1 files changed, 281 insertions, 0 deletions

diff --git a/arch/mips/kernel/kgdb.c b/arch/mips/kernel/kgdb.c
new file mode 100644
index 000000000000..c5a8b2d21ca4
--- /dev/null
+++ b/arch/mips/kernel/kgdb.c
@@ -0,0 +1,281 @@
+/*
+ *  Originally written by Glenn Engel, Lake Stevens Instrument Division
+ *
+ *  Contributed by HP Systems
+ *
+ *  Modified for Linux/MIPS (and MIPS in general) by Andreas Busse
+ *  Send complaints, suggestions etc. to <andy@waldorf-gmbh.de>
+ *
+ *  Copyright (C) 1995 Andreas Busse
+ *
+ *  Copyright (C) 2003 MontaVista Software Inc.
+ *  Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
+ *
+ *  Copyright (C) 2004-2005 MontaVista Software Inc.
+ *  Author: Manish Lachwani, mlachwani@mvista.com or manish@koffee-break.com
+ *
+ *  Copyright (C) 2007-2008 Wind River Systems, Inc.
+ *  Author/Maintainer: Jason Wessel, jason.wessel@windriver.com
+ *
+ *  This file is licensed under the terms of the GNU General Public License
+ *  version 2. This program is licensed "as is" without any warranty of any
+ *  kind, whether express or implied.
+ */
+
+#include <linux/ptrace.h>               /* for linux pt_regs struct */
+#include <linux/kgdb.h>
+#include <linux/kdebug.h>
+#include <linux/sched.h>
+#include <asm/inst.h>
+#include <asm/fpu.h>
+#include <asm/cacheflush.h>
+#include <asm/processor.h>
+#include <asm/sigcontext.h>
+
+static struct hard_trap_info {
+        unsigned char tt;       /* Trap type code for MIPS R3xxx and R4xxx */
+        unsigned char signo;    /* Signal that we map this trap into */
+} hard_trap_info[] = {
+        { 6, SIGBUS },          /* instruction bus error */
+        { 7, SIGBUS },          /* data bus error */
+        { 9, SIGTRAP },         /* break */
+/*      { 11, SIGILL }, */      /* CPU unusable */
+        { 12, SIGFPE },         /* overflow */
+        { 13, SIGTRAP },        /* trap */
+        { 14, SIGSEGV },        /* virtual instruction cache coherency */
+        { 15, SIGFPE },         /* floating point exception */
+        { 23, SIGSEGV },        /* watch */
+        { 31, SIGSEGV },        /* virtual data cache coherency */
+        { 0, 0}                 /* Must be last */
+};
+
+void arch_kgdb_breakpoint(void)
+{
+        __asm__ __volatile__(
+                ".globl breakinst\n\t"
+                ".set\tnoreorder\n\t"
+                "nop\n"
+                "breakinst:\tbreak\n\t"
+                "nop\n\t"
+                ".set\treorder");
+}
+
+static void kgdb_call_nmi_hook(void *ignored)
+{
+        kgdb_nmicallback(raw_smp_processor_id(), (void *)0);
+}
+
+void kgdb_roundup_cpus(unsigned long flags)
+{
+        local_irq_enable();
+        smp_call_function(kgdb_call_nmi_hook, NULL, NULL);
+        local_irq_disable();
+}
+
+static int compute_signal(int tt)
+{
+        struct hard_trap_info *ht;
+
+        for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
+                if (ht->tt == tt)
+                        return ht->signo;
+
+        return SIGHUP;          /* default for things we don't know about */
+}
+
+void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+        int reg;
+
+#if (KGDB_GDB_REG_SIZE == 32)
+        u32 *ptr = (u32 *)gdb_regs;
+#else
+        u64 *ptr = (u64 *)gdb_regs;
+#endif
+
+        for (reg = 0; reg < 32; reg++)
+                *(ptr++) = regs->regs[reg];
+
+        *(ptr++) = regs->cp0_status;
+        *(ptr++) = regs->lo;
+        *(ptr++) = regs->hi;
+        *(ptr++) = regs->cp0_badvaddr;
+        *(ptr++) = regs->cp0_cause;
+        *(ptr++) = regs->cp0_epc;
+
+        /* FP REGS */
+        if (!(current && (regs->cp0_status & ST0_CU1)))
+                return;
+
+        save_fp(current);
+        for (reg = 0; reg < 32; reg++)
+                *(ptr++) = current->thread.fpu.fpr[reg];
+}
+
+void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+        int reg;
+
+#if (KGDB_GDB_REG_SIZE == 32)
+        const u32 *ptr = (u32 *)gdb_regs;
+#else
+        const u64 *ptr = (u64 *)gdb_regs;
+#endif
+
+        for (reg = 0; reg < 32; reg++)
+                regs->regs[reg] = *(ptr++);
+
+        regs->cp0_status = *(ptr++);
+        regs->lo = *(ptr++);
+        regs->hi = *(ptr++);
+        regs->cp0_badvaddr = *(ptr++);
+        regs->cp0_cause = *(ptr++);
+        regs->cp0_epc = *(ptr++);
+
+        /* FP REGS from current */
+        if (!(current && (regs->cp0_status & ST0_CU1)))
+                return;
+
+        for (reg = 0; reg < 32; reg++)
+                current->thread.fpu.fpr[reg] = *(ptr++);
+        restore_fp(current);
+}
+
+/*
+ * Similar to regs_to_gdb_regs() except that process is sleeping and so
+ * we may not be able to get all the info.
