272 lines
6.5 KiB
C
272 lines
6.5 KiB
C
/*
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* Copyright (c) 2016 Cadence Design Systems, Inc.
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <kernel.h>
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#include <arch/cpu.h>
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#include <kernel_structs.h>
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#include <inttypes.h>
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#include <kernel_arch_data.h>
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#include <misc/printk.h>
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#include <xtensa/specreg.h>
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const NANO_ESF _default_esf = {
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{0xdeaddead}, /* sp */
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0xdeaddead, /* pc */
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};
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/* Need to do this as a macro since regnum must be an immediate value */
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#define get_sreg(regnum_p) ({ \
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unsigned int retval; \
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__asm__ volatile( \
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"rsr %[retval], %[regnum]\n\t" \
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: [retval] "=r" (retval) \
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: [regnum] "i" (regnum_p)); \
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retval; \
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})
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/**
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*
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* @brief Fatal error handler
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*
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* This routine is called when fatal error conditions are detected by software
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* and is responsible only for reporting the error. Once reported, it then
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* invokes the user provided routine _SysFatalErrorHandler() which is
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* responsible for implementing the error handling policy.
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*
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* The caller is expected to always provide a usable ESF. In the event that the
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* fatal error does not have a hardware generated ESF, the caller should either
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* create its own or use a pointer to the global default ESF <_default_esf>.
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*
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* @param reason the reason that the handler was called
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* @param pEsf pointer to the exception stack frame
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*
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* @return This function does not return.
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*/
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FUNC_NORETURN void _NanoFatalErrorHandler(unsigned int reason,
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const NANO_ESF *pEsf)
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{
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switch (reason) {
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case _NANO_ERR_HW_EXCEPTION:
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case _NANO_ERR_RESERVED_IRQ:
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break;
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#if defined(CONFIG_STACK_CANARIES) || defined(CONFIG_STACK_SENTINEL)
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case _NANO_ERR_STACK_CHK_FAIL:
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printk("***** Stack Check Fail! *****\n");
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break;
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#endif /* CONFIG_STACK_CANARIES */
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case _NANO_ERR_ALLOCATION_FAIL:
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printk("**** Kernel Allocation Failure! ****\n");
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break;
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case _NANO_ERR_KERNEL_OOPS:
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printk("***** Kernel OOPS! *****\n");
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break;
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case _NANO_ERR_KERNEL_PANIC:
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printk("***** Kernel Panic! *****\n");
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break;
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default:
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printk("**** Unknown Fatal Error %d! ****\n", reason);
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break;
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}
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printk("Current thread ID = %p\n"
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"Faulting instruction address = 0x%x\n",
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k_current_get(),
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pEsf->pc);
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/*
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* Now that the error has been reported, call the user implemented
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* policy
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* to respond to the error. The decisions as to what responses are
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* appropriate to the various errors are something the customer must
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* decide.
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*/
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_SysFatalErrorHandler(reason, pEsf);
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}
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#ifdef CONFIG_PRINTK
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static char *cause_str(unsigned int cause_code)
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{
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switch (cause_code) {
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case 0:
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return "illegal instruction";
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case 1:
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return "syscall";
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case 2:
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return "instr fetch error";
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case 3:
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return "load/store error";
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case 4:
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return "level-1 interrupt";
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case 5:
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return "alloca";
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case 6:
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return "divide by zero";
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case 8:
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return "privileged";
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case 9:
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return "load/store alignment";
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case 12:
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return "instr PIF data error";
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case 13:
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return "load/store PIF data error";
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case 14:
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return "instr PIF addr error";
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case 15:
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return "load/store PIF addr error";
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case 16:
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return "instr TLB miss";
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case 17:
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return "instr TLB multi hit";
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case 18:
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return "instr fetch privilege";
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case 20:
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return "inst fetch prohibited";
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case 24:
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return "load/store TLB miss";
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case 25:
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return "load/store TLB multi hit";
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case 26:
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return "load/store privilege";
