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65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift open source project
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//
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// Copyright (c) 2024 Apple Inc. and the Swift project authors.
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#include <stddef.h>
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#include <stdint.h>
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int main(int argc, char *argv[]);
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void qemu_exit(void);
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int puts(const char *);
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__attribute__((noreturn))
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void reset(void) {
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main(0, NULL);
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qemu_exit();
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__builtin_trap();
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}
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void interrupt(void) {
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puts("INTERRUPT\n");
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qemu_exit();
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while (1) {
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}
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}
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__attribute__((aligned(4))) char stack[8192];
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__attribute((used))
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__attribute((section(".vectors"))) void *vector_table[114] = {
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(void *)&stack[8192 - 4], // initial SP
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reset, // Reset
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interrupt, // NMI
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interrupt, // HardFault
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interrupt, // MemManage
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interrupt, // BusFault
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interrupt, // UsageFault
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0 // NULL for all the other handlers
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};
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void qemu_exit() {
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__asm__ volatile("mov r0, #0x18");
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__asm__ volatile("movw r1, #0x0026");
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__asm__ volatile("movt r1, #0x2"); // construct 0x20026 in r1
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__asm__ volatile("bkpt #0xab");
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}
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int putchar(int c) {
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// This is only valid in an emulator (QEMU), and it's skipping a proper configuration of the UART device
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// and waiting for a "ready to transit" state.
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// STM32F4 specific location of USART1 and its DR register
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*(volatile uint32_t *)(0x40011000 + 0x04) = c;
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return c;
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}
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