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fox32rom/exception.asm

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Add default page fault exception handler, bump version to 0.3.3
2022-08-16 02:32:50 +02:00
; exception handling routines
Ignore the pushed value in interrupts and exceptions Also handle more types of exceptions. *** First commit compatible with the C rewrite!! ***
2022-10-27 06:50:29 +02:00
; called if a divide by zero occurs
; does not return, calls panic
system_div_zero_handler:
mov r0, system_div_zero_str
jmp panic
system_div_zero_str: data.str "Divide by zero" data.8 10 data.8 0
; called if an invalid opcode is executed
; does not return, calls panic
system_invalid_op_handler:
mov r0, system_invalid_op_str
jmp panic
system_invalid_op_str: data.str "Invalid opcode" data.8 10 data.8 0
Add default page fault exception handler, bump version to 0.3.3
2022-08-16 02:32:50 +02:00
; called if a page fault occurs
; does not return, calls panic
system_page_fault_handler:
mov r0, system_page_fault_str
pop r1
jmp panic
system_page_fault_str: data.str "Page fault at virtual address r1" data.8 10 data.8 0
Ignore the pushed value in interrupts and exceptions Also handle more types of exceptions. *** First commit compatible with the C rewrite!! ***
2022-10-27 06:50:29 +02:00
; called upon execution of a `brk` instruction
Add a cool register dump thing to the breakpoint exception handler
2022-10-28 04:10:03 +02:00
; ensure the stack has at least 256 bytes of free space before triggering this exception!!
; this code is extremely ugly, but it works :P
Ignore the pushed value in interrupts and exceptions Also handle more types of exceptions. *** First commit compatible with the C rewrite!! ***
2022-10-27 06:50:29 +02:00
system_breakpoint_handler:
add rsp, 4
Add a cool register dump thing to the breakpoint exception handler
2022-10-28 04:10:03 +02:00
; push all registers once to save them
push r31
push r30
push r29
push r28
push r27
push r26
push r25
push r24
push r23
push r22
push r21
push r20
push r19
push r18
push r17
push r16
push r15
push r14
push r13
push r12
push r11
push r10
push r9
push r8
push r7
push r6
push r5
push r4
push r3
push r2
push r1
push r0
; then push all registers again so they can be popped one by one to print to the monitor
push r31
push r30
push r29
push r28
push r27
push r26
push r25
push r24
push r23
push r22
push r21
push r20
push r19
push r18
push r17
push r16
push r15
push r14
push r13
push r12
push r11
push r10
push r9
push r8
push r7
push r6
push r5
push r4
push r3
push r2
push r1
Ignore the pushed value in interrupts and exceptions Also handle more types of exceptions. *** First commit compatible with the C rewrite!! ***
2022-10-27 06:50:29 +02:00
push r0
mov r0, system_breakpoint_str
call debug_print
Add a cool register dump thing to the breakpoint exception handler
2022-10-28 04:10:03 +02:00
call print_string_to_monitor
; r0
mov r0, system_breakpoint_r0_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r1
mov r0, system_breakpoint_r1_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r2
mov r0, system_breakpoint_r2_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r3
mov r0, system_breakpoint_r3_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
; ---
mov r0, 10
call print_character_to_monitor
; ---
; r4
mov r0, system_breakpoint_r4_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r5
mov r0, system_breakpoint_r5_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r6
mov r0, system_breakpoint_r6_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r7
mov r0, system_breakpoint_r7_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
; ---
mov r0, 10
call print_character_to_monitor
; ---
; r8
mov r0, system_breakpoint_r8_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r9
mov r0, system_breakpoint_r9_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r10
mov r0, system_breakpoint_r10_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r11
mov r0, system_breakpoint_r11_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
; ---
mov r0, 10
call print_character_to_monitor
; ---
; r12
mov r0, system_breakpoint_r12_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r13
mov r0, system_breakpoint_r13_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r14
mov r0, system_breakpoint_r14_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r15
mov r0, system_breakpoint_r15_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
; ---
mov r0, 10
call print_character_to_monitor
; ---
Ignore the pushed value in interrupts and exceptions Also handle more types of exceptions. *** First commit compatible with the C rewrite!! ***
2022-10-27 06:50:29 +02:00
Add a cool register dump thing to the breakpoint exception handler
2022-10-28 04:10:03 +02:00
; r16
mov r0, system_breakpoint_r16_str
call print_string_to_monitor
Ignore the pushed value in interrupts and exceptions Also handle more types of exceptions. *** First commit compatible with the C rewrite!! ***
