SW006015【PDF 87/120 页】C COMPILER MPLAB C32

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Compiler Runtime Environment

*/

. = ALIGN(32 / 8) ;

} > kseg1_data_mem

. = ALIGN(32 / 8) ;

_end = . ;

_bss_end = . ;

5.8.4.20

.HEAP SECTION

This section reserves space for the heap, which is required for dynamic memory

allocation. A symbol is defined to represent the virtual address of the heap ( _heap ).

The minimum amount of space reserved for the heap is determined by the symbol

_min_heap_size .

/* Heap allocating takes a chunk of memory following BSS */

.heap ALIGN(4) :

{

_heap = . ;

. += _min_heap_size ;

} > kseg1_data_mem

5.8.4.21

.STACK SECTION

This section reserves space for the stack. The minimum amount of space reserved for

the stack is determined by the symbol _min_stack_size .

/* Stack allocation follows the heap */

.stack ALIGN(4) :

{

. += _min_stack_size ;

} > kseg1_data_mem

5.8.4.22

.RAMFUNC SECTION

This section collects the RAM functions from all of the application's input files. This

section is assigned to the data memory region ( kseg1_data_mem ) with a load address

located in the program memory region ( kseg0_program_mem ). Symbols are defined

to represent the virtual begin ( _ramfunc_begin ) and end ( _ramfunc_end )

addresses of this section, as well as the physical begin address of the RAM functions

in program memory ( _ramfunc_image_begin ) and a length of the RAM functions

( _ramfunc_length ). In addition, the addresses for the bus matrix registers are

calculated ( _bmxdkpba_address , _bmxdudba_address , and

_bmxdupba_address ).

/*

* RAM functions go at the end of our stack and heap allocation.

* Alignment of 2K required by the boundary register (BMXDKPBA).

*/

.ramfunc ALIGN(2K) :

{

_ramfunc_begin = . ;

*(.ramfunc .ramfunc.*)

. = ALIGN(4) ;

_ramfunc_end = . ;

} > kseg1_data_mem AT> kseg0_program_mem

_ramfunc_image_begin = LOADADDR(.ramfunc) ;

_ramfunc_length = SIZEOF(.ramfunc) ;

_bmxdkpba_address = _ramfunc_begin - ORIGIN(kseg1_data_mem) ;

_bmxdudba_address = LENGTH(kseg1_data_mem);

_bmxdupba_address = LENGTH(kseg1_data_mem);

? 2007 Microchip Technology Inc.

DS51686A-page 83

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