debug/gdbserver.py

   1 #!/usr/bin/python
   2
   3 import os
   4 import sys
   5 import argparse
   6 import testlib
   7 import unittest
   8 import tempfile
   9 import time
  10 import random
  11 import binascii
  12
  13 def ihex_line(address, record_type, data):
  14     assert len(data) < 128
  15     line = ":%02X%04X%02X" % (len(data), address, record_type)
  16     check = len(data)
  17     check += address % 256
  18     check += address >> 8
  19     check += record_type
  20     for char in data:
  21         value = ord(char)
  22         check += value
  23         line += "%02X" % value
  24     line += "%02X\n" % ((256-check)%256)
  25     return line
  26
  27 def ihex_parse(line):
  28     assert line.startswith(":")
  29     line = line[1:]
  30     data_len = int(line[:2], 16)
  31     address = int(line[2:6], 16)
  32     record_type = int(line[6:8], 16)
  33     data = ""
  34     for i in range(data_len):
  35         data += "%c" % int(line[8+2*i:10+2*i], 16)
  36     return record_type, address, data
  37
  38 class DeleteServer(unittest.TestCase):
  39     def tearDown(self):
  40         del self.server
  41
  42 class SimpleRegisterTest(DeleteServer):
  43     def setUp(self):
  44         self.server = target.server()
  45         self.gdb = testlib.Gdb()
  46         self.gdb.command("target extended-remote localhost:%d" % self.server.port)
  47
  48         # 0x13 is nop
  49         self.gdb.command("p *((int*) 0x%x)=0x13" % target.ram)
  50         self.gdb.command("p *((int*) 0x%x)=0x13" % (target.ram + 4))
  51         self.gdb.command("p *((int*) 0x%x)=0x13" % (target.ram + 8))
  52         self.gdb.p("$pc=0x%x" % target.ram)
  53
  54     def check_reg(self, name):
  55         a = random.randrange(1<<target.xlen)
  56         b = random.randrange(1<<target.xlen)
  57         self.gdb.p("$%s=0x%x" % (name, a))
  58         self.gdb.stepi()
  59         self.assertEqual(self.gdb.p("$%s" % name), a)
  60         self.gdb.p("$%s=0x%x" % (name, b))
  61         self.gdb.stepi()
  62         self.assertEqual(self.gdb.p("$%s" % name), b)
  63
  64     def test_s0(self):
  65         # S0 is saved/restored in DSCRATCH
  66         self.check_reg("s0")
  67
  68     def test_s1(self):
  69         # S1 is saved/restored in Debug RAM
  70         self.check_reg("s1")
  71
  72     def test_t0(self):
  73         # T0 is not saved/restored at all
  74         self.check_reg("t2")
  75
  76     def test_t2(self):
  77         # T2 is not saved/restored at all
  78         self.check_reg("t2")
  79
  80 class SimpleMemoryTest(DeleteServer):
  81     def setUp(self):
  82         self.server = target.server()
  83         self.gdb = testlib.Gdb()
  84         self.gdb.command("target extended-remote localhost:%d" % self.server.port)
  85
  86     def access_test(self, size, data_type):
  87         a = 0x86753095555aaaa & ((1<<(size*8))-1)
  88         b = 0xdeadbeef12345678 & ((1<<(size*8))-1)
  89         self.gdb.p("*((%s*)0x%x) = 0x%x" % (data_type, target.ram, a))
  90         self.gdb.p("*((%s*)0x%x) = 0x%x" % (data_type, target.ram + size, b))
  91         self.assertEqual(self.gdb.p("*((%s*)0x%x)" % (data_type, target.ram)), a)
  92         self.assertEqual(self.gdb.p("*((%s*)0x%x)" % (data_type, target.ram + size)), b)
  93
  94     def test_8(self):
  95         self.access_test(1, 'char')
  96
  97     def test_16(self):
  98         self.access_test(2, 'short')
  99
 100     def test_32(self):
 101         self.access_test(4, 'long')
 102
 103     def test_64(self):
 104         self.access_test(8, 'long long')
 105
 106     def test_block(self):
 107         length = 1024
 108         line_length = 16
