HP-UX Architecture Conventions

Sections in 64-bit Mode

Space

Subspace

Sort Key

Use

 

 

 

 

 

$GLOBAL$

40

Global variable base address.

 

 

 

 

 

$PLT

6

Procedure linkage table.

 

 

 

 

 

$SHLIB_DATA$

12

Shared library data.

 

 

 

 

 

$SHORTBSS$

80

Uninitialized data and common.

 

 

 

 

 

$SHORTDATA$

24

Global scalar variables.

 

 

 

 

$THREAD_SPECIFIC$

 

16

 

 

 

 

 

 

$TBSS$

40

Thread local storage

 

 

 

 

Sections in 64-bit Mode

In 64-bit mode, the Executable and Linking Format (ELF) uses segments and sections rather than spaces and subspaces.

The concept of spaces maps to the ELF concept of segments, but segments do not apply to relocatable object files. Hence, the Assembler ignores the .SPACE directive for 64-bit assembly programs. Subspaces map directly to the ELF concept of sections, so the .SUBSPA directive switches to or creates a new section. The attributes of a subspace correspond to section attributes as follows:

•Subspace names listed in the table are mapped to their corresponding section name. Names not in this table are unchanged.

SUBSPACE NAME

SECTION NAME

 

 

$BSS$

.bss

 

 

$CODE$

.text

 

 

$DATA$

.data

 

 

$FINI$

.fini

 

 

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Chapter 3