leandrof/u-boot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
cc49cadeeb
u-boot/cpu/ppc4xx/traps.c
Grzegorz Bernacki 15ee4734e4 [PPC440SPe] Convert machine check exceptions handling 
Convert using fixup mechanism to suppressing MCK for the duration of config
read/write transaction: while fixups work fine with the case of a precise
exception, we identified a major drawback with this approach when there's
an imprecise case. In this scenario there is the following race condition:
the fixup is (by design) set to catch the instruction following the one
actually causing the exception; if an interrupt (e.g. decrementer) happens
between those two instructions, the ISR code is executed before the fixup
handler the machine check is no longer protected by the fixup handler as it
appears as within the ISR code. In consequence the fixup approach is being
phased out and replaced with explicit suppressing of MCK during a PCIe
config read/write cycle.

Signed-off-by: Grzegorz Bernacki <gjb@semihalf.com>
2007-09-07 17:46:18 +02:00

408 lines
9.5 KiB
C
Raw Blame History

/*
* 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;
int corr_ecc = 0;
int uncorr_ecc = 0;
#endif
if ((fixup = search_exception_table(regs->nip)) != 0) {
regs->nip = fixup;
val = mfspr(MCSR);
/* Clear MCSR */
mtspr(SPRN_MCSR, val);
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");
uncorr_ecc = 1;
}
if (val & 0x10) {
printf("DDR0: Single uncorrectable ECC event.\n");
uncorr_ecc = 1;
}
if (val & 0x08) {
printf("DDR0: Multiple correctable ECC events.\n");
corr_ecc = 1;
}
if (val & 0x04) {
printf("DDR0: Single correctable ECC event.\n");
corr_ecc = 1;
}
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) && corr_ecc)
printf("DDR0: Syndrome for correctable ECC event 0x%x\n",
(val >> 16) & 0xff);
mfsdram(DDR0_23, val);
if (((val >> 8) & 0xff) && uncorr_ecc)
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 && uncorr_ecc)
printf("DDR0: Address of uncorrectable ECC event %p\n", val);
mfsdram(DDR0_35, val);
if (val && uncorr_ecc)
printf("DDR0: Address of uncorrectable ECC event %p\n", val);
mfsdram(DDR0_36, val);
if (val && uncorr_ecc)
printf("DDR0: Data of uncorrectable ECC event 0x%08x\n", val);
mfsdram(DDR0_37, val);
if (val && uncorr_ecc)
printf("DDR0: Data of uncorrectable ECC event 0x%08x\n", val);
mfsdram(DDR0_38, val);
if (val && corr_ecc)
printf("DDR0: Address of correctable ECC event %p\n", val);
mfsdram(DDR0_39, val);
if (val && corr_ecc)
printf("DDR0: Address of correctable ECC event %p\n", val);
mfsdram(DDR0_40, val);
if (val && corr_ecc)
printf("DDR0: Data of correctable ECC event 0x%08x\n", val);
mfsdram(DDR0_41, val);
if (val && corr_ecc)
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;
}
Reference in New Issue View Git Blame Copy Permalink