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/*
ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file GCC/crt0.S
* @brief Generic PowerPC startup file for GCC.
*
* @addtogroup PPC_GCC_CORE
* @{
*/
/*===========================================================================*/
/* Module constants. */
/*===========================================================================*/
#if !defined(FALSE) || defined(__DOXYGEN__)
#define FALSE 0
#endif
#if !defined(TRUE) || defined(__DOXYGEN__)
#define TRUE 1
#endif
#if defined(__HIGHTEC__)
#define se_bge bge
#endif
/*===========================================================================*/
/* Module pre-compile time settings. */
/*===========================================================================*/
/**
* @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
/*===========================================================================*/
/* Code section. */
/*===========================================================================*/
#if !defined(__DOXYGEN__)
.section .crt0, "ax"
.align 2
.globl _boot_address
.type _boot_address, @function
_boot_address:
/* Stack setup.*/
e_lis r1, __process_stack_end__@h
e_or2i r1, __process_stack_end__@l
se_li r0, 0
e_stwu r0, -8(r1)
/* Small sections registers initialization.*/
e_lis r2, __sdata2_start__@h
e_or2i r2, __sdata2_start__@l
e_lis r13, __sdata_start__@h
e_or2i r13, __sdata_start__@l
/* Early initialization.*/
e_bl __early_init
#if CRT0_INIT_STACKS == TRUE
/* Stacks fill pattern.*/
e_lis r7, CRT0_STACKS_FILL_PATTERN@h
e_or2i r7, CRT0_STACKS_FILL_PATTERN@l
/* IRQ Stack initialization. Note, the architecture does not use this
stack, the size is usually zero. An OS can have special SW handling
and require this. A 4 bytes alignment is assmend and required.*/
e_lis r4, __irq_stack_base__@h
e_or2i r4, __irq_stack_base__@l
e_lis r5, __irq_stack_end__@h
e_or2i r5, __irq_stack_end__@l
.irqsloop:
se_cmpl r4, r5
se_bge .irqsend
se_stw r7, 0(r4)
se_addi r4, 4
se_b .irqsloop
.irqsend:
/* Process Stack initialization. Note, does not overwrite the already
written EABI frame. A 4 bytes alignment is assmend and required.*/
e_lis r4, __process_stack_base__@h
e_or2i r4, __process_stack_base__@l
e_lis r5, (__process_stack_end__ - 8)@h
e_or2i r5, (__process_stack_end__ - 8)@l
.prcsloop:
se_cmpl r4, r5
se_bge .prcsend
se_stw r7, 0(r4)
se_addi r4, 4
se_b .prcsloop
.prcsend:
#endif
#if CRT0_INIT_BSS == TRUE
/* BSS clearing.*/
e_lis r4, __bss_start__@h
e_or2i r4, __bss_start__@l
e_lis r5, __bss_end__@h
e_or2i r5, __bss_end__@l
se_li r7, 0
.bssloop:
se_cmpl r4, r5
se_bge .bssend
se_stw r7, 0(r4)
se_addi r4, 4
se_b .bssloop
.bssend:
#endif
#if CRT0_INIT_DATA == TRUE
/* DATA initialization.*/
e_lis r4, __romdata_start__@h
e_or2i r4, __romdata_start__@l
e_lis r5, __data_start__@h
e_or2i r5, __data_start__@l
e_lis r6, __data_end__@h
e_or2i r6, __data_end__@l
.dataloop:
se_cmpl r5, r6
se_bge .dataend
se_lwz r7, 0(r4)
se_addi r4, 4
se_stw r7, 0(r5)
se_addi r5, 4
se_b .dataloop
.dataend:
#endif
/* Late initialization.*/
e_bl __late_init
#if CRT0_CALL_CONSTRUCTORS == TRUE
/* Constructors invocation.*/
e_lis r4, __init_array_start@h
e_or2i r4, __init_array_start@l
e_lis r5, __init_array_end@h
e_or2i r5, __init_array_end@l
.iniloop:
se_cmpl r4, r5
se_bge .iniend
se_lwz r6, 0(r4)
mtctr r6
se_addi r4, 4
se_bctrl
se_b .iniloop
.iniend:
#endif
/* Main program invocation.*/
e_bl main
#if CRT0_CALL_DESTRUCTORS == TRUE
/* Destructors invocation.*/
e_lis r4, __fini_array_start@h
e_or2i r4, __fini_array_start@l
e_lis r5, __fini_array_end@h
e_or2i r5, __fini_array_end@l
.finiloop:
se_cmpl r4, r5
se_bge .finiend
se_lwz r6, 0(r4)
mtctr r6
se_addi r4, 4
se_bctrl
se_b .finiloop
.finiend:
#endif
/* Branching to the defined exit handler.*/
e_b __default_exit
/* Default main exit code, infinite loop.*/
.weak __default_exit
.type __default_exit, @function
__default_exit:
e_b __default_exit
/* Default early initialization code, none.*/
.weak __early_init
.type __early_init, @function
__early_init:
se_blr
/* Default late initialization code, none.*/
.weak __late_init
.type __late_init, @function
__late_init:
se_blr
#endif /* !defined(__DOXYGEN__) */
/** @} */
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