gdb/testsuite/gdb.base/callfuncs.exp

   1 # Copyright 1992-2014 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 3 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16 # This file was written by Fred Fish. (fnf@cygnus.com)
  17 # and modified by Bob Manson. (manson@cygnus.com)
  18
  19 standard_testfile
  20
  21 set compile_flags {debug}
  22 if [support_complex_tests] {
  23     lappend compile_flags "additional_flags=-DTEST_COMPLEX"
  24 }
  25
  26 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable $compile_flags] != "" } {
  27      untested callfuncs.exp
  28      return -1
  29 }
  30
  31 # Create and source the file that provides information about the compiler
  32 # used to compile the test case.
  33
  34 if [get_compiler_info] {
  35     return -1
  36 }
  37
  38 if {$hp_aCC_compiler} {
  39     set prototypes 1
  40 } else {
  41     set prototypes 0
  42 }
  43
  44 # Some targets can't do function calls, so don't even bother with this
  45 # test.
  46 if [target_info exists gdb,cannot_call_functions] {
  47     setup_xfail "*-*-*" 2416
  48     fail "This target can not call functions"
  49     continue
  50 }
  51
  52 # FIXME:  Before calling this proc, we should probably verify that
  53 # we can call inferior functions and get a valid integral value
  54 # returned.
  55 # Note that it is OK to check for 0 or 1 as the returned values, because C
  56 # specifies that the numeric value of a relational or logical expression
  57 # (computed in the inferior) is 1 for true and 0 for false.
  58
  59 proc do_function_calls {} {
  60     global prototypes
  61     global gdb_prompt
  62
  63     # We need to up this because this can be really slow on some boards.
  64     set timeout 60
  65
  66     # If any of these calls segv we don't want to affect subsequent tests.
  67     # E.g., we want to ensure register values are restored.
  68     gdb_test_no_output "set unwindonsignal on"
  69
  70     gdb_test "p t_char_values(0,0)" " = 0"
  71     gdb_test "p t_char_values('a','b')" " = 1"
  72     gdb_test "p t_char_values(char_val1,char_val2)" " = 1"
  73     gdb_test "p t_char_values('a',char_val2)" " = 1"
  74     gdb_test "p t_char_values(char_val1,'b')" " = 1"
  75
  76     gdb_test "p t_short_values(0,0)" " = 0"
  77     gdb_test "p t_short_values(10,-23)" " = 1"
  78     gdb_test "p t_short_values(short_val1,short_val2)" " = 1"
  79     gdb_test "p t_short_values(10,short_val2)" " = 1"
  80     gdb_test "p t_short_values(short_val1,-23)" " = 1"
  81
  82     gdb_test "p t_int_values(0,0)" " = 0"
  83     gdb_test "p t_int_values(87,-26)" " = 1"
  84     gdb_test "p t_int_values(int_val1,int_val2)" " = 1"
  85     gdb_test "p t_int_values(87,int_val2)" " = 1"
  86     gdb_test "p t_int_values(int_val1,-26)" " = 1"
  87
  88     gdb_test "p t_long_values(0,0)" " = 0"
  89     gdb_test "p t_long_values(789,-321)" " = 1"
  90     gdb_test "p t_long_values(long_val1,long_val2)" " = 1"
  91     gdb_test "p t_long_values(789,long_val2)" " = 1"
  92     gdb_test "p t_long_values(long_val1,-321)" " = 1"
  93
  94     if ![target_info exists gdb,skip_float_tests] {
  95         gdb_test "p t_float_values(0.0,0.0)" " = 0"
  96
  97         # These next four tests fail on the mn10300.
  98         # The first value is passed in regs, the other in memory.
  99         # Gcc emits different stabs for the two parameters; the first is
 100         # claimed to be a float, the second a double.
 101         # dbxout.c in gcc claims this is the desired behavior.
 102         # These tests also fail for RealView, because GDB can not tell that
 103         # the function is unprototyped.
 104         setup_xfail "mn10300-*-*"
 105         if { [test_compiler_info "armcc-*"] } { setup_xfail "*-*-*" }
 106         gdb_test "p t_float_values(3.14159,-2.3765)" " = 1"
 107         setup_xfail "mn10300-*-*"
 108         if { [test_compiler_info "armcc-*"] } { setup_xfail "*-*-*" }
 109         gdb_test "p t_float_values(float_val1,float_val2)" " = 1"
 110         setup_xfail "mn10300-*-*"
 111         if { [test_compiler_info "armcc-*"] } { setup_xfail "*-*-*" }
 112         gdb_test "p t_float_values(3.14159,float_val2)" " = 1"
 113         setup_xfail "mn10300-*-*"
 114         if { [test_compiler_info "armcc-*"] } { setup_xfail "*-*-*" }
 115         gdb_test "p t_float_values(float_val1,-2.3765)" " = 1"
 116
 117         # Test passing of arguments which might not be widened.
