FirasOS
/
Macro.source

<head language="Chinese">

</head>
<head language="English">

</head>
<comment language="Chinese">
--	在MBR、VBR之类的对代码占用的空间要小的地方，
	用xor指令清零再用or 1或inc指令比但用一条
	mov 1指令所需空间更少
--	例如mov eax, 1的机器码为5字节的0xB8 0x01 0x00 0x00 0x00
	或0xC7 0x01 0x00 0x00 0x00
	mov rax, 1的机器码为10字节的
	0x48 0xB8 0x01 0x00 0x00 0x00 0x00 0x00 0x00 0x00
	或7字节的0x48 0xC7 0xC0 0x01 0x00 0x00 0x00
--	而xor eax, eax的机器码为0x31 0xC0
	xor rax, rax的机器码为0x48 0x31 0xC0
	32位模式中inc eax的机器码为0x40
	64位模式中inc eax的机器码为0xFF 0xC0
	or al, 1的机器码为0x0C 0x01
</comment>
<assemblyX86 compiler="fasm">
IF ~DEFINED _MACRO_H_
_MACRO_H_	EQU	1

; reg can be a 32-bit general register
MACRO	MOV1TO	reg{
	xor	reg,	reg
	inc	reg
} ; MACRO MOV1TO
</assemblyX86>
<assemblyX64 compiler="fasm">
IF ~DEFINED _MACRO_H_
_MACRO_H_	EQU	1

; reg can be a 64-bit or 32-bit general register
MACRO	MOV1TO	reg{
	xor	reg,	reg
MATCH =rax, reg \{	or	al,	1	\}
MATCH =rbx, reg \{	or	bl,	1	\}
MATCH =rcx, reg \{	or	cl,	1	\}
MATCH =rdx, reg \{	or	dl,	1	\}
MATCH =rbp, reg \{	inc	ebp		\}
MATCH =rsi, reg \{	inc	esi		\}
MATCH =rdi, reg \{	inc	edi		\}
MATCH =eax, reg \{	or	al,	1	\}
MATCH =ebx, reg \{	or	bl,	1	\}
MATCH =ecx, reg \{	or	cl,	1	\}
MATCH =edx, reg \{	or	dl,	1	\}
MATCH =ebp, reg \{	inc	ebp		\}
MATCH =esi, reg \{	inc	esi		\}
MATCH =edi, reg \{	inc	edi		\}
} ; MACRO MOV1TO
</assemblyX64>
<cpp>
#ifndef _MACRO_H_
#define _MACRO_H_

#if defined(_X64_)
	#define CALLCONV __fastcall
#elif defined(_X86_)
	#define CALLCONV __stdcall
#else
	#define CALLCONV
#endif

typedef signed char	INT8;
typedef signed short	INT16;
typedef signed long	INT32;
typedef signed long long	INT64;

typedef unsigned char	BYTE, UINT8;
#if 1
// on x86 and x64
typedef unsigned short	WORD, UINT16;
typedef unsigned long	DWORD, UINT32;
typedef unsigned long long	QWORD, UINT64;
#elif 0
typedef unsigned short	HWORD, UINT16;
typedef unsigned long	WORD, UINT32;
typedef unsigned long long	DWORD, UINT64;
#endif
typedef float		REAL4;
typedef double		REAL8;
typedef long double 	REAL10;

typedef unsigned int	BOOLEAN;
#define TRUE	((BOOLEAN)1)
#define FALSE	((BOOLEAN)0)

const INT8	INT8_MAX = 0x7F,	INT8_MIN = 0x80;
const UINT8	UINT8_MAX = 0xFF;
const INT16	INT16_MAX = 0x7FFF,	INT16_MIN = 0x8000;
const UINT16	UINT16_MAX = 0xFFFF;
const INT32	INT32_MAX = 0x7FFFFFFF,	INT32_MIN = 0x80000000;
const UINT32	UINT32_MAX = 0xFFFFFFFF;
const INT64	INT64_MAX = 0x7FFFFFFFFFFFFFFFLL;
const INT64	INT64_MIN = 0x8000000000000000LL;
const UINT64	UINT64_MAX = 0xFFFFFFFFFFFFFFFFLL;
</cpp>
<assemblyX64 compiler="fasm">
INT8_MAX	EQU 7Fh
INT8_MIN	EQU 80h
UINT8_MAX	EQU 0FFh
INT16_MAX	EQU 7FFFh
INT16_MIN	EQU 8000h
UINT16_MAX	EQU 0FFFFh
INT32_MAX	EQU 7FFFFFFFh
INT32_MIN	EQU 80000000h
UINT32_MAX	EQU 0FFFFFFFFh
INT64_MAX	EQU 7FFFFFFFFFFFFFFFh
INT64_MIN	EQU 8000000000000000h
UINT64_MAX	EQU 0FFFFFFFFFFFFFFFFh

MACRO TEST_NULL reg{
	test	reg,	reg
	jnz	@F
	; TODO: NullPointerException
	xor	rax,	rax
	ret
@@:
} ; MACRO TEST_NULL

END IF ; ~DEFINED _MACRO_H_
</assemblyX64>
<assemblyX86 compiler="fasm">
INT8_MAX	EQU 7Fh
INT8_MIN	EQU 80h
UINT8_MAX	EQU 0FFh
INT16_MAX	EQU 7FFFh
INT16_MIN	EQU 8000h
UINT16_MAX	EQU 0FFFFh
INT32_MAX	EQU 7FFFFFFFh
INT32_MIN	EQU 80000000h
UINT32_MAX	EQU 0FFFFFFFFh

MACRO TEST_NULL mem, n{
	cmp	mem,	0
	jne	@F
	; TODO: NullPointerException
	xor	eax,	eax
	retn	n
@@:
} ; MACRO TEST_NULL
END IF ; ~DEFINED _MACRO_H_
</assemblyX86>
<cpp>
#endif // _MACRO_H_
</cpp>