1 // Copyright 2020 The Pigweed Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
5 // the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
13 // the License.
14
15 #include <stdbool.h>
16
17 #include "pw_boot/boot.h"
18 #include "pw_boot_cortex_m/boot.h"
19
20 // Default handler to insert into the ARMv7-M vector table (below).
21 // This function exists for convenience. If a device isn't doing what you
22 // expect, it might have hit a fault and ended up here.
DefaultFaultHandler(void)23 static void DefaultFaultHandler(void) {
24 while (true) {
25 // Wait for debugger to attach.
26 }
27 }
28
29 // This is the device's interrupt vector table. It's not referenced in any
30 // code because the platform (STM32F4xx) expects this table to be present at the
31 // beginning of flash. The exact address is specified in the pw_boot_cortex_m
32 // configuration as part of the target config.
33 //
34 // For more information, see ARMv7-M Architecture Reference Manual DDI 0403E.b
35 // section B1.5.3.
36
37 // This typedef is for convenience when building the vector table. With the
38 // exception of SP_main (0th entry in the vector table), all the entries of the
39 // vector table are function pointers.
40 typedef void (*InterruptHandler)(void);
41
42 PW_KEEP_IN_SECTION(".vector_table")
43 const InterruptHandler vector_table[] = {
44 // The starting location of the stack pointer.
45 // This address is NOT an interrupt handler/function pointer, it is simply
46 // the address that the main stack pointer should be initialized to. The
47 // value is reinterpret casted because it needs to be in the vector table.
48 [0] = (InterruptHandler)(&pw_boot_stack_high_addr),
49
50 // Reset handler, dictates how to handle reset interrupt. This is the
51 // address that the Program Counter (PC) is initialized to at boot.
52 [1] = pw_boot_Entry,
53
54 // NMI handler.
55 [2] = DefaultFaultHandler,
56 // HardFault handler.
57 [3] = DefaultFaultHandler,
58 };
59