501 lines
7.5 KiB
ArmAsm
501 lines
7.5 KiB
ArmAsm
.syntax unified
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.cpu cortex-m0
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.align 2
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.thumb
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.thumb_func
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.include "registers.inc"
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.extern basic_rom
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.extern uart_putd
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.extern uart_getc
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.extern uart_ready
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.section .rodata
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dump0:
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.ascii "*** dump *** PC=$\000"
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dump1:
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.ascii " A=$\000"
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dump2:
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.ascii " X=$\000"
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dump3:
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.ascii " Y=$\000"
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dump4:
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.ascii " SP=$\000"
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dump5:
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.ascii " NV-B_DIZC=\000"
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ascii:
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.ascii "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?"
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logoi:
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.ascii "\033[24C\000"
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curleft:
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.ascii "\033[2D\000"
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.text
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.global cpu6502_dump
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.type cpu6502_dump, %function
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cpu6502_dump:
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push {r4-r7, lr}
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mov r4, r0
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mov r5, r1
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mov r6, r2
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mov r7, r3
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ldr r0, =#dump0
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bl uart_putstr
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mov r0, r4
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bl uart_puthex16
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ldr r0, =#dump1
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bl uart_putstr
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mov r0, r5
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bl uart_puthex
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ldr r0, =#dump2
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bl uart_putstr
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mov r0, r6
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bl uart_puthex
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ldr r0, =#dump3
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bl uart_putstr
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mov r0, r7
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bl uart_puthex
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ldr r0, =#dump4
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bl uart_putstr
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ldr r0, [sp, #20]
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bl uart_puthex
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ldr r0, =#dump5
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bl uart_putstr
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ldr r4, [sp, #24]
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mov r0, r4
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lsrs r0, #7
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bl uart_putx
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mov r0, r4
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movs r5, #1
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lsrs r0, #6
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ands r0, r5
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bl uart_putx
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movs r0, #'-'
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bl uart_putc
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mov r0, r4
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lsrs r0, #4
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ands r0, r5
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bl uart_putx
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movs r0, #'_'
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bl uart_putc
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mov r0, r4
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lsrs r0, #3
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ands r0, r5
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bl uart_putx
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mov r0, r4
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lsrs r0, #2
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ands r0, r5
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bl uart_putx
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mov r0, r4
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lsrs r0, #1
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ands r0, r5
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bl uart_putx
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mov r0, r4
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ands r0, r5
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bl uart_putx
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movs r0, #'\n'
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bl uart_putc
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pop {r4-r7, pc}
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.global cpu6502_load
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.type cpu6502_load, %function
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cpu6502_load:
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push {lr}
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movs r2, r0
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lsrs r0, #8
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cmp r0, #0xd0
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bhs 1f
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cmp r0, #0x04
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blo 2f
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cmp r0, #0x08
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blo 3f
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cmp r0, #0x10
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blo 4f
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cmp r0, #0xc0
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bhs 5f
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// Load from Fake RAM (0x1000-0xbfff)
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ldr r0, =#ramfake
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ldrb r0, [r0]
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pop {pc}
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1:
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// Load from ROM (0xd000-0xffff)
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movs r0, #0xd0
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lsls r0, #8
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subs r2, r2, r0
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ldr r0, =#basic_rom
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adds r0, r0, r2
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ldrb r0, [r0]
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pop {pc}
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2:
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// Load from RAM (0x0000-0x03ff)
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ldr r0, =#ram0000
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adds r0, r0, r2
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ldrb r0, [r0]
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pop {pc}
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3:
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// Load from VRAM (0x0400-0x07ff)
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movs r0, #0xff
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pop {pc}
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4:
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// Load from RAM (0x0800-0x0fff)
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movs r0, #0x08
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lsls r0, r0, #8
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subs r2, r2, r0
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ldr r0, =#ram0800
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adds r0, r0, r2
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ldrb r0, [r0]
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pop {pc}
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5:
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// Load from I/O (0xc000-0xcfff)
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mov r0, r2
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uxtb r0, r0
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cmp r0, #0x00
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bne 1f
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// 0xc000 KBD (Last Key Pressed + 128)
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3:
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bl uart_ready
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cmp r0, #0x00
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beq 2f
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bl uart_getc
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cmp r0, #0x0a
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bne 4f
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movs r0, #0x0d
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4:
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movs r1, #0x80
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orrs r0, r0, r1
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ldr r1, =#kbddata
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strb r0, [r1]
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// Drop old input data?
