debug/gdbserver.py

   1 #!/usr/bin/env python
   2
   3 import argparse
   4 import binascii
   5 import random
   6 import sys
   7 import tempfile
   8 import time
   9 import os
  10
  11 import targets
  12 import testlib
  13 from testlib import assertEqual, assertNotEqual, assertIn, assertNotIn
  14 from testlib import assertGreater, assertRegexpMatches, assertLess
  15 from testlib import GdbTest, GdbSingleHartTest, TestFailed, assertTrue
  16
  17 MSTATUS_UIE = 0x00000001
  18 MSTATUS_SIE = 0x00000002
  19 MSTATUS_HIE = 0x00000004
  20 MSTATUS_MIE = 0x00000008
  21 MSTATUS_UPIE = 0x00000010
  22 MSTATUS_SPIE = 0x00000020
  23 MSTATUS_HPIE = 0x00000040
  24 MSTATUS_MPIE = 0x00000080
  25 MSTATUS_SPP = 0x00000100
  26 MSTATUS_HPP = 0x00000600
  27 MSTATUS_MPP = 0x00001800
  28 MSTATUS_FS = 0x00006000
  29 MSTATUS_XS = 0x00018000
  30 MSTATUS_MPRV = 0x00020000
  31 MSTATUS_PUM = 0x00040000
  32 MSTATUS_MXR = 0x00080000
  33 MSTATUS_VM = 0x1F000000
  34 MSTATUS32_SD = 0x80000000
  35 MSTATUS64_SD = 0x8000000000000000
  36
  37 # pylint: disable=abstract-method
  38
  39 def ihex_line(address, record_type, data):
  40     assert len(data) < 128
  41     line = ":%02X%04X%02X" % (len(data), address, record_type)
  42     check = len(data)
  43     check += address % 256
  44     check += address >> 8
  45     check += record_type
  46     for char in data:
  47         value = ord(char)
  48         check += value
  49         line += "%02X" % value
  50     line += "%02X\n" % ((256-check)%256)
  51     return line
  52
  53 def ihex_parse(line):
  54     assert line.startswith(":")
  55     line = line[1:]
  56     data_len = int(line[:2], 16)
  57     address = int(line[2:6], 16)
  58     record_type = int(line[6:8], 16)
  59     data = ""
  60     for i in range(data_len):
  61         data += "%c" % int(line[8+2*i:10+2*i], 16)
  62     return record_type, address, data
  63
  64 def readable_binary_string(s):
  65     return "".join("%02x" % ord(c) for c in s)
  66
  67 class SimpleRegisterTest(GdbTest):
  68     def check_reg(self, name, alias):
  69         a = random.randrange(1<<self.hart.xlen)
  70         b = random.randrange(1<<self.hart.xlen)
  71         self.gdb.p("$%s=0x%x" % (name, a))
  72         assertEqual(self.gdb.p("$%s" % alias), a)
  73         self.gdb.stepi()
  74         assertEqual(self.gdb.p("$%s" % name), a)
  75         assertEqual(self.gdb.p("$%s" % alias), a)
  76         self.gdb.p("$%s=0x%x" % (alias, b))
  77         assertEqual(self.gdb.p("$%s" % name), b)
  78         self.gdb.stepi()
  79         assertEqual(self.gdb.p("$%s" % name), b)
  80         assertEqual(self.gdb.p("$%s" % alias), b)
  81
  82     def setup(self):
  83         # 0x13 is nop
  84         self.gdb.command("p *((int*) 0x%x)=0x13" % self.hart.ram)
  85         self.gdb.command("p *((int*) 0x%x)=0x13" % (self.hart.ram + 4))
  86         self.gdb.command("p *((int*) 0x%x)=0x13" % (self.hart.ram + 8))
  87         self.gdb.command("p *((int*) 0x%x)=0x13" % (self.hart.ram + 12))
  88         self.gdb.command("p *((int*) 0x%x)=0x13" % (self.hart.ram + 16))
  89         self.gdb.p("$pc=0x%x" % self.hart.ram)
  90
  91 class SimpleS0Test(SimpleRegisterTest):
  92     def test(self):
  93         self.check_reg("s0", "x8")
  94
  95 class SimpleS1Test(SimpleRegisterTest):
  96     def test(self):
  97         self.check_reg("s1", "x9")
  98
  99 class SimpleT0Test(SimpleRegisterTest):
 100     def test(self):
 101         self.check_reg("t0", "x5")
 102
 103 class SimpleT1Test(SimpleRegisterTest):
 104     def test(self):
 105         self.check_reg("t1", "x6")
 106
 107 class SimpleF18Test(SimpleRegisterTest):
 108     def check_reg(self, name, alias):
 109         if self.hart.extensionSupported('F'):
 110             self.gdb.p_raw("$mstatus=$mstatus | 0x00006000")
 111             self.gdb.stepi()
 112             a = random.random()
 113             b = random.random()
 114             self.gdb.p_raw("$%s=%f" % (name, a))
 115             assertLess(abs(float(self.gdb.p_raw("$%s" % alias)) - a), .001)
 116             self.gdb.stepi()
 117             assertLess(abs(float(self.gdb.p_raw("$%s" % name)) - a), .001)
 118             assertLess(abs(float(self.gdb.p_raw("$%s" % alias)) - a), .001)
 119             self.gdb.p_raw("$%s=%f" % (alias, b))
 120             assertLess(abs(float(self.gdb.p_raw("$%s" % name)) - b), .001)
 121             self.gdb.stepi()
 122             assertLess(abs(float(self.gdb.p_raw("$%s" % name)) - b), .001)
 123             assertLess(abs(float(self.gdb.p_raw("$%s" % alias)) - b), .001)
 124
 125             size = self.gdb.p("sizeof($%s)" % name)
 126             if self.hart.extensionSupported('D'):
 127                 assertEqual(size, 8)
 128             else:
 129                 assertEqual(size, 4)
 130         else:
 131             output = self.gdb.p_raw("$" + name)
