1 files changed, 66 insertions, 0 deletions
diff --git a/showtrace.py b/showtrace.py
new file mode 100644
index 0000000..a5d1021
--- /dev/null
+++ b/showtrace.py
@@ -0,0 +1,66 @@
+#!/usr/bin/env python3
+
+import sys, re, subprocess
+
+trace_filename = sys.argv[1]
+elf_filename = sys.argv[2]
+
+insns = dict()
+
+with subprocess.Popen(["riscv32-unknown-elf-objdump", "-d", elf_filename], stdout=subprocess.PIPE) as proc:
+    while True:
+        line = proc.stdout.readline().decode("ascii")
+        if line == '': break
+        match = re.match(r'^\s*([0-9a-f]+):\s+([0-9a-f]+)\s*(.*)', line)
+        if match: insns[int(match.group(1), 16)] = (int(match.group(2), 16), match.group(3).replace("\t", " "))
+
+with open(trace_filename, "r") as f:
+    pc = -1
+    last_irq = False
+    for line in f:
+        raw_data = int(line.replace("x", "0"), 16)
+        payload = raw_data & 0xffffffff
+        irq_active = (raw_data & 0x800000000) != 0
+        is_addr = (raw_data & 0x200000000) != 0
+        is_branch = (raw_data & 0x100000000) != 0
+        info = "%s %s%08x" % ("IRQ" if irq_active or last_irq else "   ",
+                ">" if is_branch else "@" if is_addr else "=", payload)
+
+        if irq_active and not last_irq:
+            pc = 0x10
+
+        if pc >= 0:
+            if pc in insns:
+                insn_opcode, insn_desc = insns[pc]
+                opname = insn_desc.split()[0]
+
+                if insn_opcode == 0x0400000b:
+                    insn_desc = "retirq"
+                    opname = "retirq"
+
+                if is_branch and opname not in ["j", "jal", "jr", "jalr", "ret", "retirq",
+                        "beq", "bne", "blt", "ble", "bge", "bgt", "bltu", "bleu", "bgeu", "bgtu",
+                        "beqz", "bnez", "blez", "bgez", "bltz", "bgtz"]:
+                    print("%s ** UNEXPECTED BRANCH DATA FOR INSN AT %08x! **" % (info, pc))
+
+                if is_addr and opname not in ["lb", "lh", "lw", "lbu", "lhu", "sb", "sh", "sw"]:
+                    print("%s ** UNEXPECTED ADDR DATA FOR INSN AT %08x! **" % (info, pc))
+
+                opcode_fmt = "%08x" if (insn_opcode & 3) == 3 else "    %04x"
+                print(("%s | %08x | " + opcode_fmt + " | %s") % (info, pc, insn_opcode, insn_desc))
+                if not is_addr:
+                    pc += 4 if (insn_opcode & 3) == 3 else 2
+            else:
+                print("%s ** NO INFORMATION ON INSN AT %08x! **" % (info, pc))
+                pc = -1
+        else:
+            if is_branch:
+                print("%s ** FOUND BRANCH AND STARTING DECODING **" % info)
+            else:
+                print("%s ** SKIPPING DATA UNTIL NEXT BRANCH **" % info)
+
+        if is_branch:
+            pc = payload
+
+        last_irq = irq_active
+