0e25498f8c
There are two big uses of do_exit. The first is it's design use to be the guts of the exit(2) system call. The second use is to terminate a task after something catastrophic has happened like a NULL pointer in kernel code. Add a function make_task_dead that is initialy exactly the same as do_exit to cover the cases where do_exit is called to handle catastrophic failure. In time this can probably be reduced to just a light wrapper around do_task_dead. For now keep it exactly the same so that there will be no behavioral differences introducing this new concept. Replace all of the uses of do_exit that use it for catastraphic task cleanup with make_task_dead to make it clear what the code is doing. As part of this rename rewind_stack_do_exit rewind_stack_and_make_dead. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
1157 lines
30 KiB
C
1157 lines
30 KiB
C
/*
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* linux/arch/m68k/kernel/traps.c
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*
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* Copyright (C) 1993, 1994 by Hamish Macdonald
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*
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* 68040 fixes by Michael Rausch
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* 68040 fixes by Martin Apel
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* 68040 fixes and writeback by Richard Zidlicky
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* 68060 fixes by Roman Hodek
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* 68060 fixes by Jesper Skov
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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/*
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* Sets up all exception vectors
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*/
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#include <linux/sched.h>
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#include <linux/sched/debug.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/module.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 <linux/ptrace.h>
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#include <linux/kallsyms.h>
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#include <asm/setup.h>
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#include <asm/fpu.h>
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#include <linux/uaccess.h>
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#include <asm/traps.h>
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#include <asm/machdep.h>
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#include <asm/siginfo.h>
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#include <asm/tlbflush.h>
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static const char *vec_names[] = {
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[VEC_RESETSP] = "RESET SP",
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[VEC_RESETPC] = "RESET PC",
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[VEC_BUSERR] = "BUS ERROR",
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[VEC_ADDRERR] = "ADDRESS ERROR",
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[VEC_ILLEGAL] = "ILLEGAL INSTRUCTION",
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[VEC_ZERODIV] = "ZERO DIVIDE",
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[VEC_CHK] = "CHK",
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[VEC_TRAP] = "TRAPcc",
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[VEC_PRIV] = "PRIVILEGE VIOLATION",
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[VEC_TRACE] = "TRACE",
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[VEC_LINE10] = "LINE 1010",
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[VEC_LINE11] = "LINE 1111",
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[VEC_RESV12] = "UNASSIGNED RESERVED 12",
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[VEC_COPROC] = "COPROCESSOR PROTOCOL VIOLATION",
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[VEC_FORMAT] = "FORMAT ERROR",
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[VEC_UNINT] = "UNINITIALIZED INTERRUPT",
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[VEC_RESV16] = "UNASSIGNED RESERVED 16",
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[VEC_RESV17] = "UNASSIGNED RESERVED 17",
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[VEC_RESV18] = "UNASSIGNED RESERVED 18",
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[VEC_RESV19] = "UNASSIGNED RESERVED 19",
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[VEC_RESV20] = "UNASSIGNED RESERVED 20",
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[VEC_RESV21] = "UNASSIGNED RESERVED 21",
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[VEC_RESV22] = "UNASSIGNED RESERVED 22",
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[VEC_RESV23] = "UNASSIGNED RESERVED 23",
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[VEC_SPUR] = "SPURIOUS INTERRUPT",
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[VEC_INT1] = "LEVEL 1 INT",
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[VEC_INT2] = "LEVEL 2 INT",
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[VEC_INT3] = "LEVEL 3 INT",
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[VEC_INT4] = "LEVEL 4 INT",
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[VEC_INT5] = "LEVEL 5 INT",
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[VEC_INT6] = "LEVEL 6 INT",
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[VEC_INT7] = "LEVEL 7 INT",
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[VEC_SYS] = "SYSCALL",
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[VEC_TRAP1] = "TRAP #1",
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[VEC_TRAP2] = "TRAP #2",
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[VEC_TRAP3] = "TRAP #3",
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[VEC_TRAP4] = "TRAP #4",
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[VEC_TRAP5] = "TRAP #5",
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[VEC_TRAP6] = "TRAP #6",
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[VEC_TRAP7] = "TRAP #7",
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[VEC_TRAP8] = "TRAP #8",
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[VEC_TRAP9] = "TRAP #9",
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[VEC_TRAP10] = "TRAP #10",
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[VEC_TRAP11] = "TRAP #11",
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[VEC_TRAP12] = "TRAP #12",
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[VEC_TRAP13] = "TRAP #13",
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[VEC_TRAP14] = "TRAP #14",
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[VEC_TRAP15] = "TRAP #15",
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[VEC_FPBRUC] = "FPCP BSUN",
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[VEC_FPIR] = "FPCP INEXACT",
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[VEC_FPDIVZ] = "FPCP DIV BY 0",
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[VEC_FPUNDER] = "FPCP UNDERFLOW",
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[VEC_FPOE] = "FPCP OPERAND ERROR",
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[VEC_FPOVER] = "FPCP OVERFLOW",
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[VEC_FPNAN] = "FPCP SNAN",
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[VEC_FPUNSUP] = "FPCP UNSUPPORTED OPERATION",
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[VEC_MMUCFG] = "MMU CONFIGURATION ERROR",
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[VEC_MMUILL] = "MMU ILLEGAL OPERATION ERROR",
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[VEC_MMUACC] = "MMU ACCESS LEVEL VIOLATION ERROR",
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[VEC_RESV59] = "UNASSIGNED RESERVED 59",
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[VEC_UNIMPEA] = "UNASSIGNED RESERVED 60",
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[VEC_UNIMPII] = "UNASSIGNED RESERVED 61",
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[VEC_RESV62] = "UNASSIGNED RESERVED 62",
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[VEC_RESV63] = "UNASSIGNED RESERVED 63",
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};
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static const char *space_names[] = {
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[0] = "Space 0",
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[USER_DATA] = "User Data",
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[USER_PROGRAM] = "User Program",
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#ifndef CONFIG_SUN3
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[3] = "Space 3",
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#else
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[FC_CONTROL] = "Control",
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#endif
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[4] = "Space 4",
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[SUPER_DATA] = "Super Data",
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[SUPER_PROGRAM] = "Super Program",
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[CPU_SPACE] = "CPU"
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};
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void die_if_kernel(char *,struct pt_regs *,int);
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asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
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unsigned long error_code);
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int send_fault_sig(struct pt_regs *regs);
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asmlinkage void trap_c(struct frame *fp);
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#if defined (CONFIG_M68060)
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static inline void access_error060 (struct frame *fp)
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{
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unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */
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pr_debug("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
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if (fslw & MMU060_BPE) {
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/* branch prediction error -> clear branch cache */
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__asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
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"orl #0x00400000,%/d0\n\t"
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"movec %/d0,%/cacr"
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: : : "d0" );
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/* return if there's no other error */
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if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
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return;
