* 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.
- * Copyright (C) 2002, 2003, 2004, 2005 Maciej W. Rozycki
+ * Copyright (C) 2002, 2003, 2004, 2005, 2007 Maciej W. Rozycki
*/
+#include <linux/bug.h>
+#include <linux/compiler.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 <linux/kallsyms.h>
#include <linux/bootmem.h>
#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/kgdb.h>
+#include <linux/kdebug.h>
#include <asm/bootinfo.h>
#include <asm/branch.h>
#include <asm/traps.h>
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
-#include <asm/watch.h>
#include <asm/types.h>
#include <asm/stacktrace.h>
+extern void check_wait(void);
+extern asmlinkage void r4k_wait(void);
+extern asmlinkage void rollback_handle_int(void);
extern asmlinkage void handle_int(void);
extern asmlinkage void handle_tlbm(void);
extern asmlinkage void handle_tlbl(void);
extern asmlinkage void handle_sys(void);
extern asmlinkage void handle_bp(void);
extern asmlinkage void handle_ri(void);
+extern asmlinkage void handle_ri_rdhwr_vivt(void);
+extern asmlinkage void handle_ri_rdhwr(void);
extern asmlinkage void handle_cpu(void);
extern asmlinkage void handle_ov(void);
extern asmlinkage void handle_tr(void);
extern asmlinkage void handle_reserved(void);
extern int fpu_emulator_cop1Handler(struct pt_regs *xcp,
- struct mips_fpu_struct *ctx);
+ struct mips_fpu_struct *ctx, int has_fpu);
void (*board_be_init)(void);
int (*board_be_handler)(struct pt_regs *regs, int is_fixup);
static void show_raw_backtrace(unsigned long reg29)
{
- unsigned long *sp = (unsigned long *)reg29;
+ unsigned long *sp = (unsigned long *)(reg29 & ~3);
unsigned long addr;
printk("Call Trace:");
printk("\n");
#endif
while (!kstack_end(sp)) {
- addr = *sp++;
+ unsigned long __user *p =
+ (unsigned long __user *)(unsigned long)sp++;
+ if (__get_user(addr, p)) {
+ printk(" (Bad stack address)");
+ break;
+ }
if (__kernel_text_address(addr))
print_ip_sym(addr);
}
__setup("raw_show_trace", set_raw_show_trace);
#endif
-static void show_backtrace(struct task_struct *task, struct pt_regs *regs)
+static void show_backtrace(struct task_struct *task, const struct pt_regs *regs)
{
unsigned long sp = regs->regs[29];
unsigned long ra = regs->regs[31];
* This routine abuses get_user()/put_user() to reference pointers
* with at least a bit of error checking ...
*/
-static void show_stacktrace(struct task_struct *task, struct pt_regs *regs)
+static void show_stacktrace(struct task_struct *task,
+ const struct pt_regs *regs)
{
const int field = 2 * sizeof(unsigned long);
long stackdata;
int i;
- unsigned long *sp = (unsigned long *)regs->regs[29];
+ unsigned long __user *sp = (unsigned long __user *)regs->regs[29];
printk("Stack :");
i = 0;
EXPORT_SYMBOL(dump_stack);
-void show_code(unsigned int *pc)
+static void show_code(unsigned int __user *pc)
{
long i;
+ unsigned short __user *pc16 = NULL;
printk("\nCode:");
+ if ((unsigned long)pc & 1)
+ pc16 = (unsigned short __user *)((unsigned long)pc & ~1);
for(i = -3 ; i < 6 ; i++) {
unsigned int insn;
- if (__get_user(insn, pc + i)) {
+ if (pc16 ? __get_user(insn, pc16 + i) : __get_user(insn, pc + i)) {
printk(" (Bad address in epc)\n");
break;
}
- printk("%c%08x%c", (i?' ':'<'), insn, (i?' ':'>'));
+ printk("%c%0*x%c", (i?' ':'<'), pc16 ? 4 : 8, insn, (i?' ':'>'));
}
}
-void show_regs(struct pt_regs *regs)
+static void __show_regs(const struct pt_regs *regs)
{
const int field = 2 * sizeof(unsigned long);
unsigned int cause = regs->cp0_cause;
printk("\n");
}
+#ifdef CONFIG_CPU_HAS_SMARTMIPS
+ printk("Acx : %0*lx\n", field, regs->acx);
+#endif
printk("Hi : %0*lx\n", field, regs->hi);
printk("Lo : %0*lx\n", field, regs->lo);
/*
* Saved cp0 registers
*/
- printk("epc : %0*lx ", field, regs->cp0_epc);
- print_symbol("%s ", regs->cp0_epc);
+ printk("epc : %0*lx %pS\n", field, regs->cp0_epc,
+ (void *) regs->cp0_epc);
printk(" %s\n", print_tainted());
- printk("ra : %0*lx ", field, regs->regs[31]);
- print_symbol("%s\n", regs->regs[31]);
+ printk("ra : %0*lx %pS\n", field, regs->regs[31],
+ (void *) regs->regs[31]);
printk("Status: %08x ", (uint32_t) regs->cp0_status);
if (1 <= cause && cause <= 5)
printk("BadVA : %0*lx\n", field, regs->cp0_badvaddr);
- printk("PrId : %08x\n", read_c0_prid());
+ printk("PrId : %08x (%s)\n", read_c0_prid(),
+ cpu_name_string());
}
-void show_registers(struct pt_regs *regs)
+/*
+ * FIXME: really the generic show_regs should take a const pointer argument.
