2 * (C) Copyright 2000 - 2007
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
7 * SPDX-License-Identifier: GPL-2.0+
9 * Derived from the MPC83xx code.
13 * This file handles the architecture-dependent parts of hardware
19 #include <asm/processor.h>
21 DECLARE_GLOBAL_DATA_PTR;
23 extern unsigned long search_exception_table(unsigned long);
26 * End of addressable memory. This may be less than the actual
27 * amount of memory on the system if we're unable to keep all
28 * the memory mapped in.
30 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
33 * Trap & Exception support
36 static void print_backtrace(unsigned long *sp)
41 puts("Call backtrace: ");
43 if ((uint)sp > END_OF_MEM)
51 sp = (unsigned long *) *sp;
56 void show_regs(struct pt_regs *regs)
60 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
61 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
62 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
63 regs->msr, regs->msr & MSR_EE ? 1 : 0, regs->msr & MSR_PR ? 1 : 0,
64 regs->msr & MSR_FP ? 1 : 0,regs->msr & MSR_ME ? 1 : 0,
65 regs->msr & MSR_IR ? 1 : 0,
66 regs->msr & MSR_DR ? 1 : 0);
69 for (i = 0; i < 32; i++) {
71 printf("GPR%02d: ", i);
74 printf("%08lX ", regs->gpr[i]);
82 static void _exception(int signr, struct pt_regs *regs)
85 print_backtrace((unsigned long *)regs->gpr[1]);
86 panic("Exception at pc %lx signal %d", regs->nip, signr);
90 void MachineCheckException(struct pt_regs *regs)
92 unsigned long fixup = search_exception_table(regs->nip);
99 #ifdef CONFIG_CMD_KGDB
100 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
104 puts("Machine check.\nCaused by (from msr): ");
105 printf("regs %p ", regs);
106 switch (regs->msr & 0x00FF0000) {
107 case (0x80000000 >> 10):
108 puts("Instruction cache parity signal\n");
110 case (0x80000000 >> 11):
111 puts("Data cache parity signal\n");
113 case (0x80000000 >> 12):
114 puts("Machine check signal\n");
116 case (0x80000000 >> 13):
117 puts("Transfer error ack signal\n");
119 case (0x80000000 >> 14):
120 puts("Data parity signal\n");
122 case (0x80000000 >> 15):
123 puts("Address parity signal\n");
126 puts("Unknown values in msr\n");
129 print_backtrace((unsigned long *)regs->gpr[1]);
131 panic("machine check");
134 void AlignmentException(struct pt_regs *regs)
136 #ifdef CONFIG_CMD_KGDB
137 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
141 print_backtrace((unsigned long *)regs->gpr[1]);
142 panic("Alignment Exception");
145 void ProgramCheckException(struct pt_regs *regs)
147 #ifdef CONFIG_CMD_KGDB
148 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
152 print_backtrace((unsigned long *)regs->gpr[1]);
153 panic("Program Check Exception");
156 void SoftEmuException(struct pt_regs *regs)
158 #ifdef CONFIG_CMD_KGDB
159 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
163 print_backtrace((unsigned long *)regs->gpr[1]);
164 panic("Software Emulation Exception");
168 void UnknownException(struct pt_regs *regs)
170 #ifdef CONFIG_CMD_KGDB
171 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
174 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
175 regs->nip, regs->msr, regs->trap);
179 #ifdef CONFIG_CMD_BEDBUG
180 extern void do_bedbug_breakpoint(struct pt_regs *);
183 void DebugException(struct pt_regs *regs)
185 printf("Debugger trap at @ %lx\n", regs->nip);
187 #ifdef CONFIG_CMD_BEDBUG
188 do_bedbug_breakpoint(regs);