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}
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if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
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unsigned long errorcode;
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unsigned long addr = fp->un.fmt4.effaddr;
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if (fslw & MMU060_MA)
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addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
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errorcode = 1;
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if (fslw & MMU060_DESC_ERR) {
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__flush_tlb040_one(addr);
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errorcode = 0;
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}
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if (fslw & MMU060_W)
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errorcode |= 2;
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pr_debug("errorcode = %ld\n", errorcode);
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do_page_fault(&fp->ptregs, addr, errorcode);
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} else if (fslw & (MMU060_SEE)){
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/* Software Emulation Error.
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* fault during mem_read/mem_write in ifpsp060/os.S
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*/
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send_fault_sig(&fp->ptregs);
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} else if (!(fslw & (MMU060_RE|MMU060_WE)) ||
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send_fault_sig(&fp->ptregs) > 0) {
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pr_err("pc=%#lx, fa=%#lx\n", fp->ptregs.pc,
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fp->un.fmt4.effaddr);
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pr_err("68060 access error, fslw=%lx\n", fslw);
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trap_c( fp );
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}
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}
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#endif /* CONFIG_M68060 */
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#if defined (CONFIG_M68040)
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static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
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{
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unsigned long mmusr;
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set_fc(wbs);
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if (iswrite)
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asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
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else
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asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
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asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
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set_fc(USER_DATA);
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return mmusr;
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}
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static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
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unsigned long wbd)
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{
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int res = 0;
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set_fc(wbs);
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switch (wbs & WBSIZ_040) {
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case BA_SIZE_BYTE:
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res = put_user(wbd & 0xff, (char __user *)wba);
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break;
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case BA_SIZE_WORD:
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res = put_user(wbd & 0xffff, (short __user *)wba);
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break;
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case BA_SIZE_LONG:
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res = put_user(wbd, (int __user *)wba);
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break;
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}
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set_fc(USER_DATA);
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pr_debug("do_040writeback1, res=%d\n", res);
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return res;
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}
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/* after an exception in a writeback the stack frame corresponding
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* to that exception is discarded, set a few bits in the old frame
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* to simulate what it should look like
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*/
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static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
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{
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fp->un.fmt7.faddr = wba;
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fp->un.fmt7.ssw = wbs & 0xff;
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if (wba != current->thread.faddr)
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fp->un.fmt7.ssw |= MA_040;
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}
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static inline void do_040writebacks(struct frame *fp)
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{
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int res = 0;
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#if 0
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if (fp->un.fmt7.wb1s & WBV_040)
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pr_err("access_error040: cannot handle 1st writeback. oops.\n");
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#endif
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if ((fp->un.fmt7.wb2s & WBV_040) &&
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!(fp->un.fmt7.wb2s & WBTT_040)) {
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res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
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fp->un.fmt7.wb2d);
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if (res)
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fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
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else
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fp->un.fmt7.wb2s = 0;
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}
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/* do the 2nd wb only if the first one was successful (except for a kernel wb) */
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if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
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res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
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fp->un.fmt7.wb3d);
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if (res)
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{
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fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
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fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
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fp->un.fmt7.wb3s &= (~WBV_040);
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fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
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fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
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}
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else
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fp->un.fmt7.wb3s = 0;
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}
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if (res)
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send_fault_sig(&fp->ptregs);
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}
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/*
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* called from sigreturn(), must ensure userspace code didn't
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* manipulate exception frame to circumvent protection, then complete
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* pending writebacks
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* we just clear TM2 to turn it into a userspace access
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*/
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asmlinkage void berr_040cleanup(struct frame *fp)
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{
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fp->un.fmt7.wb2s &= ~4;
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fp->un.fmt7.wb3s &= ~4;
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do_040writebacks(fp);
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}
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static inline void access_error040(struct frame *fp)
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{
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unsigned short ssw = fp->un.fmt7.ssw;
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unsigned long mmusr;
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pr_debug("ssw=%#x, fa=%#lx\n", ssw, fp->un.fmt7.faddr);
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pr_debug("wb1s=%#x, wb2s=%#x, wb3s=%#x\n", fp->un.fmt7.wb1s,
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fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
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pr_debug("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lx\n",
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fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
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fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
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if (ssw & ATC_040) {
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unsigned long addr = fp->un.fmt7.faddr;
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unsigned long errorcode;
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|
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/*
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* The MMU status has to be determined AFTER the address
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* has been corrected if there was a misaligned access (MA).