+ */
+void show_regs(struct pt_regs *regs)
{
- show_regs(regs);
+ __show_regs((struct pt_regs *)regs);
+}
+
+void show_registers(const struct pt_regs *regs)
+{
+ const int field = 2 * sizeof(unsigned long);
+
+ __show_regs(regs);
print_modules();
- printk("Process %s (pid: %d, threadinfo=%p, task=%p)\n",
- current->comm, current->pid, current_thread_info(), current);
+ printk("Process %s (pid: %d, threadinfo=%p, task=%p, tls=%0*lx)\n",
+ current->comm, current->pid, current_thread_info(), current,
+ field, current_thread_info()->tp_value);
+ if (cpu_has_userlocal) {
+ unsigned long tls;
+
+ tls = read_c0_userlocal();
+ if (tls != current_thread_info()->tp_value)
+ printk("*HwTLS: %0*lx\n", field, tls);
+ }
+
show_stacktrace(current, regs);
- show_code((unsigned int *) regs->cp0_epc);
+ show_code((unsigned int __user *) regs->cp0_epc);
printk("\n");
}
static DEFINE_SPINLOCK(die_lock);
-NORET_TYPE void ATTRIB_NORET die(const char * str, struct pt_regs * regs)
+void __noreturn die(const char * str, const struct pt_regs * regs)
{
static int die_counter;
#ifdef CONFIG_MIPS_MT_SMTC
#endif /* CONFIG_MIPS_MT_SMTC */
printk("%s[#%d]:\n", str, ++die_counter);
show_registers(regs);
+ add_taint(TAINT_DIE);
spin_unlock_irq(&die_lock);
if (in_interrupt())
do_exit(SIGSEGV);
}
-extern const struct exception_table_entry __start___dbe_table[];
-extern const struct exception_table_entry __stop___dbe_table[];
+extern struct exception_table_entry __start___dbe_table[];
+extern struct exception_table_entry __stop___dbe_table[];
-void __declare_dbe_table(void)
-{
- __asm__ __volatile__(
- ".section\t__dbe_table,\"a\"\n\t"
- ".previous"
- );
-}
+__asm__(
+" .section __dbe_table, \"a\"\n"
+" .previous \n");
/* Given an address, look for it in the exception tables. */
static const struct exception_table_entry *search_dbe_tables(unsigned long addr)
action = MIPS_BE_FIXUP;
if (board_be_handler)
- action = board_be_handler(regs, fixup != 0);
+ action = board_be_handler(regs, fixup != NULL);
switch (action) {
case MIPS_BE_DISCARD:
printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n",
data ? "Data" : "Instruction",
field, regs->cp0_epc, field, regs->regs[31]);
+ if (notify_die(DIE_OOPS, "bus error", regs, SIGBUS, 0, 0)
+ == NOTIFY_STOP)
+ return;
+
die_if_kernel("Oops", regs);
force_sig(SIGBUS, current);
}
-static inline int get_insn_opcode(struct pt_regs *regs, unsigned int *opcode)
-{
- unsigned int __user *epc;
-
- epc = (unsigned int __user *) regs->cp0_epc +
- ((regs->cp0_cause & CAUSEF_BD) != 0);
- if (!get_user(*opcode, epc))
- return 0;
-
- force_sig(SIGSEGV, current);
- return 1;
-}
-
/*
- * ll/sc emulation
+ * ll/sc, rdhwr, sync emulation
*/
#define OPCODE 0xfc000000
#define OFFSET 0x0000ffff
#define LL 0xc0000000
#define SC 0xe0000000
+#define SPEC0 0x00000000
#define SPEC3 0x7c000000
#define RD 0x0000f800
#define FUNC 0x0000003f
+#define SYNC 0x0000000f
#define RDHWR 0x0000003b
/*
static struct task_struct *ll_task = NULL;
-static inline void simulate_ll(struct pt_regs *regs, unsigned int opcode)
+static inline int simulate_ll(struct pt_regs *regs, unsigned int opcode)
{
unsigned long value, __user *vaddr;
long offset;
- int signal = 0;
/*
* analyse the ll instruction that just caused a ri exception
vaddr = (unsigned long __user *)
((unsigned long)(regs->regs[(opcode & BASE) >> 21]) + offset);
- if ((unsigned long)vaddr & 3) {
- signal = SIGBUS;
- goto sig;
- }
- if (get_user(value, vaddr)) {
- signal = SIGSEGV;
- goto sig;
- }
+ if ((unsigned long)vaddr & 3)
+ return SIGBUS;
+ if (get_user(value, vaddr))
+ return SIGSEGV;
preempt_disable();
preempt_enable();
- compute_return_epc(regs);
-
regs->regs[(opcode & RT) >> 16] = value;
- return;
-
-sig:
- force_sig(signal, current);
+ return 0;
}
-static inline void simulate_sc(struct pt_regs *regs, unsigned int opcode)
+static inline int simulate_sc(struct pt_regs *regs, unsigned int opcode)
{
unsigned long __user *vaddr;
unsigned long reg;
long offset;
- int signal = 0;
/*
* analyse the sc instruction that just caused a ri exception
((unsigned long)(regs->regs[(opcode & BASE) >> 21]) + offset);
reg = (opcode & RT) >> 16;
- if ((unsigned long)vaddr & 3) {
- signal = SIGBUS;
- goto sig;
- }
+ if ((unsigned long)vaddr & 3)
+ return SIGBUS;
preempt_disable();
if (ll_bit == 0 || ll_task != current) {
- compute_return_epc(regs);
regs->regs[reg] = 0;
preempt_enable();
- return;
+ return 0;
}
preempt_enable();
- if (put_user(regs->regs[reg], vaddr)) {
- signal = SIGSEGV;
- goto sig;
- }
+ if (put_user(regs->regs[reg], vaddr))
+ return SIGSEGV;
- compute_return_epc(regs);
regs->regs[reg] = 1;
- return;
-
-sig:
- force_sig(signal, current);
+ return 0;
}
/*
* few processors such as NEC's VR4100 throw reserved instruction exceptions
* instead, so we're doing the emulation thing in both exception handlers.
