34589e501f
The ROM is the same before and after this commit:
$ sha256sum fox32-orig.rom fox32.rom
75b169dafbf7dc77cd114f7d05d9c1e8459122bc2bd4178a90aba6fd8dc7372e fox32-orig.rom
75b169dafbf7dc77cd114f7d05d9c1e8459122bc2bd4178a90aba6fd8dc7372e fox32.rom
The conversion was performed with a few sed commands and manually
unrolled in monitor/keyboard.asm:
find -name '*.asm' | xargs sed -i -e 's/data.str \("[^"]*"\) data.8 0$/data.strz \1/g'
find -name '*.asm' | xargs sed -i -e 's/data.str \("[^"]*"\) data.8 0 /data.strz \1 /g'
find -name '*.asm' | xargs sed -i -e 's/data.str \("[^"]*"\) data.8 0x00 /data.strz \1 /g'
618 lines
13 KiB
NASM
618 lines
13 KiB
NASM
; exception handling routines
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; called if a divide by zero occurs
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; does not return, calls panic
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system_div_zero_handler:
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push r0
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mov r0, system_div_zero_str
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call debug_print
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call print_string_to_monitor
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pop r0
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jmp system_breakpoint_handler
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system_div_zero_str: data.str "Divide by zero" data.8 10 data.8 0
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; called if an invalid opcode is executed
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; does not return, calls panic
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system_invalid_op_handler:
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push r0
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mov r0, system_invalid_op_str
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call debug_print
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call print_string_to_monitor
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pop r0
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jmp system_breakpoint_handler
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system_invalid_op_str: data.str "Invalid opcode" data.8 10 data.8 0
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; called if a page fault occurs
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; does not return, calls panic
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system_page_fault_handler:
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push r0
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mov r0, system_page_fault_str
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call debug_print
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call print_string_to_monitor
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pop r0
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pop r1
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jmp system_breakpoint_handler
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system_page_fault_str: data.str "Page fault at virtual address r1" data.8 10 data.8 0
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; called upon execution of a `brk` instruction
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; ensure the stack has at least 256 bytes of free space before triggering this exception!!
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; this code is extremely ugly, but it works :P
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system_breakpoint_handler:
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add rsp, 4
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; push all registers once to save them
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push r31
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push r30
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push r29
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push r28
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push r27
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push r26
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push r25
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push r24
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push r23
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push r22
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push r21
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push r20
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push r19
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push r18
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push r17
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push r16
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push r15
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push r14
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push r13
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push r12
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push r11
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push r10
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push r9
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push r8
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push r7
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push r6
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push r5
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push r4
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push r3
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push r2
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push r1
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push r0
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; then push all registers again so they can be popped one by one to print to the monitor
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push r31
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push r30
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push r29
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push r28
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push r27
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push r26
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push r25
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push r24
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push r23
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push r22
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push r21
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push r20
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push r19
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push r18
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push r17
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push r16
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push r15
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push r14
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push r13
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push r12
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push r11
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push r10
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push r9
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push r8
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push r7
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push r6
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push r5
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push r4
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push r3
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push r2
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push r1
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push r0
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mov r0, system_breakpoint_str
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call debug_print
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call print_string_to_monitor
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; r0
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mov r0, system_breakpoint_r0_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r1
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mov r0, system_breakpoint_r1_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r2
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mov r0, system_breakpoint_r2_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r3
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mov r0, system_breakpoint_r3_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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; ---
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mov r0, 10
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call print_character_to_monitor
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; ---
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; r4
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mov r0, system_breakpoint_r4_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r5
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mov r0, system_breakpoint_r5_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r6
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mov r0, system_breakpoint_r6_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r7
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mov r0, system_breakpoint_r7_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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; ---
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mov r0, 10
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call print_character_to_monitor
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; ---
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; r8
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mov r0, system_breakpoint_r8_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r9
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mov r0, system_breakpoint_r9_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r10
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mov r0, system_breakpoint_r10_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r11
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mov r0, system_breakpoint_r11_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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; ---
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mov r0, 10
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call print_character_to_monitor
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; ---
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; r12
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mov r0, system_breakpoint_r12_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r13
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mov r0, system_breakpoint_r13_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r14
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mov r0, system_breakpoint_r14_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r15
