traps.c
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上传日期:2013-02-24
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文件大小:21k
- /*
- * linux/arch/parisc/traps.c
- *
- * Copyright (C) 1991, 1992 Linus Torvalds
- * Copyright (C) 1999, 2000 Philipp Rumpf <prumpf@tux.org>
- */
- /*
- * 'Traps.c' handles hardware traps and faults after we have saved some
- * state in 'asm.s'.
- */
- #include <linux/config.h>
- #include <linux/sched.h>
- #include <linux/kernel.h>
- #include <linux/string.h>
- #include <linux/errno.h>
- #include <linux/ptrace.h>
- #include <linux/timer.h>
- #include <linux/mm.h>
- #include <linux/smp.h>
- #include <linux/smp_lock.h>
- #include <linux/spinlock.h>
- #include <linux/init.h>
- #include <linux/interrupt.h>
- #include <asm/system.h>
- #include <asm/uaccess.h>
- #include <asm/io.h>
- #include <asm/irq.h>
- #include <asm/atomic.h>
- #include <asm/smp.h>
- #include <asm/pdc.h>
- #ifdef CONFIG_KWDB
- #include <kdb/break.h> /* for BI2_KGDB_GDB */
- #include <kdb/kgdb_types.h> /* for __() */
- #include <kdb/save_state.h> /* for struct save_state */
- #include <kdb/kgdb_machine.h> /* for pt_regs_to_ssp and ssp_to_pt_regs */
- #include <kdb/trap.h> /* for I_BRK_INST */
- #endif /* CONFIG_KWDB */
- static inline void console_verbose(void)
- {
- console_loglevel = 15;
- }
- void page_exception(void);
- /*
- * These constants are for searching for possible module text
- * segments. VMALLOC_OFFSET comes from mm/vmalloc.c; MODULE_RANGE is
- * a guess of how much space is likely to be vmalloced.
- */
- #define VMALLOC_OFFSET (8*1024*1024)
- #define MODULE_RANGE (8*1024*1024)
- int kstack_depth_to_print = 24;
- static void printbinary(unsigned long x, int nbits)
- {
- unsigned long mask = 1UL << (nbits - 1);
- while (mask != 0) {
- printk(mask & x ? "1" : "0");
- mask >>= 1;
- }
- }
- void show_regs(struct pt_regs *regs)
- {
- int i;
- #ifdef __LP64__
- #define RFMT " %016lx"
- #else
- #define RFMT " %08lx"
- #endif
- printk("n"); /* don't want to have that pretty register dump messed up */
- printk(" YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDInPSW: ");
- printbinary(regs->gr[0], 32);
- printk(" %sn", print_tainted());
- for (i = 0; i < 32; i += 4) {
- int j;
- printk("r%d-%dt", i, i + 3);
- for (j = 0; j < 4; j++) {
- printk(RFMT, i + j == 0 ? 0 : regs->gr[i + j]);
- }
- printk("n");
- }
- for (i = 0; i < 8; i += 4) {
- int j;
- printk("sr%d-%dt", i, i + 4);
- for (j = 0; j < 4; j++) {
- printk(RFMT, regs->sr[i + j]);
- }
- printk("n");
- }
- #if REDICULOUSLY_VERBOSE
- for (i = 0; i < 32; i++) {
- printk("FR%2d : %016lx ", i, regs->fr[i]);
- if ((i & 1) == 1)
- printk("n");
- }
- #endif
- printk("nIASQ:" RFMT RFMT " IAOQ:" RFMT RFMT "n",
- regs->iasq[0], regs->iasq[1], regs->iaoq[0], regs->iaoq[1]);
- printk(" IIR: %08lx ISR:" RFMT " IOR:" RFMT "nORIG_R28:" RFMT
- "n", regs->iir, regs->isr, regs->ior, regs->orig_r28);
- }
- void
- die_if_kernel (char *str, struct pt_regs *regs, long err)
- {
- if (user_mode(regs)) {
- #if 1
- if (err == 0)
- return; /* STFU */
- /* XXX for debugging only */
- printk ("!!die_if_kernel: %s(%d): %s %ldn",
- current->comm, current->pid, str, err);
- show_regs(regs);
- #endif
- return;
- }
