2 * linux/arch/powerpc/kernel/traps.c
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 * Modified by Cort Dougan (cort@cs.nmt.edu)
7 * and Paul Mackerras (paulus@cs.anu.edu.au)
10 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
12 * See file CREDITS for list of people who contributed to this
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation; either version 2 of
18 * the License, or (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
32 * This file handles the architecture-dependent parts of hardware exceptions
38 #include <asm/processor.h>
40 DECLARE_GLOBAL_DATA_PTR;
42 /* Returns 0 if exception not found and fixup otherwise. */
43 extern unsigned long search_exception_table(unsigned long);
45 /* THIS NEEDS CHANGING to use the board info structure.
47 #define END_OF_MEM (gd->bd->bi_memstart + gd->bd->bi_memsize)
49 static __inline__ unsigned long get_esr(void)
53 #if defined(CONFIG_440)
54 asm volatile("mfspr %0, 0x03e" : "=r" (val) :);
56 asm volatile("mfesr %0" : "=r" (val) :);
61 #define ESR_MCI 0x80000000
62 #define ESR_PIL 0x08000000
63 #define ESR_PPR 0x04000000
64 #define ESR_PTR 0x02000000
65 #define ESR_DST 0x00800000
66 #define ESR_DIZ 0x00400000
67 #define ESR_U0F 0x00008000
69 #if defined(CONFIG_CMD_BEDBUG)
70 extern void do_bedbug_breakpoint(struct pt_regs *);
74 * Trap & Exception support
77 static void print_backtrace(unsigned long *sp)
82 printf("Call backtrace: ");
84 if ((uint)sp > END_OF_MEM)
92 sp = (unsigned long *)*sp;
97 void show_regs(struct pt_regs *regs)
101 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DEAR: %08lX\n",
102 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
103 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
104 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
105 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
106 regs->msr&MSR_IR ? 1 : 0,
107 regs->msr&MSR_DR ? 1 : 0);
110 for (i = 0; i < 32; i++) {
112 printf("GPR%02d: ", i);
115 printf("%08lX ", regs->gpr[i]);
123 static void _exception(int signr, struct pt_regs *regs)
126 print_backtrace((unsigned long *)regs->gpr[1]);
130 void MachineCheckException(struct pt_regs *regs)
132 unsigned long fixup, val;
133 #if defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
139 if ((fixup = search_exception_table(regs->nip)) != 0) {
143 mtspr(SPRN_MCSR, val);
147 #if defined(CONFIG_CMD_KGDB)
148 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
152 printf("Machine Check Exception.\n");
153 printf("Caused by (from msr): ");
154 printf("regs %p ", regs);
158 #if !defined(CONFIG_440) && !defined(CONFIG_405EX)
160 printf("Instruction");
161 mtspr(ESR, val & ~ESR_IMCP);
165 printf(" machine check.\n");
167 #elif defined(CONFIG_440) || defined(CONFIG_405EX)
169 printf("Instruction Synchronous Machine Check exception\n");
170 mtspr(SPRN_ESR, val & ~ESR_IMCP);
174 printf("Instruction Read PLB Error\n");
175 #if defined(CONFIG_440)
177 printf("Data Read PLB Error\n");
179 printf("Data Write PLB Error\n");
182 printf("Data PLB Error\n");
185 printf("TLB Parity Error\n");
187 /*flush_instruction_cache(); */
188 printf("I-Cache Parity Error\n");
191 printf("D-Cache Search Parity Error\n");
193 printf("D-Cache Flush Parity Error\n");
195 printf("Machine Check exception is imprecise\n");
198 mtspr(SPRN_MCSR, val);
201 #if defined(CONFIG_DDR_ECC) && defined(CONFIG_SDRAM_PPC4xx_IBM_DDR2)
203 * Read and print ECC status register/info:
204 * The faulting address is only known upon uncorrectable ECC
207 mfsdram(SDRAM_ECCES, val);
208 if (val & SDRAM_ECCES_CE)
209 printf("ECC: Correctable error\n");
210 if (val & SDRAM_ECCES_UE) {
211 printf("ECC: Uncorrectable error at 0x%02x%08x\n",
212 mfdcr(SDRAM_ERRADDULL), mfdcr(SDRAM_ERRADDLLL));
214 #endif /* CONFIG_DDR_ECC ... */
216 #if defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
217 mfsdram(DDR0_00, val) ;
218 printf("DDR0: DDR0_00 %lx\n", val);
