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labs/06
| Author | SHA1 | Date | |
|---|---|---|---|
| b559db2cc1 | |||
| 8fe6e0ba63 | |||
| f57aa67887 | |||
| eb85d6dd9a | |||
| 68c5f8388b | |||
| 0fff8ca9d1 | |||
| a2ac5eedcc |
@ -2,3 +2,12 @@
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## Подпрограммы, программные прерывания и особые случаи
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### АХТУНГ
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**НАСТОЯТЕЛЬНО РЕКОМЕНДУЮ НЕ ЗАГРУЖАТЬ КОД ИЗ ЭТОЙ ЛАБЫ**. Дело в том, что Linux считает прерывания его личной заботой и поэтому как правило сам отвечает за их обработку. Для того, чтобы сделать прикол из лабы с подменой таблицы векоторов прерываний необходимо написать модуль ядра.
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Для тех, кто в танке, это означает следующее: **ЕСЛИ Я ОШИБСЯ ХОТЬ ГДЕ-ТО (А Я ВЕРОЯТНЕЕ ВСЕГО ГДЕ-ТО ОШИБСЯ), ВАШЕЙ СИСТЕМЕ МОЖЕТ ПРИЙТИ ПИЗДА. И ОЧЕНЬ БЫСТРО**
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## Теперь для смелых
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Милицын препод лояльный, поэтому было принято решение не грохать в лоб системную таблицу, а расширить ее своими прерываниями. Делается это в основном при помощи `request_irq`, в который передается куча инфы о прерывании
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69
06-subroutines-interruptions/fuck-system.c
Normal file
69
06-subroutines-interruptions/fuck-system.c
Normal file
@ -0,0 +1,69 @@
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <asm/desc.h>
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// Смотрим у производителя процессора номер прерывания
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// деления на ноль (я сижу на x86-64, а этот номер зависит от архитектуры процессора)
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#define ZERODIV_NR 0x00
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extern void store_idt(struct desc_ptr *storage);
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static void example_handler(void)
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{
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pr_warn("entered the handler");
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return;
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}
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static int __init fuck_system(void)
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{
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pr_info("start to fuck system");
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struct desc_ptr newidtreg;
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struct desc_ptr oldidtreg;
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gate_desc *oldidt, *newidt;
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pr_info("nessesary variables created");
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// Выделяем память под 256 прерываний
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unsigned long new_page = __get_free_page(GFP_KERNEL);
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if (!new_page)
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{
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return -ENOMEM;
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}
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pr_info("new page allocated");
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store_idt(&oldidtreg);
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pr_info("IDT register stored");
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newidtreg.address = new_page;
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newidtreg.size = oldidtreg.size;
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newidt = (gate_desc *)newidtreg.address;
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memcpy(newidt, oldidt, newidtreg.size);
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pr_info("IDT register saved in backup");
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pack_gate(
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(newidt + ZERODIV_NR),
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GATE_INTERRUPT,
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(unsigned long) example_handler,
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0,
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0,
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__KERNEL_CS
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);
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pr_info("packed new gate");
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load_idt(&newidtreg);
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pr_info("loaded new interrupts");
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int x = 1 / 0; // триггерим прерывание деления на ноль
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pr_info("return from interrupt");
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load_idt(&oldidtreg);
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free_page(new_page);