 132             assertEqual(output, "void")
 133             output = self.gdb.p_raw("$" + alias)
 134             assertEqual(output, "void")
 135
 136     def test(self):
 137         self.check_reg("f18", "fs2")
 138
 139 class SimpleNoExistTest(GdbTest):
 140     def test(self):
 141         try:
 142             self.gdb.p("$csr2288")
 143             assert False, "Reading csr2288 should have failed"
 144         except testlib.CouldNotFetch:
 145             pass
 146         try:
 147             self.gdb.p("$csr2288=5")
 148             assert False, "Writing csr2288 should have failed"
 149         except testlib.CouldNotFetch:
 150             pass
 151
 152 class SimpleMemoryTest(GdbTest):
 153     def access_test(self, size, data_type):
 154         assertEqual(self.gdb.p("sizeof(%s)" % data_type), size)
 155         a = 0x86753095555aaaa & ((1<<(size*8))-1)
 156         b = 0xdeadbeef12345678 & ((1<<(size*8))-1)
 157         addrA = self.hart.ram
 158         addrB = self.hart.ram + self.hart.ram_size - size
 159         self.gdb.p("*((%s*)0x%x) = 0x%x" % (data_type, addrA, a))
 160         self.gdb.p("*((%s*)0x%x) = 0x%x" % (data_type, addrB, b))
 161         assertEqual(self.gdb.p("*((%s*)0x%x)" % (data_type, addrA)), a)
 162         assertEqual(self.gdb.p("*((%s*)0x%x)" % (data_type, addrB)), b)
 163
 164 class MemTest8(SimpleMemoryTest):
 165     def test(self):
 166         self.access_test(1, 'char')
 167
 168 class MemTest16(SimpleMemoryTest):
 169     def test(self):
 170         self.access_test(2, 'short')
 171
 172 class MemTest32(SimpleMemoryTest):
 173     def test(self):
 174         self.access_test(4, 'int')
 175
 176 class MemTest64(SimpleMemoryTest):
 177     def test(self):
 178         self.access_test(8, 'long long')
 179
 180 # FIXME: I'm not passing back invalid addresses correctly in read/write memory.
 181 #class MemTestReadInvalid(SimpleMemoryTest):
 182 #    def test(self):
 183 #        # This test relies on 'gdb_report_data_abort enable' being executed in
 184 #        # the openocd.cfg file.
 185 #        try:
 186 #            self.gdb.p("*((int*)0xdeadbeef)")
 187 #            assert False, "Read should have failed."
 188 #        except testlib.CannotAccess as e:
 189 #            assertEqual(e.address, 0xdeadbeef)
 190 #        self.gdb.p("*((int*)0x%x)" % self.hart.ram)
 191 #
 192 #class MemTestWriteInvalid(SimpleMemoryTest):
 193 #    def test(self):
 194 #        # This test relies on 'gdb_report_data_abort enable' being executed in
 195 #        # the openocd.cfg file.
 196 #        try:
 197 #            self.gdb.p("*((int*)0xdeadbeef)=8675309")
 198 #            assert False, "Write should have failed."
 199 #        except testlib.CannotAccess as e:
 200 #            assertEqual(e.address, 0xdeadbeef)
 201 #        self.gdb.p("*((int*)0x%x)=6874742" % self.hart.ram)
 202
 203 class MemTestBlock(GdbTest):
 204     length = 1024
 205     line_length = 16
 206
 207     def test(self):
 208         a = tempfile.NamedTemporaryFile(suffix=".ihex")
 209         data = ""
 210         for i in range(self.length / self.line_length):
 211             line_data = "".join(["%c" % random.randrange(256)
 212                 for _ in range(self.line_length)])
 213             data += line_data
 214             a.write(ihex_line(i * self.line_length, 0, line_data))
 215         a.flush()
 216
 217         self.gdb.command("shell cat %s" % a.name)
 218         self.gdb.command("restore %s 0x%x" % (a.name, self.hart.ram))
 219         increment = 19 * 4
 220         for offset in range(0, self.length, increment) + [self.length-4]:
 221             value = self.gdb.p("*((int*)0x%x)" % (self.hart.ram + offset))
 222             written = ord(data[offset]) | \
 223                     (ord(data[offset+1]) << 8) | \
 224                     (ord(data[offset+2]) << 16) | \
 225                     (ord(data[offset+3]) << 24)
 226             assertEqual(value, written)
 227
 228         b = tempfile.NamedTemporaryFile(suffix=".ihex")
 229         self.gdb.command("dump ihex memory %s 0x%x 0x%x" % (b.name,
 230             self.hart.ram, self.hart.ram + self.length))
 231         self.gdb.command("shell cat %s" % b.name)
 232         for line in b.xreadlines():
 233             record_type, address, line_data = ihex_parse(line)
 234             if record_type == 0:
 235                 written_data = data[address:address+len(line_data)]
 236                 if line_data != written_data:
 237                     raise TestFailed(
 238                             "Data mismatch at 0x%x; wrote %s but read %s" % (
 239                                 address, readable_binary_string(written_data),
 240                                 readable_binary_string(line_data)))
 241
 242 class InstantHaltTest(GdbTest):
 243     def test(self):
 244         """Assert that reset is really resetting what it should."""
