debug: Add CeaseStepiTest.

Test that we work correctly when the hart we're debugging ceases to
respond during stepi.

Add wait parameter to Gdb.stepi(), in case stepi isn't expected to complete.
Parse "could not read registers" error from gdb

1 files changed, 14 insertions, 3 deletions

diff --git a/debug/testlib.py b/debug/testlib.py
index 5c78bd7..58bb23e 100644
--- a/debug/testlib.py
+++ b/debug/testlib.py
@@ -476,6 +476,11 @@ class CouldNotFetch(Exception):
         self.regname = regname
         self.explanation = explanation
 
+class CouldNotReadRegisters(Exception):
+    def __init__(self, explanation):
+        Exception.__init__(self)
+        self.explanation = explanation
+
 class NoSymbol(Exception):
     def __init__(self, symbol):
         Exception.__init__(self)
@@ -508,6 +513,8 @@ def tokenize(text):
                 (r"<repeats (\d+) times>", lambda m: Repeat(int(m.group(1)))),
                 (r"Could not fetch register \"(\w+)\"; (.*)$",
                     lambda m: CouldNotFetch(m.group(1), m.group(2))),
+                (r"Could not read registers; (.*)$",
+                    lambda m: CouldNotReadRegisters(m.group(1))),
                 (r"Cannot access memory at address (0x[0-9a-f]+)",
                     lambda m: CannotAccess(int(m.group(1), 0))),
                 (r"Cannot insert breakpoint (\d+).",
@@ -857,9 +864,13 @@ class Gdb:
                 result[name] = parse_rhs(parts[1])
         return result
 
-    def stepi(self):
-        output = self.command("stepi", ops=10)
-        return output
+    def stepi(self, wait=True):
+        if wait:
+            return self.command("stepi", ops=10)
+        else:
+            self.active_child.sendline("stepi")
+            self.active_child.expect("stepi", timeout=self.timeout)
+            return ""
 
     def expect(self, text, ops=1):
         return self.active_child.expect(text, timeout=ops * self.timeout)