Remove debug util
This commit is contained in:
nub31
@@ -1,311 +0,0 @@
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;*********************************************************************
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; util.asm
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; Version: 1.2
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; Author: mjbrusso
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; Contributors: AlessandroFonseca
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; Licensed under the MIT license (see "license.txt").
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;*********************************************************************
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global printint
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SYS_READ: equ 0
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SYS_WRITE: equ 1
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SYS_EXIT: equ 60
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STDIN: equ 0
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STDOUT: equ 1
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LINEFEED: equ 0x0A
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section .text
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;*********************************************************************
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; void exit(int64 code)
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;
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; Description:
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; Quit program
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;
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; Arguments:
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; rdi: int64 code: Exit code (0=Success, >0=Error)
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;
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; Returns:
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; This function does not return
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;
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;*********************************************************************
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exit:
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mov rax, SYS_EXIT ; rax: system call number
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syscall
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;*********************************************************************
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;*********************************************************************
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; void exit0()
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;
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; Description:
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; Quit program with status code = 0
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;
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; Arguments:
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; None
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;
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; Returns:
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; This function does not return
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;
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;*********************************************************************
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exit0:
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xor rdi, rdi ; rdi = 0
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jmp exit ; TCO: tail call optimization
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;*********************************************************************
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;*********************************************************************
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; int64 strlen(char *s)
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;
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; Description:
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; Calculates the length of string ( excluding the terminating null)
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;
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; Arguments:
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; rdi: char *s: address of a null-terminated string (array of chars terminated by 0)
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;
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; Returns:
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; rax: int64: string size
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;
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;*********************************************************************
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strlen:
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xor rax, rax ; rax=0; // reset counter
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.loop: ; do{
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cmp byte [rdi], 0 ; if (*s==0); // If zero, skip loop
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je strlen.end ; break;
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inc rax ; rax++; // increment counter
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inc rdi ; s++; // advance to the next char
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jmp strlen.loop ; }while(true);
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.end:
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ret ; return rax;
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;*********************************************************************
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;*********************************************************************
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; void itoa(int64 value, char *s)
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;
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; Description:
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; Converts an integer to a null-terminated string.
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;
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; Arguments:
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; rdi: int64 value: Integer value to convert.
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; rsi: char *s: Memory address where to store the resulting string.
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;
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; Returns:
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; rax: int64: string size
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;
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;*********************************************************************
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itoa:
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test rdi, rdi ; value = rdi
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jz itoa.iszero ; value==0 has a direct solution
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jns itoa.notneg ; if(value <0 )
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mov byte [rsi], '-' ; *s = '-'
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neg rdi ; value = -value
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inc rsi ; s++
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.notneg:
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mov r9b, 1 ; bool leftzero=true
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mov r10, 10 ; base = 10
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mov rcx, 1000000000000000000 ; divisor = 1000000000000000000
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mov r8, 19 ; cont = 19 // Will repeat 19 times
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.loop: ; do{
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mov rax, rdi ; dividend[0..31] = value
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xor rdx, rdx ; dividend[32..63] = 0
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idiv rcx ; rax=(rdx:rax)/rcx ; rdx=(rdx:rax)%rcx
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test al, al ; digit = rax[0..7]
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jnz itoa.notdigit0 ; if(digit!=0)
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test r9b, r9b ; if(leftzero)
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jnz itoa.nextdigit ; continue
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jmp itoa.digit0
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.notdigit0:
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xor r9b, r9b ; leftzero = false
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.digit0:
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add eax, 48 ; digit = '0' + digit
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mov rdi, rdx ; value %= divisor
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mov byte [rsi], al ; *p = digit
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inc rsi ; p++
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.nextdigit:
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mov rax, rcx ; dividend[0..31] = value
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xor rdx, rdx ; dividend[32..63] = 0
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idiv r10 ; rax=(rdx:rax)/10 ; rdx=(rdx:rax)%10
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mov rcx, rax ; divisor /= 10
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dec r8 ; cont--
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jne itoa.loop ; }while(cont!=0)
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.end:
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mov byte [rsi], 0 ; *p = '\0'
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ret
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.iszero:
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mov word [rsi], 0x0030 ; *p = "0" (x86 is little endian)
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ret
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;*********************************************************************
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;*********************************************************************
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; int64 atoi(char *s)
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;
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; Description:
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; Convert string to integer.
