traps.c
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上传日期:2013-04-10
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- /*
- * linux/arch/m68k/kernel/traps.c
- *
- * Copyright (C) 1993, 1994 by Hamish Macdonald
- *
- * 68040 fixes by Michael Rausch
- * 68040 fixes by Martin Apel
- * 68040 fixes and writeback by Richard Zidlicky
- * 68060 fixes by Roman Hodek
- * 68060 fixes by Jesper Skov
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file COPYING in the main directory of this archive
- * for more details.
- */
- /*
- * Sets up all exception vectors
- */
- #include <linux/config.h>
- #include <linux/sched.h>
- #include <linux/signal.h>
- #include <linux/kernel.h>
- #include <linux/mm.h>
- #include <linux/module.h>
- #include <linux/a.out.h>
- #include <linux/user.h>
- #include <linux/string.h>
- #include <linux/linkage.h>
- #include <linux/init.h>
- #include <asm/setup.h>
- #include <asm/fpu.h>
- #include <asm/system.h>
- #include <asm/uaccess.h>
- #include <asm/traps.h>
- #include <asm/pgalloc.h>
- #include <asm/machdep.h>
- #include <asm/siginfo.h>
- /* assembler routines */
- asmlinkage void system_call(void);
- asmlinkage void buserr(void);
- asmlinkage void trap(void);
- asmlinkage void inthandler(void);
- asmlinkage void nmihandler(void);
- #ifdef CONFIG_M68KFPU_EMU
- asmlinkage void fpu_emu(void);
- #endif
- e_vector vectors[256] = {
- 0, 0, buserr, trap, trap, trap, trap, trap,
- trap, trap, trap, trap, trap, trap, trap, trap,
- trap, trap, trap, trap, trap, trap, trap, trap,
- inthandler, inthandler, inthandler, inthandler,
- inthandler, inthandler, inthandler, inthandler,
- /* TRAP #0-15 */
- system_call, trap, trap, trap, trap, trap, trap, trap,
- trap, trap, trap, trap, trap, trap, trap, trap,
- 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
- };
- /* nmi handler for the Amiga */
- asm(".textn"
- __ALIGN_STR "n"
- SYMBOL_NAME_STR(nmihandler) ": rte");
- /*
- * this must be called very early as the kernel might
- * use some instruction that are emulated on the 060
- */
- void __init base_trap_init(void)
- {
- if(MACH_IS_SUN3X) {
- extern e_vector *sun3x_prom_vbr;
- __asm__ volatile ("movec %%vbr, %0" : "=r" ((void*)sun3x_prom_vbr));
- }
-
- /* setup the exception vector table */
- __asm__ volatile ("movec %0,%%vbr" : : "r" ((void*)vectors));
- if (CPU_IS_060) {
- /* set up ISP entry points */
- asmlinkage void unimp_vec(void) asm ("_060_isp_unimp");
- vectors[VEC_UNIMPII] = unimp_vec;
- }
- }
- void __init trap_init (void)
- {
- int i;
- for (i = 48; i < 64; i++)
- if (!vectors[i])
- vectors[i] = trap;
- for (i = 64; i < 256; i++)
- vectors[i] = inthandler;
- #ifdef CONFIG_M68KFPU_EMU
- if (FPU_IS_EMU)
- vectors[VEC_LINE11] = fpu_emu;
- #endif
- if (CPU_IS_040 && !FPU_IS_EMU) {
- /* set up FPSP entry points */
- asmlinkage void dz_vec(void) asm ("dz");
- asmlinkage void inex_vec(void) asm ("inex");
- asmlinkage void ovfl_vec(void) asm ("ovfl");
- asmlinkage void unfl_vec(void) asm ("unfl");
- asmlinkage void snan_vec(void) asm ("snan");
- asmlinkage void operr_vec(void) asm ("operr");
