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[NUC472/M453] Refine comment for two-region model

pull/2861/head
ccli8 2016-09-19 15:25:24 +08:00
parent 107d6336b2
commit dfc32409a9
3 changed files with 14 additions and 7 deletions
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5
platform/retarget.cpp
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@ -574,7 +574,10 @@ register unsigned char * stack_ptr __asm ("sp");
// Dynamic memory allocation related syscall.
#if defined(TARGET_NUMAKER_PFM_NUC472) || defined(TARGET_NUMAKER_PFM_M453)
// Overwrite _sbrk() to support two region model.
// Overwrite _sbrk() to support two region model (heap and stack are two distinct regions).
// __wrap__sbrk() is implemented in:
// TARGET_NUMAKER_PFM_NUC472 hal/targets/cmsis/TARGET_NUVOTON/TARGET_NUC472/TARGET_NUMAKER_PFM_NUC472/TOOLCHAIN_GCC_ARM/retarget.c
// TARGET_NUMAKER_PFM_M453 hal/targets/cmsis/TARGET_NUVOTON/TARGET_M451/TARGET_NUMAKER_PFM_M453/TOOLCHAIN_GCC_ARM/retarget.c
extern "C" void *__wrap__sbrk(int incr);
extern "C" caddr_t _sbrk(int incr) {
return (caddr_t) __wrap__sbrk(incr);

8
targets/TARGET_NUVOTON/TARGET_NUC472/device/TOOLCHAIN_GCC_ARM/retarget.c
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@ -15,9 +15,11 @@
extern uint32_t __mbed_sbrk_start;
extern uint32_t __mbed_krbs_start;
// NOTE: The implementation of _sbrk (in common/retarget.cpp) for GCC_ARM requires one-region model for heap and stack, which doesn't
// meet the layout of e.g. Nu-mbed-NUC472 board where heap is located on external SRAM.
// Because the symbol is not weak and cannot be overwritten, wrap calls to it by hooking command line linker with '-Wl,--wrap,_sbrk'.
/**
* The default implementation of _sbrk() (in common/retarget.cpp) for GCC_ARM requires one-region model (heap and stack share one region), which doesn't
* fit two-region model (heap and stack are two distinct regions), for example, NUMAKER-PFM-NUC472 locates heap on external SRAM. Define __wrap__sbrk() to
* override the default _sbrk(). It is expected to get called through gcc hooking mechanism ('-Wl,--wrap,_sbrk') or in _sbrk().
*/
void *__wrap__sbrk(int incr)
{
static uint32_t heap_ind = (uint32_t) &__mbed_sbrk_start;

8
targets/cmsis/TARGET_NUVOTON/TARGET_M451/TARGET_NUMAKER_PFM_M453/TOOLCHAIN_GCC_ARM/retarget.c
View File

@ -15,9 +15,11 @@
extern uint32_t __mbed_sbrk_start;
extern uint32_t __mbed_krbs_start;
// NOTE: The implementation of _sbrk (in common/retarget.cpp) for GCC_ARM requires one-region model for heap and stack, which doesn't
// meet the layout of e.g. Nu-mbed-NUC472 board where heap is located on external SRAM.
// Because the symbol is not weak and cannot be overwritten, wrap calls to it by hooking command line linker with '-Wl,--wrap,_sbrk'.
/**
* The default implementation of _sbrk() (in common/retarget.cpp) for GCC_ARM requires one-region model (heap and stack share one region), which doesn't
* fit two-region model (heap and stack are two distinct regions), for example, NUMAKER-PFM-NUC472 locates heap on external SRAM. Define __wrap__sbrk() to
* override the default _sbrk(). It is expected to get called through gcc hooking mechanism ('-Wl,--wrap,_sbrk') or in _sbrk().
*/
void *__wrap__sbrk(int incr)
{
static uint32_t heap_ind = (uint32_t) &__mbed_sbrk_start;