traps.c
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上传日期:2013-04-10
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- /* $Id: traps.c,v 1.64 2000/09/03 15:00:49 anton Exp $
- * arch/sparc/kernel/traps.c
- *
- * Copyright 1995 David S. Miller (davem@caip.rutgers.edu)
- * Copyright 2000 Jakub Jelinek (jakub@redhat.com)
- */
- /*
- * I hate traps on the sparc, grrr...
- */
- #include <linux/config.h>
- #include <linux/sched.h> /* for jiffies */
- #include <linux/kernel.h>
- #include <linux/signal.h>
- #include <linux/smp.h>
- #include <linux/smp_lock.h>
- #include <asm/delay.h>
- #include <asm/system.h>
- #include <asm/ptrace.h>
- #include <asm/oplib.h>
- #include <asm/page.h>
- #include <asm/pgtable.h>
- #include <asm/kdebug.h>
- #include <asm/unistd.h>
- #include <asm/traps.h>
- /* #define TRAP_DEBUG */
- struct trap_trace_entry {
- unsigned long pc;
- unsigned long type;
- };
- int trap_curbuf = 0;
- struct trap_trace_entry trapbuf[1024];
- void syscall_trace_entry(struct pt_regs *regs)
- {
- printk("%s[%d]: ", current->comm, current->pid);
- printk("scall<%d> (could be %d)n", (int) regs->u_regs[UREG_G1],
- (int) regs->u_regs[UREG_I0]);
- }
- void syscall_trace_exit(struct pt_regs *regs)
- {
- }
- void sun4m_nmi(struct pt_regs *regs)
- {
- unsigned long afsr, afar;
- printk("Aieee: sun4m NMI received!n");
- /* XXX HyperSparc hack XXX */
- __asm__ __volatile__("mov 0x500, %%g1nt"
- "lda [%%g1] 0x4, %0nt"
- "mov 0x600, %%g1nt"
- "lda [%%g1] 0x4, %1nt" :
- "=r" (afsr), "=r" (afar));
- printk("afsr=%08lx afar=%08lxn", afsr, afar);
- printk("you lose buddy boy...n");
- show_regs(regs);
- prom_halt();
- }
- void sun4d_nmi(struct pt_regs *regs)
- {
- printk("Aieee: sun4d NMI received!n");
- printk("you lose buddy boy...n");
- show_regs(regs);
- prom_halt();
- }
- void instruction_dump (unsigned long *pc)
- {
- int i;
-
- if((((unsigned long) pc) & 3))
- return;
- for(i = -3; i < 6; i++)
- printk("%c%08lx%c",i?' ':'<',pc[i],i?' ':'>');
- printk("n");
- }
- #define __SAVE __asm__ __volatile__("save %sp, -0x40, %spnt")
- #define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0nt")
- void die_if_kernel(char *str, struct pt_regs *regs)
- {
- int count = 0;
- /* Amuse the user. */
- printk(
- " \|/ ____ \|/n"
- " "@'/ ,. \`@"n"
- " /_| \__/ |_\n"
- " \__U_/n");
- printk("%s(%d): %sn", current->comm, current->pid, str);
- show_regs(regs);
- __SAVE; __SAVE; __SAVE; __SAVE;
- __SAVE; __SAVE; __SAVE; __SAVE;
- __RESTORE; __RESTORE; __RESTORE; __RESTORE;
- __RESTORE; __RESTORE; __RESTORE; __RESTORE;
- {
- struct reg_window *rw = (struct reg_window *)regs->u_regs[UREG_FP];
- /* Stop the back trace when we hit userland or we
- * find some badly aligned kernel stack. Set an upper
- * bound in case our stack is trashed and we loop.
