AN3350 datasheet(64/185 Pages) STMICROELECTRONICS

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Working with the assembler

AN3350

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Doc ID 018512 Rev 2

In general, code and data statements are stored in the memory sequentially, following their

order in the text. At any given moment, the storing address is termed the current location

(see Section 10.4.4: The current location) and is relative to the beginning of the current

section within which the next statement (code or data) will be stored. The current location

can be changed as shown in Table 6.

Note:

The .align directive will align the current location with respect to the base of the current

compilation unit only. If the object is linked with other objects, effective alignment will depend

on the linker’s configuration.

Table 6.

Data storage directives

Directive

Action

.section sec

Associates the following code and data with section sec.

See Section 10.4.1: Memory spaces and sections for more information.

.org address

Store the following code and data at the resolved address. This

statement begins a new section.

.previous

Revert to the previous section (allows you to toggle between .section

and .org sections).

.endsec

End the current section and returns to the previous section on the stack.

.word integer

Starting at the current location, stores the numeric word integer (in big

endian).

The word’s default size is the current section’s natural word width (in

bytes), but can be explicitly stated using the .b1, .b2, and .b4 attributes.

The storage location is aligned according to word size by default. You

can use the attribute .n to skip alignment.

.leb 128

Store a 32-bit integer in LEB128 format (for use in DWARF objects, for

instance).

Size can vary from one to four bytes. Use attributes .s and .u to store

signed and unsigned integers (the default is unsigned).

.hexa string

Starting at the current location, stores the hexadecimal bytes string.

For example, .hexa “65FF” stores two bytes: 101, and 255.

.ascii string

Starting at the current location, stores the ASCII bytes in string.

.asciz string

Starting at the current location, stores the ASCII bytes in string, and

append a zero byte to the end.

.skip integer

Increment the current location integer bytes.

The number of bytes incremented is integer times the current section’s

natural word width (in bytes). You can explicitly specify the number of

bytes by using the .b1, .b2, and .b4 attributes. Skipped bytes are filled

with zero in the data space, and with 0xFF in the code space.

.align integer

Advance the current location (with padding) as required to be aligned on

a word address boundary set by 2^integer (where integer has a range of

1 through 16). You can use the .b1, .b2, and .b4 attributes to specify

other word sizes

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