//
//===----------------------------------------------------------------------===//
-#include "llvm/Target/TargetAsmBackend.h"
#include "ARM.h"
+#include "ARMAddressingModes.h"
#include "ARMFixupKinds.h"
#include "llvm/ADT/Twine.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetAsmBackend.h"
#include "llvm/Target/TargetRegistry.h"
using namespace llvm;
unsigned getPointerSize() const {
return 4;
}
-
-protected:
- static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
- switch (Kind) {
- default:
- llvm_unreachable("Unknown fixup kind!");
- case FK_Data_4:
- case ARM::fixup_arm_movt_hi16:
- case ARM::fixup_arm_movw_lo16:
- return Value;
- case ARM::fixup_arm_pcrel_12: {
- bool isAdd = true;
- // ARM PC-relative values are offset by 8.
- Value -= 8;
- if ((int64_t)Value < 0) {
- Value = -Value;
- isAdd = false;
- }
- assert ((Value < 4096) && "Out of range pc-relative fixup value!");
- Value |= isAdd << 23;
- return Value;
- }
- case ARM::fixup_arm_branch:
- // These values don't encode the low two bits since they're always zero.
- // Offset by 8 just as above.
- return (Value - 8) >> 2;
- case ARM::fixup_arm_vfp_pcrel_12: {
- // Offset by 8 just as above.
- Value = Value - 8;
- bool isAdd = true;
- if ((int64_t)Value < 0) {
- Value = -Value;
- isAdd = false;
- }
- // These values don't encode the low two bits since they're always zero.
- Value >>= 2;
- assert ((Value < 256) && "Out of range pc-relative fixup value!");
- Value |= isAdd << 23;
- return Value;
- }
- }
- }
};
} // end anonymous namespace
return true;
}
+static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
+ switch (Kind) {
+ default:
+ llvm_unreachable("Unknown fixup kind!");
+ case FK_Data_4:
+ return Value;
+ case ARM::fixup_arm_movt_hi16:
+ case ARM::fixup_arm_movw_lo16: {
+ unsigned Hi4 = (Value & 0xF000) >> 12;
+ unsigned Lo12 = Value & 0x0FFF;
+ // inst{19-16} = Hi4;
+ // inst{11-0} = Lo12;
+ Value = (Hi4 << 16) | (Lo12);
+ return Value;
+ }
+ case ARM::fixup_arm_ldst_pcrel_12: {
+ bool isAdd = true;
+ // ARM PC-relative values are offset by 8.
+ Value -= 8;
+ if ((int64_t)Value < 0) {
+ Value = -Value;
+ isAdd = false;
+ }
+ assert ((Value < 4096) && "Out of range pc-relative fixup value!");
+ Value |= isAdd << 23;
+ return Value;
+ }
+ case ARM::fixup_arm_adr_pcrel_12: {
+ // ARM PC-relative values are offset by 8.
+ Value -= 8;
+ unsigned opc = 4; // bits {24-21}. Default to add: 0b0100
+ if ((int64_t)Value < 0) {
+ Value = -Value;
+ opc = 2; // 0b0010
+ }
+ assert(ARM_AM::getSOImmVal(Value) != -1 &&
+ "Out of range pc-relative fixup value!");
+ // Encode the immediate and shift the opcode into place.
+ return ARM_AM::getSOImmVal(Value) | (opc << 21);
+ }
+ case ARM::fixup_arm_branch:
+ // These values don't encode the low two bits since they're always zero.
+ // Offset by 8 just as above.
+ return 0xFFFFFF & ((Value - 8) >> 2);
+ case ARM::fixup_arm_pcrel_10: {
+ // Offset by 8 just as above.
+ Value = Value - 8;
+ bool isAdd = true;
+ if ((int64_t)Value < 0) {
+ Value = -Value;
+ isAdd = false;
+ }
+ // These values don't encode the low two bits since they're always zero.
+ Value >>= 2;
+ assert ((Value < 256) && "Out of range pc-relative fixup value!");
+ Value |= isAdd << 23;
+ return Value;
+ }
+ }
+}
+
namespace {
// FIXME: This should be in a separate file.