- asmlinkage void bsun_vec(void) asm ("bsun");
- asmlinkage void fline_vec(void) asm ("fline");
- asmlinkage void unsupp_vec(void) asm ("unsupp");
- vectors[VEC_FPDIVZ] = dz_vec;
- vectors[VEC_FPIR] = inex_vec;
- vectors[VEC_FPOVER] = ovfl_vec;
- vectors[VEC_FPUNDER] = unfl_vec;
- vectors[VEC_FPNAN] = snan_vec;
- vectors[VEC_FPOE] = operr_vec;
- vectors[VEC_FPBRUC] = bsun_vec;
- vectors[VEC_LINE11] = fline_vec;
- vectors[VEC_FPUNSUP] = unsupp_vec;
- }
- if (CPU_IS_060 && !FPU_IS_EMU) {
- /* set up IFPSP entry points */
- asmlinkage void snan_vec(void) asm ("_060_fpsp_snan");
- asmlinkage void operr_vec(void) asm ("_060_fpsp_operr");
- asmlinkage void ovfl_vec(void) asm ("_060_fpsp_ovfl");
- asmlinkage void unfl_vec(void) asm ("_060_fpsp_unfl");
- asmlinkage void dz_vec(void) asm ("_060_fpsp_dz");
- asmlinkage void inex_vec(void) asm ("_060_fpsp_inex");
- asmlinkage void fline_vec(void) asm ("_060_fpsp_fline");
- asmlinkage void unsupp_vec(void) asm ("_060_fpsp_unsupp");
- asmlinkage void effadd_vec(void) asm ("_060_fpsp_effadd");
- vectors[VEC_FPNAN] = snan_vec;
- vectors[VEC_FPOE] = operr_vec;
- vectors[VEC_FPOVER] = ovfl_vec;
- vectors[VEC_FPUNDER] = unfl_vec;
- vectors[VEC_FPDIVZ] = dz_vec;
- vectors[VEC_FPIR] = inex_vec;
- vectors[VEC_LINE11] = fline_vec;
- vectors[VEC_FPUNSUP] = unsupp_vec;
- vectors[VEC_UNIMPEA] = effadd_vec;
- }
- /* if running on an amiga, make the NMI interrupt do nothing */
- if (MACH_IS_AMIGA) {
- vectors[VEC_INT7] = nmihandler;
- }
- }
- static char *vec_names[] = {
- "RESET SP", "RESET PC", "BUS ERROR", "ADDRESS ERROR",
- "ILLEGAL INSTRUCTION", "ZERO DIVIDE", "CHK", "TRAPcc",
- "PRIVILEGE VIOLATION", "TRACE", "LINE 1010", "LINE 1111",
- "UNASSIGNED RESERVED 12", "COPROCESSOR PROTOCOL VIOLATION",
- "FORMAT ERROR", "UNINITIALIZED INTERRUPT",
- "UNASSIGNED RESERVED 16", "UNASSIGNED RESERVED 17",
- "UNASSIGNED RESERVED 18", "UNASSIGNED RESERVED 19",
- "UNASSIGNED RESERVED 20", "UNASSIGNED RESERVED 21",
- "UNASSIGNED RESERVED 22", "UNASSIGNED RESERVED 23",
- "SPURIOUS INTERRUPT", "LEVEL 1 INT", "LEVEL 2 INT", "LEVEL 3 INT",
- "LEVEL 4 INT", "LEVEL 5 INT", "LEVEL 6 INT", "LEVEL 7 INT",
- "SYSCALL", "TRAP #1", "TRAP #2", "TRAP #3",
- "TRAP #4", "TRAP #5", "TRAP #6", "TRAP #7",
- "TRAP #8", "TRAP #9", "TRAP #10", "TRAP #11",
- "TRAP #12", "TRAP #13", "TRAP #14", "TRAP #15",
- "FPCP BSUN", "FPCP INEXACT", "FPCP DIV BY 0", "FPCP UNDERFLOW",
- "FPCP OPERAND ERROR", "FPCP OVERFLOW", "FPCP SNAN",
- "FPCP UNSUPPORTED OPERATION",
- "MMU CONFIGURATION ERROR"
- };
- #ifndef CONFIG_SUN3
- static char *space_names[] = {
- "Space 0", "User Data", "User Program", "Space 3",
- "Space 4", "Super Data", "Super Program", "CPU"
- };
- #else
- static char *space_names[] = {
- "Space 0", "User Data", "User Program", "Control",
- "Space 4", "Super Data", "Super Program", "CPU"
- };
- #endif
- void die_if_kernel(char *,struct pt_regs *,int);
- asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
- unsigned long error_code);
- int send_fault_sig(struct pt_regs *regs);
- asmlinkage void trap_c(struct frame *fp);
- #if defined (CONFIG_M68060)
