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| author | Andrew Waterman <waterman@eecs.berkeley.edu> | 2012-08-01 22:55:02 -0700 |
|---|---|---|
| committer | Andrew Waterman <waterman@eecs.berkeley.edu> | 2012-08-01 22:55:02 -0700 |
| commit | b3d3f82d4e38f2712d5ccf9c69051137ec5fca76 (patch) | |
| tree | 88e233dfe5c1456745d96c359bc0f3165338dfcf | |
| parent | 07d126d57ede2d3c7e28fddd08338b2171f884bb (diff) | |
| download | spike-b3d3f82d4e38f2712d5ccf9c69051137ec5fca76.zip spike-b3d3f82d4e38f2712d5ccf9c69051137ec5fca76.tar.gz spike-b3d3f82d4e38f2712d5ccf9c69051137ec5fca76.tar.bz2 | |
new tohost/fromhost semantics
| -rw-r--r-- | riscv/insns/mtpcr.h | 3 | ||||
| -rw-r--r-- | riscv/processor.cc | 2 |
2 files changed, 2 insertions, 3 deletions
diff --git a/riscv/insns/mtpcr.h b/riscv/insns/mtpcr.h index 5cd0134..9b0beba 100644 --- a/riscv/insns/mtpcr.h +++ b/riscv/insns/mtpcr.h @@ -1,4 +1,5 @@ require_supervisor; reg_t val = get_pcr(insn.rtype.rs1); -set_pcr(insn.rtype.rs1, RS2); +if (val == 0 || insn.rtype.rs1 != PCR_TOHOST) + set_pcr(insn.rtype.rs1, RS2); RD = val; diff --git a/riscv/processor.cc b/riscv/processor.cc index c116575..070ec15 100644 --- a/riscv/processor.cc +++ b/riscv/processor.cc @@ -271,12 +271,10 @@ void processor_t::set_pcr(int which, reg_t val) vecbanks_count = __builtin_popcountll(vecbanks); break; case PCR_TOHOST: - fromhost = 0; tohost = val; break; case PCR_FROMHOST: fromhost = val; - tohost = 0; break; } } |