377 lines
12 KiB
C
377 lines
12 KiB
C
/*
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* Copyright (c) 2006-2022, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2022-12-08 RT-Thread first version
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include <stdint.h>
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#include <mm_fault.h>
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#include "mmu.h"
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#include "encoding.h"
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#include "stack.h"
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#include "sbi.h"
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#include "riscv.h"
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#include "interrupt.h"
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#include "plic.h"
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#include "tick.h"
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#ifdef RT_USING_SMART
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#include <lwp_arch.h>
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#else
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#define rt_hw_backtrace(...) (0)
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#endif
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#define DBG_TAG "libcpu.trap"
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#define DBG_LVL DBG_INFO
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#include <rtdbg.h>
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void dump_regs(struct rt_hw_stack_frame *regs)
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{
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rt_kprintf("--------------Dump Registers-----------------\n");
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rt_kprintf("Function Registers:\n");
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rt_kprintf("\tra(x1) = 0x%p\tuser_sp = 0x%p\n", regs->ra, regs->user_sp_exc_stack);
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rt_kprintf("\tgp(x3) = 0x%p\ttp(x4) = 0x%p\n", regs->gp, regs->tp);
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rt_kprintf("Temporary Registers:\n");
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rt_kprintf("\tt0(x5) = 0x%p\tt1(x6) = 0x%p\n", regs->t0, regs->t1);
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rt_kprintf("\tt2(x7) = 0x%p\n", regs->t2);
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rt_kprintf("\tt3(x28) = 0x%p\tt4(x29) = 0x%p\n", regs->t3, regs->t4);
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rt_kprintf("\tt5(x30) = 0x%p\tt6(x31) = 0x%p\n", regs->t5, regs->t6);
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rt_kprintf("Saved Registers:\n");
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rt_kprintf("\ts0/fp(x8) = 0x%p\ts1(x9) = 0x%p\n", regs->s0_fp, regs->s1);
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rt_kprintf("\ts2(x18) = 0x%p\ts3(x19) = 0x%p\n", regs->s2, regs->s3);
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rt_kprintf("\ts4(x20) = 0x%p\ts5(x21) = 0x%p\n", regs->s4, regs->s5);
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rt_kprintf("\ts6(x22) = 0x%p\ts7(x23) = 0x%p\n", regs->s6, regs->s7);
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rt_kprintf("\ts8(x24) = 0x%p\ts9(x25) = 0x%p\n", regs->s8, regs->s9);
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rt_kprintf("\ts10(x26) = 0x%p\ts11(x27) = 0x%p\n", regs->s10, regs->s11);
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rt_kprintf("Function Arguments Registers:\n");
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rt_kprintf("\ta0(x10) = 0x%p\ta1(x11) = 0x%p\n", regs->a0, regs->a1);
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rt_kprintf("\ta2(x12) = 0x%p\ta3(x13) = 0x%p\n", regs->a2, regs->a3);
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rt_kprintf("\ta4(x14) = 0x%p\ta5(x15) = 0x%p\n", regs->a4, regs->a5);
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rt_kprintf("\ta6(x16) = 0x%p\ta7(x17) = 0x%p\n", regs->a6, regs->a7);
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rt_kprintf("sstatus = 0x%p\n", regs->sstatus);
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rt_kprintf("\t%s\n", (regs->sstatus & SSTATUS_SIE) ? "Supervisor Interrupt Enabled" : "Supervisor Interrupt Disabled");
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rt_kprintf("\t%s\n", (regs->sstatus & SSTATUS_SPIE) ? "Last Time Supervisor Interrupt Enabled" : "Last Time Supervisor Interrupt Disabled");
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rt_kprintf("\t%s\n", (regs->sstatus & SSTATUS_SPP) ? "Last Privilege is Supervisor Mode" : "Last Privilege is User Mode");
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rt_kprintf("\t%s\n", (regs->sstatus & SSTATUS_SUM) ? "Permit to Access User Page" : "Not Permit to Access User Page");
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rt_kprintf("\t%s\n", (regs->sstatus & (1 << 19)) ? "Permit to Read Executable-only Page" : "Not Permit to Read Executable-only Page");
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rt_size_t satp_v = read_csr(satp);
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rt_kprintf("satp = 0x%p\n", satp_v);
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rt_kprintf("\tCurrent Page Table(Physical) = 0x%p\n", __MASKVALUE(satp_v, __MASK(44)) << PAGE_OFFSET_BIT);
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rt_kprintf("\tCurrent ASID = 0x%p\n", __MASKVALUE(satp_v >> 44, __MASK(16)) << PAGE_OFFSET_BIT);
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const char *mode_str = "Unknown Address Translation/Protection Mode";
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switch (__MASKVALUE(satp_v >> 60, __MASK(4)))
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{
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case 0:
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mode_str = "No Address Translation/Protection Mode";
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break;
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case 8:
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mode_str = "Page-based 39-bit Virtual Addressing Mode";
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break;
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case 9:
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mode_str = "Page-based 48-bit Virtual Addressing Mode";
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break;
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}
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rt_kprintf("\tMode = %s\n", mode_str);
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rt_kprintf("-----------------Dump OK---------------------\n");
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}
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static const char *Exception_Name[] =
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{
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"Instruction Address Misaligned",
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"Instruction Access Fault",
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"Illegal Instruction",
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"Breakpoint",
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"Load Address Misaligned",
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"Load Access Fault",
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"Store/AMO Address Misaligned",
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"Store/AMO Access Fault",
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"Environment call from U-mode",
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"Environment call from S-mode",
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"Reserved-10",
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"Reserved-11",
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"Instruction Page Fault",
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"Load Page Fault",
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"Reserved-14",
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"Store/AMO Page Fault"};
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static const char *Interrupt_Name[] =
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{
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"User Software Interrupt",
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"Supervisor Software Interrupt",
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"Reversed-2",
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"Reversed-3",
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"User Timer Interrupt",
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"Supervisor Timer Interrupt",
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"Reversed-6",
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"Reversed-7",
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"User External Interrupt",