- static inline void access_error060 (struct frame *fp)
- {
- unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */
- #ifdef DEBUG
- printk("fslw=%#lx, fa=%#lxn", fslw, fp->un.fmt4.effaddr);
- #endif
- if (fslw & MMU060_BPE) {
- /* branch prediction error -> clear branch cache */
- __asm__ __volatile__ ("movec %/cacr,%/d0nt"
- "orl #0x00400000,%/d0nt"
- "movec %/d0,%/cacr"
- : : : "d0" );
- /* return if there's no other error */
- if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
- return;
- }
- if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
- unsigned long errorcode;
- unsigned long addr = fp->un.fmt4.effaddr;
- if (fslw & MMU060_MA)
- addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;
- errorcode = 1;
- if (fslw & MMU060_DESC_ERR) {
- __flush_tlb040_one(addr);
- errorcode = 0;
- }
- if (fslw & MMU060_W)
- errorcode |= 2;
- #ifdef DEBUG
- printk("errorcode = %dn", errorcode );
- #endif
- do_page_fault(&fp->ptregs, addr, errorcode);
- } else if (fslw & (MMU060_SEE)){
- /* Software Emulation Error.
- * fault during mem_read/mem_write in ifpsp060/os.S
- */
- send_fault_sig(&fp->ptregs);
- } else {
- printk("pc=%#lx, fa=%#lxn", fp->ptregs.pc, fp->un.fmt4.effaddr);
- printk( "68060 access error, fslw=%lxn", fslw );
- trap_c( fp );
- }
- }
- #endif /* CONFIG_M68060 */
- #if defined (CONFIG_M68040)
- static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
- {
- unsigned long mmusr;
- mm_segment_t old_fs = get_fs();
- set_fs(MAKE_MM_SEG(wbs));
- if (iswrite)
- asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
- else
- asm volatile (".chip 68040; ptestr (%0); .chip 68k" : : "a" (addr));
- asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
- set_fs(old_fs);
- return mmusr;
- }
- static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
- unsigned long wbd)
- {
- int res = 0;
- mm_segment_t old_fs = get_fs();
- /* set_fs can not be moved, otherwise put_user() may oops */
- set_fs(MAKE_MM_SEG(wbs));
- switch (wbs & WBSIZ_040) {
- case BA_SIZE_BYTE:
- res = put_user(wbd & 0xff, (char *)wba);
- break;
- case BA_SIZE_WORD:
- res = put_user(wbd & 0xffff, (short *)wba);
- break;
- case BA_SIZE_LONG:
- res = put_user(wbd, (int *)wba);
- break;
- }
- /* set_fs can not be moved, otherwise put_user() may oops */
- set_fs(old_fs);
-
- #ifdef DEBUG
- printk("do_040writeback1, res=%dn",res);
- #endif
- return res;
- }
- /* after an exception in a writeback the stack frame coresponding
- * to that exception is discarded, set a few bits in the old frame
- * to simulate what it should look like
- */
- static inline void fix_xframe040(struct frame *fp, unsigned long wba, unsigned short wbs)
- {
- fp->un.fmt7.faddr = wba;
- fp->un.fmt7.ssw = wbs & 0xff;
- if (wba != current->thread.faddr)
- fp->un.fmt7.ssw |= MA_040;
- }
- static inline void do_040writebacks(struct frame *fp)
- {
- int res = 0;
- #if 0
- if (fp->un.fmt7.wb1s & WBV_040)
- printk("access_error040: cannot handle 1st writeback. oops.n");
- #endif
- if ((fp->un.fmt7.wb2s & WBV_040) &&
- !(fp->un.fmt7.wb2s & WBTT_040)) {