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*/
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if (ssw & MA_040)
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addr = (addr + 7) & -8;
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/* MMU error, get the MMUSR info for this access */
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mmusr = probe040(!(ssw & RW_040), addr, ssw);
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pr_debug("mmusr = %lx\n", mmusr);
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errorcode = 1;
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if (!(mmusr & MMU_R_040)) {
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/* clear the invalid atc entry */
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__flush_tlb040_one(addr);
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errorcode = 0;
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}
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|
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/* despite what documentation seems to say, RMW
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* accesses have always both the LK and RW bits set */
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if (!(ssw & RW_040) || (ssw & LK_040))
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errorcode |= 2;
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if (do_page_fault(&fp->ptregs, addr, errorcode)) {
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pr_debug("do_page_fault() !=0\n");
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if (user_mode(&fp->ptregs)){
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/* delay writebacks after signal delivery */
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pr_debug(".. was usermode - return\n");
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return;
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}
|
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/* disable writeback into user space from kernel
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* (if do_page_fault didn't fix the mapping,
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* the writeback won't do good)
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*/
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disable_wb:
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pr_debug(".. disabling wb2\n");
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if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
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fp->un.fmt7.wb2s &= ~WBV_040;
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if (fp->un.fmt7.wb3a == fp->un.fmt7.faddr)
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fp->un.fmt7.wb3s &= ~WBV_040;
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}
|
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} else {
|
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/* In case of a bus error we either kill the process or expect
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* the kernel to catch the fault, which then is also responsible
|
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* for cleaning up the mess.
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*/
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current->thread.signo = SIGBUS;
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current->thread.faddr = fp->un.fmt7.faddr;
|
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if (send_fault_sig(&fp->ptregs) >= 0)
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pr_err("68040 bus error (ssw=%x, faddr=%lx)\n", ssw,
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fp->un.fmt7.faddr);
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goto disable_wb;
|
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}
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|
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do_040writebacks(fp);
|
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}
|
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#endif /* CONFIG_M68040 */
|
|
|
|
#if defined(CONFIG_SUN3)
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#include <asm/sun3mmu.h>
|
|
|
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extern int mmu_emu_handle_fault (unsigned long, int, int);
|
|
|
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/* sun3 version of bus_error030 */
|
|
|
|
static inline void bus_error030 (struct frame *fp)
|
|
{
|
|
unsigned char buserr_type = sun3_get_buserr ();
|
|
unsigned long addr, errorcode;
|
|
unsigned short ssw = fp->un.fmtb.ssw;