 109         fd = file("write.ihex", "w")
 110         data = ""
 111         for i in range(length / line_length):
 112             line_data = "".join(["%c" % random.randrange(256) for _ in range(line_length)])
 113             data += line_data
 114             fd.write(ihex_line(i * line_length, 0, line_data))
 115         fd.close()
 116
 117         self.gdb.command("restore write.ihex 0x%x" % target.ram)
 118         for offset in range(0, length, 19*4) + [length-4]:
 119             value = self.gdb.p("*((long*)0x%x)" % (target.ram + offset))
 120             written = ord(data[offset]) | \
 121                     (ord(data[offset+1]) << 8) | \
 122                     (ord(data[offset+2]) << 16) | \
 123                     (ord(data[offset+3]) << 24)
 124             self.assertEqual(value, written)
 125
 126         self.gdb.command("dump ihex memory read.ihex 0x%x 0x%x" % (target.ram,
 127             target.ram + length))
 128         for line in file("read.ihex"):
 129             record_type, address, line_data = ihex_parse(line)
 130             if (record_type == 0):
 131                 self.assertEqual(line_data, data[address:address+len(line_data)])
 132
 133 class InstantHaltTest(DeleteServer):
 134     def setUp(self):
 135         self.server = target.server()
 136         self.gdb = testlib.Gdb()
 137         self.gdb.command("target extended-remote localhost:%d" % self.server.port)
 138
 139     def test_instant_halt(self):
 140         self.assertEqual(0x1000, self.gdb.p("$pc"))
 141         # For some reason instret resets to 0.
 142         self.assertLess(self.gdb.p("$instret"), 8)
 143         self.gdb.stepi()
 144         self.assertNotEqual(0x1000, self.gdb.p("$pc"))
 145
 146     def test_change_pc(self):
 147         """Change the PC right as we come out of reset."""
 148         # 0x13 is nop
 149         self.gdb.command("p *((int*) 0x%x)=0x13" % target.ram)
 150         self.gdb.command("p *((int*) 0x%x)=0x13" % (target.ram + 4))
 151         self.gdb.command("p *((int*) 0x%x)=0x13" % (target.ram + 8))
 152         self.gdb.p("$pc=0x%x" % target.ram)
 153         self.gdb.stepi()
 154         self.assertEqual((target.ram + 4), self.gdb.p("$pc"))
 155         self.gdb.stepi()
 156         self.assertEqual((target.ram + 8), self.gdb.p("$pc"))
 157
 158 class DebugTest(DeleteServer):
 159     def setUp(self):
 160         # Include malloc so that gdb can make function calls. I suspect this
 161         # malloc will silently blow through the memory set aside for it, so be
 162         # careful.
 163         self.binary = target.compile("programs/debug.c", "programs/checksum.c",
 164                 "programs/tiny-malloc.c", "-DDEFINE_MALLOC", "-DDEFINE_FREE")
 165         self.server = target.server()
 166         self.gdb = testlib.Gdb()
 167         self.gdb.command("file %s" % self.binary)
 168         self.gdb.command("target extended-remote localhost:%d" % self.server.port)
 169         self.gdb.load()
 170         self.gdb.b("_exit")
 171
 172     def exit(self):
 173         output = self.gdb.c()
 174         self.assertIn("Breakpoint", output)
 175         #TODO self.assertIn("_exit", output)
 176         #TODO self.assertEqual(self.gdb.p("status"), 0xc86455d4)
 177         # Use a0 until gdb can resolve "status"
 178         self.assertEqual(self.gdb.p("$a0") & 0xffffffff, 0xc86455d4)
 179
 180     def test_function_call(self):
 181         text = "Howdy, Earth!"
 182         gdb_length = self.gdb.p('strlen("%s")' % text)
 183         self.assertEqual(gdb_length, len(text))
 184         self.exit()
 185
 186     def test_turbostep(self):
 187         """Single step a bunch of times."""