 245         self.gdb.command("monitor reset halt")
 246         self.gdb.command("flushregs")
 247         threads = self.gdb.threads()
 248         pcs = []
 249         for t in threads:
 250             self.gdb.thread(t)
 251             pcs.append(self.gdb.p("$pc"))
 252         for pc in pcs:
 253             assertIn(pc, self.hart.reset_vectors)
 254         # mcycle and minstret have no defined reset value.
 255         mstatus = self.gdb.p("$mstatus")
 256         assertEqual(mstatus & (MSTATUS_MIE | MSTATUS_MPRV |
 257             MSTATUS_VM), 0)
 258
 259 class InstantChangePc(GdbTest):
 260     def test(self):
 261         """Change the PC right as we come out of reset."""
 262         # 0x13 is nop
 263         self.gdb.command("monitor reset halt")
 264         self.gdb.command("flushregs")
 265         self.gdb.command("p *((int*) 0x%x)=0x13" % self.hart.ram)
 266         self.gdb.command("p *((int*) 0x%x)=0x13" % (self.hart.ram + 4))
 267         self.gdb.command("p *((int*) 0x%x)=0x13" % (self.hart.ram + 8))
 268         self.gdb.p("$pc=0x%x" % self.hart.ram)
 269         self.gdb.stepi()
 270         assertEqual((self.hart.ram + 4), self.gdb.p("$pc"))
 271         self.gdb.stepi()
 272         assertEqual((self.hart.ram + 8), self.gdb.p("$pc"))
 273
 274 class DebugTest(GdbSingleHartTest):
 275     # Include malloc so that gdb can make function calls. I suspect this malloc
 276     # will silently blow through the memory set aside for it, so be careful.
 277     compile_args = ("programs/debug.c", "programs/checksum.c",
 278             "programs/tiny-malloc.c", "-DDEFINE_MALLOC", "-DDEFINE_FREE")
 279
 280     def setup(self):
 281         self.gdb.load()
 282         self.gdb.b("_exit")
 283
 284     def exit(self, expected_result=0xc86455d4):
 285         output = self.gdb.c()
 286         assertIn("Breakpoint", output)
 287         assertIn("_exit", output)
 288         assertEqual(self.gdb.p("status"), expected_result)
 289
 290 class DebugCompareSections(DebugTest):
 291     def test(self):
 292         output = self.gdb.command("compare-sections")
 293         matched = 0
 294         for line in output.splitlines():
 295             if line.startswith("Section"):
 296                 assert line.endswith("matched.")
 297                 matched += 1
 298         assertGreater(matched, 1)
 299
 300 class DebugFunctionCall(DebugTest):
 301     def test(self):
 302         self.gdb.b("main:start")
 303         self.gdb.c()
 304         assertEqual(self.gdb.p('fib(6)'), 8)
 305         assertEqual(self.gdb.p('fib(7)'), 13)
 306         self.exit()
 307
 308 class DebugChangeString(DebugTest):
 309     def test(self):
 310         text = "This little piggy went to the market."
 311         self.gdb.b("main:start")
 312         self.gdb.c()
 313         self.gdb.p('fox = "%s"' % text)
 314         self.exit(0x43b497b8)
 315
 316 class DebugTurbostep(DebugTest):
 317     def test(self):
 318         """Single step a bunch of times."""
 319         self.gdb.b("main:start")
 320         self.gdb.c()
 321         self.gdb.command("p i=0")
 322         last_pc = None
 323         advances = 0
 324         jumps = 0
 325         for _ in range(10):
 326             self.gdb.stepi()
 327             pc = self.gdb.p("$pc")
 328             assertNotEqual(last_pc, pc)
 329             if last_pc and pc > last_pc and pc - last_pc <= 4:
 330                 advances += 1
 331             else:
 332                 jumps += 1
 333             last_pc = pc
 334         # Some basic sanity that we're not running between breakpoints or
 335         # something.