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// b 3b
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2:
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ldr r2, =#kbddata
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ldrb r0, [r2]
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pop {pc}
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1:
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cmp r0, #0x10
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bne 1f
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// 0xc010 KBDSTRB (Keyboard Strobe)
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ldr r2, =#kbddata
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ldrb r0, [r2]
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movs r1, #0x7f
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ands r0, r0, r1
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strb r0, [r2]
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1:
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movs r0, #0
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pop {pc}
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.global cpu6502_store
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.type cpu6502_store, %function
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cpu6502_store:
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movs r2, r0
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lsrs r0, #8
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cmp r0, #0xd0
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bhs 1f
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cmp r0, #0x04
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blo 2f
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cmp r0, #0x08
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blo 3f
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cmp r0, #0x10
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blo 4f
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cmp r0, #0xc0
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bhs 5f
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// Store to Fake RAM (0x1000-0xbfff)
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ldr r0, =#ramfake
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strb r1, [r0]
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mov pc, lr
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1:
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// Store to ROM (0xd000-0xffff)
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mov pc, lr
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2:
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// Store to RAM (0x0000-0x0400)
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ldr r0, =#ram0000
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adds r0, r0, r2
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strb r1, [r0]
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1:
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mov pc, lr
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3:
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// Store to VRAM (0x0400-0x07ff)
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ldr r0, =#scrmode
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ldrb r0, [r0]
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cmp r0, #0
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beq 2f
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push {lr}
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bl a2_tty
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pop {pc}
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2:
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cmp r1, #0xff
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beq 1b
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cmp r1, #0x7f
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beq 1b
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push {lr}
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push {r1-r2}
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movs r0, #0x1b
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bl uart_putc
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movs r0, #'['
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bl uart_putc
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pop {r1-r2}
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movs r3, #0x04
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lsls r3, r3, #8
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subs r3, r2, r3
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movs r2, r3
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movs r0, #0x7f
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ands r2, r2, r0
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lsrs r3, r3, #7
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cmp r2, #0x50
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blo 1f
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subs r2, r2, #0x50
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adds r3, r3, #0x10
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1:
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cmp r2, #0x28
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blo 1f
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subs r2, r2, #0x28
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adds r3, r3, #0x08
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1:
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mov r0, r3
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adds r0, r0, #1
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push {r1-r2}
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bl uart_putd
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movs r0, #';'
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bl uart_putc
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pop {r1-r2}
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mov r0, r2
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adds r0, r0, #1
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push {r1}
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bl uart_putd
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movs r0, #'H'
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bl uart_putc
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pop {r0}
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bl a2_putc
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pop {pc}
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4:
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// Store to (0x0800-0x0fff)
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movs r0, #0x08
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lsls r0, r0, #8
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subs r2, r2, r0
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ldr r0, =#ram0800
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adds r0, r0, r2
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strb r1, [r0]
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mov pc, lr
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5:
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// Store to I/O (0xc000-0xcfff)
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mov r0, r2
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uxtb r0, r0
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cmp r0, #0x00
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bne 1f
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// 0xc000 KBD (Last Key Pressed + 128)
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ldr r2, =#kbddata
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strb r1, [r2]
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mov pc, lr
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1:
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cmp r0, #0x90
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bne 1f
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// 0xc090 !!! GPIO0DIR
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ldr r0, =#GPIO0DIR
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str r1, [r0]
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mov pc, lr
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1:
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cmp r0, #0x91
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bne 1f
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// 0xc091 !!! GPIO1DIR
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ldr r0, =#GPIO1DIR
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str r1, [r0]
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mov pc, lr
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1:
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cmp r0, #0x92
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bne 1f
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// 0xc091 !!! GPIO2DIR
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ldr r0, =#GPIO2DIR
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str r1, [r0]
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mov pc, lr
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1:
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cmp r0, #0xa0
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bne 1f
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// 0xc0a0 !!! GPIO0DATA
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ldr r0, =#GPIO0DATA
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str r1, [r0]
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mov pc, lr
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1:
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cmp r0, #0xa1
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bne 1f
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// 0xc0a1 !!! GPIO1DATA
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ldr r0, =#GPIO1DATA
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str r1, [r0]
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mov pc, lr
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1:
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cmp r0, #0xa2
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bne 1f
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// 0xc0a1 !!! GPIO2DATA
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ldr r0, =#GPIO2DATA
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str r1, [r0]
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mov pc, lr
