diff options
| -rw-r--r-- | ports/stm32/Makefile | 1 | ||||
| -rw-r--r-- | ports/stm32/resethandler.s | 66 |
2 files changed, 67 insertions, 0 deletions
diff --git a/ports/stm32/Makefile b/ports/stm32/Makefile index 66582058a..0e7f7f71a 100644 --- a/ports/stm32/Makefile +++ b/ports/stm32/Makefile @@ -252,6 +252,7 @@ SRC_C = \ SRC_O = \ $(STARTUP_FILE) \ + resethandler.o \ gchelper.o \ SRC_HAL = $(addprefix $(HAL_DIR)/Src/stm32$(MCU_SERIES)xx_,\ diff --git a/ports/stm32/resethandler.s b/ports/stm32/resethandler.s new file mode 100644 index 000000000..6c37260dc --- /dev/null +++ b/ports/stm32/resethandler.s @@ -0,0 +1,66 @@ +/* + * This file is part of the MicroPython project, http://micropython.org/ + * + * The MIT License (MIT) + * + * Copyright (c) 2018 Damien P. George + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + + .syntax unified + .cpu cortex-m4 + .thumb + + .section .text.Reset_Handler + .global Reset_Handler + .type Reset_Handler, %function + +Reset_Handler: + /* Load the stack pointer */ + ldr sp, =_estack + + /* Initialise the data section */ + ldr r1, =_sidata + ldr r2, =_sdata + ldr r3, =_edata + b .data_copy_entry +.data_copy_loop: + ldr r0, [r1], #4 /* Should be 4-aligned to be as fast as possible */ + str r0, [r2], #4 +.data_copy_entry: + cmp r2, r3 + bcc .data_copy_loop + + /* Zero out the BSS section */ + movs r0, #0 + ldr r1, =_sbss + ldr r2, =_ebss + b .bss_zero_entry +.bss_zero_loop: + str r0, [r1], #4 /* Should be 4-aligned to be as fast as possible */ +.bss_zero_entry: + cmp r1, r2 + bcc .bss_zero_loop + + /* Initialise the system and jump to the main code */ + bl SystemInit + b main + + .size Reset_Handler, .-Reset_Handler |