- res = do_040writeback1(fp->un.fmt7.wb2s, fp->un.fmt7.wb2a,
- fp->un.fmt7.wb2d);
- if (res)
- fix_xframe040(fp, fp->un.fmt7.wb2a, fp->un.fmt7.wb2s);
- else
- fp->un.fmt7.wb2s = 0;
- }
- /* do the 2nd wb only if the first one was succesful (except for a kernel wb) */
- if (fp->un.fmt7.wb3s & WBV_040 && (!res || fp->un.fmt7.wb3s & 4)) {
- res = do_040writeback1(fp->un.fmt7.wb3s, fp->un.fmt7.wb3a,
- fp->un.fmt7.wb3d);
- if (res)
- {
- fix_xframe040(fp, fp->un.fmt7.wb3a, fp->un.fmt7.wb3s);
- fp->un.fmt7.wb2s = fp->un.fmt7.wb3s;
- fp->un.fmt7.wb3s &= (~WBV_040);
- fp->un.fmt7.wb2a = fp->un.fmt7.wb3a;
- fp->un.fmt7.wb2d = fp->un.fmt7.wb3d;
- }
- else
- fp->un.fmt7.wb3s = 0;
- }
- if (res)
- send_fault_sig(&fp->ptregs);
- }
- /*
- * called from sigreturn(), must ensure userspace code didn't
- * manipulate exception frame to circumvent protection, then complete
- * pending writebacks
- * we just clear TM2 to turn it into an userspace access
- */
- asmlinkage void berr_040cleanup(struct frame *fp)
- {
- fp->un.fmt7.wb2s &= ~4;
- fp->un.fmt7.wb3s &= ~4;
- do_040writebacks(fp);
- }
- static inline void access_error040(struct frame *fp)
- {
- unsigned short ssw = fp->un.fmt7.ssw;
- unsigned long mmusr;
- #ifdef DEBUG
- printk("ssw=%#x, fa=%#lxn", ssw, fp->un.fmt7.faddr);
- printk("wb1s=%#x, wb2s=%#x, wb3s=%#xn", fp->un.fmt7.wb1s,
- fp->un.fmt7.wb2s, fp->un.fmt7.wb3s);
- printk ("wb2a=%lx, wb3a=%lx, wb2d=%lx, wb3d=%lxn",
- fp->un.fmt7.wb2a, fp->un.fmt7.wb3a,
- fp->un.fmt7.wb2d, fp->un.fmt7.wb3d);
- #endif
- if (ssw & ATC_040) {
- unsigned long addr = fp->un.fmt7.faddr;
- unsigned long errorcode;
- /*
- * The MMU status has to be determined AFTER the address
- * has been corrected if there was a misaligned access (MA).
- */
- if (ssw & MA_040)
- addr = (addr + 7) & -8;
- /* MMU error, get the MMUSR info for this access */
- mmusr = probe040(!(ssw & RW_040), addr, ssw);
- #ifdef DEBUG
- printk("mmusr = %lxn", mmusr);
- #endif
- errorcode = 1;
- if (!(mmusr & MMU_R_040)) {
- /* clear the invalid atc entry */
- __flush_tlb040_one(addr);
- errorcode = 0;
- }
- /* despite what documentation seems to say, RMW
- * accesses have always both the LK and RW bits set */
- if (!(ssw & RW_040) || (ssw & LK_040))
- errorcode |= 2;
- if (do_page_fault(&fp->ptregs, addr, errorcode)) {
- #ifdef DEBUG
- printk("do_page_fault() !=0 n");
- #endif
- if (user_mode(&fp->ptregs)){
- /* delay writebacks after signal delivery */
- #ifdef DEBUG
- printk(".. was usermode - returnn");
- #endif
- return;
- }
- /* disable writeback into user space from kernel
- * (if do_page_fault didn't fix the mapping,
- * the writeback won't do good)
- */
- #ifdef DEBUG
- printk(".. disabling wb2n");
- #endif
- if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
- fp->un.fmt7.wb2s &= ~WBV_040;
- }
- } else {
- printk("68040 access error, ssw=%xn", ssw);
- trap_c(fp);
- }
- do_040writebacks(fp);
- }
- #endif /* CONFIG_M68040 */
- #if defined(CONFIG_SUN3)
- #include <asm/sun3mmu.h>
- extern int mmu_emu_handle_fault (unsigned long, int, int);
- /* sun3 version of bus_error030 */
- extern 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;
