traps.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:23k
- /*
- * 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.
- *
- * Copyright (C) 1994 - 1999, 2000, 01 Ralf Baechle
- * Modified for R3000 by Paul M. Antoine, 1995, 1996
- * Complete output from die() by Ulf Carlsson, 1998
- * Copyright (C) 1999 Silicon Graphics, Inc.
- *
- * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
- * Copyright (C) 2000, 01 MIPS Technologies, Inc.
- */
- #include <linux/config.h>
- #include <linux/init.h>
- #include <linux/mm.h>
- #include <linux/module.h>
- #include <linux/sched.h>
- #include <linux/smp.h>
- #include <linux/smp_lock.h>
- #include <linux/spinlock.h>
- #include <asm/bootinfo.h>
- #include <asm/branch.h>
- #include <asm/cpu.h>
- #include <asm/cachectl.h>
- #include <asm/inst.h>
- #include <asm/jazz.h>
- #include <asm/module.h>
- #include <asm/pgtable.h>
- #include <asm/io.h>
- #include <asm/siginfo.h>
- #include <asm/watch.h>
- #include <asm/system.h>
- #include <asm/uaccess.h>
- #include <asm/mmu_context.h>
- /*
- * Machine specific interrupt handlers
- */
- extern asmlinkage void acer_pica_61_handle_int(void);
- extern asmlinkage void decstation_handle_int(void);
- extern asmlinkage void deskstation_rpc44_handle_int(void);
- extern asmlinkage void deskstation_tyne_handle_int(void);
- extern asmlinkage void mips_magnum_4000_handle_int(void);
- extern asmlinkage void handle_mod(void);
- extern asmlinkage void handle_tlbl(void);
- extern asmlinkage void handle_tlbs(void);
- extern asmlinkage void handle_adel(void);
- extern asmlinkage void handle_ades(void);
- extern asmlinkage void handle_ibe(void);
- extern asmlinkage void handle_dbe(void);
- extern asmlinkage void handle_sys(void);
- extern asmlinkage void handle_bp(void);
- extern asmlinkage void handle_ri(void);
- extern asmlinkage void handle_cpu(void);
- extern asmlinkage void handle_ov(void);
- extern asmlinkage void handle_tr(void);
- extern asmlinkage void handle_fpe(void);
- extern asmlinkage void handle_watch(void);
- extern asmlinkage void handle_mcheck(void);
- extern asmlinkage void handle_reserved(void);
- extern int fpu_emulator_cop1Handler(struct pt_regs *);
- char watch_available = 0;
- void (*ibe_board_handler)(struct pt_regs *regs);
- void (*dbe_board_handler)(struct pt_regs *regs);
- int kstack_depth_to_print = 24;
- /*
- * These constant is for searching for possible module text segments.
- * MODULE_RANGE is a guess of how much space is likely to be vmalloced.
- */
- #define MODULE_RANGE (8*1024*1024)
- #ifndef CONFIG_CPU_HAS_LLSC
- /*
- * This stuff is needed for the userland ll-sc emulation for R2300
- */
- void simulate_ll(struct pt_regs *regs, unsigned int opcode);
- void simulate_sc(struct pt_regs *regs, unsigned int opcode);
- #define OPCODE 0xfc000000
- #define BASE 0x03e00000
- #define RT 0x001f0000
- #define OFFSET 0x0000ffff
- #define LL 0xc0000000
- #define SC 0xe0000000
- #endif
- /*
- * This routine abuses get_user()/put_user() to reference pointers
- * with at least a bit of error checking ...
