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startup: add CRT0_ENTRY_HOOK for immediate reset handler callback #103

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startup: add CRT0_ENTRY_HOOK for immediate reset handler callback #103

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11 changes: 11 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 @@ -137,6 +137,13 @@
#define CRT0_CALL_DESTRUCTORS TRUE
#endif

/**
* @brief Entry Hook Enabled.
*/
#if !defined(CRT0_ENTRY_HOOK) || defined(__DOXYGEN__)
#define CRT0_ENTRY_HOOK FALSE
#endif

/**
* @brief Number of extra cores.
*/
Expand All @@ -163,6 +170,10 @@
.thumb_func
.global _crt0_entry
_crt0_entry:
#if CRT0_ENTRY_HOOK == TRUE
ldr R0, =__entry_hook
blx R0
#endif
/* Interrupts are globally masked initially.*/
cpsid i

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11 changes: 11 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 @@ -177,6 +177,13 @@
#define CRT0_CPACR_INIT 0x00F00000
#endif

/**
* @brief Entry Hook Enabled.
*/
#if !defined(CRT0_ENTRY_HOOK) || defined(__DOXYGEN__)
#define CRT0_ENTRY_HOOK FALSE
#endif

/*===========================================================================*/
/* Code section. */
/*===========================================================================*/
Expand All @@ -201,6 +208,10 @@
.thumb_func
.global _crt0_entry
_crt0_entry:
#if CRT0_ENTRY_HOOK == TRUE
ldr R0, =__entry_hook
blx R0
#endif
/* 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 @@ -146,6 +146,20 @@ void __cpu_init(void) {
#endif
}

/**
* @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
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