 118         gdb_test "p t_float_values2(0.0,0.0)" " = 0"
 119
 120         # Although PR 5318 mentions SunOS specifically, this seems
 121         # to be a generic problem on quite a few platforms.
 122         if $prototypes then {
 123             setup_xfail "sparc-*-*" "mips*-*-*" 5318
 124             if { ! [test_compiler_info gcc-*-*] } then {
 125                 setup_xfail "alpha-dec-osf2*" "i*86-*-sysv4*" 5318
 126             }
 127         }
 128
 129         gdb_test "p t_float_values2(3.14159,float_val2)" " = 1"
 130
 131         gdb_test "p t_float_many_args (float_val1, float_val2, float_val3, float_val4, float_val5, float_val6, float_val7, float_val8, float_val9, float_val10, float_val11, float_val12, float_val13, float_val14, float_val15)" " = 1" "Call function with many float arguments."
 132
 133         gdb_test "p t_small_values(1,2,3,4,5,6,7,8,9,10)" " = 55"
 134
 135         gdb_test "p t_double_values(0.0,0.0)" " = 0"
 136         gdb_test "p t_double_values(45.654,-67.66)" " = 1"
 137         gdb_test "p t_double_values(double_val1,double_val2)" " = 1"
 138         gdb_test "p t_double_values(45.654,double_val2)" " = 1"
 139         gdb_test "p t_double_values(double_val1,-67.66)" " = 1"
 140
 141         gdb_test "p t_double_many_args (double_val1, double_val2, double_val3, double_val4, double_val5, double_val6, double_val7, double_val8, double_val9, double_val10, double_val11, double_val12, double_val13, double_val14, double_val15)" " = 1" "Call function with many double arguments."
 142
 143         gdb_test "p t_double_int(99.0, 1)" " = 0"
 144         gdb_test "p t_double_int(99.0, 99)" " = 1"
 145         gdb_test "p t_int_double(99, 1.0)" " = 0"
 146         gdb_test "p t_int_double(99, 99.0)" " = 1"
 147     }
 148
 149     if [support_complex_tests] {
 150         gdb_test "p t_float_complex_values(fc1, fc2)" " = 1"
 151         gdb_test "p t_float_complex_values(fc3, fc4)" " = 0"
 152
 153         gdb_test "p t_float_complex_many_args(fc1, fc2, fc3, fc4, fc1, fc2, fc3, fc4, fc1, fc2, fc3, fc4, fc1, fc2, fc3, fc4)" " = 1"
 154         gdb_test "p t_float_complex_many_args(fc1, fc1, fc1, fc1, fc1, fc1, fc1, fc1, fc1, fc1, fc1, fc1, fc1, fc1, fc1, fc1)" " = 0"
 155
 156         gdb_test "p t_double_complex_values(dc1, dc2)" " = 1"
 157         gdb_test "p t_double_complex_values(dc3, dc4)" " = 0"
 158
 159         gdb_test "p t_double_complex_many_args(dc1, dc2, dc3, dc4, dc1, dc2, dc3, dc4, dc1, dc2, dc3, dc4, dc1, dc2, dc3, dc4)" " = 1"
 160         gdb_test "p t_double_complex_many_args(dc1, dc1, dc1, dc1, dc1, dc1, dc1, dc1, dc1, dc1, dc1, dc1, dc1, dc1, dc1, dc1)" " = 0"
 161
 162         gdb_test "p t_long_double_complex_values(ldc1, ldc2)" " = 1"
 163         gdb_test "p t_long_double_complex_values(ldc3, ldc4)" " = 0"
 164         gdb_test "p t_long_double_complex_many_args(ldc1, ldc2, ldc3, ldc4, ldc1, ldc2, ldc3, ldc4, ldc1, ldc2, ldc3, ldc4, ldc1, ldc2, ldc3, ldc4)" " = 1"
 165         gdb_test "p t_long_double_complex_many_args(ldc1, ldc1, ldc1, ldc1, ldc1, ldc1, ldc1,ldc1, ldc1, ldc1, ldc1, ldc1, ldc1, ldc1, ldc1, ldc1)" " = 0"
 166     }
 167
 168     gdb_test "p t_string_values(string_val2,string_val1)" " = 0"
 169     gdb_test "p t_string_values(string_val1,string_val2)" " = 1"
 170     gdb_test "p t_string_values(\"string 1\",\"string 2\")" " = 1"
 171     gdb_test "p t_string_values(\"string 1\",string_val2)" " = 1"
 172     gdb_test "p t_string_values(string_val1,\"string 2\")" " = 1"
 173
 174     gdb_test "p t_char_array_values(char_array_val2,char_array_val1)" " = 0"
 175     gdb_test "p t_char_array_values(char_array_val1,char_array_val2)" " = 1"
 176     gdb_test "p t_char_array_values(\"carray 1\",\"carray 2\")" " = 1"
