You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
245 lines
7.3 KiB
ArmAsm
245 lines
7.3 KiB
ArmAsm
/*
|
|
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
|
|
|
|
/*===========================================================================*/
|
|
/* 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__)
|
|
|
|
.vle
|
|
|
|
.section .crt0, "axv"
|
|
.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__) */
|
|
|
|
/** @} */
|