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pr_info("Unloaded everything");
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return 0;
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}
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static void __exit unfuck_system(void)
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{
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pr_info("start to unfuck system");
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}
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module_init(fuck_system);
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module_exit(unfuck_system);
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MODULE_LICENSE("GPL");
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8
06-subroutines-interruptions/low-level-asm.asm
Normal file
8
06-subroutines-interruptions/low-level-asm.asm
Normal file
@ -0,0 +1,8 @@
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global store_idt
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section .text
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store_idt: ; rdi - указатель
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sidt [rdi]
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ret
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int3
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@ -1,397 +0,0 @@
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global _start
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%define NAME_SIZE 64
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%define BUFF_SIZE 1024
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section .bss
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name resb NAME_SIZE
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buffer resb BUFF_SIZE
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section .data
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buffer_tail dq buffer
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iseof db 0
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;strings
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E_open_file db `Something went wrong while opening file\n`
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section .text
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namecmp:
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.LFB6:
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push rbp
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mov rbp, rsp
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mov QWORD -8[rbp], rdi
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mov QWORD -16[rbp], rsi
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jmp .L2
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.L6:
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mov rax, QWORD -8[rbp]
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movzx edx, BYTE [rax]
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mov rax, QWORD -16[rbp]
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movzx eax, BYTE [rax]
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cmp dl, al
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je .L3
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mov eax, 0
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jmp .L4
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.L3:
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add QWORD -8[rbp], 1
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add QWORD -16[rbp], 1
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.L2:
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mov rax, QWORD -8[rbp]
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movzx eax, BYTE [rax]
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test al, al
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je .L5
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mov rax, QWORD -16[rbp]
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movzx eax, BYTE [rax]
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test al, al
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jne .L6
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.L5:
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mov eax, 1
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.L4:
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pop rbp
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ret
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openfile:
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.LFB7:
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push rbp
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mov rbp, rsp
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sub rsp, 32
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mov -24[rbp], rdi
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mov rax, -24[rbp]
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mov esi, 0
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mov rdi, rax
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mov eax, 0