- #if DEBUG
- if (ssw & (FC | FB))
- printk ("Instruction fault at %#010lxn",
- 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)
- printk ("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);
- #endif
- /*
- * 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))
- printk ("Instruction fault at %#010lxn",
- fp->ptregs.pc);
- if (ssw & DF) {
- printk ("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);
- }
- printk ("BAD KERNEL BUSERRn");
- die_if_kernel("Oops", &fp->ptregs,0);
- force_sig(SIGKILL, current);
- 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 {
- #ifdef DEBUG
- printk ("*** unexpected busfault type=%#04xn", buserr_type);
- printk ("invalid %s access at %#lx from pc %#lxn",
- !(ssw & RW) ? "write" : "read", addr,
- fp->ptregs.pc);
- #endif
- die_if_kernel ("Oops", &fp->ptregs, buserr_type);
- force_sig (SIGBUS, current);
- 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 (fp->un.fmtb.daddr, 1, 0))
- do_page_fault (&fp->ptregs, addr, 0);
- } else {
- #ifdef DEBUG
- printk ("protection fault on insn access (segv).n");
- #endif
- force_sig (SIGSEGV, current);
- }
- }
- #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;
- int user_space_fault = 1;
- #if DEBUG
- unsigned long desc;
- #endif
- #if DEBUG
- printk ("pid = %x ", current->pid);
- printk ("SSW=%#06x ", ssw);
- if (ssw & (FC | FB))
- printk ("Instruction fault at %#010lxn",
- 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)
- printk ("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);
- #endif
- if (fp->ptregs.sr & PS_S) {
- /* kernel fault must be a data fault to user space */
- if (! ((ssw & DF) && ((ssw & DFC) == USER_DATA))) {
- /* instruction fault or kernel data fault! */
- if (ssw & (FC | FB))
- printk ("Instruction fault at %#010lxn",
- fp->ptregs.pc);
- if (ssw & DF) {
- printk ("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);
- }
- printk ("BAD KERNEL BUSERRn");
- die_if_kernel("Oops",&fp->ptregs,0);
- force_sig(SIGKILL, current);
- 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");
- user_space_fault = 1;
- #if DEBUG
- printk("User space bus-errorn");
- #endif
- }
- /* ++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;
- mmusr = MMU_I;
- if (user_space_fault) {
- #if DEBUG
- asm volatile ("ptestr #1,%2@,#7,%0nt"
- "pmove %/psr,%1@"
- : "=a&" (desc)
- : "a" (&temp), "a" (addr));
- #else
- asm volatile ("ptestr #1,%1@,#7nt"
- "pmove %/psr,%0@"
- : : "a" (&temp), "a" (addr));
- #endif
- mmusr = temp;
- }
-
- #if DEBUG
- printk ("mmusr is %#x for addr %#lx in task %pn",
- mmusr, addr, current);
- printk ("descriptor address is %#lx, contents %#lxn",
- __va(desc), *(unsigned long *)__va(desc));
- #endif
- errorcode = (mmusr & MMU_I) ? 0 : 1;
- if (!(ssw & RW) || (ssw & RM))
- errorcode |= 2;
- if (mmusr & (MMU_I | MMU_WP)) {
- /* 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_B|MMU_L|MMU_S)) {
- printk ("invalid %s access at %#lx from pc %#lxn",
- !(ssw & RW) ? "write" : "read", addr,
- fp->ptregs.pc);
- die_if_kernel("Oops",&fp->ptregs,mmusr);
