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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2023 Alessandro Gatti
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include "uart.h"
extern void set_interrupt_table(void);
extern int main(int argc, char **argv);
void _entry_point(void) {
// Set interrupt table
set_interrupt_table();
// Enable UART
uart_init();
// Now that we have a basic system up and running we can call main
main(0, 0);
// Finished
exit(0);
}
void exit(int status) {
uint32_t semihosting_arguments[2] = { 0 };
// Exit via QEMU's RISC-V semihosting support.
__asm volatile (
".option push \n" // Transient options
".option norvc \n" // Do not emit compressed instructions
".align 4 \n" // 16 bytes alignment
"mv a1, %0 \n" // Load buffer
"li t0, 0x20026 \n" // ADP_Stopped_ApplicationExit
"sw t0, 0(a1) \n" // ADP_Stopped_ApplicationExit
"sw %1, 4(a1) \n" // Exit code
"addi a0, zero, 0x20 \n" // TARGET_SYS_EXIT_EXTENDED
"slli zero, zero, 0x1F \n" // Entry NOP
"ebreak \n" // Give control to the debugger
"srai zero, zero, 7 \n" // Semihosting call
".option pop \n" // Restore previous options set
:
: "r" (semihosting_arguments), "r" (status)
: "memory"
);
// Should never reach here.
for (;;) {
}
}
#ifndef NDEBUG
void __assert_func(const char *file, int line, const char *func, const char *expr) {
(void)func;
printf("Assertion '%s' failed, at file %s:%d\n", expr, file, line);
exit(1);
}
#endif
// Picolibc requires `stdout` to be explicitly defined.
#ifdef _PICOLIBC__
FILE *const stdout;
#endif
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