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#!/usr/bin/python
import os
import testlib
import unittest
import tempfile
import time
import random
import binascii
class DeleteSpike(unittest.TestCase):
def tearDown(self):
del self.spike
class InstantHaltTest(DeleteSpike):
def setUp(self):
self.binary = testlib.compile("debug.c")
self.spike = testlib.Spike(self.binary, halted=True)
self.gdb = testlib.Gdb()
self.gdb.command("file %s" % self.binary)
self.gdb.command("target extended-remote localhost:%d" % self.spike.port)
def test_instant_halt(self):
self.assertEqual(0x1000, self.gdb.p("$pc"))
# For some reason instret resets to 0.
self.assertLess(self.gdb.p("$instret"), 8)
self.gdb.command("stepi")
self.assertNotEqual(0x1000, self.gdb.p("$pc"))
def test_change_pc(self):
"""Change the PC right as we come out of reset."""
# 0x13 is nop
self.gdb.command("p *((int*) 0x80000000)=0x13")
self.gdb.command("p *((int*) 0x80000004)=0x13")
self.gdb.command("p *((int*) 0x80000008)=0x13")
self.gdb.command("p $pc=0x80000000")
self.gdb.command("stepi")
self.assertEqual(0x80000004, self.gdb.p("$pc"))
self.gdb.command("stepi")
self.assertEqual(0x80000008, self.gdb.p("$pc"))
class DebugTest(DeleteSpike):
def setUp(self):
self.binary = testlib.compile("debug.c")
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:%d" % self.spike.port)
def test_turbostep(self):
"""Single step a bunch of times."""
self.gdb.command("p i=0");
last_pc = None
for _ in range(100):
self.gdb.command("stepi")
pc = self.gdb.command("p $pc")
self.assertNotEqual(last_pc, pc)
last_pc = pc
def test_exit(self):
self.gdb.command("p i=0");
output = self.gdb.command("c")
self.assertIn("Continuing", output)
self.assertIn("Remote connection closed", output)
def test_breakpoint(self):
self.gdb.command("p i=0");
self.gdb.command("b print_row")
# The breakpoint should be hit exactly 10 times.
for i in range(10):
output = self.gdb.command("c")
self.assertIn("Continuing", output)
self.assertIn("length=%d" % i, output)
self.assertIn("Breakpoint 1", output)
output = self.gdb.command("c")
self.assertIn("Continuing", output)
self.assertIn("Remote connection closed", output)
def test_registers(self):
self.gdb.command("p i=0");
# Try both forms to test gdb.
for cmd in ("info all-registers", "info registers all"):
output = self.gdb.command(cmd)
self.assertNotIn("Could not", output)
for reg in ('zero', 'ra', 'sp', 'gp', 'tp'):
self.assertIn(reg, output)
# mcpuid is one of the few registers that should have the high bit set
# (for rv64).
# Leave this commented out until gdb and spike agree on the encoding of
# mcpuid (which is going to be renamed to misa in any case).
#self.assertRegexpMatches(output, ".*mcpuid *0x80")
# The instret register should always be changing.
last_instret = None
for _ in range(5):
instret = self.gdb.p("$instret")
self.assertNotEqual(instret, last_instret)
last_instret = instret
self.gdb.command("stepi")
def test_interrupt(self):
"""Sending gdb ^C while the program is running should cause it to halt."""
self.gdb.c(wait=False)
time.sleep(0.1)
self.gdb.interrupt()
self.gdb.command("p i=123");
self.gdb.c(wait=False)
time.sleep(0.1)
self.gdb.interrupt()
self.gdb.command("p i=0");
output = self.gdb.c()
self.assertIn("Continuing", output)
self.assertIn("Remote connection closed", output)
class RegsTest(DeleteSpike):
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:%d" % self.spike.port)
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, (0xdeadbeef<<i)+17))
self.gdb.command("p $a0=data")
self.gdb.command("b all_done")
output = self.gdb.command("c")
self.assertIn("Breakpoint 1", output)
# Just to get this data in the log.
self.gdb.command("x/30gx data")
self.gdb.command("info registers")
for n in range(len(regs)):
self.assertEqual(self.gdb.x("data+%d" % (8*n), 'g'),
(0xdeadbeef<<n)+17)
def test_write_csrs(self):
# As much a test of gdb as of the simulator.
self.gdb.p("$mscratch=0")
self.gdb.stepi()
self.assertEqual(self.gdb.p("$mscratch"), 0)
self.gdb.p("$mscratch=123")
self.gdb.stepi()
self.assertEqual(self.gdb.p("$mscratch"), 123)
self.gdb.command("p $fflags=9")
self.gdb.command("p $pc=write_regs")
self.gdb.command("p $a0=data")
self.gdb.command("b all_done")
self.gdb.command("c")
self.assertEqual(9, self.gdb.p("$fflags"))
self.assertEqual(9, self.gdb.p("$x1"))
self.assertEqual(9, self.gdb.p("$csr1"))
class DownloadTest(DeleteSpike):
def setUp(self):
length = 2**20
fd = file("data.c", "w")
fd.write("#include <stdint.h>\n")
fd.write("uint32_t length = %d;\n" % length)
fd.write("uint8_t d[%d] = {\n" % length)
self.crc = 0
for i in range(length / 16):
fd.write(" /* 0x%04x */ " % (i * 16));
for _ in range(16):
value = random.randrange(1<<8)
fd.write("%d, " % value)
self.crc = binascii.crc32("%c" % value, self.crc)
fd.write("\n");
fd.write("};\n");
fd.write("uint8_t *data = &d[0];\n");
fd.close()
self.binary = testlib.compile("checksum.c", "data.c", "start.S",
"-mcmodel=medany",
"-T", "standalone.lds",
"-nostartfiles"
)
self.spike = testlib.Spike(None, halted=True)
self.gdb = testlib.Gdb()
self.gdb.command("file %s" % self.binary)
self.gdb.command("target extended-remote localhost:%d" % self.spike.port)
def test_download(self):
output = self.gdb.command("load")
self.assertNotIn("failed", output)
self.assertIn("Transfer rate", output)
self.gdb.command("b done")
self.gdb.c()
result = self.gdb.p("$a0")
self.assertEqual(self.crc, result)
class MprvTest(DeleteSpike):
def setUp(self):
self.binary = testlib.compile("mprv.S", "-T", "standalone.lds",
"-nostartfiles")
self.spike = testlib.Spike(None, halted=True)
self.gdb = testlib.Gdb()
self.gdb.command("file %s" % self.binary)
self.gdb.command("target extended-remote localhost:%d" % self.spike.port)
self.gdb.command("load")
def test_mprv(self):
"""Test that the debugger can access memory when MPRV is set."""
self.gdb.c(wait=False)
self.gdb.interrupt()
output = self.gdb.command("p/x *(int*)(((char*)&data)-0x80000000)")
self.assertIn("0xbead", output)
if __name__ == '__main__':
# TROUBLESHOOTING TIPS
# If a particular test fails, run just that one test, eg.:
# ./tests/gdbserver.py MprvTest.test_mprv
# Then inspect gdb.log and spike.log to see what happened in more detail.
unittest.main()
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