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[SystemZ] Add support for fentry.

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SystemZAsmPrinter now properly emits function calls to __fentry__.

Review: Ulrich Weigand
llvm-svn: 370743
This commit is contained in:
Jonas Paulsson 2019-09-03 11:21:12 +00:00
parent dbd4d84623
commit e89d1ea35f
3 changed files with 44 additions and 0 deletions
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14
lib/Target/SystemZ/SystemZAsmPrinter.cpp
View File

@ -501,6 +501,10 @@ void SystemZAsmPrinter::EmitInstruction(const MachineInstr *MI) {
}
break;
case TargetOpcode::FENTRY_CALL:
LowerFENTRY_CALL(*MI, Lower);
return;
case TargetOpcode::STACKMAP:
LowerSTACKMAP(*MI);
return;
@ -546,6 +550,16 @@ static unsigned EmitNop(MCContext &OutContext, MCStreamer &OutStreamer,
}
}
void SystemZAsmPrinter::LowerFENTRY_CALL(const MachineInstr &MI,
SystemZMCInstLower &Lower) {
MCContext &Ctx = MF->getContext();
MCSymbol *fentry = Ctx.getOrCreateSymbol("__fentry__");
const MCSymbolRefExpr *Op =
MCSymbolRefExpr::create(fentry, MCSymbolRefExpr::VK_PLT, Ctx);
OutStreamer->EmitInstruction(MCInstBuilder(SystemZ::BRASL)
.addReg(SystemZ::R0D).addExpr(Op), getSubtargetInfo());
}
void SystemZAsmPrinter::LowerSTACKMAP(const MachineInstr &MI) {
const SystemZInstrInfo *TII =
static_cast<const SystemZInstrInfo *>(MF->getSubtarget().getInstrInfo());

1
lib/Target/SystemZ/SystemZAsmPrinter.h
View File

@ -46,6 +46,7 @@ public:
}
private:
void LowerFENTRY_CALL(const MachineInstr &MI, SystemZMCInstLower &MCIL);
void LowerSTACKMAP(const MachineInstr &MI);
void LowerPATCHPOINT(const MachineInstr &MI, SystemZMCInstLower &Lower);
};

29
test/CodeGen/SystemZ/fentry-insertion.ll Normal file
View File

@ -0,0 +1,29 @@
; RUN: llc %s -mtriple=s390x-linux-gnu -mcpu=z10 -o - -verify-machineinstrs \
; RUN: | FileCheck %s
define void @test1() #0 {
entry:
ret void
; CHECK-LABEL: @test1
; CHECK: brasl %r0, __fentry__
; CHECK-NOT: mcount
; CHECK: br %r14
}
define void @test2() #1 {
entry:
br label %bb1
bb1:
call void @address_taken(i64 ptrtoint (i8* blockaddress(@test2, %bb1) to i64), i32 512)
ret void
; CHECK-LABEL: @test2
; CHECK: brasl %r0, __fentry__
; CHECK-NOT: mcount
; CHECK: br %r14
}
declare void @address_taken(i64, i32) local_unnamed_addr
attributes #0 = { "fentry-call"="true" }
attributes #1 = { inlinehint minsize noredzone nounwind optsize sspstrong "fentry-call"="true" }