 336         assertGreater(jumps, 1)
 337         assertGreater(advances, 5)
 338
 339 class DebugExit(DebugTest):
 340     def test(self):
 341         self.exit()
 342
 343 class DebugSymbols(DebugTest):
 344     def test(self):
 345         self.gdb.b("main")
 346         self.gdb.b("rot13")
 347         output = self.gdb.c()
 348         assertIn(", main ", output)
 349         output = self.gdb.c()
 350         assertIn(", rot13 ", output)
 351
 352 class DebugBreakpoint(DebugTest):
 353     def test(self):
 354         self.gdb.b("rot13")
 355         # The breakpoint should be hit exactly 2 times.
 356         for _ in range(2):
 357             output = self.gdb.c()
 358             self.gdb.p("$pc")
 359             assertIn("Breakpoint ", output)
 360             assertIn("rot13 ", output)
 361         self.exit()
 362
 363 class Hwbp1(DebugTest):
 364     def test(self):
 365         if self.hart.instruction_hardware_breakpoint_count < 1:
 366             return 'not_applicable'
 367
 368         if not self.hart.honors_tdata1_hmode:
 369             # Run to main before setting the breakpoint, because startup code
 370             # will otherwise clear the trigger that we set.
 371             self.gdb.b("main")
 372             self.gdb.c()
 373
 374         self.gdb.hbreak("rot13")
 375         # The breakpoint should be hit exactly 2 times.
 376         for _ in range(2):
 377             output = self.gdb.c()
 378             self.gdb.p("$pc")
 379             assertRegexpMatches(output, r"[bB]reakpoint")
 380             assertIn("rot13 ", output)
 381         self.exit()
 382
 383 class Hwbp2(DebugTest):
 384     def test(self):
 385         if self.hart.instruction_hardware_breakpoint_count < 2:
 386             return 'not_applicable'
 387
 388         self.gdb.hbreak("main")
 389         self.gdb.hbreak("rot13")
 390         # We should hit 3 breakpoints.
 391         for expected in ("main", "rot13", "rot13"):
 392             output = self.gdb.c()
 393             self.gdb.p("$pc")
 394             assertRegexpMatches(output, r"[bB]reakpoint")
 395             assertIn("%s " % expected, output)
 396         self.exit()
 397
 398 class TooManyHwbp(DebugTest):
 399     def test(self):
 400         for i in range(30):
 401             self.gdb.hbreak("*rot13 + %d" % (i * 4))
 402
 403         output = self.gdb.c()
 404         assertIn("Cannot insert hardware breakpoint", output)
 405         # Clean up, otherwise the hardware breakpoints stay set and future
 406         # tests may fail.
 407         self.gdb.command("D")
 408
 409 class Registers(DebugTest):
 410     def test(self):
 411         # Get to a point in the code where some registers have actually been
 412         # used.
 413         self.gdb.b("rot13")
 414         self.gdb.c()
 415         self.gdb.c()
 416         # Try both forms to test gdb.
 417         for cmd in ("info all-registers", "info registers all"):
 418             output = self.gdb.command(cmd)
 419             for reg in ('zero', 'ra', 'sp', 'gp', 'tp'):
 420                 assertIn(reg, output)
 421             for line in output.splitlines():
 422                 assertRegexpMatches(line, r"^\S")
 423
 424         #TODO
 425         # mcpuid is one of the few registers that should have the high bit set
 426         # (for rv64).
 427         # Leave this commented out until gdb and spike agree on the encoding of
 428         # mcpuid (which is going to be renamed to misa in any case).
 429         #assertRegexpMatches(output, ".*mcpuid *0x80")
 430
 431         #TODO:
 432         # The instret register should always be changing.
 433         #last_instret = None
 434         #for _ in range(5):
 435         #    instret = self.gdb.p("$instret")
 436         #    assertNotEqual(instret, last_instret)
 437         #    last_instret = instret
 438         #    self.gdb.stepi()
 439
 440         self.exit()
 441
 442 class UserInterrupt(DebugTest):
 443     def test(self):
 444         """Sending gdb ^C while the program is running should cause it to
 445         halt."""
 446         self.gdb.b("main:start")
 447         self.gdb.c()
 448         self.gdb.p("i=123")
 449         self.gdb.c(wait=False)
 450         time.sleep(2)
 451         output = self.gdb.interrupt()
 452         assert "main" in output
 453         assertGreater(self.gdb.p("j"), 10)
 454         self.gdb.p("i=0")
 455         self.exit()
 456
 457 class InterruptTest(GdbSingleHartTest):
 458     compile_args = ("programs/interrupt.c",)
 459
 460     def early_applicable(self):
 461         return self.target.supports_clint_mtime
 462
 463     def setup(self):
 464         self.gdb.load()
 465
 466     def test(self):
 467         self.gdb.b("main")
 468         output = self.gdb.c()
 469         assertIn(" main ", output)
 470         self.gdb.b("trap_entry")
 471         output = self.gdb.c()
 472         assertIn(" trap_entry ", output)
 473         assertEqual(self.gdb.p("$mip") & 0x80, 0x80)
 474         assertEqual(self.gdb.p("interrupt_count"), 0)
 475         # You'd expect local to still be 0, but it looks like spike doesn't
 476         # jump to the interrupt handler immediately after the write to
 477         # mtimecmp.
