Add support for Mips break and syscall insructions. The corresponding test cases are added.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185999 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 49 insertions, 0 deletions

diff --git a/lib/Target/Mips/MipsInstrFormats.td b/lib/Target/Mips/MipsInstrFormats.td
index 14cfcf9..6073476 100644
--- a/lib/Target/Mips/MipsInstrFormats.td
+++ b/lib/Target/Mips/MipsInstrFormats.td
@@ -491,6 +491,34 @@ class TEQ_FM<bits<6> funct> {
 }
 
 //===----------------------------------------------------------------------===//
+//  System calls format <op|code_|funct>
+//===----------------------------------------------------------------------===//
+
+class SYS_FM<bits<6> funct>
+{
+  bits<20> code_;
+  bits<32> Inst;
+  let Inst{31-26} = 0x0;
+  let Inst{25-6} = code_;
+  let Inst{5-0}  = funct;
+}
+
+//===----------------------------------------------------------------------===//
+//  Break instruction format <op|code_1|funct>
+//===----------------------------------------------------------------------===//
+
+class BRK_FM<bits<6> funct>
+{
+  bits<10> code_1;
+  bits<10> code_2;
+  bits<32> Inst;
+  let Inst{31-26} = 0x0;
+  let Inst{25-16} = code_1;
+  let Inst{15-6}  = code_2;
+  let Inst{5-0}   = funct;
+}
+
+//===----------------------------------------------------------------------===//
 //
 //  FLOATING POINT INSTRUCTION FORMATS
 //
diff --git a/lib/Target/Mips/MipsInstrInfo.td b/lib/Target/Mips/MipsInstrInfo.td
index d2164f7..712e204 100644
--- a/lib/Target/Mips/MipsInstrInfo.td
+++ b/lib/Target/Mips/MipsInstrInfo.td
@@ -250,6 +250,12 @@ def simm16      : Operand<i32> {
 def simm20      : Operand<i32> {
 }
 
+def uimm20      : Operand<i32> {
+}
+
+def uimm10      : Operand<i32> {
+}
+
 def simm16_64   : Operand<i64>;
 def shamt       : Operand<i32>;
 
@@ -637,6 +643,14 @@ class BAL_FT :
   let hasDelaySlot = 1;
   let Defs = [RA];
 }
+// Syscall
+class SYS_FT<string opstr> :
+  InstSE<(outs), (ins uimm20:$code_),
+         !strconcat(opstr, "\t$code_"), [], NoItinerary, FrmI>;
+// Break
+class BRK_FT<string opstr> :
+  InstSE<(outs), (ins uimm10:$code_1, uimm10:$code_2),
+         !strconcat(opstr, "\t$code_1, $code_2"), [], NoItinerary, FrmOther>;
 
 // Sync
 let hasSideEffects = 1 in
@@ -941,6 +955,9 @@ defm SWR : StoreLeftRightM<"swr", MipsSWR, CPURegs>, LW_FM<0x2e>;
 def SYNC : SYNC_FT, SYNC_FM;
 def TEQ : TEQ_FT<"teq", CPURegsOpnd>, TEQ_FM<0x34>;
 
+def BREAK : BRK_FT<"break">, BRK_FM<0xd>;
+def SYSCALL : SYS_FT<"syscall">, SYS_FM<0xc>;
+
 /// Load-linked, Store-conditional
 let Predicates = [NotN64, HasStdEnc] in {
   def LL : LLBase<"ll", CPURegsOpnd, mem>, LW_FM<0x30>;
@@ -1119,6 +1136,10 @@ def : InstAlias<"bnez $rs,$offset",
 def : InstAlias<"beqz $rs,$offset",
                  (BEQ CPURegsOpnd:$rs, ZERO, brtarget:$offset), 1>,
                  Requires<[NotMips64]>;
+def : InstAlias<"syscall", (SYSCALL 0), 1>;
+
+def : InstAlias<"break $imm", (BREAK uimm10:$imm, 0), 1>;
+def : InstAlias<"break", (BREAK 0, 0), 1>;
 //===----------------------------------------------------------------------===//
 // Assembler Pseudo Instructions
 //===----------------------------------------------------------------------===//