add missing files not taken with github import
This commit is contained in:
Markus Fröschle
235
sys/fault_vectors.c
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235
sys/fault_vectors.c
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@@ -0,0 +1,235 @@
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/*
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* This file is part of BaS_gcc.
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*
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* BaS_gcc is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* BaS_gcc is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with BaS_gcc. If not, see <http://www.gnu.org/licenses/>.
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*
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* provide an early exception vector branch table to catch exceptions _before_ VBR has been setup eventually
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* (to RAMBAR0, in exceptions.S)
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*/
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#include "MCF5475.h"
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#include "bas_types.h"
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#include "bas_printf.h"
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typedef void (*exception_handler)(void);
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extern exception_handler SDRAM_VECTOR_TABLE[];
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/*
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* decipher Coldfire exception stack frame and print it out in cleartext
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*/
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void fault_handler(uint32_t pc, uint32_t format_status)
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{
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int format;
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int fault_status;
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int vector;
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int sr;
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xprintf("\007\007exception! Processor halted.\r\n");
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xprintf("format_status: %lx\r\n", format_status);
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xprintf("pc: %lx\r\n", pc);
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/*
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* extract info from format-/status word
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*/
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format = (format_status & 0b11110000000000000000000000000000) >> 28;
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fault_status = ((format_status & 0b00001100000000000000000000000000) >> 26) |
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((format_status & 0b00000000000000110000000000000000) >> 16);
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vector = (format_status & 0b00000011111111000000000000000000) >> 18;
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sr = (format_status & 0b00000000000000001111111111111111);
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xprintf("format: %x\r\n", format);
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xprintf("fault_status: %x (", fault_status);
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switch (fault_status)
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{
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case 0:
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xprintf("not an access or address error nor an interrupted debug service routine");
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break;
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case 1:
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case 3:
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case 11:
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xprintf("reserved");
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break;
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case 2:
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xprintf("interrupt during a debug service routine for faults other than access errors");
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break;
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case 4:
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xprintf("error (for example, protection fault) on instruction fetch");
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break;
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case 5:
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xprintf("TLB miss on opword or instruction fetch");
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break;
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case 6:
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xprintf("TLB miss on extension word of instruction fetch");
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break;
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case 7:
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xprintf("IFP access error while executing in emulator mode");
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break;
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case 8:
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xprintf("error on data write");
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break;
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case 9:
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xprintf("error on attempted write to write-protected space");
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break;
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case 10:
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xprintf("TLB miss on data write");
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break;
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case 12:
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xprintf("error on data read");
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break;
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case 13:
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xprintf("attempted read, read-modify-write of protected space");
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break;
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case 14:
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xprintf("TLB miss on data read or read-modify-write");
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break;
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case 15:
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xprintf("OEP access error while executing in emulator mode");
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}
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xprintf(")\r\n");
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xprintf("vector = %d (", vector);
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switch (vector)
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{
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case 2:
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xprintf("access error");
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break;
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case 3:
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xprintf("address error");
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break;
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case 4:
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xprintf("illegal instruction");
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break;
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case 5:
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xprintf("divide by zero");
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break;
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case 8:
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xprintf("privilege violation");
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break;
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case 9:
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xprintf("trace");
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break;
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case 10:
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xprintf("unimplemented line-a opcode");
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break;
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case 11:
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xprintf("unimplemented line-f opcode");
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break;
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case 12:
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xprintf("non-PC breakpoint debug interrupt");
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break;
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case 13:
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xprintf("PC breakpoint debug interrupt");
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break;
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case 14:
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xprintf("format error");
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break;
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case 24:
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xprintf("spurious interrupt");
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break;
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default:
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if ( ((vector >= 6) && (vector <= 7)) ||
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((vector >= 16) && (vector <= 23)))
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{
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xprintf("reserved");
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}
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else if ((vector >= 25) && (vector <= 31))
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{
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xprintf("level %d autovectored interrupt", fault_status - 24);
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}
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else if ((vector >= 32) && (vector <= 47))
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{
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xprintf("trap #%d", vector - 32);
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}
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else
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{
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xprintf("unknown vector\r\n");
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}
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}
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xprintf(")\r\n");
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xprintf("sr=%4x\r\n", sr);
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__asm__ __volatile__(
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" move.w 0x2700,d0 \r\n" // disable interrupts
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" move.w d0,sr \r\n"
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" halt \r\n" // stop processor
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: /* no output */
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: /* no input */
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: "memory");
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}
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void __attribute__((interrupt)) handler(void)
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{
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/*
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* Prepare exception stack contents so it can be handled by a C routine.
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*
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* For standard routines, we'd have to save registers here.
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* Since we do not intend to return anyway, we just ignore that requirement.
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*/
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__asm__ __volatile__("move.l (sp),-(sp)\n\t"\
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"move.l 8(sp),-(sp)\n\t"\
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"bsr _fault_handler\n\t"\
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"halt\n\t"\
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: : : "memory");
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}
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void setup_vectors(void)
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{
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int i;
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xprintf("\r\ninstall early exception vector table:");
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for (i = 8; i < 256; i++)
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{
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SDRAM_VECTOR_TABLE[i] = &handler;
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}
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/*
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* make sure VBR points to our table
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*/
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__asm__ __volatile__("clr.l d0\n\t"\
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"movec.l d0,VBR\n\t"\
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"nop\n\t"\
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"move.l d0,_rt_vbr"
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: /* outputs */
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: /* inputs */
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: "d0", "memory", "cc" /* clobbered registers */
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);
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xprintf("finished.\r\n");
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}
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