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call open@PLT
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mov -4[rbp], eax
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cmp -4[rbp], 0
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jns .L8
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;lea rax, .LC0[rip]
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mov rax, E_open_file
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mov rdi, rax
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call puts@PLT
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mov edi, 1
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call exit@PLT
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.L8:
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mov eax, DWORD -4[rbp]
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leave
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ret
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fill_buffer:
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push rbp
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mov rbp, rsp
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sub rsp, 32
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mov DWORD -20[rbp], edi
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mov rdx, QWORD buffer_tail[rip]
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lea rax, buffer[rip]
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sub rdx, rax
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mov eax, 1024
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sub rax, rdx
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mov QWORD -8[rbp], rax
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mov rdx, QWORD -8[rbp]
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mov eax, DWORD -20[rbp]
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lea rcx, buffer[rip]
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mov rsi, rcx
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mov edi, eax
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call read@PLT
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mov QWORD -16[rbp], rax
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cmp QWORD -16[rbp], 1023
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ja .L11
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mov BYTE iseof[rip], 1
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.L11:
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lea rdx, buffer[rip]
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mov rax, QWORD -16[rbp]
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add rax, rdx
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mov QWORD buffer_tail[rip], rax
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nop
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leave
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ret
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find_second_word:
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push rbp
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mov rbp, rsp
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mov QWORD -8[rbp], rdi
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jmp .L13
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.L14:
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add QWORD -8[rbp], 1
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.L13:
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mov rax, QWORD -8[rbp]
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movzx eax, BYTE [rax]
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cmp al, 32
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jne .L14
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add QWORD -8[rbp], 1
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mov rax, QWORD -8[rbp]
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pop rbp
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ret
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find_fullname_end:
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push rbp
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mov rbp, rsp
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lea rax, buffer[rip]
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mov QWORD -8[rbp], rax
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jmp .L17
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.L20:
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add QWORD -8[rbp], 1
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.L17:
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mov rax, QWORD -8[rbp]
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movzx eax, BYTE [rax]
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cmp al, 10
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jne .L18
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mov rax, QWORD -8[rbp]
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movzx eax, BYTE [rax]
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test al, al
