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Diffstat (limited to 'arch/sparc64/kernel/kprobes.c')
-rw-r--r--arch/sparc64/kernel/kprobes.c165
1 files changed, 82 insertions, 83 deletions
diff --git a/arch/sparc64/kernel/kprobes.c b/arch/sparc64/kernel/kprobes.c
index 0d66d07c8c6..96bd09b098f 100644
--- a/arch/sparc64/kernel/kprobes.c
+++ b/arch/sparc64/kernel/kprobes.c
@@ -38,6 +38,9 @@
* - Mark that we are no longer actively in a kprobe.
*/
+DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
+DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
+
int __kprobes arch_prepare_kprobe(struct kprobe *p)
{
return 0;
@@ -66,46 +69,39 @@ void __kprobes arch_remove_kprobe(struct kprobe *p)
{
}
-static struct kprobe *current_kprobe;
-static unsigned long current_kprobe_orig_tnpc;
-static unsigned long current_kprobe_orig_tstate_pil;
-static unsigned int kprobe_status;
-static struct kprobe *kprobe_prev;
-static unsigned long kprobe_orig_tnpc_prev;
-static unsigned long kprobe_orig_tstate_pil_prev;
-static unsigned int kprobe_status_prev;
-
-static inline void save_previous_kprobe(void)
+static inline void save_previous_kprobe(struct kprobe_ctlblk *kcb)
{
- kprobe_status_prev = kprobe_status;
- kprobe_orig_tnpc_prev = current_kprobe_orig_tnpc;
- kprobe_orig_tstate_pil_prev = current_kprobe_orig_tstate_pil;
- kprobe_prev = current_kprobe;
+ kcb->prev_kprobe.kp = kprobe_running();
+ kcb->prev_kprobe.status = kcb->kprobe_status;
+ kcb->prev_kprobe.orig_tnpc = kcb->kprobe_orig_tnpc;
+ kcb->prev_kprobe.orig_tstate_pil = kcb->kprobe_orig_tstate_pil;
}
-static inline void restore_previous_kprobe(void)
+static inline void restore_previous_kprobe(struct kprobe_ctlblk *kcb)
{
- kprobe_status = kprobe_status_prev;
- current_kprobe_orig_tnpc = kprobe_orig_tnpc_prev;
- current_kprobe_orig_tstate_pil = kprobe_orig_tstate_pil_prev;
- current_kprobe = kprobe_prev;
+ __get_cpu_var(current_kprobe) = kcb->prev_kprobe.kp;
+ kcb->kprobe_status = kcb->prev_kprobe.status;
+ kcb->kprobe_orig_tnpc = kcb->prev_kprobe.orig_tnpc;
+ kcb->kprobe_orig_tstate_pil = kcb->prev_kprobe.orig_tstate_pil;
}
-static inline void set_current_kprobe(struct kprobe *p, struct pt_regs *regs)
+static inline void set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
+ struct kprobe_ctlblk *kcb)
{
- current_kprobe_orig_tnpc = regs->tnpc;
- current_kprobe_orig_tstate_pil = (regs->tstate & TSTATE_PIL);
- current_kprobe = p;
+ __get_cpu_var(current_kprobe) = p;
+ kcb->kprobe_orig_tnpc = regs->tnpc;
+ kcb->kprobe_orig_tstate_pil = (regs->tstate & TSTATE_PIL);
}
-static inline void prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
+static inline void prepare_singlestep(struct kprobe *p, struct pt_regs *regs,
+ struct kprobe_ctlblk *kcb)
{
regs->tstate |= TSTATE_PIL;
/*single step inline, if it a breakpoint instruction*/
if (p->opcode == BREAKPOINT_INSTRUCTION) {
regs->tpc = (unsigned long) p->addr;
- regs->tnpc = current_kprobe_orig_tnpc;
+ regs->tnpc = kcb->kprobe_orig_tnpc;
} else {
regs->tpc = (unsigned long) &p->ainsn.insn[0];
regs->tnpc = (unsigned long) &p->ainsn.insn[1];
@@ -117,19 +113,21 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
struct kprobe *p;
void *addr = (void *) regs->tpc;
int ret = 0;
+ struct kprobe_ctlblk *kcb;
+ /*
+ * We don't want to be preempted for the entire
+ * duration of kprobe processing
+ */
preempt_disable();
+ kcb = get_kprobe_ctlblk();
if (kprobe_running()) {
- /* We *are* holding lock here, so this is safe.
- * Disarm the probe we just hit, and ignore it.