- */
- void show_stack(unsigned int *sp)
- {
- int i;
- unsigned int *stack;
- stack = sp;
- i = 0;
- printk("Stack:");
- while ((unsigned long) stack & (PAGE_SIZE - 1)) {
- unsigned long stackdata;
- if (__get_user(stackdata, stack++)) {
- printk(" (Bad stack address)");
- break;
- }
- printk(" %08lx", stackdata);
- if (++i > 40) {
- printk(" ...");
- break;
- }
- if (i % 8 == 0)
- printk("n ");
- }
- }
- void show_trace(unsigned int *sp)
- {
- int i;
- unsigned int *stack;
- unsigned long kernel_start, kernel_end;
- unsigned long module_start, module_end;
- extern char _stext, _etext;
- stack = sp;
- i = 0;
- kernel_start = (unsigned long) &_stext;
- kernel_end = (unsigned long) &_etext;
- module_start = VMALLOC_START;
- module_end = module_start + MODULE_RANGE;
- printk("nCall Trace:");
- while ((unsigned long) stack & (PAGE_SIZE -1)) {
- unsigned long addr;
- if (__get_user(addr, stack++)) {
- printk(" (Bad stack address)n");
- break;
- }
- /*
- * 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 ((addr >= kernel_start && addr < kernel_end) ||
- (addr >= module_start && addr < module_end)) {
- printk(" [<%08lx>]", addr);
- if (++i > 40) {
- printk(" ...");
- break;
- }
- }
- }
- }
- void show_code(unsigned int *pc)
- {
- long i;
- printk("nCode:");
- for(i = -3 ; i < 6 ; i++) {
- unsigned long insn;
- if (__get_user(insn, pc + i)) {
- printk(" (Bad address in epc)n");
- break;
- }
- printk("%c%08lx%c",(i?' ':'<'),insn,(i?' ':'>'));
- }
- }
- spinlock_t die_lock;
- extern void __die(const char * str, struct pt_regs * regs, const char *where,
- unsigned long line)
- {
- console_verbose();
- spin_lock_irq(&die_lock);
- printk("%s", str);
- if (where)
- printk(" in %s, line %ld", where, line);
- printk(":n");
- show_regs(regs);
- printk("Process %s (pid: %d, stackpage=%08lx)n",
- current->comm, current->pid, (unsigned long) current);
- show_stack((unsigned int *) regs->regs[29]);
- show_trace((unsigned int *) regs->regs[29]);
- show_code((unsigned int *) regs->cp0_epc);
- printk("n");
- spin_unlock_irq(&die_lock);
- do_exit(SIGSEGV);
- }
- void __die_if_kernel(const char * str, struct pt_regs * regs, const char *where,
- unsigned long line)
- {
- if (!user_mode(regs))
- __die(str, regs, where, line);
- }
- extern const struct exception_table_entry __start___dbe_table[];
- extern const struct exception_table_entry __stop___dbe_table[];
- void __declare_dbe_table(void)
- {
- __asm__ __volatile__(
- ".sectiont__dbe_table,"a"nt"
- ".previous"
- );
- }
- static inline unsigned long
- search_one_table(const struct exception_table_entry *first,
- const struct exception_table_entry *last,
- unsigned long value)
- {
- const struct exception_table_entry *mid;
- long diff;
- while (first < last) {
- mid = (last - first) / 2 + first;
- diff = mid->insn - value;
- if (diff < 0)
- first = mid + 1;
- else
- last = mid;
- }
- return (first == last && first->insn == value) ? first->nextinsn : 0;
- }
- extern spinlock_t modlist_lock;
- static inline unsigned long
- search_dbe_table(unsigned long addr)
- {
- unsigned long ret = 0;
- #ifndef CONFIG_MODULES
- /* There is only the kernel to search. */
- ret = search_one_table(__start___dbe_table, __stop___dbe_table-1, addr);
- return ret;
- #else
- unsigned long flags;
- /* The kernel is the last "module" -- no need to treat it special. */
- struct module *mp;
- struct archdata *ap;
- spin_lock_irqsave(&modlist_lock, flags);
- for (mp = module_list; mp != NULL; mp = mp->next) {
- if (!mod_member_present(mp, archdata_end) ||
- !mod_archdata_member_present(mp, struct archdata,
- dbe_table_end))
- continue;
- ap = (struct archdata *)(mp->archdata_start);
- if (ap->dbe_table_start == NULL ||
- !(mp->flags & (MOD_RUNNING | MOD_INITIALIZING)))
- continue;
- ret = search_one_table(ap->dbe_table_start,
- ap->dbe_table_end - 1, addr);
- if (ret)
- break;
- }
- spin_unlock_irqrestore(&modlist_lock, flags);
- return ret;
- #endif
- }
- static void default_be_board_handler(struct pt_regs *regs)
- {
- unsigned long new_epc;
- unsigned long fixup;
- int data = regs->cp0_cause & 4;
- if (data && !user_mode(regs)) {
- fixup = search_dbe_table(regs->cp0_epc);
- if (fixup) {
- new_epc = fixup_exception(dpf_reg, fixup,
- regs->cp0_epc);
- regs->cp0_epc = new_epc;
- return;
- }
- }
- /*
- * Assume it would be too dangerous to continue ...