*/
-static inline int simulate_llsc(struct pt_regs *regs)
+static int simulate_llsc(struct pt_regs *regs, unsigned int opcode)
{
- unsigned int opcode;
-
- if (unlikely(get_insn_opcode(regs, &opcode)))
- return -EFAULT;
+ if ((opcode & OPCODE) == LL)
+ return simulate_ll(regs, opcode);
+ if ((opcode & OPCODE) == SC)
+ return simulate_sc(regs, opcode);
- if ((opcode & OPCODE) == LL) {
- simulate_ll(regs, opcode);
- return 0;
- }
- if ((opcode & OPCODE) == SC) {
- simulate_sc(regs, opcode);
- return 0;
- }
-
- return -EFAULT; /* Strange things going on ... */
+ return -1; /* Must be something else ... */
}
/*
* Simulate trapping 'rdhwr' instructions to provide user accessible
- * registers not implemented in hardware. The only current use of this
- * is the thread area pointer.
+ * registers not implemented in hardware.
*/
-static inline int simulate_rdhwr(struct pt_regs *regs)
+static int simulate_rdhwr(struct pt_regs *regs, unsigned int opcode)
{
struct thread_info *ti = task_thread_info(current);
- unsigned int opcode;
-
- if (unlikely(get_insn_opcode(regs, &opcode)))
- return -EFAULT;
-
- if (unlikely(compute_return_epc(regs)))
- return -EFAULT;
if ((opcode & OPCODE) == SPEC3 && (opcode & FUNC) == RDHWR) {
int rd = (opcode & RD) >> 11;
int rt = (opcode & RT) >> 16;
switch (rd) {
- case 29:
- regs->regs[rt] = ti->tp_value;
- return 0;
+ case 0: /* CPU number */
+ regs->regs[rt] = smp_processor_id();
+ return 0;
+ case 1: /* SYNCI length */
+ regs->regs[rt] = min(current_cpu_data.dcache.linesz,
+ current_cpu_data.icache.linesz);
+ return 0;
+ case 2: /* Read count register */
+ regs->regs[rt] = read_c0_count();
+ return 0;
+ case 3: /* Count register resolution */
+ switch (current_cpu_data.cputype) {
+ case CPU_20KC:
+ case CPU_25KF:
+ regs->regs[rt] = 1;
+ break;
default:
- return -EFAULT;
+ regs->regs[rt] = 2;
+ }
+ return 0;
+ case 29:
+ regs->regs[rt] = ti->tp_value;
+ return 0;
+ default:
+ return -1;
}
}
/* Not ours. */
- return -EFAULT;
+ return -1;
+}
+
+static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
+{
+ if ((opcode & OPCODE) == SPEC0 && (opcode & FUNC) == SYNC)
+ return 0;
+
+ return -1; /* Must be something else ... */
}
asmlinkage void do_ov(struct pt_regs *regs)
*/
asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
{
+ siginfo_t info;
+
+ if (notify_die(DIE_FP, "FP exception", regs, SIGFPE, 0, 0)
+ == NOTIFY_STOP)
+ return;
die_if_kernel("FP exception in kernel code", regs);
if (fcr31 & FPU_CSR_UNI_X) {
int sig;
- preempt_disable();
-
-#ifdef CONFIG_PREEMPT
- if (!is_fpu_owner()) {
- /* We might lose fpu before disabling preempt... */
- own_fpu();
- BUG_ON(!used_math());
- restore_fp(current);
- }
-#endif
/*
* Unimplemented operation exception. If we've got the full
* software emulator on-board, let's use it...
* register operands before invoking the emulator, which seems
* a bit extreme for what should be an infrequent event.
*/
- save_fp(current);
/* Ensure 'resume' not overwrite saved fp context again. */
- lose_fpu();
-
- preempt_enable();
+ lose_fpu(1);
/* Run the emulator */
- sig = fpu_emulator_cop1Handler (regs, ¤t->thread.fpu);
-
- preempt_disable();
+ sig = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 1);
- own_fpu(); /* Using the FPU again. */
/*
* We can't allow the emulated instruction to leave any of
* the cause bit set in $fcr31.
current->thread.fpu.fcr31 &= ~FPU_CSR_ALL_X;
/* Restore the hardware register state */
- restore_fp(current);
-
- preempt_enable();
+ own_fpu(1); /* Using the FPU again. */
/* If something went wrong, signal */
if (sig)
force_sig(sig, current);
return;
- }
-
- force_sig(SIGFPE, current);
+ } else if (fcr31 & FPU_CSR_INV_X)
+ info.si_code = FPE_FLTINV;
+ else if (fcr31 & FPU_CSR_DIV_X)
+ info.si_code = FPE_FLTDIV;
+ else if (fcr31 & FPU_CSR_OVF_X)
+ info.si_code = FPE_FLTOVF;
+ else if (fcr31 & FPU_CSR_UDF_X)
+ info.si_code = FPE_FLTUND;
+ else if (fcr31 & FPU_CSR_INE_X)
+ info.si_code = FPE_FLTRES;
+ else
+ info.si_code = __SI_FAULT;
+ info.si_signo = SIGFPE;
+ info.si_errno = 0;
+ info.si_addr = (void __user *) regs->cp0_epc;
+ force_sig_info(SIGFPE, &info, current);
}
-asmlinkage void do_bp(struct pt_regs *regs)
+static void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
+ const char *str)
{
- unsigned int opcode, bcode;
siginfo_t info;
+ char b[40];
- die_if_kernel("Break instruction in kernel code", regs);
-
- if (get_insn_opcode(regs, &opcode))
+ if (notify_die(DIE_TRAP, str, regs, code, 0, 0) == NOTIFY_STOP)
return;
/*
- * 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, but not always, grrr...
