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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:
Show the actual rip value in the monitor when an exception occurs
2023-01-23 01:32:05 +01:00
push r0
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
mov r0, system_div_zero_str
Show the actual rip value in the monitor when an exception occurs
2023-01-23 01:32:05 +01:00
call debug_print
call print_string_to_monitor
pop r0
jmp system_breakpoint_handler
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_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:
Show the actual rip value in the monitor when an exception occurs
2023-01-23 01:32:05 +01:00
push r0
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
mov r0, system_invalid_op_str
Show the actual rip value in the monitor when an exception occurs
2023-01-23 01:32:05 +01:00
call debug_print
call print_string_to_monitor
pop r0
jmp system_breakpoint_handler
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_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:
Show the actual rip value in the monitor when an exception occurs
2023-01-23 01:32:05 +01:00
push r0
Add default page fault exception handler, bump version to 0.3.3
2022-08-16 02:32:50 +02:00
mov r0, system_page_fault_str
Show the actual rip value in the monitor when an exception occurs
2023-01-23 01:32:05 +01:00
call debug_print
call print_string_to_monitor
pop r0
Add default page fault exception handler, bump version to 0.3.3
2022-08-16 02:32:50 +02:00
pop r1
Show the actual rip value in the monitor when an exception occurs
2023-01-23 01:32:05 +01:00
jmp system_breakpoint_handler
Add default page fault exception handler, bump version to 0.3.3
2022-08-16 02:32:50 +02:00
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
Refactor system_breakpoint_handler Modifies system_breakpoint_handler so that all fox32 registers are saved on the stack in a predictable order, and they are printed using a loop. Also comments out two seemingly unneccessary additions in the monitor's hex printing functions.
2023-12-22 21:05:02 +01:00
; ensure the stack has at least 128 bytes of free space before triggering this exception!!
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
Refactor system_breakpoint_handler Modifies system_breakpoint_handler so that all fox32 registers are saved on the stack in a predictable order, and they are printed using a loop. Also comments out two seemingly unneccessary additions in the monitor's hex printing functions.
2023-12-22 21:05:02 +01:00
push rfp
push resp
push rsp
Add a cool register dump thing to the breakpoint exception handler
2022-10-28 04:10:03 +02:00
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
Refactor system_breakpoint_handler Modifies system_breakpoint_handler so that all fox32 registers are saved on the stack in a predictable order, and they are printed using a loop. Also comments out two seemingly unneccessary additions in the monitor's hex printing functions.
2023-12-22 21:05:02 +01:00
; modify the saved rsp value to reflect the value of rsp before the
; interrupt occured
; resp (4) + rfp (4) + flags (1) + return address (4) = 13 bytes
add [rsp+128], 13
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
Refactor system_breakpoint_handler Modifies system_breakpoint_handler so that all fox32 registers are saved on the stack in a predictable order, and they are printed using a loop. Also comments out two seemingly unneccessary additions in the monitor's hex printing functions.
2023-12-22 21:05:02 +01:00
; print breakpoint message
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
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
Refactor system_breakpoint_handler Modifies system_breakpoint_handler so that all fox32 registers are saved on the stack in a predictable order, and they are printed using a loop. Also comments out two seemingly unneccessary additions in the monitor's hex printing functions.
2023-12-22 21:05:02 +01:00
; print the display containing all of the registers
; r1 - used to store a pointer to the current string
; r2 - stores the current address on the stack
; r3 - loop counter
mov r1, system_breakpoint_r0_str
mov r2, rsp
mov r3, 0
system_breakpoint_print_loop:
; print the register label
mov r0, r1
call print_string_to_monitor
; print the register value
mov r0, [r2]
call print_hex_word_to_monitor
; adjust string pointer, stack address, and loop counter
add r1, SYSTEM_BREAKPOINT_R_STR_SIZE
inc r2, 4
inc r3
; decide whether to print a separator or a newline by checking if the loop
; counter is a multiple of 4
mov r0, r3
and r0, 0x03
ifnz jmp system_breakpoint_print_sep
system_breakpoint_print_newline:
Add a cool register dump thing to the breakpoint exception handler
2022-10-28 04:10:03 +02:00
mov r0, 10
Refactor system_breakpoint_handler Modifies system_breakpoint_handler so that all fox32 registers are saved on the stack in a predictable order, and they are printed using a loop. Also comments out two seemingly unneccessary additions in the monitor's hex printing functions.
