// Copyright 2020 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.

#include "pw_boot_armv7m/boot.h"

namespace {
// Default handler to insert into the ARMv7-M vector table (below).
// This function exists for convenience. If a device isn't doing what you
// expect, it might have hit a fault and ended up here.
void DefaultFaultHandler(void) {
  while (true) {
    // Wait for debugger to attach.
  }
}

// This is the device's interrupt vector table. It's not referenced in any
// code because the platform (STM32F4xx) expects this table to be present at the
// beginning of flash. The exact address is specified in the pw_boot_armv7m
// configuration as part of the target config.
//
// For more information, see ARMv7-M Architecture Reference Manual DDI 0403E.b
// section B1.5.3.

// This typedef is for convenience when building the vector table. With the
// exception of SP_main (0th entry in the vector table), all the entries of the
// vector table are function pointers.
typedef void (*InterruptHandler)();

PW_KEEP_IN_SECTION(".vector_table")
const InterruptHandler vector_table[] = {
    // The starting location of the stack pointer.
    // This address is NOT an interrupt handler/function pointer, it is simply
    // the address that the main stack pointer should be initialized to. The
    // value is reinterpret casted because it needs to be in the vector table.
    [0] = reinterpret_cast<InterruptHandler>(&pw_stack_high_addr),

    // Reset handler, dictates how to handle reset interrupt. This is the
    // address that the Program Counter (PC) is initialized to at boot.
    [1] = pw_BootEntry,

    // NMI handler.
    [2] = DefaultFaultHandler,
    // HardFault handler.
    [3] = DefaultFaultHandler,
};
}  // namespace