Doc:Elf:Sections
From GNU 68HC11/HC12
(Difference between revisions)
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| + | ELF sections are defined to organize and classify the data: code, data, | ||
| + | readonly data, specific data. | ||
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<TABLE BORDER=1> | <TABLE BORDER=1> | ||
<TR><TD><b>Section</b></TD> | <TR><TD><b>Section</b></TD> | ||
Revision as of 23:06, 31 January 2006
ELF sections are defined to organize and classify the data: code, data, readonly data, specific data.
| Section | Description |
| .text | This is the standard text section for code program.
By default, the linker places the text at 0x8000. This can
be overridden with -Ttext option.
|
| .rodata | This is the standard read-only data section. It is placed
after the text section by the linker. |
| .data | This is the standard data section. |
| .bss | This is the standard bss section. It appears after the
data section. |
| .page0 | This is a specific section for the 68HC1x to represent the
page 0. It is intended to be used to help in specifying data
which are defined in the first 256-bytes (page 0) of the address
space. It is placed at address 0 by the linker. It is treated as
a .data section.
|
| .eeprom | This is a specific section for the 68HC1x to represent the
internal EEPROM. |
| .install[0-4] | These sections represent some initialization sections.
They are used by the GCC startup code. Some of them are for
used by applications. During the final link, these sections
are merged with the .text section, and are put at
beginning. Therefore, they appear at beginning of ROM area.
The .install0 is reserved. It initializes the stack pointer.
The .install1 is a placeholder for applications.
The .install2 is reserved. It initializes the bss and
data sections. The .install3 is a placeholder for applications.
The .install4 is reserved and invokes the main.
|
| .fini[0-4] | These sections represent some termination sections.
They are used by the GCC finish code (exit). Some of them are for
used by applications. During the final link, these sections
are merged with the .text section. .fini0 and
.fini4 are reserved. .fini1 is a placeholder for
applications. It can contain code which is executed during exit
and before the C++ static destructors. .fini2 is reserved
and corresponds to the C++ static destructors. .fini3 is
a placeholder for applications. This code is executed after
the C++ static destructors are called. The .fini4 is
reserved and corresponds to the runtime exit.
|
| .vectors | This is a specific section for the 68HC1x to represent the
vectors table. By default the vectors table is located at 0xffc0
and placed at that address by the linker. By using the
-defsym vectors_addr=addr linker option, it is
possible to set another address for the vectors table. For
example, -defsym vectors_addr=0xbfc0 sets the vectors
table at 0xbfc0.
|
| .softregs | This is a specific section for the 68HC1x to hold the
gcc soft registers. For 68HC11, this section is put during the
final link in the .page0 section. For 68HC12, it is
put in the .bss section.
|
| others | Several standard sections exists for DWARF-2 debugging info,
stack frame unwinding description and so on. |
