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Mips ELF: Mark object file as ABI compliant
When producing objects that are abi compliant we are marking neither the object file nor the assembly file correctly and thus generate warnings. We need to set the EF_CPIC flag in the ELF header when generating direct object. Note that the warning is only generated when compiling without PIC. When compiling with clang the warning will be suppressed by supplying: -Wa,-mno-shared -Wa,-call_nonpic Also the following directive should also be added: .option pic0 when compiling without PIC, This eliminates the need for supplying: -mno-shared -call_nonpic on the assembler command line. Patch by Douglas Gilmore git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184220 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -36,6 +36,10 @@ namespace llvm {
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MCAssembler& MCA = getAssembler();
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unsigned EFlags = MCA.getELFHeaderEFlags();
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// TODO: Need to add -mabicalls and -mno-abicalls flags.
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// Currently we assume that -mabicalls is the default.
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EFlags |= ELF::EF_MIPS_CPIC;
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if (Subtarget.inMips16Mode())
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EFlags |= ELF::EF_MIPS_ARCH_ASE_M16;
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else
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@ -557,6 +557,15 @@ printFCCOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
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void MipsAsmPrinter::EmitStartOfAsmFile(Module &M) {
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// FIXME: Use SwitchSection.
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// TODO: Need to add -mabicalls and -mno-abicalls flags.
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// Currently we assume that -mabicalls is the default.
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if (OutStreamer.hasRawTextSupport()) {
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OutStreamer.EmitRawText(StringRef("\t.abicalls"));
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Reloc::Model RM = Subtarget->getRelocationModel();
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if (RM == Reloc::Static)
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OutStreamer.EmitRawText(StringRef("\t.option\tpic0"));
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}
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// Tell the assembler which ABI we are using
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if (OutStreamer.hasRawTextSupport())
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OutStreamer.EmitRawText("\t.section .mdebug." +
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13
test/MC/Mips/abicalls.ll
Normal file
13
test/MC/Mips/abicalls.ll
Normal file
@ -0,0 +1,13 @@
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;
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; When the assembler is ready a .s file for it will
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; be created.
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; Note that EF_MIPS_CPIC is set by -mabicalls which is the default on Linux
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; TODO need to support -mno-abicalls
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; RUN: llc -filetype=asm -mtriple mipsel-unknown-linux -mcpu=mips32 -relocation-model=static %s -o - | FileCheck -check-prefix=CHECK-STATIC %s
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; RUN: llc -filetype=asm -mtriple mipsel-unknown-linux -mcpu=mips32 %s -o - | FileCheck -check-prefix=CHECK-PIC %s
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; CHECK-STATIC: .abicalls
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; CHECK-STATIC-NEXT: pic0
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; CHECK-PIC: .abicalls
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; CHECK-PIC-NOT: pic0
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@ -6,13 +6,16 @@
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; EF_MIPS_NOREORDER (0x00000001) is always on by default currently
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; EF_MIPS_PIC (0x00000002)
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; EF_MIPS_CPIC (0x00000004) - not tested yet
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; EF_MIPS_CPIC (0x00000004) - See note below
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; EF_MIPS_ABI2 (0x00000020) - n32 not tested yet
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; EF_MIPS_ARCH_32 (0x50000000)
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; EF_MIPS_ARCH_64 (0x60000000)
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; EF_MIPS_ARCH_32R2 (0x70000000)
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; EF_MIPS_ARCH_64R2 (0x80000000)
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; Note that EF_MIPS_CPIC is set by -mabicalls which is the default on Linux
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; TODO need to support -mno-abicalls
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; RUN: llc -filetype=obj -mtriple mipsel-unknown-linux -mcpu=mips32 -relocation-model=static %s -o - | llvm-readobj -h | FileCheck -check-prefix=CHECK-BE32 %s
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; RUN: llc -filetype=obj -mtriple mipsel-unknown-linux -mcpu=mips32 %s -o - | llvm-readobj -h | FileCheck -check-prefix=CHECK-BE32_PIC %s
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; RUN: llc -filetype=obj -mtriple mipsel-unknown-linux -mcpu=mips32r2 -relocation-model=static %s -o - | llvm-readobj -h | FileCheck -check-prefix=CHECK-BE32R2 %s
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@ -28,37 +31,37 @@
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; RUN: llc -filetype=obj -mtriple mipsel-unknown-linux -mcpu=mips32r2 -mattr=+mips16 -relocation-model=pic %s -o - | llvm-readobj -h | FileCheck -check-prefix=CHECK-LE32R2-MIPS16 %s
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; 32(R1) bit with NO_REORDER and static
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; CHECK-BE32: Flags [ (0x50001001)
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; CHECK-BE32: Flags [ (0x50001005)
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;
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; 32(R1) bit with NO_REORDER and PIC
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; CHECK-BE32_PIC: Flags [ (0x50001003)
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; CHECK-BE32_PIC: Flags [ (0x50001007)
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;
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; 32R2 bit with NO_REORDER and static
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; CHECK-BE32R2: Flags [ (0x70001001)
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; CHECK-BE32R2: Flags [ (0x70001005)
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;
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; 32R2 bit with NO_REORDER and PIC
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; CHECK-BE32R2_PIC: Flags [ (0x70001003)
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; CHECK-BE32R2_PIC: Flags [ (0x70001007)
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;
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; 32R2 bit MICROMIPS with NO_REORDER and static
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; CHECK-BE32R2-MICROMIPS: Flags [ (0x72001001)
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; CHECK-BE32R2-MICROMIPS: Flags [ (0x72001005)
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;
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; 32R2 bit MICROMIPS with NO_REORDER and PIC
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;CHECK-BE32R2-MICROMIPS_PIC: Flags [ (0x72001003)
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;CHECK-BE32R2-MICROMIPS_PIC: Flags [ (0x72001007)
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;
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; 64(R1) bit with NO_REORDER and static
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; CHECK-BE64: Flags [ (0x60000001)
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; CHECK-BE64: Flags [ (0x60000005)
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;
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; 64(R1) bit with NO_REORDER and PIC
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; CHECK-BE64_PIC: Flags [ (0x60000003)
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; CHECK-BE64_PIC: Flags [ (0x60000007)
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;
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; 64R2 bit with NO_REORDER and static
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; CHECK-BE64R2: Flags [ (0x80000001)
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; CHECK-BE64R2: Flags [ (0x80000005)
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;
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; 64R2 bit with NO_REORDER and PIC
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; CHECK-BE64R2_PIC: Flags [ (0x80000003)
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; CHECK-BE64R2_PIC: Flags [ (0x80000007)
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;
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; 32R2 bit MIPS16 with PIC
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; CHECK-LE32R2-MIPS16: Flags [ (0x74001002)
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; CHECK-LE32R2-MIPS16: Flags [ (0x74001006)
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define i32 @main() nounwind {
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entry:
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