Подсчёт слов

stepik_base/nasm.code-workspace

@@ -27,6 +27,9 @@
 		{
 			"path": "10_to_2"
 		},
+		{
+			"path": "word_count"
+		},
 		{
 			"path": "../docs"
 		},

stepik_base/word_count/.vscode/launch.json

@@ -0,0 +1,29 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "(lldb) Launch x64",
+            "type": "lldb",
+            "request": "launch",
+            "program": "${workspaceFolder}/build/word_count",
+            "cwd": "${workspaceFolder}/build",
+            "preLaunchTask": "asm64",
+        },
+        {
+            "name": "(gdb) Launch x64",
+            "type": "cppdbg",
+            "request": "launch",
+            "program": "${workspaceFolder}/build/word_count",
+            "cwd": "${workspaceFolder}/build",
+            "preLaunchTask": "asm64"
+        },
+        {
+            "name": "(gdb+gcc) Launch x64",
+            "type": "cppdbg",
+            "request": "launch",
+            "program": "${workspaceFolder}/build/word_count",
+            "cwd": "${workspaceFolder}/build",
+            "preLaunchTask": "asm64+gcc"
+        }
+    ]
+}

stepik_base/word_count/.vscode/tasks.json

@@ -0,0 +1,53 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "asm64",
+            "type": "shell",
+            "command": [
+                "builddir=${workspaceFolder}/build;",
+                "mkdir -p $builddir;",
+                "rawfilename=$builddir/word_count;",
+                "nasm -gdwarf -f elf64 -o $rawfilename.o ${workspaceFolder}/word_count.asm;",
+                "ld -g -o $rawfilename $rawfilename.o;"
+            ],
+            "problemMatcher": {
+                "pattern": {
+                    "regexp": "error"
+                }
+            },
+            "presentation": {
+                "focus": true,
+                "panel": "dedicated",
+                "reveal": "silent",
+                "clear": true
+            },
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            }
+        },
+        {
+            "label": "asm64+gcc",
+            "type": "shell",
+            "command": [
+                "builddir=${workspaceFolder}/build;",
+                "mkdir -p $builddir;",
+                "rawfilename=$builddir/word_count;",
+                "nasm -gdwarf -f elf64 -o $rawfilename.o ${workspaceFolder}/word_count.asm;",
+                "gcc -o $rawfilename $rawfilename.o;"
+            ],
+            "problemMatcher": {
+                "pattern": {
+                    "regexp": "error"
+                }
+            },
+            "presentation": {
+                "focus": true,
+                "panel": "dedicated",
+                "reveal": "silent",
+                "clear": true
+            },
+        }
+    ]
+}

stepik_base/word_count/word_count.asm

@@ -0,0 +1,129 @@
+global _start
+
+section .data
+buff times 350 db 0
+buffend:
+count dq 0
+
+section .text
+default rel
+
+_start:
+    call read_text
+    
+    xor rax, rax
+    mov rcx, [count]
+    dec rcx
+
+    lea rsi, [buff]
+
+    mov r10, 1          ; просто единица
+    mov r8, 0           ; прошлый символ - не пробел
+    .loop:
+        mov dl, [rsi]
+
+        cmp dl, ' '
+        jne .continue   ; если сейчас не пробел - выйти
+        test r8, r8
+        jz .continue    ; если прошлое пробел - выйти
+    
+    .space_after_word:
+        inc rax
+    .continue:
+        mov r8, 0
+        cmp dl, ' '
+        cmovne r8, r10
+        inc rsi
+        loop .loop
+
+    test r8, r8
+    jz .print    ; если прошлое пробел - выйти
+    inc rax
+.print:
+    call print_num_to_buf
+    mov rdx, [count]
+    call write_text
+
+    mov rax, 60
+    mov rdi, 0
+    syscall
+
+; Функция читает текст в буффер
+; Регистры не изменяет
+read_text:
+    push rax
+    push rdi
+    push rsi
+    push rdx
+
+    mov rax, 0          ; sys_read
+    mov rdi, 0          ; stdin
+    lea rsi, [rel buff]       ; адрес буфера
+    mov rdx, 256        ; количество байт
+    syscall
+    mov [count], rax
+
+    pop rdx
+    pop rsi
+    pop rdi
+    pop rax
+    ret
+
+; Функция выводит buff
+; In:
+;   - RSI - начало буфера
+;   - RDX - размер буфера
+; Регистры не изменяет
+write_text:
+    push rax
+    push rdi
+    push rsi
+    push rdx
+
+    mov rax, 1          ; sys_write
+    mov rdi, 1          ; stdout
+    syscall
+    mov [count], rax
+
+    pop rdx
+    pop rsi
+    pop rdi
+    pop rax
+    ret
+
+
+; Функция выводит число в buff
+; In: RAX 
+; Out: RSI - указатель на начало строки
+print_num_to_buf:
+    lea rsi, [buffend]
+    dec rsi
+
+    mov rdi, rsi            ; сохранить последний адрес
+    mov byte [rsi], 0       ; вписать нуль
+    dec rsi
+    mov byte [rsi], 0xA     ; вписать перенос строки
+    dec rsi
+    mov byte [rsi], '0'
+
+    test rax, rax
+    jz .return
+
+    mov rcx, 10         ; десятичный делитель
+
+    .while:
+        xor rdx, rdx
+        test rax, rax
+        jz .break
+        div rcx
+        or dl, 0x30
+        mov [rsi], dl
+        dec rsi
+        jmp .while
+.break:
+    inc rsi
+.return:
+    sub rdi, rsi
+    inc rdi
+    mov [count], rdi
+    ret