diff options
Diffstat (limited to 'programs/subasm.s')
| -rw-r--r-- | programs/subasm.s | 137 |
1 files changed, 9 insertions, 128 deletions
diff --git a/programs/subasm.s b/programs/subasm.s index e5d620f..86a8837 100644 --- a/programs/subasm.s +++ b/programs/subasm.s @@ -5,6 +5,8 @@ MAX_SYM = $800 ; Max symbol size. +.include "utils.s" + .org incl ; String Constants. asm_name: @@ -150,9 +152,8 @@ cmd_srt: .word run .word set -; Hex character table. -hex_char: - .byte "0123456789ABCDEF" +; Data entry point for utility subroutines. +util_data: ; Token table. @@ -283,131 +284,6 @@ shcmd_end: ply #2 ; Get back the screen buffer position. rts ; End of chk_shcmd. -print_hex: - pha #8 ; Preserve the hex value. - and #0 ; Reset A. - ldb #1 ; Set the second pointer - lda.w #hex_char ; to the start of hex character table. - jsr set_ptr ; - inb ; Set the third pointer - lda.d #hex_str ; to the end of hex string buffer. - clc ; Do a non carrying add. - adc #$10 ; - jsr set_ptr ; - ldb #0 ; Reset B. - pla #8 ; Get the hex value back. -pnthex_lp: - pha #8 ; Preserve the hex value. - and #$F ; Mask the lowest nibble. - phy #2 ; Preserve the screen buffer position. - tay ; Get the index for the hex digit. - lda (ptr2), y ; Get the hex digit. - dec ptr3 ; Decrement the string pointer. - sta (ptr3) ; Save the hex digit character in the string. - ply #2 ; Get back the screen buffer position. - pla #8 ; Get the hex value back. -pnthex_lp1: - cpx #1 ; Is the digit count less than one? - bcc pnthex_lp2 ; Yes, so don't decrement the digit count. - dex ; No, but was the digit count zero, when decremented? - beq pnthex_end ; Yes, so we're done. - jmp pnthex_lp3 ; No, so get the next nibble. -pnthex_lp2: - ldb #1 ; Enable auto digit count. -pnthex_lp3: - lsr #4 ; No, but is the next nibble, a zero? - beq pnthex_lp4 ; Yes, so check if auto digit count is enabled. - jmp pnthex_lp ; No, so print the next digit. -pnthex_lp4: - cpb #1 ; Is auto digit count enabled? - beq pnthex_end ; Yes, so we're done. - jmp pnthex_lp ; No, so keep printing more digits. -pnthex_end: - rts ; End of print_hex. - -charcpy: - ldx idx3 ; Get the string index. - sta strbuf, x ; Save it in the string buffer. - inc idx3 ; Increment the string index. - rts ; End of charcpy. - -print_hi: - and #0 ; Reset A. - sta idx3 ; Clear the string index. - lda #'$' ; Print the hex delimiter. - jsr charcpy ; - lda.q idx0 ; Get the masked address. - ldx #$10 ; Set digit count to 16. - jsr print_hex ; Print the address. - lda.q hex_str ; Get the lower half of the string. - sta.q strbuf+1 ; Save it in the string buffer. - lda.q hex_str+8 ; Get the upper half of the string. - sta.q strbuf+9 ; Save it in the string buffer. - ldx #$11 ; Add 16 to the index. - stx idx3 ; - lda #':' ; Print a colon. - jsr charcpy ; - lda # ' ' ; Print a space. - jsr charcpy ; - rts ; End of print_hi. - -print_lo: - lda #0 ; Reset A. - sta idx3 ; Clear the string index. -pntlo_lp: - ldx #2 ; Set digit count to 2. - pha #1 ; Preserve the nibble offset. - jsr print_hex ; Print the low nibble offset. - lda.w (ptr3) ; Get the two digits. - jsr charcpy ; Copy the first digit. - lsr #8 ; Copy the next digit. - jsr charcpy ; - pla #1 ; Get the nibble offset back. - inc ; Increment the offset. - cmp #$10 ; Are we at the last offset? - bcs pntlo_end ; Yes, so we're done. -pntlo_lp1: - pha #1 ; No, so preserve the nibble offset. - lda #' ' ; Add a space to the string buffer. - jsr charcpy ; - pla #1 ; Get the nibble offset back. - jmp pntlo_lp ; Keep looping. -pntlo_end: - inx ; Increment the index by one. - lda #0 ; Null terminate the string buffer. - sta strbuf, x ; - tax ; Reset X. - lda.d #strbuf ; Print the string buffer. - jsr print_str ; - rts ; End of print_lo. - -print_chunk: - ldx #0 ; Reset X. - phy #2 ; Preserve the screen buffer index. - txy ; Copy the byte index to it. -pntchnk_lp: - and #0 ; Reset A. - ldx #2 ; Set the digit count to 2. - lda (idx0), y ; Get the byte at that address. - jsr print_hex ; Print the byte. - lda.w (ptr3) ; Get the two digits. - jsr charcpy ; Copy the first digit. - lsr #8 ; Copy the next digit. - jsr charcpy ; - iny ; Increment the byte index. - cpy #$10 ; Have we read 16 bytes? - beq pntchnk_end ; Yes, so we're done. - lda #' ' ; No, so add a soace to the string buffer. - jsr charcpy ; - jmp pntchnk_lp ; Keep looping. -pntchnk_end: - ply #2 ; Get the screen buffer index back. - inx ; Increment the index by one. - and #0 ; Null terminate the string. - sta strbuf, x ; - tax ; Reset X. - sta idx3 ; Clear the string index. - rts ; End of print_chunk. viewmem: lda.q prg_cnt ; Get the program counter. @@ -469,3 +345,8 @@ set: nop ; set_end: rts ; End of set. + + +; Entry point for utility subroutines. +utils: + |