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jne .L19
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.L18:
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lea rax, buffer[rip+1024]
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cmp QWORD -8[rbp], rax
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jb .L20
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.L19:
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lea rax, buffer[rip+1024]
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cmp QWORD -8[rbp], rax
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jne .L21
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mov eax, 0
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jmp .L22
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.L21:
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mov rax, QWORD -8[rbp]
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.L22:
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pop rbp
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ret
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.LFE10:
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.size find_fullname_end, .-find_fullname_end
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.globl pop_fullname
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.type pop_fullname, @function
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pop_fullname:
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.LFB11:
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push rbp
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mov rbp, rsp
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sub rsp, 32
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mov eax, 0
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call find_fullname_end
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add rax, 1
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mov QWORD -16[rbp], rax
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lea rdx, buffer[rip]
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mov rax, QWORD -16[rbp]
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sub rax, rdx
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mov QWORD -24[rbp], rax
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mov QWORD -8[rbp], 0
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jmp .L24
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.L25:
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mov rdx, QWORD -16[rbp]
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mov rax, QWORD -8[rbp]
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add rax, rdx
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movzx eax, BYTE [rax]
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lea rcx, buffer[rip]
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mov rdx, QWORD -8[rbp]
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add rdx, rcx
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mov BYTE [rdx], al
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mov rdx, QWORD -16[rbp]
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mov rax, QWORD -8[rbp]
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add rax, rdx
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mov BYTE [rax], 0
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add QWORD -8[rbp], 1
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.L24:
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mov eax, 1024
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sub rax, QWORD -24[rbp]
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cmp QWORD -8[rbp], rax
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jb .L25
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mov rax, QWORD buffer_tail[rip]
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mov rdx, QWORD -24[rbp]
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neg rdx
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add rax, rdx
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mov QWORD buffer_tail[rip], rax
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nop
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leave
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ret
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.LFE11:
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.size pop_fullname, .-pop_fullname
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.section .rodata
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.LC1:
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.string "count: "
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.LC2:
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.string "\n"
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.text
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.globl print_count
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.type print_count, @function
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print_count:
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.LFB12:
