2 * linux/arch/ppc/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
37 #include <asm/processor.h>
39 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
40 int (*debugger_exception_handler)(struct pt_regs *) = 0;
43 /* Returns 0 if exception not found and fixup otherwise. */
44 extern unsigned long search_exception_table(unsigned long);
46 /* THIS NEEDS CHANGING to use the board info structure.
48 #define END_OF_MEM 0x00400000
51 static __inline__ void set_tsr(unsigned long val)
53 #if defined(CONFIG_440)
54 asm volatile("mtspr 0x150, %0" : : "r" (val));
56 asm volatile("mttsr %0" : : "r" (val));
60 static __inline__ unsigned long get_esr(void)
64 #if defined(CONFIG_440)
65 asm volatile("mfspr %0, 0x03e" : "=r" (val) :);
67 asm volatile("mfesr %0" : "=r" (val) :);
72 #define ESR_MCI 0x80000000
73 #define ESR_PIL 0x08000000
74 #define ESR_PPR 0x04000000
75 #define ESR_PTR 0x02000000
76 #define ESR_DST 0x00800000
77 #define ESR_DIZ 0x00400000
78 #define ESR_U0F 0x00008000
80 #if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
81 extern void do_bedbug_breakpoint(struct pt_regs *);
85 * Trap & Exception support
89 print_backtrace(unsigned long *sp)
94 printf("Call backtrace: ");
96 if ((uint)sp > END_OF_MEM)
104 sp = (unsigned long *)*sp;
109 void show_regs(struct pt_regs * regs)
113 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
114 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
115 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
116 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
117 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
118 regs->msr&MSR_IR ? 1 : 0,
119 regs->msr&MSR_DR ? 1 : 0);
122 for (i = 0; i < 32; i++) {
125 printf("GPR%02d: ", i);
128 printf("%08lX ", regs->gpr[i]);
138 _exception(int signr, struct pt_regs *regs)
141 print_backtrace((unsigned long *)regs->gpr[1]);
142 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
146 MachineCheckException(struct pt_regs *regs)
150 /* Probing PCI using config cycles cause this exception
151 * when a device is not present. Catch it and return to
152 * the PCI exception handler.
154 if ((fixup = search_exception_table(regs->nip)) != 0) {
159 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
160 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
164 printf("Machine check in kernel mode.\n");
165 printf("Caused by (from msr): ");
166 printf("regs %p ",regs);
167 switch( regs->msr & 0x0000F000)
170 printf("Machine check signal - probably due to mm fault\n"
174 printf("Transfer error ack signal\n");
177 printf("Data parity signal\n");
180 printf("Address parity signal\n");
183 printf("Unknown values in msr\n");
186 print_backtrace((unsigned long *)regs->gpr[1]);
187 panic("machine check");
191 AlignmentException(struct pt_regs *regs)
193 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
194 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
199 print_backtrace((unsigned long *)regs->gpr[1]);
200 panic("Alignment Exception");
204 ProgramCheckException(struct pt_regs *regs)
208 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
209 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
216 if( esr_val & ESR_PIL )
217 printf( "** Illegal Instruction **\n" );
218 else if( esr_val & ESR_PPR )
219 printf( "** Privileged Instruction **\n" );
220 else if( esr_val & ESR_PTR )
221 printf( "** Trap Instruction **\n" );
223 print_backtrace((unsigned long *)regs->gpr[1]);
224 panic("Program Check Exception");
228 PITException(struct pt_regs *regs)
231 * Reset PIT interrupt
236 * Call timer_interrupt routine in interrupts.c
238 timer_interrupt(NULL);
243 UnknownException(struct pt_regs *regs)
245 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
246 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
250 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
251 regs->nip, regs->msr, regs->trap);
256 DebugException(struct pt_regs *regs)
258 printf("Debugger trap at @ %lx\n", regs->nip );
260 #if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
261 do_bedbug_breakpoint( regs );
265 /* Probe an address by reading. If not present, return -1, otherwise
269 addr_probe(uint *addr)
274 __asm__ __volatile__( \
275 "1: lwz %0,0(%1)\n" \
279 ".section .fixup,\"ax\"\n" \
282 ".section __ex_table,\"a\"\n" \
286 : "=r" (retval) : "r"(addr));