;;; ============================================================
segment readable writable executable
-
- WORD return_stack,'RS',dovariable
- ;; The return stack
- rb 1048576 ; 1 Mb return stack
-RS_TOP: ; The initial rbp
- WORD data_stack,'DS',dovariable
- ;; The data stack
- rb 1048576 ; 1 Mb data stack
-DS_TOP: ; The initial rsp
+;;; ========================================
+;;; These are the core "execution semantics" words, which are placed
+;;; first so as to remain at the same binary address at successive
+;;; compilations, which is helful for declaring special debugging gdb
+;;; aliases.
+;;;
+;;; The DO* words are declared as "variables" to provide their
+;;; assembled address when used in FORTH.
+;;;
+;;; The register context at entry to an "execution semantcs" code
+;;; snippets is:
+;;; rax = cfa* of word to execute
+;;; rsi = cell* in the calling definition, after calling cell
+;;; rsp = data stack pointer
+;;; rbp = return stack pointer
+;;;
- WORD inline_code,'[ASM]',fasm
- ;; ( -- )
- ;; This transitions execution into inline assembler in the
- ;; calling word defintion. Note that it stops advancing rsi;
- ;; code should use FORTH macro to reenter forth execution, or
- ;; exit to the calling definition via "jmp exit".
- jmp qword rsi
+previous_word = 0 ; Used for chaining the words
- WORD p_exit, 'EXIT',fasm
- ;; ( -- ) ( R: addr -- )
- ;; Returns execution to the calling definition as per the
- ;; return stack.
-exit:
- popr rsi
- next
+ WORD p_dofasm,'doFASM',dovariable
+ ;; Execution semantics for assembly words.
+dofasm:
+ add rax,8
+ jmp rax
-;;; Execution semantics for FORTH defition word
-;;; At entry, rsi points into the calling definition, at the cell
-;;; following the cell indicating this word, rax points to the CFA of
-;;; this word.
+ WORD p_doforth,'doFORTH',dovariable ;
+ ;; Execution semantics for FORTH defition word.
doforth:
pushr rsi
lea rsi, [rax+8] ; rsi = the DFA of the rax word
next
-;;; Execution semantics for DOES>
-;;; The cell at [cfa-8] holds an adjustment offset.
+ WORD p_dodoes,'doDOES',dovariable
+ ;; Execution semantics for DOES>
+ ;; [cfa-8] holds the adjustment offset ("does offset")
dodoes:
pushr rsi
lea rsi, [rax+8] ; rsi = the DFA of the rax word
- add rsi,[rax-8] ; adjust rsi to the DOES> part
+ add rsi,qword [rax-8] ; adjust rsi by the "does offset'
next
+ WORD p_dovariable,'doVARIABLE',dovariable
;; Execution semantics for a variable ( -- addr )
;; rax points to CFA field
dovariable:
- add rax,8
+ lea rax, [rax+8] ; rsi = the DFA of the rax word
push rax
next
- ;; Execution semantics for a constant ( -- v )
+ WORD p_dovalue,'doVALUE',dovariable
+ ;; Execution semantics for a value constant ( -- v )
;; rax points to CFA field
dovalue:
- push qword [rax+8]
+ lea rax, [rax+8] ; rsi = the DFA of the rax word
+ push qword [rax]
next
+ WORD p_dostring,'doSTRING',dovariable
;; Execution semantics for a string constant ( -- addr n )
;; rax points to CFA field
dostring:
- add rax,8
- xor rbx,rbx
- mov bl,[rax]
- inc rax
- push rax
- push rbx
+ lea rax, [rax+8] ; rsi = the DFA of the rax word
+ pushpname rax
next
-include 'wordlists.asm'
+ WORD p_calltrace,'[calltrace]',dovalue
+ ;; Common call point for debugging
+ ;; rax = cfa of called word
+ ;; rsi = cell* of next forth word
+ ;; [$rsp] = from where the call was
+ ret
+
include 'syscalls.asm'
+
+;;; ========================================
+;;; The stacks are placed here.
+
+ ;segment readable writable
+
+ WORD return_stack,'RETURN-STACK',dovariable
+ ;; The return stack
+ BLOCK RS_TOP
+ rb 1048576 ; 1 Mb return stack
+RS_TOP: ; The initial rbp
+
+last_system_word:
+ WORD data_stack,'DATA-STACK',dovariable
+ ;; The data stack
+ BLOCK DS_TOP
+ rb 1048576 ; 1 Mb data stack
+DS_TOP: ; The initial rsp
+
+
+;;; ========================================
+;;; Core execution control words
+
+ ;segment readable executable
+
+include 'signals.asm'
+
+;;; At fasm compilation: reset previous_word to make a new word list
+;;; Words above belong to the SYSTEM wordlist, and the following
+;;; belong to the FORTH wordlist.
+previous_word = 0
+
+ WORD p_system,'SYSTEM',dovariable
+ ;; ( -- dfa )
+ ;; The SYSTEM word list
+ dq last_system_word ; tfa of last SYSTEM word
+ dq p_forth_DFA ; dfa of successor word list
+
+ WORD inline_code,'[ASM]',fasm
+ ;; ( -- )
+ ;; This transitions execution into inline assembler in the
+ ;; calling word defintion. Note that it stops advancing rsi;
+ ;; code should use FORTH macro to reenter forth execution, or
+ ;; exit to the calling definition via "jmp exit".
+ jmp qword rsi
+
+ WORD p_execute,'EXECUTE',fasm
+ ;; ( cfa -- )
+ ;; Execute the word
+ pop rax
+ jmp qword [rax] ; goto code of that FORTH word (64 bit jump)
+
+ WORD p_exit, 'EXIT',fasm
+ ;; ( -- ) ( R: addr -- )
+ ;; Returns execution to the calling definition as per the
+ ;; return stack.