- printk("%s[%d]: %s %ldn", current->comm, current->pid, str, err);
- show_regs(regs);
- /* Wot's wrong wif bein' racy? */
- if (current->thread.flags & PARISC_KERNEL_DEATH) {
- printk("die_if_kernel recursion detected.n");
- sti();
- while (1);
- }
- current->thread.flags |= PARISC_KERNEL_DEATH;
- do_exit(SIGSEGV);
- }
- asmlinkage void cache_flush_denied(struct pt_regs * regs, long error_code)
- {
- }
- asmlinkage void do_general_protection(struct pt_regs * regs, long error_code)
- {
- }
- #ifndef CONFIG_MATH_EMULATION
- asmlinkage void math_emulate(long arg)
- {
- }
- #endif /* CONFIG_MATH_EMULATION */
- int syscall_ipi(int (*syscall) (struct pt_regs *), struct pt_regs *regs)
- {
- return syscall(regs);
- }
- struct {
- int retval;
- int (*func) (void *, struct pt_regs *);
- void * data;
- } ipi_action[NR_CPUS];
- void ipi_interrupt(int irq, void *unused, struct pt_regs *regs)
- {
- int cpu = smp_processor_id();
- if(!ipi_action[cpu].func)
- BUG();
- ipi_action[cpu].retval =
- ipi_action[cpu].func(ipi_action[cpu].data, regs);
- }
- /* gdb uses break 4,8 */
- #define GDB_BREAK_INSN 0x10004
- void handle_gdb_break(struct pt_regs *regs, int wot)
- {
- struct siginfo si;
- si.si_code = wot;
- si.si_addr = (void *) (regs->iaoq[0] & ~3);
- si.si_signo = SIGTRAP;
- si.si_errno = 0;
- force_sig_info(SIGTRAP, &si, current);
- }
- void handle_break(unsigned iir, struct pt_regs *regs)
- {
- struct siginfo si;
- #ifdef CONFIG_KWDB
- struct save_state ssp;
- #endif /* CONFIG_KWDB */
- flush_all_caches();
- switch(iir) {
- case 0x00:
- /* show registers, halt */
- cli();
- printk("break 0,0: pid=%d command='%s'n",
- current->pid, current->comm);
- die_if_kernel("Breakpoint", regs, 0);
- show_regs(regs);
- si.si_code = TRAP_BRKPT;
- si.si_addr = (void *) (regs->iaoq[0] & ~3);
- si.si_signo = SIGTRAP;
- force_sig_info(SIGTRAP, &si, current);
- break;
- case GDB_BREAK_INSN:
- die_if_kernel("Breakpoint", regs, 0);
- handle_gdb_break(regs, TRAP_BRKPT);
- break;
- #ifdef CONFIG_KWDB
- case KGDB_BREAK_INSN:
- mtctl(0, 15);
- pt_regs_to_ssp(regs, &ssp);
- kgdb_trap(I_BRK_INST, &ssp, 1);
- ssp_to_pt_regs(&ssp, regs);
- break;
- case KGDB_INIT_BREAK_INSN:
- mtctl(0, 15);
- pt_regs_to_ssp(regs, &ssp);
- kgdb_trap(I_BRK_INST, &ssp, 1);
- ssp_to_pt_regs(&ssp, regs);
- /* Advance pcoq to skip break */
- regs->iaoq[0] = regs->iaoq[1];
- regs->iaoq[1] += 4;
- break;
- #endif /* CONFIG_KWDB */
- default:
- set_eiem(0);
- printk("break %#08x: pid=%d command='%s'n",
- iir, current->pid, current->comm);
- show_regs(regs);
- si.si_signo = SIGTRAP;
- si.si_code = TRAP_BRKPT;
- si.si_addr = (void *) (regs->iaoq[0] & ~3);
- force_sig_info(SIGTRAP, &si, current);
- return;
- }
- }
- /* Format of the floating-point exception registers. */
- struct exc_reg {
- unsigned int exception : 6;
- unsigned int ei : 26;
- };
- /* Macros for grabbing bits of the instruction format from the 'ei'
- field above. */
- /* Major opcode 0c and 0e */
- #define FP0CE_UID(i) (((i) >> 6) & 3)
- #define FP0CE_CLASS(i) (((i) >> 9) & 3)
- #define FP0CE_SUBOP(i) (((i) >> 13) & 7)
- #define FP0CE_SUBOP1(i) (((i) >> 15) & 7) /* Class 1 subopcode */
- #define FP0C_FORMAT(i) (((i) >> 11) & 3)
- #define FP0E_FORMAT(i) (((i) >> 11) & 1)
