diff options
| -rw-r--r-- | arch/ia64/kernel/kprobes.c | 43 | ||||
| -rw-r--r-- | include/asm-ia64/kprobes.h | 17 |
2 files changed, 58 insertions, 2 deletions
diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c index 5d534468155..51bc08bd046 100644 --- a/arch/ia64/kernel/kprobes.c +++ b/arch/ia64/kernel/kprobes.c @@ -120,6 +120,41 @@ static void update_kprobe_inst_flag(uint template, uint slot, uint major_opcode } /* + * 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. + */ +static uint is_cmp_ctype_unc_inst(uint template, uint slot, uint major_opcode, +unsigned long kprobe_inst) +{ + cmp_inst_t cmp_inst; + uint ctype_unc = 0; + + if (!((bundle_encoding[template][slot] == I) || + (bundle_encoding[template][slot] == M))) + goto out; + + if (!((major_opcode == 0xC) || (major_opcode == 0xD) || + (major_opcode == 0xE))) + goto out; + + cmp_inst.l = kprobe_inst; + if ((cmp_inst.f.x2 == 0) || (cmp_inst.f.x2 == 1)) { + /* Integere 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)*/ + if ((cmp_inst.f.ta == 0) &&(cmp_inst.f.c == 1)) + ctype_unc = 1; + } +out: + return ctype_unc; +} + +/* * In this function we override the bundle with * the break instruction at the given slot. */ @@ -131,9 +166,13 @@ static void prepare_break_inst(uint template, uint slot, uint major_opcode, /* * Copy the original kprobe_inst qualifying predicate(qp) - * to the break instruction + * 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 */ - break_inst |= (0x3f & kprobe_inst); + if (!is_cmp_ctype_unc_inst(template, slot, major_opcode, kprobe_inst)) + break_inst |= (0x3f & kprobe_inst); switch (slot) { case 0: diff --git a/include/asm-ia64/kprobes.h b/include/asm-ia64/kprobes.h index cec4d995830..7b700035e36 100644 --- a/include/asm-ia64/kprobes.h +++ b/include/asm-ia64/kprobes.h @@ -30,6 +30,23 @@ #define BREAK_INST (long)(__IA64_BREAK_KPROBE << 6) +typedef union cmp_inst { + struct { + unsigned long long qp : 6; + unsigned long long p1 : 6; + unsigned long long c : 1; + unsigned long long r2 : 7; + unsigned long long r3 : 7; + unsigned long long p2 : 6; + unsigned long long ta : 1; + unsigned long long x2 : 2; + unsigned long long tb : 1; + unsigned long long opcode : 4; + unsigned long long reserved : 23; + }f; + unsigned long long l; +} cmp_inst_t; + struct kprobe; typedef struct _bundle { |