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Reference

• x86-64
  • System V ABI
  • Intel64 Manual
• RISC-V
  • ISA Specification

RISC-V

Registers

Register	ABI Name	Description	Saver
x0	zero	hardwired zero	-
x1	ra	return address	Caller
x2	sp	stack pointer	Callee
x3	gp	global pointer	-
x4	tp	thread pointer	-
x5-7	t0-2	temporary registers	Caller
x8	s0 / fp	saved register / frame pointer	Callee
x9	s1 saved	register	Callee
x10-11	a0-1	function arguments / return values	Caller
x12-17	a2-7	function arguments	Caller
x18-27	s2-11	saved registers	Callee
x28-31	t3-6	temporary registers	Caller

Assembler Directives

Directive	Arguments	Description
.align	integer	align to power of 2 (alias for .p2align)
.file	"filename"	emit filename FILE LOCAL symbol table
.globl	symbol_name	emit symbol_name to symbol table (scope GLOBAL)
.local	symbol_name	emit symbol_name to symbol table (scope LOCAL)
.comm	symbol_name,size,align	emit common object to .bss section
.common	symbol_name,size,align	emit common object to .bss section
.ident	"string"	accepted for source compatibility
.section	[{.text,.data,.rodata,.bss}]	emit section (if not present, default .text) and make current
.size	symbol, symbol	accepted for source compatibility
.text		emit .text section (if not present) and make current
.data		emit .data section (if not present) and make current
.rodata		emit .rodata section (if not present) and make current
.bss		emit .bss section (if not present) and make current
.string	"string"	emit string
.asciz	"string"	emit string (alias for .string)
.equ	name, value	constant definition
.macro	name arg1 [, argn]	begin macro definition \argname to substitute
.endm		end macro definition
.type	symbol, @function	accepted for source compatibility
.option	{rvc,norvc,pic,nopic,push,pop}	RISC-V options
.byte	expression [, expression]*	8-bit comma separated words
.2byte	expression [, expression]*	16-bit comma separated words
.half	expression [, expression]*	16-bit comma separated words
.short	expression [, expression]*	16-bit comma separated words
.4byte	expression [, expression]*	32-bit comma separated words
.word	expression [, expression]*	32-bit comma separated words
.long	expression [, expression]*	32-bit comma separated words
.8byte	expression [, expression]*	64-bit comma separated words
.dword	expression [, expression]*	64-bit comma separated words
.quad	expression [, expression]*	64-bit comma separated words
.dtprelword	expression [, expression]*	32-bit thread local word
.dtpreldword	expression [, expression]*	64-bit thread local word
.sleb128	expression	signed little endian base 128, DWARF
.uleb128	expression	unsigned little endian base 128, DWARF
.p2align	p2,[pad_val=0],max	align to power of 2
.balign	b,[pad_val=0]	byte align
.zero	integer	zero bytes