- */
- printk(KERN_ALERT "%s bus error, epc == %08lx, ra == %08lxn",
- data ? "Data" : "Instruction",
- regs->cp0_epc, regs->regs[31]);
- die_if_kernel("Oops", regs);
- force_sig(SIGBUS, current);
- }
- asmlinkage void do_ibe(struct pt_regs *regs)
- {
- ibe_board_handler(regs);
- }
- asmlinkage void do_dbe(struct pt_regs *regs)
- {
- dbe_board_handler(regs);
- }
- asmlinkage void do_ov(struct pt_regs *regs)
- {
- if (compute_return_epc(regs))
- return;
- force_sig(SIGFPE, current);
- }
- /*
- * XXX Delayed fp exceptions when doing a lazy ctx switch XXX
- */
- asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
- {
- if (fcr31 & FPU_CSR_UNI_X) {
- extern void save_fp(struct task_struct *);
- extern void restore_fp(struct task_struct *);
- int sig;
- /*
- * Unimplemented operation exception. If we've got the
- * full software emulator on-board, let's use it...
- *
- * Force FPU to dump state into task/thread context.
- * We're moving a lot of data here for what is probably
- * a single instruction, but the alternative is to
- * pre-decode the FP register operands before invoking
- * the emulator, which seems a bit extreme for what
- * should be an infrequent event.
- */
- save_fp(current);
-
- /* Run the emulator */
- sig = fpu_emulator_cop1Handler(regs);
- /*
- * We can't allow the emulated instruction to leave the
- * Unimplemented Operation bit set in $fcr31.
- */
- current->thread.fpu.soft.sr &= ~FPU_CSR_UNI_X;
- /* Restore the hardware register state */
- restore_fp(current);
- /* If something went wrong, signal */
- if (sig)
- force_sig(sig, current);
- return;
- }
- if (compute_return_epc(regs))
- return;
- force_sig(SIGFPE, current);
- printk(KERN_DEBUG "Sent send SIGFPE to %sn", current->comm);
- }
- static inline int get_insn_opcode(struct pt_regs *regs, unsigned int *opcode)
- {
- unsigned int *epc;
- epc = (unsigned int *) regs->cp0_epc +
- ((regs->cp0_cause & CAUSEF_BD) != 0);
- if (!get_user(*opcode, epc))
- return 0;
- force_sig(SIGSEGV, current);
- return 1;
- }
- asmlinkage void do_bp(struct pt_regs *regs)
- {
- siginfo_t info;
- unsigned int opcode, bcode;
- unsigned int *epc;
- epc = (unsigned int *) regs->cp0_epc +
- ((regs->cp0_cause & CAUSEF_BD) != 0);
- if (get_user(opcode, epc))
- goto sigsegv;
- /*
- * There is the ancient bug in the MIPS assemblers that the break
- * code starts left to bit 16 instead to bit 6 in the opcode.
- * Gas is bug-compatible ...
- */
- bcode = ((opcode >> 16) & ((1 << 20) - 1));
- /*
- * (A short test says that IRIX 5.3 sends SIGTRAP for all break
- * insns, even for break codes that indicate arithmetic failures.
- * Weird ...)