2023-12-22 21:05:02 +01:00
jmp system_breakpoint_print_last_char
system_breakpoint_print_sep:
Add a cool register dump thing to the breakpoint exception handler
2022-10-28 04:10:03 +02:00
mov r0, ' '
call print_character_to_monitor
mov r0, '|'
call print_character_to_monitor
mov r0, ' '
Refactor system_breakpoint_handler Modifies system_breakpoint_handler so that all fox32 registers are saved on the stack in a predictable order, and they are printed using a loop. Also comments out two seemingly unneccessary additions in the monitor's hex printing functions.
2023-12-22 21:05:02 +01:00
system_breakpoint_print_last_char:
Add a cool register dump thing to the breakpoint exception handler
2022-10-28 04:10:03 +02:00
call print_character_to_monitor
Refactor system_breakpoint_handler Modifies system_breakpoint_handler so that all fox32 registers are saved on the stack in a predictable order, and they are printed using a loop. Also comments out two seemingly unneccessary additions in the monitor's hex printing functions.
2023-12-22 21:05:02 +01:00
; loop again if not on last register
cmp r3, 35
iflt jmp system_breakpoint_print_loop
; print rip
Show rsp and rip in the `brk` register dump
2022-11-13 06:02:32 +01:00
mov r0, system_breakpoint_rip_str
call print_string_to_monitor
Refactor system_breakpoint_handler Modifies system_breakpoint_handler so that all fox32 registers are saved on the stack in a predictable order, and they are printed using a loop. Also comments out two seemingly unneccessary additions in the monitor's hex printing functions.
2023-12-22 21:05:02 +01:00
mov r0, [r2+1]
Show rsp and rip in the `brk` register dump
2022-11-13 06:02:32 +01:00
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
Refactor system_breakpoint_handler Modifies system_breakpoint_handler so that all fox32 registers are saved on the stack in a predictable order, and they are printed using a loop. Also comments out two seemingly unneccessary additions in the monitor's hex printing functions.
2023-12-22 21:05:02 +01:00
; don't restore rsp and resp. not sure whether restoring a potentially
; modified resp would break things, but changing rsp definitely would.
add rsp, 8
pop rfp
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
Refactor system_breakpoint_handler Modifies system_breakpoint_handler so that all fox32 registers are saved on the stack in a predictable order, and they are printed using a loop. Also comments out two seemingly unneccessary additions in the monitor's hex printing functions.
2023-12-22 21:05:02 +01:00
const SYSTEM_BREAKPOINT_R_STR_SIZE: 7
system_breakpoint_r0_str: data.strz "r0: "
system_breakpoint_r1_str: data.strz "r1: "
system_breakpoint_r2_str: data.strz "r2: "
system_breakpoint_r3_str: data.strz "r3: "
system_breakpoint_r4_str: data.strz "r4: "
system_breakpoint_r5_str: data.strz "r5: "
system_breakpoint_r6_str: data.strz "r6: "
system_breakpoint_r7_str: data.strz "r7: "
system_breakpoint_r8_str: data.strz "r8: "
system_breakpoint_r9_str: data.strz "r9: "
system_breakpoint_r10_str: data.strz "r10: "
system_breakpoint_r11_str: data.strz "r11: "
system_breakpoint_r12_str: data.strz "r12: "
system_breakpoint_r13_str: data.strz "r13: "
system_breakpoint_r14_str: data.strz "r14: "
system_breakpoint_r15_str: data.strz "r15: "
system_breakpoint_r16_str: data.strz "r16: "
system_breakpoint_r17_str: data.strz "r17: "
system_breakpoint_r18_str: data.strz "r18: "
system_breakpoint_r19_str: data.strz "r19: "
system_breakpoint_r20_str: data.strz "r20: "
system_breakpoint_r21_str: data.strz "r21: "
system_breakpoint_r22_str: data.strz "r22: "
system_breakpoint_r23_str: data.strz "r23: "
system_breakpoint_r24_str: data.strz "r24: "
system_breakpoint_r25_str: data.strz "r25: "
system_breakpoint_r26_str: data.strz "r26: "
system_breakpoint_r27_str: data.strz "r27: "
system_breakpoint_r28_str: data.strz "r28: "
system_breakpoint_r29_str: data.strz "r29: "
system_breakpoint_r30_str: data.strz "r30: "
system_breakpoint_r31_str: data.strz "r31: "
system_breakpoint_rsp_str: data.strz "rsp: "
system_breakpoint_resp_str: data.strz "resp: "
system_breakpoint_rfp_str: data.strz "rfp: "
system_breakpoint_rip_str: data.strz "rip: "
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