uboot/arch/powerpc/cpu/mpc85xx/traps.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * linux/arch/powerpc/kernel/traps.c
   4 *
   5 * Copyright 2007 Freescale Semiconductor.
   6 * Copyright (C) 2003 Motorola
   7 * Modified by Xianghua Xiao(x.xiao@motorola.com)
   8 *
   9 * Copyright (C) 1995-1996  Gary Thomas (gdt@linuxppc.org)
  10 *
  11 * Modified by Cort Dougan (cort@cs.nmt.edu)
  12 * and Paul Mackerras (paulus@cs.anu.edu.au)
  13 *
  14 * (C) Copyright 2000
  15 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  16 */
  17
  18/*
  19 * This file handles the architecture-dependent parts of hardware exceptions
  20 */
  21
  22#include <common.h>
  23#include <command.h>
  24#include <irq_func.h>
  25#include <kgdb.h>
  26#include <asm/processor.h>
  27
  28DECLARE_GLOBAL_DATA_PTR;
  29
  30/* Returns 0 if exception not found and fixup otherwise.  */
  31extern unsigned long search_exception_table(unsigned long);
  32
  33/*
  34 * End of addressable memory.  This may be less than the actual
  35 * amount of memory on the system if we're unable to keep all
  36 * the memory mapped in.
  37 */
  38#define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
  39
  40static __inline__ void set_tsr(unsigned long val)
  41{
  42        asm volatile("mtspr 0x150, %0" : : "r" (val));
  43}
  44
  45static __inline__ unsigned long get_esr(void)
  46{
  47        unsigned long val;
  48        asm volatile("mfspr %0, 0x03e" : "=r" (val) :);
  49        return val;
  50}
  51
  52#define ESR_MCI 0x80000000
  53#define ESR_PIL 0x08000000
  54#define ESR_PPR 0x04000000
  55#define ESR_PTR 0x02000000
  56#define ESR_DST 0x00800000
  57#define ESR_DIZ 0x00400000
  58#define ESR_U0F 0x00008000
  59
  60#if defined(CONFIG_CMD_BEDBUG)
  61extern void do_bedbug_breakpoint(struct pt_regs *);
  62#endif
  63
  64/*
  65 * Trap & Exception support
  66 */
  67
  68static void print_backtrace(unsigned long *sp)
  69{
  70        int cnt = 0;
  71        unsigned long i;
  72
  73        printf("Call backtrace: ");
  74        while (sp) {
  75                if ((uint)sp > END_OF_MEM)
  76                        break;
  77
  78                i = sp[1];
  79                if (cnt++ % 7 == 0)
  80                        printf("\n");
  81                printf("%08lX ", i);
  82                if (cnt > 32) break;
  83                sp = (unsigned long *)*sp;
  84        }
  85        printf("\n");
  86}
  87
  88void show_regs(struct pt_regs *regs)
  89{
  90        int i;
  91
  92        printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
  93               regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
  94        printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
  95               regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
  96               regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
  97               regs->msr&MSR_IR ? 1 : 0,
  98               regs->msr&MSR_DR ? 1 : 0);
  99
 100        printf("\n");
 101        for (i = 0;  i < 32;  i++) {
 102                if ((i % 8) == 0)
 103                {
 104                        printf("GPR%02d: ", i);
 105                }
 106
 107                printf("%08lX ", regs->gpr[i]);
 108                if ((i % 8) == 7)
 109                {
 110                        printf("\n");
 111                }
 112        }
 113}
 114
 115
 116static void _exception(int signr, struct pt_regs *regs)
 117{
 118        show_regs(regs);
 119        print_backtrace((unsigned long *)regs->gpr[1]);
 120        panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
 121}
 122
 123void CritcalInputException(struct pt_regs *regs)
 124{
 125        panic("Critical Input Exception");
 126}
 127
 128int machinecheck_count = 0;
 129int machinecheck_error = 0;
 130void MachineCheckException(struct pt_regs *regs)
 131{
 132        unsigned long fixup;
 133        unsigned int mcsr, mcsrr0, mcsrr1, mcar;
 134
 135        /* Probing PCI using config cycles cause this exception
 136         * when a device is not present.  Catch it and return to
 137         * the PCI exception handler.