 478         assertLess(self.gdb.p("local"), 1000)
 479         self.gdb.command("delete breakpoints")
 480         for _ in range(10):
 481             self.gdb.c(wait=False)
 482             time.sleep(2)
 483             self.gdb.interrupt()
 484             interrupt_count = self.gdb.p("interrupt_count")
 485             local = self.gdb.p("local")
 486             if interrupt_count > 1000 and \
 487                     local > 1000:
 488                 return
 489
 490         assertGreater(interrupt_count, 1000)
 491         assertGreater(local, 1000)
 492
 493     def postMortem(self):
 494         GdbSingleHartTest.postMortem(self)
 495         self.gdb.p("*((long long*) 0x200bff8)")
 496         self.gdb.p("*((long long*) 0x2004000)")
 497         self.gdb.p("interrupt_count")
 498         self.gdb.p("local")
 499
 500 class MulticoreRegTest(GdbTest):
 501     compile_args = ("programs/infinite_loop.S", "-DMULTICORE")
 502
 503     def early_applicable(self):
 504         return len(self.target.harts) > 1
 505
 506     def setup(self):
 507         self.gdb.load()
 508         for hart in self.target.harts:
 509             self.gdb.select_hart(hart)
 510             self.gdb.p("$pc=_start")
 511
 512     def test(self):
 513         # Run to main
 514         for hart in self.target.harts:
 515             self.gdb.select_hart(hart)
 516             self.gdb.b("main")
 517             self.gdb.c()
 518             assertIn("main", self.gdb.where())
 519             self.gdb.command("delete breakpoints")
 520
 521         # Run through the entire loop.
 522         for hart in self.target.harts:
 523             self.gdb.select_hart(hart)
 524             self.gdb.b("main_end")
 525             self.gdb.c()
 526             assertIn("main_end", self.gdb.where())
 527
 528         hart_ids = []
 529         for hart in self.target.harts:
 530             self.gdb.select_hart(hart)
 531             # Check register values.
 532             hart_id = self.gdb.p("$x1")
 533             assertNotIn(hart_id, hart_ids)
 534             hart_ids.append(hart_id)
 535             for n in range(2, 32):
 536                 value = self.gdb.p("$x%d" % n)
 537                 assertEqual(value, hart_ids[-1] + n - 1)
 538
 539         # Confirmed that we read different register values for different harts.
 540         # Write a new value to x1, and run through the add sequence again.
 541
 542         for hart in self.target.harts:
 543             self.gdb.select_hart(hart)
 544             self.gdb.p("$x1=0x%x" % (hart.index * 0x800))
 545             self.gdb.p("$pc=main_post_csrr")
 546             self.gdb.c()
 547         for hart in self.target.harts:
 548             self.gdb.select_hart(hart)
 549             assertIn("main", self.gdb.where())
 550             # Check register values.
 551             for n in range(1, 32):
 552                 value = self.gdb.p("$x%d" % n)
 553                 assertEqual(value, hart.index * 0x800 + n - 1)
 554
 555 class MulticoreRunHaltStepiTest(GdbTest):
 556     compile_args = ("programs/multicore.c", "-DMULTICORE")
 557
 558     def early_applicable(self):
 559         return len(self.target.harts) > 1
 560
 561     def setup(self):
 562         self.gdb.load()
 563         for hart in self.target.harts:
 564             self.gdb.select_hart(hart)
 565             self.gdb.p("$mhartid")
 566             self.gdb.p("$pc=_start")
 567
 568     def test(self):
 569         previous_hart_count = [0 for h in self.target.harts]
 570         previous_interrupt_count = [0 for h in self.target.harts]
 571         # Check 10 times
 572         for i in range(10):
 573             # 3 attempts for each time we want the check to pass
 574             for attempt in range(3):
 575                 self.gdb.global_command("echo round %d attempt %d\\n" % (i,
 576                     attempt))
 577                 self.gdb.c_all(wait=False)
 578                 time.sleep(2)
 579                 self.gdb.interrupt_all()
 580                 hart_count = self.gdb.p("hart_count")
 581                 interrupt_count = self.gdb.p("interrupt_count")
 582                 ok = True
 583                 for i, h in enumerate(self.target.harts):
 584                     if hart_count[i] <= previous_hart_count[i]:
 585                         ok = False
 586                         break
 587                     if interrupt_count[i] <= previous_interrupt_count[i]:
 588                         ok = False
 589                         break
 590                     self.gdb.p("$mie")
 591                     self.gdb.p("$mip")
 592                     self.gdb.p("$mstatus")
 593                     self.gdb.p("$priv")
 594                     self.gdb.p("buf", fmt="")
 595                     self.gdb.select_hart(h)
 596                     pc = self.gdb.p("$pc")
 597                     self.gdb.stepi()
 598                     stepped_pc = self.gdb.p("$pc")
 599                     assertNotEqual(pc, stepped_pc)
 600                 previous_hart_count = hart_count
 601                 previous_interrupt_count = interrupt_count
 602                 if ok:
 603                     break
 604             else:
 605                 assert False, \
 606                         "hart count or interrupt didn't increment as expected"
 607
 608 class MulticoreRunAllHaltOne(GdbTest):
 609     compile_args = ("programs/multicore.c", "-DMULTICORE")
 610
 611     def early_applicable(self):
 612         return len(self.target.harts) > 1
 613
 614     def setup(self):
 615         self.gdb.select_hart(self.target.harts[0])
 616         self.gdb.load()
 617         for hart in self.target.harts:
 618             self.gdb.select_hart(hart)
 619             self.gdb.p("$pc=_start")
 620
 621     def test(self):
 622         if not self.gdb.one_hart_per_gdb():
 623             return 'not_applicable'
 624
 625         # Run harts in reverse order
 626         for h in reversed(self.target.harts):
 627             self.gdb.select_hart(h)
 628             self.gdb.c(wait=False)
 629
 630         self.gdb.interrupt()
 631         # Give OpenOCD time to call poll() on both harts, which is what causes
 632         # the bug.
