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add entry hook called immediately on reset #102

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add entry hook called immediately on reset #102

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3 changes: 3 additions & 0 deletions os/common/startup/ARMCMx/compilers/GCC/crt0_v6m.S
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Original file line number Diff line number Diff line change
Expand Up @@ -163,6 +163,9 @@
.thumb_func
.global _crt0_entry
_crt0_entry:
ldr R0, =__entry_hook
blx R0

/* Interrupts are globally masked initially.*/
cpsid i

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3 changes: 3 additions & 0 deletions os/common/startup/ARMCMx/compilers/GCC/crt0_v7m.S
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Original file line number Diff line number Diff line change
Expand Up @@ -201,6 +201,9 @@
.thumb_func
.global _crt0_entry
_crt0_entry:
ldr R0, =__entry_hook
blx R0

/* Interrupts are globally masked initially.*/
cpsid i

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14 changes: 14 additions & 0 deletions os/common/startup/ARMCMx/compilers/GCC/crt1.c
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Original file line number Diff line number Diff line change
Expand Up @@ -147,6 +147,20 @@ void __cpu_init(void) {
}

/**
* @brief called immediately at Reset
* @details This hook is invoked immediately after the Reset Handler
*
* @note This function is a weak symbol.
*/
#if !defined(__DOXYGEN__)
__attribute__((weak))
#endif
/*lint -save -e9075 [8.4] All symbols are invoked from asm context.*/
#ifndef __ARDUPILOT__
void __entry_hook(void) {}
#endif

/**
* @brief Early initialization.
* @details This hook is invoked immediately after the stack and core
* initialization and before the DATA and BSS segments
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