be-code-6800.c: Compilation with -Os fails due to missing helper functions __addsp8/__subsp8/__modsp16

[zu2]

--- ../Fuzix-Compiler-Kit/be-code-6800.c    2024-10-29 04:20:36
+++ be-code-6800.c  2024-10-29 06:25:19
@@ -307,7 +308,7 @@
            return;
        }
        if (n <0 && n >= -255) {
-           printf("\tjsr __subsp8\n\t.byte %u\n", n & 0xFF);
+           printf("\tjsr __subsp8\n\t.byte %u\n", -n & 0xFF);
            return;
        }
        printf("\tjsr __modsp16\n\t.word %u\n", WORD(n));

__addsp8.s

;
    .export __addsp8
    .export __subsp8
    .export __modsp16
    .code

__addsp8:
    stab @tmp2+1
    stx @tmp
    tsx
    ldx 0,x
    ins
    ins
    sts @tmp3
    ldab @tmp3+1
    addb 0,x
    stab @tmp3+1
    bcc __addsp8_1
    inc @tmp3
__addsp8_1:
    inx
    stx @tmp1   ; return address
    ldx @tmp
    lds @tmp3
    ldab @tmp1+1
    pshb
    ldab @tmp1
    pshb
    ldab @tmp2+1
    rts

__subsp8:
    stab @tmp2+1
    stx @tmp
    tsx
    ldx 0,x
    ins
    ins
    sts @tmp3
    ldab @tmp3+1
    subb 0,x
    stab @tmp3+1
    bcc __addsp8_1
    dec @tmp3
    bra __addsp8_1

__modsp16:
    stab @tmp2+1
    staa @tmp2
    stx @tmp
    tsx
    ldx 0,x
    ins
    ins
    sts @tmp3
    ldab @tmp3+1
    ldaa @tmp3
    addb 1,x
    adca 0,x
    stab @tmp3+1
    staa @tmp3
    inx
    inx
    stx @tmp1   ; return address
    ldx @tmp
    lds @tmp3
    ldab @tmp1+1
    ldaa @tmp1
    pshb
    psha
    ldab @tmp2+1
    ldaa @tmp2
    rts

[EtchedPixels]

Added - need to sort them out for 6803 as well (6809 has leas, 6303 and 68HC11 will always use xgdx for hard cases)