u-boot/arch/powerpc/cpu/mpc8260/traps.c

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/*
* linux/arch/powerpc/kernel/traps.c
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*
* 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.
*
* SPDX-License-Identifier: GPL-2.0+
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*/
/*
* This file handles the architecture-dependent parts of hardware exceptions
*/
#include <common.h>
#include <command.h>
#include <kgdb.h>
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#include <asm/processor.h>
#include <asm/m8260_pci.h>
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/* 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 0x02000000
/*
* Trap & Exception support
*/
static void print_backtrace(unsigned long *sp)
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{
int cnt = 0;
unsigned long i;
puts ("Call backtrace: ");
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while (sp) {
if ((uint)sp > END_OF_MEM)
break;
i = sp[1];
if (cnt++ % 7 == 0)
putc ('\n');
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printf("%08lX ", i);
if (cnt > 32) break;
sp = (unsigned long *)*sp;
}
putc ('\n');
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}
void show_regs(struct pt_regs *regs)
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{
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);
putc ('\n');
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for (i = 0; i < 32; i++) {
if ((i % 8) == 0) {
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printf("GPR%02d: ", i);
}
printf("%08lX ", regs->gpr[i]);
if ((i % 8) == 7) {
putc ('\n');
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}
}
}
static void _exception(int signr, struct pt_regs *regs)
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{
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
}
#ifdef CONFIG_PCI
void dump_pci (void)
{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
printf ("PCI: err status %x err mask %x err ctrl %x\n",
le32_to_cpu (immap->im_pci.pci_esr),
le32_to_cpu (immap->im_pci.pci_emr),
le32_to_cpu (immap->im_pci.pci_ecr));
printf (" error address %x error data %x ctrl %x\n",
le32_to_cpu (immap->im_pci.pci_eacr),
le32_to_cpu (immap->im_pci.pci_edcr),
le32_to_cpu (immap->im_pci.pci_eccr));
}
#endif
void MachineCheckException(struct pt_regs *regs)
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{
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.
*/
#ifdef CONFIG_PCI
volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
#ifdef DEBUG
dump_pci();
#endif
/* clear the error in the error status register */
if(immap->im_pci.pci_esr & cpu_to_le32(PCI_ERROR_PCI_NO_RSP)) {
immap->im_pci.pci_esr = cpu_to_le32(PCI_ERROR_PCI_NO_RSP);
return;
}
#endif
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if ((fixup = search_exception_table(regs->nip)) != 0) {
regs->nip = fixup;
return;
}
#if defined(CONFIG_CMD_KGDB)
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if (debugger_exception_handler && (*debugger_exception_handler)(regs))
return;
#endif
puts ("Machine check in kernel mode.\n"
"Caused by (from msr): ");
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printf("regs %p ",regs);
switch( regs->msr & 0x000F0000) {
case (0x80000000>>12):
puts ("Machine check signal - probably due to mm fault\n"
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"with mmu off\n");
break;
case (0x80000000>>13):
puts ("Transfer error ack signal\n");
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break;
case (0x80000000>>14):
puts ("Data parity signal\n");
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break;
case (0x80000000>>15):
puts ("Address parity signal\n");
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break;
default:
puts ("Unknown values in msr\n");
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}
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
#ifdef CONFIG_PCI
dump_pci();
#endif
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panic("machine check");
}
void AlignmentException(struct pt_regs *regs)
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{
#if defined(CONFIG_CMD_KGDB)
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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)
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{
#if defined(CONFIG_CMD_KGDB)
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if (debugger_exception_handler && (*debugger_exception_handler)(regs))
return;
#endif
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
panic("Program Check Exception");
}
void SoftEmuException(struct pt_regs *regs)
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{
#if defined(CONFIG_CMD_KGDB)
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if (debugger_exception_handler && (*debugger_exception_handler)(regs))
return;
#endif
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
panic("Software Emulation Exception");
}
void UnknownException(struct pt_regs *regs)
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{
#if defined(CONFIG_CMD_KGDB)
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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);
}
#if defined(CONFIG_CMD_BEDBUG)
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extern void do_bedbug_breakpoint(struct pt_regs *);
#endif
void DebugException(struct pt_regs *regs)
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{
printf("Debugger trap at @ %lx\n", regs->nip );
show_regs(regs);
#if defined(CONFIG_CMD_BEDBUG)
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do_bedbug_breakpoint( regs );
#endif
}
/* Probe an address by reading. If not present, return -1, otherwise
* return 0.
*/
int addr_probe(uint *addr)
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{
#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;
}