|
|
extern unsigned long _sun3_map_test_start, _sun3_map_test_end;
|
|
|
|
if (ssw & (FC | FB))
|
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pr_debug("Instruction fault at %#010lx\n",
|
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ssw & FC ?
|
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fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
|
|
:
|
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fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
|
|
if (ssw & DF)
|
|
pr_debug("Data %s fault at %#010lx in %s (pc=%#lx)\n",
|
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ssw & RW ? "read" : "write",
|
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fp->un.fmtb.daddr,
|
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space_names[ssw & DFC], fp->ptregs.pc);
|
|
|
|
/*
|
|
* Check if this page should be demand-mapped. This needs to go before
|
|
* the testing for a bad kernel-space access (demand-mapping applies
|
|
* to kernel accesses too).
|
|
*/
|
|
|
|
if ((ssw & DF)
|
|
&& (buserr_type & (SUN3_BUSERR_PROTERR | SUN3_BUSERR_INVALID))) {
|
|
if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 0))
|
|
return;
|
|
}
|
|
|
|
/* Check for kernel-space pagefault (BAD). */
|
|
if (fp->ptregs.sr & PS_S) {
|
|
/* kernel fault must be a data fault to user space */
|
|
if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
|
|
// try checking the kernel mappings before surrender
|
|
if (mmu_emu_handle_fault (fp->un.fmtb.daddr, ssw & RW, 1))
|
|
return;
|
|
/* instruction fault or kernel data fault! */
|
|
if (ssw & (FC | FB))
|
|
pr_err("Instruction fault at %#010lx\n",
|
|
fp->ptregs.pc);
|
|
if (ssw & DF) {
|
|
/* was this fault incurred testing bus mappings? */
|
|
if((fp->ptregs.pc >= (unsigned long)&_sun3_map_test_start) &&
|
|
(fp->ptregs.pc <= (unsigned long)&_sun3_map_test_end)) {
|
|
send_fault_sig(&fp->ptregs);
|
|
return;
|
|
}
|
|
|
|
pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
|
|
ssw & RW ? "read" : "write",
|
|
fp->un.fmtb.daddr,
|
|
space_names[ssw & DFC], fp->ptregs.pc);
|
|
}
|
|
pr_err("BAD KERNEL BUSERR\n");
|
|
|
|
die_if_kernel("Oops", &fp->ptregs,0);
|
|
force_sig(SIGKILL);
|
|
return;
|
|
}
|
|
} else {
|
|
/* user fault */
|
|
if (!(ssw & (FC | FB)) && !(ssw & DF))
|
|
/* not an instruction fault or data fault! BAD */
|
|
panic ("USER BUSERR w/o instruction or data fault");
|
|
}
|
|
|
|
|
|
/* First handle the data fault, if any. */
|
|
if (ssw & DF) {
|
|
addr = fp->un.fmtb.daddr;
|
|
|
|
// errorcode bit 0: 0 -> no page 1 -> protection fault
|
|
// errorcode bit 1: 0 -> read fault 1 -> write fault
|
|
|
|
// (buserr_type & SUN3_BUSERR_PROTERR) -> protection fault
|
|
// (buserr_type & SUN3_BUSERR_INVALID) -> invalid page fault
|
|
|
|
if (buserr_type & SUN3_BUSERR_PROTERR)
|
|
errorcode = 0x01;
|
|
else if (buserr_type & SUN3_BUSERR_INVALID)
|
|
errorcode = 0x00;
|
|
else {
|
|
pr_debug("*** unexpected busfault type=%#04x\n",
|
|
buserr_type);
|
|
pr_debug("invalid %s access at %#lx from pc %#lx\n",
|
|
!(ssw & RW) ? "write" : "read", addr,
|
|
fp->ptregs.pc);
|
|
die_if_kernel ("Oops", &fp->ptregs, buserr_type);
|
|
force_sig (SIGBUS);
|
|
return;
|
|
}
|
|
|
|
//todo: wtf is RM bit? --m
|
|
if (!(ssw & RW) || ssw & RM)
|
|
errorcode |= 0x02;
|
|
|
|
/* Handle page fault. */
|
|
do_page_fault (&fp->ptregs, addr, errorcode);
|
|
|
|
/* Retry the data fault now. */
|
|
return;
|
|
}
|
|
|
|
/* Now handle the instruction fault. */
|
|
|
|
/* Get the fault address. */
|
|
if (fp->ptregs.format == 0xA)
|
|
addr = fp->ptregs.pc + 4;
|
|
else
|
|
addr = fp->un.fmtb.baddr;
|
|
if (ssw & FC)
|
|
addr -= 2;
|
|
|
|
if (buserr_type & SUN3_BUSERR_INVALID) {
|
|
if (!mmu_emu_handle_fault(addr, 1, 0))
|
|
do_page_fault (&fp->ptregs, addr, 0);
|
|
} else {
|
|
pr_debug("protection fault on insn access (segv).\n");
|
|
force_sig (SIGSEGV);
|
|
}
|
|
}
|
|
#else
|
|
#if defined(CPU_M68020_OR_M68030)
|
|
static inline void bus_error030 (struct frame *fp)
|
|
{
|
|
volatile unsigned short temp;
|
|
unsigned short mmusr;
|
|
unsigned long addr, errorcode;
|
|
unsigned short ssw = fp->un.fmtb.ssw;
|
|
#ifdef DEBUG
|
|
unsigned long desc;
|
|
#endif
|
|
|
|
pr_debug("pid = %x ", current->pid);
|
|
pr_debug("SSW=%#06x ", ssw);
|
|
|
|
if (ssw & (FC | FB))
|
|
pr_debug("Instruction fault at %#010lx\n",
|
|
ssw & FC ?
|
|
fp->ptregs.format == 0xa ? fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2
|
|
:
|
|
fp->ptregs.format == 0xa ? fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
|
|
if (ssw & DF)
|
|
pr_debug("Data %s fault at %#010lx in %s (pc=%#lx)\n",
|
|
ssw & RW ? "read" : "write",