 633         time.sleep(1)
 634         self.gdb.p("buf", fmt="")
 635
 636 class StepTest(GdbSingleHartTest):
 637     compile_args = ("programs/step.S", )
 638
 639     def setup(self):
 640         self.gdb.load()
 641         self.gdb.b("main")
 642         self.gdb.c()
 643
 644     def test(self):
 645         main_address = self.gdb.p("$pc")
 646         if self.hart.extensionSupported("c"):
 647             sequence = (4, 8, 0xc, 0xe, 0x14, 0x18, 0x22, 0x1c, 0x24, 0x24)
 648         else:
 649             sequence = (4, 8, 0xc, 0x10, 0x18, 0x1c, 0x28, 0x20, 0x2c, 0x2c)
 650         for expected in sequence:
 651             self.gdb.stepi()
 652             pc = self.gdb.p("$pc")
 653             assertEqual("%x" % (pc - main_address), "%x" % expected)
 654
 655 class TriggerTest(GdbSingleHartTest):
 656     compile_args = ("programs/trigger.S", )
 657     def setup(self):
 658         self.gdb.load()
 659         self.gdb.b("_exit")
 660         self.gdb.b("main")
 661         self.gdb.c()
 662
 663     def exit(self):
 664         output = self.gdb.c()
 665         assertIn("Breakpoint", output)
 666         assertIn("_exit", output)
 667
 668 class TriggerExecuteInstant(TriggerTest):
 669     """Test an execute breakpoint on the first instruction executed out of
 670     debug mode."""
 671     def test(self):
 672         main_address = self.gdb.p("$pc")
 673         self.gdb.command("hbreak *0x%x" % (main_address + 4))
 674         self.gdb.c()
 675         assertEqual(self.gdb.p("$pc"), main_address+4)
 676
 677 # FIXME: Triggers aren't quite working yet
 678 #class TriggerLoadAddress(TriggerTest):
 679 #    def test(self):
 680 #        self.gdb.command("rwatch *((&data)+1)")
 681 #        output = self.gdb.c()
 682 #        assertIn("read_loop", output)
 683 #        assertEqual(self.gdb.p("$a0"),
 684 #                self.gdb.p("(&data)+1"))
 685 #        self.exit()
 686
 687 class TriggerLoadAddressInstant(TriggerTest):
 688     """Test a load address breakpoint on the first instruction executed out of
 689     debug mode."""
 690     def test(self):
 691         self.gdb.command("b just_before_read_loop")
 692         self.gdb.c()
 693         read_loop = self.gdb.p("&read_loop")
 694         read_again = self.gdb.p("&read_again")
 695         data = self.gdb.p("&data")
 696         self.gdb.command("rwatch *0x%x" % data)
 697         self.gdb.c()
 698         # Accept hitting the breakpoint before or after the load instruction.
 699         assertIn(self.gdb.p("$pc"), [read_loop, read_loop + 4])
 700         assertEqual(self.gdb.p("$a0"), self.gdb.p("&data"))
 701
 702         self.gdb.c()
 703         assertIn(self.gdb.p("$pc"), [read_again, read_again + 4])
 704         assertEqual(self.gdb.p("$a0"), self.gdb.p("&data"))
 705
 706 # FIXME: Triggers aren't quite working yet
 707 #class TriggerStoreAddress(TriggerTest):
 708 #    def test(self):
 709 #        self.gdb.command("watch *((&data)+3)")
 710 #        output = self.gdb.c()
 711 #        assertIn("write_loop", output)
 712 #        assertEqual(self.gdb.p("$a0"),
 713 #                self.gdb.p("(&data)+3"))
 714 #        self.exit()
 715
 716 class TriggerStoreAddressInstant(TriggerTest):
 717     def test(self):
 718         """Test a store address breakpoint on the first instruction executed out
 719         of debug mode."""
 720         self.gdb.command("b just_before_write_loop")
 721         self.gdb.c()
 722         write_loop = self.gdb.p("&write_loop")
 723         data = self.gdb.p("&data")
 724         self.gdb.command("watch *0x%x" % data)
 725         self.gdb.c()
 726         # Accept hitting the breakpoint before or after the store instruction.