- * We handle both cases with a simple heuristics. --macro
- */
- bcode = ((opcode >> 6) & ((1 << 20) - 1));
- if (bcode < (1 << 10))
- bcode <<= 10;
-
- /*
- * (A short test says that IRIX 5.3 sends SIGTRAP for all break
- * insns, even for break codes that indicate arithmetic failures.
- * Weird ...)
+ * A short test says that IRIX 5.3 sends SIGTRAP for all trap
+ * insns, even for trap and break codes that indicate arithmetic
+ * failures. Weird ...
* But should we continue the brokenness??? --macro
*/
- switch (bcode) {
- case BRK_OVERFLOW << 10:
- case BRK_DIVZERO << 10:
- if (bcode == (BRK_DIVZERO << 10))
+ switch (code) {
+ case BRK_OVERFLOW:
+ case BRK_DIVZERO:
+ scnprintf(b, sizeof(b), "%s instruction in kernel code", str);
+ die_if_kernel(b, regs);
+ if (code == BRK_DIVZERO)
info.si_code = FPE_INTDIV;
else
info.si_code = FPE_INTOVF;
info.si_addr = (void __user *) regs->cp0_epc;
force_sig_info(SIGFPE, &info, current);
break;
+ case BRK_BUG:
+ die_if_kernel("Kernel bug detected", regs);
+ force_sig(SIGTRAP, current);
+ break;
default:
+ scnprintf(b, sizeof(b), "%s instruction in kernel code", str);
+ die_if_kernel(b, regs);
force_sig(SIGTRAP, current);
}
}
+asmlinkage void do_bp(struct pt_regs *regs)
+{
+ unsigned int opcode, bcode;
+
+ if (__get_user(opcode, (unsigned int __user *) exception_epc(regs)))
+ goto out_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, but not always, grrr...
+ * We handle both cases with a simple heuristics. --macro
+ */
+ bcode = ((opcode >> 6) & ((1 << 20) - 1));
+ if (bcode >= (1 << 10))
+ bcode >>= 10;
+
+ do_trap_or_bp(regs, bcode, "Break");
+ return;
+
+out_sigsegv:
+ force_sig(SIGSEGV, current);
+}
+
asmlinkage void do_tr(struct pt_regs *regs)
{
unsigned int opcode, tcode = 0;
- siginfo_t info;
-
- die_if_kernel("Trap instruction in kernel code", regs);
- if (get_insn_opcode(regs, &opcode))
- return;
+ if (__get_user(opcode, (unsigned int __user *) exception_epc(regs)))
+ goto out_sigsegv;
/* Immediate versions don't provide a code. */
if (!(opcode & OPCODE))
tcode = ((opcode >> 6) & ((1 << 10) - 1));
- /*
- * (A short test says that IRIX 5.3 sends SIGTRAP for all trap
- * insns, even for trap codes that indicate arithmetic failures.
- * Weird ...)
- * But should we continue the brokenness??? --macro
- */
- switch (tcode) {
- case BRK_OVERFLOW:
- case BRK_DIVZERO:
- if (tcode == BRK_DIVZERO)
- info.si_code = FPE_INTDIV;
- else
- info.si_code = FPE_INTOVF;
- info.si_signo = SIGFPE;
- info.si_errno = 0;
- info.si_addr = (void __user *) regs->cp0_epc;
- force_sig_info(SIGFPE, &info, current);
- break;
- default:
- force_sig(SIGTRAP, current);
- }
+ do_trap_or_bp(regs, tcode, "Trap");
+ return;
+
+out_sigsegv:
+ force_sig(SIGSEGV, current);
}
asmlinkage void do_ri(struct pt_regs *regs)
{
- die_if_kernel("Reserved instruction in kernel code", regs);
+ unsigned int __user *epc = (unsigned int __user *)exception_epc(regs);
+ unsigned long old_epc = regs->cp0_epc;
+ unsigned int opcode = 0;
+ int status = -1;
- if (!cpu_has_llsc)
- if (!simulate_llsc(regs))
- return;
+ if (notify_die(DIE_RI, "RI Fault", regs, SIGSEGV, 0, 0)
+ == NOTIFY_STOP)
+ return;
+
+ die_if_kernel("Reserved instruction in kernel code", regs);
- if (!simulate_rdhwr(regs))
+ if (unlikely(compute_return_epc(regs) < 0))
return;
- force_sig(SIGILL, current);
+ if (unlikely(get_user(opcode, epc) < 0))
+ status = SIGSEGV;
+
+ if (!cpu_has_llsc && status < 0)
+ status = simulate_llsc(regs, opcode);
+
+ if (status < 0)
+ status = simulate_rdhwr(regs, opcode);
+
+ if (status < 0)
+ status = simulate_sync(regs, opcode);
+
+ if (status < 0)
+ status = SIGILL;
+
+ if (unlikely(status > 0)) {
+ regs->cp0_epc = old_epc; /* Undo skip-over. */
+ force_sig(status, current);
+ }
+}
+
+/*
+ * MIPS MT processors may have fewer FPU contexts than CPU threads. If we've
+ * emulated more than some threshold number of instructions, force migration to
+ * a "CPU" that has FP support.
+ */
+static void mt_ase_fp_affinity(void)
+{
+#ifdef CONFIG_MIPS_MT_FPAFF
+ if (mt_fpemul_threshold > 0 &&
+ ((current->thread.emulated_fp++ > mt_fpemul_threshold))) {
+ /*
+ * If there's no FPU present, or if the application has already
+ * restricted the allowed set to exclude any CPUs with FPUs,
+ * we'll skip the procedure.
