355 lines
9.2 KiB
C
355 lines
9.2 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012,2013 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file GCC/crt0.c
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* @brief Generic GCC ARMvx-M (Cortex-M0/M1/M3/M4) startup file.
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*
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* @addtogroup ARMCMx_GCC_STARTUP
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* @{
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*/
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#include <stdint.h>
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#if !defined(FALSE)
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#define FALSE 0
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#endif
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#if !defined(TRUE)
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#define TRUE (!FALSE)
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#endif
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#define SCB_CPACR *((uint32_t *)0xE000ED88U)
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#define SCB_FPCCR *((uint32_t *)0xE000EF34U)
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#define SCB_FPDSCR *((uint32_t *)0xE000EF3CU)
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#define FPCCR_ASPEN (0x1U << 31)
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#define FPCCR_LSPEN (0x1U << 30)
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typedef void (*funcp_t)(void);
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typedef funcp_t * funcpp_t;
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#define SYMVAL(sym) (uint32_t)(((uint8_t *)&(sym)) - ((uint8_t *)0))
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/*
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* Area fill code, it is a macro because here functions cannot be called
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* until stacks are initialized.
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*/
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#define fill32(start, end, filler) { \
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uint32_t *p1 = start; \
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uint32_t *p2 = end; \
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while (p1 < p2) \
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*p1++ = filler; \
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}
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/*===========================================================================*/
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/**
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* @name Startup settings
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* @{
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*/
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/*===========================================================================*/
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/**
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* @brief Control special register initialization value.
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* @details The system is setup to run in privileged mode using the PSP
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* stack (dual stack mode).
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*/
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#if !defined(CRT0_CONTROL_INIT) || defined(__DOXYGEN__)
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#define CRT0_CONTROL_INIT 0x00000002
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#endif
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/**
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* @brief Stack segments initialization switch.
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*/
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#if !defined(CRT0_STACKS_FILL_PATTERN) || defined(__DOXYGEN__)
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#define CRT0_STACKS_FILL_PATTERN 0x55555555
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#endif
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/**
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* @brief Stack segments initialization switch.
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*/
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#if !defined(CRT0_INIT_STACKS) || defined(__DOXYGEN__)
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#define CRT0_INIT_STACKS TRUE
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#endif
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/**
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* @brief DATA segment initialization switch.
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*/
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#if !defined(CRT0_INIT_DATA) || defined(__DOXYGEN__)
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#define CRT0_INIT_DATA TRUE
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#endif
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/**
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* @brief BSS segment initialization switch.
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*/
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#if !defined(CRT0_INIT_BSS) || defined(__DOXYGEN__)
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#define CRT0_INIT_BSS TRUE
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#endif
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/**
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* @brief Constructors invocation switch.
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*/
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#if !defined(CRT0_CALL_CONSTRUCTORS) || defined(__DOXYGEN__)
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#define CRT0_CALL_CONSTRUCTORS TRUE
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#endif
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/**
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* @brief Destructors invocation switch.
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*/
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#if !defined(CRT0_CALL_DESTRUCTORS) || defined(__DOXYGEN__)
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#define CRT0_CALL_DESTRUCTORS TRUE
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#endif
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/** @} */
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/*===========================================================================*/
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/**
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* @name Symbols from the scatter file
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*/
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/*===========================================================================*/
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/**
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* @brief Main stack lower boundary.
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* @details This symbol must be exported by the linker script and represents
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* the main stack lower boundary.
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*/
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extern uint32_t __main_stack_base__;
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/**
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*
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* @brief Main stack initial position.
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* @details This symbol must be exported by the linker script and represents
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* the main stack initial position.
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*/
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extern uint32_t __main_stack_end__;
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/**
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* @brief Process stack lower boundary.
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* @details This symbol must be exported by the linker script and represents
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* the process stack lower boundary.
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*/
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extern uint32_t __process_stack_base__;
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/**
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* @brief Process stack initial position.
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* @details This symbol must be exported by the linker script and represents
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* the process stack initial position.
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*/
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extern uint32_t __process_stack_end__;
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/**
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* @brief ROM image of the data segment start.
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* @pre The symbol must be aligned to a 32 bits boundary.
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*/
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extern uint32_t _textdata;
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/**
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* @brief Data segment start.
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* @pre The symbol must be aligned to a 32 bits boundary.
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*/
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extern uint32_t _data;
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/**
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* @brief Data segment end.
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* @pre The symbol must be aligned to a 32 bits boundary.
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*/
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extern uint32_t _edata;
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/**
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* @brief BSS segment start.
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* @pre The symbol must be aligned to a 32 bits boundary.
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*/
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extern uint32_t _bss_start;
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/**
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* @brief BSS segment end.
