/* * 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> DECLARE_GLOBAL_DATA_PTR; #if defined(CONFIG_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 (gd->bd->bi_memstart + gd->bd->bi_memsize) 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 defined(CONFIG_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 DEAR: %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"); } void MachineCheckException(struct pt_regs *regs) { unsigned long fixup, val; #if defined(CONFIG_440EPX) || defined(CONFIG_440GRX) u32 value2; #endif /* 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 defined(CONFIG_CMD_KGDB) if (debugger_exception_handler && (*debugger_exception_handler)(regs)) return; #endif printf("Machine Check Exception.\n"); printf("Caused by (from msr): "); printf("regs %p ", regs); val = get_esr(); #if !defined(CONFIG_440) if (val& ESR_IMCP) { printf("Instruction"); mtspr(ESR, val & ~ESR_IMCP); } else { printf("Data"); } printf(" machine check.\n"); #elif defined(CONFIG_440) if (val& ESR_IMCP){ printf("Instruction Synchronous Machine Check exception\n"); mtspr(SPRN_ESR, val & ~ESR_IMCP); } else { val = mfspr(MCSR); if (val & MCSR_IB) printf("Instruction Read PLB Error\n"); if (val & MCSR_DRB) printf("Data Read PLB Error\n"); if (val & MCSR_DWB) printf("Data Write PLB Error\n"); if (val & MCSR_TLBP) printf("TLB Parity Error\n"); if (val & MCSR_ICP){ /*flush_instruction_cache(); */ printf("I-Cache Parity Error\n"); } if (val & MCSR_DCSP) printf("D-Cache Search Parity Error\n"); if (val & MCSR_DCFP) printf("D-Cache Flush Parity Error\n"); if (val & MCSR_IMPE) printf("Machine Check exception is imprecise\n"); /* Clear MCSR */ mtspr(SPRN_MCSR, val); } #if defined(CONFIG_440EPX) || defined(CONFIG_440GRX) mfsdram(DDR0_00, val) ; printf("DDR0: DDR0_00 %p\n", val); val = (val >> 16) & 0xff; if (val & 0x80) printf("DDR0: At least one interrupt active\n"); if (val & 0x40) printf("DDR0: DRAM initialization complete.\n"); if (val & 0x20) printf("DDR0: Multiple uncorrectable ECC events.\n"); if (val & 0x10) printf("DDR0: Single uncorrectable ECC event.\n"); if (val & 0x08) printf("DDR0: Multiple correctable ECC events.\n"); if (val & 0x04) printf("DDR0: Single correctable ECC event.\n"); if (val & 0x02) printf("Multiple accesses outside the defined" " physical memory space detected\n"); if (val & 0x01) printf("DDR0: Single access outside the defined" " physical memory space detected.\n"); mfsdram(DDR0_01, val); val = (val >> 8) & 0x7; switch (val ) { case 0: printf("DDR0: Write Out-of-Range command\n"); break; case 1: printf("DDR0: Read Out-of-Range command\n"); break; case 2: printf("DDR0: Masked write Out-of-Range command\n"); break; case 4: printf("DDR0: Wrap write Out-of-Range command\n"); break; case 5: printf("DDR0: Wrap read Out-of-Range command\n"); break; default: mfsdram(DDR0_01, value2); printf("DDR0: No DDR0 error know 0x%x %p\n", val, value2); } mfsdram(DDR0_23, val); if ( (val >> 16) & 0xff) printf("DDR0: Syndrome for correctable ECC event 0x%x\n", (val >> 16) & 0xff); mfsdram(DDR0_23, val); if ( (val >> 8) & 0xff) printf("DDR0: Syndrome for uncorrectable ECC event 0x%x\n", (val >> 8) & 0xff); mfsdram(DDR0_33, val); if (val) printf("DDR0: Address of command that caused an " "Out-of-Range interrupt %p\n", val); mfsdram(DDR0_34, val); if (val) printf("DDR0: Address of uncorrectable ECC event %p\n", val); mfsdram(DDR0_35, val); if (val) printf("DDR0: Address of uncorrectable ECC event %p\n", val); mfsdram(DDR0_36, val); if (val) printf("DDR0: Data of uncorrectable ECC event 0x%08x\n", val); mfsdram(DDR0_37, val); if (val) printf("DDR0: Data of uncorrectable ECC event 0x%08x\n", val); mfsdram(DDR0_38, val); if (val) printf("DDR0: Address of correctable ECC event %p\n", val); mfsdram(DDR0_39, val); if (val) printf("DDR0: Address of correctable ECC event %p\n", val); mfsdram(DDR0_40, val); if (val) printf("DDR0: Data of correctable ECC event 0x%08x\n", val); mfsdram(DDR0_41, val); if (val) printf("DDR0: Data of correctable ECC event 0x%08x\n", val); #endif /* CONFIG_440EPX */ #endif /* CONFIG_440 */ show_regs(regs); print_backtrace((unsigned long *)regs->gpr[1]); panic("machine check"); } void AlignmentException(struct pt_regs *regs) { #if defined(CONFIG_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 defined(CONFIG_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 DecrementerPITException(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 defined(CONFIG_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 defined(CONFIG_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; }