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https://github.com/brain-hackers/u-boot-brain
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![Becky Bruce](/assets/img/avatar_default.png)
Currently, END_OF_RAM is used by the trap code to determine if we should attempt to access the stack pointer or not. However, on systems with a lot of RAM, only a subset of the RAM is guaranteed to be mapped in and accessible. Change END_OF_RAM to use get_effective_memsize() instead of using the raw ram size out of the bd. Signed-off-by: Becky Bruce <becky.bruce@freescale.com>
212 lines
4.8 KiB
C
212 lines
4.8 KiB
C
/*
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* (C) Copyright 2000 - 2007
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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* Derived from the MPC83xx code.
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*/
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/*
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* This file handles the architecture-dependent parts of hardware
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* exceptions
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*/
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#include <common.h>
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#include <asm/processor.h>
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DECLARE_GLOBAL_DATA_PTR;
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extern unsigned long search_exception_table(unsigned long);
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/*
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* End of addressable memory. This may be less than the actual
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* amount of memory on the system if we're unable to keep all
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* the memory mapped in.
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*/
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extern ulong get_effective_memsize(void);
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#define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
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/*
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* Trap & Exception support
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*/
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void
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print_backtrace (unsigned long *sp)
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{
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int cnt = 0;
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unsigned long i;
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puts ("Call backtrace: ");
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while (sp) {
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if ((uint)sp > END_OF_MEM)
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break;
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i = sp[1];
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if (cnt++ % 7 == 0)
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putc ('\n');
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printf ("%08lX ", i);
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if (cnt > 32) break;
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sp = (unsigned long *) *sp;
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}
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putc ('\n');
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}
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void show_regs (struct pt_regs * regs)
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{
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int i;
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printf ("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
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regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
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printf ("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
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regs->msr, regs->msr & MSR_EE ? 1 : 0, regs->msr & MSR_PR ? 1 : 0,
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regs->msr & MSR_FP ? 1 : 0,regs->msr & MSR_ME ? 1 : 0,
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regs->msr & MSR_IR ? 1 : 0,
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regs->msr & MSR_DR ? 1 : 0);
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putc ('\n');
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for (i = 0; i < 32; i++) {
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if ((i % 8) == 0) {
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printf ("GPR%02d: ", i);
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}
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printf ("%08lX ", regs->gpr[i]);
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if ((i % 8) == 7) {
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putc ('\n');
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}
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}
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}
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void
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_exception (int signr, struct pt_regs *regs)
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{
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show_regs (regs);
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print_backtrace ((unsigned long *)regs->gpr[1]);
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panic ("Exception at pc %lx signal %d", regs->nip,signr);
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}
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void
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MachineCheckException (struct pt_regs *regs)
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{
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unsigned long fixup;
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if ((fixup = search_exception_table (regs->nip)) != 0) {
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regs->nip = fixup;
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return;
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}
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#ifdef CONFIG_CMD_KGDB
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if (debugger_exception_handler && (*debugger_exception_handler)(regs))
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return;
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#endif
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puts ("Machine check.\nCaused by (from msr): ");
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printf ("regs %p ",regs);
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switch (regs->msr & 0x00FF0000) {
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case (0x80000000 >> 10):
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puts ("Instruction cache parity signal\n");
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break;
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case (0x80000000 >> 11):
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puts ("Data cache parity signal\n");
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break;
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case (0x80000000 >> 12):
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puts ("Machine check signal\n");
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break;
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case (0x80000000 >> 13):
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puts ("Transfer error ack signal\n");
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break;
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case (0x80000000 >> 14):
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puts ("Data parity signal\n");
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break;
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case (0x80000000 >> 15):
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puts ("Address parity signal\n");
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break;
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default:
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puts ("Unknown values in msr\n");
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}
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show_regs (regs);
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print_backtrace ((unsigned long *)regs->gpr[1]);
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panic ("machine check");
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}
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void
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AlignmentException (struct pt_regs *regs)
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{
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#ifdef CONFIG_CMD_KGDB
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if (debugger_exception_handler && (*debugger_exception_handler)(regs))
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return;
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#endif
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show_regs (regs);
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print_backtrace ((unsigned long *)regs->gpr[1]);
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panic ("Alignment Exception");
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}
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void
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ProgramCheckException (struct pt_regs *regs)
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{
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#ifdef CONFIG_CMD_KGDB
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if (debugger_exception_handler && (*debugger_exception_handler)(regs))
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return;
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#endif
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show_regs (regs);
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print_backtrace ((unsigned long *)regs->gpr[1]);
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panic ("Program Check Exception");
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}
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void
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SoftEmuException (struct pt_regs *regs)
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{
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#ifdef CONFIG_CMD_KGDB
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if (debugger_exception_handler && (*debugger_exception_handler)(regs))
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return;
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#endif
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show_regs (regs);
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print_backtrace ((unsigned long *)regs->gpr[1]);
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panic ("Software Emulation Exception");
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}
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void
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UnknownException (struct pt_regs *regs)
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{
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#ifdef CONFIG_CMD_KGDB
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if (debugger_exception_handler && (*debugger_exception_handler)(regs))
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return;
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#endif
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printf ("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
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regs->nip, regs->msr, regs->trap);
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_exception (0, regs);
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}
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#ifdef CONFIG_CMD_BEDBUG
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extern void do_bedbug_breakpoint (struct pt_regs *);
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#endif
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void
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DebugException (struct pt_regs *regs)
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{
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printf ("Debugger trap at @ %lx\n", regs->nip );
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show_regs (regs);
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#ifdef CONFIG_CMD_BEDBUG
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do_bedbug_breakpoint (regs);
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#endif
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}
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