- * But should we continue the brokenness??? --macro
- */
- switch (bcode) {
- case 6:
- case 7:
- if (bcode == 7)
- info.si_code = FPE_INTDIV;
- else
- info.si_code = FPE_INTOVF;
- info.si_signo = SIGFPE;
- info.si_errno = 0;
- info.si_addr = (void *)compute_return_epc(regs);
- force_sig_info(SIGFPE, &info, current);
- break;
- default:
- force_sig(SIGTRAP, current);
- }
- return;
- sigsegv:
- force_sig(SIGSEGV, current);
- }
- asmlinkage void do_tr(struct pt_regs *regs)
- {
- siginfo_t info;
- unsigned int opcode, bcode;
- unsigned *epc;
- epc = (unsigned int *) regs->cp0_epc +
- ((regs->cp0_cause & CAUSEF_BD) != 0);
- if (get_user(opcode, epc))
- goto sigsegv;
- bcode = ((opcode >> 6) & ((1 << 20) - 1));
- /*
- * (A short test says that IRIX 5.3 sends SIGTRAP for all break
- * insns, even for break codes that indicate arithmetic failures.
- * Weird ...)
- * But should we continue the brokenness??? --macro
- */
- switch (bcode) {
- case 6:
- case 7:
- if (bcode == 7)
- info.si_code = FPE_INTDIV;
- else
- info.si_code = FPE_INTOVF;
- info.si_signo = SIGFPE;
- info.si_errno = 0;
- info.si_addr = (void *)compute_return_epc(regs);
- force_sig_info(SIGFPE, &info, current);
- break;
- default:
- force_sig(SIGTRAP, current);
- }
- return;
- sigsegv:
- force_sig(SIGSEGV, current);
- }
- #ifndef CONFIG_CPU_HAS_LLSC
- #ifdef CONFIG_SMP
- #error "ll/sc emulation is not SMP safe"
- #endif
- /*
- * userland emulation for R2300 CPUs
- * needed for the multithreading part of glibc
- *
- * this implementation can handle only sychronization between 2 or more
- * user contexts and is not SMP safe.
- */
- asmlinkage void do_ri(struct pt_regs *regs)
- {
- unsigned int opcode;
- if (!user_mode(regs))
- BUG();
- if (!get_insn_opcode(regs, &opcode)) {
- if ((opcode & OPCODE) == LL) {
- simulate_ll(regs, opcode);
- return;
- }
- if ((opcode & OPCODE) == SC) {
- simulate_sc(regs, opcode);
- return;
- }
- }
- if (compute_return_epc(regs))
- return;
- force_sig(SIGILL, current);
- }
- /*
- * The ll_bit is cleared by r*_switch.S
- */
- unsigned long ll_bit;
- #ifdef CONFIG_PROC_FS
- extern unsigned long ll_ops;
- extern unsigned long sc_ops;
- #endif
- static struct task_struct *ll_task = NULL;
- void simulate_ll(struct pt_regs *regp, unsigned int opcode)
- {
- unsigned long value, *vaddr;
- long offset;
- int signal = 0;
- /*
- * analyse the ll instruction that just caused a ri exception
- * and put the referenced address to addr.
- */
- /* sign extend offset */
- offset = opcode & OFFSET;
- offset <<= 16;
- offset >>= 16;
- vaddr = (unsigned long *)((long)(regp->regs[(opcode & BASE) >> 21]) + offset);
- #ifdef CONFIG_PROC_FS
- ll_ops++;
- #endif
- if ((unsigned long)vaddr & 3)
- signal = SIGBUS;
- else if (get_user(value, vaddr))
- signal = SIGSEGV;
- else {
- if (ll_task == NULL || ll_task == current) {
- ll_bit = 1;
- } else {
- ll_bit = 0;
- }
- ll_task = current;
- regp->regs[(opcode & RT) >> 16] = value;
- }
- if (compute_return_epc(regp))
- return;
- if (signal)
- send_sig(signal, current, 1);
- }
- void simulate_sc(struct pt_regs *regp, unsigned int opcode)
- {
- unsigned long *vaddr, reg;
- long offset;
- int signal = 0;
- /*
- * analyse the sc instruction that just caused a ri exception
- * and put the referenced address to addr.
