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228 lines
5.1 KiB
228 lines
5.1 KiB
2 years ago
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.include "instr.inc"
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.text
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.global _start
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_start:
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# Set up the stack
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ld_sp mem_stack
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copr_random
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str_r0 mem_stack_tail
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str_r0 mem_stack_cookie
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copr_random
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str_r0 mem_stack_tail + 2
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str_r0 mem_stack_cookie + 2
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# Prompt for username
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ld_r2 str_login
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call PrintStr
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ld_r2 mem_username
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ld_r3 15
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call ReadStr
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ld_r2 mem_username
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call StrTrim
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call main
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ld_r2 str_done
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call PrintStr
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copr_halt
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die:
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jp die
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main:
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# Welcome the user
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ld_r2 str_welcome
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call PrintStr
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ld_r2 mem_username
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call PrintStr
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ld_r2 str_welcome2
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call PrintStr
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# Process input
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ld_r2 mem_input
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call input_read
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ldrb_r0 mem_input
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cp_r0 'Q'
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jp_eq main_end
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cp_r0 'q'
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jp_eq main_end
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ldrb_r0 mem_input + 1
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cp_r0 '\n'
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jp_eq main_print_info
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cp_r0 0
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jp_eq main_print_info
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jp main_wrong_input
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main_print_info:
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# Get info index
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ldrb_r3 mem_input
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add_r3 -'0'
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cp_r3 3
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jp_lo main_wrong_input
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# Print the correct string
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add_r3_r3
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add_r3 mem_info_strings
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ldr_r2_r3
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call PrintStr
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jp main
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main_wrong_input:
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ld_r2 str_wrong_input
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call PrintStr
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ld_r3 0x1000
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jp main
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main_end:
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# Check for stack smash
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ldr_r0 mem_stack_cookie
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ldr_r1 mem_stack_tail
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cp_r0_r1
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jp_ne stack_smash_halt
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ldr_r0 mem_stack_cookie + 2
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ldr_r1 mem_stack_tail + 2
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cp_r0_r1
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jp_ne stack_smash_halt
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ret
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input_read:
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# Store the byte
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copr_getc
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strb_r0_r2
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# Treat newline as delimiter
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cp_r0 '\n'
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jp_eq input_read_end
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# Don't increment if ran out of space
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cp_r3 0
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jp_eq input_read_skip
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inc_r2
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dec_r3
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input_read_skip:
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jp input_read
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input_read_end:
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# Terminate the string
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inc_r2
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ld_r0 0
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strb_r0_r2
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# Check for stack smash
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ldr_r0 mem_stack_cookie
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ldr_r1 mem_stack_tail
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cp_r0_r1
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jp_ne stack_smash_halt
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ldr_r0 mem_stack_cookie + 2
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ldr_r1 mem_stack_tail + 2
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cp_r0_r1
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jp_ne stack_smash_halt
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ret
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stack_smash_halt:
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ld_r2 str_stack_smashing_detected
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call PrintStr
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copr_halt
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str_stack_smashing_detected:
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.ascii "*** stack smashing detected *** "
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text_ram_byte 0xfe00
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text_ram_byte 0xfe01
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text_ram_byte 0xfe02
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text_ram_byte 0xfe03
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.ascii " != "
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text_ram_byte 0xf74f
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text_ram_byte 0xf750
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text_ram_byte 0xf751
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text_ram_byte 0xf752
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.ascii " - halted\n\0"
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str_login:
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.ascii "Welcome to Glitch Research Lab Information Server (GRLINFSRV)\n"
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.ascii "Enter your name for our records (max 15 characters): \0"
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str_welcome:
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.ascii "\n"
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.ascii "-----\n"
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.ascii "\n"
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.ascii "Welcome, \0"
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str_welcome2:
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.ascii "!\n"
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.ascii "\n"
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.ascii "Selection of topics:\n"
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.ascii "(1) About the Glitch Research Laboratory\n"
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.ascii "(2) About the GLVM test servers\n"
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.ascii "(3) About the Fight Simulation Program\n"
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.ascii "\n"
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.ascii "Enter the number of the topic you wish to view, or 'q' to leave: \0"
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str_done:
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.ascii "Thank you. Have a nice day!\n\0"
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mem_info_strings:
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.2byte str_wrong_input
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.2byte str_info_1
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.2byte str_info_2
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.2byte str_info_3
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str_wrong_input:
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.ascii "Please type 1, 2 or 3, dummy!\n\0"
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str_info_1:
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.ascii "\n"
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.ascii "-----\n"
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.ascii "\n"
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.ascii "Glitch Research Laboratory is the leading glitchology research\n"
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.ascii "facility in all of Glitch Islands. We specialize in research of\n"
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.ascii "various glitch phenomena existing in Glitch Islands and in all of\n"
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.ascii "the surrounding areas.\n"
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.ascii "\0"
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str_info_2:
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.ascii "\n"
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.ascii "-----\n"
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.ascii "\n"
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.ascii "GLVM is our innovative, new machine architecture, designed to bring\n"
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.ascii "the ease of Z80 assembly programming to the modern world.\n"
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.ascii "The simplified instruction set of the GLVM enhances productivity\n"
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.ascii "of our employees and significantly speeds up development of software\n"
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.ascii "required for our research.\n"
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.ascii "Work on the GLVM architecture is still ongoing, and all implementation\n"
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.ascii "details are strictly confidential, until further notice.\n"
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.ascii "\0"
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str_info_3:
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.ascii "\n"
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.ascii "-----\n"
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.ascii "\n"
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.ascii "Fight Simulation Program is the current ongoing project of Glitch\n"
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.ascii "Research Laboratory. It allows for examination of behavior of\n"
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.ascii "malicious glitch actors, such as Missingno., without running the risk\n"
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.ascii "of prolonged exposure to glitches or corruption.\n"
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.ascii "Participants are able to fight against opponents in an isolated\n"
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.ascii "environment, similar to typical turn-based strategy games.\n"
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.ascii "The program is still in development, and as such, all details are\n"
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.ascii "strictly confidential.\n"
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.ascii "\0"
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.ascii "FOOLS2023_{DoesThisCountAsFormatString}\n\0"
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mem_username:
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.ascii "________________"
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mem_stack_cookie:
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.fill 4, 1, 0
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mem_input:
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.ascii "________"
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.fill 0x6a5, 1, 0
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mem_stack_tail:
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.fill 0x100, 1, 0
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mem_stack:
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.fill 0x100, 1, 0
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