diff options
Diffstat (limited to 'Projects/P-NUCLEO-WB55.Nucleo/Examples_LL/RNG/RNG_GenerateRandomNumbers/SW4STM32/startup_stm32wb55xx_cm4.s')
| -rw-r--r-- | Projects/P-NUCLEO-WB55.Nucleo/Examples_LL/RNG/RNG_GenerateRandomNumbers/SW4STM32/startup_stm32wb55xx_cm4.s | 92 |
1 files changed, 47 insertions, 45 deletions
diff --git a/Projects/P-NUCLEO-WB55.Nucleo/Examples_LL/RNG/RNG_GenerateRandomNumbers/SW4STM32/startup_stm32wb55xx_cm4.s b/Projects/P-NUCLEO-WB55.Nucleo/Examples_LL/RNG/RNG_GenerateRandomNumbers/SW4STM32/startup_stm32wb55xx_cm4.s index ffb0d9d09..f79eec117 100644 --- a/Projects/P-NUCLEO-WB55.Nucleo/Examples_LL/RNG/RNG_GenerateRandomNumbers/SW4STM32/startup_stm32wb55xx_cm4.s +++ b/Projects/P-NUCLEO-WB55.Nucleo/Examples_LL/RNG/RNG_GenerateRandomNumbers/SW4STM32/startup_stm32wb55xx_cm4.s @@ -14,29 +14,13 @@ ****************************************************************************** * @attention * - * <h2><center>© COPYRIGHT(c) 2019 STMicroelectronics</center></h2> + * <h2><center>© Copyright (c) 2019 STMicroelectronics. + * All rights reserved.</center></h2> * - * Redistribution and use in source and binary forms, with or without modification, - * are permitted provided that the following conditions are met: - * 1. Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright notice, - * this list of conditions and the following disclaimer in the documentation - * and/or other materials provided with the distribution. - * 3. Neither the name of STMicroelectronics nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" - * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE - * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR - * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER - * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, - * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * This software component is licensed by ST under BSD 3-Clause license, + * the "License"; You may not use this file except in compliance with the + * License. You may obtain a copy of the License at: + * opensource.org/licenses/BSD-3-Clause * ****************************************************************************** */ @@ -60,21 +44,29 @@ defined in linker script */ .word _sbss /* end address for the .bss section. defined in linker script */ .word _ebss - - .section .text.Reset_Handler - .weak Reset_Handler - .type Reset_Handler, %function -Reset_Handler: - ldr r0, =_estack - mov sp, r0 /* set stack pointer */ - -/* Copy the data segment initializers from flash to SRAM */ - ldr r0, =_sdata - ldr r1, =_edata - ldr r2, =_sidata +/* start address for the .MB_MEM2 section. defined in linker script */ +.word _sMB_MEM2 +/* end address for the .MB_MEM2 section. defined in linker script */ +.word _eMB_MEM2 + +/* INIT_BSS macro is used to fill the specified region [start : end] with zeros */ +.macro INIT_BSS start, end + ldr r0, =\start + ldr r1, =\end + movs r3, #0 + bl LoopFillZerobss +.endm + +/* INIT_DATA macro is used to copy data in the region [start : end] starting from 'src' */ +.macro INIT_DATA start, end, src + ldr r0, =\start + ldr r1, =\end + ldr r2, =\src movs r3, #0 - b LoopCopyDataInit + bl LoopCopyDataInit +.endm +.section .text.data_initializers CopyDataInit: ldr r4, [r2, r3] str r4, [r0, r3] @@ -83,21 +75,31 @@ CopyDataInit: LoopCopyDataInit: adds r4, r0, r3 cmp r4, r1 - bcc CopyDataInit - -/* Zero fill the bss segment. */ - ldr r2, =_sbss - ldr r4, =_ebss - movs r3, #0 - b LoopFillZerobss + bcc CopyDataInit + bx lr FillZerobss: - str r3, [r2] - adds r2, r2, #4 + str r3, [r0] + adds r0, r0, #4 LoopFillZerobss: - cmp r2, r4 + cmp r0, r1 bcc FillZerobss + bx lr + + .section .text.Reset_Handler + .weak Reset_Handler + .type Reset_Handler, %function +Reset_Handler: + ldr r0, =_estack + mov sp, r0 /* set stack pointer */ + +/* Copy the data segment initializers from flash to SRAM */ + INIT_DATA _sdata, _edata, _sidata + +/* Zero fill the bss segments. */ + INIT_BSS _sbss, _ebss + INIT_BSS _sMB_MEM2, _eMB_MEM2 /* Call the clock system intitialization function.*/ bl SystemInit |