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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [arch/] [m68knommu/] [kernel/] [traps.c] - Rev 1775
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/* * linux/arch/m68knommu/kernel/traps.c * * Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>, * Kenneth Albanowski <kjahds@kjahds.com> * The Silver Hammer Group, Ltd. * * (Blame me for the icky bits -- kja) * * Based on: * * linux/arch/m68k/kernel/traps.c * * Copyright (C) 1993, 1994 by Hamish Macdonald * * 68040 fixes by Michael Rausch * 68040 fixes by Martin Apel * 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. * * Feb/1999 - Greg Ungerer (gerg@moreton.com.au) changes to support ColdFire. */ /* * 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/types.h> #include <linux/a.out.h> #include <linux/user.h> #include <linux/string.h> #include <linux/linkage.h> #include <asm/setup.h> #include <asm/system.h> #include <asm/segment.h> #include <asm/traps.h> #include <asm/pgtable.h> #include <asm/machdep.h> void trap_init (void) { if (mach_trap_init) mach_trap_init(); } static inline void console_verbose(void) { extern int console_loglevel; console_loglevel = 15; if (mach_debug_init) mach_debug_init(); } extern void die_if_kernel(char *,struct pt_regs *,int); asmlinkage void trap_c(int vector, struct frame *fp); asmlinkage void buserr_c(struct frame *fp) { #if 1 extern void dump(struct pt_regs *fp); printk("%s(%d): BUSS ERROR TRAP\n", __FILE__, __LINE__); dump((struct pt_regs *) fp); #endif /* Only set esp0 if coming from user mode */ if (user_mode(&fp->ptregs)) { current->tss.esp0 = (unsigned long) fp; } else { die_if_kernel("Kernel mode BUS error",(struct pt_regs *)fp,0); } /* insert handler here */ force_sig(SIGSEGV, current); } static int bad_super_trap_count = 0; void bad_super_trap (int vector, struct frame *fp) { if (bad_super_trap_count++) { while(1); } printk ("KERNEL: Bad trap from supervisor state, vector=%d\n", vector); dump((struct pt_regs *) fp); panic ("Trap from supervisor state"); } asmlinkage void trap_c(int vector, struct frame *fp) { int sig; if ((fp->ptregs.sr & PS_S) && ((fp->ptregs.vector) >> 2) == VEC_TRACE && !(fp->ptregs.sr & PS_T)) { /* traced a trapping instruction */ unsigned char *lp = ((unsigned char *)&fp->un.fmt2) + 4; current->flags |= PF_DTRACE; /* clear the trace bit */ (*(unsigned short *)lp) &= ~PS_T; return; } else if (fp->ptregs.sr & PS_S) { bad_super_trap(vector, fp); return; } /* send the appropriate signal to the user program */ switch (vector) { case VEC_ADDRERR: sig = SIGBUS; break; case VEC_BUSERR: sig = SIGSEGV; break; case VEC_ILLEGAL: case VEC_PRIV: case VEC_LINE10: case VEC_LINE11: case VEC_COPROC: 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: sig = SIGILL; break; #ifndef NO_FPU case VEC_FPBRUC: case VEC_FPIR: case VEC_FPDIVZ: case VEC_FPUNDER: case VEC_FPOE: case VEC_FPOVER: case VEC_FPNAN: { unsigned char fstate[216]; __asm__ __volatile__ ("fsave %0@" : : "a" (fstate) : "memory"); /* Set the exception pending bit in the 68882 idle frame */ if (*(unsigned short *) fstate == 0x1f38) { fstate[fstate[1]] |= 1 << 3; __asm__ __volatile__ ("frestore %0@" : : "a" (fstate)); } } /* fall through */ #endif case VEC_ZERODIV: case VEC_TRAP: sig = SIGFPE; break; case VEC_TRACE: /* ptrace single step */ fp->ptregs.sr &= ~PS_T; case VEC_TRAP15: /* breakpoint */ sig = SIGTRAP; break; case VEC_TRAP1: /* gdbserver breakpoint */ /* kwonsk: is this right? */ fp->ptregs.pc -= 2; sig = SIGTRAP; break; default: sig = SIGILL; break; } send_sig (sig, current, 1); } asmlinkage void set_esp0 (unsigned long ssp) { current->tss.esp0 = ssp; } void die_if_kernel (char *str, struct pt_regs *fp, int nr) { if (!(fp->sr & PS_S)) return; console_verbose(); dump(fp); do_exit(SIGSEGV); }
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