2022-10-27 06:50:29 +02:00
pop r0
Add a cool register dump thing to the breakpoint exception handler
2022-10-28 04:10:03 +02:00
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r17
mov r0, system_breakpoint_r17_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r18
mov r0, system_breakpoint_r18_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r19
mov r0, system_breakpoint_r19_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
; ---
mov r0, 10
call print_character_to_monitor
; ---
; r20
mov r0, system_breakpoint_r20_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r21
mov r0, system_breakpoint_r21_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r22
mov r0, system_breakpoint_r22_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r23
mov r0, system_breakpoint_r23_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
; ---
mov r0, 10
call print_character_to_monitor
; ---
; r24
mov r0, system_breakpoint_r24_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r25
mov r0, system_breakpoint_r25_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r26
mov r0, system_breakpoint_r26_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r27
mov r0, system_breakpoint_r27_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
; ---
mov r0, 10
call print_character_to_monitor
; ---
; r28
mov r0, system_breakpoint_r28_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r29
mov r0, system_breakpoint_r29_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r30
mov r0, system_breakpoint_r30_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; r31
mov r0, system_breakpoint_r31_str
call print_string_to_monitor
pop r0
call print_hex_word_to_monitor
; ---
mov r0, 10
call print_character_to_monitor
; ---
Show rsp and rip in the `brk` register dump
2022-11-13 06:02:32 +01:00
; rsp
mov r0, system_breakpoint_rsp_str
call print_string_to_monitor
mov r0, rsp
add r0, 133 ; account for the registers pushed above, and for the int calling convention
call print_hex_word_to_monitor
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
call print_character_to_monitor
; rip
mov r0, system_breakpoint_rip_str
call print_string_to_monitor
mov r0, rsp
add r0, 129 ; read instruction pointer from the stack
mov r0, [r0]
call print_hex_word_to_monitor
; ---
mov r0, 10
call print_character_to_monitor
; ---
Add a cool register dump thing to the breakpoint exception handler
2022-10-28 04:10:03 +02:00
call invoke_monitor
pop r0
pop r1
pop r2
pop r3
pop r4
pop r5
pop r6
pop r7
pop r8
pop r9
pop r10
pop r11
pop r12
pop r13
pop r14
pop r15
pop r16
pop r17
pop r18
pop r19
pop r20
pop r21
pop r22
pop r23
pop r24
pop r25
pop r26
pop r27
pop r28
pop r29
pop r30
pop r31
Ignore the pushed value in interrupts and exceptions Also handle more types of exceptions. *** First commit compatible with the C rewrite!! ***
2022-10-27 06:50:29 +02:00
reti
Add a cool register dump thing to the breakpoint exception handler
2022-10-28 04:10:03 +02:00
system_breakpoint_str: data.str "Breakpoint reached!" data.8 10 data.8 0
system_breakpoint_r0_str: data.str "r0: " data.8 0
system_breakpoint_r1_str: data.str "r1: " data.8 0
system_breakpoint_r2_str: data.str "r2: " data.8 0
system_breakpoint_r3_str: data.str "r3: " data.8 0
system_breakpoint_r4_str: data.str "r4: " data.8 0
system_breakpoint_r5_str: data.str "r5: " data.8 0
system_breakpoint_r6_str: data.str "r6: " data.8 0
system_breakpoint_r7_str: data.str "r7: " data.8 0
system_breakpoint_r8_str: data.str "r8: " data.8 0
system_breakpoint_r9_str: data.str "r9: " data.8 0
system_breakpoint_r10_str: data.str "r10: " data.8 0
system_breakpoint_r11_str: data.str "r11: " data.8 0
system_breakpoint_r12_str: data.str "r12: " data.8 0
system_breakpoint_r13_str: data.str "r13: " data.8 0
system_breakpoint_r14_str: data.str "r14: " data.8 0
system_breakpoint_r15_str: data.str "r15: " data.8 0
system_breakpoint_r16_str: data.str "r16: " data.8 0
system_breakpoint_r17_str: data.str "r17: " data.8 0
system_breakpoint_r18_str: data.str "r18: " data.8 0
system_breakpoint_r19_str: data.str "r19: " data.8 0
system_breakpoint_r20_str: data.str "r20: " data.8 0
system_breakpoint_r21_str: data.str "r21: " data.8 0
system_breakpoint_r22_str: data.str "r22: " data.8 0
system_breakpoint_r23_str: data.str "r23: " data.8 0
system_breakpoint_r24_str: data.str "r24: " data.8 0
system_breakpoint_r25_str: data.str "r25: " data.8 0
system_breakpoint_r26_str: data.str "r26: " data.8 0
system_breakpoint_r27_str: data.str "r27: " data.8 0
system_breakpoint_r28_str: data.str "r28: " data.8 0
system_breakpoint_r29_str: data.str "r29: " data.8 0
system_breakpoint_r30_str: data.str "r30: " data.8 0
system_breakpoint_r31_str: data.str "r31: " data.8 0
Show rsp and rip in the `brk` register dump
2022-11-13 06:02:32 +01:00
system_breakpoint_rsp_str: data.str "rsp: " data.8 0
system_breakpoint_rip_str: data.str "rip: " data.8 0
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