[mips] Add support for .cpload.
Summary:
This directive is used for setting up $gp in the beginning of a function.
It expands to three instructions if PIC is enabled:
lui $gp, %hi(_gp_disp)
addui $gp, $gp, %lo(_gp_disp)
addu $gp, $gp, $reg
_gp_disp is a special symbol that the linker sets to the distance between
the lui instruction and the context pointer (_gp).
Reviewers: dsanders
Reviewed By: dsanders
Differential Revision: http://reviews.llvm.org/D3480
llvm-svn: 207637
diff --git a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
index 4bc681b..4449cc2 100644
--- a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
+++ b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
@@ -137,6 +137,7 @@
SmallVectorImpl<MCInst> &Instructions, bool isLoad,
bool isImmOpnd);
bool reportParseError(StringRef ErrorMsg);
+ bool reportParseError(SMLoc Loc, StringRef ErrorMsg);
bool parseMemOffset(const MCExpr *&Res, bool isParenExpr);
bool parseRelocOperand(const MCExpr *&Res);
@@ -145,6 +146,7 @@
bool isEvaluated(const MCExpr *Expr);
bool parseSetFeature(uint64_t Feature);
+ bool parseDirectiveCPLoad(SMLoc Loc);
bool parseDirectiveCPSetup();
bool parseDirectiveNaN();
bool parseDirectiveSet();
@@ -2083,6 +2085,10 @@
return Error(Loc, ErrorMsg);
}
+bool MipsAsmParser::reportParseError(SMLoc Loc, StringRef ErrorMsg) {
+ return Error(Loc, ErrorMsg);
+}
+
bool MipsAsmParser::parseSetNoAtDirective() {
// Line should look like: ".set noat".
// set at reg to 0.
@@ -2301,6 +2307,30 @@
return true;
}
+bool MipsAsmParser::parseDirectiveCPLoad(SMLoc Loc) {
+ if (Options.isReorder())
+ Warning(Loc, ".cpload in reorder section");
+
+ // FIXME: Warn if cpload is used in Mips16 mode.
+
+ SmallVector<MCParsedAsmOperand *, 1> Reg;
+ OperandMatchResultTy ResTy = ParseAnyRegister(Reg);
+ if (ResTy == MatchOperand_NoMatch || ResTy == MatchOperand_ParseFail) {
+ reportParseError("expected register containing function address");
+ return false;
+ }
+
+ MipsOperand *RegOpnd = static_cast<MipsOperand *>(Reg[0]);
+ if (!RegOpnd->isGPRAsmReg()) {
+ reportParseError(RegOpnd->getStartLoc(), "invalid register");
+ return false;
+ }
+
+ getTargetStreamer().emitDirectiveCpload(RegOpnd->getGPR32Reg());
+ delete RegOpnd;
+ return false;
+}
+
bool MipsAsmParser::parseDirectiveCPSetup() {
unsigned FuncReg;
unsigned Save;
@@ -2550,6 +2580,8 @@
bool MipsAsmParser::ParseDirective(AsmToken DirectiveID) {
StringRef IDVal = DirectiveID.getString();
+ if (IDVal == ".cpload")
+ return parseDirectiveCPLoad(DirectiveID.getLoc());
if (IDVal == ".dword") {
parseDataDirective(8, DirectiveID.getLoc());
return false;