 188         self.gdb.command("p i=0");
 189         last_pc = None
 190         advances = 0
 191         jumps = 0
 192         for _ in range(100):
 193             self.gdb.stepi()
 194             pc = self.gdb.p("$pc")
 195             self.assertNotEqual(last_pc, pc)
 196             if (last_pc and pc > last_pc and pc - last_pc <= 4):
 197                 advances += 1
 198             else:
 199                 jumps += 1
 200             last_pc = pc
 201         # Some basic sanity that we're not running between breakpoints or
 202         # something.
 203         self.assertGreater(jumps, 10)
 204         self.assertGreater(advances, 50)
 205
 206     def test_exit(self):
 207         self.exit()
 208
 209     def test_symbols(self):
 210         self.gdb.b("main")
 211         self.gdb.b("rot13")
 212         output = self.gdb.c()
 213         self.assertIn(", main ", output)
 214         output = self.gdb.c()
 215         self.assertIn(", rot13 ", output)
 216
 217     def test_breakpoint(self):
 218         self.gdb.b("rot13")
 219         # The breakpoint should be hit exactly 2 times.
 220         for i in range(2):
 221             output = self.gdb.c()
 222             self.gdb.p("$pc")
 223             self.assertIn("Breakpoint ", output)
 224             #TODO self.assertIn("rot13 ", output)
 225         self.exit()
 226
 227     def test_hwbp_1(self):
 228         self.gdb.hbreak("rot13")
 229         # The breakpoint should be hit exactly 2 times.
 230         for i in range(2):
 231             output = self.gdb.c()
 232             self.gdb.p("$pc")
 233             self.assertIn("Breakpoint ", output)
 234             #TODO self.assertIn("rot13 ", output)
 235         self.exit()
 236
 237     def test_hwbp_2(self):
 238         self.gdb.hbreak("main")
 239         self.gdb.hbreak("rot13")
 240         # We should hit 3 breakpoints.
 241         for i in range(3):
 242             output = self.gdb.c()
 243             self.gdb.p("$pc")
 244             self.assertIn("Breakpoint ", output)
 245             #TODO self.assertIn("rot13 ", output)
 246         self.exit()
 247
 248     def test_too_many_hwbp(self):
 249         for i in range(30):
 250             self.gdb.hbreak("*rot13 + %d" % (i * 4))
 251
 252         output = self.gdb.c()
 253         self.assertIn("Cannot insert hardware breakpoint", output)
 254         # Clean up, otherwise the hardware breakpoints stay set and future
 255         # tests may fail.
 256         self.gdb.command("D")
 257
 258     def test_registers(self):
 259         # Get to a point in the code where some registers have actually been
 260         # used.
 261         self.gdb.b("rot13")
 262         self.gdb.c()
 263         self.gdb.c()
 264         # Try both forms to test gdb.
 265         for cmd in ("info all-registers", "info registers all"):
 266             output = self.gdb.command(cmd)
 267             self.assertNotIn("Could not", output)
 268             for reg in ('zero', 'ra', 'sp', 'gp', 'tp'):
 269                 self.assertIn(reg, output)
 270
 271         #TODO
 272         # mcpuid is one of the few registers that should have the high bit set
 273         # (for rv64).
 274         # Leave this commented out until gdb and spike agree on the encoding of
 275         # mcpuid (which is going to be renamed to misa in any case).
 276         #self.assertRegexpMatches(output, ".*mcpuid *0x80")
 277
 278         #TODO:
 279         # The instret register should always be changing.
 280         #last_instret = None
 281         #for _ in range(5):
 282         #    instret = self.gdb.p("$instret")
 283         #    self.assertNotEqual(instret, last_instret)
 284         #    last_instret = instret
 285         #    self.gdb.stepi()
 286
 287         self.exit()
 288
 289     def test_interrupt(self):
 290         """Sending gdb ^C while the program is running should cause it to halt."""
