355 lines
9.1 KiB
C
355 lines
9.1 KiB
C
/*
|
|
ChibiOS - Copyright (C) 2006,2007,2008,2009,2010,
|
|
2011,2012,2013,2014 Giovanni Di Sirio.
|
|
|
|
This file is part of ChibiOS.
|
|
|
|
ChibiOS is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
ChibiOS is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/**
|
|
* @file ARMCMx/GCC/crt0.c
|
|
* @brief Generic GCC Cortex-Mx startup file.
|
|
*
|
|
* @addtogroup ARMCMx_GCC_STARTUP
|
|
* @{
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
|
|
#if !defined(FALSE)
|
|
#define FALSE 0
|
|
#endif
|
|
|
|
#if !defined(TRUE)
|
|
#define TRUE (!FALSE)
|
|
#endif
|
|
|
|
#define SCB_CPACR *((uint32_t *)0xE000ED88U)
|
|
#define SCB_FPCCR *((uint32_t *)0xE000EF34U)
|
|
#define SCB_FPDSCR *((uint32_t *)0xE000EF3CU)
|
|
#define FPCCR_ASPEN (0x1U << 31)
|
|
#define FPCCR_LSPEN (0x1U << 30)
|
|
|
|
typedef void (*funcp_t)(void);
|
|
typedef funcp_t * funcpp_t;
|
|
|
|
#define SYMVAL(sym) (uint32_t)(((uint8_t *)&(sym)) - ((uint8_t *)0))
|
|
|
|
/*
|
|
* Area fill code, it is a macro because here functions cannot be called
|
|
* until stacks are initialized.
|
|
*/
|
|
#define fill32(start, end, filler) { \
|
|
uint32_t *p1 = (start); \
|
|
uint32_t *p2 = (end); \
|
|
while (p1 < p2) \
|
|
*p1++ = (filler); \
|
|
}
|
|
|
|
/*===========================================================================*/
|
|
/**
|
|
* @name Startup settings
|
|
* @{
|
|
*/
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Control special register initialization value.
|
|
* @details The system is setup to run in privileged mode using the PSP
|
|
* stack (dual stack mode).
|
|
*/
|
|
#if !defined(CRT0_CONTROL_INIT) || defined(__DOXYGEN__)
|
|
#define CRT0_CONTROL_INIT 0x00000002
|
|
#endif
|
|
|
|
/**
|
|
* @brief Stack segments initialization switch.
|
|
*/
|
|
#if !defined(CRT0_STACKS_FILL_PATTERN) || defined(__DOXYGEN__)
|
|
#define CRT0_STACKS_FILL_PATTERN 0x55555555
|
|
#endif
|
|
|
|
/**
|
|
* @brief Stack segments initialization switch.
|
|
*/
|
|
#if !defined(CRT0_INIT_STACKS) || defined(__DOXYGEN__)
|
|
#define CRT0_INIT_STACKS TRUE
|
|
#endif
|
|
|
|
/**
|
|
* @brief DATA segment initialization switch.
|
|
*/
|
|
#if !defined(CRT0_INIT_DATA) || defined(__DOXYGEN__)
|
|
#define CRT0_INIT_DATA TRUE
|
|
#endif
|
|
|
|
/**
|
|
* @brief BSS segment initialization switch.
|
|
*/
|
|
#if !defined(CRT0_INIT_BSS) || defined(__DOXYGEN__)
|
|
#define CRT0_INIT_BSS TRUE
|
|
#endif
|
|
|
|
/**
|
|
* @brief Constructors invocation switch.
|
|
*/
|
|
#if !defined(CRT0_CALL_CONSTRUCTORS) || defined(__DOXYGEN__)
|
|
#define CRT0_CALL_CONSTRUCTORS TRUE
|
|
#endif
|
|
|
|
/**
|
|
* @brief Destructors invocation switch.
