LoongArch: ptrace: Add hardware single step support

[platform/kernel/linux-rpi.git] / arch / loongarch / include / asm / inst.h

diff --git a/arch/loongarch/include/asm/inst.h b/arch/loongarch/include/asm/inst.h
index 7eedd83..36cc5eb 100644 (file)
--- a/arch/loongarch/include/asm/inst.h
+++ b/arch/loongarch/include/asm/inst.h
@@ -351,6 +351,44 @@ static inline bool is_stack_alloc_ins(union loongarch_instruction *ip)
                is_imm12_negative(ip->reg2i12_format.immediate);
 }
 
+static inline bool is_self_loop_ins(union loongarch_instruction *ip, struct pt_regs *regs)
+{
+       switch (ip->reg0i26_format.opcode) {
+       case b_op:
+       case bl_op:
+               if (ip->reg0i26_format.immediate_l == 0
+                   && ip->reg0i26_format.immediate_h == 0)
+                       return true;
+       }
+
+       switch (ip->reg1i21_format.opcode) {
+       case beqz_op:
+       case bnez_op:
+       case bceqz_op:
+               if (ip->reg1i21_format.immediate_l == 0
+                   && ip->reg1i21_format.immediate_h == 0)
+                       return true;
+       }
+
+       switch (ip->reg2i16_format.opcode) {
+       case beq_op:
+       case bne_op:
+       case blt_op:
+       case bge_op:
+       case bltu_op:
+       case bgeu_op:
+               if (ip->reg2i16_format.immediate == 0)
+                       return true;
+               break;
+       case jirl_op:
+               if (regs->regs[ip->reg2i16_format.rj] +
+                   ((unsigned long)ip->reg2i16_format.immediate << 2) == (unsigned long)ip)
+                       return true;
+       }
+
+       return false;
+}
+
 int larch_insn_read(void *addr, u32 *insnp);
 int larch_insn_write(void *addr, u32 insn);
 int larch_insn_patch_text(void *addr, u32 insn);