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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/* Trap handler for QEMU virt machine (RV32 and RV64).
*
* mcause constants use __riscv_xlen to resolve correctly for both ISAs:
* RV32: interrupt bit = bit 31 (0x80000000)
* RV64: interrupt bit = bit 63 (0x8000000000000000)
*/
#include "csr.h"
#include <stdint.h>
#include "uart.h"
#include "hwtimer.h"
#include "plic.h"
#include <tx_port.h>
#include <tx_api.h>
#define MCAUSE_INT_BIT ((uintptr_t)1 << (__riscv_xlen - 1))
#define OS_IS_INTERRUPT(mcause) ((mcause) & MCAUSE_INT_BIT)
#define OS_IS_TICK_INT(mcause) ((mcause) == (MCAUSE_INT_BIT | 7u))
#define OS_IS_SOFT_INT(mcause) ((mcause) == (MCAUSE_INT_BIT | 3u))
#define OS_IS_EXT_INT(mcause) ((mcause) == (MCAUSE_INT_BIT | 11u))
#define OS_IS_TRAP_USER(mcause) ((mcause) == 11u)
extern void _tx_timer_interrupt(void);
#ifdef TX_RISCV_TRAP_DEBUG
static void print_hex(uintptr_t val)
{
const char digits[] = "0123456789ABCDEF";
uart_putc('0');
uart_putc('x');
for (int i = (int)(sizeof(uintptr_t) * 2) - 1; i >= 0; i--)
{
int d = (val >> (i * 4)) & 0xF;
uart_putc(digits[d]);
}
uart_putc('\n');
}
#endif /* TX_RISCV_TRAP_DEBUG */
void trap_handler(uintptr_t mcause, uintptr_t mepc, uintptr_t mtval)
{
if (OS_IS_INTERRUPT(mcause))
{
if (OS_IS_TICK_INT(mcause))
{
hwtimer_handler();
_tx_timer_interrupt();
}
else if (OS_IS_EXT_INT(mcause))
{
int ret = plic_irq_intr();
if (ret)
{
puts("[INTERRUPT]: handler irq error!");
while (1) ;
}
}
else
{
puts("[INTERRUPT]: now can't deal with the interrupt!");
while (1) ;
}
}
else
{
puts("[EXCEPTION] : Unknown Error!!");
#ifdef TX_RISCV_TRAP_DEBUG
puts("mcause:");
print_hex(mcause);
puts("mepc:");
print_hex(mepc);
puts("mtval:");
print_hex(mtval);
#else
(void)mepc;
(void)mtval;
#endif /* TX_RISCV_TRAP_DEBUG */
while (1) ;
}
}
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