Added tracer support (under construction)

1 files changed, 50 insertions, 0 deletions

diff --git a/showtrace.py b/showtrace.py
new file mode 100644
index 0000000..56c91ff
--- /dev/null
+++ b/showtrace.py
@@ -0,0 +1,50 @@
+#!/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+(\S+)\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
+
+        if irq_active and not last_irq:
+            pc = 0x10
+
+        if pc >= 0:
+            if pc in insns:
+                insn_opcode, insn_desc = insns[pc]
+                opcode_fmt = "%08x" if (insn_opcode & 3) == 3 else "    %04x"
+                print(("%s %s%08x | %08x | " + opcode_fmt + " | %s") % ("IRQ" if irq_active else "   ",
+                        ">" if is_branch else "@" if is_addr else "=", payload, pc, insn_opcode, insn_desc))
+                if not is_addr:
+                    pc += 4 if (insn_opcode & 3) == 3 else 2
+            else:
+                print("%s %s%08x ** NO INFORMATION ON INSN AT %08x! **" % ("IRQ" if irq_active else "   ",
+                        ">" if is_branch else "@" if is_addr else "=", payload, pc))
+                pc = -1
+        else:
+            print("%s %s%08x ** SKIPPING DATA UNTIL NEXT BRANCH **" % ("IRQ" if irq_active else "   ",
+                    ">" if is_branch else "@" if is_addr else "=", payload))
+
+        if is_branch:
+            pc = payload
+
+        last_irq = irq_active
+