// Generic Cortex-M interrupt vector.
// This vector is used by the QEMU target.

.syntax unified

// This is a convenience function for QEMU semihosting support.
// At some point, this should be replaced by inline assembly.
.section .text.SemihostingCall
.global  SemihostingCall
.type    SemihostingCall, %function
SemihostingCall:
    bkpt 0xab
    bx   lr

// This is the default handler for interrupts, if triggered but not defined.
.section .text.Default_Handler
.global  Default_Handler
.type    Default_Handler, %function
Default_Handler:
    wfe
    b    Default_Handler

// Avoid the need for repeated .weak and .set instructions.
.macro IRQ handler
    .weak  \handler
    .set   \handler, Default_Handler
.endm

.section .isr_vector, "a", %progbits
.global  __isr_vector
    // Interrupt vector as defined by Cortex-M, starting with the stack top.
    // On reset, SP is initialized with *0x0 and PC is loaded with *0x4, loading
    // _stack_top and Reset_Handler.
    .long _stack_top
    .long Reset_Handler
    .long NMI_Handler
    .long HardFault_Handler
    .long MemoryManagement_Handler
    .long BusFault_Handler
    .long UsageFault_Handler
    .long 0
    .long 0
    .long 0
    .long 0
    .long SVC_Handler
    .long DebugMon_Handler
    .long 0
    .long PendSV_Handler
    .long SysTick_Handler

    // Define default implementations for interrupts, redirecting to
    // Default_Handler when not implemented.
    IRQ NMI_Handler
    IRQ HardFault_Handler
    IRQ MemoryManagement_Handler
    IRQ BusFault_Handler
    IRQ UsageFault_Handler
    IRQ SVC_Handler
    IRQ DebugMon_Handler
    IRQ PendSV_Handler
    IRQ SysTick_Handler