl $VAL_APP %ebx
je app.
cmpl $VAL_ABS %ebx
je abs.
cmpl $VAL_FIX %ebx
je fix.
cmpl $VAL_READ %ebx
je read.
cmpl $VAL_WRITE0 %ebx
je write0.
cmpl $VAL_WRITE1 %ebx
je write1.
cmpl $VAL_EXIT %ebx
je exit
ud2
L app
pushl 0
subl 8 %eax
movl %eax @%esp+8
pushl @%eax+-8
movl @%esp+8 %eax
incl @%eax+12
pushl %eax
jmp exec_loop^
L abs
popl %ebx
popl %ebp
popl %edi
# %ebx -- context
# %ebp -- term
# %edi -- writeback
testl %edi %edi
jz no_writeback.
movl @%edi+4 %eax
call unref
incl @%ebx+12
movl %ebx @%edi+4
movl %ebp @%edi+8
movl %edi %eax
call unref
L no_writeback
movl @alloc_next %eax
testl %eax %eax
jz no_next.
movl @%eax %ecx
movl %ecx @alloc_next
L have_ctx
movl %ebx @%eax
movl @%esp %ecx
movl %ecx @%eax+4
movl @%esp+4 %ecx
movl %ecx @%eax+8
movl 1 @%eax+12
movl %eax @%esp
subl 8 %ebp
movl %ebp @%esp+4
jmp exec_loop^
L no_next
movl @heap_ptr %esi
movl %esi %eax
addl 16 %esi
movl %esi @heap_ptr
cmpl @heap_end %esi
ja realloc.
jmp have_ctx^
L realloc
movl %eax %esi
call alloc
movl %esi %eax
jmp have_ctx^
L fix
movl @%esp %eax
incl @%eax+12
pushl %eax
pushl @%eax+8
movl @%eax+4 %eax
incl @%eax+12
pushl %eax
jmp exec_loop^
L read
call read
movl 1 %ebx
subl %eax %ebx
jmp var^
L write0
call write0
xorl %ebx %ebx
jmp var^
L write1
call write1
xorl %ebx %ebx
jmp var^
label unref
decl @%eax+12
jz free.
ret
L free
pushl %eax
movl @%eax %eax
call unref
movl @%esp %eax
movl @%eax+4 %eax
call unref
popl %eax
movl @alloc_next %ecx
movl %eax @alloc_next
movl %ecx @%eax
ret
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