/**
* @file
*
* @ingroup ppc_exc
*
* @brief PowerPC Exceptions implementation.
*/
/*
* Copyright (C) 1999 Eric Valette (valette@crf.canon.fr)
* Canon Centre Recherche France.
*
* Derived from file "libcpu/powerpc/new-exceptions/bspsupport/vectors_init.c".
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#include <bsp/vectors.h>
#ifndef __SPE__
#define GET_GPR(gpr) (gpr)
#else
#define GET_GPR(gpr) ((int) ((gpr) >> 32))
#endif
exception_handler_t globalExceptHdl = C_exception_handler;
/* T. Straumann: provide a stack trace
* <strauman@slac.stanford.edu>, 6/26/2001
*/
typedef struct LRFrameRec_ {
struct LRFrameRec_ *frameLink;
unsigned long *lr;
} LRFrameRec, *LRFrame;
#define STACK_CLAMP 50 /* in case we have a corrupted bottom */
static uint32_t ppc_exc_get_DAR_dflt(void)
{
if (ppc_cpu_is_60x())
return PPC_SPECIAL_PURPOSE_REGISTER(PPC_DAR);
else
switch (ppc_cpu_is_bookE()) {
default:
break;
case PPC_BOOKE_STD:
case PPC_BOOKE_E500:
return PPC_SPECIAL_PURPOSE_REGISTER(DEAR_BOOKE);
case PPC_BOOKE_405:
return PPC_SPECIAL_PURPOSE_REGISTER(DEAR_405);
}
return 0xdeadbeef;
}
uint32_t (*ppc_exc_get_DAR)(void) = ppc_exc_get_DAR_dflt;
void BSP_printStackTrace(BSP_Exception_frame *excPtr)
{
LRFrame f;
int i;
LRFrame sp;
void *lr;
printk("Stack Trace: \n ");
if (excPtr) {
printk("IP: 0x%08x, ", excPtr->EXC_SRR0);
sp = (LRFrame) GET_GPR(excPtr->GPR1);
lr = (void *) excPtr->EXC_LR;
} else {
/* there's no macro for this */
__asm__ __volatile__("mr %0, 1":"=r"(sp));
lr = (LRFrame) ppc_link_register();
}
printk("LR: 0x%08x\n", lr);
for (f = (LRFrame) sp, i = 0; f->frameLink && i < STACK_CLAMP; f = f->frameLink) {
printk("--^ 0x%08x", (long) (f->frameLink->lr));
if (!(++i % 5))
printk("\n");
}
if (i >= STACK_CLAMP) {
printk("Too many stack frames (stack possibly corrupted), giving up...\n");
} else {
if (i % 5)
printk("\n");
}
}
void C_exception_handler(BSP_Exception_frame *excPtr)
{
static int nest = 0;
int recoverable = 0;
rtems_id id = 0;
int synch;
unsigned n;
rtems_status_code sc;
/* Catch recursion */
nest++;
if (nest > 2) {
/* maybe printk() or dereferencing excPtr caused an exception;
* die silently...