- /* Major opcode 0c, uid 2 (performance monitoring) */
- #define FPPM_SUBOP(i) (((i) >> 9) & 0x1f)
- /* Major opcode 2e (fused operations). */
- #define FP2E_SUBOP(i) (((i) >> 5) & 1)
- #define FP2E_FORMAT(i) (((i) >> 11) & 1)
- /* Major opcode 26 (FMPYSUB) */
- /* Major opcode 06 (FMPYADD) */
- #define FPx6_FORMAT(i) ((i) & 0x1f)
- /* Flags and enable bits of the status word. */
- #define FPSW_FLAGS(w) ((w) >> 27)
- #define FPSW_ENABLE(w) ((w) & 0x1f)
- #define FPSW_V (1<<4)
- #define FPSW_Z (1<<3)
- #define FPSW_O (1<<2)
- #define FPSW_U (1<<1)
- #define FPSW_I (1<<0)
- /* Emulate a floating point instruction if necessary and possible
- (this will be moved elsewhere eventually). Return zero if
- successful or if emulation was not required, -1 if the instruction
- is actually illegal or unimplemented. The status word passed as
- the first parameter will be modified to signal exceptions, if
- any. */
- /* FIXME!!! This is really incomplete and, at the moment, most
- illegal FP instructions will simply act as no-ops. Obviously that
- is *not* what we want. Also we don't even try to handle exception
- types other than the 'unimplemented' ones. */
- int
- fp_emul_insn(u32 *sw, struct exc_reg exc, struct pt_regs *regs)
- {
- switch (exc.exception) {
- case 0x3: /* Unimplemented, opcode 06 */
- break;
- case 0x9: /* Unimplemented, opcode 0c */
- /* We do not support quadword operations, end of
- story. There's no support for them in GCC. */
- if (FP0C_FORMAT(exc.ei) == 3)
- return -1; /* SIGILL */
- /* Fall through. */
- case 0xa: /* Unimplemented, opcode 0e */
- if (FP0CE_CLASS(exc.ei) == 1) {
- /* FCNV instructions of various sorts. */
- } else {
- if (FP0CE_CLASS(exc.ei == 0)
- && FP0CE_SUBOP(exc.ei == 5)) {
- /* FRND instructions should be
- emulated, at some point, I
- guess. */
- return -1; /* SIGILL */
- }
- }
- break;
- case 0x23: /* Unimplemented, opcode 26 */
- break;
- case 0x2b: /* Unimplemented, opcode 2e */
- break;
- case 0x1: /* Unimplemented, opcode 0e/0c */
- /* FIXME: How the hell are we supposed to tell which
- opcode it is? */
- break;
- default:
- return -1; /* Punt */
- }
- return 0;
- }
- /* Handle a floating point exception. Return zero if the faulting
- instruction can be completed successfully. */
- int
- handle_fpe(struct pt_regs *regs)
- {
- struct siginfo si;
- union {
- struct fpsw {
- /* flag bits */
- unsigned int fv : 1;
- unsigned int fz : 1;
- unsigned int fo : 1;
- unsigned int fu : 1;
- unsigned int fi : 1;
- unsigned int c : 1;
- unsigned int pad1 : 4;
- unsigned int cq : 11;
- unsigned int rm : 2;
- unsigned int pad2 : 2;
- unsigned int t : 1;
- unsigned int d : 1;
- /* enable bits */
- unsigned int ev : 1;
- unsigned int ez : 1;
- unsigned int eo : 1;
- unsigned int eu : 1;
- unsigned int ei : 1;
- } status;
- u32 word;
- } sw;
- struct exc_reg excepts[7];
- unsigned int code = 0;
- unsigned int throw;
- /* Status word = FR0L. */
- memcpy(&sw, regs->fr, sizeof(sw));
- /* Exception words = FR0R-FR3R. */
- memcpy(excepts, ((char *) regs->fr) + 4, sizeof(excepts));
- /* This is all CPU dependent. Since there is no public
- documentation on the PA2.0 processors we will just assume
- everything is like the 7100/7100LC/7300LC for now.
