arch/mips/kernel/probes-common.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Copyright (C) 2016 Imagination Technologies
   4  * Author: Marcin Nowakowski <marcin.nowakowski@mips.com>
   5  */
   6
   7 #ifndef __PROBES_COMMON_H
   8 #define __PROBES_COMMON_H
   9
  10 #include <asm/inst.h>
  11
  12 int __insn_is_compact_branch(union mips_instruction insn);
  13
  14 static inline int __insn_has_delay_slot(const union mips_instruction insn)
  15 {
  16         switch (insn.i_format.opcode) {
  17         /*
  18          * jr and jalr are in r_format format.
  19          */
  20         case spec_op:
  21                 switch (insn.r_format.func) {
  22                 case jalr_op:
  23                 case jr_op:
  24                         return 1;
  25                 }
  26                 break;
  27
  28         /*
  29          * This group contains:
  30          * bltz_op, bgez_op, bltzl_op, bgezl_op,
  31          * bltzal_op, bgezal_op, bltzall_op, bgezall_op.
  32          */
  33         case bcond_op:
  34                 switch (insn.i_format.rt) {
  35                 case bltz_op:
  36                 case bltzl_op:
  37                 case bgez_op:
  38                 case bgezl_op:
  39                 case bltzal_op:
  40                 case bltzall_op:
  41                 case bgezal_op:
  42                 case bgezall_op:
  43                 case bposge32_op:
  44                         return 1;
  45                 }
  46                 break;
  47
  48         /*
  49          * These are unconditional and in j_format.
  50          */
  51         case jal_op:
  52         case j_op:
  53         case beq_op:
  54         case beql_op:
  55         case bne_op:
  56         case bnel_op:
  57         case blez_op: /* not really i_format */
  58         case blezl_op:
  59         case bgtz_op:
  60         case bgtzl_op:
  61                 return 1;
  62
  63         /*
  64          * And now the FPA/cp1 branch instructions.
  65          */
  66         case cop1_op:
  67 #ifdef CONFIG_CPU_CAVIUM_OCTEON
  68         case lwc2_op: /* This is bbit0 on Octeon */
  69         case ldc2_op: /* This is bbit032 on Octeon */
  70         case swc2_op: /* This is bbit1 on Octeon */
  71         case sdc2_op: /* This is bbit132 on Octeon */
  72 #endif
  73                 return 1;
  74         }
  75
  76         return 0;
  77 }
  78
  79 #endif  /* __PROBES_COMMON_H */