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case 28:
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return "load prohibited";
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case 29:
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return "store prohibited";
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case 32: case 33: case 34: case 35: case 36: case 37: case 38: case 39:
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return "coprocessor disabled";
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default:
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return "unknown/reserved";
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}
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}
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#endif
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static inline unsigned int get_bits(int offset, int num_bits, unsigned int val)
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{
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int mask;
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mask = (1 << num_bits) - 1;
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val = val >> offset;
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return val & mask;
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}
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static void dump_exc_state(void)
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{
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#ifdef CONFIG_PRINTK
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unsigned int cause, ps;
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cause = get_sreg(EXCCAUSE);
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ps = get_sreg(PS);
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printk("Exception cause %d (%s):\n"
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" EPC1 : 0x%08x EXCSAVE1 : 0x%08x EXCVADDR : 0x%08x\n",
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cause, cause_str(cause), get_sreg(EPC_1),
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get_sreg(EXCSAVE_1), get_sreg(EXCVADDR));
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printk("Program state (PS):\n"
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" INTLEVEL : %02d EXCM : %d UM : %d RING : %d WOE : %d\n",
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get_bits(0, 4, ps), get_bits(4, 1, ps), get_bits(5, 1, ps),
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get_bits(6, 2, ps), get_bits(18, 1, ps));
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#ifndef __XTENSA_CALL0_ABI__
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printk(" OWB : %02d CALLINC : %d\n",
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get_bits(8, 4, ps), get_bits(16, 2, ps));
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#endif
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#endif /* CONFIG_PRINTK */
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}
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FUNC_NORETURN void FatalErrorHandler(void)
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{
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printk("*** Unhandled exception ****\n");
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dump_exc_state();
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_NanoFatalErrorHandler(_NANO_ERR_HW_EXCEPTION, &_default_esf);
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}
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FUNC_NORETURN void ReservedInterruptHandler(unsigned int intNo)
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{
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printk("*** Reserved Interrupt ***\n");
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dump_exc_state();
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printk("INTENABLE = 0x%x\n"
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"INTERRUPT = 0x%x (%d)\n",
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get_sreg(INTENABLE), (1 << intNo), intNo);
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_NanoFatalErrorHandler(_NANO_ERR_RESERVED_IRQ, &_default_esf);
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}
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void exit(int return_code)
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{
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#ifdef XT_SIMULATOR
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__asm__ (
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"mov a3, %[code]\n\t"
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"movi a2, %[call]\n\t"
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"simcall\n\t"
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:
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: [code] "r" (return_code), [call] "i" (SYS_exit)
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: "a3", "a2");
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#else
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printk("exit(%d)\n", return_code);
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k_panic();
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#endif
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}
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/**
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*
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* @brief Fatal error handler
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*
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* This routine implements the corrective action to be taken when the system
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* detects a fatal error.
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*
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* This sample implementation attempts to abort the current thread and allow
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* the system to continue executing, which may permit the system to continue
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* functioning with degraded capabilities.
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*
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* System designers may wish to enhance or substitute this sample
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* implementation to take other actions, such as logging error (or debug)
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* information to a persistent repository and/or rebooting the system.
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*
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* @param reason the fatal error reason
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* @param pEsf pointer to exception stack frame
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*
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* @return N/A
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*/
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FUNC_NORETURN __weak void _SysFatalErrorHandler(unsigned int reason,
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const NANO_ESF *pEsf)
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{
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ARG_UNUSED(pEsf);
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#if !defined(CONFIG_SIMPLE_FATAL_ERROR_HANDLER)
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#ifdef CONFIG_STACK_SENTINEL
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if (reason == _NANO_ERR_STACK_CHK_FAIL) {
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goto hang_system;
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}
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#endif
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if (reason == _NANO_ERR_KERNEL_PANIC) {
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goto hang_system;
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}
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if (k_is_in_isr() || _is_thread_essential()) {
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printk("Fatal fault in %s! Spinning...\n",
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k_is_in_isr() ? "ISR" : "essential thread");
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goto hang_system;
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}
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printk("Fatal fault in thread %p! Aborting.\n", _current);
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k_thread_abort(_current);
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hang_system:
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#else
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ARG_UNUSED(reason);
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#endif
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#ifdef XT_SIMULATOR
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exit(255 - reason);
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#else
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for (;;) {
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k_cpu_idle();
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}
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#endif
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CODE_UNREACHABLE;
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}
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