- Specifically: All exceptions are marked as "unimplemented"
- in the exception word, and the only exception word used is
- excepts[1]. */
- /* Try to emulate the instruction. Also determine if it is
- really an illegal instruction in the process.
- FIXME: fp_emul_insn() only checks for the "unimplemented"
- exceptions at the moment. So this may break horribly on
- PA2.0, where we may want to also check to see if we should
- just send SIGFPE (or maybe not, let's see the documentation
- first...) */
- if (fp_emul_insn(&sw.word, excepts[1], regs) == -1)
- goto send_sigill;
- /* Take the intersection of the flag bits in the FPSW and the
- enable bits in the FPSW. */
- throw = FPSW_FLAGS(sw.word) & FPSW_ENABLE(sw.word);
- /* Concoct an appropriate si_code. Of course we don't know
- what to do if multiple exceptions were enabled and multiple
- flags were set. Maybe that's why HP/UX doesn't implement
- feenableexcept(). */
- if (throw == 0)
- goto success; /* Duh. */
- else if (throw & FPSW_V)
- code = FPE_FLTINV;
- else if (throw & FPSW_Z)
- code = FPE_FLTDIV;
- else if (throw & FPSW_O)
- code = FPE_FLTOVF;
- else if (throw & FPSW_U)
- code = FPE_FLTUND;
- else if (throw & FPSW_I)
- code = FPE_FLTRES;
- #if 1 /* Debugging... */
- printk("Unemulated floating point exception, pid=%d (%s)n",
- current->pid, current->comm);
- show_regs(regs);
- {
- int i;
- printk("FP Status: %08xn", sw.word);
- printk("FP Exceptions:n");
- for (i = 0; i < 7; i++) {
- printk("tExcept%d: exception %03x insn %06xn",
- i, excepts[i].exception, excepts[i].ei);
- }
- }
- #endif
- /* FIXME: Should we clear the flag bits, T bit, and exception
- registers here? */
- si.si_signo = SIGFPE;
- si.si_errno = 0;
- si.si_code = code;
- si.si_addr = (void *) regs->iaoq[0];
- force_sig_info(SIGFPE, &si, current);
- return -1;
- send_sigill:
- si.si_signo = SIGILL;
- si.si_errno = 0;
- si.si_code = ILL_COPROC;
- si.si_addr = (void *) regs->iaoq[0];
- force_sig_info(SIGILL, &si, current);
- return -1;
- success:
- /* We absolutely have to clear the T bit and exception
- registers to allow the process to recover. Otherwise every
- subsequent floating point instruction will trap. */
- sw.status.t = 0;
- memset(excepts, 0, sizeof(excepts));
- memcpy(regs->fr, &sw, sizeof(sw));
- memcpy(((char *) regs->fr) + 4,excepts , sizeof(excepts));
- return 0;
- }
- int handle_toc(void)
- {
- return 0;
- }
- void default_trap(int code, struct pt_regs *regs)
- {
- printk("Trap %d on CPU %dn", code, smp_processor_id());
- show_regs(regs);
- }