+ */
+ if (cpus_intersects(current->cpus_allowed, mt_fpu_cpumask)) {
+ cpumask_t tmask;
+
+ current->thread.user_cpus_allowed
+ = current->cpus_allowed;
+ cpus_and(tmask, current->cpus_allowed,
+ mt_fpu_cpumask);
+ set_cpus_allowed(current, tmask);
+ set_thread_flag(TIF_FPUBOUND);
+ }
+ }
+#endif /* CONFIG_MIPS_MT_FPAFF */
}
asmlinkage void do_cpu(struct pt_regs *regs)
{
+ unsigned int __user *epc;
+ unsigned long old_epc;
+ unsigned int opcode;
unsigned int cpid;
+ int status;
die_if_kernel("do_cpu invoked from kernel context!", regs);
switch (cpid) {
case 0:
- if (!cpu_has_llsc)
- if (!simulate_llsc(regs))
- return;
+ epc = (unsigned int __user *)exception_epc(regs);
+ old_epc = regs->cp0_epc;
+ opcode = 0;
+ status = -1;
- if (!simulate_rdhwr(regs))
+ if (unlikely(compute_return_epc(regs) < 0))
return;
- break;
+ if (unlikely(get_user(opcode, epc) < 0))
+ status = SIGSEGV;
- case 1:
- preempt_disable();
+ if (!cpu_has_llsc && status < 0)
+ status = simulate_llsc(regs, opcode);
+
+ if (status < 0)
+ status = simulate_rdhwr(regs, opcode);
+
+ if (status < 0)
+ status = SIGILL;
+
+ if (unlikely(status > 0)) {
+ regs->cp0_epc = old_epc; /* Undo skip-over. */
+ force_sig(status, current);
+ }
+
+ return;
- own_fpu();
- if (used_math()) { /* Using the FPU again. */
- restore_fp(current);
- } else { /* First time FPU user. */
+ case 1:
+ if (used_math()) /* Using the FPU again. */
+ own_fpu(1);
+ else { /* First time FPU user. */
init_fpu();
set_used_math();
}
- preempt_enable();
-
- if (!cpu_has_fpu) {
- int sig = fpu_emulator_cop1Handler(regs,
- ¤t->thread.fpu);
+ if (!raw_cpu_has_fpu) {
+ int sig;
+ sig = fpu_emulator_cop1Handler(regs,
+ ¤t->thread.fpu, 0);
if (sig)
force_sig(sig, current);
-#ifdef CONFIG_MIPS_MT_FPAFF
- else {
- /*
- * MIPS MT processors may have fewer FPU contexts
- * than CPU threads. If we've emulated more than
- * some threshold number of instructions, force
- * migration to a "CPU" that has FP support.
- */
- if(mt_fpemul_threshold > 0
- && ((current->thread.emulated_fp++
- > mt_fpemul_threshold))) {
- /*
- * If there's no FPU present, or if the
- * application has already restricted
- * the allowed set to exclude any CPUs
- * with FPUs, we'll skip the procedure.
- */
- if (cpus_intersects(current->cpus_allowed,
- mt_fpu_cpumask)) {
- cpumask_t tmask;
-
- cpus_and(tmask,
- current->thread.user_cpus_allowed,
- mt_fpu_cpumask);
- set_cpus_allowed(current, tmask);
- current->thread.mflags |= MF_FPUBOUND;
- }
- }
- }
-#endif /* CONFIG_MIPS_MT_FPAFF */
+ else
+ mt_ase_fp_affinity();
}
return;
case 2:
case 3:
- die_if_kernel("do_cpu invoked from kernel context!", regs);
break;
}
dump_tlb_all();
}
- show_code((unsigned int *) regs->cp0_epc);
+ show_code((unsigned int __user *) regs->cp0_epc);
/*
* Some chips may have other causes of machine check (e.g. SB1
(regs->cp0_cause & 0x7f) >> 2);
}
-asmlinkage void do_default_vi(struct pt_regs *regs)
+static int __initdata l1parity = 1;
+static int __init nol1parity(char *s)
{
- show_regs(regs);
- panic("Caught unexpected vectored interrupt.");
+ l1parity = 0;
+ return 1;
+}
+__setup("nol1par", nol1parity);
+static int __initdata l2parity = 1;
+static int __init nol2parity(char *s)
+{
+ l2parity = 0;
+ return 1;
}
+__setup("nol2par", nol2parity);
/*
* Some MIPS CPUs can enable/disable for cache parity detection, but do
*/
static inline void parity_protection_init(void)
{
- switch (current_cpu_data.cputype) {
+ switch (current_cpu_type()) {
case CPU_24K:
case CPU_34K:
+ case CPU_74K:
+ case CPU_1004K:
+ {
+#define ERRCTL_PE 0x80000000
+#define ERRCTL_L2P 0x00800000
+ unsigned long errctl;
+ unsigned int l1parity_present, l2parity_present;
+
+ errctl = read_c0_ecc();
+ errctl &= ~(ERRCTL_PE|ERRCTL_L2P);
+
+ /* probe L1 parity support */
+ write_c0_ecc(errctl | ERRCTL_PE);
+ back_to_back_c0_hazard();
+ l1parity_present = (read_c0_ecc() & ERRCTL_PE);
+
+ /* probe L2 parity support */
+ write_c0_ecc(errctl|ERRCTL_L2P);
+ back_to_back_c0_hazard();
+ l2parity_present = (read_c0_ecc() & ERRCTL_L2P);
+
+ if (l1parity_present && l2parity_present) {
+ if (l1parity)
+ errctl |= ERRCTL_PE;
+ if (l1parity ^ l2parity)
+ errctl |= ERRCTL_L2P;
+ } else if (l1parity_present) {
+ if (l1parity)
+ errctl |= ERRCTL_PE;
+ } else if (l2parity_present) {
+ if (l2parity)
+ errctl |= ERRCTL_L2P;
+ } else {
+ /* No parity available */
+ }
+
+ printk(KERN_INFO "Writing ErrCtl register=%08lx\n", errctl);
+
+ write_c0_ecc(errctl);
+ back_to_back_c0_hazard();
+ errctl = read_c0_ecc();
+ printk(KERN_INFO "Readback ErrCtl register=%08lx\n", errctl);
+
+ if (l1parity_present)
+ printk(KERN_INFO "Cache parity protection %sabled\n",
+ (errctl & ERRCTL_PE) ? "en" : "dis");
+
+ if (l2parity_present) {
+ if (l1parity_present && l1parity)
+ errctl ^= ERRCTL_L2P;
+ printk(KERN_INFO "L2 cache parity protection %sabled\n",
+ (errctl & ERRCTL_L2P) ? "en" : "dis");
+ }
+ }
+ break;
+
case CPU_5KC:
write_c0_ecc(0x80000000);
back_to_back_c0_hazard();
/*
* NMI exception handler.
