Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6

[linux-2.6] / arch / ia64 / kernel / kprobes.c

diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
index 6cb56dd4056d1306097714b6a825fcc01d176f25..5fd65d8302c8561e50cf12a576f0c54569c30d1d 100644 (file)
--- a/arch/ia64/kernel/kprobes.c
+++ b/arch/ia64/kernel/kprobes.c
@@ -29,9 +29,9 @@
 #include <linux/slab.h>
 #include <linux/preempt.h>
 #include <linux/moduleloader.h>
+#include <linux/kdebug.h>
 
 #include <asm/pgtable.h>
-#include <asm/kdebug.h>
 #include <asm/sections.h>
 #include <asm/uaccess.h>
 
@@ -40,6 +40,8 @@ extern void jprobe_inst_return(void);
 DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
 DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
 
+struct kretprobe_blackpoint kretprobe_blacklist[] = {{NULL, NULL}};
+
 enum instruction_type {A, I, M, F, B, L, X, u};
 static enum instruction_type bundle_encoding[32][3] = {
   { M, I, I },                         /* 00 */
@@ -151,12 +153,12 @@ static uint __kprobes is_cmp_ctype_unc_inst(uint template, uint slot,
 
        cmp_inst.l = kprobe_inst;
        if ((cmp_inst.f.x2 == 0) || (cmp_inst.f.x2 == 1)) {
-               /* Integere compare - Register Register (A6 type)*/
+               /* Integer compare - Register Register (A6 type)*/
                if ((cmp_inst.f.tb == 0) && (cmp_inst.f.ta == 0)
                                &&(cmp_inst.f.c == 1))
                        ctype_unc = 1;
        } else if ((cmp_inst.f.x2 == 2)||(cmp_inst.f.x2 == 3)) {
-               /* Integere compare - Immediate Register (A8 type)*/
+               /* Integer compare - Immediate Register (A8 type)*/
                if ((cmp_inst.f.ta == 0) &&(cmp_inst.f.c == 1))
                        ctype_unc = 1;
        }
@@ -370,14 +372,18 @@ static int __kprobes valid_kprobe_addr(int template, int slot,
 
 static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
 {
-       kcb->prev_kprobe.kp = kprobe_running();
-       kcb->prev_kprobe.status = kcb->kprobe_status;
+       unsigned int i;
+       i = atomic_add_return(1, &kcb->prev_kprobe_index);
+       kcb->prev_kprobe[i-1].kp = kprobe_running();
+       kcb->prev_kprobe[i-1].status = kcb->kprobe_status;
 }
 
 static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
 {
-       __get_cpu_var(current_kprobe) = kcb->prev_kprobe.kp;
-       kcb->kprobe_status = kcb->prev_kprobe.status;
+       unsigned int i;
+       i = atomic_sub_return(1, &kcb->prev_kprobe_index);
+       __get_cpu_var(current_kprobe) = kcb->prev_kprobe[i].kp;
+       kcb->kprobe_status = kcb->prev_kprobe[i].status;
 }
 
 static void __kprobes set_current_kprobe(struct kprobe *p,
@@ -444,7 +450,8 @@ int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
                        break;
        }
 
-       BUG_ON(!orig_ret_address || (orig_ret_address == trampoline_address));
+       kretprobe_assert(ri, orig_ret_address, trampoline_address);
+
        regs->cr_iip = orig_ret_address;
 
        reset_current_kprobe();
@@ -464,23 +471,13 @@ int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
 }
 
 /* Called with kretprobe_lock held */
-void __kprobes arch_prepare_kretprobe(struct kretprobe *rp,
+void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
                                      struct pt_regs *regs)
 {
-       struct kretprobe_instance *ri;
-
-       if ((ri = get_free_rp_inst(rp)) != NULL) {
-               ri->rp = rp;
-               ri->task = current;
-               ri->ret_addr = (kprobe_opcode_t *)regs->b0;
-
-               /* Replace the return addr with trampoline addr */
-               regs->b0 = ((struct fnptr *)kretprobe_trampoline)->ip;
+       ri->ret_addr = (kprobe_opcode_t *)regs->b0;
 
-               add_rp_inst(ri);
-       } else {
-               rp->nmissed++;
-       }
+       /* Replace the return addr with trampoline addr */
+       regs->b0 = ((struct fnptr *)kretprobe_trampoline)->ip;
 }
 
 int __kprobes arch_prepare_kprobe(struct kprobe *p)
@@ -825,7 +822,7 @@ out:
        return 1;
 }
 
-static int __kprobes kprobes_fault_handler(struct pt_regs *regs, int trapnr)
+int __kprobes kprobes_fault_handler(struct pt_regs *regs, int trapnr)
 {
        struct kprobe *cur = kprobe_running();
        struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
@@ -909,13 +906,6 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
                        if (post_kprobes_handler(args->regs))
                                ret = NOTIFY_STOP;
                break;
-       case DIE_PAGE_FAULT:
-               /* kprobe_running() needs smp_processor_id() */
-               preempt_disable();
-               if (kprobe_running() &&
-                       kprobes_fault_handler(args->regs, args->trapnr))
-                       ret = NOTIFY_STOP;
-               preempt_enable();
        default:
                break;
        }
@@ -948,10 +938,15 @@ static void ia64_get_bsp_cfm(struct unw_frame_info *info, void *arg)
        return;
 }
 
+unsigned long arch_deref_entry_point(void *entry)
+{
+       return ((struct fnptr *)entry)->ip;
+}
+
 int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
 {
        struct jprobe *jp = container_of(p, struct jprobe, kp);
-       unsigned long addr = ((struct fnptr *)(jp->entry))->ip;
+       unsigned long addr = arch_deref_entry_point(jp->entry);
        struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
        struct param_bsp_cfm pa;
        int bytes;
@@ -959,7 +954,7 @@ int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
        /*
         * Callee owns the argument space and could overwrite it, eg
         * tail call optimization. So to be absolutely safe
-        * we save the argument space before transfering the control
+        * we save the argument space before transferring the control
         * to instrumented jprobe function which runs in
         * the process context
         */
@@ -1021,3 +1016,12 @@ int __init arch_init_kprobes(void)
                (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip;
        return register_kprobe(&trampoline_p);
 }
+
+int __kprobes arch_trampoline_kprobe(struct kprobe *p)
+{
+       if (p->addr ==
+               (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip)
+               return 1;
+
+       return 0;
+}