| 0,0 → 1,137 |
|---|
| /* |
| * Copyright (C) 2003-2004 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <arch/exception.h> |
| #include <arch/interrupt.h> |
| #include <panic.h> |
| #include <arch/cp0.h> |
| #include <arch/types.h> |
| #include <arch.h> |
| #include <debug.h> |
| #include <proc/thread.h> |
| |
| void exception(struct exception_regdump *pstate) |
| { |
| int cause; |
| int excno; |
| __u32 epc_shift = 0; |
| |
| ASSERT(CPU != NULL); |
| |
| /* |
| * NOTE ON OPERATION ORDERING |
| * |
| * On entry, interrupts_disable() must be called before |
| * exception bit is cleared. |
| */ |
| |
| interrupts_disable(); |
| cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit | |
| cp0_status_um_bit)); |
| |
| /* Save pstate so that the threads can access it */ |
| /* If THREAD->pstate is set, this is nested exception, |
| * do not rewrite it |
| */ |
| if (THREAD && !THREAD->pstate) |
| THREAD->pstate = pstate; |
| |
| cause = cp0_cause_read(); |
| excno = cp0_cause_excno(cause); |
| /* decode exception number and process the exception */ |
| switch (excno) { |
| case EXC_Int: |
| interrupt(pstate); |
| break; |
| case EXC_TLBL: |
| case EXC_TLBS: |
| tlb_invalid(pstate); |
| break; |
| case EXC_CpU: |
| #ifdef CONFIG_FPU_LAZY |
| if (cp0_cause_coperr(cause) == fpu_cop_id) |
| scheduler_fpu_lazy_request(); |
| else |
| #endif |
| panic("unhandled Coprocessor Unusable Exception\n"); |
| break; |
| case EXC_Mod: |
| tlb_modified(pstate); |
| break; |
| case EXC_AdEL: |
| panic("unhandled Address Error Exception - load or instruction fetch\n"); |
| break; |
| case EXC_AdES: |
| panic("unhandled Address Error Exception - store\n"); |
| break; |
| case EXC_IBE: |
| panic("unhandled Bus Error Exception - fetch instruction\n"); |
| break; |
| case EXC_DBE: |
| panic("unhandled Bus Error Exception - data reference: load or store\n"); |
| break; |
| case EXC_Bp: |
| /* it is necessary to not re-execute BREAK instruction after returning from Exception handler |
| (see page 138 in R4000 Manual for more information) */ |
| epc_shift = 4; |
| break; |
| case EXC_RI: |
| panic("unhandled Reserved Instruction Exception\n"); |
| break; |
| case EXC_Ov: |
| panic("unhandled Arithmetic Overflow Exception\n"); |
| break; |
| case EXC_Tr: |
| panic("unhandled Trap Exception\n"); |
| break; |
| case EXC_VCEI: |
| panic("unhandled Virtual Coherency Exception - instruction\n"); |
| break; |
| case EXC_FPE: |
| panic("unhandled Floating-Point Exception\n"); |
| break; |
| case EXC_WATCH: |
| panic("unhandled reference to WatchHi/WatchLo address\n"); |
| break; |
| case EXC_VCED: |
| panic("unhandled Virtual Coherency Exception - data\n"); |
| break; |
| default: |
| panic("unhandled exception %d\n", excno); |
| } |
| |
| pstate->epc += epc_shift; |
| /* Set to NULL, so that we can still support nested |
| * exceptions |
| * TODO: We should probably set EXL bit before this command, |
| * nesting. On the other hand, if some exception occurs between |
| * here and ERET, it won't set anything on the pstate anyway. |
| */ |
| if (THREAD) |
| THREAD->pstate = NULL; |
| } |