- */
- while(rw &&
- count++ < 30 &&
- (((unsigned long) rw) >= PAGE_OFFSET) &&
- !(((unsigned long) rw) & 0x7)) {
- printk("Caller[%08lx]n", rw->ins[7]);
- rw = (struct reg_window *)rw->ins[6];
- }
- }
- printk("Instruction DUMP:");
- instruction_dump ((unsigned long *) regs->pc);
- if(regs->psr & PSR_PS)
- do_exit(SIGKILL);
- do_exit(SIGSEGV);
- }
- void do_hw_interrupt(unsigned long type, unsigned long psr, unsigned long pc)
- {
- siginfo_t info;
- if(type < 0x80) {
- /* Sun OS's puke from bad traps, Linux survives! */
- printk("Unimplemented Sparc TRAP, type = %02lxn", type);
- die_if_kernel("Whee... Hello Mr. Penguin", current->thread.kregs);
- }
- if(psr & PSR_PS)
- die_if_kernel("Kernel bad trap", current->thread.kregs);
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_ILLTRP;
- info.si_addr = (void *)pc;
- info.si_trapno = type - 0x80;
- force_sig_info(SIGILL, &info, current);
- }
- void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
- unsigned long psr)
- {
- siginfo_t info;
- if(psr & PSR_PS)
- die_if_kernel("Kernel illegal instruction", regs);
- #ifdef TRAP_DEBUG
- printk("Ill instr. at pc=%08lx instruction is %08lxn",
- regs->pc, *(unsigned long *)regs->pc);
- #endif
- if (sparc_cpu_model == sun4c || sparc_cpu_model == sun4) {
- extern int do_user_muldiv (struct pt_regs *, unsigned long);
- if (!do_user_muldiv (regs, pc))
- return;
- }
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_ILLOPC;
- info.si_addr = (void *)pc;
- info.si_trapno = 0;
- send_sig_info(SIGILL, &info, current);
- }
- void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
- unsigned long psr)
- {
- siginfo_t info;
- if(psr & PSR_PS)
- die_if_kernel("Penguin instruction from Penguin mode??!?!", regs);
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_PRVOPC;
- info.si_addr = (void *)pc;
- info.si_trapno = 0;
- send_sig_info(SIGILL, &info, current);
- }
- /* XXX User may want to be allowed to do this. XXX */
- void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc,
- unsigned long psr)
- {
- siginfo_t info;
- if(regs->psr & PSR_PS) {
- printk("KERNEL MNA at pc %08lx npc %08lx called by %08lxn", pc, npc,
- regs->u_regs[UREG_RETPC]);
- die_if_kernel("BOGUS", regs);
- /* die_if_kernel("Kernel MNA access", regs); */
- }
- #if 0
- show_regs (regs);
- instruction_dump ((unsigned long *) regs->pc);
- printk ("do_MNA!n");
- #endif
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRALN;
- info.si_addr = /* FIXME: Should dig out mna address */ (void *)0;
- info.si_trapno = 0;
- send_sig_info(SIGBUS, &info, current);
- }
- extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
- void *fpqueue, unsigned long *fpqdepth);
- extern void fpload(unsigned long *fpregs, unsigned long *fsr);
- static unsigned long init_fsr = 0x0UL;
- static unsigned long init_fregs[32] __attribute__ ((aligned (8))) =
- { ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
- ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
- ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
- ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL };
- void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
- unsigned long psr)
- {
- /* Sanity check... */
- if(psr & PSR_PS)
- die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs);
- put_psr(get_psr() | PSR_EF); /* Allow FPU ops. */
- regs->psr |= PSR_EF;
- #ifndef CONFIG_SMP
- if(last_task_used_math == current)
- return;
- if(last_task_used_math) {
- /* Other processes fpu state, save away */
- struct task_struct *fptask = last_task_used_math;
- fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr,
- &fptask->thread.fpqueue[0], &fptask->thread.fpqdepth);
- }
- last_task_used_math = current;
- if(current->used_math) {
- fpload(¤t->thread.float_regs[0], ¤t->thread.fsr);
- } else {
- /* Set initial sane state. */
- fpload(&init_fregs[0], &init_fsr);
- current->used_math = 1;
- }
- #else
- if(!current->used_math) {
- fpload(&init_fregs[0], &init_fsr);
- current->used_math = 1;
- } else {
- fpload(¤t->thread.float_regs[0], ¤t->thread.fsr);
- }
- current->flags |= PF_USEDFPU;
- #endif
- }
- static unsigned long fake_regs[32] __attribute__ ((aligned (8)));
- static unsigned long fake_fsr;
- static unsigned long fake_queue[32] __attribute__ ((aligned (8)));
- static unsigned long fake_depth;
- extern int do_mathemu(struct pt_regs *, struct task_struct *);
- void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
- unsigned long psr)
- {
- static int calls;
- siginfo_t info;
- unsigned long fsr;
- int ret = 0;
- #ifndef CONFIG_SMP
- struct task_struct *fpt = last_task_used_math;
- #else
- struct task_struct *fpt = current;
- #endif
- put_psr(get_psr() | PSR_EF);
- /* If nobody owns the fpu right now, just clear the
- * error into our fake static buffer and hope it don't
- * happen again. Thank you crashme...