 291         self.gdb.b("main:start")
 292         self.gdb.c()
 293         self.gdb.p("i=123");
 294         self.gdb.c(wait=False)
 295         time.sleep(0.1)
 296         output = self.gdb.interrupt()
 297         #TODO: assert "main" in output
 298         self.assertGreater(self.gdb.p("j"), 10)
 299         self.gdb.p("i=0");
 300         self.exit()
 301
 302 class StepTest(DeleteServer):
 303     def setUp(self):
 304         self.binary = target.compile("programs/step.S")
 305         self.server = target.server()
 306         self.gdb = testlib.Gdb()
 307         self.gdb.command("file %s" % self.binary)
 308         self.gdb.command("target extended-remote localhost:%d" % self.server.port)
 309         self.gdb.load()
 310         self.gdb.b("main")
 311         self.gdb.c()
 312
 313     def test_step(self):
 314         main = self.gdb.p("$pc")
 315         for expected in (4, 8, 0xc, 0x10, 0x18, 0x1c, 0x28, 0x20, 0x2c, 0x2c):
 316             self.gdb.stepi()
 317             pc = self.gdb.p("$pc")
 318             self.assertEqual("%x" % pc, "%x" % (expected + main))
 319
 320 class RegsTest(DeleteServer):
 321     def setUp(self):
 322         self.binary = target.compile("programs/regs.S")
 323         self.server = target.server()
 324         self.gdb = testlib.Gdb()
 325         self.gdb.command("file %s" % self.binary)
 326         self.gdb.command("target extended-remote localhost:%d" % self.server.port)
 327         self.gdb.load()
 328         self.gdb.b("main")
 329         self.gdb.b("handle_trap")
 330         self.gdb.c()
 331
 332     def test_write_gprs(self):
 333         regs = [("x%d" % n) for n in range(2, 32)]
 334
 335         self.gdb.p("$pc=write_regs")
 336         for i, r in enumerate(regs):
 337             self.gdb.command("p $%s=%d" % (r, (0xdeadbeef<<i)+17))
 338         self.gdb.command("p $x1=data")
 339         self.gdb.command("b all_done")
 340         output = self.gdb.c()
 341         self.assertIn("Breakpoint ", output)
 342
 343         # Just to get this data in the log.
 344         self.gdb.command("x/30gx data")
 345         self.gdb.command("info registers")
 346         for n in range(len(regs)):
 347             self.assertEqual(self.gdb.x("data+%d" % (8*n), 'g'),
 348                     ((0xdeadbeef<<n)+17) & ((1<<target.xlen)-1))
 349
 350     def test_write_csrs(self):
 351         # As much a test of gdb as of the simulator.
 352         self.gdb.p("$mscratch=0")
 353         self.gdb.stepi()
 354         self.assertEqual(self.gdb.p("$mscratch"), 0)
 355         self.gdb.p("$mscratch=123")
 356         self.gdb.stepi()
 357         self.assertEqual(self.gdb.p("$mscratch"), 123)
 358
 359         self.gdb.command("p $pc=write_regs")
 360         self.gdb.command("p $a0=data")
 361         self.gdb.command("b all_done")
 362         self.gdb.command("c")
 363
 364         self.assertEqual(123, self.gdb.p("$mscratch"))
 365         self.assertEqual(123, self.gdb.p("$x1"))
 366         self.assertEqual(123, self.gdb.p("$csr832"))
 367
 368 class DownloadTest(DeleteServer):
 369     def setUp(self):
 370         length = min(2**20, target.ram_size - 2048)
 371         fd = file("download.c", "w")
 372         fd.write("#include <stdint.h>\n")
 373         fd.write("unsigned int crc32a(uint8_t *message, unsigned int size);\n")
 374         fd.write("uint32_t length = %d;\n" % length)
 375         fd.write("uint8_t d[%d] = {\n" % length)
 376         self.crc = 0
 377         for i in range(length / 16):
 378             fd.write("  /* 0x%04x */ " % (i * 16));
 379             for _ in range(16):
 380                 value = random.randrange(1<<8)
 381                 fd.write("%d, " % value)
 382                 self.crc = binascii.crc32("%c" % value, self.crc)
 383             fd.write("\n");
 384         fd.write("};\n");
 385         fd.write("uint8_t *data = &d[0];\n");
 386         fd.write("uint32_t main() { return crc32a(data, length); }\n")
 387         fd.close()
 388
 389         if self.crc < 0:
 390             self.crc += 2**32
 391
 392         self.binary = target.compile("download.c", "programs/checksum.c")
 393         self.server = target.server()
 394         self.gdb = testlib.Gdb()
 395         self.gdb.command("file %s" % self.binary)
 396         self.gdb.command("target extended-remote localhost:%d" % self.server.port)
 397
 398     def test_download(self):
 399         output = self.gdb.load()
 400         self.gdb.command("b _exit")
 401         self.gdb.c()
 402         self.assertEqual(self.gdb.p("status"), self.crc)
 403
 404 class MprvTest(DeleteServer):
 405     def setUp(self):
 406         self.binary = target.compile("programs/mprv.S")
 407         self.server = target.server()
 408         self.gdb = testlib.Gdb()
 409         self.gdb.command("file %s" % self.binary)
 410         self.gdb.command("target extended-remote localhost:%d" % self.server.port)
 411         self.gdb.load()
 412
 413     def test_mprv(self):
 414         """Test that the debugger can access memory when MPRV is set."""
