HAL for ARMv7 Cortex-M based targets

ARMv7m HAL layer supports microcontrollers based on ARM Cortex-Mx architecture. Source code is located in hal/armv7m directory.

Initialization

_init_vectors:
.word _end + 1024 + 256
.word _start

First two words on memory address 0x00000000 define initial stack and code entry point. Stack is set at the end of BSS + size of the stack.

.word _exceptions_dispatch /* NMI */
.word _exceptions_dispatch /* HardFault */
.word _exceptions_dispatch /* MemMgtFault */
.word _exceptions_dispatch /* BusFault */
.word _exceptions_dispatch /* UsageFault */
.word 0
.word 0
.word 0
.word 0
.word _exceptions_dispatch /* SVC */
.word _exceptions_dispatch /* Debug */
.word 0
.word _interrupts_dispatch /* PendSV */
.word _interrupts_dispatch /* Systick */
(..)

Next memory part defines exception and interrupt handlers.

_start:
  cpsid if
  bl _stm32_init
  ldr r0, =_edata
  bl main

See also

1. Kernel - HAL Subsystem
2. Kernel - HAL for ARMv7 Cortex-A based targets
3. Kernel - HAL for IA32 targets
4. Kernel - HAL for RISC-V 64 based targets
5. Kernel - HAL for SPARCv8 LEON3 based targets
6. Table of Contents