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* @pre The symbol must be aligned to a 32 bits boundary.
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*/
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extern uint32_t _bss_end;
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/**
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* @brief Constructors table start.
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* @pre The symbol must be aligned to a 32 bits boundary.
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*/
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extern funcp_t __init_array_start;
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/**
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* @brief Constructors table end.
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* @pre The symbol must be aligned to a 32 bits boundary.
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*/
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extern funcp_t __init_array_end;
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/**
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* @brief Destructors table start.
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* @pre The symbol must be aligned to a 32 bits boundary.
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*/
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extern funcp_t __fini_array_start;
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/**
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* @brief Destructors table end.
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* @pre The symbol must be aligned to a 32 bits boundary.
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*/
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extern funcp_t __fini_array_end;
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/** @} */
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/**
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* @brief Application @p main() function.
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*/
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extern void main(void);
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/**
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* @brief Early initialization.
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* @details This hook is invoked immediately after the stack initialization
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* and before the DATA and BSS segments initialization. The
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* default behavior is to do nothing.
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* @note This function is a weak symbol.
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*/
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#if !defined(__DOXYGEN__)
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__attribute__((weak))
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#endif
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void __early_init(void) {}
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/**
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* @brief Late initialization.
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* @details This hook is invoked after the DATA and BSS segments
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* initialization and before any static constructor. The
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* default behavior is to do nothing.
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* @note This function is a weak symbol.
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*/
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#if !defined(__DOXYGEN__)
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__attribute__((weak))
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#endif
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void __late_init(void) {}
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/**
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* @brief Default @p main() function exit handler.
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* @details This handler is invoked or the @p main() function exit. The
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* default behavior is to enter an infinite loop.
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* @note This function is a weak symbol.
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*/
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#if !defined(__DOXYGEN__)
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__attribute__((weak, naked))
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#endif
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void _default_exit(void) {
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while (1)
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;
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}
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/**
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* @brief Reset vector.
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*/
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#if !defined(__DOXYGEN__)
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__attribute__((naked))
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#endif
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void Reset_Handler(void) {
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uint32_t psp, reg;
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/* Process Stack initialization, it is allocated starting from the
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symbol __process_stack_end__ and its lower limit is the symbol
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__process_stack_base__.*/
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asm volatile ("cpsid i");
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psp = SYMVAL(__process_stack_end__);
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asm volatile ("msr PSP, %0" : : "r" (psp));
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#if CORTEX_USE_FPU
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/* Initializing the FPU context save in lazy mode.*/
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SCB_FPCCR = FPCCR_ASPEN | FPCCR_LSPEN;
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/* CP10 and CP11 set to full access.*/
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SCB_CPACR |= 0x00F00000;
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/* FPSCR and FPDSCR initially zero.*/
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reg = 0;
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asm volatile ("vmsr FPSCR, %0" : : "r" (reg) : "memory");
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SCB_FPDSCR = reg;
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/* CPU mode initialization, enforced FPCA bit.*/
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reg = CRT0_CONTROL_INIT | 4;
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#else
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/* CPU mode initialization.*/
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reg = CRT0_CONTROL_INIT;
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#endif
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asm volatile ("msr CONTROL, %0" : : "r" (reg));
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asm volatile ("isb");
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#if CRT0_INIT_STACKS
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/* Main and Process stacks initialization.*/
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fill32(&__main_stack_base__,
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&__main_stack_end__,
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CRT0_STACKS_FILL_PATTERN);
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fill32(&__process_stack_base__,
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&__process_stack_end__,
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CRT0_STACKS_FILL_PATTERN);
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#endif
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/* Early initialization hook invocation.*/
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__early_init();
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#if CRT0_INIT_DATA
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/* DATA segment initialization.*/
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{
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uint32_t *tp, *dp;
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tp = &_textdata;
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dp = &_data;
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while (dp < &_edata)
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*dp++ = *tp++;
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}
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#endif
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#if CRT0_INIT_BSS
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/* BSS segment initialization.*/
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fill32(&_bss_start, &_bss_end, 0);
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#endif
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/* Late initialization hook invocation.*/
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__late_init();
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#if CRT0_CALL_CONSTRUCTORS
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/* Constructors invocation.*/
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{
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funcpp_t fpp = &__init_array_start;
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while (fpp < &__init_array_end) {
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(*fpp)();
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fpp++;
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}
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}
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#endif
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/* Invoking application main() function.*/
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main();
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#if CRT0_CALL_DESTRUCTORS
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/* Destructors invocation.*/
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{
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funcpp_t fpp = &__fini_array_start;
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while (fpp < &__fini_array_end) {
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(*fpp)();
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fpp++;
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}
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}
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#endif
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/* Invoking the exit handler.*/
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_default_exit();
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}
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/** @} */
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