67 lines
2.1 KiB
ArmAsm
67 lines
2.1 KiB
ArmAsm
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/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2018 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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.syntax unified
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.cpu cortex-m4
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.thumb
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.section .text.Reset_Handler
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.global Reset_Handler
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.type Reset_Handler, %function
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Reset_Handler:
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/* Load the stack pointer */
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ldr sp, =_estack
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/* Initialise the data section */
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ldr r1, =_sidata
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ldr r2, =_sdata
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ldr r3, =_edata
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b .data_copy_entry
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.data_copy_loop:
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ldr r0, [r1], #4 /* Should be 4-aligned to be as fast as possible */
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str r0, [r2], #4
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.data_copy_entry:
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cmp r2, r3
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bcc .data_copy_loop
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/* Zero out the BSS section */
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movs r0, #0
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ldr r1, =_sbss
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ldr r2, =_ebss
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b .bss_zero_entry
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.bss_zero_loop:
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str r0, [r1], #4 /* Should be 4-aligned to be as fast as possible */
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.bss_zero_entry:
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cmp r1, r2
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bcc .bss_zero_loop
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/* Initialise the system and jump to the main code */
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bl SystemInit
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b main
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.size Reset_Handler, .-Reset_Handler
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