- force_sig(SIGSEGV, current);
- return;
- } else {
- #if 0
- static volatile long tlong;
- #endif
- printk ("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@,#0nt"
- "pmove %/psr,%0@"
- : /* no outputs */
- : "a" (&temp), "a" (addr));
- mmusr = temp;
- printk ("level 0 mmusr is %#xn", mmusr);
- #if 0
- asm volatile ("pmove %/tt0,%0@"
- : /* no outputs */
- : "a" (&tlong));
- printk ("tt0 is %#lx, ", tlong);
- asm volatile ("pmove %/tt1,%0@"
- : /* no outputs */
- : "a" (&tlong));
- printk ("tt1 is %#lxn", tlong);
- #endif
- #if DEBUG
- printk("Unknown SIGSEGV - 1n");
- #endif
- die_if_kernel("Oops",&fp->ptregs,mmusr);
- force_sig(SIGSEGV, current);
- return;
- }
- /* setup an ATC entry for the access about to be retried */
- if (!(ssw & RW))
- 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;
- /* 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;
- mmusr = MMU_I;
- if (user_space_fault) {
- #if DEBUG
- asm volatile ("ptestr #1,%2@,#7,%0nt"
- "pmove %/psr,%1@"
- : "=a&" (desc)
- : "a" (&temp), "a" (addr));
- #else
- asm volatile ("ptestr #1,%1@,#7nt"
- "pmove %/psr,%0@"
- : : "a" (&temp), "a" (addr));
- #endif
- mmusr = temp;
- }
-
- #ifdef DEBUG
- printk ("mmusr is %#x for addr %#lx in task %pn",
- mmusr, addr, current);
- printk ("descriptor address is %#lx, contents %#lxn",
- __va(desc), *(unsigned long *)__va(desc));
- #endif
- if (mmusr & MMU_I)
- do_page_fault (&fp->ptregs, addr, 0);
- else if (mmusr & (MMU_B|MMU_L|MMU_S)) {
- printk ("invalid insn access at %#lx from pc %#lxn",
- addr, fp->ptregs.pc);
- #if DEBUG
- printk("Unknown SIGSEGV - 2n");
- #endif
- die_if_kernel("Oops",&fp->ptregs,mmusr);
- force_sig(SIGSEGV, current);
- 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 */
- 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;
- #if DEBUG
- printk ("*** Bus Error *** Format is %xn", fp->ptregs.format);
- #endif
- 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);
- #if DEBUG
- printk("Unknown SIGSEGV - 4n");
- #endif
- force_sig(SIGSEGV, current);
- }
- }
- int kstack_depth_to_print = 48;
- extern struct module kernel_module;
- static inline int kernel_text_address(unsigned long addr)
- {
- #ifdef CONFIG_MODULES
- struct module *mod;
- #endif
- extern char _stext, _etext;
- if (addr >= (unsigned long) &_stext &&
- addr <= (unsigned long) &_etext)
- return 1;
- #ifdef CONFIG_MODULES
- for (mod = module_list; mod != &kernel_module; mod = mod->next) {
- /* mod_bound tests for addr being inside the vmalloc'ed
- * module area. Of course it'd be better to test only
- * for the .text subset... */
- if (mod_bound(addr, 0, mod))
- return 1;
- }
- #endif
- return 0;
- }
- void show_trace(unsigned long *stack)
- {
- unsigned long *endstack;
- unsigned long addr;
- int i;
- printk("Call Trace:");
- 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)) {
- if (i % 4 == 0)
- printk("n ");
- printk(" [<%08lx>]", addr);
- i++;
- }
- }
- printk("n");
- }
- void show_trace_task(struct task_struct *tsk)
- {
- show_trace((unsigned long *)tsk->thread.esp0);
- }
- static void show_stack(struct frame *fp)
- {