219 val = (val >> 16) & 0xff;
221 printf("DDR0: At least one interrupt active\n");
223 printf("DDR0: DRAM initialization complete.\n");
225 printf("DDR0: Multiple uncorrectable ECC events.\n");
229 printf("DDR0: Single uncorrectable ECC event.\n");
233 printf("DDR0: Multiple correctable ECC events.\n");
237 printf("DDR0: Single correctable ECC event.\n");
241 printf("Multiple accesses outside the defined"
242 " physical memory space detected\n");
244 printf("DDR0: Single access outside the defined"
245 " physical memory space detected.\n");
247 mfsdram(DDR0_01, val);
248 val = (val >> 8) & 0x7;
251 printf("DDR0: Write Out-of-Range command\n");
254 printf("DDR0: Read Out-of-Range command\n");
257 printf("DDR0: Masked write Out-of-Range command\n");
260 printf("DDR0: Wrap write Out-of-Range command\n");
263 printf("DDR0: Wrap read Out-of-Range command\n");
266 mfsdram(DDR0_01, value2);
267 printf("DDR0: No DDR0 error know 0x%lx %x\n", val, value2);
269 mfsdram(DDR0_23, val);
270 if (((val >> 16) & 0xff) && corr_ecc)
271 printf("DDR0: Syndrome for correctable ECC event 0x%lx\n",
273 mfsdram(DDR0_23, val);
274 if (((val >> 8) & 0xff) && uncorr_ecc)
275 printf("DDR0: Syndrome for uncorrectable ECC event 0x%lx\n",
277 mfsdram(DDR0_33, val);
279 printf("DDR0: Address of command that caused an "
280 "Out-of-Range interrupt %lx\n", val);
281 mfsdram(DDR0_34, val);
282 if (val && uncorr_ecc)
283 printf("DDR0: Address of uncorrectable ECC event %lx\n", val);
284 mfsdram(DDR0_35, val);
285 if (val && uncorr_ecc)
286 printf("DDR0: Address of uncorrectable ECC event %lx\n", val);
287 mfsdram(DDR0_36, val);
288 if (val && uncorr_ecc)
289 printf("DDR0: Data of uncorrectable ECC event 0x%08lx\n", val);
290 mfsdram(DDR0_37, val);
291 if (val && uncorr_ecc)
292 printf("DDR0: Data of uncorrectable ECC event 0x%08lx\n", val);
293 mfsdram(DDR0_38, val);
295 printf("DDR0: Address of correctable ECC event %lx\n", val);
296 mfsdram(DDR0_39, val);
298 printf("DDR0: Address of correctable ECC event %lx\n", val);
299 mfsdram(DDR0_40, val);
301 printf("DDR0: Data of correctable ECC event 0x%08lx\n", val);
302 mfsdram(DDR0_41, val);
304 printf("DDR0: Data of correctable ECC event 0x%08lx\n", val);
305 #endif /* CONFIG_440EPX */
306 #endif /* CONFIG_440 */
308 print_backtrace((unsigned long *)regs->gpr[1]);
309 panic("machine check");
312 void AlignmentException(struct pt_regs *regs)
314 #if defined(CONFIG_CMD_KGDB)
315 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
320 print_backtrace((unsigned long *)regs->gpr[1]);
321 panic("Alignment Exception");
324 void ProgramCheckException(struct pt_regs *regs)
328 #if defined(CONFIG_CMD_KGDB)
329 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
336 if( esr_val & ESR_PIL )
337 printf( "** Illegal Instruction **\n" );
338 else if( esr_val & ESR_PPR )
339 printf( "** Privileged Instruction **\n" );
340 else if( esr_val & ESR_PTR )
341 printf( "** Trap Instruction **\n" );
343 print_backtrace((unsigned long *)regs->gpr[1]);
344 panic("Program Check Exception");
347 void DecrementerPITException(struct pt_regs *regs)
350 * Reset PIT interrupt
352 mtspr(SPRN_TSR, 0x08000000);
355 * Call timer_interrupt routine in interrupts.c
357 timer_interrupt(NULL);
361 void UnknownException(struct pt_regs *regs)
363 #if defined(CONFIG_CMD_KGDB)
364 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
368 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
369 regs->nip, regs->msr, regs->trap);
373 void DebugException(struct pt_regs *regs)
375 printf("Debugger trap at @ %lx\n", regs->nip );
377 #if defined(CONFIG_CMD_BEDBUG)
378 do_bedbug_breakpoint( regs );
382 /* Probe an address by reading. If not present, return -1, otherwise
386 addr_probe(uint *addr)
391 __asm__ __volatile__( \
392 "1: lwz %0,0(%1)\n" \
396 ".section .fixup,\"ax\"\n" \
399 ".section __ex_table,\"a\"\n" \
403 : "=r" (retval) : "r"(addr));