|
|
fp->un.fmtb.daddr,
|
|
space_names[ssw & DFC], fp->ptregs.pc);
|
|
|
|
/* ++andreas: If a data fault and an instruction fault happen
|
|
at the same time map in both pages. */
|
|
|
|
/* First handle the data fault, if any. */
|
|
if (ssw & DF) {
|
|
addr = fp->un.fmtb.daddr;
|
|
|
|
#ifdef DEBUG
|
|
asm volatile ("ptestr %3,%2@,#7,%0\n\t"
|
|
"pmove %%psr,%1"
|
|
: "=a&" (desc), "=m" (temp)
|
|
: "a" (addr), "d" (ssw));
|
|
pr_debug("mmusr is %#x for addr %#lx in task %p\n",
|
|
temp, addr, current);
|
|
pr_debug("descriptor address is 0x%p, contents %#lx\n",
|
|
__va(desc), *(unsigned long *)__va(desc));
|
|
#else
|
|
asm volatile ("ptestr %2,%1@,#7\n\t"
|
|
"pmove %%psr,%0"
|
|
: "=m" (temp) : "a" (addr), "d" (ssw));
|
|
#endif
|
|
mmusr = temp;
|
|
errorcode = (mmusr & MMU_I) ? 0 : 1;
|
|
if (!(ssw & RW) || (ssw & RM))
|
|
errorcode |= 2;
|
|
|
|
if (mmusr & (MMU_I | MMU_WP)) {
|
|
if (ssw & 4) {
|
|
pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
|
|
ssw & RW ? "read" : "write",
|
|
fp->un.fmtb.daddr,
|
|
space_names[ssw & DFC], fp->ptregs.pc);
|
|
goto buserr;
|
|
}
|
|
/* Don't try to do anything further if an exception was
|
|
handled. */
|
|
if (do_page_fault (&fp->ptregs, addr, errorcode) < 0)
|
|
return;
|
|
} else if (!(mmusr & MMU_I)) {
|
|
/* probably a 020 cas fault */
|
|
if (!(ssw & RM) && send_fault_sig(&fp->ptregs) > 0)
|
|
pr_err("unexpected bus error (%#x,%#x)\n", ssw,
|
|
mmusr);
|
|
} else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
|
|
pr_err("invalid %s access at %#lx from pc %#lx\n",
|
|
!(ssw & RW) ? "write" : "read", addr,
|
|
fp->ptregs.pc);
|
|
die_if_kernel("Oops",&fp->ptregs,mmusr);
|
|
force_sig(SIGSEGV);
|
|
return;
|
|
} else {
|
|
#if 0
|
|
static volatile long tlong;
|
|
#endif
|
|
|
|
pr_err("weird %s access at %#lx from pc %#lx (ssw is %#x)\n",
|
|
!(ssw & RW) ? "write" : "read", addr,
|
|
fp->ptregs.pc, ssw);
|
|
asm volatile ("ptestr #1,%1@,#0\n\t"
|
|
"pmove %%psr,%0"
|
|
: "=m" (temp)
|
|
: "a" (addr));
|
|
mmusr = temp;
|
|
|
|
pr_err("level 0 mmusr is %#x\n", mmusr);
|
|
#if 0
|
|
asm volatile ("pmove %%tt0,%0"
|
|
: "=m" (tlong));
|
|
pr_debug("tt0 is %#lx, ", tlong);
|
|
asm volatile ("pmove %%tt1,%0"
|
|
: "=m" (tlong));
|
|
pr_debug("tt1 is %#lx\n", tlong);
|
|
#endif
|
|
pr_debug("Unknown SIGSEGV - 1\n");
|
|
die_if_kernel("Oops",&fp->ptregs,mmusr);
|
|
force_sig(SIGSEGV);
|
|
return;
|
|
}
|
|
|
|
/* setup an ATC entry for the access about to be retried */
|
|
if (!(ssw & RW) || (ssw & RM))
|
|
asm volatile ("ploadw %1,%0@" : /* no outputs */
|
|
: "a" (addr), "d" (ssw));
|
|
else
|
|
asm volatile ("ploadr %1,%0@" : /* no outputs */
|
|
: "a" (addr), "d" (ssw));
|
|
}
|
|
|
|
/* Now handle the instruction fault. */
|
|
|
|
if (!(ssw & (FC|FB)))
|
|
return;
|
|
|
|
if (fp->ptregs.sr & PS_S) {
|
|
pr_err("Instruction fault at %#010lx\n", fp->ptregs.pc);
|
|
buserr:
|
|
pr_err("BAD KERNEL BUSERR\n");
|
|
die_if_kernel("Oops",&fp->ptregs,0);
|
|
force_sig(SIGKILL);
|
|
return;
|
|
}
|
|
|
|
/* get the fault address */
|
|
if (fp->ptregs.format == 10)
|
|
addr = fp->ptregs.pc + 4;
|
|
else
|
|
addr = fp->un.fmtb.baddr;
|
|
if (ssw & FC)
|
|
addr -= 2;
|
|
|
|
if ((ssw & DF) && ((addr ^ fp->un.fmtb.daddr) & PAGE_MASK) == 0)
|
|
/* Insn fault on same page as data fault. But we
|
|
should still create the ATC entry. */
|
|
goto create_atc_entry;
|
|
|
|
#ifdef DEBUG
|
|
asm volatile ("ptestr #1,%2@,#7,%0\n\t"
|
|
"pmove %%psr,%1"
|
|
: "=a&" (desc), "=m" (temp)
|
|
: "a" (addr));
|
|
pr_debug("mmusr is %#x for addr %#lx in task %p\n",
|
|
temp, addr, current);
|
|
pr_debug("descriptor address is 0x%p, contents %#lx\n",
|
|
__va(desc), *(unsigned long *)__va(desc));
|
|
#else
|
|
asm volatile ("ptestr #1,%1@,#7\n\t"
|
|
"pmove %%psr,%0"
|
|
: "=m" (temp) : "a" (addr));
|
|
#endif
|
|
mmusr = temp;
|
|
if (mmusr & MMU_I)
|
|
do_page_fault (&fp->ptregs, addr, 0);
|
|
else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
|
|
pr_err("invalid insn access at %#lx from pc %#lx\n",
|
|
addr, fp->ptregs.pc);
|
|
pr_debug("Unknown SIGSEGV - 2\n");
|
|
die_if_kernel("Oops",&fp->ptregs,mmusr);
|
|
force_sig(SIGSEGV);
|
|
return;
|
|
}
|
|
|
|
create_atc_entry:
|
|
/* setup an ATC entry for the access about to be retried */
|
|
asm volatile ("ploadr #2,%0@" : /* no outputs */
|
|
: "a" (addr));
|
|
}
|
|
#endif /* CPU_M68020_OR_M68030 */
|
|
#endif /* !CONFIG_SUN3 */
|
|
|
|
#if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU)
|
|
#include <asm/mcfmmu.h>
|
|
|
|
/*
|
|
* The following table converts the FS encoding of a ColdFire
|
|
* exception stack frame into the error_code value needed by
|
|
* do_fault.