- unsigned long *stack, *endstack, addr;
- int i;
- if (fp == NULL)
- fp = (struct frame *)&fp;
- addr = (unsigned long)&fp->un;
- printk("Frame format=%X ", fp->ptregs.format);
- switch (fp->ptregs.format) {
- case 0x2:
- printk("instr addr=%08lxn", fp->un.fmt2.iaddr);
- addr += sizeof(fp->un.fmt2);
- break;
- case 0x3:
- printk("eff addr=%08lxn", fp->un.fmt3.effaddr);
- addr += sizeof(fp->un.fmt3);
- break;
- case 0x4:
- printk((CPU_IS_060 ? "fault addr=%08lx fslw=%08lxn"
- : "eff addr=%08lx pc=%08lxn"),
- fp->un.fmt4.effaddr, fp->un.fmt4.pc);
- addr += sizeof(fp->un.fmt4);
- break;
- case 0x7:
- printk("eff addr=%08lx ssw=%04x faddr=%08lxn",
- fp->un.fmt7.effaddr, fp->un.fmt7.ssw, fp->un.fmt7.faddr);
- printk("wb 1 stat/addr/data: %04x %08lx %08lxn",
- fp->un.fmt7.wb1s, fp->un.fmt7.wb1a, fp->un.fmt7.wb1dpd0);
- printk("wb 2 stat/addr/data: %04x %08lx %08lxn",
- fp->un.fmt7.wb2s, fp->un.fmt7.wb2a, fp->un.fmt7.wb2d);
- printk("wb 3 stat/addr/data: %04x %08lx %08lxn",
- fp->un.fmt7.wb3s, fp->un.fmt7.wb3a, fp->un.fmt7.wb3d);
- printk("push data: %08lx %08lx %08lx %08lxn",
- fp->un.fmt7.wb1dpd0, fp->un.fmt7.pd1, fp->un.fmt7.pd2,
- fp->un.fmt7.pd3);
- addr += sizeof(fp->un.fmt7);
- break;
- case 0x9:
- printk("instr addr=%08lxn", fp->un.fmt9.iaddr);
- addr += sizeof(fp->un.fmt9);
- break;
- case 0xa:
- printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lxn",
- 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:
- printk("ssw=%04x isc=%04x isb=%04x daddr=%08lx dobuf=%08lxn",
- fp->un.fmtb.ssw, fp->un.fmtb.isc, fp->un.fmtb.isb,
- fp->un.fmtb.daddr, fp->un.fmtb.dobuf);
- printk("baddr=%08lx dibuf=%08lx ver=%xn",
- fp->un.fmtb.baddr, fp->un.fmtb.dibuf, fp->un.fmtb.ver);
- addr += sizeof(fp->un.fmtb);
- break;
- default:
- printk("n");
- }
- stack = (unsigned long *)addr;
- endstack = (unsigned long *)((addr + THREAD_SIZE - 1) & -THREAD_SIZE);
- printk("Stack from %08lx:", (unsigned long)stack);
- for (i = 0; i < kstack_depth_to_print; i++) {
- if (stack + 1 > endstack)
- break;
- if (i % 8 == 0)
- printk("n ");
- printk(" %08lx", *stack++);
- }
- printk("n");
- show_trace((unsigned long *)addr);
- printk("Code: ");
- for (i = 0; i < 10; i++)
- printk("%04x ", 0xffff & ((short *) fp->ptregs.pc)[i]);
- printk ("n");
- }
- /*
- * The architecture-independent backtrace generator
- */
- void dump_stack(void)
- {
- show_stack(0);
- }
- void bad_super_trap (struct frame *fp)
- {
- console_verbose();
- if (fp->ptregs.vector < 4*sizeof(vec_names)/sizeof(vec_names[0]))
- printk ("*** %s *** FORMAT=%Xn",
- vec_names[(fp->ptregs.vector) >> 2],
- fp->ptregs.format);
- else
- printk ("*** Exception %d *** FORMAT=%Xn",
- (fp->ptregs.vector) >> 2,
- fp->ptregs.format);
- if (fp->ptregs.vector >> 2 == VEC_ADDRERR && CPU_IS_020_OR_030) {
- unsigned short ssw = fp->un.fmtb.ssw;
- printk ("SSW=%#06x ", ssw);
- if (ssw & RC)
- printk ("Pipe stage C instruction fault at %#010lxn",
- (fp->ptregs.format) == 0xA ?
- fp->ptregs.pc + 2 : fp->un.fmtb.baddr - 2);
- if (ssw & RB)
- printk ("Pipe stage B instruction fault at %#010lxn",
- (fp->ptregs.format) == 0xA ?
