.syntax unified
.thumb
.section .text

/* ======================= HARD FAULT ======================= */
.global HardFault_Handler
.type   HardFault_Handler, %function
HardFault_Handler:
    TST     LR, #4
    BNE     Fault_UsePSP
Fault_UseMSP:
    MRS     R0, MSP
    MOVS    R1, #0
    B       Fault_CallHandler
Fault_UsePSP:
    MRS     R0, PSP
    MOVS    R1, #1
Fault_CallHandler:
    MOVS    R2, #1              // HARD_RESET_HARD_FAULT
    LDR     R3, =HardReset_C_Handler
    BX      R3
.size   HardFault_Handler, . - HardFault_Handler