1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
432 lines
10 KiB
C
432 lines
10 KiB
C
/* traps.c: high-level exception handler for FR-V
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*
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* Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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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
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/sched.h>
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#include <linux/signal.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/types.h>
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#include <linux/user.h>
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#include <linux/string.h>
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <asm/setup.h>
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#include <asm/fpu.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/siginfo.h>
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#include <asm/unaligned.h>
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void show_backtrace(struct pt_regs *, unsigned long);
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extern asmlinkage void __break_hijack_kernel_event(void);
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/*****************************************************************************/
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/*
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* instruction access error
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*/
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asmlinkage void insn_access_error(unsigned long esfr1, unsigned long epcr0, unsigned long esr0)
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{
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siginfo_t info;
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die_if_kernel("-- Insn Access Error --\n"
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"EPCR0 : %08lx\n"
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"ESR0 : %08lx\n",
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epcr0, esr0);
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info.si_signo = SIGSEGV;
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info.si_code = SEGV_ACCERR;
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info.si_errno = 0;
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info.si_addr = (void *) ((epcr0 & EPCR0_V) ? (epcr0 & EPCR0_PC) : __frame->pc);
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force_sig_info(info.si_signo, &info, current);
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} /* end insn_access_error() */
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/*****************************************************************************/
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/*
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* handler for:
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* - illegal instruction
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* - privileged instruction
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* - unsupported trap
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* - debug exceptions
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*/
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asmlinkage void illegal_instruction(unsigned long esfr1, unsigned long epcr0, unsigned long esr0)
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{
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siginfo_t info;
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die_if_kernel("-- Illegal Instruction --\n"
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"EPCR0 : %08lx\n"
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"ESR0 : %08lx\n"
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"ESFR1 : %08lx\n",
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epcr0, esr0, esfr1);
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info.si_errno = 0;
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info.si_addr = (void *) ((epcr0 & EPCR0_PC) ? (epcr0 & EPCR0_PC) : __frame->pc);
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switch (__frame->tbr & TBR_TT) {
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case TBR_TT_ILLEGAL_INSTR:
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info.si_signo = SIGILL;
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info.si_code = ILL_ILLOPC;
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break;
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case TBR_TT_PRIV_INSTR:
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info.si_signo = SIGILL;
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info.si_code = ILL_PRVOPC;
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break;
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case TBR_TT_TRAP2 ... TBR_TT_TRAP126:
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info.si_signo = SIGILL;
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info.si_code = ILL_ILLTRP;
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break;
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/* GDB uses "tira gr0, #1" as a breakpoint instruction. */
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case TBR_TT_TRAP1:
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case TBR_TT_BREAK:
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info.si_signo = SIGTRAP;
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info.si_code =
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(__frame->__status & REG__STATUS_STEPPED) ? TRAP_TRACE : TRAP_BRKPT;
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break;
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}
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force_sig_info(info.si_signo, &info, current);
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} /* end illegal_instruction() */
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/*****************************************************************************/
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/*
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*
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*/
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asmlinkage void media_exception(unsigned long msr0, unsigned long msr1)
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{
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siginfo_t info;
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die_if_kernel("-- Media Exception --\n"
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"MSR0 : %08lx\n"
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"MSR1 : %08lx\n",
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msr0, msr1);
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info.si_signo = SIGFPE;
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info.si_code = FPE_MDAOVF;
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info.si_errno = 0;
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info.si_addr = (void *) __frame->pc;
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force_sig_info(info.si_signo, &info, current);
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} /* end media_exception() */
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/*****************************************************************************/
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/*
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* instruction or data access exception
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*/
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asmlinkage void memory_access_exception(unsigned long esr0,
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unsigned long ear0,
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unsigned long epcr0)
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{
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siginfo_t info;
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#ifdef CONFIG_MMU
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unsigned long fixup;
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if ((esr0 & ESRx_EC) == ESRx_EC_DATA_ACCESS)
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if (handle_misalignment(esr0, ear0, epcr0) == 0)
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return;
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if ((fixup = search_exception_table(__frame->pc)) != 0) {
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__frame->pc = fixup;
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return;
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}
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#endif
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die_if_kernel("-- Memory Access Exception --\n"
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"ESR0 : %08lx\n"
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"EAR0 : %08lx\n"
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"EPCR0 : %08lx\n",
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esr0, ear0, epcr0);
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info.si_signo = SIGSEGV;
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info.si_code = SEGV_ACCERR;
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info.si_errno = 0;
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info.si_addr = NULL;
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if ((esr0 & (ESRx_VALID | ESR0_EAV)) == (ESRx_VALID | ESR0_EAV))
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info.si_addr = (void *) ear0;
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force_sig_info(info.si_signo, &info, current);
