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[/] [or1k/] [tags/] [nog_patch_49/] [or1ksim/] [cpu/] [or1k/] [except.c] - Rev 123
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/* except.c -- Simulation of OR1K exceptions Copyright (C) 1999 Damjan Lampret, lampret@opencores.org This file is part of OpenRISC 1000 Architectural Simulator. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <stdlib.h> #include <stdio.h> #include <string.h> #include "abstract.h" #include "except.h" #include "sprs.h" extern int cont_run; extern struct iqueue_entry iqueue[20]; extern unsigned long pc; extern unsigned long pcnext; extern unsigned long pc_phy; extern struct iqueue_entry iqueue[]; extern int delay_insn; int cycle_delay = 0; /* Added by CZ 27/05/01 */ /* Handle OR1K exceptions. */ void except_handle(int except, unsigned long ea) { unsigned long pc_saved; printf("Exception 0x%x (%s): ", except, EXCEPT_NAME(except)); printf("Iqueue[0].insn_addr: 0x%x Eff ADDR: 0x%x\n", iqueue[0].insn_addr, ea); printf(" pc: 0x%x pcnext: 0x%x\n", pc, pcnext); #if ONLY_VIRTUAL_MACHINE printf("WARNING: No exception processing while ONLY_VIRTUAL_MACHINE is defined.\n"); cont_run = 0; #else if (delay_insn) { printf(" INFO: Exception during execution of delay slot insn.\n"); pc -= 4; } #if 0 if ((pcnext != (pc + 4)) && (except != EXCEPT_ITLBMISS)) { /* Always execute delay slot insn */ printf("XXXXXXXXXXXXXX\n"); fetch(); /* before starting with exception */ decode(&iqueue[0]); /* (itlbmiss is special case) */ execute(); } #endif if (!(mfspr(SPR_SR) & SPR_SR_EXR)) { printf("ABORT: Exception occured while exception detection was disabled.\n"); cont_run = 0; return; } pc_saved = pc & ~0x3; mtspr(SPR_EPCR_BASE, pc_saved); mtspr(SPR_EEAR_BASE, ea); mtspr(SPR_ESR_BASE, mfspr(SPR_SR)); /* Address translation is always disabled when starting exception. */ mtspr(SPR_SR, mfspr(SPR_SR) & ~(SPR_SR_DME)); mtspr(SPR_SR, mfspr(SPR_SR) & ~(SPR_SR_IME)); mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_SUPV); /* SUPV mode */ mtspr(SPR_SR, mfspr(SPR_SR) & ~SPR_SR_EXR); /* Disable except. */ pc = (unsigned long)except; /* MM: We do pc update after the execute (in the simulator), so we decrease it by 4 so that next instruction points to first exception instruction. */ if (except == EXCEPT_SYSCALL) pc -= 4; pcnext = pc+4; /* Added by CZ 27/05/01 */ pc_phy = pc; cycle_delay = 7; /* An exception stalls the CPU 7 clock cycles */ #endif }
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