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https://github.com/a2stuff/prodos-path.git
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macros to make relocation easier
This commit is contained in:
Joshua Bell
parent
5d56dd1e2a
commit
719bca04ac
104
path.s
104
path.s
@ -14,7 +14,7 @@
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;;; ============================================================
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;;;
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;;; Installed command memory structure:
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;;; * 3 pages - code, path buffers
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;;; * 2 pages - code, path buffer
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;;; TODO:
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;;; * Support multi-segment path (e.g. /hd/bin:/hd/extras/bin)
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@ -118,16 +118,44 @@ CASE_MASK = $DF
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;; Complete
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rts
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new_page:
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.byte 0
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page_delta:
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.byte 0
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.endproc
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;;; ============================================================
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;;;
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;;; Relocatable Section
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;;;
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;;; ============================================================
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;;; Use `reloc_counter ADDR` anywhere that needs the page updated
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;;;
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;;; Examples:
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;;;
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;;; reloc_point *+2 ; update MSB of following JSR
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;;; jsr routine
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;;;
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;;; reloc_point *+1 ; update MSB used in following LDA
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;;; lda #>routine
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::reloc_counter .set 0
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.macro reloc_point addr
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::.ident (.sprintf ("RL%04X", ::reloc_counter)) := addr
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::reloc_counter .set ::reloc_counter + 1
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.endmacro
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;;; Align handler to page boundary for easier relocation
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.res $2100 - *, 0
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;;; ============================================================
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;;; Command Handler
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;;; ============================================================
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;; Align handler to page boundary for easier
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;; relocation
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.res $2100 - *, 0
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.proc handler
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ptr := $06 ; pointer into VPATH
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tptr := $08 ; pointer into TOKEN_NAME_TABLE
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@ -138,15 +166,15 @@ CASE_MASK = $DF
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sta ptr+1
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;; Check for this command, character by character.
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page_num9 := *+2 ; address needing updating
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reloc_point *+2
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jsr skip_leading_spaces
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ldy #0 ; position in command string
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page_num6 := *+2 ; address needing updating
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reloc_point *+2
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nxtchr: jsr to_upper_ascii
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page_num1 := *+2 ; address needing updating
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reloc_point *+2
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cmp command_string,y
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bne check_if_token
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inx
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@ -161,7 +189,7 @@ nxtchr: jsr to_upper_ascii
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;; Point BI's parser at the command execution routine.
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lda #<execute
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sta XTRNADDR
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page_num2 := *+1 ; address needing updating
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reloc_point *+1
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lda #>execute
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sta XTRNADDR+1
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@ -182,13 +210,13 @@ nxtchr: jsr to_upper_ascii
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check_if_token:
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;; Is a PATH set?
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page_num17 := *+2 ; address needing updating
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reloc_point *+2
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lda path_buffer
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beq not_ours
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page_num10 := *+2 ; address needing updating
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reloc_point *+2
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jsr skip_leading_spaces
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page_num7 := *+2 ; address needing updating
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reloc_point *+2
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jsr to_upper_ascii
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cmp #'A'
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@ -216,7 +244,7 @@ mloop: iny ; Advance through token table
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;; Check for match
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next_char:
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page_num8 := *+2 ; address needing updating
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reloc_point *+2
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jsr to_upper_ascii ; Next character
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;; NOTE: Does not skip over spaces, unlike BASIC tokenizer
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@ -229,7 +257,7 @@ next_char:
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;; Otherwise, advance to next token
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next_token:
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page_num12 := *+2 ; address needing updating
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reloc_point *+2
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jsr skip_leading_spaces
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sloop: lda (tptr),y ; Scan table looking for a high bit set
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iny
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@ -251,10 +279,10 @@ not_ours:
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maybe_invoke:
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;; Compose path
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page_num14 := *+2 ; address needing updating
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reloc_point *+2
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ldx path_buffer
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ldy #1
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page_num11 := *+2 ; address needing updating
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reloc_point *+2
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: lda path_buffer,y
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sta (ptr),y
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iny
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@ -265,9 +293,9 @@ maybe_invoke:
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sta (ptr),y
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iny
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page_num15 := *+2 ; address needing updating
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reloc_point *+2
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jsr skip_leading_spaces
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page_num16 := *+2 ; address needing updating
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reloc_point *+2
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: jsr to_upper_ascii
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cmp #'.'
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beq ok
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@ -388,10 +416,10 @@ execute:
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;; Show current path
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ldx #0
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page_num3 := *+2 ; address needing updating
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reloc_point *+2
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: cpx path_buffer
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beq done
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page_num4 := *+2 ; address needing updating
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reloc_point *+2
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lda path_buffer+1,x
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ora #$80
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jsr COUT
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@ -409,7 +437,7 @@ set_path:
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lda (ptr),y
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tay
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: lda (ptr),y
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page_num5 := *+2 ; address needing updating
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reloc_point *+2
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sta path_buffer,y
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dey
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bpl :-
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@ -459,29 +487,15 @@ path_buffer:
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next_command := handler::next_command
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;;; ============================================================
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;;; Installation Data
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new_page:
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.byte 0
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page_delta:
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.byte 0
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;;;
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;;; Relocation Table
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;;;
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;;; ============================================================
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relocation_table:
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.byte (table_end - *) / 2
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.addr handler::page_num1
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.addr handler::page_num2
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.addr handler::page_num3
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.addr handler::page_num4
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.addr handler::page_num5
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.addr handler::page_num6
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.addr handler::page_num7
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.addr handler::page_num8
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.addr handler::page_num9
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.addr handler::page_num10
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.addr handler::page_num11
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.addr handler::page_num12
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.addr handler::page_num14
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.addr handler::page_num15
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.addr handler::page_num16
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.addr handler::page_num17
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table_end := *
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.byte ::reloc_counter
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.repeat ::reloc_counter, rc
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.addr ::.ident (.sprintf ("RL%04X", rc))
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.endrepeat
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;;; ============================================================
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