|
|
*/
|
|
static const unsigned char fs_err_code[] = {
|
|
0, /* 0000 */
|
|
0, /* 0001 */
|
|
0, /* 0010 */
|
|
0, /* 0011 */
|
|
1, /* 0100 */
|
|
0, /* 0101 */
|
|
0, /* 0110 */
|
|
0, /* 0111 */
|
|
2, /* 1000 */
|
|
3, /* 1001 */
|
|
2, /* 1010 */
|
|
0, /* 1011 */
|
|
1, /* 1100 */
|
|
1, /* 1101 */
|
|
0, /* 1110 */
|
|
0 /* 1111 */
|
|
};
|
|
|
|
static inline void access_errorcf(unsigned int fs, struct frame *fp)
|
|
{
|
|
unsigned long mmusr, addr;
|
|
unsigned int err_code;
|
|
int need_page_fault;
|
|
|
|
mmusr = mmu_read(MMUSR);
|
|
addr = mmu_read(MMUAR);
|
|
|
|
/*
|
|
* error_code:
|
|
* bit 0 == 0 means no page found, 1 means protection fault
|
|
* bit 1 == 0 means read, 1 means write
|
|
*/
|
|
switch (fs) {
|
|
case 5: /* 0101 TLB opword X miss */
|
|
need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 0);
|
|
addr = fp->ptregs.pc;
|
|
break;
|
|
case 6: /* 0110 TLB extension word X miss */
|
|
need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 1);
|
|
addr = fp->ptregs.pc + sizeof(long);
|
|
break;
|
|
case 10: /* 1010 TLB W miss */
|
|
need_page_fault = cf_tlb_miss(&fp->ptregs, 1, 1, 0);
|
|
break;
|
|
case 14: /* 1110 TLB R miss */
|
|
need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 1, 0);
|
|
break;
|
|
default:
|
|
/* 0000 Normal */
|
|
/* 0001 Reserved */
|
|
/* 0010 Interrupt during debug service routine */
|
|
/* 0011 Reserved */
|
|
/* 0100 X Protection */
|
|
/* 0111 IFP in emulator mode */
|
|
/* 1000 W Protection*/
|
|
/* 1001 Write error*/
|
|
/* 1011 Reserved*/
|
|
/* 1100 R Protection*/
|
|
/* 1101 R Protection*/
|
|
/* 1111 OEP in emulator mode*/
|
|
need_page_fault = 1;
|
|
break;
|
|
}
|
|
|
|
if (need_page_fault) {
|
|
err_code = fs_err_code[fs];
|
|
if ((fs == 13) && (mmusr & MMUSR_WF)) /* rd-mod-wr access */
|
|
err_code |= 2; /* bit1 - write, bit0 - protection */
|
|
do_page_fault(&fp->ptregs, addr, err_code);
|
|
}
|
|
}
|
|
#endif /* CONFIG_COLDFIRE CONFIG_MMU */
|
|
|
|
asmlinkage void buserr_c(struct frame *fp)
|
|
{
|
|
/* Only set esp0 if coming from user mode */
|
|
if (user_mode(&fp->ptregs))
|
|
current->thread.esp0 = (unsigned long) fp;
|
|
|
|
pr_debug("*** Bus Error *** Format is %x\n", fp->ptregs.format);
|
|
|
|
#if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU)
|
|
if (CPU_IS_COLDFIRE) {
|
|
unsigned int fs;
|
|
fs = (fp->ptregs.vector & 0x3) |
|
|
((fp->ptregs.vector & 0xc00) >> 8);
|
|
switch (fs) {
|
|
case 0x5:
|
|
case 0x6:
|
|
case 0x7:
|
|
case 0x9:
|
|
case 0xa:
|
|
case 0xd:
|
|
case 0xe:
|
|
case 0xf:
|
|
access_errorcf(fs, fp);
|
|
return;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
#endif /* CONFIG_COLDFIRE && CONFIG_MMU */
|
|
|
|
switch (fp->ptregs.format) {
|
|
#if defined (CONFIG_M68060)
|
|
case 4: /* 68060 access error */
|
|
access_error060 (fp);
|
|
break;
|
|
#endif
|
|
#if defined (CONFIG_M68040)
|
|
case 0x7: /* 68040 access error */
|
|
access_error040 (fp);
|
|
break;
|
|
#endif
|
|
#if defined (CPU_M68020_OR_M68030)
|
|
case 0xa:
|
|
case 0xb:
|
|
bus_error030 (fp);
|
|
break;
|
|
#endif
|
|
default:
|
|
die_if_kernel("bad frame format",&fp->ptregs,0);
|
|
pr_debug("Unknown SIGSEGV - 4\n");
|
|
force_sig(SIGSEGV);
|
|
}
|
|
}
|
|
|
|
|
|
static int kstack_depth_to_print = 48;
|
|
|
|
static void show_trace(unsigned long *stack, const char *loglvl)
|
|
{
|
|
unsigned long *endstack;
|
|
unsigned long addr;
|
|
int i;
|
|
|
|
printk("%sCall Trace:", loglvl);
|
|
addr = (unsigned long)stack + THREAD_SIZE - 1;
|
|
endstack = (unsigned long *)(addr & -THREAD_SIZE);
|
|
i = 0;
|
|
while (stack + 1 <= endstack) {
|
|
addr = *stack++;
|
|
/*
|
|
* If the address is either in the text segment of the
|
|
* kernel, or in the region which contains vmalloc'ed
|
|
* memory, it *may* be the address of a calling
|
|
* routine; if so, print it so that someone tracing
|
|
* down the cause of the crash will be able to figure
|
|
* out the call path that was taken.