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push rbp
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mov rbp, rsp
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sub rsp, 32
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mov QWORD -24[rbp], rdi
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mov edx, 8
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lea rax, .LC1[rip]
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mov rsi, rax
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mov edi, 1
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call write@PLT
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jmp .L27
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.L28:
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mov rcx, QWORD -24[rbp]
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movabs rdx, -3689348814741910323
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mov rax, rcx
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mul rdx
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shr rdx, 3
|
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mov rax, rdx
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sal rax, 2
|
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add rax, rdx
|
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add rax, rax
|
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sub rcx, rax
|
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mov rdx, rcx
|
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mov eax, edx
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add eax, 48
|
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mov BYTE -1[rbp], al
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mov rax, QWORD -24[rbp]
|
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movabs rdx, -3689348814741910323
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mul rdx
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mov rax, rdx
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shr rax, 3
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mov QWORD -24[rbp], rax
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lea rax, -1[rbp]
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mov edx, 1
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mov rsi, rax
|
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mov edi, 1
|
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call write@PLT
|
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.L27:
|
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cmp QWORD -24[rbp], 0
|
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jne .L28
|
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mov edx, 1
|
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lea rax, .LC2[rip]
|
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mov rsi, rax
|
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mov edi, 1
|
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call write@PLT
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nop
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leave
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|
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ret
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|
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.LFE12:
|
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.size print_count, .-print_count
|
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.globl get_name
|
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.type get_name, @function
|
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get_name:
|
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.LFB13:
|
||||
|
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push rbp
|
||||
|
||||
|
||||
mov rbp, rsp
|
||||
|
||||
sub rsp, 40
|
||||
mov QWORD -40[rbp], rdi
|
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lea rax, buffer[rip]
|
||||
mov rdi, rax
|
||||
call find_second_word
|
||||
mov QWORD -24[rbp], rax
|
||||
mov rax, QWORD -24[rbp]
|
||||
mov QWORD -8[rbp], rax
|
||||
jmp .L30
|
||||
.L31:
|
||||
add QWORD -8[rbp], 1
|
||||
.L30:
|
||||
mov rax, QWORD -8[rbp]
|
||||
movzx eax, BYTE [rax]
|
||||
cmp al, 32
|
||||
jne .L31
|
||||
cmp QWORD -8[rbp], 0
|
||||
jne .L32
|
||||
mov eax, -1
|
||||
jmp .L33
|
||||
.L32:
|
||||
mov QWORD -16[rbp], 0
|
||||
jmp .L34
|
||||
.L35:
|
||||
mov rdx, QWORD -24[rbp]
|
||||
mov rax, QWORD -16[rbp]
|
||||
add rax, rdx
|
||||
mov rcx, QWORD -40[rbp]
|
||||
mov rdx, QWORD -16[rbp]
|
||||
add rdx, rcx
|
||||
movzx eax, BYTE [rax]
|
||||
mov BYTE [rdx], al
|
||||
add QWORD -16[rbp], 1
|
||||
.L34:
|
||||
mov rdx, QWORD -24[rbp]
|
||||
mov rax, QWORD -16[rbp]
|
||||
add rax, rdx
|
||||
cmp rax, QWORD -8[rbp]
|
||||
jb .L35
|
||||
mov eax, 0
|
||||
.L33:
|
||||
leave
|
||||
|
||||
ret
|
||||
|
||||
.LFE13:
|
||||
.size get_name, .-get_name
|
||||
.globl main
|
||||
.type main, @function
|
||||
main:
|
||||
.LFB14:
|
||||
push rbp
|
||||
mov rbp, rsp
|
||||
sub rsp, 96
|
||||
mov DWORD -84[rbp], edi
|
||||
mov QWORD -96[rbp], rsi
|
||||
mov rax, QWORD -96[rbp]
|
||||