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} /* end memory_access_exception() */
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/*****************************************************************************/
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/*
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* data access error
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* - double-word data load from CPU control area (0xFExxxxxx)
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* - read performed on inactive or self-refreshing SDRAM
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* - error notification from slave device
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* - misaligned address
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* - access to out of bounds memory region
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* - user mode accessing privileged memory region
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* - write to R/O memory region
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*/
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asmlinkage void data_access_error(unsigned long esfr1, unsigned long esr15, unsigned long ear15)
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{
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siginfo_t info;
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die_if_kernel("-- Data Access Error --\n"
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"ESR15 : %08lx\n"
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"EAR15 : %08lx\n",
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esr15, ear15);
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info.si_signo = SIGSEGV;
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info.si_code = SEGV_ACCERR;
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info.si_errno = 0;
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info.si_addr = (void *)
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(((esr15 & (ESRx_VALID|ESR15_EAV)) == (ESRx_VALID|ESR15_EAV)) ? ear15 : 0);
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force_sig_info(info.si_signo, &info, current);
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} /* end data_access_error() */
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/*****************************************************************************/
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/*
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* data store error - should only happen if accessing inactive or self-refreshing SDRAM
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*/
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asmlinkage void data_store_error(unsigned long esfr1, unsigned long esr15)
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{
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die_if_kernel("-- Data Store Error --\n"
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"ESR15 : %08lx\n",
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esr15);
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BUG();
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} /* end data_store_error() */
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/*****************************************************************************/
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/*
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*
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*/
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asmlinkage void division_exception(unsigned long esfr1, unsigned long esr0, unsigned long isr)
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{
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siginfo_t info;
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die_if_kernel("-- Division Exception --\n"
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"ESR0 : %08lx\n"
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"ISR : %08lx\n",
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esr0, isr);
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info.si_signo = SIGFPE;
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info.si_code = FPE_INTDIV;
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info.si_errno = 0;
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info.si_addr = (void *) __frame->pc;
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force_sig_info(info.si_signo, &info, current);
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} /* end division_exception() */
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/*****************************************************************************/
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/*
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*
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*/
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asmlinkage void compound_exception(unsigned long esfr1,
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unsigned long esr0, unsigned long esr14, unsigned long esr15,
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unsigned long msr0, unsigned long msr1)
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{
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die_if_kernel("-- Compound Exception --\n"
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"ESR0 : %08lx\n"
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"ESR15 : %08lx\n"
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"ESR15 : %08lx\n"
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"MSR0 : %08lx\n"
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"MSR1 : %08lx\n",
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esr0, esr14, esr15, msr0, msr1);
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BUG();
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} /* end compound_exception() */
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/*****************************************************************************/
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/*
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* The architecture-independent backtrace generator
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*/
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void dump_stack(void)
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{
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show_stack(NULL, NULL);
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}
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void show_stack(struct task_struct *task, unsigned long *sp)
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{
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}
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void show_trace_task(struct task_struct *tsk)
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{
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printk("CONTEXT: stack=0x%lx frame=0x%p LR=0x%lx RET=0x%lx\n",
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tsk->thread.sp, tsk->thread.frame, tsk->thread.lr, tsk->thread.sched_lr);
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}
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static const char *regnames[] = {
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"PSR ", "ISR ", "CCR ", "CCCR",
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"LR ", "LCR ", "PC ", "_stt",
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"sys ", "GR8*", "GNE0", "GNE1",
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"IACH", "IACL",
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"TBR ", "SP ", "FP ", "GR3 ",
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"GR4 ", "GR5 ", "GR6 ", "GR7 ",
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"GR8 ", "GR9 ", "GR10", "GR11",
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"GR12", "GR13", "GR14", "GR15",
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"GR16", "GR17", "GR18", "GR19",
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"GR20", "GR21", "GR22", "GR23",
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"GR24", "GR25", "GR26", "GR27",
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"EFRM", "CURR", "GR30", "BFRM"
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};
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void show_regs(struct pt_regs *regs)
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{
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uint32_t *reg;
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int loop;
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printk("\n");
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printk("Frame: @%08x [%s]\n",
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(uint32_t) regs,
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regs->psr & PSR_S ? "kernel" : "user");
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reg = (uint32_t *) regs;
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for (loop = 0; loop < REG__END; loop++) {
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printk("%s %08x", regnames[loop + 0], reg[loop + 0]);
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if (loop == REG__END - 1 || loop % 5 == 4)
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printk("\n");
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else
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printk(" | ");
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}
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printk("Process %s (pid: %d)\n", current->comm, current->pid);
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}
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void die_if_kernel(const char *str, ...)
