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[AVR] Enable the '__do_copy_data' function

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Also enables '__do_clear_bss'.

These functions are automaticalled called by the CRT if they are
declared.

We need these to be called otherwise RAM will start completely
uninitialised, even though we need to copy RAM variables from progmem to
RAM.

llvm-svn: 312905
This commit is contained in:
Dylan McKay 2017-09-11 10:32:51 +00:00
parent 3f42dd4a6f
commit 880b08eb60
4 changed files with 32 additions and 0 deletions
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20
lib/Target/AVR/MCTargetDesc/AVRTargetStreamer.cpp
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@ -13,6 +13,8 @@
#include "AVRTargetStreamer.h"
#include "llvm/MC/MCContext.h"
namespace llvm {
AVRTargetStreamer::AVRTargetStreamer(MCStreamer &S) : MCTargetStreamer(S) {}
@ -20,5 +22,23 @@ AVRTargetStreamer::AVRTargetStreamer(MCStreamer &S) : MCTargetStreamer(S) {}
AVRTargetAsmStreamer::AVRTargetAsmStreamer(MCStreamer &S)
: AVRTargetStreamer(S) {}
void AVRTargetStreamer::finish() {
MCStreamer &OS = getStreamer();
MCContext &Context = OS.getContext();
MCSymbol *DoCopyData = Context.getOrCreateSymbol("__do_copy_data");
MCSymbol *DoClearBss = Context.getOrCreateSymbol("__do_clear_bss");
// FIXME: We can disable __do_copy_data if there are no static RAM variables.
OS.emitRawComment(" Declaring this symbol tells the CRT that it should");
OS.emitRawComment("copy all variables from program memory to RAM on startup");
OS.EmitSymbolAttribute(DoCopyData, MCSA_Global);
OS.emitRawComment(" Declaring this symbol tells the CRT that it should");
OS.emitRawComment("clear the zeroed data section on startup");
OS.EmitSymbolAttribute(DoClearBss, MCSA_Global);
}
} // end namespace llvm

2
lib/Target/AVR/MCTargetDesc/AVRTargetStreamer.h
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@ -19,6 +19,8 @@ class MCStreamer;
class AVRTargetStreamer : public MCTargetStreamer {
public:
explicit AVRTargetStreamer(MCStreamer &S);
void finish() override;
};
/// A target streamer for textual AVR assembly code.

5
test/CodeGen/AVR/clear-bss.ll Normal file
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@ -0,0 +1,5 @@
; RUN: llc < %s -march=avr | FileCheck %s
; CHECK: .globl __do_clear_bss
@zeroed = internal constant [3 x i8] zeroinitializer

5
test/CodeGen/AVR/copy-data-to-ram.ll Normal file
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@ -0,0 +1,5 @@
; RUN: llc < %s -march=avr | FileCheck %s
; CHECK: .globl __do_copy_data
@str = internal global [3 x i8] c"foo"