*/
-void nmi_exception_handler(struct pt_regs *regs)
+NORET_TYPE void ATTRIB_NORET nmi_exception_handler(struct pt_regs *regs)
{
-#ifdef CONFIG_MIPS_MT_SMTC
- unsigned long dvpret = dvpe();
- bust_spinlocks(1);
- printk("NMI taken!!!!\n");
- mips_mt_regdump(dvpret);
-#else
bust_spinlocks(1);
printk("NMI taken!!!!\n");
-#endif /* CONFIG_MIPS_MT_SMTC */
die("NMI", regs);
- while(1) ;
}
#define VECTORSPACING 0x100 /* for EI/VI mode */
exception_handlers[n] = handler;
if (n == 0 && cpu_has_divec) {
- *(volatile u32 *)(ebase + 0x200) = 0x08000000 |
- (0x03ffffff & (handler >> 2));
- flush_icache_range(ebase + 0x200, ebase + 0x204);
+ *(u32 *)(ebase + 0x200) = 0x08000000 |
+ (0x03ffffff & (handler >> 2));
+ local_flush_icache_range(ebase + 0x200, ebase + 0x204);
}
return (void *)old_handler;
}
-#ifdef CONFIG_CPU_MIPSR2_SRS
-/*
- * MIPSR2 shadow register set allocation
- * FIXME: SMP...
- */
-
-static struct shadow_registers {
- /*
- * Number of shadow register sets supported
- */
- unsigned long sr_supported;
- /*
- * Bitmap of allocated shadow registers
- */
- unsigned long sr_allocated;
-} shadow_registers;
-
-static void mips_srs_init(void)
-{
- shadow_registers.sr_supported = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
- printk(KERN_INFO "%d MIPSR2 register sets available\n",
- shadow_registers.sr_supported);
- shadow_registers.sr_allocated = 1; /* Set 0 used by kernel */
-}
-
-int mips_srs_max(void)
+static asmlinkage void do_default_vi(void)
{
- return shadow_registers.sr_supported;
-}
-
-int mips_srs_alloc(void)
-{
- struct shadow_registers *sr = &shadow_registers;
- int set;
-
-again:
- set = find_first_zero_bit(&sr->sr_allocated, sr->sr_supported);
- if (set >= sr->sr_supported)
- return -1;
-
- if (test_and_set_bit(set, &sr->sr_allocated))
- goto again;
-
- return set;
-}
-
-void mips_srs_free(int set)
-{
- struct shadow_registers *sr = &shadow_registers;
-
- clear_bit(set, &sr->sr_allocated);
+ show_regs(get_irq_regs());
+ panic("Caught unexpected vectored interrupt.");
}
-static void *set_vi_srs_handler(int n, void *addr, int srs)
+static void *set_vi_srs_handler(int n, vi_handler_t addr, int srs)
{
unsigned long handler;
unsigned long old_handler = vi_handlers[n];
+ int srssets = current_cpu_data.srsets;
u32 *w;
unsigned char *b;
b = (unsigned char *)(ebase + 0x200 + n*VECTORSPACING);
- if (srs >= mips_srs_max())
+ if (srs >= srssets)
panic("Shadow register set %d not supported", srs);
if (cpu_has_veic) {
if (board_bind_eic_interrupt)
- board_bind_eic_interrupt (n, srs);
+ board_bind_eic_interrupt(n, srs);
} else if (cpu_has_vint) {
/* SRSMap is only defined if shadow sets are implemented */
- if (mips_srs_max() > 1)
- change_c0_srsmap (0xf << n*4, srs << n*4);
+ if (srssets > 1)
+ change_c0_srsmap(0xf << n*4, srs << n*4);
}
if (srs == 0) {
extern char except_vec_vi, except_vec_vi_lui;
extern char except_vec_vi_ori, except_vec_vi_end;
+ extern char rollback_except_vec_vi;
+ char *vec_start = (cpu_wait == r4k_wait) ?
+ &rollback_except_vec_vi : &except_vec_vi;
#ifdef CONFIG_MIPS_MT_SMTC
/*
* We need to provide the SMTC vectored interrupt handler
* Status.IM bit to be masked before going there.