- */
p = get_kprobe(addr);
if (p) {
- if (kprobe_status == KPROBE_HIT_SS) {
+ if (kcb->kprobe_status == KPROBE_HIT_SS) {
regs->tstate = ((regs->tstate & ~TSTATE_PIL) |
- current_kprobe_orig_tstate_pil);
- unlock_kprobes();
+ kcb->kprobe_orig_tstate_pil);
goto no_kprobe;
}
/* We have reentered the kprobe_handler(), since
@@ -138,25 +136,22 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
* just single step on the instruction of the new probe
* without calling any user handlers.
*/
- save_previous_kprobe();
- set_current_kprobe(p, regs);
+ save_previous_kprobe(kcb);
+ set_current_kprobe(p, regs, kcb);
p->nmissed++;
- kprobe_status = KPROBE_REENTER;
- prepare_singlestep(p, regs);
+ kcb->kprobe_status = KPROBE_REENTER;
+ prepare_singlestep(p, regs, kcb);
return 1;
} else {
- p = current_kprobe;
+ p = __get_cpu_var(current_kprobe);
if (p->break_handler && p->break_handler(p, regs))
goto ss_probe;
}
- /* If it's not ours, can't be delete race, (we hold lock). */
goto no_kprobe;
}
- lock_kprobes();
p = get_kprobe(addr);
if (!p) {
- unlock_kprobes();
if (*(u32 *)addr != BREAKPOINT_INSTRUCTION) {
/*
* The breakpoint instruction was removed right
@@ -171,14 +166,14 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
goto no_kprobe;
}
- set_current_kprobe(p, regs);
- kprobe_status = KPROBE_HIT_ACTIVE;
+ set_current_kprobe(p, regs, kcb);
+ kcb->kprobe_status = KPROBE_HIT_ACTIVE;
if (p->pre_handler && p->pre_handler(p, regs))
return 1;
ss_probe:
- prepare_singlestep(p, regs);
- kprobe_status = KPROBE_HIT_SS;
+ prepare_singlestep(p, regs, kcb);
+ kcb->kprobe_status = KPROBE_HIT_SS;
return 1;
no_kprobe:
@@ -260,11 +255,12 @@ static void __kprobes retpc_fixup(struct pt_regs *regs, u32 insn,
* This function prepares to return from the post-single-step
* breakpoint trap.
*/
-static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs)
+static void __kprobes resume_execution(struct kprobe *p,
+ struct pt_regs *regs, struct kprobe_ctlblk *kcb)
{
u32 insn = p->ainsn.insn[0];
- regs->tpc = current_kprobe_orig_tnpc;
+ regs->tpc = kcb->kprobe_orig_tnpc;
regs->tnpc = relbranch_fixup(insn,
(unsigned long) p->addr,
(unsigned long) &p->ainsn.insn[0],
@@ -272,44 +268,48 @@ static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs)
retpc_fixup(regs, insn, (unsigned long) p->addr);
regs->tstate = ((regs->tstate & ~TSTATE_PIL) |
- current_kprobe_orig_tstate_pil);
+ kcb->kprobe_orig_tstate_pil);
}
static inline int post_kprobe_handler(struct pt_regs *regs)
{
- if (!kprobe_running())
+ struct kprobe *cur = kprobe_running();
+ struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+
+ if (!cur)
return 0;
- if ((kprobe_status != KPROBE_REENTER) && current_kprobe->post_handler) {
- kprobe_status = KPROBE_HIT_SSDONE;
- current_kprobe->post_handler(current_kprobe, regs, 0);
+ if ((kcb->kprobe_status != KPROBE_REENTER) && cur->post_handler) {
+ kcb->kprobe_status = KPROBE_HIT_SSDONE;
+ cur->post_handler(cur, regs, 0);
}
- resume_execution(current_kprobe, regs);
+ resume_execution(cur, regs, kcb);
/*Restore back the original saved kprobes variables and continue. */
- if (kprobe_status == KPROBE_REENTER) {
- restore_previous_kprobe();
+ if (kcb->kprobe_status == KPROBE_REENTER) {
+ restore_previous_kprobe(kcb);
goto out;
}
- unlock_kprobes();
+ reset_current_kprobe();
out:
preempt_enable_no_resched();
return 1;
}
-/* Interrupts disabled, kprobe_lock held. */
static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
{
- if (current_kprobe->fault_handler
- && current_kprobe->fault_handler(current_kprobe, regs, trapnr))
+ struct kprobe *cur = kprobe_running();
+ struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+
+ if (cur->fault_handler && cur->fault_handler(cur, regs, trapnr))
return 1;
- if (kprobe_status & KPROBE_HIT_SS) {
- resume_execution(current_kprobe, regs);
+ if (kcb->kprobe_status & KPROBE_HIT_SS) {
+ resume_execution(cur, regs, kcb);
- unlock_kprobes();
+ reset_current_kprobe();
preempt_enable_no_resched();
}
return 0;
@@ -322,29 +322,30 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
unsigned long val, void *data)
{
struct die_args *args = (struct die_args *)data;
+ int ret = NOTIFY_DONE;
+
switch (val) {
case DIE_DEBUG:
if (kprobe_handler(args->regs))
- return NOTIFY_STOP;
+ ret = NOTIFY_STOP;
break;
case DIE_DEBUG_2:
if (post_kprobe_handler(args->regs))
- return NOTIFY_STOP;
+ ret = NOTIFY_STOP;
break;
case DIE_GPF:
- if (kprobe_running() &&
- kprobe_fault_handler(args->regs, args->trapnr))
- return NOTIFY_STOP;
- break;
case DIE_PAGE_FAULT:
+ /* kprobe_running() needs smp_processor_id() */
+ preempt_disable();
if (kprobe_running() &&
kprobe_fault_handler(args->regs, args->trapnr))
- return NOTIFY_STOP;
+ ret = NOTIFY_STOP;
+ preempt_enable();
break;
default:
break;
}
- return NOTIFY_DONE;
+ return ret;
}
asmlinkage void __kprobes kprobe_trap(unsigned long trap_level,
@@ -368,24 +369,21 @@ asmlinkage void __kprobes kprobe_trap(unsigned long trap_level,
}
/* Jprobes support. */
-static struct pt_regs jprobe_saved_regs;
-static struct pt_regs *jprobe_saved_regs_location;
-static struct sparc_stackf jprobe_saved_stack;
-
int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
{
struct jprobe *jp = container_of(p, struct jprobe, kp);
+ struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
- jprobe_saved_regs_location = regs;
- memcpy(&jprobe_saved_regs, regs, sizeof(*regs));
+ kcb->jprobe_saved_regs_location = regs;
+ memcpy(&(kcb->jprobe_saved_regs), regs, sizeof(*regs));
/* Save a whole stack frame, this gets arguments
* pushed onto the stack after using up all the
* arg registers.
*/
- memcpy(&jprobe_saved_stack,
+ memcpy(&(kcb->jprobe_saved_stack),
(char *) (regs->u_regs[UREG_FP] + STACK_BIAS),
- sizeof(jprobe_saved_stack));
+ sizeof(kcb->jprobe_saved_stack));
regs->tpc = (unsigned long) jp->entry;
regs->tnpc = ((unsigned long) jp->entry) + 0x4UL;
@@ -396,7 +394,6 @@ int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
void __kprobes jprobe_return(void)
{
- preempt_enable_no_resched();
__asm__ __volatile__(
".globl jprobe_return_trap_instruction\n"
"jprobe_return_trap_instruction:\n\t"
@@ -410,14 +407,15 @@ extern void __show_regs(struct pt_regs * regs);
int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
{
u32 *addr = (u32 *) regs->tpc;
+ struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
if (addr == (u32 *) jprobe_return_trap_instruction) {
- if (jprobe_saved_regs_location != regs) {
+ if (kcb->jprobe_saved_regs_location != regs) {
printk("JPROBE: Current regs (%p) does not match "
"saved regs (%p).\n",
- regs, jprobe_saved_regs_location);
+ regs, kcb->jprobe_saved_regs_location);
printk("JPROBE: Saved registers\n");
- __show_regs(jprobe_saved_regs_location);
+ __show_regs(kcb->jprobe_saved_regs_location);
printk("JPROBE: Current registers\n");
__show_regs(regs);
BUG();
@@ -426,12 +424,13 @@ int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
* first so that UREG_FP is the original one for
* the stack frame restore.
*/
- memcpy(regs, &jprobe_saved_regs, sizeof(*regs));
+ memcpy(regs, &(kcb->jprobe_saved_regs), sizeof(*regs));
memcpy((char *) (regs->u_regs[UREG_FP] + STACK_BIAS),
- &jprobe_saved_stack,
- sizeof(jprobe_saved_stack));
+ &(kcb->jprobe_saved_stack),
+ sizeof(kcb->jprobe_saved_stack));
+ preempt_enable_no_resched();
return 1;
}
return 0;
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-17 09:07:10 +0000