 177     gdb_test "p t_char_array_values(\"carray 1\",char_array_val2)" " = 1"
 178     gdb_test "p t_char_array_values(char_array_val1,\"carray 2\")" " = 1"
 179
 180     gdb_test "p doubleit(4)" " = 8"
 181     gdb_test "p add(4,5)" " = 9"
 182     gdb_test "p t_func_values(func_val2,func_val1)" " = 0"
 183     gdb_test "p t_func_values(func_val1,func_val2)" " = 1"
 184
 185     gdb_test "p function_struct.func(5)" " = 10"
 186     gdb_test "p function_struct_ptr->func(10)" " = 20"
 187
 188     # GDB currently screws up the passing of function parameters for
 189     # ABIs that use function descriptors.  Instead of passing the
 190     # address of te function descriptor, GDB passes the address of the
 191     # function body.  This results in the called function treating the
 192     # first few instructions of the function proper as a descriptor
 193     # and attempting a jump through that (a totally random address).
 194     setup_kfail gdb/1457 "rs6000*-*-aix*"
 195     setup_kfail gdb/1457 "powerpc*-*-aix*"
 196     setup_kfail gdb/1457 hppa*-*-hpux*
 197     gdb_test "p t_func_values(add,func_val2)" " = 1"
 198     setup_kfail gdb/1457 "rs6000*-*-aix*"
 199     setup_kfail gdb/1457 "powerpc*-*-aix*"
 200     setup_kfail gdb/1457 hppa*-*-hpux*
 201     gdb_test "p t_func_values(func_val1,doubleit)" " = 1"
 202     setup_kfail gdb/1457 "rs6000*-*-aix*"
 203     setup_kfail gdb/1457 "powerpc*-*-aix*"
 204     setup_kfail gdb/1457 hppa*-*-hpux*
 205     gdb_test "p t_call_add(add,3,4)" " = 7"
 206     gdb_test "p t_call_add(func_val1,3,4)" " = 7"
 207
 208     gdb_test "p t_enum_value1(enumval1)" " = 1"
 209     gdb_test "p t_enum_value1(enum_val1)" " = 1"
 210     gdb_test "p t_enum_value1(enum_val2)" " = 0"
 211
 212     gdb_test "p t_enum_value2(enumval2)" " = 1"
 213     gdb_test "p t_enum_value2(enum_val2)" " = 1"
 214     gdb_test "p t_enum_value2(enum_val1)" " = 0"
 215
 216     gdb_test "p sum_args(1,{2})" " = 2"
 217     gdb_test "p sum_args(2,{2,3})" " = 5"
 218     gdb_test "p sum_args(3,{2,3,4})" " = 9"
 219     gdb_test "p sum_args(4,{2,3,4,5})" " = 14"
 220
 221     gdb_test "p sum10 (1, 2, 3, 4, 5, 6, 7, 8, 9, 10)" " = 55"
 222
 223     gdb_test "p cmp10 (0, 1, 2, 3, 4, 5, 6, 7, 8, 9)" " = 1"
 224
 225     gdb_test "p t_structs_c(struct_val1)" "= 120 'x'" \
 226         "call inferior func with struct - returns char"
 227     gdb_test "p t_structs_s(struct_val1)" "= 87" \
 228         "call inferior func with struct - returns short"
 229     gdb_test "p t_structs_i(struct_val1)" "= 76" \
 230         "call inferior func with struct - returns int"
 231     gdb_test "p t_structs_l(struct_val1)" "= 51" \
 232         "call inferior func with struct - returns long"
 233
 234     if ![target_info exists gdb,skip_float_tests] {
 235         gdb_test "p t_structs_f(struct_val1)" "= 2.12.*" \
 236             "call inferior func with struct - returns float"
 237         gdb_test "p t_structs_d(struct_val1)" "= 9.87.*" \
 238             "call inferior func with struct - returns double"
 239     }
 240
 241     if [support_complex_tests] {
 242
 243         gdb_test "p t_structs_fc(struct_val1)" ".*= 3 \\+ 3 \\* I" \
 244             "call inferior func with struct - returns float _Complex"
 245
 246         gdb_test "p t_structs_dc(struct_val1)" ".*= 4 \\+ 4 \\* I" \
 247             "call inferior func with struct - returns double _Complex"
 248
 249         gdb_test "p t_structs_ldc(struct_val1)" "= 5 \\+ 5 \\* I" \
 250             "call inferior func with struct - returns long double _Complex"
 251     }
 252
 253     gdb_test "p t_structs_a(struct_val1)" "= (.unsigned char .. )?<buf.*> \"foo\"" \
 254         "call inferior func with struct - returns char *"
 255
 256     # Restore default value.
