From 5bbdb190412a55436b808cfa59820b1e6cf08db0 Mon Sep 17 00:00:00 2001
From: Bill Schmidt <wschmidt@linux.vnet.ibm.com>
Date: Tue, 14 May 2013 19:35:45 +0000
Subject: [PATCH] Implement the PowerPC system call (sc) instruction.

Instruction added at request of Roman Divacky.  Tested via asm-parser.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181821 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/PowerPC/PPCISelLowering.cpp |  1 +
 lib/Target/PowerPC/PPCISelLowering.h   |  4 ++++
 lib/Target/PowerPC/PPCInstrFormats.td  | 13 +++++++++++++
 lib/Target/PowerPC/PPCInstrInfo.td     | 10 ++++++++++
 test/MC/PowerPC/ppc64-encoding.s       |  3 ++-
 5 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp
index f6972bdd6c0..eee2bb87def 100644
--- a/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -666,6 +666,7 @@ const char *PPCTargetLowering::getTargetNodeName(unsigned Opcode) const {
   case PPCISD::ADDIS_DTPREL_HA: return "PPCISD::ADDIS_DTPREL_HA";
   case PPCISD::ADDI_DTPREL_L:   return "PPCISD::ADDI_DTPREL_L";
   case PPCISD::VADD_SPLAT:      return "PPCISD::VADD_SPLAT";
+  case PPCISD::SC:              return "PPCISD::SC";
   }
 }
 
diff --git a/lib/Target/PowerPC/PPCISelLowering.h b/lib/Target/PowerPC/PPCISelLowering.h
index b219de38d5d..6df09a07442 100644
--- a/lib/Target/PowerPC/PPCISelLowering.h
+++ b/lib/Target/PowerPC/PPCISelLowering.h
@@ -238,6 +238,10 @@ namespace llvm {
       /// optimizations due to constant folding.
       VADD_SPLAT,
 
+      /// CHAIN = SC CHAIN, Imm128 - System call.  The 7-bit unsigned
+      /// operand identifies the operating system entry point.
+      SC,
+
       /// CHAIN = STBRX CHAIN, GPRC, Ptr, Type - This is a
       /// byte-swapping store instruction.  It byte-swaps the low "Type" bits of
       /// the GPRC input, then stores it through Ptr.  Type can be either i16 or
diff --git a/lib/Target/PowerPC/PPCInstrFormats.td b/lib/Target/PowerPC/PPCInstrFormats.td
index b6f4e852154..a24405851c2 100644
--- a/lib/Target/PowerPC/PPCInstrFormats.td
+++ b/lib/Target/PowerPC/PPCInstrFormats.td
@@ -145,6 +145,19 @@ class BForm_2<bits<6> opcode, bits<5> bo, bits<5> bi, bit aa, bit lk,
   let Inst{31}    = lk;
 }
 
+// 1.7.3 SC-Form
+class SCForm<bits<6> opcode, bits<1> xo,
+                     dag OOL, dag IOL, string asmstr, InstrItinClass itin,
+                     list<dag> pattern>
+  : I<opcode, OOL, IOL, asmstr, itin> {
+  bits<7>  LEV;
+
+  let Pattern = pattern;
+
+  let Inst{20-26} = LEV;
+  let Inst{30}    = xo;
+}
+
 // 1.7.4 D-Form
 class DForm_base<bits<6> opcode, dag OOL, dag IOL, string asmstr,
                  InstrItinClass itin, list<dag> pattern> 
diff --git a/lib/Target/PowerPC/PPCInstrInfo.td b/lib/Target/PowerPC/PPCInstrInfo.td
index 4763069f25a..9c39b34ab07 100644
--- a/lib/Target/PowerPC/PPCInstrInfo.td
+++ b/lib/Target/PowerPC/PPCInstrInfo.td
@@ -162,6 +162,10 @@ def PPCeh_sjlj_longjmp : SDNode<"PPCISD::EH_SJLJ_LONGJMP",
                                 SDTypeProfile<0, 1, [SDTCisPtrTy<0>]>,
                                 [SDNPHasChain, SDNPSideEffect]>;
 
+def SDT_PPCsc     : SDTypeProfile<0, 1, [SDTCisInt<0>]>;
+def PPCsc         : SDNode<"PPCISD::SC", SDT_PPCsc,
+                           [SDNPHasChain, SDNPSideEffect]>;
+
 def PPCvcmp       : SDNode<"PPCISD::VCMP" , SDT_PPCvcmp, []>;
 def PPCvcmp_o     : SDNode<"PPCISD::VCMPo", SDT_PPCvcmp, [SDNPOutGlue]>;
 
@@ -987,6 +991,12 @@ let isBranch = 1, isTerminator = 1 in {
                         "#EH_SjLj_Setup\t$dst", []>;
 }
 
+// System call.
+let PPC970_Unit = 7 in {
+  def SC     : SCForm<17, 1, (outs), (ins i32imm:$lev),
+                      "sc $lev", BrB, [(PPCsc (i32 imm:$lev))]>;
+}
+
 // DCB* instructions.
 def DCBA   : DCB_Form<758, 0, (outs), (ins memrr:$dst),
                       "dcba $dst", LdStDCBF, [(int_ppc_dcba xoaddr:$dst)]>,
diff --git a/test/MC/PowerPC/ppc64-encoding.s b/test/MC/PowerPC/ppc64-encoding.s
index dda79606384..a955f4f8070 100644
--- a/test/MC/PowerPC/ppc64-encoding.s
+++ b/test/MC/PowerPC/ppc64-encoding.s
@@ -41,7 +41,8 @@
 
 # System call instruction
 
-# FIXME: sc 1
+# CHECK: sc 1                            # encoding: [0x44,0x00,0x00,0x22]
+         sc 1
 
 # Fixed-point facility
 
-- 
2.34.1