+ */
+void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
+{
+        int reg;
+        struct thread_info *ti = task_thread_info(p);
+        unsigned long ksp = (unsigned long)ti + THREAD_SIZE - 32;
+        struct pt_regs *regs = (struct pt_regs *)ksp - 1;
+#if (KGDB_GDB_REG_SIZE == 32)
+        u32 *ptr = (u32 *)gdb_regs;
+#else
+        u64 *ptr = (u64 *)gdb_regs;
+#endif
+
+        for (reg = 0; reg < 16; reg++)
+                *(ptr++) = regs->regs[reg];
+
+        /* S0 - S7 */
+        for (reg = 16; reg < 24; reg++)
+                *(ptr++) = regs->regs[reg];
+
+        for (reg = 24; reg < 28; reg++)
+                *(ptr++) = 0;
+
+        /* GP, SP, FP, RA */
+        for (reg = 28; reg < 32; reg++)
+                *(ptr++) = regs->regs[reg];
+
+        *(ptr++) = regs->cp0_status;
+        *(ptr++) = regs->lo;
+        *(ptr++) = regs->hi;
+        *(ptr++) = regs->cp0_badvaddr;
+        *(ptr++) = regs->cp0_cause;
+        *(ptr++) = regs->cp0_epc;
+}
+
+/*
+ * Calls linux_debug_hook before the kernel dies. If KGDB is enabled,
+ * then try to fall into the debugger
+ */
+static int kgdb_mips_notify(struct notifier_block *self, unsigned long cmd,
+                            void *ptr)
+{
+        struct die_args *args = (struct die_args *)ptr;
+        struct pt_regs *regs = args->regs;
+        int trap = (regs->cp0_cause & 0x7c) >> 2;
+
+        if (fixup_exception(regs))
+                return NOTIFY_DONE;
+
+        /* Userpace events, ignore. */
+        if (user_mode(regs))
+                return NOTIFY_DONE;
+
+        if (atomic_read(&kgdb_active) != -1)
+                kgdb_nmicallback(smp_processor_id(), regs);
+
+        if (kgdb_handle_exception(trap, compute_signal(trap), 0, regs))
+                return NOTIFY_DONE;
+
+        if (atomic_read(&kgdb_setting_breakpoint))
+                if ((trap == 9) && (regs->cp0_epc == (unsigned long)breakinst))
+                        regs->cp0_epc += 4;
+
+        /* In SMP mode, __flush_cache_all does IPI */
+        local_irq_enable();
+        __flush_cache_all();
+
+        return NOTIFY_STOP;
+}
+
+static struct notifier_block kgdb_notifier = {
+        .notifier_call = kgdb_mips_notify,
+};
+
+/*
+ * Handle the 's' and 'c' commands
+ */
+int kgdb_arch_handle_exception(int vector, int signo, int err_code,
+                               char *remcom_in_buffer, char *remcom_out_buffer,
+                               struct pt_regs *regs)
+{
+        char *ptr;
+        unsigned long address;
+        int cpu = smp_processor_id();
+
+        switch (remcom_in_buffer[0]) {
+        case 's':
+        case 'c':
+                /* handle the optional parameter */
+                ptr = &remcom_in_buffer[1];
+                if (kgdb_hex2long(&ptr, &address))
+                        regs->cp0_epc = address;
+
+                atomic_set(&kgdb_cpu_doing_single_step, -1);
+                if (remcom_in_buffer[0] == 's')
+                        if (kgdb_contthread)
+                                atomic_set(&kgdb_cpu_doing_single_step, cpu);
+
+                return 0;
+        }
+
+        return -1;
+}
+
+struct kgdb_arch arch_kgdb_ops;
+
+/*
+ * We use kgdb_early_setup so that functions we need to call now don't
+ * cause trouble when called again later.
+ */
+int kgdb_arch_init(void)
+{
+        union mips_instruction insn = {
+                .r_format = {
+                        .opcode = spec_op,
+                        .func   = break_op,
+                }
+        };
+        memcpy(arch_kgdb_ops.gdb_bpt_instr, insn.byte, BREAK_INSTR_SIZE);
+
+        register_die_notifier(&kgdb_notifier);
+
+        return 0;
+}
+
+/*
+ *      kgdb_arch_exit - Perform any architecture specific uninitalization.
+ *
+ *      This function will handle the uninitalization of any architecture
+ *      specific callbacks, for dynamic registration and unregistration.
+ */
+void kgdb_arch_exit(void)
+{
+        unregister_die_notifier(&kgdb_notifier);
+}