add rax, 8
|
||||
mov rax, QWORD [rax]
|
||||
mov rdi, rax
|
||||
call openfile
|
||||
mov DWORD -12[rbp], eax
|
||||
mov edx, 64
|
||||
lea rax, name[rip]
|
||||
mov rsi, rax
|
||||
mov edi, 0
|
||||
call read@PLT
|
||||
mov QWORD -8[rbp], 0
|
||||
mov QWORD -80[rbp], 0
|
||||
mov QWORD -72[rbp], 0
|
||||
mov QWORD -64[rbp], 0
|
||||
mov QWORD -56[rbp], 0
|
||||
mov QWORD -48[rbp], 0
|
||||
mov QWORD -40[rbp], 0
|
||||
mov QWORD -32[rbp], 0
|
||||
mov QWORD -24[rbp], 0
|
||||
.L39:
|
||||
mov eax, 0
|
||||
call find_fullname_end
|
||||
test rax, rax
|
||||
jne .L37
|
||||
mov eax, DWORD -12[rbp]
|
||||
mov edi, eax
|
||||
call fill_buffer
|
||||
.L37:
|
||||
lea rax, -80[rbp]
|
||||
mov rdi, rax
|
||||
call get_name
|
||||
lea rax, -80[rbp]
|
||||
lea rdx, name[rip]
|
||||
mov rsi, rdx
|
||||
mov rdi, rax
|
||||
call namecmp
|
||||
test eax, eax
|
||||
je .L38
|
||||
add QWORD -8[rbp], 1
|
||||
.L38:
|
||||
mov eax, 0
|
||||
call pop_fullname
|
||||
mov rdx, QWORD buffer_tail[rip]
|
||||
lea rax, buffer[rip]
|
||||
cmp rdx, rax
|
||||
jne .L39
|
||||
mov rax, QWORD -8[rbp]
|
||||
mov rdi, rax
|
||||
call print_count
|
||||
mov eax, 0
|
||||
leave
|
||||
ret
|
||||
@ -1,134 +0,0 @@
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <fcntl.h>
|
||||
|
||||
#define BUFF_SIZE 1024
|
||||
#define NAME_SIZE 64
|
||||
#define STDIN 0
|
||||
#define STDOUT 1
|
||||
|
||||
typedef unsigned long long u64;
|
||||
|
||||
char name[NAME_SIZE];
|
||||
char buffer[BUFF_SIZE];
|
||||
char* buffer_tail = buffer; // points on first free symbol
|
||||
|
||||
char iseof = 0;
|
||||
|
||||
int namecmp(char* name1, char* name2)
|
||||
{
|
||||
for (; *name1 && *name2; name1++, name2++)
|
||||
{
|
||||
if (*name1 != *name2)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
int openfile(char* filename)
|
||||
{
|
||||
int file = open(filename, O_RDONLY);
|
||||
if (file < 0)
|
||||
{
|
||||
puts("Something went wrong while opening file\n");
|
||||
exit(1);
|
||||
}
|
||||
return file;
|
||||
}
|
||||
|
||||
void fill_buffer(int filedesc)
|
||||
{
|
||||
const size_t tofill = BUFF_SIZE - (buffer_tail - buffer);
|
||||
u64 bytes_read = read(filedesc, buffer, tofill);
|
||||
if (bytes_read < BUFF_SIZE)
|
||||
{
|
||||
iseof = 1;
|
||||
}
|
||||
buffer_tail = buffer + bytes_read;
|
||||
}
|
||||
|
||||
char* find_second_word(char* start)
|
||||
{
|
||||
for (; *start != ' '; start++);
|
||||
return ++start;
|
||||
}
|
||||
|
||||
char* find_fullname_end()
|
||||
{
|
||||
char* end = buffer;
|
||||
for (; (*end != '\n' || *end == 0)
|
||||
&& end < buffer + BUFF_SIZE; end++);
|
||||
if (end == buffer + BUFF_SIZE)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
return end;
|
||||
}
|
||||
|
||||
void pop_fullname() // pops from buffer
|
||||
{
|
||||
char* end = find_fullname_end() + 1;
|
||||
u64 fullname_len = end - buffer;
|
||||
size_t i = 0;
|
||||
for (; i < BUFF_SIZE - fullname_len; i++)
|
||||
{
|
||||
buffer[i] = end[i];
|
||||
end[i] = 0;
|
||||
}
|
||||
buffer_tail -= fullname_len;
|
||||
}
|
||||
|
||||
void print_count(u64 count)
|
||||
{
|
||||
write(STDOUT, "count: ", 8);
|
||||
while (count)
|
||||
{
|
||||
char digit = (count % 10) + '0';
|
||||
count /= 10;
|
||||
write(STDOUT, &digit, 1);
|
||||
}
|
||||
write(STDOUT, "\n", 1);
|
||||
}
|
||||
|
||||
int get_name(char* accumulator)
|
||||
{
|
||||
char* start = find_second_word(buffer);
|
||||
char* end = start;
|
||||
for (; *end != ' '; end++);
|
||||
if (!end)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
for (size_t i = 0; &start[i] < end; i++)
|
||||
{
|
||||
accumulator[i] = start[i];
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int main(int argc, char* argv[])
|
||||
{
|
||||
int filedesc = openfile(argv[1]);
|
||||
read(STDIN, name, sizeof(name)/sizeof(name[0]));
|
||||
// fgets(name, sizeof(name)/sizeof(name[0]), stdin);
|
||||
size_t count = 0;
|
||||
char namebuff[NAME_SIZE] = {0, };
|
||||
do
|
||||
{
|
||||
if (!find_fullname_end())
|
||||
{
|
||||
fill_buffer(filedesc);
|
||||
}
|
||||
get_name(namebuff);
|
||||
if (namecmp(namebuff, name))
|
||||
{
|
||||
count++;
|
||||
}
|
||||
pop_fullname();
|
||||
} while (buffer_tail != buffer);
|
||||
print_count(count);
|
||||
return 0;
|
||||
}
|
||||
@ -1,467 +0,0 @@
|
||||
.file "main.c"
|
||||
.intel_syntax noprefix
|
||||
.text
|
||||
.globl name
|
||||
.bss
|
||||
.align 32
|
||||
.type name, @object
|
||||
.size name, 64
|
||||
name:
|
||||
.zero 64
|
||||
.globl buffer
|
||||
.align 32
|
||||
.type buffer, @object
|
||||
.size buffer, 1024
|
||||
buffer:
|
||||
.zero 1024
|
||||
.globl buffer_tail
|
||||
.section .data.rel.local,"aw"
|
||||
.align 8
|
||||
.type buffer_tail, @object
|
||||
.size buffer_tail, 8
|
||||
buffer_tail:
|
||||
.quad buffer
|
||||
.globl iseof
|
||||
.bss
|
||||
.type iseof, @object
|
||||
.size iseof, 1
|
||||
iseof:
|
||||
.zero 1
|
||||
.text
|
||||
.globl namecmp
|
||||
.type namecmp, @function
|
||||
namecmp:
|
||||
.LFB6:
|
||||
.cfi_startproc
|
||||
push rbp
|
||||
.cfi_def_cfa_offset 16
|
||||
.cfi_offset 6, -16
|
||||
mov rbp, rsp
|
||||
.cfi_def_cfa_register 6
|
||||
