Arm VERSION 1.2 Manual de usuario descargar pdf (Pagina 348)

100

101

Directives Reference

7.7.18 REQUIRE8 and PRESERVE8

The

REQUIRE8

directive specifies that the current file requires 8-byte alignment of the

stack.

The

PRESERVE8

directive specifies that the current file preserves 8-byte alignment of the

stack.

Syntax

REQUIRE8

PRESERVE8

Usage

LDRD

and

STRD

instructions (double-word transfers) only work correctly if the address

they access is 8-byte aligned.

If your code includes

LDRD

STRD

transfers to or from the stack, use

REQUIRE8

to instruct

the linker to ensure that your code is only called from objects that preserve 8-byte

alignment of the stack.

If your code preserves 8-byte alignment of the stack, use

PRESERVE8

to inform the linker.

The linker ensures that any code that requires 8-byte alignment of the stack is only

called, directly or indirectly, by code that preserves 8-byte alignment of the stack.

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