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|
; jewelforth
;; MACROS {{{
%macro pspush 1
lea r14, [r14-8]
mov qword [r14], %1
%endmacro
%macro pspop 1
mov %1, qword [r14]
lea r14, [r14+8]
%endmacro
;;; dictionary macros {{{
%define mac_latest 0 ; updated through defdict
%macro defdict 3 ; name asm-label flags
%strlen slen %1
global lfa_%2
lfa_%2: dq mac_latest
%define mac_latest lfa_%2
ffa_%2: db %3 ; FFA
nfa_%2: dw slen ; NFA
db %1
db 0
%endmacro
%macro defword 3
defdict %1, %2, %3
%2:
%endmacro
%macro defconst 4 ; ... value
defdict %1, %2, %3
%define %2 %4
pspush qword %4
ret
%endmacro
%macro defvar 4 ; ... default-value
%2: dq %4
defdict %1, %2, %3
pspush qword %2
ret
%endmacro
%assign smudge_mask 0x1
%assign immediate_mask 0x2
%assign false 0x0
%assign true 0xffffffffffffffff
%assign interpreting 0x0
%assign compiling 0xffffffffffffffff
;;; }}}
;; syscall
%assign __NR_read 0
%assign __NR_write 1
%assign __NR_brk 12
%assign __NR_exit 60
;; }}}
section .bss
wstack_b: resq 2047
wstack: resq 1
section .text
global _start
_start:
; init
mov r14, wstack ; point SP to top
; EXPAND BRK
xor rdi, rdi ; brk syscall called with 0 gives the current brk
mov rax, __NR_brk
syscall
mov qword [here], rax
mov qword [h0], rax
add rax, 0x9c400 ; 640kb, entirely arbitrary
mov rdi, rax
mov rax, __NR_brk
syscall ; if this fails, have fun
mov qword [hend], rax
call interpret
mov rdi, 0
mov rax, __NR_exit
syscall
defword "bye", bye, 0
mov rdi, 0
mov rax, __NR_exit
syscall
ret ; will not be reached
defword "@", fetch, 0
pspop r11
mov r12, qword [r11]
pspush r12
ret
defword "c@", cfetch, 0
pspop r11
xor r12, r12
mov r12b, [r11]
pspush r12
ret
defword "!", store, 0
pspop r11
pspop r12
mov qword [r11], r12
ret
defword "c!", cstore, 0
pspop r11
pspop r12
mov [r11], r12b
ret
; stage 1 parser. very rudimentary, does not recognise numbers,
; only recognises newlines and spaces as whitespace.
; since it will only parse a little bit of the init file
; there won't be any error checking either.
defword "parse", parse, 0
mov r13, qword [to_in]
add r13, initfile
mov r12b, byte [r13]
.wsloop: ; skip initial ws
cmp r12b, 0x20
je .wsloop_cont
cmp r12b, 0x0a
jne .wordloop_start
.wsloop_cont:
inc r13
mov r12b, byte [r13]
jmp .wsloop
.wordloop_start:
push r13 ; keep start address of this word for later
mov r11, 1 ; W: word length count
.wordloop:
cmp r12b, 0x20
je .wordloop_end
cmp r12b, 0x0a
je .wordloop_end
inc r11
inc r13
mov r12b, byte [r13]
jmp .wordloop
.wordloop_end:
dec r11
sub r13, initfile
mov qword [to_in], r13
pop r13
pspush r13 ; c-addr
pspush r11 ; u
ret
; probably fucked up and broken. have not tested any of this yet
defword "find", find, 0
pspop r10 ; u
pspop r11 ; c-addr
mov r12, latest
mov r13, qword [r12]
mov r12, r13
.check_smudge:
add r13, 8
mov r9b, byte [r13]
test r9b, smudge_mask
jnz .no
.no_smudge:
inc r13
mov r9w, word [r13]
cmp r9w, r10w
jne .no
mov rsi, r13
add rsi, 2
mov rdi, r11
mov rcx, r10
repz cmpsb
jnz .no
sub r13, 9
pspush r13
mov r13, true
pspush r13
ret
.no:
mov r13, qword [r12]
mov r12, r13
cmp r13, 0 ; end of dictionary? fallthrough to notfound if so
jne .check_smudge
mov r13, false
pspush r13
ret
; stage 1 interpreter, just reads from initfile
defword "interpret", interpret, 0
.loop:
call parse
call find
pspop r11 ; assume it exists for testing
call to_cfa
pspop r11
call r11
ret
defword ">cfa", to_cfa, 0
pspop r11
add r11, 9
xor r12, r12
mov r12w, word [r11]
add r11, 2
add r11, r12
inc r11
pspush r11
ret
defword "compile,", compile_comma, 0
pspop r11
mov r12, [here]
; compile mov r11, [cfa]
mov word [r12], 0x94bb
add r12, 2
mov qword [r12], r11
add r12, 8
; compile call r11
mov word [r12], 0x41ff
add r12, 2
mov byte [r12], 0xd3
inc r12
mov qword [here], r12
ret
defword ":", colon, 0
ret
defword ";", semicolon, immediate_mask
ret
defvar ">in", to_in, 0, 0
defvar "state", state, 0, interpreting
defvar "here", here, 0, 0
defvar "h0", h0, 0, 0 ; beginning of user memory area
defvar "hend", hend, 0, 0 ; ending of user memory area
defvar "latest", latest, 0, lfa_latest
initfile:
incbin "jefs.fs"
initlen equ $ - initfile
initfile_end:
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