*/
extern char except_vec_vi_mori;
- const int mori_offset = &except_vec_vi_mori - &except_vec_vi;
+ const int mori_offset = &except_vec_vi_mori - vec_start;
#endif /* CONFIG_MIPS_MT_SMTC */
- const int handler_len = &except_vec_vi_end - &except_vec_vi;
- const int lui_offset = &except_vec_vi_lui - &except_vec_vi;
- const int ori_offset = &except_vec_vi_ori - &except_vec_vi;
+ const int handler_len = &except_vec_vi_end - vec_start;
+ const int lui_offset = &except_vec_vi_lui - vec_start;
+ const int ori_offset = &except_vec_vi_ori - vec_start;
if (handler_len > VECTORSPACING) {
/*
* Sigh... panicing won't help as the console
* is probably not configured :(
*/
- panic ("VECTORSPACING too small");
+ panic("VECTORSPACING too small");
}
- memcpy (b, &except_vec_vi, handler_len);
+ memcpy(b, vec_start, handler_len);
#ifdef CONFIG_MIPS_MT_SMTC
- if (n > 7)
- printk("Vector index %d exceeds SMTC maximum\n", n);
+ BUG_ON(n > 7); /* Vector index %d exceeds SMTC maximum. */
+
w = (u32 *)(b + mori_offset);
*w = (*w & 0xffff0000) | (0x100 << n);
#endif /* CONFIG_MIPS_MT_SMTC */
*w = (*w & 0xffff0000) | (((u32)handler >> 16) & 0xffff);
w = (u32 *)(b + ori_offset);
*w = (*w & 0xffff0000) | ((u32)handler & 0xffff);
- flush_icache_range((unsigned long)b, (unsigned long)(b+handler_len));
+ local_flush_icache_range((unsigned long)b,
+ (unsigned long)(b+handler_len));
}
else {
/*
w = (u32 *)b;
*w++ = 0x08000000 | (((u32)handler >> 2) & 0x03fffff); /* j handler */
*w = 0;
- flush_icache_range((unsigned long)b, (unsigned long)(b+8));
+ local_flush_icache_range((unsigned long)b,
+ (unsigned long)(b+8));
}
return (void *)old_handler;
}
-void *set_vi_handler(int n, void *addr)
+void *set_vi_handler(int n, vi_handler_t addr)
{
return set_vi_srs_handler(n, addr, 0);
}
-#else
-
-static inline void mips_srs_init(void)
-{
-}
-
-#endif /* CONFIG_CPU_MIPSR2_SRS */
-
/*
* This is used by native signal handling
*/
-asmlinkage int (*save_fp_context)(struct sigcontext *sc);
-asmlinkage int (*restore_fp_context)(struct sigcontext *sc);
+asmlinkage int (*save_fp_context)(struct sigcontext __user *sc);
+asmlinkage int (*restore_fp_context)(struct sigcontext __user *sc);
-extern asmlinkage int _save_fp_context(struct sigcontext *sc);
-extern asmlinkage int _restore_fp_context(struct sigcontext *sc);
+extern asmlinkage int _save_fp_context(struct sigcontext __user *sc);
+extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc);
-extern asmlinkage int fpu_emulator_save_context(struct sigcontext *sc);
-extern asmlinkage int fpu_emulator_restore_context(struct sigcontext *sc);
+extern asmlinkage int fpu_emulator_save_context(struct sigcontext __user *sc);
+extern asmlinkage int fpu_emulator_restore_context(struct sigcontext __user *sc);
#ifdef CONFIG_SMP
-static int smp_save_fp_context(struct sigcontext *sc)
+static int smp_save_fp_context(struct sigcontext __user *sc)
{
- return cpu_has_fpu
+ return raw_cpu_has_fpu
? _save_fp_context(sc)
: fpu_emulator_save_context(sc);
}
-static int smp_restore_fp_context(struct sigcontext *sc)
+static int smp_restore_fp_context(struct sigcontext __user *sc)
{
- return cpu_has_fpu
+ return raw_cpu_has_fpu
? _restore_fp_context(sc)
: fpu_emulator_restore_context(sc);
}
/*
* This is used by 32-bit signal stuff on the 64-bit kernel
*/
-asmlinkage int (*save_fp_context32)(struct sigcontext32 *sc);
-asmlinkage int (*restore_fp_context32)(struct sigcontext32 *sc);
+asmlinkage int (*save_fp_context32)(struct sigcontext32 __user *sc);
+asmlinkage int (*restore_fp_context32)(struct sigcontext32 __user *sc);
-extern asmlinkage int _save_fp_context32(struct sigcontext32 *sc);
-extern asmlinkage int _restore_fp_context32(struct sigcontext32 *sc);
+extern asmlinkage int _save_fp_context32(struct sigcontext32 __user *sc);
+extern asmlinkage int _restore_fp_context32(struct sigcontext32 __user *sc);
-extern asmlinkage int fpu_emulator_save_context32(struct sigcontext32 *sc);
-extern asmlinkage int fpu_emulator_restore_context32(struct sigcontext32 *sc);
+extern asmlinkage int fpu_emulator_save_context32(struct sigcontext32 __user *sc);
+extern asmlinkage int fpu_emulator_restore_context32(struct sigcontext32 __user *sc);
static inline void signal32_init(void)
{
extern void tlb_init(void);
extern void flush_tlb_handlers(void);
-void __init per_cpu_trap_init(void)
+/*
+ * Timer interrupt
+ */
+int cp0_compare_irq;
+
+/*
+ * Performance counter IRQ or -1 if shared with timer
+ */
+int cp0_perfcount_irq;
+EXPORT_SYMBOL_GPL(cp0_perfcount_irq);
+
+static int __cpuinitdata noulri;
+
+static int __init ulri_disable(char *s)
+{
+ pr_info("Disabling ulri\n");
+ noulri = 1;
+
+ return 1;
+}
+__setup("noulri", ulri_disable);
+
+void __cpuinit per_cpu_trap_init(void)
{
unsigned int cpu = smp_processor_id();
unsigned int status_set = ST0_CU0;
#endif
if (current_cpu_data.isa_level == MIPS_CPU_ISA_IV)
status_set |= ST0_XX;
+ if (cpu_has_dsp)
+ status_set |= ST0_MX;
+
change_c0_status(ST0_CU|ST0_MX|ST0_RE|ST0_FR|ST0_BEV|ST0_TS|ST0_KX|ST0_SX|ST0_UX,
status_set);
- if (cpu_has_dsp)
- set_c0_status(ST0_MX);
+ if (cpu_has_mips_r2) {
+ unsigned int enable = 0x0000000f;
-#ifdef CONFIG_CPU_MIPSR2
- write_c0_hwrena (0x0000000f); /* Allow rdhwr to all registers */
-#endif
+ if (!noulri && cpu_has_userlocal)
+ enable |= (1 << 29);
+
+ write_c0_hwrena(enable);
+ }
#ifdef CONFIG_MIPS_MT_SMTC
if (!secondaryTC) {
#endif /* CONFIG_MIPS_MT_SMTC */
- /*
- * Interrupt handling.