 257     gdb_test_no_output "set unwindonsignal off"
 258 }
 259
 260 # Procedure to get current content of all registers.
 261 proc fetch_all_registers {test} {
 262     global gdb_prompt
 263
 264     set all_registers_lines {}
 265     set bad -1
 266     # Former trailing `\[\r\n\]+' may eat just \r leaving \n in the buffer
 267     # corrupting the next matches.
 268     if {[gdb_test_multiple "info all-registers" $test {
 269         -re "info all-registers\r\n" {
 270             exp_continue
 271         }
 272         -ex "The program has no registers now" {
 273             set bad 1
 274             exp_continue
 275         }
 276         -re "^bspstore\[ \t\]+\[^\r\n\]+\r\n" {
 277             if [istarget "ia64-*-*"] {
 278                 # Filter out bspstore which is specially tied to bsp,
 279                 # giving spurious differences.
 280             } else {
 281                 lappend all_registers_lines $expect_out(0,string)
 282             }
 283             exp_continue
 284         }
 285         -re "^last_break\[ \t\]+\[^\r\n\]+\r\n" {
 286             if [istarget "s390*-*-*"] {
 287                 # Filter out last_break which is read-only,
 288                 # giving spurious differences.
 289             } else {
 290                 lappend all_registers_lines $expect_out(0,string)
 291             }
 292             exp_continue
 293         }
 294         -re "^\[^ \t\]+\[ \t\]+\[^\r\n\]+\r\n" {
 295             lappend all_registers_lines $expect_out(0,string)
 296             exp_continue
 297         }
 298         -re "$gdb_prompt $" {
 299             incr bad
 300         }
 301         -re "^\[^\r\n\]+\r\n" {
 302             if {!$bad} {
 303                 warning "Unrecognized output: $expect_out(0,string)"
 304                 set bad 1
 305             }
 306             exp_continue
 307         }
 308     }] != 0} {
 309         return {}
 310     }
 311
 312     if {$bad} {
 313         fail $test
 314         return {}
 315     }
 316
 317     pass $test
 318     return $all_registers_lines
 319 }
 320
 321 proc rerun_and_prepare {} {
 322     global hp_aCC_compiler
 323
 324     if { $hp_aCC_compiler } {
 325         # Do not set language explicitly to 'C'.  This will cause aCC
 326         # tests to fail because promotion rules are different.  Just let
 327         # the language be set to the default.
 328
 329         if { ![runto_main] } {
 330             gdb_suppress_tests
 331         }
 332
 333         # However, turn off overload-resolution for aCC.  Having it on causes
 334         # a lot of failures.
 335
 336         gdb_test_no_output "set overload-resolution 0"
 337     } else {
 338         if { ![runto_main] } {
 339             gdb_suppress_tests
 340         }
 341         gdb_test_no_output "set language c"
 342     }
 343
 344     get_debug_format
 345
 346     # Make sure that malloc gets called and that the floating point unit
 347     # is initialized via a call to t_double_values.
 348     gdb_test "next" "t_double_values\\(double_val1, double_val2\\);.*" \
 349         "next to t_double_values"
 350     gdb_test "next" "t_structs_c\\(struct_val1\\);.*" \
 351         "next to t_structs_c"
 352 }
 353
 354
 355 # Start with a fresh gdb.
 356
 357 gdb_exit
 358 gdb_start
 359 gdb_reinitialize_dir $srcdir/$subdir
 360 gdb_load ${binfile}
 361
 362 gdb_test_no_output "set print sevenbit-strings"
 363 gdb_test_no_output "set print address off"
 364 gdb_test_no_output "set width 0"
 365
 366 rerun_and_prepare
 367
 368 # Save all register contents.
 369 set old_reg_content [fetch_all_registers "retrieve original register contents"]
 370
 371 # Perform function calls.
