util: Get rid of spike-dasm in favor of llvm-mc

iis-setup.sh

@@ -25,11 +25,3 @@ rm -rf tmp
 
 # Install local packages in editable mode.
 pip install -e .
-
-# Install spike-dasm
-mkdir tools/
-cd tools/
-wget https://raw.githubusercontent.com/pulp-platform/riscv-isa-sim/snitch/iis-install-spike-dasm.sh
-chmod +x iis-install-spike-dasm.sh && ./iis-install-spike-dasm.sh && rm iis-install-spike-dasm.sh
-cd -
-export PATH=$(pwd)/tools:$PATH

target/common/common.mk

@@ -21,7 +21,6 @@ VERILATOR_SEPP ?=
 
 # External executables
 BENDER       ?= bender
-DASM         ?= spike-dasm
 VLT          ?= $(VERILATOR_SEPP) verilator
 VCS          ?= $(VCS_SEPP) vcs
 VERIBLE_FMT  ?= verible-verilog-format
@@ -228,7 +227,7 @@ clean-visual-trace:
 	rm -f $(VISUAL_TRACE)
 
 $(addprefix $(LOGS_DIR)/,trace_hart_%.txt hart_%_perf.json dma_%_perf.json): $(LOGS_DIR)/trace_hart_%.dasm $(GENTRACE_PY)
-	$(DASM) < $< | $(GENTRACE_PY) --permissive --dma-trace $(SIM_DIR)/dma_trace_$*_00000.log --dump-hart-perf $(LOGS_DIR)/hart_$*_perf.json --dump-dma-perf $(LOGS_DIR)/dma_$*_perf.json -o $(LOGS_DIR)/trace_hart_$*.txt
+	$(GENTRACE_PY) < $< --permissive --dma-trace $(SIM_DIR)/dma_trace_$*_00000.log --dump-hart-perf $(LOGS_DIR)/hart_$*_perf.json --dump-dma-perf $(LOGS_DIR)/dma_$*_perf.json -o $(LOGS_DIR)/trace_hart_$*.txt
 
 # Generate source-code interleaved traces for all harts. Reads the binary from
 # the logs/.rtlbinary file that is written at start of simulation in the vsim script

util/trace/gen_trace.py

@@ -36,19 +36,23 @@
 import sys
 import re
 import argparse
+import subprocess
 import json
 import ast
 from ctypes import c_int32, c_uint32
 from collections import deque, defaultdict
 from pathlib import Path
 import traceback
 from itertools import tee, islice, chain
+from functools import lru_cache
 
 EXTRA_WB_WARN = 'WARNING: {} transactions still in flight for {}.'
 
 GENERAL_WARN = """WARNING: Inconsistent final state; performance metrics
 may be inaccurate. Is this trace complete?\n"""
 
+DASM_IN_REGEX = r'DASM\(([0-9a-fA-F]+)\)'
+
 TRACE_IN_REGEX = r'(\d+)\s+(\d+)\s+(\d+)\s+(0x[0-9A-Fa-fz]+)\s+([^#;]*)(\s*#;\s*(.*))?'
 
 TRACE_OUT_FMT = '{:>8} {:>8} {:>8} {:>10} {:<30}'
@@ -351,6 +355,25 @@ def load_opcodes():
             _cached_opcodes[insn_name] = vec_params
 
 
+@lru_cache
+def disasm_inst(hex_inst, mc_exec="llvm-mc", mc_flags="-mcpu=snitch"):
+    """Disassemble a single RISC-V instruction using llvm-mc."""
+    # Reverse the endianness of the hex instruction
+    inst_fmt = " ".join(
+        [f"0x{hex_inst[i:i+2]}" for i in range(0, len(hex_inst), 2)][::-1]
+    )
+
+    # Use llvm-mc to disassemble the binary instruction
+    result = subprocess.run(
+        f"echo {inst_fmt} | {mc_exec} -disassemble {mc_flags}",
+        shell=True,
+        capture_output=True,
+    )
+
+    # Extract disassembled instruction from llvm-mc output
+    return result.stdout.decode().splitlines()[-1].strip()
+
+
 def flt_op_vlen(insn: str, op_type: str) -> int:
     """Get the vector length of a floating-point instruction operand.
 
@@ -883,6 +906,8 @@ def annotate_insn(
     fseq_info:
     dict,  # Info on the sequencer to properly map tunneled instruction PCs
     perf_metrics: list,  # A list performance metric dicts
+    mc_exec: str, # Path to the llvm-mc executable
+    mc_flags: str,  # Flags to pass to the llvm-mc executable
     dupl_time_info:
     bool = True,  # Show sim time and cycle again if same as previous line?
     last_time_info:
@@ -894,7 +919,14 @@ def annotate_insn(
     dma_trans: list = []
 ) -> (str, tuple, bool
       ):  # Return time info, whether trace line contains no info, and fseq_len
-    match = re.search(TRACE_IN_REGEX, line.strip('\n'))
+
+    # Disassemble instruction
+    line = re.sub(
+        DASM_IN_REGEX,
+        disasm_inst(re.findall(DASM_IN_REGEX, line)[0], mc_exec, mc_flags),
+        line,
+    )
+    match = re.search(TRACE_IN_REGEX, line.strip("\n"))
     if match is None:
         raise ValueError('Not a valid trace line:\n{}'.format(line))
     time_str, cycle_str, priv_lvl, pc_str, insn, _, extras_str = match.groups()
@@ -1057,7 +1089,7 @@ def main():
     # Argument parsing and iterator creation
     parser = argparse.ArgumentParser()
     parser.add_argument(
-        'infile',
+        '--infile',
         metavar='infile.dasm',
         nargs='?',
         type=argparse.FileType('r'),
@@ -1104,6 +1136,16 @@ def main():
         '--dump-dma-perf',
         help='Dump DMA performance metrics as json text.'
     )
+    parser.add_argument(
+        '--llvm-mc-exec',
+        default='llvm-mc',
+        help='Path to the llvm-mc executable'
+    )
+    parser.add_argument(
+        '--llvm-mc-flags',
+        default='-mcpu=snitch',
+        help='Flags to pass to the llvm-mc executable'
+    )
 
     args = parser.parse_args()
     line_iter = iter(args.infile.readline, b'')
@@ -1130,9 +1172,21 @@ def main():
             if line:
                 try:
                     ann_insn, time_info, empty = annotate_insn(
-                        line, gpr_wb_info, fpr_wb_info, fseq_info, perf_metrics, False,
-                        time_info, args.offl, not args.saddr, args.permissive, dma_trans)
-                    if perf_metrics[0]['start'] is None:
+                        line,
+                        gpr_wb_info,
+                        fpr_wb_info,
+                        fseq_info,
+                        perf_metrics,
+                        args.llvm_mc_exec,
+                        args.llvm_mc_flags,
+                        False,
+                        time_info,
+                        args.offl,
+                        not args.saddr,
+                        args.permissive,
+                        dma_trans,
+                    )
+                    if perf_metrics[0]["start"] is None:
                         perf_metrics[0]['tstart'] = time_info[0] / 1000
                         perf_metrics[0]['start'] = time_info[1]
                     if not empty:
@@ -1142,7 +1196,7 @@ def main():
                     if not nextl:
                         message += 'last line. Did the simulation terminate?'
                     else:
-                        message += 'line {lineno}.'
+                        message += f'line {lineno}.'
                     print(traceback.format_exc(), file=sys.stderr)
                     print(message, file=sys.stderr)
                     return 1