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1:
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mov pc, lr
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.global a2_init
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.type a2_init, %function
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a2_init:
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ldr r0, =#scrmode
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movs r1, #1
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strb r1, [r0]
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ldr r0, =#scrline
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movs r1, #0
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strb r1, [r0]
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mov pc, lr
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a2_putc:
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cmp r0, #0xff
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bne 1f
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mov pc, lr
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1:
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cmp r0, #0x7f
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bne 1f
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mov pc, lr
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1:
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push {lr}
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ldr r1, =#ascii
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movs r2, #0x3f
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ands r0, r0, r2
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adds r1, r1, r0
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ldrb r0, [r1]
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bl uart_putc
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pop {pc}
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a2_tty:
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push {lr}
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cmp r0, #1
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bne 1f
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// scrmode 1 (waiting for Apple ][ logo)
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cmp r1, #0xdb
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beq 2f
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pop {pc}
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2:
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ldr r0, =#logoi
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push {r1}
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bl uart_putstr
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pop {r1}
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movs r0, #2
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ldr r3, =#scrmode
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strb r0, [r3]
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1:
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cmp r0, #2
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bne 1f
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// scrmode 2 (showing Apple ][ logo)
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ldr r0, =#curleft
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push {r1}
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bl uart_putstr
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pop {r1}
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mov r0, r1
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cmp r0, #0xc1
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bne 2f
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ldr r1, =#scrmode
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movs r2, #3
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strb r2, [r1]
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2:
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bl a2_putc
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1:
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cmp r0, #3
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bne 1f
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// scrmode 3 (waiting for prompt)
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cmp r1, #0xdd
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beq 2f
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pop {pc}
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2:
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ldr r3, =#scrmode
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movs r0, #4
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strb r0, [r3]
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1:
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cmp r0, #4
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bne 3f
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// scrmode 4 (normal)
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1:
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movs r3, #0x04
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lsls r3, r3, #8
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subs r3, r2, r3
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movs r2, r3
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cmp r2, #0x27
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bne 1f
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cmp r1, #0xff
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beq 2f
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1:
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movs r0, #0x7f
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ands r2, r2, r0
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lsrs r3, r3, #7
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cmp r2, #0x50
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blo 1f
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subs r2, r2, #0x50
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adds r3, r3, #0x10
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1:
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cmp r2, #0x28
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blo 1f
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subs r2, r2, #0x28 // x
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adds r3, r3, #0x08 // y
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1:
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ldr r0, =#scrline
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ldrb r0, [r0]
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cmp r0, r3
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beq 1f
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movs r0, #0x0a
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push {r1-r3}
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bl uart_putc
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ldr r0, =#scrline
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ldrb r1, [r0]
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adds r1, r1, #1
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strb r1, [r0]
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pop {r1-r3}
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b 1b
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1:
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mov r0, r1
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bl a2_putc
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pop {pc}
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2:
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ldr r0, =#scrmode
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movs r1, #5
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strb r1, [r0]
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3:
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cmp r0, #5
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bne 2f
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// scrmode 5 (Waitinf for scroll finished)
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movs r3, #0x07
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lsls r3, r3, #8
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movs r0, #0xf7
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adds r3, r3, r0
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cmp r2, r3
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beq 1f
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pop {pc}
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1:
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ldr r0, =#scrline
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ldrb r0, [r0]
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movs r1, #24
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subs r1, r0
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1:
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movs r0, #0x0a
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push {r1}
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bl uart_putc
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pop {r1}
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subs r1, r1, #1
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bne 1b
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ldr r1, =#scrmode
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movs r0, #4
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strb r0, [r1]
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ldr r1, =#scrline
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movs r0, #23
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strb r0, [r1]
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2:
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pop {pc}
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.bss
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ram0000:
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.skip 0x400
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ram0800:
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.skip 0x800
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ramfake:
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.byte 0
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kbddata:
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.byte 0
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scrmode:
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.byte 0
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scrline:
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.byte 0
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