- */
if (cpu_has_veic || cpu_has_vint) {
- write_c0_ebase (ebase);
+ write_c0_ebase(ebase);
/* Setting vector spacing enables EI/VI mode */
- change_c0_intctl (0x3e0, VECTORSPACING);
+ change_c0_intctl(0x3e0, VECTORSPACING);
}
if (cpu_has_divec) {
if (cpu_has_mipsmt) {
} else
set_c0_cause(CAUSEF_IV);
}
+
+ /*
+ * Before R2 both interrupt numbers were fixed to 7, so on R2 only:
+ *
+ * o read IntCtl.IPTI to determine the timer interrupt
+ * o read IntCtl.IPPCI to determine the performance counter interrupt
+ */
+ if (cpu_has_mips_r2) {
+ cp0_compare_irq = (read_c0_intctl() >> 29) & 7;
+ cp0_perfcount_irq = (read_c0_intctl() >> 26) & 7;
+ if (cp0_perfcount_irq == cp0_compare_irq)
+ cp0_perfcount_irq = -1;
+ } else {
+ cp0_compare_irq = CP0_LEGACY_COMPARE_IRQ;
+ cp0_perfcount_irq = -1;
+ }
+
#ifdef CONFIG_MIPS_MT_SMTC
}
#endif /* CONFIG_MIPS_MT_SMTC */
cpu_cache_init();
tlb_init();
#ifdef CONFIG_MIPS_MT_SMTC
+ } else if (!secondaryTC) {
+ /*
+ * First TC in non-boot VPE must do subset of tlb_init()
+ * for MMU countrol registers.
+ */
+ write_c0_pagemask(PM_DEFAULT_MASK);
+ write_c0_wired(0);
}
#endif /* CONFIG_MIPS_MT_SMTC */
}
/* Install CPU exception handler */
-void __init set_handler (unsigned long offset, void *addr, unsigned long size)
+void __init set_handler(unsigned long offset, void *addr, unsigned long size)
{
memcpy((void *)(ebase + offset), addr, size);
- flush_icache_range(ebase + offset, ebase + offset + size);
+ local_flush_icache_range(ebase + offset, ebase + offset + size);
}
+static char panic_null_cerr[] __cpuinitdata =
+ "Trying to set NULL cache error exception handler";
+
/* Install uncached CPU exception handler */
-void __init set_uncached_handler (unsigned long offset, void *addr, unsigned long size)
+void __cpuinit set_uncached_handler(unsigned long offset, void *addr,
+ unsigned long size)
{
#ifdef CONFIG_32BIT
unsigned long uncached_ebase = KSEG1ADDR(ebase);
unsigned long uncached_ebase = TO_UNCAC(ebase);
#endif
+ if (!addr)
+ panic(panic_null_cerr);
+
memcpy((void *)(uncached_ebase + offset), addr, size);
}
+static int __initdata rdhwr_noopt;
+static int __init set_rdhwr_noopt(char *str)
+{
+ rdhwr_noopt = 1;
+ return 1;
+}
+
+__setup("rdhwr_noopt", set_rdhwr_noopt);
+
void __init trap_init(void)
{
extern char except_vec3_generic, except_vec3_r4000;
extern char except_vec4;
unsigned long i;
+ int rollback;
+
+ check_wait();
+ rollback = (cpu_wait == r4k_wait);
+
+#if defined(CONFIG_KGDB)
+ if (kgdb_early_setup)
+ return; /* Already done */
+#endif
if (cpu_has_veic || cpu_has_vint)
- ebase = (unsigned long) alloc_bootmem_low_pages (0x200 + VECTORSPACING*64);
+ ebase = (unsigned long) alloc_bootmem_low_pages(0x200 + VECTORSPACING*64);
else
ebase = CAC_BASE;
- mips_srs_init();
-
per_cpu_trap_init();
/*
* destination.
*/
if (cpu_has_ejtag && board_ejtag_handler_setup)
- board_ejtag_handler_setup ();
+ board_ejtag_handler_setup();
/*
* Only some CPUs have the watch exceptions.
if (board_be_init)
board_be_init();
- set_except_vector(0, handle_int);
+ set_except_vector(0, rollback ? rollback_handle_int : handle_int);
set_except_vector(1, handle_tlbm);
set_except_vector(2, handle_tlbl);
set_except_vector(3, handle_tlbs);
set_except_vector(8, handle_sys);
set_except_vector(9, handle_bp);
- set_except_vector(10, handle_ri);
+ set_except_vector(10, rdhwr_noopt ? handle_ri :
+ (cpu_has_vtag_icache ?
+ handle_ri_rdhwr_vivt : handle_ri_rdhwr));
set_except_vector(11, handle_cpu);
set_except_vector(12, handle_ov);
set_except_vector(13, handle_tr);
- if (current_cpu_data.cputype == CPU_R6000 ||
- current_cpu_data.cputype == CPU_R6000A) {
+ if (current_cpu_type() == CPU_R6000 ||
+ current_cpu_type() == CPU_R6000A) {
/*
* The R6000 is the only R-series CPU that features a machine
* check exception (similar to the R4000 cache error) and
if (cpu_has_mipsmt)
set_except_vector(25, handle_mt);
- if (cpu_has_dsp)
- set_except_vector(26, handle_dsp);
+ set_except_vector(26, handle_dsp);
if (cpu_has_vce)
/* Special exception: R4[04]00 uses also the divec space. */
signal32_init();
#endif
- flush_icache_range(ebase, ebase + 0x400);
+ local_flush_icache_range(ebase, ebase + 0x400);
flush_tlb_handlers();
+
+ sort_extable(__start___dbe_table, __stop___dbe_table);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff