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# Some OS-specific preliminaries for Soso.
# Memory layout
#
# 0x40000000 - 0x40001ffff - for ELF code+data
# 0x40002000 - 0x401ffffff - for heap
== code 0x40000000
== data 0x40001000
# Syscalls
#
# We don't have libc, so we need to know Soso's precise syscall layout.
# https://github.com/ozkl/soso/blob/master/kernel/syscalltable.h
== code
syscall_exit: # status/ebx : int
b8/copy-to-eax 8/imm32
cd/syscall 0x80/imm8
syscall_read: # fd/ebx : int, buf/ecx : addr, size/edx : int -> nbytes-or-error/eax : int
b8/copy-to-eax 2/imm32
cd/syscall 0x80/imm8
c3/return
syscall_write: # fd/ebx : int, buf/ecx : addr, size/edx : int -> nbytes-or-error/eax : int
b8/copy-to-eax 3/imm32
cd/syscall 0x80/imm8
c3/return
syscall_open: # filename/ebx : (addr kernel-string), flags/ecx : int -> fd-or-error/eax : int
b8/copy-to-eax 0/imm32
cd/syscall 0x80/imm8
c3/return
syscall_close: # fd/ebx : int -> status/eax
b8/copy-to-eax 1/imm32
cd/syscall 0x80/imm8
c3/return
# anonymous mmap not implemented
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