Get rid of unneeded function prologues/epilogues

console.asm

@@ -19,24 +19,16 @@ section .text
 ;----- print (char* string) -----;
 ; return value: N/A
 print:
-	push	rbp
-	mov	rbp, rsp
-
 	call	strlen
 	mov	rdx, rax
 	mov	rax, NR_write
 	mov	rsi, rdi
 	mov	rdi, 1
 	syscall
-
-	leave
 	ret
 ;----- puts (char* string) -----;
 ; return  value: N/A
 puts:
-	push	rbp
-	mov	rbp, rsp
-
 	mov	r10, rdi
 	call	print
 	mov	rdi, r10
@@ -45,8 +37,6 @@ puts:
 	mov	rsi, NL
 	mov	rdx, 1
 	syscall
-
-	leave
 	ret
 ;----- printf(const char* string, ...) -----;
 ; Currently only supports specifiers: %d, %c, %s, %%

core.asm

@@ -16,121 +16,78 @@ section	.text
 ;----- min(int a, int b) -----;
 ; return value: lowest value
 min:
-	push	rbp
-	mov	rbp, rsp
-
 	mov	rax, rdi
 	cmp	rdi, rsi
 	cmovg	rax, rsi
-
-	leave
 	ret
 ;----- minu(unsigned int a, unsigned int b) -----;
 ; return value: lowest value
 minu:
-	push	rbp
-	mov	rbp, rsp
-
 	mov	rax, rdi
 	cmp	rdi, rsi
 	cmova	rax, rsi
-
-	leave
 	ret
 ;----- max(int a, int b) -----;
 ; return value: highest value
 max:
-	push	rbp
-	mov	rbp, rsp
-
 	mov	rax, rdi
 	cmp	rdi, rsi
 	cmovl	rax, rsi
-
-	leave
 	ret
 ;----- maxu(unsigned int a, unsigned int b) -----;
 ; return value: highest value
 maxu:
-	push	rbp
-	mov	rbp, rsp
-
 	mov	rax, rdi
 	cmp	rdi, rsi
 	cmovb	rax, rsi
-
-	leave
 	ret
 ;----- islower(char* c) -----;
 ; return value: 1 (character is in range of 'a'-'z') or 0 (character is nog in range of 'a'-'z')
 islower:
-	push	rbp
-	mov	rbp, rsp
-
 	xor	rax, rax
 	cmp	byte [rdi], 'a'
 	jb	.quit
 	cmp	byte [rdi], 'z'
 	ja	.quit
 	mov	rax, 1
-
 	.quit:
-	leave
 	ret
 ;----- isupper(char* c) -----;
 ; return value: 1 (character is in range of 'A'-'Z') or 0 (character is not in range of 'A'-'Z')
 isupper:
-	push	rbp
-	mov	rbp, rsp
-
 	xor	rax, rax
 	cmp	byte [rdi], 'A'
 	jb	.quit
 	cmp	byte [rdi], 'Z'
 	ja	.quit
 	mov	rax, 1
-
 	.quit:
-	leave
 	ret
 ;----- tolower(char* c) -----;
 ; return value: ASCII value. Same as original if it was not an uppercase letter, otherwise lowercase letter
 tolower:
-	push	rbp
-	mov	rbp, rsp
-
 	call	isupper
 	mov	rcx, rax
 	mov	al, byte [rdi]
 	cmp	rcx, 1
 	jne	.quit
 	add	al, 32
-
 	.quit:
-	leave
 	ret
 ;----- toupper(char* c) -----;
 ; return value: ASCII value. Same as original if it was not a lowercase letter, otherwise uppercase letter
 toupper:
-	push	rbp
-	mov	rbp, rsp
-
 	call	islower
 	mov	rcx, rax
 	mov	al, byte [rdi]
 	cmp	rcx, 1
 	jne	.quit
 	sub	al, 32
-
 	.quit:
-	leave
 	ret
 ;----- itoa(int num, char* str) -----;
 ; return value: pointer to str
 itoa:
-	push	rbp
-	mov	rbp, rsp
-
 	push	rbx
 	push	rsi
 	push	rdi
@@ -178,7 +135,6 @@ itoa:
 	.quit:
 	pop	rax
 	pop	rbx
-	leave
 	ret
 ;----- exit(int exit_code) -----;
 ; returns: nothing

file.asm

@@ -21,9 +21,6 @@ section .text
 ;----- fopen(const char *filename, const char mode) -----;
 ; return value: pointer to file or value < 0 (neg errno) if file failed to open
 fopen:
-	push	rbp
-	mov	rbp, rsp
-
 	cmp	sil, 'r'
 	je	.setMode_r
 	cmp	sil, 'w'
@@ -63,14 +60,10 @@ fopen:
 	syscall
 
