1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
; 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
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:
|