// ELF is an ELF of course...
return Format;
}
- void ApplyFixup(const MCFixup &Fixup, MCDataFragment &DF,
+ void ApplyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
uint64_t Value) const;
MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
}
};
-// Fixme: can we raise this to share code between Darwin and ELF?
-void ELFARMAsmBackend::ApplyFixup(const MCFixup &Fixup, MCDataFragment &DF,
- uint64_t Value) const {
- uint32_t Mask = 0;
+// Fixme: Raise this to share code between Darwin and ELF.
+void ELFARMAsmBackend::ApplyFixup(const MCFixup &Fixup, char *Data,
+ unsigned DataSize, uint64_t Value) const {
// Fixme: 2 for Thumb
- int NumBytes = 4;
+ unsigned NumBytes = 4;
Value = adjustFixupValue(Fixup.getKind(), Value);
- switch (Fixup.getKind()) {
- default: assert(0 && "Unsupported Fixup kind"); break;
- case ARM::fixup_arm_branch: {
- unsigned Lo24 = Value & 0xFFFFFF;
- Mask = ~(0xFFFFFF);
- Value = Lo24;
- }; break;
- case ARM::fixup_arm_movt_hi16:
- case ARM::fixup_arm_movw_lo16: {
- unsigned Hi4 = (Value & 0xF000) >> 12;
- unsigned Lo12 = Value & 0x0FFF;
- // inst{19-16} = Hi4;
- // inst{11-0} = Lo12;
- Value = (Hi4 << 16) | (Lo12);
- Mask = ~(0xF0FFF);
- }; break;
- }
-
assert((Fixup.getOffset() % NumBytes == 0)
&& "Offset mod NumBytes is nonzero!");
// For each byte of the fragment that the fixup touches, mask in the
// bits from the fixup value.
// The Value has been "split up" into the appropriate bitfields above.
- // Fixme: how to share code with the .td generated code?
for (unsigned i = 0; i != NumBytes; ++i) {
- DF.getContents()[Fixup.getOffset() + i] &= uint8_t(Mask >> (i * 8));
- DF.getContents()[Fixup.getOffset() + i] |= uint8_t(Value >> (i * 8));
+ Data[Fixup.getOffset() + i] |= uint8_t(Value >> (i * 8));
}
}
return Format;
}
- void ApplyFixup(const MCFixup &Fixup, MCDataFragment &DF,
+ void ApplyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
uint64_t Value) const;
MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
switch (Kind) {
default: llvm_unreachable("Unknown fixup kind!");
case FK_Data_4: return 4;
- case ARM::fixup_arm_pcrel_12: return 3;
- case ARM::fixup_arm_vfp_pcrel_12: return 3;
+ case ARM::fixup_arm_ldst_pcrel_12: return 3;
+ case ARM::fixup_arm_pcrel_10: return 3;
+ case ARM::fixup_arm_adr_pcrel_12: return 3;
case ARM::fixup_arm_branch: return 3;
}
}
-void DarwinARMAsmBackend::ApplyFixup(const MCFixup &Fixup, MCDataFragment &DF,
- uint64_t Value) const {
+void DarwinARMAsmBackend::ApplyFixup(const MCFixup &Fixup, char *Data,
+ unsigned DataSize, uint64_t Value) const {
unsigned NumBytes = getFixupKindNumBytes(Fixup.getKind());
Value = adjustFixupValue(Fixup.getKind(), Value);
- assert(Fixup.getOffset() + NumBytes <= DF.getContents().size() &&
+ assert(Fixup.getOffset() + NumBytes <= DataSize &&
"Invalid fixup offset!");
// For each byte of the fragment that the fixup touches, mask in the
// bits from the fixup value.
for (unsigned i = 0; i != NumBytes; ++i)
- DF.getContents()[Fixup.getOffset() + i] |= uint8_t(Value >> (i * 8));
+ Data[Fixup.getOffset() + i] |= uint8_t(Value >> (i * 8));
}
} // end anonymous namespace
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