- void (*cpu_lpmc) (int code, struct pt_regs *regs) = default_trap;
- #ifdef CONFIG_KWDB
- int
- debug_call (void) {
- printk ("Debug call.n");
- return 0;
- }
- int
- debug_call_leaf (void) {
- return 0;
- }
- #endif /* CONFIG_KWDB */
- extern void do_page_fault(struct pt_regs *, int, unsigned long);
- extern void parisc_terminate(char *, struct pt_regs *, int, unsigned long);
- extern void transfer_pim_to_trap_frame(struct pt_regs *);
- extern void pdc_console_restart(void);
- void handle_interruption(int code, struct pt_regs *regs)
- {
- unsigned long fault_address = 0;
- unsigned long fault_space = 0;
- struct siginfo si;
- #ifdef CONFIG_KWDB
- struct save_state ssp;
- #endif /* CONFIG_KWDB */
- if (code == 1)
- pdc_console_restart(); /* switch back to pdc if HPMC */
- else
- sti();
- #ifdef __LP64__
- /*
- * FIXME:
- * For 32 bit processes we don't want the b bits (bits 0 & 1)
- * in the ior. This is more appropriately handled in the tlb
- * miss handlers. Changes need to be made to support addresses
- * >32 bits for 64 bit processes.
- */
- regs->ior &= 0x3FFFFFFFFFFFFFFFUL;
- #endif
- #if 0
- printk("interrupted with code %d, regs %pn", code, regs);
- show_regs(regs);
- #endif
- switch(code) {
- case 1:
- parisc_terminate("High Priority Machine Check (HPMC)",regs,code,0);
- /* NOT REACHED */
- case 3: /* Recovery counter trap */
- regs->gr[0] &= ~PSW_R;
- if (regs->iasq[0])
- handle_gdb_break(regs, TRAP_TRACE);
- /* else this must be the start of a syscall - just let it
- * run.
- */
- return;
- case 5:
- flush_all_caches();
- cpu_lpmc(5, regs);
- return;
- case 6:
- fault_address = regs->iaoq[0];
- fault_space = regs->iasq[0];
- break;
- case 9: /* Break Instruction */
- handle_break(regs->iir,regs);
- return;
- case 14:
- /* Assist Exception Trap, i.e. floating point exception. */
- die_if_kernel("Floating point exception", regs, 0); /* quiet */
- handle_fpe(regs);
- return;
- case 15:
- case 16: /* Non-Access TLB miss faulting address is in IOR */
- case 17:
- case 26:
- fault_address = regs->ior;
- fault_space = regs->isr;
- if (code == 26 && fault_space == 0)
- parisc_terminate("Data access rights fault in kernel",regs,code,fault_address);
- break;
- case 19:
- regs->gr[0] |= PSW_X; /* So we can single-step over the trap */
- /* fall thru */
- case 21:
- handle_gdb_break(regs, TRAP_HWBKPT);
- return;
- case 25: /* Taken branch trap */
- regs->gr[0] &= ~PSW_T;
- if (regs->iasq[0])
- handle_gdb_break(regs, TRAP_BRANCH);
- /* else this must be the start of a syscall - just let it
- * run.