- */
- /* sign extend offset */
- offset = opcode & OFFSET;
- offset <<= 16;
- offset >>= 16;
- vaddr = (unsigned long *)((long)(regp->regs[(opcode & BASE) >> 21]) + offset);
- reg = (opcode & RT) >> 16;
- #ifdef CONFIG_PROC_FS
- sc_ops++;
- #endif
- if ((unsigned long)vaddr & 3)
- signal = SIGBUS;
- else if (ll_bit == 0 || ll_task != current)
- regp->regs[reg] = 0;
- else if (put_user(regp->regs[reg], vaddr))
- signal = SIGSEGV;
- else
- regp->regs[reg] = 1;
- if (compute_return_epc(regp))
- return;
- if (signal)
- send_sig(signal, current, 1);
- }
- #else /* MIPS 2 or higher */
- asmlinkage void do_ri(struct pt_regs *regs)
- {
- unsigned int opcode;
- get_insn_opcode(regs, &opcode);
- if (compute_return_epc(regs))
- return;
- force_sig(SIGILL, current);
- }
- #endif
- asmlinkage void do_cpu(struct pt_regs *regs)
- {
- unsigned int cpid;
- extern void lazy_fpu_switch(void *);
- extern void init_fpu(void);
- void fpu_emulator_init_fpu(void);
- int sig;
- cpid = (regs->cp0_cause >> CAUSEB_CE) & 3;
- if (cpid != 1)
- goto bad_cid;
- if (!(mips_cpu.options & MIPS_CPU_FPU))
- goto fp_emul;
- regs->cp0_status |= ST0_CU1;
- if (last_task_used_math == current)
- return;
- if (current->used_math) { /* Using the FPU again. */
- lazy_fpu_switch(last_task_used_math);
- } else { /* First time FPU user. */
- init_fpu();
- current->used_math = 1;
- }
- last_task_used_math = current;
- return;
- fp_emul:
- if (last_task_used_math != current) {
- if (!current->used_math) {
- fpu_emulator_init_fpu();
- current->used_math = 1;
- }
- }
- sig = fpu_emulator_cop1Handler(regs);
- last_task_used_math = current;
- if (sig)
- force_sig(sig, current);
- return;
- bad_cid:
- force_sig(SIGILL, current);
- }
- asmlinkage void do_watch(struct pt_regs *regs)
- {
- /*
- * We use the watch exception where available to detect stack
- * overflows.
- */
- show_regs(regs);
- panic("Caught WATCH exception - probably caused by stack overflow.");
- }
- asmlinkage void do_mcheck(struct pt_regs *regs)
- {
- show_regs(regs);
- panic("Caught Machine Check exception - probably caused by multiple "
- "matching entries in the TLB.");
- }
- asmlinkage void do_reserved(struct pt_regs *regs)
- {
- /*
- * Game over - no way to handle this if it ever occurs. Most probably
- * caused by a new unknown cpu type or after another deadly
- * hard/software error.
- */
- show_regs(regs);
- panic("Caught reserved exception - should not happen.");
- }
- static inline void watch_init(void)
- {
- if (mips_cpu.options & MIPS_CPU_WATCH ) {
- set_except_vector(23, handle_watch);
- watch_available = 1;
- }
- }
- /*
- * Some MIPS CPUs can enable/disable for cache parity detection, but do
- * it different ways.
- */
- static inline void parity_protection_init(void)
- {
- switch (mips_cpu.cputype) {
- case CPU_5KC:
- /* Set the PE bit (bit 31) in the CP0_ECC register. */
- printk(KERN_INFO "Enable the cache parity protection for "
- "MIPS 5KC CPUs.n");
- write_32bit_cp0_register(CP0_ECC,
- read_32bit_cp0_register(CP0_ECC)
- | 0x80000000);
- break;
- default:
- break;
- }
- }
- asmlinkage void cache_parity_error(void)
- {
- unsigned int reg_val;
- /* For the moment, report the problem and hang. */
- reg_val = read_32bit_cp0_register(CP0_ERROREPC);
- printk("Cache error exception:n");
- printk("cp0_errorepc == %08xn", reg_val);
- reg_val = read_32bit_cp0_register(CP0_CACHEERR);
- printk("cp0_cacheerr == %08xn", reg_val);
- printk("Decoded CP0_CACHEERR: %s cache fault in %s reference.n",
- reg_val & (1<<30) ? "secondary" : "primary",
- reg_val & (1<<31) ? "data" : "insn");
- printk("Error bits: %s%s%s%s%s%s%sn",
- reg_val & (1<<29) ? "ED " : "",
- reg_val & (1<<28) ? "ET " : "",
- reg_val & (1<<26) ? "EE " : "",
- reg_val & (1<<25) ? "EB " : "",
- reg_val & (1<<24) ? "EI " : "",
- reg_val & (1<<23) ? "E1 " : "",
- reg_val & (1<<22) ? "E0 " : "");
- printk("IDX: 0x%08xn", reg_val & ((1<<22)-1));
- if (reg_val&(1<<22))
- printk("DErrAddr0: 0x%08xn",
- read_32bit_cp0_set1_register(CP0_S1_DERRADDR0));
- if (reg_val&(1<<23))
- printk("DErrAddr1: 0x%08xn",
- read_32bit_cp0_set1_register(CP0_S1_DERRADDR1));
- panic("Can't handle the cache error!");
- }
- unsigned long exception_handlers[32];
- /*
- * As a side effect of the way this is implemented we're limited
- * to interrupt handlers in the address range from
- * KSEG0 <= x < KSEG0 + 256mb on the Nevada. Oh well ...