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mov r0, system_breakpoint_r15_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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; ---
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mov r0, 10
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call print_character_to_monitor
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; ---
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; r16
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mov r0, system_breakpoint_r16_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r17
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mov r0, system_breakpoint_r17_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r18
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mov r0, system_breakpoint_r18_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r19
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mov r0, system_breakpoint_r19_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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; ---
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mov r0, 10
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call print_character_to_monitor
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; ---
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; r20
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mov r0, system_breakpoint_r20_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r21
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mov r0, system_breakpoint_r21_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r22
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mov r0, system_breakpoint_r22_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r23
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mov r0, system_breakpoint_r23_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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; ---
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mov r0, 10
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call print_character_to_monitor
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; ---
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; r24
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mov r0, system_breakpoint_r24_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r25
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mov r0, system_breakpoint_r25_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r26
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mov r0, system_breakpoint_r26_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r27
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mov r0, system_breakpoint_r27_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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; ---
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mov r0, 10
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call print_character_to_monitor
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; ---
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; r28
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mov r0, system_breakpoint_r28_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r29
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mov r0, system_breakpoint_r29_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r30
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mov r0, system_breakpoint_r30_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; r31
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mov r0, system_breakpoint_r31_str
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call print_string_to_monitor
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pop r0
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call print_hex_word_to_monitor
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; ---
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mov r0, 10
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call print_character_to_monitor
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; ---
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; rsp
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mov r0, system_breakpoint_rsp_str
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call print_string_to_monitor
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mov r0, rsp
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add r0, 133 ; account for the registers pushed above, and for the int calling convention
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call print_hex_word_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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mov r0, '|'
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call print_character_to_monitor
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mov r0, ' '
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call print_character_to_monitor
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; rip
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mov r0, system_breakpoint_rip_str
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call print_string_to_monitor
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mov r0, rsp
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add r0, 129 ; read instruction pointer from the stack
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mov r0, [r0]
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call print_hex_word_to_monitor
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; ---
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mov r0, 10
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call print_character_to_monitor
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; ---
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call invoke_monitor
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pop r0
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pop r1
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pop r2
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pop r3
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pop r4
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pop r5
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pop r6
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pop r7
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pop r8
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pop r9
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pop r10
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pop r11
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pop r12
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pop r13
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pop r14
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pop r15
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pop r16
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pop r17
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pop r18
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pop r19
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pop r20
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pop r21
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pop r22
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pop r23
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pop r24
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pop r25
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pop r26
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pop r27
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pop r28
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pop r29
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pop r30
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pop r31
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reti
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system_breakpoint_str: data.str "Breakpoint reached!" data.8 10 data.8 0
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system_breakpoint_r0_str: data.strz "r0: "
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system_breakpoint_r1_str: data.strz "r1: "
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system_breakpoint_r2_str: data.strz "r2: "
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system_breakpoint_r3_str: data.strz "r3: "
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system_breakpoint_r4_str: data.strz "r4: "
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system_breakpoint_r5_str: data.strz "r5: "
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system_breakpoint_r6_str: data.strz "r6: "
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system_breakpoint_r7_str: data.strz "r7: "
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system_breakpoint_r8_str: data.strz "r8: "
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system_breakpoint_r9_str: data.strz "r9: "
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system_breakpoint_r10_str: data.strz "r10: "
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system_breakpoint_r11_str: data.strz "r11: "
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system_breakpoint_r12_str: data.strz "r12: "
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system_breakpoint_r13_str: data.strz "r13: "
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system_breakpoint_r14_str: data.strz "r14: "
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system_breakpoint_r15_str: data.strz "r15: "
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system_breakpoint_r16_str: data.strz "r16: "
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system_breakpoint_r17_str: data.strz "r17: "
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system_breakpoint_r18_str: data.strz "r18: "
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system_breakpoint_r19_str: data.strz "r19: "
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system_breakpoint_r20_str: data.strz "r20: "
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system_breakpoint_r21_str: data.strz "r21: "
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system_breakpoint_r22_str: data.strz "r22: "
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system_breakpoint_r23_str: data.strz "r23: "
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system_breakpoint_r24_str: data.strz "r24: "
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system_breakpoint_r25_str: data.strz "r25: "
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system_breakpoint_r26_str: data.strz "r26: "
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system_breakpoint_r27_str: data.strz "r27: "
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system_breakpoint_r28_str: data.strz "r28: "
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system_breakpoint_r29_str: data.strz "r29: "
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system_breakpoint_r30_str: data.strz "r30: "
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system_breakpoint_r31_str: data.strz "r31: "
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system_breakpoint_rsp_str: data.strz "rsp: "
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system_breakpoint_rip_str: data.strz "rip: "
|