+exit:
+ popr rsi
+ next
+
+ ;; TERMINATE0 terminates the program with code 0
+ ;; ( -- )
+ WORD p_terminate, 'TERMINATE0',fasm
+ pop rdx
+terminate_special:
+ mov eax,60
+ syscall
+
+;;; ========================================
+;;; Core extension(s)
+
+ ;segment readable writable executable
+
+include 'control.asm'
+include 'wordlists.asm'
include 'memory.asm'
include 'stack.asm'
include 'math.asm'
+include 'logic.asm'
include 'stdio.asm'
+include 'compile.asm'
WORD p_program_version,'PROGRAM_VERSION',dostring
- STRING 'RRQ Forth version 0.1 - 2021-05-13',10
+ STRING 'RRQ Forth version 0.1 - 2021-05-22',10
WORD p_stdin,'STDIN',dovalue
;; Initialised to hold a STREAM for fd 0
dq 0
+
+ WORD p_args,'MAIN-ARGS',dovalue
+ ;; Pointer to initial argument block
+ dq 0 ; *(int argc,(char*[argc]) argv)
+
+ WORD p_verboseQ,'VERBOSE?',dovariable
+ ;; Flags whether the running is in verbose mode ot not
+ dq 0 ;
+
+ WORD p_lparen,'(',fasm,IMMEDIATE
+ pushr rsi
+p_lparen_loop:
+ DOFORTH p_stdin, p_read_word
+ pop rax
+ pop rbx
+ cmp rax,0 ; end of stream
+ je p_lparen_exit
+ cmp rax,1
+ jne p_lparen_loop
+ push rbx
+ push qword ')'
+ push 1
+ DOFORTH p_strncmp
+ pop rax
+ cmp rax,0
+ jne p_lparen_loop
+p_lparen_exit:
+ popr rsi
+ next
+;;; ******** The main entry point. ********
+;;; This could be set up as a WORD but it isn't
+
+main:
+ ;; Initial rsp points to the arguments block of size (64 bits)
+ ;; followed by the argument pointers.
+ mov qword [p_args_DFA],rsp
+ mov rbp,RS_TOP
+ call p_setup_signals_DFA
+ call main_is_verbose
+ mov qword [p_verboseQ_DFA],rdx
+ jmp p_quit_DFA ; QUIT
+
+ ;; Subroutine to check the command line for a "-v"
+ ;; return boolean in rdx
+ ;; implementation for that 2 byte asciiz string
+main_is_verbose_data:
+ db '-v',0
+
+main_is_verbose:
+ mov rbx,qword [p_args_DFA] ; Pointer to main arguments
+ mov r8,qword [rbx] ; r8 = count of pointers
+ xor rdx,rdx
+ cld
+main_is_verbose_next:
+ dec r8
+ jl main_is_not_verbose
+ add rbx,8
+ mov rsi,qword [rbx]
+ mov rdi,main_is_verbose_data
+main_is_verbose_loop:
+ cmpsb
+ jne main_is_verbose_next
+ cmp byte[rsi-1],0
+ jne main_is_verbose_loop
+ not rdx
+main_is_not_verbose:
+ ret
+
+;;; This word is also the last word before syscalls
+last_forth_word:
WORD p_quit,'QUIT',fasm
;; QUIT is the program entry point ********************
-main:
+
mov rsp,DS_TOP
mov rbp,RS_TOP
- ;; Initialize STREAM STDIN
+ cmp qword [p_stdin_DFA],0
+ jne p_quit_INITIALIZED
+ ;; Initialize STDIN
push 0
push 10000
DOFORTH p_stream
- pop qword [p_stdin_DFA]
+ pop qword [p_stdin_DFA] ; Assign STDIN
+p_quit_INITIALIZED:
;; Initial blurb
- push qword 1 ; stdout
- DOFORTH p_program_version ; version string => ( s n )
- DOFORTH sys_write ; printout
- pop rax ; ignore errors
-
- DOFORTH p_words
-
- push 0
- DOFORTH sys_exit
+ FORTH
+ dq p_verboseQ
+ dq p_get
+ BRANCH 0,p_quit_EVAL
+ dq p_program_version
+ dq p_tell
+p_quit_EVAL:
+ dq p_stdin
+ dq p_evaluate_stream
+ BRANCH 0,p_quit_ERROR
+ dq p_false
+ dq sys_exit
+p_quit_ERROR:
+ dq p_literal_string
+ STRING 10,'*** Unknown word: '
+ dq p_tell
+ dq p_this_word
+ dq p_2get
+ dq p_tell
+ dq p_literal_string
+ STRING 10
+ dq p_tell
+ ENDFORTH
+ mov rbp,RS_TOP ; reset the return stack
+ jmp p_quit_INITIALIZED
- ;; TERMINATE0 terminates the program with code 0
- ;; ( v -- )
- WORD terminate, 'TERMINATE',fasm
- pop rdx
-terminate_special:
- mov eax,60
- syscall
-
-last_word:
- ;; FORTH is the last word of VOCABULARY FORTH
- WORD forth,'FORTH',dovalue
- dq forth_TFA
- dq 0
+;;; ========================================
+ ;segment readable writable
heap_start:
+ rb 1048576 ; +1 Mb heap
+ rb 1048576 ; +1 Mb heap
+ rb 1048576 ; +1 Mb heap
+ rb 1048576 ; +1 Mb heap
+ rb 1048576 ; +1 Mb heap
projects / rrq / rrqforth.git / blobdiff