From daa39a220492433a138ce359f2afcf91f2ff48b6 Mon Sep 17 00:00:00 2001
From: Tim Newsome <tim@sifive.com>
Date: Mon, 14 Mar 2016 11:54:29 -0700
Subject: Implement register writes.

---
 tests/gdbserver-smoke.py | 41 ++++++++++++++++++++++++++++++++++++-----
 tests/testlib.py         | 14 ++++++++++++--
 2 files changed, 48 insertions(+), 7 deletions(-)

(limited to 'tests')

diff --git a/tests/gdbserver-smoke.py b/tests/gdbserver-smoke.py
index 770e77a..9d04915 100755
--- a/tests/gdbserver-smoke.py
+++ b/tests/gdbserver-smoke.py
@@ -6,13 +6,12 @@ import unittest
 import tempfile
 import time
 
-class SmokeTest(unittest.TestCase):
+class DebugTest(unittest.TestCase):
     def setUp(self):
-        self.tmpf = tempfile.NamedTemporaryFile()
-        testlib.compile("debug.c", self.tmpf.name)
-        self.spike = testlib.spike(self.tmpf.name, halted=False)
+        self.binary = testlib.compile("debug.c")
+        self.spike = testlib.spike(self.binary, halted=False)
         self.gdb = testlib.Gdb()
-        self.gdb.command("file %s" % self.tmpf.name)
+        self.gdb.command("file %s" % self.binary)
         self.gdb.command("target extended-remote localhost:9824")
         self.gdb.command("p i=0");
 
@@ -62,5 +61,37 @@ class SmokeTest(unittest.TestCase):
             last_time = time
             self.gdb.command("stepi")
 
+class RegsTest(unittest.TestCase):
+    def setUp(self):
+        self.binary = testlib.compile("regs.s")
+        self.spike = testlib.spike(self.binary, halted=False)
+        self.gdb = testlib.Gdb()
+        self.gdb.command("file %s" % self.binary)
+        self.gdb.command("target extended-remote localhost:9824")
+
+    def tearDown(self):
+        self.spike.kill()
+        self.spike.wait()
+
+    def test_write_gprs(self):
+        # Note a0 is missing from this list since it's used to hold the
+        # address.
+        regs = ("ra", "sp", "gp", "tp", "t0", "t1", "t2", "fp", "s1",
+                "a1", "a2", "a3", "a4", "a5", "a6", "a7", "s2", "s3", "s4",
+                "s5", "s6", "s7", "s8", "s9", "s10", "s11", "t3", "t4", "t5",
+                "t6")
+
+        self.gdb.command("p $pc=write_regs")
+        for i, r in enumerate(regs):
+            self.gdb.command("p $%s=%d" % (r, i*0xdeadbeef+17))
+        self.gdb.command("p $a0=data")
+        self.gdb.command("b all_done")
+        output = self.gdb.command("c")
+        self.assertIn("Breakpoint 1", output)
+
+        for n in range(len(regs)):
+            self.assertEqual(self.gdb.x("data+%d" % (8*n), 'g'),
+                    n*0xdeadbeef+17)
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/tests/testlib.py b/tests/testlib.py
index 04acbfc..0c1713c 100644
--- a/tests/testlib.py
+++ b/tests/testlib.py
@@ -15,10 +15,15 @@ def find_file(path):
             return fullpath
     raise ValueError("Couldn't find %r." % path)
 
-def compile(src, dst):
+def compile(src):
     """Compile a single .c file into a binary."""
+    src = find_file(src)
+    dst = os.path.splitext(src)[0]
     cc = os.path.expandvars("$RISCV/bin/riscv64-unknown-elf-gcc")
-    return os.system("%s -g -o %s %s" % (cc, dst, find_file(src)))
+    cmd = "%s -g -o %s %s" % (cc, dst, src)
+    result = os.system(cmd)
+    assert result == 0, "%r failed" % cmd
+    return dst
 
 def spike(binary, halted=False):
     cmd = [find_file("spike")]
@@ -46,3 +51,8 @@ class Gdb(object):
         self.child.expect("\n")
         self.child.expect("\(gdb\)")
         return self.child.before.strip()
+
+    def x(self, address, size='w'):
+        output = self.command("x/%s %s" % (size, address))
+        value = int(output.split(':')[1].strip())
+        return value
-- 
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