Epson S5U1C17001C, Manual

Page: 111 / 742

S5U1C17001C ManUal
EPSOn
4-7
(C COMPilEr PaCkagE fOr S1C17 faMily) (Ver. 1.5.0)
4 SOUrCE filES
4
SrcFiles
(2) assembler Directives
The
as
assembler supports the standard directives provided in the gnu assembler. Refer to the gnu assembler
manual for the standard directives. Each directive begins with a period (.). The following lists often-utilized
directives.
.text
Declares a
.text
section.
.section .data
Declares a
.data
section.
.section .rodata
Declares a
.rodata
section.
.section .bss
Declares a
.bss
section.
.long
<data> Defines a 4-byte data.
.short
<data> Defines a 2-byte data.
.byte
<data> Defines a byte data.
.ascii
<string> Defines an ASCII character strings.
.space
<length> Defines a blank (0x0) space.
.zero
<length> Defines a blank (0x0) space.
.align
<value> Alignment to a specified boundary address.
.global
<symbol> Defines a global symbol.
.set
<symbol>
,
<address> Defines a symbol with an absolute address.
(3) labels
A label is an identifier designed to refer to an arbitrary address in the program. You can refer to a branch
destination of a program or an address in the
.text
/
.data
section by using a symbol defined as a label.
Definition of a label
A symbol described in the following format is regarded as a label.
<Symbol>
:
Preceding spaces and tabs are ignored. It is a general practice to describe from the top of a line.
A defined symbol denotes the address of a described location.
An actual address value will be determined in the linking process.
restrictions
Only the following characters can be used:
A–Z a–z _ 0–9
A label cannot begin with a numeral. Uppercase and lowercase are discriminated.
Examples:
;OK ;Error
FOO: 1label:
_Abcd: 0_ABC:
L1: