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Diffstat (limited to 'arch/ia64/kernel/kprobes.c')
-rw-r--r--arch/ia64/kernel/kprobes.c230
1 files changed, 161 insertions, 69 deletions
diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
index 51217d63285e..6cb56dd4056d 100644
--- a/arch/ia64/kernel/kprobes.c
+++ b/arch/ia64/kernel/kprobes.c
@@ -88,6 +88,7 @@ static void __kprobes update_kprobe_inst_flag(uint template, uint slot,
{
p->ainsn.inst_flag = 0;
p->ainsn.target_br_reg = 0;
+ p->ainsn.slot = slot;
/* Check for Break instruction
* Bits 37:40 Major opcode to be zero
@@ -129,48 +130,6 @@ static void __kprobes update_kprobe_inst_flag(uint template, uint slot,
/*
* In this function we check to see if the instruction
- * on which we are inserting kprobe is supported.
- * Returns 0 if supported
- * Returns -EINVAL if unsupported
- */
-static int __kprobes unsupported_inst(uint template, uint slot,
- uint major_opcode,
- unsigned long kprobe_inst,
- unsigned long addr)
-{
- if (bundle_encoding[template][slot] == I) {
- switch (major_opcode) {
- case 0x0: //I_UNIT_MISC_OPCODE:
- /*
- * Check for Integer speculation instruction
- * - Bit 33-35 to be equal to 0x1
- */
- if (((kprobe_inst >> 33) & 0x7) == 1) {
- printk(KERN_WARNING
- "Kprobes on speculation inst at <0x%lx> not supported\n",
- addr);
- return -EINVAL;
- }
-
- /*
- * IP relative mov instruction
- * - Bit 27-35 to be equal to 0x30
- */
- if (((kprobe_inst >> 27) & 0x1FF) == 0x30) {
- printk(KERN_WARNING
- "Kprobes on \"mov r1=ip\" at <0x%lx> not supported\n",
- addr);
- return -EINVAL;
-
- }
- }
- }
- return 0;
-}
-
-
-/*
- * In this function we check to see if the instruction
* (qp) cmpx.crel.ctype p1,p2=r2,r3
* on which we are inserting kprobe is cmp instruction
* with ctype as unc.
@@ -206,26 +165,136 @@ out:
}
/*
+ * In this function we check to see if the instruction
+ * on which we are inserting kprobe is supported.
+ * Returns qp value if supported
+ * Returns -EINVAL if unsupported
+ */
+static int __kprobes unsupported_inst(uint template, uint slot,
+ uint major_opcode,
+ unsigned long kprobe_inst,
+ unsigned long addr)
+{
+ int qp;
+
+ qp = kprobe_inst & 0x3f;
+ if (is_cmp_ctype_unc_inst(template, slot, major_opcode, kprobe_inst)) {
+ if (slot == 1 && qp) {
+ printk(KERN_WARNING "Kprobes on cmp unc"
+ "instruction on slot 1 at <0x%lx>"
+ "is not supported\n", addr);
+ return -EINVAL;
+
+ }
+ qp = 0;
+ }
+ else if (bundle_encoding[template][slot] == I) {
+ if (major_opcode == 0) {
+ /*
+ * Check for Integer speculation instruction
+ * - Bit 33-35 to be equal to 0x1
+ */
+ if (((kprobe_inst >> 33) & 0x7) == 1) {
+ printk(KERN_WARNING
+ "Kprobes on speculation inst at <0x%lx> not supported\n",
+ addr);
+ return -EINVAL;
+ }
+ /*
+ * IP relative mov instruction
+ * - Bit 27-35 to be equal to 0x30
+ */
+ if (((kprobe_inst >> 27) & 0x1FF) == 0x30) {
+ printk(KERN_WARNING
+ "Kprobes on \"mov r1=ip\" at <0x%lx> not supported\n",
+ addr);
+ return -EINVAL;
+
+ }
+ }
+ else if ((major_opcode == 5) && !(kprobe_inst & (0xFUl << 33)) &&
+ (kprobe_inst & (0x1UL << 12))) {
+ /* test bit instructions, tbit,tnat,tf
+ * bit 33-36 to be equal to 0
+ * bit 12 to be equal to 1
+ */
+ if (slot == 1 && qp) {
+ printk(KERN_WARNING "Kprobes on test bit"
+ "instruction on slot at <0x%lx>"
+ "is not supported\n", addr);
+ return -EINVAL;
+ }
+ qp = 0;
+ }
+ }
+ else if (bundle_encoding[template][slot] == B) {
+ if (major_opcode == 7) {
+ /* IP-Relative Predict major code is 7 */
+ printk(KERN_WARNING "Kprobes on IP-Relative"
+ "Predict is not supported\n");
+ return -EINVAL;
+ }
+ else if (major_opcode == 2) {
+ /* Indirect Predict, major code is 2
+ * bit 27-32 to be equal to 10 or 11
+ */
+ int x6=(kprobe_inst >> 27) & 0x3F;
+ if ((x6 == 0x10) || (x6 == 0x11)) {
+ printk(KERN_WARNING "Kprobes on"
+ "Indirect Predict is not supported\n");
+ return -EINVAL;
+ }
+ }
+ }
+ /* kernel does not use float instruction, here for safety kprobe
+ * will judge whether it is fcmp/flass/float approximation instruction
+ */
+ else if (unlikely(bundle_encoding[template][slot] == F)) {
+ if ((major_opcode == 4 || major_opcode == 5) &&
+ (kprobe_inst & (0x1 << 12))) {
+ /* fcmp/fclass unc instruction */
+ if (slot == 1 && qp) {
+ printk(KERN_WARNING "Kprobes on fcmp/fclass "
+ "instruction on slot at <0x%lx> "
+ "is not supported\n", addr);
+ return -EINVAL;
+
+ }
+ qp = 0;
+ }
+ if ((major_opcode == 0 || major_opcode == 1) &&
+ (kprobe_inst & (0x1UL << 33))) {
+ /* float Approximation instruction */
+ if (slot == 1 && qp) {
+ printk(KERN_WARNING "Kprobes on float Approx "
+ "instr at <0x%lx> is not supported\n",
+ addr);
+ return -EINVAL;
+ }
+ qp = 0;
+ }
+ }
+ return qp;
+}
+
+/*
* In this function we override the bundle with
* the break instruction at the given slot.
*/
static void __kprobes prepare_break_inst(uint template, uint slot,
uint major_opcode,
unsigned long kprobe_inst,
- struct kprobe *p)
+ struct kprobe *p,
+ int qp)
{
unsigned long break_inst = BREAK_INST;
bundle_t *bundle = &p->opcode.bundle;
/*
* Copy the original kprobe_inst qualifying predicate(qp)
- * to the break instruction iff !is_cmp_ctype_unc_inst
- * because for cmp instruction with ctype equal to unc,
- * which is a special instruction always needs to be
- * executed regradless of qp
+ * to the break instruction
*/
- if (!is_cmp_ctype_unc_inst(template, slot, major_opcode, kprobe_inst))
- break_inst |= (0x3f & kprobe_inst);
+ break_inst |= qp;
switch (slot) {
case 0:
@@ -296,12 +365,6 @@ static int __kprobes valid_kprobe_addr(int template, int slot,
return -EINVAL;
}
- if (slot == 1 && bundle_encoding[template][1] != L) {
- printk(KERN_WARNING "Inserting kprobes on slot #1 "
- "is not supported\n");
- return -EINVAL;
- }
-
return 0;
}
@@ -427,6 +490,7 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
unsigned long kprobe_inst=0;
unsigned int slot = addr & 0xf, template, major_opcode = 0;
bundle_t *bundle;
+ int qp;
bundle = &((kprobe_opcode_t *)kprobe_addr)->bundle;
template = bundle->quad0.template;
@@ -441,9 +505,9 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
/* Get kprobe_inst and major_opcode from the bundle */
get_kprobe_inst(bundle, slot, &kprobe_inst, &major_opcode);
- if (unsupported_inst(template, slot, major_opcode, kprobe_inst, addr))
- return -EINVAL;
-
+ qp = unsupported_inst(template, slot, major_opcode, kprobe_inst, addr);
+ if (qp < 0)
+ return -EINVAL;
p->ainsn.insn = get_insn_slot();
if (!p->ainsn.insn)
@@ -451,37 +515,63 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
memcpy(&p->opcode, kprobe_addr, sizeof(kprobe_opcode_t));
memcpy(p->ainsn.insn, kprobe_addr, sizeof(kprobe_opcode_t));
- prepare_break_inst(template, slot, major_opcode, kprobe_inst, p);
+ prepare_break_inst(template, slot, major_opcode, kprobe_inst, p, qp);
return 0;
}
void __kprobes arch_arm_kprobe(struct kprobe *p)
{
- unsigned long addr = (unsigned long)p->addr;
- unsigned long arm_addr = addr & ~0xFULL;
+ unsigned long arm_addr;
+ bundle_t *src, *dest;
+
+ arm_addr = ((unsigned long)p->addr) & ~0xFUL;
+ dest = &((kprobe_opcode_t *)arm_addr)->bundle;
+ src = &p->opcode.bundle;
flush_icache_range((unsigned long)p->ainsn.insn,
(unsigned long)p->ainsn.insn + sizeof(kprobe_opcode_t));
- memcpy((char *)arm_addr, &p->opcode, sizeof(kprobe_opcode_t));
+ switch (p->ainsn.slot) {
+ case 0:
+ dest->quad0.slot0 = src->quad0.slot0;
+ break;
+ case 1:
+ dest->quad1.slot1_p1 = src->quad1.slot1_p1;
+ break;
+ case 2:
+ dest->quad1.slot2 = src->quad1.slot2;
+ break;
+ }
flush_icache_range(arm_addr, arm_addr + sizeof(kprobe_opcode_t));
}
void __kprobes arch_disarm_kprobe(struct kprobe *p)
{
- unsigned long addr = (unsigned long)p->addr;
- unsigned long arm_addr = addr & ~0xFULL;
+ unsigned long arm_addr;
+ bundle_t *src, *dest;
+ arm_addr = ((unsigned long)p->addr) & ~0xFUL;
+ dest = &((kprobe_opcode_t *)arm_addr)->bundle;
/* p->ainsn.insn contains the original unaltered kprobe_opcode_t */
- memcpy((char *) arm_addr, (char *) p->ainsn.insn,
- sizeof(kprobe_opcode_t));
+ src = &p->ainsn.insn->bundle;
+ switch (p->ainsn.slot) {
+ case 0:
+ dest->quad0.slot0 = src->quad0.slot0;
+ break;
+ case 1:
+ dest->quad1.slot1_p1 = src->quad1.slot1_p1;
+ break;
+ case 2:
+ dest->quad1.slot2 = src->quad1.slot2;
+ break;
+ }
flush_icache_range(arm_addr, arm_addr + sizeof(kprobe_opcode_t));
}
void __kprobes arch_remove_kprobe(struct kprobe *p)
{
mutex_lock(&kprobe_mutex);
- free_insn_slot(p->ainsn.insn);
+ free_insn_slot(p->ainsn.insn, 0);
mutex_unlock(&kprobe_mutex);
}
/*
@@ -807,7 +897,9 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
switch(val) {
case DIE_BREAK:
/* err is break number from ia64_bad_break() */
- if (args->err == 0x80200 || args->err == 0x80300 || args->err == 0)
+ if ((args->err >> 12) == (__IA64_BREAK_KPROBE >> 12)
+ || args->err == __IA64_BREAK_JPROBE
+ || args->err == 0)
if (pre_kprobes_handler(args))
ret = NOTIFY_STOP;
break;
@@ -851,7 +943,7 @@ static void ia64_get_bsp_cfm(struct unw_frame_info *info, void *arg)
return;
}
} while (unw_unwind(info) >= 0);
- lp->bsp = 0;
+ lp->bsp = NULL;
lp->cfm = 0;
return;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-16 13:42:51 +0100