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-rw-r--r--cpu/ppc4xx/traps.c291
1 files changed, 291 insertions, 0 deletions
diff --git a/cpu/ppc4xx/traps.c b/cpu/ppc4xx/traps.c
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+/*
+ * linux/arch/ppc/kernel/traps.c
+ *
+ * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *
+ * Modified by Cort Dougan (cort@cs.nmt.edu)
+ * and Paul Mackerras (paulus@cs.anu.edu.au)
+ *
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * This file handles the architecture-dependent parts of hardware exceptions
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/processor.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
+int (*debugger_exception_handler)(struct pt_regs *) = 0;
+#endif
+
+/* Returns 0 if exception not found and fixup otherwise. */
+extern unsigned long search_exception_table(unsigned long);
+
+/* THIS NEEDS CHANGING to use the board info structure.
+ */
+#define END_OF_MEM 0x00400000
+
+
+static __inline__ void set_tsr(unsigned long val)
+{
+#if defined(CONFIG_440)
+ asm volatile("mtspr 0x150, %0" : : "r" (val));
+#else
+ asm volatile("mttsr %0" : : "r" (val));
+#endif
+}
+
+static __inline__ unsigned long get_esr(void)
+{
+ unsigned long val;
+
+#if defined(CONFIG_440)
+ asm volatile("mfspr %0, 0x03e" : "=r" (val) :);
+#else
+ asm volatile("mfesr %0" : "=r" (val) :);
+#endif
+ return val;
+}
+
+#define ESR_MCI 0x80000000
+#define ESR_PIL 0x08000000
+#define ESR_PPR 0x04000000
+#define ESR_PTR 0x02000000
+#define ESR_DST 0x00800000
+#define ESR_DIZ 0x00400000
+#define ESR_U0F 0x00008000
+
+#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
+extern void do_bedbug_breakpoint(struct pt_regs *);
+#endif
+
+/*
+ * Trap & Exception support
+ */
+
+void
+print_backtrace(unsigned long *sp)
+{
+ int cnt = 0;
+ unsigned long i;
+
+ printf("Call backtrace: ");
+ while (sp) {
+ if ((uint)sp > END_OF_MEM)
+ break;
+
+ i = sp[1];
+ if (cnt++ % 7 == 0)
+ printf("\n");
+ printf("%08lX ", i);
+ if (cnt > 32) break;
+ sp = (unsigned long *)*sp;
+ }
+ printf("\n");
+}
+
+void show_regs(struct pt_regs * regs)
+{
+ int i;
+
+ printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
+ regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
+ printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
+ regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
+ regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
+ regs->msr&MSR_IR ? 1 : 0,
+ regs->msr&MSR_DR ? 1 : 0);
+
+ printf("\n");
+ for (i = 0; i < 32; i++) {
+ if ((i % 8) == 0)
+ {
+ printf("GPR%02d: ", i);
+ }
+
+ printf("%08lX ", regs->gpr[i]);
+ if ((i % 8) == 7)
+ {
+ printf("\n");
+ }
+ }
+}
+
+
+void
+_exception(int signr, struct pt_regs *regs)
+{
+ show_regs(regs);
+ print_backtrace((unsigned long *)regs->gpr[1]);
+ panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
+}
+
+void
+MachineCheckException(struct pt_regs *regs)
+{
+ unsigned long fixup;
+
+ /* Probing PCI using config cycles cause this exception
+ * when a device is not present. Catch it and return to
+ * the PCI exception handler.
+ */
+ if ((fixup = search_exception_table(regs->nip)) != 0) {
+ regs->nip = fixup;
+ return;
+ }
+
+#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
+ if (debugger_exception_handler && (*debugger_exception_handler)(regs))
+ return;
+#endif
+
+ printf("Machine check in kernel mode.\n");
+ printf("Caused by (from msr): ");
+ printf("regs %p ",regs);
+ switch( regs->msr & 0x0000F000)
+ {
+ case (1<<12) :
+ printf("Machine check signal - probably due to mm fault\n"
+ "with mmu off\n");
+ break;
+ case (1<<13) :
+ printf("Transfer error ack signal\n");
+ break;
+ case (1<<14) :
+ printf("Data parity signal\n");
+ break;
+ case (1<<15) :
+ printf("Address parity signal\n");
+ break;
+ default:
+ printf("Unknown values in msr\n");
+ }
+ show_regs(regs);
+ print_backtrace((unsigned long *)regs->gpr[1]);
+ panic("machine check");
+}
+
+void
+AlignmentException(struct pt_regs *regs)
+{
+#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
+ if (debugger_exception_handler && (*debugger_exception_handler)(regs))
+ return;
+#endif
+
+ show_regs(regs);
+ print_backtrace((unsigned long *)regs->gpr[1]);
+ panic("Alignment Exception");
+}
+
+void
+ProgramCheckException(struct pt_regs *regs)
+{
+ long esr_val;
+
+#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
+ if (debugger_exception_handler && (*debugger_exception_handler)(regs))
+ return;
+#endif
+
+ show_regs(regs);
+
+ esr_val = get_esr();
+ if( esr_val & ESR_PIL )
+ printf( "** Illegal Instruction **\n" );
+ else if( esr_val & ESR_PPR )
+ printf( "** Privileged Instruction **\n" );
+ else if( esr_val & ESR_PTR )
+ printf( "** Trap Instruction **\n" );
+
+ print_backtrace((unsigned long *)regs->gpr[1]);
+ panic("Program Check Exception");
+}
+
+void
+PITException(struct pt_regs *regs)
+{
+ /*
+ * Reset PIT interrupt
+ */
+ set_tsr(0x08000000);
+
+ /*
+ * Call timer_interrupt routine in interrupts.c
+ */
+ timer_interrupt(NULL);
+}
+
+
+void
+UnknownException(struct pt_regs *regs)
+{
+#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
+ if (debugger_exception_handler && (*debugger_exception_handler)(regs))
+ return;
+#endif
+
+ printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
+ regs->nip, regs->msr, regs->trap);
+ _exception(0, regs);
+}
+
+void
+DebugException(struct pt_regs *regs)
+{
+ printf("Debugger trap at @ %lx\n", regs->nip );
+ show_regs(regs);
+#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
+ do_bedbug_breakpoint( regs );
+#endif
+}
+
+/* Probe an address by reading. If not present, return -1, otherwise
+ * return 0.
+ */
+int
+addr_probe(uint *addr)
+{
+#if 0
+ int retval;
+
+ __asm__ __volatile__( \
+ "1: lwz %0,0(%1)\n" \
+ " eieio\n" \
+ " li %0,0\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3: li %0,-1\n" \
+ " b 2b\n" \
+ ".section __ex_table,\"a\"\n" \
+ " .align 2\n" \
+ " .long 1b,3b\n" \
+ ".text" \
+ : "=r" (retval) : "r"(addr));
+
+ return (retval);
+#endif
+ return 0;
+}
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