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;
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; Arguments:
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; rdi: char *s: Address of a null-terminated string (array of chars terminated by 0)
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;
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; Returns:
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; rax: int64: integer value
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;*********************************************************************
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atoi:
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push r12 ; r12 is callee saved
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mov r12, rdi ; rdi is caller saved
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call strlen
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lea rdi, [r12+rax-1] ; char *p = &s[strlen(string)]; //scans string backward
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xor rax, rax ; result value
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mov rdx, 1 ; multiplier
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.beginloop:
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cmp rdi, r12 ; while(p>=s){
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jl atoi.end ;
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xor rcx, rcx ;
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mov cl, byte [rdi] ; cl = current char
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cmp cl, '-' ; if(cl=='-')
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jne atoi.notneg ;
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neg rax ; rax=-rax
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jmp atoi.end ;
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.notneg:
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cmp cl, '9' ; if(!isdigit(cl)) nextdigit
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jg atoi.endloop ;
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sub cl, '0' ;
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jl atoi.endloop ;
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imul rcx, rdx ; digit_value = current_char * multiplier
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add rax, rcx ; result += digit_value
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imul rdx, 10 ; multiplier *= 10
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.endloop:
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dec rdi ; previous char //scans string backward
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jmp atoi.beginloop ; }
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.end:
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pop r12 ; restore r12
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ret
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;*********************************************************************
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;*********************************************************************
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; void endl()
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;
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; Description:
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; Prints a newline (line break)
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;
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; Arguments:
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; None
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;
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; Returns:
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; Nothing
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;
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;*********************************************************************
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endl:
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lea rdi, [endl.str] ; print the string
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call printstr
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ret
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;*********************************************************************
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;*********************************************************************
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; void printstr(char *s)
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;
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; Description:
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; Print a string
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;
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; Arguments:
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; rdi: char *s: address of a null-terminated string (array of chars terminated by 0)
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;
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; Returns:
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; Nothing
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;
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;*********************************************************************
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printstr:
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push r15 ; r15 is callee saved
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mov r15, rdi ; save copy (rdi should be caller saved)
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call strlen
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mov rdx, rax ; string size
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mov rsi, r15 ; string
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mov rax, SYS_WRITE ; system call number
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mov rdi, STDOUT ; file descriptor
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syscall ; system call
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pop r15
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ret
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;*********************************************************************
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;*********************************************************************
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; void printint(int64 n)
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;
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; Description:
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; Print integer number (decimal)
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;
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; Arguments:
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; rdi: int64 n: Value to print
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;
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; Returns:
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; Nothing
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;
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;*********************************************************************
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printint:
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sub rsp, 40 ; stack allocate a temp string
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mov rsi, rsp ; rdi=value, rsi=&str[0]
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call itoa
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mov rdi, rsp ; rdi=&str[0]
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call printstr ; print number
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add rsp, 40 ; deallocate the string
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ret
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;*********************************************************************
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;*********************************************************************
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; int64 readstr(char *s, int64 maxsize)
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;
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; Description:
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; Read up to *maxsize* chars from standard input into a string.
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;
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; Arguments:
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; rdi: char *s: address of a string (array of chars)
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; rsi: int64 maxsize: input size limit
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;
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; Returns:
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; rax: int64: Number of characters read
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;
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;*********************************************************************
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readstr:
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mov r8, rdi ; copy of buffer address
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mov rax, SYS_READ ; system call number
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mov rdx, rsi ; pointer to buffer
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mov rsi, rdi ; max size
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mov rdi, STDIN ; file descriptor
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syscall ; system call
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dec rax ; removing trailing newline char
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mov byte [r8+rax], 0 ; replace with '\0'
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ret
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;*********************************************************************
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;*********************************************************************
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; int64 readint()
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;
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; Description:
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; Read int64 from standard input
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;
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; Arguments:
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; None
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;
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; Returns:
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; rax: int64: The value entered
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;
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;*********************************************************************
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readint:
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sub rsp, 40 ; char s[40]
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mov rdi, rsp ; rdi = &s[0]
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mov rsi, 21 ; max input size
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call readstr ; read number as string
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mov rdi, rsp ;
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call atoi ; rax = atoi(s)
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add rsp, 40 ; deallocate s from stack
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ret
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;*********************************************************************
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section .data
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endl.str: db LINEFEED, 0
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@@ -1 +0,0 @@
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extern func printint(val: int64);
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