- */
- #ifndef CONFIG_SMP
- if(!fpt) {
- #else
- if(!(fpt->flags & PF_USEDFPU)) {
- #endif
- fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth);
- regs->psr &= ~PSR_EF;
- return;
- }
- fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr,
- &fpt->thread.fpqueue[0], &fpt->thread.fpqdepth);
- #ifdef DEBUG_FPU
- printk("Hmm, FP exception, fsr was %016lxn", fpt->thread.fsr);
- #endif
- switch ((fpt->thread.fsr & 0x1c000)) {
- /* switch on the contents of the ftt [floating point trap type] field */
- #ifdef DEBUG_FPU
- case (1 << 14):
- printk("IEEE_754_exceptionn");
- break;
- #endif
- case (2 << 14): /* unfinished_FPop (underflow & co) */
- case (3 << 14): /* unimplemented_FPop (quad stuff, maybe sqrt) */
- ret = do_mathemu(regs, fpt);
- break;
- #ifdef DEBUG_FPU
- case (4 << 14):
- printk("sequence_error (OS bug...)n");
- break;
- case (5 << 14):
- printk("hardware_error (uhoh!)n");
- break;
- case (6 << 14):
- printk("invalid_fp_register (user error)n");
- break;
- #endif /* DEBUG_FPU */
- }
- /* If we successfully emulated the FPop, we pretend the trap never happened :-> */
- if (ret) {
- fpload(¤t->thread.float_regs[0], ¤t->thread.fsr);
- return;
- }
- /* nope, better SIGFPE the offending process... */
-
- #ifdef CONFIG_SMP
- fpt->flags &= ~PF_USEDFPU;
- #endif
- if(psr & PSR_PS) {
- /* The first fsr store/load we tried trapped,
- * the second one will not (we hope).
- */
- printk("WARNING: FPU exception from kernel mode. at pc=%08lxn",
- regs->pc);
- regs->pc = regs->npc;
- regs->npc += 4;
- calls++;
- if(calls > 2)
- die_if_kernel("Too many Penguin-FPU traps from kernel mode",
- regs);
- return;
- }
- fsr = fpt->thread.fsr;
- info.si_signo = SIGFPE;
- info.si_errno = 0;
- info.si_addr = (void *)pc;
- info.si_trapno = 0;
- info.si_code = __SI_FAULT;
- if ((fsr & 0x1c000) == (1 << 14)) {
- if (fsr & 0x10)
- info.si_code = FPE_FLTINV;
- else if (fsr & 0x08)
- info.si_code = FPE_FLTOVF;
- else if (fsr & 0x04)
- info.si_code = FPE_FLTUND;
- else if (fsr & 0x02)
- info.si_code = FPE_FLTDIV;
- else if (fsr & 0x01)
- info.si_code = FPE_FLTRES;
- }
- send_sig_info(SIGFPE, &info, fpt);
- #ifndef CONFIG_SMP
- last_task_used_math = NULL;
- #endif
- regs->psr &= ~PSR_EF;
- if(calls > 0)
- calls=0;
- }
- void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc,
- unsigned long psr)
- {
- siginfo_t info;
- if(psr & PSR_PS)
- die_if_kernel("Penguin overflow trap from kernel mode", regs);
- info.si_signo = SIGEMT;
- info.si_errno = 0;
- info.si_code = EMT_TAGOVF;
- info.si_addr = (void *)pc;
- info.si_trapno = 0;
- send_sig_info(SIGEMT, &info, current);
- }
- void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc,
- unsigned long psr)
- {
- #ifdef TRAP_DEBUG
- printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lxn",
- pc, npc, psr);
- #endif
- if(psr & PSR_PS)
- panic("Tell me what a watchpoint trap is, and I'll then deal "
- "with such a beast...");
- }
- void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc,
- unsigned long psr)
- {
- siginfo_t info;
- #ifdef TRAP_DEBUG
- printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lxn",
- pc, npc, psr);
- #endif
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_OBJERR;
- info.si_addr = (void *)pc;
- info.si_trapno = 0;
- force_sig_info(SIGBUS, &info, current);
- }
- void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc,
- unsigned long psr)
- {
- siginfo_t info;
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_COPROC;
- info.si_addr = (void *)pc;
- info.si_trapno = 0;
- send_sig_info(SIGILL, &info, current);
- }
- void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc,
- unsigned long psr)
- {
- siginfo_t info;
- #ifdef TRAP_DEBUG
- printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lxn",
- pc, npc, psr);
- #endif
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_COPROC;
- info.si_addr = (void *)pc;
- info.si_trapno = 0;
- send_sig_info(SIGILL, &info, current);
- }
- void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc,
- unsigned long psr)
- {
- siginfo_t info;
- info.si_signo = SIGFPE;
- info.si_errno = 0;
- info.si_code = FPE_INTDIV;
- info.si_addr = (void *)pc;
- info.si_trapno = 0;
- send_sig_info(SIGFPE, &info, current);
- }
- /* Since we have our mappings set up, on multiprocessors we can spin them
- * up here so that timer interrupts work during initialization.
- */
- extern void sparc_cpu_startup(void);
- int linux_smp_still_initting;
- unsigned int thiscpus_tbr;
- int thiscpus_mid;
- void trap_init(void)
- {
- /* Attach to the address space of init_task. */
- atomic_inc(&init_mm.mm_count);
- current->active_mm = &init_mm;
- /* NOTE: Other cpus have this done as they are started
- * up on SMP.
- */
- }