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"Supervisor External Interrupt",
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"Reserved-10",
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"Reserved-11",
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};
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extern struct rt_irq_desc irq_desc[];
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#ifndef RT_USING_SMP
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static volatile int nested = 0;
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#define ENTER_TRAP \
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nested += 1
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#define EXIT_TRAP \
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nested -= 1
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#define CHECK_NESTED_PANIC(cause, tval, epc, eframe) \
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if (nested != 1) \
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handle_nested_trap_panic(cause, tval, epc, eframe)
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#endif /* RT_USING_SMP */
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static const char *get_exception_msg(int id)
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{
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const char *msg;
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if (id < sizeof(Exception_Name) / sizeof(const char *))
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{
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msg = Exception_Name[id];
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}
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else
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{
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msg = "Unknown Exception";
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}
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return msg;
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}
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#ifdef RT_USING_SMART
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#include "lwp.h"
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void handle_user(rt_size_t scause, rt_size_t stval, rt_size_t sepc, struct rt_hw_stack_frame *sp)
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{
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rt_size_t id = __MASKVALUE(scause, __MASK(63UL));
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struct rt_lwp *lwp;
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/* user page fault */
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enum rt_mm_fault_op fault_op;
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enum rt_mm_fault_type fault_type;
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switch (id)
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{
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case EP_LOAD_PAGE_FAULT:
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fault_op = MM_FAULT_OP_READ;
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fault_type = MM_FAULT_TYPE_PAGE_FAULT;
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break;
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case EP_LOAD_ACCESS_FAULT:
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fault_op = MM_FAULT_OP_READ;
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fault_type = MM_FAULT_TYPE_ACCESS_FAULT;
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break;
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case EP_LOAD_ADDRESS_MISALIGNED:
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fault_op = MM_FAULT_OP_READ;
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fault_type = MM_FAULT_TYPE_BUS_ERROR;
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break;
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case EP_STORE_PAGE_FAULT:
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fault_op = MM_FAULT_OP_WRITE;
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fault_type = MM_FAULT_TYPE_PAGE_FAULT;
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break;
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case EP_STORE_ACCESS_FAULT:
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fault_op = MM_FAULT_OP_WRITE;
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fault_type = MM_FAULT_TYPE_ACCESS_FAULT;
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break;
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case EP_STORE_ADDRESS_MISALIGNED:
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fault_op = MM_FAULT_OP_WRITE;
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fault_type = MM_FAULT_TYPE_BUS_ERROR;
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break;
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case EP_INSTRUCTION_PAGE_FAULT:
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fault_op = MM_FAULT_OP_EXECUTE;
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fault_type = MM_FAULT_TYPE_PAGE_FAULT;
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break;
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case EP_INSTRUCTION_ACCESS_FAULT:
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fault_op = MM_FAULT_OP_EXECUTE;
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fault_type = MM_FAULT_TYPE_ACCESS_FAULT;
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break;
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case EP_INSTRUCTION_ADDRESS_MISALIGNED:
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fault_op = MM_FAULT_OP_EXECUTE;
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fault_type = MM_FAULT_TYPE_BUS_ERROR;
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break;
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default:
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fault_op = 0;
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}
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if (fault_op)
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{
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rt_base_t saved_stat;
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lwp = lwp_self();
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struct rt_aspace_fault_msg msg = {
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.fault_op = fault_op,
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.fault_type = fault_type,
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.fault_vaddr = (void *)stval,
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};
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__asm__ volatile ("csrrsi %0, sstatus, 2":"=r"(saved_stat));
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if (lwp && rt_aspace_fault_try_fix(lwp->aspace, &msg))
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{
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__asm__ volatile ("csrw sstatus, %0"::"r"(saved_stat));
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return;
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}
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__asm__ volatile ("csrw sstatus, %0"::"r"(saved_stat));
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}
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LOG_E("[FATAL ERROR] Exception %ld:%s\n", id, get_exception_msg(id));
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LOG_E("scause:0x%p,stval:0x%p,sepc:0x%p\n", scause, stval, sepc);
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dump_regs(sp);
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rt_thread_t cur_thr = rt_thread_self();
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struct rt_hw_backtrace_frame frame = {
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.fp = sp->s0_fp,
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.pc = sepc
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};
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rt_kprintf("fp = %p\n", frame.fp);
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lwp_backtrace_frame(cur_thr, &frame);
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LOG_E("User Fault, killing thread: %s", cur_thr->parent.name);
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EXIT_TRAP;
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sys_exit_group(-1);
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}
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#endif
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#ifdef ENABLE_VECTOR
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static void vector_enable(struct rt_hw_stack_frame *sp)
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{
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sp->sstatus |= SSTATUS_VS_INITIAL;
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}
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/**