mov QWORD PTR -8[rbp], rdi
|
||||
mov QWORD PTR -16[rbp], rsi
|
||||
jmp .L2
|
||||
.L6:
|
||||
mov rax, QWORD PTR -8[rbp]
|
||||
movzx edx, BYTE PTR [rax]
|
||||
mov rax, QWORD PTR -16[rbp]
|
||||
movzx eax, BYTE PTR [rax]
|
||||
cmp dl, al
|
||||
je .L3
|
||||
mov eax, 0
|
||||
jmp .L4
|
||||
.L3:
|
||||
add QWORD PTR -8[rbp], 1
|
||||
add QWORD PTR -16[rbp], 1
|
||||
.L2:
|
||||
mov rax, QWORD PTR -8[rbp]
|
||||
movzx eax, BYTE PTR [rax]
|
||||
test al, al
|
||||
je .L5
|
||||
mov rax, QWORD PTR -16[rbp]
|
||||
movzx eax, BYTE PTR [rax]
|
||||
test al, al
|
||||
jne .L6
|
||||
.L5:
|
||||
mov eax, 1
|
||||
.L4:
|
||||
pop rbp
|
||||
.cfi_def_cfa 7, 8
|
||||
ret
|
||||
.cfi_endproc
|
||||
.LFE6:
|
||||
.size namecmp, .-namecmp
|
||||
.section .rodata
|
||||
.align 8
|
||||
.LC0:
|
||||
.string "Something went wrong while opening file\n"
|
||||
.text
|
||||
.globl openfile
|
||||
.type openfile, @function
|
||||
openfile:
|
||||
.LFB7:
|
||||
.cfi_startproc
|
||||
push rbp
|
||||
.cfi_def_cfa_offset 16
|
||||
.cfi_offset 6, -16
|
||||
mov rbp, rsp
|
||||
.cfi_def_cfa_register 6
|
||||
sub rsp, 32
|
||||
mov QWORD PTR -24[rbp], rdi
|
||||
mov rax, QWORD PTR -24[rbp]
|
||||
mov esi, 0
|
||||
mov rdi, rax
|
||||
mov eax, 0
|
||||
call open@PLT
|
||||
mov DWORD PTR -4[rbp], eax
|
||||
cmp DWORD PTR -4[rbp], 0
|
||||
jns .L8
|
||||
lea rax, .LC0[rip]
|
||||
mov rdi, rax
|
||||
call puts@PLT
|
||||
mov edi, 1
|
||||
call exit@PLT
|
||||
.L8:
|
||||
mov eax, DWORD PTR -4[rbp]
|
||||
leave
|
||||
.cfi_def_cfa 7, 8
|
||||
ret
|
||||
.cfi_endproc
|
||||
.LFE7:
|
||||
.size openfile, .-openfile
|
||||
.globl fill_buffer
|
||||
.type fill_buffer, @function
|
||||
fill_buffer:
|
||||
.LFB8:
|
||||
.cfi_startproc
|
||||
push rbp
|
||||
.cfi_def_cfa_offset 16
|
||||
.cfi_offset 6, -16
|
||||
mov rbp, rsp
|
||||
.cfi_def_cfa_register 6
|
||||
sub rsp, 32
|
||||
mov DWORD PTR -20[rbp], edi
|
||||
mov rdx, QWORD PTR buffer_tail[rip]
|
||||
lea rax, buffer[rip]
|
||||
sub rdx, rax
|
||||
mov eax, 1024
|
||||
sub rax, rdx
|
||||
mov QWORD PTR -8[rbp], rax
|
||||
mov rdx, QWORD PTR -8[rbp]
|
||||
mov eax, DWORD PTR -20[rbp]
|
||||
lea rcx, buffer[rip]
|
||||
mov rsi, rcx
|
||||
mov edi, eax
|
||||
call read@PLT
|
||||
mov QWORD PTR -16[rbp], rax
|
||||
cmp QWORD PTR -16[rbp], 1023
|
||||
ja .L11
|
||||
mov BYTE PTR iseof[rip], 1
|
||||
.L11:
|
||||
lea rdx, buffer[rip]
|
||||
mov rax, QWORD PTR -16[rbp]
|
||||
add rax, rdx
|
||||
mov QWORD PTR buffer_tail[rip], rax
|
||||
nop
|
||||
leave
|
||||
.cfi_def_cfa 7, 8
|
||||
ret
|
||||
.cfi_endproc
|
||||
.LFE8:
|
||||
.size fill_buffer, .-fill_buffer
|
||||
.globl find_second_word
|
||||
.type find_second_word, @function
|
||||
find_second_word:
|
||||
.LFB9:
|
||||
.cfi_startproc
|
||||
push rbp
|
||||
.cfi_def_cfa_offset 16
|
||||
.cfi_offset 6, -16
|
||||
mov rbp, rsp
|
||||
.cfi_def_cfa_register 6
|
||||
mov QWORD PTR -8[rbp], rdi
|
||||
jmp .L13
|
||||
.L14:
|
||||
add QWORD PTR -8[rbp], 1
|
||||
.L13:
|
||||
mov rax, QWORD PTR -8[rbp]
|
||||
movzx eax, BYTE PTR [rax]
|
||||
cmp al, 32
|
||||
jne .L14
|
||||
add QWORD PTR -8[rbp], 1
|
||||
mov rax, QWORD PTR -8[rbp]
|
||||
pop rbp
|
||||
.cfi_def_cfa 7, 8
|
||||
ret
|
||||
.cfi_endproc
|
||||
.LFE9:
|
||||
.size find_second_word, .-find_second_word
|
||||
.globl find_fullname_end
|
||||
.type find_fullname_end, @function
|
||||
find_fullname_end:
|
||||
.LFB10:
|
||||
.cfi_startproc
|
||||
push rbp
|
||||
.cfi_def_cfa_offset 16
|
||||
.cfi_offset 6, -16
|
||||
mov rbp, rsp
|
||||
.cfi_def_cfa_register 6
|
||||
lea rax, buffer[rip]
|
||||
mov QWORD PTR -8[rbp], rax
|
||||
jmp .L17
|
||||
.L20:
|
||||
add QWORD PTR -8[rbp], 1
|
||||
.L17:
|
||||
mov rax, QWORD PTR -8[rbp]
|
||||
movzx eax, BYTE PTR [rax]
|
||||
cmp al, 10
|
||||
jne .L18
|
||||
mov rax, QWORD PTR -8[rbp]
|
||||
movzx eax, BYTE PTR [rax]
|
||||
test al, al
|
||||
jne .L19
|
||||
.L18:
|
||||
lea rax, buffer[rip+1024]
|
||||
cmp QWORD PTR -8[rbp], rax
|
||||
jb .L20
|
||||
.L19:
|
||||
lea rax, buffer[rip+1024]
|
||||
cmp QWORD PTR -8[rbp], rax
|
||||
jne .L21
|
||||
mov eax, 0
|
||||
jmp .L22
|
||||
.L21:
|
||||
mov rax, QWORD PTR -8[rbp]
|
||||
.L22:
|
||||
pop rbp
|
||||
.cfi_def_cfa 7, 8
|
||||
ret
|
||||
.cfi_endproc
|
||||
.LFE10:
|
||||
.size find_fullname_end, .-find_fullname_end
|
||||
.globl pop_fullname
|
||||
.type pop_fullname, @function
|
||||
pop_fullname:
|
||||
.LFB11:
|
||||
.cfi_startproc
|
||||
push rbp
|
||||
.cfi_def_cfa_offset 16
|
||||
.cfi_offset 6, -16
|
||||
mov rbp, rsp
|
||||
.cfi_def_cfa_register 6
|
||||
sub rsp, 32
|
||||
mov eax, 0
|
||||
call find_fullname_end
|
||||
add rax, 1
|
||||
mov QWORD PTR -16[rbp], rax
|
||||
lea rdx, buffer[rip]
|
||||
mov rax, QWORD PTR -16[rbp]
|
||||
sub rax, rdx
|
||||
mov QWORD PTR -24[rbp], rax
|
||||
mov QWORD PTR -8[rbp], 0
|
||||
jmp .L24
|
||||
.L25:
|
||||
mov rdx, QWORD PTR -16[rbp]
|
||||
mov rax, QWORD PTR -8[rbp]
|
||||
add rax, rdx
|
||||
movzx eax, BYTE PTR [rax]
|
||||
lea rcx, buffer[rip]
|
||||
mov rdx, QWORD PTR -8[rbp]
|
||||
add rdx, rcx
|
||||
mov BYTE PTR [rdx], al
|
||||
mov rdx, QWORD PTR -16[rbp]
|