 415         self.gdb.c(wait=False)
 416         time.sleep(0.5)
 417         self.gdb.interrupt()
 418         output = self.gdb.command("p/x *(int*)(((char*)&data)-0x80000000)")
 419         self.assertIn("0xbead", output)
 420
 421 class Target(object):
 422     directory = None
 423
 424     def server(self):
 425         raise NotImplementedError
 426
 427     def compile(self, *sources):
 428         return testlib.compile(sources +
 429                 ("programs/entry.S", "programs/init.c",
 430                     "-I", "../env",
 431                     "-T", "targets/%s/link.lds" % (self.directory or self.name),
 432                     "-nostartfiles",
 433                     "-mcmodel=medany"), xlen=self.xlen)
 434
 435 class Spike64Target(Target):
 436     name = "spike"
 437     xlen = 64
 438     ram = 0x80010000
 439     ram_size = 5 * 1024 * 1024
 440
 441     def server(self):
 442         return testlib.Spike(parsed.cmd, halted=True)
 443
 444 class Spike32Target(Target):
 445     name = "spike32"
 446     directory = "spike"
 447     xlen = 32
 448     ram = 0x80010000
 449     ram_size = 5 * 1024 * 1024
 450
 451     def server(self):
 452         return testlib.Spike(parsed.cmd, halted=True, xlen=32)
 453
 454 class MicroSemiTarget(Target):
 455     name = "m2gl_m2s"
 456     xlen = 32
 457     ram = 0x80000000
 458     ram_size = 16 * 1024
 459
 460     def server(self):
 461         return testlib.Openocd(cmd=parsed.cmd,
 462                 config="targets/%s/openocd.cfg" % self.name)
 463
 464 targets = [
 465         Spike32Target,
 466         Spike64Target,
 467         MicroSemiTarget
 468         ]
 469
 470 def main():
 471     parser = argparse.ArgumentParser(
 472             epilog="""
 473             Example command line from the real world:
 474             Run all RegsTest cases against a MicroSemi m2gl_m2s board, with custom openocd command:
 475             ./gdbserver.py --m2gl_m2s --cmd "$HOME/SiFive/openocd/src/openocd -s $HOME/SiFive/openocd/tcl -d" -- -vf RegsTest
 476             """)
 477     group = parser.add_mutually_exclusive_group(required=True)
 478     for t in targets:
 479         group.add_argument("--%s" % t.name, action="store_const", const=t,
 480                 dest="target")
 481     parser.add_argument("--cmd",
 482             help="The command to use to start the debug server.")
 483     parser.add_argument("unittest", nargs="*")
 484     global parsed
 485     parsed = parser.parse_args()
 486
 487     global target
 488     target = parsed.target()
 489     unittest.main(argv=[sys.argv[0]] + parsed.unittest)
 490
 491 # TROUBLESHOOTING TIPS
 492 # If a particular test fails, run just that one test, eg.:
 493 # ./tests/gdbserver.py MprvTest.test_mprv
 494 # Then inspect gdb.log and spike.log to see what happened in more detail.
 495
 496 if __name__ == '__main__':
 497     sys.exit(main())