|
|
*/
|
|
#if !defined(CRT0_CALL_DESTRUCTORS) || defined(__DOXYGEN__)
|
|
#define CRT0_CALL_DESTRUCTORS TRUE
|
|
#endif
|
|
|
|
/** @} */
|
|
|
|
/*===========================================================================*/
|
|
/**
|
|
* @name Symbols from the scatter file
|
|
*/
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Main stack lower boundary.
|
|
* @details This symbol must be exported by the linker script and represents
|
|
* the main stack lower boundary.
|
|
*/
|
|
extern uint32_t __main_stack_base__;
|
|
|
|
/**
|
|
*
|
|
* @brief Main stack initial position.
|
|
* @details This symbol must be exported by the linker script and represents
|
|
* the main stack initial position.
|
|
*/
|
|
extern uint32_t __main_stack_end__;
|
|
|
|
/**
|
|
* @brief Process stack lower boundary.
|
|
* @details This symbol must be exported by the linker script and represents
|
|
* the process stack lower boundary.
|
|
*/
|
|
extern uint32_t __process_stack_base__;
|
|
|
|
/**
|
|
* @brief Process stack initial position.
|
|
* @details This symbol must be exported by the linker script and represents
|
|
* the process stack initial position.
|
|
*/
|
|
extern uint32_t __process_stack_end__;
|
|
|
|
/**
|
|
* @brief ROM image of the data segment start.
|
|
* @pre The symbol must be aligned to a 32 bits boundary.
|
|
*/
|
|
extern uint32_t _textdata;
|
|
|
|
/**
|
|
* @brief Data segment start.
|
|
* @pre The symbol must be aligned to a 32 bits boundary.
|
|
*/
|
|
extern uint32_t _data;
|
|
|
|
/**
|
|
* @brief Data segment end.
|
|
* @pre The symbol must be aligned to a 32 bits boundary.
|
|
*/
|
|
extern uint32_t _edata;
|
|
|
|
/**
|
|
* @brief BSS segment start.
|
|
* @pre The symbol must be aligned to a 32 bits boundary.
|
|
*/
|
|
extern uint32_t _bss_start;
|
|
|
|
/**
|
|
* @brief BSS segment end.
|
|
* @pre The symbol must be aligned to a 32 bits boundary.
|
|
*/
|
|
extern uint32_t _bss_end;
|
|
|
|
/**
|
|
* @brief Constructors table start.
|
|
* @pre The symbol must be aligned to a 32 bits boundary.
|
|
*/
|
|
extern funcp_t __init_array_start;
|
|
|
|
/**
|
|
* @brief Constructors table end.
|
|
* @pre The symbol must be aligned to a 32 bits boundary.
|
|
*/
|
|
extern funcp_t __init_array_end;
|
|
|
|
/**
|
|
* @brief Destructors table start.
|
|
* @pre The symbol must be aligned to a 32 bits boundary.
|
|
*/
|
|
extern funcp_t __fini_array_start;
|
|
|
|
/**
|
|
* @brief Destructors table end.
|
|
* @pre The symbol must be aligned to a 32 bits boundary.
|
|
*/
|
|
extern funcp_t __fini_array_end;
|
|
|
|
/** @} */
|
|
|
|
/**
|
|
* @brief Application @p main() function.
|
|
*/
|
|
extern void main(void);
|
|
|
|
/**
|
|
* @brief Early initialization.
|
|
* @details This hook is invoked immediately after the stack initialization
|
|
* and before the DATA and BSS segments initialization. The
|
|
* default behavior is to do nothing.
|
|
* @note This function is a weak symbol.
|
|
*/
|
|
#if !defined(__DOXYGEN__)
|
|
__attribute__((weak))
|
|
#endif
|
|
void __early_init(void) {}
|
|
|
|
/**
|
|
* @brief Late initialization.
|
|
* @details This hook is invoked after the DATA and BSS segments
|
|
* initialization and before any static constructor. The
|
|
* default behavior is to do nothing.
|
|
* @note This function is a weak symbol.
|
|
*/
|
|
#if !defined(__DOXYGEN__)
|
|
__attribute__((weak))
|
|
#endif
|
|
void __late_init(void) {}
|
|
|
|
/**
|
|
* @brief Default @p main() function exit handler.