 138         */
 139        if ((fixup = search_exception_table(regs->nip)) != 0) {
 140                regs->nip = fixup;
 141                return;
 142        }
 143
 144        mcsrr0 = mfspr(SPRN_MCSRR0);
 145        mcsrr1 = mfspr(SPRN_MCSRR1);
 146        mcsr = mfspr(SPRN_MCSR);
 147        mcar = mfspr(SPRN_MCAR);
 148
 149        machinecheck_count++;
 150        machinecheck_error=1;
 151
 152#if defined(CONFIG_CMD_KGDB)
 153        if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 154                return;
 155#endif
 156
 157        printf("Machine check in kernel mode.\n");
 158        printf("Caused by (from mcsr): ");
 159        printf("mcsr = 0x%08x\n", mcsr);
 160        if (mcsr & 0x80000000)
 161                printf("Machine check input pin\n");
 162        if (mcsr & 0x40000000)
 163                printf("Instruction cache parity error\n");
 164        if (mcsr & 0x20000000)
 165                printf("Data cache push parity error\n");
 166        if (mcsr & 0x10000000)
 167                printf("Data cache parity error\n");
 168        if (mcsr & 0x00000080)
 169                printf("Bus instruction address error\n");
 170        if (mcsr & 0x00000040)
 171                printf("Bus Read address error\n");
 172        if (mcsr & 0x00000020)
 173                printf("Bus Write address error\n");
 174        if (mcsr & 0x00000010)
 175                printf("Bus Instruction data bus error\n");
 176        if (mcsr & 0x00000008)
 177                printf("Bus Read data bus error\n");
 178        if (mcsr & 0x00000004)
 179                printf("Bus Write bus error\n");
 180        if (mcsr & 0x00000002)
 181                printf("Bus Instruction parity error\n");
 182        if (mcsr & 0x00000001)
 183                printf("Bus Read parity error\n");
 184
 185        show_regs(regs);
 186        printf("MCSR=0x%08x \tMCSRR0=0x%08x \nMCSRR1=0x%08x \tMCAR=0x%08x\n",
 187               mcsr, mcsrr0, mcsrr1, mcar);
 188        print_backtrace((unsigned long *)regs->gpr[1]);
 189        if (machinecheck_count > 10) {
 190                panic("machine check count too high\n");
 191        }
 192
 193        if (machinecheck_count > 1) {
 194                regs->nip += 4; /* skip offending instruction */
 195                printf("Skipping current instr, Returning to 0x%08lx\n",
 196                       regs->nip);
 197        } else {
 198                printf("Returning back to 0x%08lx\n",regs->nip);
 199        }
 200}
 201
 202void AlignmentException(struct pt_regs *regs)
 203{
 204#if defined(CONFIG_CMD_KGDB)
 205        if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 206                return;
 207#endif
 208
 209        show_regs(regs);
 210        print_backtrace((unsigned long *)regs->gpr[1]);
 211        panic("Alignment Exception");
 212}
 213
 214void ProgramCheckException(struct pt_regs *regs)
 215{
 216        long esr_val;
 217
 218#if defined(CONFIG_CMD_KGDB)
 219        if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 220                return;
 221#endif
 222
 223        show_regs(regs);
 224
 225        esr_val = get_esr();
 226        if( esr_val & ESR_PIL )
 227                printf( "** Illegal Instruction **\n" );
 228        else if( esr_val & ESR_PPR )
 229                printf( "** Privileged Instruction **\n" );
 230        else if( esr_val & ESR_PTR )
 231                printf( "** Trap Instruction **\n" );
 232
 233        print_backtrace((unsigned long *)regs->gpr[1]);
 234        panic("Program Check Exception");
 235}
 236
 237void PITException(struct pt_regs *regs)
 238{
 239        /*
 240         * Reset PIT interrupt
 241         */
 242        set_tsr(0x0c000000);
 243
 244        /*
 245         * Call timer_interrupt routine in interrupts.c
 246         */
 247        timer_interrupt(NULL);
 248}
 249
 250void UnknownException(struct pt_regs *regs)
 251{
 252#if defined(CONFIG_CMD_KGDB)
 253        if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 254                return;
 255#endif
 256
 257        printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
 258               regs->nip, regs->msr, regs->trap);
 259        _exception(0, regs);
 260}
 261
 262void ExtIntException(struct pt_regs *regs)
 263{
 264        volatile ccsr_pic_t *pic = (void *)(CONFIG_SYS_MPC8xxx_PIC_ADDR);
 265
 266        uint vect;
 267
 268#if defined(CONFIG_CMD_KGDB)
 269        if (debugger_exception_handler && (*debugger_exception_handler)(regs))
 270                return;
 271#endif
 272
 273        printf("External Interrupt Exception at PC: %lx, SR: %lx, vector=%lx",
 274               regs->nip, regs->msr, regs->trap);
 275        vect = pic->iack0;
 276        printf(" irq IACK0@%05x=%d\n",(int)&pic->iack0,vect);
 277        show_regs(regs);
 278        print_backtrace((unsigned long *)regs->gpr[1]);
 279}
 280
 281void DebugException(struct pt_regs *regs)
 282{
 283        printf("Debugger trap at @ %lx\n", regs->nip );
 284        show_regs(regs);
 285#if defined(CONFIG_CMD_BEDBUG)
 286        do_bedbug_breakpoint( regs );
 287#endif
 288}
 289