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Compiler Runtime Environment
5.7.4
Symbols Required by Startup Code and C Library
This section details the symbols that are required by the startup code and C library.
Currently the default linker script defines these symbols. If an application provides a
custom linker script, the user must ensure that all of the following symbols are provided
in order for the startup code and C library to function:
Symbol Name
_bmxdkpba_address
_bmxdudba_address
_bmxdupba_address
_bss_begin
_bss_end
_data_begin
_data_end
_data_image_begin
_ebase_address
_end
_gp
_heap
_ramfunc_begin
_ramfunc_end
_ramfunc_image_begin
_ramfunc_length
_stack
_vector_spacing
Description
The address to place into the BMXDKPBA register if
_ramfunc_length is greater than 0.
The address to place into the BMXDUDBA register if
_ramfunc_length is greater than 0.
The address to place into the BMXDUPBA register if
_ramfunc_length is greater than 0.
The starting location of the uninitialized data.
Uninitialized data includes both .sbss and .bss .
The end location of the uninitialized data.
Uninitialized data includes both .sbss and .bss .
The starting location of the initialized data.
Initialized data includes .data , .got , .sdata ,
.lit8 , and .lit4 .
The end location of the initialized data. Initialized
data includes .data , .got , .sdata , .lit8 , and
.lit4 .
The starting location in program memory of the
image of initialized data. Initialized data includes
.data , .got , .sdata , .lit8 , and .lit4 .
The location of EBASE .
The end of data allocation. Should be identical to
_heap .
Points to the “middle” of the small variables region.
By convention this is 0x8000 bytes from the first
location used for small variables.
The starting location of the heap in DRM.
The starting location of the RAM functions. This
should be located at a 2K boundary as it is used to
initialize the BMXDKPBA register.
The end location of the RAM functions.
The starting location in program memory of the
image of RAM functions.
The length of the .ramfunc section.
The starting location of the stack in DRM.
Remember that the stack grows from the bottom of
data memory so this symbol should point to the
bottom of the section allocated for the stack.
The initialization value for the vector spacing field in
the IntCtl register.
5.8
CONTENTS OF THE DEFAULT LINKER SCRIPT
The default linker script contains the following categories of information:
? 2007 Microchip Technology Inc.
DS51686A-page 73
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相关PDF资料
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
SY87729LHI-EVAL
BOARD EVAL N SY87729 EXPERIMENT
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