|
|
* @details This handler is invoked or the @p main() function exit. The
|
|
* default behavior is to enter an infinite loop.
|
|
* @note This function is a weak symbol.
|
|
*/
|
|
#if !defined(__DOXYGEN__)
|
|
__attribute__((noreturn, weak))
|
|
#endif
|
|
void _default_exit(void) {
|
|
while (1)
|
|
;
|
|
}
|
|
|
|
/**
|
|
* @brief Reset vector.
|
|
*/
|
|
#if !defined(__DOXYGEN__)
|
|
__attribute__((naked))
|
|
#endif
|
|
void Reset_Handler(void) {
|
|
uint32_t psp, reg;
|
|
|
|
/* Process Stack initialization, it is allocated starting from the
|
|
symbol __process_stack_end__ and its lower limit is the symbol
|
|
__process_stack_base__.*/
|
|
asm volatile ("cpsid i");
|
|
psp = SYMVAL(__process_stack_end__);
|
|
asm volatile ("msr PSP, %0" : : "r" (psp));
|
|
|
|
#if CORTEX_USE_FPU
|
|
/* Initializing the FPU context save in lazy mode.*/
|
|
SCB_FPCCR = FPCCR_ASPEN | FPCCR_LSPEN;
|
|
|
|
/* CP10 and CP11 set to full access.*/
|
|
SCB_CPACR |= 0x00F00000;
|
|
|
|
/* FPSCR and FPDSCR initially zero.*/
|
|
reg = 0;
|
|
asm volatile ("vmsr FPSCR, %0" : : "r" (reg) : "memory");
|
|
SCB_FPDSCR = reg;
|
|
|
|
/* CPU mode initialization, enforced FPCA bit.*/
|
|
reg = CRT0_CONTROL_INIT | 4;
|
|
#else
|
|
/* CPU mode initialization.*/
|
|
reg = CRT0_CONTROL_INIT;
|
|
#endif
|
|
asm volatile ("msr CONTROL, %0" : : "r" (reg));
|
|
asm volatile ("isb");
|
|
|
|
/* Early initialization hook invocation.*/
|
|
__early_init();
|
|
|
|
#if CRT0_INIT_STACKS
|
|
/* Main and Process stacks initialization.*/
|
|
fill32(&__main_stack_base__,
|
|
&__main_stack_end__,
|
|
CRT0_STACKS_FILL_PATTERN);
|
|
fill32(&__process_stack_base__,
|
|
&__process_stack_end__,
|
|
CRT0_STACKS_FILL_PATTERN);
|
|
#endif
|
|
|
|
#if CRT0_INIT_DATA
|
|
/* DATA segment initialization.*/
|
|
{
|
|
uint32_t *tp, *dp;
|
|
|
|
tp = &_textdata;
|
|
dp = &_data;
|
|
while (dp < &_edata)
|
|
*dp++ = *tp++;
|
|
}
|
|
#endif
|
|
|
|
#if CRT0_INIT_BSS
|
|
/* BSS segment initialization.*/
|
|
fill32(&_bss_start, &_bss_end, 0);
|
|
#endif
|
|
|
|
/* Late initialization hook invocation.*/
|
|
__late_init();
|
|
|
|
#if CRT0_CALL_CONSTRUCTORS
|
|
/* Constructors invocation.*/
|
|
{
|
|
funcpp_t fpp = &__init_array_start;
|
|
while (fpp < &__init_array_end) {
|
|
(*fpp)();
|
|
fpp++;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Invoking application main() function.*/
|
|
main();
|
|
|
|
#if CRT0_CALL_DESTRUCTORS
|
|
/* Destructors invocation.*/
|
|
{
|
|
funcpp_t fpp = &__fini_array_start;
|
|
while (fpp < &__fini_array_end) {
|
|
(*fpp)();
|
|
fpp++;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Invoking the exit handler.*/
|
|
_default_exit();
|
|
}
|
|
|
|
/** @} */
|