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{
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char buffer[256];
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va_list va;
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if (user_mode(__frame))
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return;
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va_start(va, str);
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vsprintf(buffer, str, va);
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va_end(va);
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console_verbose();
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printk("\n===================================\n");
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printk("%s\n", buffer);
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show_backtrace(__frame, 0);
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__break_hijack_kernel_event();
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do_exit(SIGSEGV);
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}
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/*****************************************************************************/
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/*
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* dump the contents of an exception frame
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*/
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static void show_backtrace_regs(struct pt_regs *frame)
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{
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uint32_t *reg;
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int loop;
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/* print the registers for this frame */
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printk("<-- %s Frame: @%p -->\n",
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frame->psr & PSR_S ? "Kernel Mode" : "User Mode",
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frame);
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reg = (uint32_t *) frame;
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for (loop = 0; loop < REG__END; loop++) {
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printk("%s %08x", regnames[loop + 0], reg[loop + 0]);
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if (loop == REG__END - 1 || loop % 5 == 4)
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printk("\n");
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else
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printk(" | ");
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}
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printk("--------\n");
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} /* end show_backtrace_regs() */
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/*****************************************************************************/
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/*
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* generate a backtrace of the kernel stack
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*/
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void show_backtrace(struct pt_regs *frame, unsigned long sp)
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{
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struct pt_regs *frame0;
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unsigned long tos = 0, stop = 0, base;
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int format;
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base = ((((unsigned long) frame) + 8191) & ~8191) - sizeof(struct user_context);
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frame0 = (struct pt_regs *) base;
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if (sp) {
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tos = sp;
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stop = (unsigned long) frame;
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}
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printk("\nProcess %s (pid: %d)\n\n", current->comm, current->pid);
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for (;;) {
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/* dump stack segment between frames */
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//printk("%08lx -> %08lx\n", tos, stop);
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format = 0;
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while (tos < stop) {
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if (format == 0)
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printk(" %04lx :", tos & 0xffff);
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printk(" %08lx", *(unsigned long *) tos);
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tos += 4;
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format++;
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if (format == 8) {
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printk("\n");
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format = 0;
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}
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}
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if (format > 0)
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printk("\n");
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/* dump frame 0 outside of the loop */
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if (frame == frame0)
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break;
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tos = frame->sp;
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if (((unsigned long) frame) + sizeof(*frame) != tos) {
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printk("-- TOS %08lx does not follow frame %p --\n",
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tos, frame);
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break;
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}
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show_backtrace_regs(frame);
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/* dump the stack between this frame and the next */
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stop = (unsigned long) frame->next_frame;
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if (stop != base &&
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(stop < tos ||
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stop > base ||
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(stop < base && stop + sizeof(*frame) > base) ||
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stop & 3)) {
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printk("-- next_frame %08lx is invalid (range %08lx-%08lx) --\n",
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stop, tos, base);
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break;
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}
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/* move to next frame */
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frame = frame->next_frame;
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}
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/* we can always dump frame 0, even if the rest of the stack is corrupt */
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show_backtrace_regs(frame0);
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} /* end show_backtrace() */
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/*****************************************************************************/
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/*
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* initialise traps
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*/
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void __init trap_init (void)
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{
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} /* end trap_init() */
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