- */
- return;
- #if 0 /* def CONFIG_KWDB */
- case I_TAKEN_BR: /* 25 */
- mtctl(0, 15);
- pt_regs_to_ssp(regs, &ssp);
- kgdb_trap(I_TAKEN_BR, &ssp, 1);
- ssp_to_pt_regs(&ssp, regs);
- break;
- #endif /* CONFIG_KWDB */
- case 8:
- die_if_kernel("Illegal instruction", regs, code);
- si.si_code = ILL_ILLOPC;
- goto give_sigill;
- case 10:
- die_if_kernel("Priviledged operation - shouldn't happen!", regs, code);
- si.si_code = ILL_PRVOPC;
- goto give_sigill;
- case 11:
- die_if_kernel("Priviledged register - shouldn't happen!", regs, code);
- si.si_code = ILL_PRVREG;
- give_sigill:
- si.si_signo = SIGILL;
- si.si_errno = 0;
- si.si_addr = (void *) regs->iaoq[0];
- force_sig_info(SIGILL, &si, current);
- return;
- case 28: /* Unaligned just causes SIGBUS for now */
- die_if_kernel("Unaligned data reference", regs, code);
- si.si_code = BUS_ADRALN;
- si.si_signo = SIGBUS;
- si.si_errno = 0;
- si.si_addr = (void *) regs->ior;
- force_sig_info(SIGBUS, &si, current);
- return;
- default:
- if (user_mode(regs)) {
- printk("nhandle_interruption() pid=%d command='%s'n",
- current->pid, current->comm);
- show_regs(regs);
- /* SIGBUS, for lack of a better one. */
- si.si_signo = SIGBUS;
- si.si_code = BUS_OBJERR;
- si.si_errno = 0;
- si.si_addr = (void *) regs->ior;
- force_sig_info(SIGBUS, &si, current);
- return;
- }
- parisc_terminate("Unexpected Interruption!",regs,code,0);
- /* NOT REACHED */
- }
- if (user_mode(regs)) {
- if (fault_space != regs->sr[7]) {
- if (fault_space == 0)
- printk("User Fault on Kernel Space ");
- else /* this case should never happen, but whatever... */
- printk("User Fault (long pointer) ");
- printk("pid=%d command='%s'n", current->pid, current->comm);
- show_regs(regs);
- si.si_signo = SIGSEGV;
- si.si_errno = 0;
- si.si_code = SEGV_MAPERR;
- si.si_addr = (void *) regs->ior;
- force_sig_info(SIGSEGV, &si, current);
- return;
- }
- }
- else {
- /*
- * The kernel should never fault on its own address space.
- */
- if (fault_space == 0)
- parisc_terminate("Kernel Fault",regs,code,fault_address);
- }
- #ifdef CONFIG_KWDB
- debug_call_leaf ();
- #endif /* CONFIG_KWDB */
- do_page_fault(regs, code, fault_address);
- /*
- * This should not be necessary.
- * However, we do not currently
- * implement flush_page_to_ram.
- *
- * The problem is that if we just
- * brought in some code through the
- * D-cache, the I-cache may not see
- * it since it hasn't been flushed
- * to ram.
- */
- /* flush_all_caches(); */
- #if 0
- printk("returning %pn", regs);
- /* show_regs(regs); */
- #endif
- return;
- }
- void show_stack(unsigned long sp)
- {
- #if 1
- if ((sp & 0xc0000000UL) == 0xc0000000UL) {
- __u32 *stackptr;
- __u32 *dumpptr;
- /* Stack Dump! */
- stackptr = (__u32 *)sp;
- dumpptr = (__u32 *)(sp & ~(INIT_TASK_SIZE - 1));
- printk("nDumping Stack from %p to %p:n",dumpptr,stackptr);
- while (dumpptr < stackptr) {
- printk("%04x %08x %08x %08x %08x %08x %08x %08x %08xn",
- ((__u32)dumpptr) & 0xffff,
- dumpptr[0], dumpptr[1], dumpptr[2], dumpptr[3],
- dumpptr[4], dumpptr[5], dumpptr[6], dumpptr[7]);
- dumpptr += 8;
- }
- }
- #endif
- }
- void parisc_terminate(char *msg, struct pt_regs *regs, int code, unsigned long offset)
- {
- set_eiem(0);
- cli();
- if (code == 1)
- transfer_pim_to_trap_frame(regs);
- #if 1
- show_stack(regs->gr[30]);
- #endif
- printk("n%s: Code=%d regs=%p (Addr=%08lx)n",msg,code,regs,offset);
- show_regs(regs);
- for(;;)
- ;
- }
- void transfer_pim_to_trap_frame(struct pt_regs *regs)
- {
- register int i;
- extern unsigned int hpmc_pim_data[];
- struct pdc_hpmc_pim_11 *pim_narrow;
- struct pdc_hpmc_pim_20 *pim_wide;
- if (boot_cpu_data.cpu_type >= pcxu) {
- pim_wide = (struct pdc_hpmc_pim_20 *)hpmc_pim_data;
- /*
- * Note: The following code will probably generate a
- * bunch of truncation error warnings from the compiler.