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* detect V/D support, and do not distinguish V/D instruction
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*/
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static int illegal_inst_recoverable(rt_ubase_t stval, struct rt_hw_stack_frame *sp)
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{
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// first 7 bits is opcode
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int opcode = stval & 0x7f;
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int csr = (stval & 0xFFF00000) >> 20;
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// ref riscv-v-spec-1.0, [Vector Instruction Formats]
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int width = ((stval & 0x7000) >> 12) - 1;
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int flag = 0;
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switch (opcode)
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{
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case 0x57: // V
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case 0x27: // scalar FLOAT
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case 0x07:
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case 0x73: // CSR
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flag = 1;
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break;
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}
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if (flag)
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{
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vector_enable(sp);
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}
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return flag;
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}
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#endif
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static void handle_nested_trap_panic(
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rt_size_t cause,
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rt_size_t tval,
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rt_size_t epc,
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struct rt_hw_stack_frame *eframe)
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{
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LOG_E("\n-------- [SEVER ERROR] --------");
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LOG_E("Nested trap detected");
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LOG_E("scause:0x%p,stval:0x%p,sepc:0x%p\n", cause, tval, epc);
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dump_regs(eframe);
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rt_hw_cpu_shutdown();
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}
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#define IN_USER_SPACE (stval >= USER_VADDR_START && stval < USER_VADDR_TOP)
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#define PAGE_FAULT (id == EP_LOAD_PAGE_FAULT || id == EP_STORE_PAGE_FAULT)
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/* Trap entry */
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void handle_trap(rt_size_t scause, rt_size_t stval, rt_size_t sepc, struct rt_hw_stack_frame *sp)
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{
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ENTER_TRAP;
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rt_size_t id = __MASKVALUE(scause, __MASK(63UL));
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const char *msg;
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/* supervisor external interrupt */
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if (scause == (uint64_t)(0x8000000000000005))
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{
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rt_interrupt_enter();
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tick_isr();
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rt_interrupt_leave();
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}
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else if (scause == (uint64_t)(0x8000000000000009))
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{
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rt_interrupt_enter();
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int plic_irq = plic_claim();
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plic_complete(plic_irq);
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irq_desc[plic_irq].handler(plic_irq, irq_desc[plic_irq].param);
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rt_interrupt_leave();
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}
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else
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{
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// trap cannot nested when handling another trap / interrupt
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CHECK_NESTED_PANIC(scause, stval, sepc, sp);
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rt_size_t id = __MASKVALUE(scause, __MASK(63UL));
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const char *msg;
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if (scause >> 63)
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{
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if (id < sizeof(Interrupt_Name) / sizeof(const char *))
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{
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msg = Interrupt_Name[id];
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}
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else
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{
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msg = "Unknown Interrupt";
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}
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rt_kprintf("Unhandled Interrupt %ld:%s\n", id, msg);
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}
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else
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{
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#ifdef ENABLE_VECTOR
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if (scause == 0x2)
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{
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if (!(sp->sstatus & SSTATUS_VS) && illegal_inst_recoverable(stval, sp))
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goto _exit;
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}
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#endif /* ENABLE_VECTOR */
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#ifdef RT_USING_SMART
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if (!(sp->sstatus & 0x100) || (PAGE_FAULT && IN_USER_SPACE))
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{
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handle_user(scause, stval, sepc, sp);
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// if handle_user() return here, jump to u mode then
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goto _exit;
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}
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#endif
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// handle kernel exception:
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rt_kprintf("Unhandled Exception %ld:%s\n", id, get_exception_msg(id));
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}
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rt_kprintf("scause:0x%p,stval:0x%p,sepc:0x%p\n", scause, stval, sepc);
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dump_regs(sp);
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rt_kprintf("--------------Thread list--------------\n");
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rt_kprintf("current thread: %s\n", rt_thread_self()->parent.name);
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extern struct rt_thread *rt_current_thread;
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rt_kprintf("--------------Backtrace--------------\n");
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struct rt_hw_backtrace_frame frame = {
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.fp = sp->s0_fp,
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.pc = sepc
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};
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rt_kprintf("fp = %p", frame.fp);
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rt_backtrace_frame(&frame);
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RT_ASSERT(0);
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}
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_exit:
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EXIT_TRAP;
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return ;
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}
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