- */
- void *set_except_vector(int n, void *addr)
- {
- unsigned handler = (unsigned long) addr;
- unsigned old_handler = exception_handlers[n];
- exception_handlers[n] = handler;
- if (n == 0 && mips_cpu.options & MIPS_CPU_DIVEC) {
- *(volatile u32 *)(KSEG0+0x200) = 0x08000000 |
- (0x03ffffff & (handler >> 2));
- flush_icache_range(KSEG0+0x200, KSEG0 + 0x204);
- }
- return (void *)old_handler;
- }
- asmlinkage int (*save_fp_context)(struct sigcontext *sc);
- asmlinkage int (*restore_fp_context)(struct sigcontext *sc);
- extern asmlinkage int _save_fp_context(struct sigcontext *sc);
- extern asmlinkage int _restore_fp_context(struct sigcontext *sc);
- extern asmlinkage int fpu_emulator_save_context(struct sigcontext *sc);
- extern asmlinkage int fpu_emulator_restore_context(struct sigcontext *sc);
- void __init trap_init(void)
- {
- extern char except_vec0_nevada, except_vec0_r4000;
- extern char except_vec0_r4600, except_vec0_r2300;
- extern char except_vec1_generic, except_vec2_generic;
- extern char except_vec3_generic, except_vec3_r4000;
- extern char except_vec4;
- extern char except_vec_ejtag_debug;
- unsigned long i;
- /* Some firmware leaves the BEV flag set, clear it. */
- clear_cp0_status(ST0_BEV);
- /* Copy the generic exception handler code to it's final destination. */
- memcpy((void *)(KSEG0 + 0x80), &except_vec1_generic, 0x80);
- memcpy((void *)(KSEG0 + 0x100), &except_vec2_generic, 0x80);
- memcpy((void *)(KSEG0 + 0x180), &except_vec3_generic, 0x80);
- flush_icache_range(KSEG0 + 0x80, KSEG0 + 0x200);
- /*
- * Setup default vectors
- */
- for (i = 0; i <= 31; i++)
- set_except_vector(i, handle_reserved);
- /*
- * Copy the EJTAG debug exception vector handler code to it's final
- * destination.
- */
- memcpy((void *)(KSEG0 + 0x300), &except_vec_ejtag_debug, 0x80);
- /*
- * Only some CPUs have the watch exceptions or a dedicated
- * interrupt vector.
- */
- watch_init();
- /*
- * Some MIPS CPUs have a dedicated interrupt vector which reduces the
- * interrupt processing overhead. Use it where available.
- */
- if (mips_cpu.options & MIPS_CPU_DIVEC) {
- memcpy((void *)(KSEG0 + 0x200), &except_vec4, 8);
- set_cp0_cause(CAUSEF_IV);
- }
- /*
- * Some CPUs can enable/disable for cache parity detection, but does
- * it different ways.
- */
- parity_protection_init();
- set_except_vector(1, handle_mod);
- set_except_vector(2, handle_tlbl);
- set_except_vector(3, handle_tlbs);
- set_except_vector(4, handle_adel);
- set_except_vector(5, handle_ades);
- /*
- * The Data Bus Error/ Instruction Bus Errors are signaled
- * by external hardware. Therefore these two expection have
- * board specific handlers.