*/
while (1);
}
synch = (int) excPtr->_EXC_number >= 0;
n = excPtr->_EXC_number & 0x7fff;
printk("Exception handler called for exception %d (0x%x)\n", n, n);
printk("\t Next PC or Address of fault = %08x\n", excPtr->EXC_SRR0);
printk("\t Saved MSR = %08x\n", excPtr->EXC_SRR1);
if (nest > 1) {
printk("Recursion in the exception handler detected; I'll spin now...\n");
while (1);
}
/* Try to find out more about the context where this happened */
printk("\t Context: ");
if (rtems_interrupt_is_in_progress()) {
printk("ISR");
} else if (!_Thread_Executing) {
printk("Initialization (_Thread_Executing not available yet)");
} else {
if (RTEMS_SUCCESSFUL != (sc = rtems_task_ident(RTEMS_SELF, RTEMS_LOCAL, &id))) {
printk("Unable to determine faulting task; rtems_task_ident() returned %u", sc);
id = 0;
} else {
printk("Task ID 0x%08x", id);
}
}
printk("\n");
/* Dump registers */
printk("\t R0 = %08x", GET_GPR(excPtr->GPR0));
if (synch) {
printk(" R1 = %08x", GET_GPR(excPtr->GPR1));
printk(" R2 = %08x", GET_GPR(excPtr->GPR2));
} else {
printk(" ");
printk(" ");
}
printk(" R3 = %08x\n", GET_GPR(excPtr->GPR3));
printk("\t R4 = %08x", GET_GPR(excPtr->GPR4));
printk(" R5 = %08x", GET_GPR(excPtr->GPR5));
printk(" R6 = %08x", GET_GPR(excPtr->GPR6));
printk(" R7 = %08x\n", GET_GPR(excPtr->GPR7));
printk("\t R8 = %08x", GET_GPR(excPtr->GPR8));
printk(" R9 = %08x", GET_GPR(excPtr->GPR9));
printk(" R10 = %08x", GET_GPR(excPtr->GPR10));
printk(" R11 = %08x\n", GET_GPR(excPtr->GPR11));
printk("\t R12 = %08x", GET_GPR(excPtr->GPR12));
if (synch) {
printk(" R13 = %08x", GET_GPR(excPtr->GPR13));
printk(" R14 = %08x", GET_GPR(excPtr->GPR14));
printk(" R15 = %08x\n", GET_GPR(excPtr->GPR15));
printk("\t R16 = %08x", GET_GPR(excPtr->GPR16));
printk(" R17 = %08x", GET_GPR(excPtr->GPR17));
printk(" R18 = %08x", GET_GPR(excPtr->GPR18));
printk(" R19 = %08x\n", GET_GPR(excPtr->GPR19));
printk("\t R20 = %08x", GET_GPR(excPtr->GPR20));
printk(" R21 = %08x", GET_GPR(excPtr->GPR21));
printk(" R22 = %08x", GET_GPR(excPtr->GPR22));
printk(" R23 = %08x\n", GET_GPR(excPtr->GPR23));
printk("\t R24 = %08x", GET_GPR(excPtr->GPR24));
printk(" R25 = %08x", GET_GPR(excPtr->GPR25));
printk(" R26 = %08x", GET_GPR(excPtr->GPR26));
printk(" R27 = %08x\n", GET_GPR(excPtr->GPR27));
printk("\t R28 = %08x", GET_GPR(excPtr->GPR28));
printk(" R29 = %08x", GET_GPR(excPtr->GPR29));
printk(" R30 = %08x", GET_GPR(excPtr->GPR30));
printk(" R31 = %08x\n", GET_GPR(excPtr->GPR31));
} else {
printk("\n");
}
printk("\t CR = %08x\n", excPtr->EXC_CR);
printk("\t CTR = %08x\n", excPtr->EXC_CTR);
printk("\t XER = %08x\n", excPtr->EXC_XER);
printk("\t LR = %08x\n", excPtr->EXC_LR);
/* Would be great to print DAR but unfortunately,
* that is not portable across different CPUs.
* AFAIK on classic PPC DAR is SPR 19, on the
* 405 we have DEAR = SPR 0x3d5 and booE says
* DEAR = SPR 61 :-(
*/
if (ppc_exc_get_DAR) {
printk("\t DAR = %08x\n", ppc_exc_get_DAR());
}
BSP_printStackTrace(excPtr);
if (excPtr->_EXC_number == ASM_DEC_VECTOR)
recoverable = 1;
if (excPtr->_EXC_number == ASM_SYS_VECTOR)
#ifdef TEST_RAW_EXCEPTION_CODE
recoverable = 1;
#else
recoverable = 0;
#endif
if (!recoverable) {
if (id) {
printk("Suspending faulting task (0x%08x)\n", id);
/* Unnest here because rtems_task_suspend() never returns */
nest--;
rtems_task_suspend(id);
} else {
printk("unrecoverable exception!!! Push reset button\n");
while (1);
}
} else {
nest--;
}
}