|
|
*/
|
|
if (__kernel_text_address(addr)) {
|
|
#ifndef CONFIG_KALLSYMS
|
|
if (i % 5 == 0)
|
|
pr_cont("\n ");
|
|
#endif
|
|
pr_cont(" [<%08lx>] %pS\n", addr, (void *)addr);
|
|
i++;
|
|
}
|
|
}
|
|
pr_cont("\n");
|
|
}
|
|
|
|
void show_registers(struct pt_regs *regs)
|
|
{
|
|
struct frame *fp = (struct frame *)regs;
|
|
u16 c, *cp;
|
|
unsigned long addr;
|
|
int i;
|
|
|
|
print_modules();
|
|
pr_info("PC: [<%08lx>] %pS\n", regs->pc, (void *)regs->pc);
|
|
pr_info("SR: %04x SP: %p a2: %08lx\n", regs->sr, regs, regs->a2);
|
|
pr_info("d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
|
|
regs->d0, regs->d1, regs->d2, regs->d3);
|
|
pr_info("d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
|
|
regs->d4, regs->d5, regs->a0, regs->a1);
|
|
|
|
pr_info("Process %s (pid: %d, task=%p)\n",
|
|
current->comm, task_pid_nr(current), current);
|
|
addr = (unsigned long)&fp->un;
|
|
pr_info("Frame format=%X ", regs->format);
|
|
switch (regs->format) {
|
|
case 0x2:
|
|
pr_cont("instr addr=%08lx\n", fp->un.fmt2.iaddr);
|
|
addr += sizeof(fp->un.fmt2);
|
|
break;
|
|
case 0x3:
|
|
pr_cont("eff addr=%08lx\n", fp->un.fmt3.effaddr);
|
|
addr += sizeof(fp->un.fmt3);
|
|
break;
|
|
case 0x4:
|
|
if (CPU_IS_060)
|
|
pr_cont("fault addr=%08lx fslw=%08lx\n",
|
|
fp->un.fmt4.effaddr, fp->un.fmt4.pc);
|
|
else
|
|
pr_cont("eff addr=%08lx pc=%08lx\n",
|
|
fp->un.fmt4.effaddr, fp->un.fmt4.pc);
|
|
addr += sizeof(fp->un.fmt4);
|
|
break;
|
|
case 0x7:
|
|
pr_cont("eff addr=%08lx ssw=%04x faddr=%08lx\n",
|
|
fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
|
|
pr_info("wb 1 stat/addr/data: %04x %08lx %08lx\n",
|
|
fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
|
|
pr_info("wb 2 stat/addr/data: %04x %08lx %08lx\n",
|
|
fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
|
|
pr_info("wb 3 stat/addr/data: %04x %08lx %08lx\n",
|
|
fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
|
|
pr_info("push data: %08lx %08lx %08lx %08lx\n",
|
|
fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
|
|
fp->un.fmt7.pd3);
|
|
addr += sizeof(fp->un.fmt7);
|
|
break;
|
|
case 0x9:
|
|
pr_cont("instr addr=%08lx\n", fp->un.fmt9.iaddr);
|
|
addr += sizeof(fp->un.fmt9);
|
|
break;
|
|
case 0xa:
|
|
pr_cont("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
|
|
fp->un.fmta.ssw, fp->un.fmta.isc, fp->un.fmta.isb,
|
|
fp->un.fmta.daddr, fp->un.fmta.dobuf);
|
|
addr += sizeof(fp->un.fmta);
|
|
break;
|
|
case 0xb:
|
|
pr_cont("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lx\n",
|
|
fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
|
|
fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
|
|
pr_info("baddr=%08lx dibuf=%08lx ver=%x\n",
|
|
fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
|
|
addr += sizeof(fp->un.fmtb);
|
|
break;
|
|
default:
|
|
pr_cont("\n");
|
|
}
|
|
show_stack(NULL, (unsigned long *)addr, KERN_INFO);
|
|
|
|
pr_info("Code:");
|
|
cp = (u16 *)regs->pc;
|
|
for (i = -8; i < 16; i++) {
|
|
if (get_kernel_nofault(c, cp + i) && i >= 0) {
|
|
pr_cont(" Bad PC value.");
|
|
break;
|
|
}
|
|
if (i)
|
|
pr_cont(" %04x", c);
|
|
else
|
|
pr_cont(" <%04x>", c);
|
|
}
|
|
pr_cont("\n");
|
|
}
|
|
|
|
void show_stack(struct task_struct *task, unsigned long *stack,
|
|
const char *loglvl)
|
|
{
|
|
unsigned long *p;
|
|
unsigned long *endstack;
|
|
int i;
|
|
|
|
if (!stack) {
|
|
if (task)
|
|
stack = (unsigned long *)task->thread.esp0;
|
|
else
|
|
stack = (unsigned long *)&stack;
|
|
}
|
|
endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
|
|
|
|
printk("%sStack from %08lx:", loglvl, (unsigned long)stack);
|
|
p = stack;
|
|
for (i = 0; i < kstack_depth_to_print; i++) {
|
|
if (p + 1 > endstack)
|
|
break;
|
|
if (i % 8 == 0)
|
|
pr_cont("\n ");
|
|
pr_cont(" %08lx", *p++);
|
|
}
|
|
pr_cont("\n");
|
|
show_trace(stack, loglvl);
|
|
}
|
|
|
|
/*
|
|
* The vector number returned in the frame pointer may also contain
|
|
* the "fs" (Fault Status) bits on ColdFire. These are in the bottom
|
|
* 2 bits, and upper 2 bits. So we need to mask out the real vector
|
|
* number before using it in comparisons. You don't need to do this on
|
|
* real 68k parts, but it won't hurt either.
|
|
*/
|
|
|
|
void bad_super_trap (struct frame *fp)
|
|
{
|
|
int vector = (fp->ptregs.vector >> 2) & 0xff;
|
|
|
|
console_verbose();
|
|
if (vector < ARRAY_SIZE(vec_names))
|
|
pr_err("*** %s *** FORMAT=%X\n",
|
|
vec_names[vector],
|
|
fp->ptregs.format);
|
|
else
|
|
pr_err("*** Exception %d *** FORMAT=%X\n",
|
|
vector, fp->ptregs.format);
|
|
if (vector == VEC_ADDRERR && CPU_IS_020_OR_030) {
|
|
unsigned short ssw = fp->un.fmtb.ssw;
|
|
|
|
pr_err("SSW=%#06x ", ssw);
|
|
|
|
if (ssw & RC)
|
|
pr_err("Pipe stage C instruction fault at %#010lx\n",
|
|
(fp->ptregs.format) == 0xA ?
|
|
fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
|
|
if (ssw & RB)
|
|
pr_err("Pipe stage B instruction fault at %#010lx\n",
|
|
(fp->ptregs.format) == 0xA ?