 727         assertIn(self.gdb.p("$pc"), [write_loop, write_loop + 4])
 728         assertEqual(self.gdb.p("$a0"), self.gdb.p("&data"))
 729
 730 class TriggerDmode(TriggerTest):
 731     def early_applicable(self):
 732         return self.hart.honors_tdata1_hmode
 733
 734     def check_triggers(self, tdata1_lsbs, tdata2):
 735         dmode = 1 << (self.hart.xlen-5)
 736
 737         triggers = []
 738
 739         if self.hart.xlen == 32:
 740             xlen_type = 'int'
 741         elif self.hart.xlen == 64:
 742             xlen_type = 'long long'
 743         else:
 744             raise NotImplementedError
 745
 746         dmode_count = 0
 747         i = 0
 748         for i in range(16):
 749             tdata1 = self.gdb.p("((%s *)&data)[%d]" % (xlen_type, 2*i))
 750             if tdata1 == 0:
 751                 break
 752             tdata2 = self.gdb.p("((%s *)&data)[%d]" % (xlen_type, 2*i+1))
 753
 754             if tdata1 & dmode:
 755                 dmode_count += 1
 756             else:
 757                 assertEqual(tdata1 & 0xffff, tdata1_lsbs)
 758                 assertEqual(tdata2, tdata2)
 759
 760         assertGreater(i, 1)
 761         assertEqual(dmode_count, 1)
 762
 763         return triggers
 764
 765     def test(self):
 766         self.gdb.command("hbreak write_load_trigger")
 767         self.gdb.b("clear_triggers")
 768         self.gdb.p("$pc=write_store_trigger")
 769         output = self.gdb.c()
 770         assertIn("write_load_trigger", output)
 771         self.check_triggers((1<<6) | (1<<1), 0xdeadbee0)
 772         output = self.gdb.c()
 773         assertIn("clear_triggers", output)
 774         self.check_triggers((1<<6) | (1<<0), 0xfeedac00)
 775
 776 class RegsTest(GdbSingleHartTest):
 777     compile_args = ("programs/regs.S", )
 778     def setup(self):
 779         self.gdb.load()
 780         self.gdb.b("main")
 781         self.gdb.b("handle_trap")
 782         self.gdb.c()
 783
 784 class WriteGprs(RegsTest):
 785     def test(self):
 786         regs = [("x%d" % n) for n in range(2, 32)]
 787
 788         self.gdb.p("$pc=write_regs")
 789         for i, r in enumerate(regs):
 790             self.gdb.p("$%s=%d" % (r, (0xdeadbeef<<i)+17))
 791         self.gdb.p("$x1=data")
 792         self.gdb.command("b all_done")
 793         output = self.gdb.c()
 794         assertIn("Breakpoint ", output)
 795
 796         # Just to get this data in the log.
 797         self.gdb.command("x/30gx data")
 798         self.gdb.command("info registers")
 799         for n in range(len(regs)):
 800             assertEqual(self.gdb.x("data+%d" % (8*n), 'g'),
 801                     ((0xdeadbeef<<n)+17) & ((1<<self.hart.xlen)-1))
 802
 803 class WriteCsrs(RegsTest):
 804     def test(self):
 805         # As much a test of gdb as of the simulator.
 806         self.gdb.p("$mscratch=0")
 807         self.gdb.stepi()
 808         assertEqual(self.gdb.p("$mscratch"), 0)
 809         self.gdb.p("$mscratch=123")
 810         self.gdb.stepi()
 811         assertEqual(self.gdb.p("$mscratch"), 123)
 812
 813         self.gdb.p("$pc=write_regs")
 814         self.gdb.p("$x1=data")
 815         self.gdb.command("b all_done")
 816         self.gdb.command("c")
 817
 818         assertEqual(123, self.gdb.p("$mscratch"))
 819         assertEqual(123, self.gdb.p("$x1"))
 820         assertEqual(123, self.gdb.p("$csr832"))
 821
 822 class DownloadTest(GdbTest):
 823     def setup(self):
 824         # pylint: disable=attribute-defined-outside-init
 825         length = min(2**10, self.hart.ram_size - 2048)
 826         self.download_c = tempfile.NamedTemporaryFile(prefix="download_",
 827                 suffix=".c", delete=False)
 828         self.download_c.write("#include <stdint.h>\n")
 829         self.download_c.write(
 830                 "unsigned int crc32a(uint8_t *message, unsigned int size);\n")
 831         self.download_c.write("uint32_t length = %d;\n" % length)
 832         self.download_c.write("uint8_t d[%d] = {\n" % length)
 833         self.crc = 0
 834         assert length % 16 == 0
 835         for i in range(length / 16):
 836             self.download_c.write("  /* 0x%04x */ " % (i * 16))
 837             for _ in range(16):
 838                 value = random.randrange(1<<8)
 839                 self.download_c.write("0x%02x, " % value)
 840                 self.crc = binascii.crc32("%c" % value, self.crc)
 841             self.download_c.write("\n")
 842         self.download_c.write("};\n")
 843         self.download_c.write("uint8_t *data = &d[0];\n")
 844         self.download_c.write(
 845                 "uint32_t main() { return crc32a(data, length); }\n")
 846         self.download_c.flush()
 847
 848         if self.crc < 0:
 849             self.crc += 2**32
 850
 851         self.binary = self.target.compile(self.hart, self.download_c.name,
 852                 "programs/checksum.c")
 853         self.gdb.global_command("file %s" % self.binary)
 854
 855     def test(self):
 856         self.gdb.load()
 857         self.parkOtherHarts()
 858         self.gdb.command("b _exit")
 859         self.gdb.c()
 860         assertEqual(self.gdb.p("status"), self.crc)
 861         os.unlink(self.download_c.name)
 862
 863 #class MprvTest(GdbSingleHartTest):
 864 #    compile_args = ("programs/mprv.S", )
 865 #    def setup(self):
 866 #        self.gdb.load()
 867 #
 868 #    def test(self):
 869 #        """Test that the debugger can access memory when MPRV is set."""