- fp->ptregs.pc + 4 : fp->un.fmtb.baddr);
- if (ssw & DF)
- printk ("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);
- }
- printk ("Current process id is %dn", current->pid);
- die_if_kernel("BAD KERNEL TRAP", &fp->ptregs, 0);
- }
- asmlinkage void trap_c(struct frame *fp)
- {
- int sig;
- siginfo_t info;
- if (fp->ptregs.sr & PS_S) {
- if ((fp->ptregs.vector >> 2) == VEC_TRACE) {
- /* traced a trapping instruction */
- current->ptrace |= PT_DTRACE;
- } else
- bad_super_trap(fp);
- return;
- }
- /* send the appropriate signal to the user program */
- switch ((fp->ptregs.vector) >> 2) {
- case VEC_ADDRERR:
- info.si_code = BUS_ADRALN;
- sig = SIGBUS;
- break;
- case VEC_ILLEGAL:
- case VEC_LINE10:
- case VEC_LINE11:
- info.si_code = ILL_ILLOPC;
- sig = SIGILL;
- break;
- case VEC_PRIV:
- info.si_code = ILL_PRVOPC;
- sig = SIGILL;
- break;
- case VEC_COPROC:
- info.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:
- info.si_code = ILL_ILLTRP;
- sig = SIGILL;
- break;
- case VEC_FPBRUC:
- case VEC_FPOE:
- case VEC_FPNAN:
- info.si_code = FPE_FLTINV;
- sig = SIGFPE;
- break;
- case VEC_FPIR:
- info.si_code = FPE_FLTRES;
- sig = SIGFPE;
- break;
- case VEC_FPDIVZ:
- info.si_code = FPE_FLTDIV;
- sig = SIGFPE;
- break;
- case VEC_FPUNDER:
- info.si_code = FPE_FLTUND;
- sig = SIGFPE;
- break;
- case VEC_FPOVER:
- info.si_code = FPE_FLTOVF;
- sig = SIGFPE;
- break;
- case VEC_ZERODIV:
- info.si_code = FPE_INTDIV;
- sig = SIGFPE;
- break;
- case VEC_CHK:
- case VEC_TRAP:
- info.si_code = FPE_INTOVF;
- sig = SIGFPE;
- break;
- case VEC_TRACE: /* ptrace single step */
- info.si_code = TRAP_TRACE;
- sig = SIGTRAP;
- break;
- case VEC_TRAP15: /* breakpoint */
- info.si_code = TRAP_BRKPT;
- sig = SIGTRAP;
- break;
- default:
- info.si_code = ILL_ILLOPC;
- sig = SIGILL;
- break;
- }
- info.si_signo = sig;
- info.si_errno = 0;
- switch (fp->ptregs.format) {
- default:
- info.si_addr = (void *) fp->ptregs.pc;
- break;
- case 2:
- info.si_addr = (void *) fp->un.fmt2.iaddr;
- break;
- case 7:
- info.si_addr = (void *) fp->un.fmt7.effaddr;
- break;
- case 9:
- info.si_addr = (void *) fp->un.fmt9.iaddr;
- break;
- case 10:
- info.si_addr = (void *) fp->un.fmta.daddr;
- break;
- case 11:
- info.si_addr = (void *) fp->un.fmtb.daddr;
- break;
- }
- force_sig_info (sig, &info, current);
- }
- void die_if_kernel (char *str, struct pt_regs *fp, int nr)
- {
- if (!(fp->sr & PS_S))
- return;
- console_verbose();
- printk("%s: %08xn",str,nr);
- printk("PC: [<%08lx>]nSR: %04x SP: %p a2: %08lxn",
- fp->pc, fp->sr, fp, fp->a2);
- printk("d0: %08lx d1: %08lx d2: %08lx d3: %08lxn",
- fp->d0, fp->d1, fp->d2, fp->d3);
- printk("d4: %08lx d5: %08lx a0: %08lx a1: %08lxn",
- fp->d4, fp->d5, fp->a0, fp->a1);
- printk("Process %s (pid: %d, stackpage=%08lx)n",
- current->comm, current->pid, PAGE_SIZE+(unsigned long)current);
- show_stack((struct frame *)fp);
- do_exit(SIGSEGV);
- }
- /*
- * This function is called if an error occur while accessing
- * user-space from the fpsp040 code.
- */
- asmlinkage void fpsp040_die(void)
- {
- do_exit(SIGSEGV);
- }
- #ifdef CONFIG_M68KFPU_EMU
- asmlinkage void fpemu_signal(int signal, int code, void *addr)
- {
- siginfo_t info;
- info.si_signo = signal;
- info.si_errno = 0;
- info.si_code = code;
- info.si_addr = addr;
- force_sig_info(signal, &info, current);
- }
- #endif