|
|
fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
|
|
if (ssw & DF)
|
|
pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
|
|
ssw & RW ? "read" : "write",
|
|
fp->un.fmtb.daddr, space_names[ssw & DFC],
|
|
fp->ptregs.pc);
|
|
}
|
|
pr_err("Current process id is %d\n", task_pid_nr(current));
|
|
die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
|
|
}
|
|
|
|
asmlinkage void trap_c(struct frame *fp)
|
|
{
|
|
int sig, si_code;
|
|
void __user *addr;
|
|
int vector = (fp->ptregs.vector >> 2) & 0xff;
|
|
|
|
if (fp->ptregs.sr & PS_S) {
|
|
if (vector == VEC_TRACE) {
|
|
/* traced a trapping instruction on a 68020/30,
|
|
* real exception will be executed afterwards.
|
|
*/
|
|
return;
|
|
}
|
|
#ifdef CONFIG_MMU
|
|
if (fixup_exception(&fp->ptregs))
|
|
return;
|
|
#endif
|
|
bad_super_trap(fp);
|
|
return;
|
|
}
|
|
|
|
/* send the appropriate signal to the user program */
|
|
switch (vector) {
|
|
case VEC_ADDRERR:
|
|
si_code = BUS_ADRALN;
|
|
sig = SIGBUS;
|
|
break;
|
|
case VEC_ILLEGAL:
|
|
case VEC_LINE10:
|
|
case VEC_LINE11:
|
|
si_code = ILL_ILLOPC;
|
|
sig = SIGILL;
|
|
break;
|
|
case VEC_PRIV:
|
|
si_code = ILL_PRVOPC;
|
|
sig = SIGILL;
|
|
break;
|
|
case VEC_COPROC:
|
|
si_code = ILL_COPROC;
|
|
sig = SIGILL;
|
|
break;
|
|
case VEC_TRAP1:
|
|
case VEC_TRAP2:
|
|
case VEC_TRAP3:
|
|
case VEC_TRAP4:
|
|
case VEC_TRAP5:
|
|
case VEC_TRAP6:
|
|
case VEC_TRAP7:
|
|
case VEC_TRAP8:
|
|
case VEC_TRAP9:
|
|
case VEC_TRAP10:
|
|
case VEC_TRAP11:
|
|
case VEC_TRAP12:
|
|
case VEC_TRAP13:
|
|
case VEC_TRAP14:
|
|
si_code = ILL_ILLTRP;
|
|
sig = SIGILL;
|
|
break;
|
|
case VEC_FPBRUC:
|
|
case VEC_FPOE:
|
|
case VEC_FPNAN:
|
|
si_code = FPE_FLTINV;
|
|
sig = SIGFPE;
|
|
break;
|
|
case VEC_FPIR:
|
|
si_code = FPE_FLTRES;
|
|
sig = SIGFPE;
|
|
break;
|
|
case VEC_FPDIVZ:
|
|
si_code = FPE_FLTDIV;
|
|
sig = SIGFPE;
|
|
break;
|
|
case VEC_FPUNDER:
|
|
si_code = FPE_FLTUND;
|
|
sig = SIGFPE;
|
|
break;
|
|
case VEC_FPOVER:
|
|
si_code = FPE_FLTOVF;
|
|
sig = SIGFPE;
|
|
break;
|
|
case VEC_ZERODIV:
|
|
si_code = FPE_INTDIV;
|
|
sig = SIGFPE;
|
|
break;
|
|
case VEC_CHK:
|
|
case VEC_TRAP:
|
|
si_code = FPE_INTOVF;
|
|
sig = SIGFPE;
|
|
break;
|
|
case VEC_TRACE: /* ptrace single step */
|
|
si_code = TRAP_TRACE;
|
|
sig = SIGTRAP;
|
|
break;
|
|
case VEC_TRAP15: /* breakpoint */
|
|
si_code = TRAP_BRKPT;
|
|
sig = SIGTRAP;
|
|
break;
|
|
default:
|
|
si_code = ILL_ILLOPC;
|
|
sig = SIGILL;
|
|
break;
|
|
}
|
|
switch (fp->ptregs.format) {
|
|
default:
|
|
addr = (void __user *) fp->ptregs.pc;
|
|
break;
|
|
case 2:
|
|
addr = (void __user *) fp->un.fmt2.iaddr;
|
|
break;
|
|
case 7:
|
|
addr = (void __user *) fp->un.fmt7.effaddr;
|
|
break;
|
|
case 9:
|
|
addr = (void __user *) fp->un.fmt9.iaddr;
|
|
break;
|
|
case 10:
|
|
addr = (void __user *) fp->un.fmta.daddr;
|
|
break;
|
|
case 11:
|
|
addr = (void __user*) fp->un.fmtb.daddr;
|
|
break;
|
|
}
|
|
force_sig_fault(sig, si_code, addr);
|
|
}
|
|
|
|
void die_if_kernel (char *str, struct pt_regs *fp, int nr)
|
|
{
|
|
if (!(fp->sr & PS_S))
|
|
return;
|
|
|
|
console_verbose();
|
|
pr_crit("%s: %08x\n", str, nr);
|
|
show_registers(fp);
|
|
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
|
|
make_task_dead(SIGSEGV);
|
|
}
|
|
|
|
asmlinkage void set_esp0(unsigned long ssp)
|
|
{
|
|
current->thread.esp0 = ssp;
|
|
}
|
|
|
|
/*
|
|
* This function is called if an error occur while accessing
|
|
* user-space from the fpsp040 code.
|
|
*/
|
|
asmlinkage void fpsp040_die(void)
|
|
{
|
|
force_exit_sig(SIGSEGV);
|
|
}
|
|
|
|
#ifdef CONFIG_M68KFPU_EMU
|
|
asmlinkage void fpemu_signal(int signal, int code, void *addr)
|
|
{
|
|
force_sig_fault(signal, code, addr);
|
|
}
|
|
#endif
|