- */
- set_except_vector(6, handle_ibe);
- set_except_vector(7, handle_dbe);
- ibe_board_handler = default_be_board_handler;
- dbe_board_handler = default_be_board_handler;
- set_except_vector(8, handle_sys);
- set_except_vector(9, handle_bp);
- set_except_vector(10, handle_ri);
- set_except_vector(11, handle_cpu);
- set_except_vector(12, handle_ov);
- set_except_vector(13, handle_tr);
- if (mips_cpu.options & MIPS_CPU_FPU)
- set_except_vector(15, handle_fpe);
- /*
- * Handling the following exceptions depends mostly of the cpu type
- */
- if ((mips_cpu.options & MIPS_CPU_4KEX)
- && (mips_cpu.options & MIPS_CPU_4KTLB)) {
- if (mips_cpu.cputype == CPU_NEVADA) {
- memcpy((void *)KSEG0, &except_vec0_nevada, 0x80);
- } else if (mips_cpu.cputype == CPU_R4600)
- memcpy((void *)KSEG0, &except_vec0_r4600, 0x80);
- else
- memcpy((void *)KSEG0, &except_vec0_r4000, 0x80);
- /* Cache error vector already set above. */
- if (mips_cpu.options & MIPS_CPU_VCE) {
- memcpy((void *)(KSEG0 + 0x180), &except_vec3_r4000,
- 0x80);
- } else {
- memcpy((void *)(KSEG0 + 0x180), &except_vec3_generic,
- 0x80);
- }
- if (mips_cpu.options & MIPS_CPU_FPU) {
- save_fp_context = _save_fp_context;
- restore_fp_context = _restore_fp_context;
- } else {
- save_fp_context = fpu_emulator_save_context;
- restore_fp_context = fpu_emulator_restore_context;
- }
- } else switch (mips_cpu.cputype) {
- case CPU_SB1:
- /*
- * XXX - This should be folded in to the "cleaner" handling,
- * above
- */
- memcpy((void *)KSEG0, &except_vec0_r4000, 0x80);
- memcpy((void *)(KSEG0 + 0x180), &except_vec3_r4000, 0x80);
- save_fp_context = _save_fp_context;
- restore_fp_context = _restore_fp_context;
- /* Enable timer interrupt and scd mapped interrupt */
- clear_cp0_status(0xf000);
- set_cp0_status(0xc00);
- break;
- case CPU_R6000:
- case CPU_R6000A:
- save_fp_context = _save_fp_context;
- restore_fp_context = _restore_fp_context;
-
- /*
- * The R6000 is the only R-series CPU that features a machine
- * check exception (similar to the R4000 cache error) and
- * unaligned ldc1/sdc1 exception. The handlers have not been
- * written yet. Well, anyway there is no R6000 machine on the
- * current list of targets for Linux/MIPS.
- * (Duh, crap, there is someone with a tripple R6k machine)
- */
- //set_except_vector(14, handle_mc);
- //set_except_vector(15, handle_ndc);
- case CPU_R2000:
- case CPU_R3000:
- case CPU_R3000A:
- case CPU_R3041:
- case CPU_R3051:
- case CPU_R3052:
- case CPU_R3081:
- case CPU_R3081E:
- case CPU_TX3912:
- case CPU_TX3922:
- case CPU_TX3927:
- save_fp_context = _save_fp_context;
- restore_fp_context = _restore_fp_context;
- memcpy((void *)KSEG0, &except_vec0_r2300, 0x80);
- memcpy((void *)(KSEG0 + 0x80), &except_vec3_generic, 0x80);
- break;
- case CPU_UNKNOWN:
- default:
- panic("Unknown CPU type");
- }
- flush_icache_range(KSEG0, KSEG0 + 0x200);
- if (mips_cpu.isa_level == MIPS_CPU_ISA_IV)
- set_cp0_status(ST0_XX);
- atomic_inc(&init_mm.mm_count); /* XXX UP? */
- current->active_mm = &init_mm;
- write_32bit_cp0_register(CP0_CONTEXT, smp_processor_id()<<23);
- current_pgd[0] = init_mm.pgd;
- }