 	.quit:
-	leave
 	ret
 ;----- fclose(FILE* fp) -----;
 ; return value: 0 on success, below 0 otherwise (neg errno)
 fclose:
-	push	rbp
-	mov	rbp, rsp
-
 	cmp	rdi, 3
 	jl	.ebadf
 
@@ -82,15 +75,11 @@ fclose:
 	mov	rax, -9
 
 	.quit:
-	leave
 	ret
 ;----- fwrite(FILE* fp, char* str) -----;
 ; writes a string to opened file
 ; return value: amount of written characters on success, below 0 otherwise (neg errno)
 fwrite:
-	push	rbp
-	mov	rbp, rsp
-
 	cmp	rdi, 3
 	jl	.ebadf
 
@@ -107,5 +96,4 @@ fwrite:
 	mov	rax, -9
 
 	.quit:
-	leave
 	ret

string.asm

@@ -10,9 +10,6 @@ section	.text
 ;----- strlen(char* str) -----;
 ; return value: amount of characters before EOS was found
 strlen:
-	push	rbp
-	mov	rbp, rsp
-
 	xor	rax, rax
 	.findEOS:
 		cmp	byte [rdi+rax], 0x0
@@ -21,14 +18,10 @@ strlen:
 		jmp	.findEOS
 
 	.quit:
-	leave
 	ret
 ;----- strcpy(char* dest, char* src) -----;
 ; return value: pointer to dest or NULL if nothing was copied (note that EOS is always copied to dest)
 strcpy:
-	push	rbp
-	mov	rbp, rsp
-
 	mov	r11, rdi
 	xor	rax, rax
 	xor	rcx, rcx
@@ -49,14 +42,10 @@ strcpy:
 	mov	rax, rdi
 
 	.quit:
-	leave
 	ret
 ;----- strlcpy(char* dest, char* src, int size) -----;
 ; return value: Length of src
 strlcpy:
-	push	rbp
-	mov	rbp, rsp
-
 	mov	r9, rsi
 	test	rdx, rdx
 	jz	.quit
@@ -79,29 +68,20 @@ strlcpy:
 	.quit:
 	mov	rdi, r9
 	call	strlen
-	leave
 	ret
 ;----- strcat(char* dest, char* src) -----;
 ; return value: pointer to dest
 strcat:
-	push	rbp
-	mov	rbp, rsp
-
 	mov	r8, rdi
 	call	strlen
 	add	rdi, rax
 	call	strcpy
 	mov	rax, r8
-
-	leave
 	ret
 ;----- strcmp(char* str1, char* str2) -----;
 ; return value: 0 if both strings are the same, otherwise index in array str1 where strings mismatch
 ; returns -1 if str2 is longer than str1 and no difference was found before that happens
 strcmp:
-	push	rbp
-	mov	rbp, rsp
-
 	call	strlen
 	xor	r10, r10
 	.compareLoop:
@@ -115,25 +95,21 @@ strcmp:
 		inc	r10
 		jmp	.compareLoop
 	.0f:
-		mov	rax, -1
+	mov	rax, -1
-		cmp	byte [rsi], 0x0
+	cmp	byte [rsi], 0x0
-		jne	.quit
+	jne	.quit
-		xor	rax, rax
+	xor	rax, rax
-		jmp	.quit
+	jmp	.quit
 
 	.mismatch:
-		mov	rax, r10
+	mov	rax, r10
 
 	.quit:
-	leave
 	ret
 ;----- strclr(char* str) -----;
 ; Replaces all characters of a string with \0 untill EOS is found
 ; returns amount of changed characters
 strclr:
-	push	rbp
-	mov	rbp, rsp
-
 	call	strlen
 	mov	rcx, rax
 	mov	rdx, rax
@@ -141,21 +117,14 @@ strclr:
 	cld
     rep	stosb
 	mov	rax, rdx
-
-	leave
 	ret
 ;----- strlclr(char* str, int size) -----;
 ; Replaces characters of a string with \0, using arg size
 ; <!> DANGEROUS FUNCTION, it might exceed string boundaries if used incorrectly. Use strclr() instead!
 ; Function has no return value, rax will be 0 (0x0 stored in rax for opcode stosb)
 strlclr:
-	push	rbp
-	mov	rbp, rsp
-
 	mov	rcx, rsi
 	xor	rax, rax
 	cld
     rep	stosb
-
-	leave
 	ret