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| author | Simon Atanasyan <simon@atanasyan.com> | 2019-09-09 17:28:45 +0000 |
|---|---|---|
| committer | Simon Atanasyan <simon@atanasyan.com> | 2019-09-09 17:28:45 +0000 |
| commit | 56e4ea2bff9eb2f43b20a68951e6263ad3c9022f (patch) | |
| tree | ec3c3ee002fa9d837cff383978526c9a18f643f2 /llvm/lib/Target/Mips/Disassembler/MipsDisassembler.cpp | |
| parent | d2a9516a6d08c3edd7c5484f4d10f4b38b48c9d6 (diff) | |
| download | llvm-56e4ea2bff9eb2f43b20a68951e6263ad3c9022f.zip llvm-56e4ea2bff9eb2f43b20a68951e6263ad3c9022f.tar.gz llvm-56e4ea2bff9eb2f43b20a68951e6263ad3c9022f.tar.bz2 | |
[mips] Fix decoding of microMIPS JALX instruction
microMIPS jump and link exchange instruction stores a target in a
26-bits field. Despite other microMIPS JAL instructions these bits
are target address shifted right 2 bits [1]. The patch fixes the
JALX instruction decoding and uses 2-bit shift.
[1] MIPS Architecture for Programmers Volume II-B: The microMIPS32 Instruction Set
Differential Revision: https://reviews.llvm.org/D67320
llvm-svn: 371428
Diffstat (limited to 'llvm/lib/Target/Mips/Disassembler/MipsDisassembler.cpp')
| -rw-r--r-- | llvm/lib/Target/Mips/Disassembler/MipsDisassembler.cpp | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/llvm/lib/Target/Mips/Disassembler/MipsDisassembler.cpp b/llvm/lib/Target/Mips/Disassembler/MipsDisassembler.cpp index ef13507..c3e98fe 100644 --- a/llvm/lib/Target/Mips/Disassembler/MipsDisassembler.cpp +++ b/llvm/lib/Target/Mips/Disassembler/MipsDisassembler.cpp @@ -267,6 +267,13 @@ static DecodeStatus DecodeJumpTargetMM(MCInst &Inst, uint64_t Address, const void *Decoder); +// DecodeJumpTargetXMM - Decode microMIPS jump and link exchange target, +// which is shifted left by 2 bit. +static DecodeStatus DecodeJumpTargetXMM(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder); + static DecodeStatus DecodeMem(MCInst &Inst, unsigned Insn, uint64_t Address, @@ -2291,6 +2298,15 @@ static DecodeStatus DecodeJumpTargetMM(MCInst &Inst, return MCDisassembler::Success; } +static DecodeStatus DecodeJumpTargetXMM(MCInst &Inst, + unsigned Insn, + uint64_t Address, + const void *Decoder) { + unsigned JumpOffset = fieldFromInstruction(Insn, 0, 26) << 2; + Inst.addOperand(MCOperand::createImm(JumpOffset)); + return MCDisassembler::Success; +} + static DecodeStatus DecodeAddiur2Simm7(MCInst &Inst, unsigned Value, uint64_t Address, |