- * Could be handled with an ifdef, but perhaps there
- * is a better way.
- */
- regs->gr[0] = pim_wide->cr[22];
- for (i = 1; i < 32; i++)
- regs->gr[i] = pim_wide->gr[i];
- for (i = 0; i < 32; i++)
- regs->fr[i] = pim_wide->fr[i];
- for (i = 0; i < 8; i++)
- regs->sr[i] = pim_wide->sr[i];
- regs->iasq[0] = pim_wide->cr[17];
- regs->iasq[1] = pim_wide->iasq_back;
- regs->iaoq[0] = pim_wide->cr[18];
- regs->iaoq[1] = pim_wide->iaoq_back;
- regs->cr30 = pim_wide->cr[30];
- regs->sar = pim_wide->cr[11];
- regs->iir = pim_wide->cr[19];
- regs->isr = pim_wide->cr[20];
- regs->ior = pim_wide->cr[21];
- }
- else {
- pim_narrow = (struct pdc_hpmc_pim_11 *)hpmc_pim_data;
- regs->gr[0] = pim_narrow->cr[22];
- for (i = 1; i < 32; i++)
- regs->gr[i] = pim_narrow->gr[i];
- for (i = 0; i < 32; i++)
- regs->fr[i] = pim_narrow->fr[i];
- for (i = 0; i < 8; i++)
- regs->sr[i] = pim_narrow->sr[i];
- regs->iasq[0] = pim_narrow->cr[17];
- regs->iasq[1] = pim_narrow->iasq_back;
- regs->iaoq[0] = pim_narrow->cr[18];
- regs->iaoq[1] = pim_narrow->iaoq_back;
- regs->cr30 = pim_narrow->cr[30];
- regs->sar = pim_narrow->cr[11];
- regs->iir = pim_narrow->cr[19];
- regs->isr = pim_narrow->cr[20];
- regs->ior = pim_narrow->cr[21];
- }
- /*
- * The following fields only have meaning if we came through
- * another path. So just zero them here.
- */
- regs->ksp = 0;
- regs->kpc = 0;
- regs->orig_r28 = 0;
- }
- int __init check_ivt(void *iva)
- {
- int i;
- u32 check = 0;
- u32 *ivap;
- u32 *hpmcp;
- u32 length;
- extern void os_hpmc(void);
- extern void os_hpmc_end(void);
- if(strcmp((char *)iva, "cows can fly"))
- return -1;
- ivap = (u32 *)iva;
- for (i = 0; i < 8; i++)
- *ivap++ = 0;
- /* Compute Checksum for HPMC handler */
- length = (u32)((unsigned long)os_hpmc_end - (unsigned long)os_hpmc);
- ivap[7] = length;
- hpmcp = (u32 *)os_hpmc;
- for(i=0; i<length/4; i++)
- check += *hpmcp++;
- for(i=0; i<8; i++)
- check += ivap[i];
- ivap[5] = -check;
- return 0;
- }
-
- #ifndef __LP64__
- extern const void fault_vector_11;
- #endif
- extern const void fault_vector_20;
- void __init trap_init(void)
- {
- volatile long eiem;
- void *iva;
- printk("trap_initn");
-
- if (boot_cpu_data.cpu_type >= pcxu)
- iva = (void *) &fault_vector_20;
- else
- #ifdef __LP64__
- panic("Can't boot 64-bit OS on PA1.1 processor!");
- #else
- iva = (void *) &fault_vector_11;
- #endif
- if(check_ivt(iva))
- panic("IVT invalid");
- mtctl(0, 30);
- mtctl(90000000, 16);
- set_eiem(-1L);
- mtctl(-1L, 23);
- asm volatile ("rsm 0,%0" : "=r" (eiem));
- }