ARM: kprobes: Add kprobes-common.c

This file will contain the instruction decoding and emulation code
which is common to both ARM and Thumb instruction sets.

For now, we will just move over condition_checks from kprobes-arm.c
This table is also renamed to kprobe_condition_checks to avoid polluting
the public namespace with a too generic name.

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>

1 files changed, 1 insertions, 91 deletions

diff --git a/arch/arm/kernel/kprobes-arm.c b/arch/arm/kernel/kprobes-arm.c
index 976ce14c5576..8d4464f9471b 100644
--- a/arch/arm/kernel/kprobes-arm.c
+++ b/arch/arm/kernel/kprobes-arm.c
@@ -1523,96 +1523,6 @@ space_cccc_11xx(kprobe_opcode_t insn, struct arch_specific_insn *asi)
         return INSN_REJECTED;
 }
 
-static unsigned long __kprobes __check_eq(unsigned long cpsr)
-{
-        return cpsr & PSR_Z_BIT;
-}
-
-static unsigned long __kprobes __check_ne(unsigned long cpsr)
-{
-        return (~cpsr) & PSR_Z_BIT;
-}
-
-static unsigned long __kprobes __check_cs(unsigned long cpsr)
-{
-        return cpsr & PSR_C_BIT;
-}
-
-static unsigned long __kprobes __check_cc(unsigned long cpsr)
-{
-        return (~cpsr) & PSR_C_BIT;
-}
-
-static unsigned long __kprobes __check_mi(unsigned long cpsr)
-{
-        return cpsr & PSR_N_BIT;
-}
-
-static unsigned long __kprobes __check_pl(unsigned long cpsr)
-{
-        return (~cpsr) & PSR_N_BIT;
-}
-
-static unsigned long __kprobes __check_vs(unsigned long cpsr)
-{
-        return cpsr & PSR_V_BIT;
-}
-
-static unsigned long __kprobes __check_vc(unsigned long cpsr)
-{
-        return (~cpsr) & PSR_V_BIT;
-}
-
-static unsigned long __kprobes __check_hi(unsigned long cpsr)
-{
-        cpsr &= ~(cpsr >> 1); /* PSR_C_BIT &= ~PSR_Z_BIT */
-        return cpsr & PSR_C_BIT;
-}
-
-static unsigned long __kprobes __check_ls(unsigned long cpsr)
-{
-        cpsr &= ~(cpsr >> 1); /* PSR_C_BIT &= ~PSR_Z_BIT */
-        return (~cpsr) & PSR_C_BIT;
-}
-
-static unsigned long __kprobes __check_ge(unsigned long cpsr)
-{
-        cpsr ^= (cpsr << 3); /* PSR_N_BIT ^= PSR_V_BIT */
-        return (~cpsr) & PSR_N_BIT;
-}
-
-static unsigned long __kprobes __check_lt(unsigned long cpsr)
-{
-        cpsr ^= (cpsr << 3); /* PSR_N_BIT ^= PSR_V_BIT */
-        return cpsr & PSR_N_BIT;
-}
-
-static unsigned long __kprobes __check_gt(unsigned long cpsr)
-{
-        unsigned long temp = cpsr ^ (cpsr << 3); /* PSR_N_BIT ^= PSR_V_BIT */
-        temp |= (cpsr << 1);                     /* PSR_N_BIT |= PSR_Z_BIT */
-        return (~temp) & PSR_N_BIT;
-}
-
-static unsigned long __kprobes __check_le(unsigned long cpsr)
-{
-        unsigned long temp = cpsr ^ (cpsr << 3); /* PSR_N_BIT ^= PSR_V_BIT */
-        temp |= (cpsr << 1);                     /* PSR_N_BIT |= PSR_Z_BIT */
-        return temp & PSR_N_BIT;
-}
-
-static unsigned long __kprobes __check_al(unsigned long cpsr)
-{
-        return true;
-}
-
-static kprobe_check_cc * const condition_checks[16] = {
-        &__check_eq, &__check_ne, &__check_cs, &__check_cc,
-        &__check_mi, &__check_pl, &__check_vs, &__check_vc,
-        &__check_hi, &__check_ls, &__check_ge, &__check_lt,
-        &__check_gt, &__check_le, &__check_al, &__check_al
-};
-
 /* Return:
  *   INSN_REJECTED     If instruction is one not allowed to kprobe,
  *   INSN_GOOD         If instruction is supported and uses instruction slot,
@@ -1628,7 +1538,7 @@ static kprobe_check_cc * const condition_checks[16] = {
 enum kprobe_insn __kprobes
 arm_kprobe_decode_insn(kprobe_opcode_t insn, struct arch_specific_insn *asi)
 {
-        asi->insn_check_cc = condition_checks[insn>>28];
+        asi->insn_check_cc = kprobe_condition_checks[insn>>28];
         asi->insn[1] = KPROBE_RETURN_INSTRUCTION;
 
         if ((insn & 0xf0000000) == 0xf0000000)