||||
mov rax, QWORD PTR -8[rbp]
|
||||
add rax, rdx
|
||||
mov BYTE PTR [rax], 0
|
||||
add QWORD PTR -8[rbp], 1
|
||||
.L24:
|
||||
mov eax, 1024
|
||||
sub rax, QWORD PTR -24[rbp]
|
||||
cmp QWORD PTR -8[rbp], rax
|
||||
jb .L25
|
||||
mov rax, QWORD PTR buffer_tail[rip]
|
||||
mov rdx, QWORD PTR -24[rbp]
|
||||
neg rdx
|
||||
add rax, rdx
|
||||
mov QWORD PTR buffer_tail[rip], rax
|
||||
nop
|
||||
leave
|
||||
.cfi_def_cfa 7, 8
|
||||
ret
|
||||
.cfi_endproc
|
||||
.LFE11:
|
||||
.size pop_fullname, .-pop_fullname
|
||||
.section .rodata
|
||||
.LC1:
|
||||
.string "count: "
|
||||
.LC2:
|
||||
.string "\n"
|
||||
.text
|
||||
.globl print_count
|
||||
.type print_count, @function
|
||||
print_count:
|
||||
.LFB12:
|
||||
.cfi_startproc
|
||||
push rbp
|
||||
.cfi_def_cfa_offset 16
|
||||
.cfi_offset 6, -16
|
||||
mov rbp, rsp
|
||||
.cfi_def_cfa_register 6
|
||||
sub rsp, 32
|
||||
mov QWORD PTR -24[rbp], rdi
|
||||
mov edx, 8
|
||||
lea rax, .LC1[rip]
|
||||
mov rsi, rax
|
||||
mov edi, 1
|
||||
call write@PLT
|
||||
jmp .L27
|
||||
.L28:
|
||||
mov rcx, QWORD PTR -24[rbp]
|
||||
movabs rdx, -3689348814741910323
|
||||
mov rax, rcx
|
||||
mul rdx
|
||||
shr rdx, 3
|
||||
mov rax, rdx
|
||||
sal rax, 2
|
||||
add rax, rdx
|
||||
add rax, rax
|
||||
sub rcx, rax
|
||||
mov rdx, rcx
|
||||
mov eax, edx
|
||||
add eax, 48
|
||||
mov BYTE PTR -1[rbp], al
|
||||
mov rax, QWORD PTR -24[rbp]
|
||||
movabs rdx, -3689348814741910323
|
||||
mul rdx
|
||||
mov rax, rdx
|
||||
shr rax, 3
|
||||
mov QWORD PTR -24[rbp], rax
|
||||
lea rax, -1[rbp]
|
||||
mov edx, 1
|
||||
mov rsi, rax
|
||||
mov edi, 1
|
||||
call write@PLT
|
||||
.L27:
|
||||
cmp QWORD PTR -24[rbp], 0
|
||||
jne .L28
|
||||
mov edx, 1
|
||||
lea rax, .LC2[rip]
|
||||
mov rsi, rax
|
||||
mov edi, 1
|
||||
call write@PLT
|
||||
nop
|
||||
leave
|
||||
.cfi_def_cfa 7, 8
|
||||
ret
|
||||
.cfi_endproc
|
||||
.LFE12:
|
||||
.size print_count, .-print_count
|
||||
.globl get_name
|
||||
.type get_name, @function
|
||||
get_name:
|
||||
.LFB13:
|
||||
.cfi_startproc
|
||||
push rbp
|
||||
.cfi_def_cfa_offset 16
|
||||
.cfi_offset 6, -16
|
||||
mov rbp, rsp
|
||||
.cfi_def_cfa_register 6
|
||||
sub rsp, 40
|
||||
mov QWORD PTR -40[rbp], rdi
|
||||
lea rax, buffer[rip]
|
||||
mov rdi, rax
|
||||
call find_second_word
|
||||
mov QWORD PTR -24[rbp], rax
|
||||
mov rax, QWORD PTR -24[rbp]
|
||||
mov QWORD PTR -8[rbp], rax
|
||||
jmp .L30
|
||||
.L31:
|
||||
add QWORD PTR -8[rbp], 1
|
||||
.L30:
|
||||
mov rax, QWORD PTR -8[rbp]
|
||||
movzx eax, BYTE PTR [rax]
|
||||
cmp al, 32
|
||||
jne .L31
|
||||
cmp QWORD PTR -8[rbp], 0
|
||||
jne .L32
|
||||
mov eax, -1
|
||||
jmp .L33
|
||||
.L32:
|
||||
mov QWORD PTR -16[rbp], 0
|
||||
jmp .L34
|
||||
.L35:
|
||||
mov rdx, QWORD PTR -24[rbp]
|
||||
mov rax, QWORD PTR -16[rbp]
|
||||
add rax, rdx
|
||||
mov rcx, QWORD PTR -40[rbp]
|
||||
mov rdx, QWORD PTR -16[rbp]
|
||||
add rdx, rcx
|
||||
movzx eax, BYTE PTR [rax]
|
||||
mov BYTE PTR [rdx], al
|
||||
add QWORD PTR -16[rbp], 1
|
||||
.L34:
|
||||
mov rdx, QWORD PTR -24[rbp]
|
||||
mov rax, QWORD PTR -16[rbp]
|
||||
add rax, rdx
|
||||
cmp rax, QWORD PTR -8[rbp]
|
||||
jb .L35
|
||||
mov eax, 0
|
||||
.L33:
|
||||
leave
|
||||
.cfi_def_cfa 7, 8
|
||||
ret
|
||||
.cfi_endproc
|
||||
.LFE13:
|
||||
.size get_name, .-get_name
|
||||
.globl main
|
||||
.type main, @function
|
||||
main:
|
||||
.LFB14:
|
||||
.cfi_startproc
|
||||
push rbp
|
||||
.cfi_def_cfa_offset 16
|
||||
.cfi_offset 6, -16
|
||||
mov rbp, rsp
|
||||
.cfi_def_cfa_register 6
|
||||
sub rsp, 96
|
||||
mov DWORD PTR -84[rbp], edi
|
||||
mov QWORD PTR -96[rbp], rsi
|
||||
mov rax, QWORD PTR -96[rbp]
|
||||
add rax, 8
|
||||
mov rax, QWORD PTR [rax]
|
||||
mov rdi, rax
|
||||
call openfile
|
||||
mov DWORD PTR -12[rbp], eax
|
||||
mov edx, 64
|
||||
lea rax, name[rip]
|
||||
mov rsi, rax
|
||||
mov edi, 0
|
||||
call read@PLT
|
||||
mov QWORD PTR -8[rbp], 0
|
||||
mov QWORD PTR -80[rbp], 0
|
||||
mov QWORD PTR -72[rbp], 0
|
||||
mov QWORD PTR -64[rbp], 0
|
||||
mov QWORD PTR -56[rbp], 0
|
||||
mov QWORD PTR -48[rbp], 0
|
||||
mov QWORD PTR -40[rbp], 0
|
||||
mov QWORD PTR -32[rbp], 0
|
||||
mov QWORD PTR -24[rbp], 0
|
||||
.L39:
|
||||
mov eax, 0
|
||||
call find_fullname_end
|
||||
test rax, rax
|
||||
jne .L37
|
||||
mov eax, DWORD PTR -12[rbp]
|
||||
mov edi, eax
|
||||
call fill_buffer
|
||||
.L37:
|
||||
lea rax, -80[rbp]
|
||||
mov rdi, rax
|
||||
call get_name
|
||||
lea rax, -80[rbp]
|
||||
lea rdx, name[rip]
|
||||
mov rsi, rdx
|
||||
mov rdi, rax
|
||||
call namecmp
|
||||
test eax, eax
|
||||
je .L38
|
||||
add QWORD PTR -8[rbp], 1
|
||||
.L38:
|
||||
mov eax, 0
|
||||
call pop_fullname
|
||||
mov rdx, QWORD PTR buffer_tail[rip]
|
||||
lea rax, buffer[rip]
|
||||
cmp rdx, rax
|
||||
jne .L39
|
||||
mov rax, QWORD PTR -8[rbp]
|
||||
mov rdi, rax
|
||||
call print_count
|
||||
mov eax, 0
|
||||
leave
|
||||
.cfi_def_cfa 7, 8
|
||||
ret
|
||||
.cfi_endproc
|
||||
.LFE14:
|
||||
.size main, .-main
|
||||
.ident "GCC: (Debian 14.2.0-6) 14.2.0"
|
||||
.section .note.GNU-stack,"",@progbits
|
||||
Reference in New Issue
Block a user