 870 #        self.gdb.c(wait=False)
 871 #        time.sleep(0.5)
 872 #        self.gdb.interrupt()
 873 #        output = self.gdb.command("p/x *(int*)(((char*)&data)-0x80000000)")
 874 #        assertIn("0xbead", output)
 875
 876 class PrivTest(GdbSingleHartTest):
 877     compile_args = ("programs/priv.S", )
 878     def setup(self):
 879         # pylint: disable=attribute-defined-outside-init
 880         self.gdb.load()
 881
 882         misa = self.hart.misa
 883         self.supported = set()
 884         if misa & (1<<20):
 885             self.supported.add(0)
 886         if misa & (1<<18):
 887             self.supported.add(1)
 888         if misa & (1<<7):
 889             self.supported.add(2)
 890         self.supported.add(3)
 891
 892 class PrivRw(PrivTest):
 893     def test(self):
 894         """Test reading/writing priv."""
 895         # Disable physical memory protection by allowing U mode access to all
 896         # memory.
 897         try:
 898             self.gdb.p("$pmpcfg0=0xf")  # TOR, R, W, X
 899             self.gdb.p("$pmpaddr0=0x%x" %
 900                     ((self.hart.ram + self.hart.ram_size) >> 2))
 901         except testlib.CouldNotFetch:
 902             # PMP registers are optional
 903             pass
 904
 905         # Ensure Virtual Memory is disabled if applicable (SATP register is not
 906         # reset)
 907         try:
 908             self.gdb.p("$satp=0")
 909         except testlib.CouldNotFetch:
 910             # SATP only exists if you have S mode.
 911             pass
 912
 913         # Leave the PC at _start, where the first 4 instructions should be
 914         # legal in any mode.
 915         for privilege in range(4):
 916             self.gdb.p("$priv=%d" % privilege)
 917             self.gdb.stepi()
 918             actual = self.gdb.p("$priv")
 919             assertIn(actual, self.supported)
 920             if privilege in self.supported:
 921                 assertEqual(actual, privilege)
 922
 923 class PrivChange(PrivTest):
 924     def test(self):
 925         """Test that the core's privilege level actually changes."""
 926
 927         if 0 not in self.supported:
 928             return 'not_applicable'
 929
 930         self.gdb.b("main")
 931         self.gdb.c()
 932
 933         # Machine mode
 934         self.gdb.p("$priv=3")
 935         main_address = self.gdb.p("$pc")
 936         self.gdb.stepi()
 937         assertEqual("%x" % self.gdb.p("$pc"), "%x" % (main_address+4))
 938
 939         # User mode
 940         self.gdb.p("$priv=0")
 941         self.gdb.stepi()
 942         # Should have taken an exception, so be nowhere near main.
 943         pc = self.gdb.p("$pc")
 944         assertTrue(pc < main_address or pc > main_address + 0x100)
 945
 946 parsed = None
 947 def main():
 948     parser = argparse.ArgumentParser(
 949             description="Test that gdb can talk to a RISC-V target.",
 950             epilog="""
 951             Example command line from the real world:
 952             Run all RegsTest cases against a physical FPGA, with custom openocd command:
 953             ./gdbserver.py --freedom-e300 --server_cmd "$HOME/SiFive/openocd/src/openocd -s $HOME/SiFive/openocd/tcl -d" Simple
 954             """)
 955     targets.add_target_options(parser)
 956
 957     testlib.add_test_run_options(parser)
 958
 959     # TODO: remove global
 960     global parsed   # pylint: disable=global-statement
 961     parsed = parser.parse_args()
 962     target = targets.target(parsed)
 963     testlib.print_log_names = parsed.print_log_names
 964
 965     module = sys.modules[__name__]
 966
 967     return testlib.run_all_tests(module, target, parsed)
 968
 969 # TROUBLESHOOTING TIPS
 970 # If a particular test fails, run just that one test, eg.:
 971 # ./gdbserver.py MprvTest.test_mprv
 972 # Then inspect gdb.log and spike.log to see what happened in more detail.
 973
 974 if __name__ == '__main__':
 975     sys.exit(main())