aboutsummaryrefslogtreecommitdiffhomepage
path: root/targets/cortex-m-qemu.s
blob: 685c7fd5c8c0aefde79965df1e316c34c4b7d975 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
// Generic Cortex-M interrupt vector.
// This vector is used by the Cortex-M QEMU target.

.cfi_sections .debug_frame
.syntax unified

// 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:
    .cfi_startproc
    wfe
    b    Default_Handler
    .cfi_endproc
.size Default_Handler, .-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
__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

.size __isr_vector, .-__isr_vector