 372 do_function_calls
 373
 374 # Check if all registers still have the same value.
 375 set new_reg_content [fetch_all_registers \
 376                      "register contents after gdb function calls"]
 377 if {$old_reg_content == $new_reg_content} then {
 378     pass "gdb function calls preserve register contents"
 379 } else {
 380     set old_reg_content $new_reg_content
 381     fail "gdb function calls preserve register contents"
 382 }
 383
 384 rerun_and_prepare
 385 # Save all register contents.
 386 set old_reg_content [fetch_all_registers "retrieve original register contents"]
 387
 388 # Set breakpoint at a function we will call from gdb.
 389 gdb_breakpoint add
 390
 391 # Call function (causing a breakpoint hit in the call dummy) and do a continue,
 392 # make sure we are back at main and still have the same register contents.
 393 gdb_test "print add(4,5)" \
 394         "The program being debugged stopped while.*" \
 395         "stop at breakpoint in call dummy function"
 396 gdb_test "continue" "Continuing.*" "continue from call dummy breakpoint"
 397 if ![gdb_test "bt 2" \
 398               "#0  main.*" \
 399               "bt after continuing from call dummy breakpoint"] then {
 400     set new_reg_content [fetch_all_registers \
 401                          "register contents after stop in call dummy"]
 402     if {$old_reg_content == $new_reg_content} then {
 403         pass "continue after stop in call dummy preserves register contents"
 404     } else {
 405         fail "continue after stop in call dummy preserves register contents"
 406     }
 407 }
 408
 409 rerun_and_prepare
 410 # Set breakpoint at a function we will call from gdb.
 411 gdb_breakpoint add
 412 # Save all register contents.
 413 set old_reg_content [fetch_all_registers "retrieve original register contents"]
 414
 415 # Call function (causing a breakpoint hit in the call dummy) and do a finish,
 416 # make sure we are back at main and still have the same register contents.
 417 gdb_test "print add(4,5)" "The program being debugged stopped while.*" \
 418         "call function causing a breakpoint then do a finish"
 419 gdb_test "finish" \
 420          "Value returned is .* = 9" \
 421          "finish from call dummy breakpoint returns correct value"
 422 if ![gdb_test "bt 2" \
 423               "#0  main.*" \
 424               "bt after finishing from call dummy breakpoint"] then {
 425     set new_reg_content [fetch_all_registers \
 426                          "register contents after finish in call dummy"]
 427     if {$old_reg_content == $new_reg_content} then {
 428         pass "finish after stop in call dummy preserves register contents"
 429     } else {
 430         fail "finish after stop in call dummy preserves register contents"
 431     }
 432 }
 433
 434 rerun_and_prepare
 435 # Set breakpoint at a function we will call from gdb.
 436 gdb_breakpoint add
 437 # Save all register contents.
 438 set old_reg_content [fetch_all_registers "retrieve original register contents"]
 439
 440 # Call function (causing a breakpoint hit in the call dummy) and do a return
 441 # with a value, make sure we are back at main with the same register contents.
 442 gdb_test "print add(4,5)" "The program being debugged stopped while.*" \
 443         "call function causing a breakpoint and then do a return"
 444 if ![gdb_test "return 7" \
 445               "#0  main.*" \
 446               "back at main after return from call dummy breakpoint" \
 447               "Make add return now. .y or n.*" \
 448               "y"] then {
 449     set new_reg_content [fetch_all_registers \
 450                          "register contents after return in call dummy"]
 451     if {$old_reg_content == $new_reg_content} then {
 452         pass "return after stop in call dummy preserves register contents"
 453     } else {
 454         fail "return after stop in call dummy preserves register contents"
 455     }
 456 }
 457
 458 rerun_and_prepare
 459 # Set breakpoint at a function we will call from gdb.
 460 gdb_breakpoint add
 461 set old_reg_content [fetch_all_registers "retrieve original register contents"]
 462
 463 # Call function (causing a breakpoint hit in the call dummy), and
 464 # call another function from the call dummy frame (thereby setting up
 465 # several nested call dummy frames).  Test that backtrace and finish
 466 # work when several call dummies are nested.
 467 gdb_breakpoint sum10
 468 gdb_breakpoint t_small_values
 469 gdb_test "print add(2,3)" "The program being debugged stopped while.*" \
 470         "stop at nested call level 1"
 471 gdb_test "backtrace" \
 472         "\#0  add \\(a=2, b=3\\).*\#1  <function called from gdb>.*\#2  main.*" \
 473         "backtrace at nested call level 1"
 474 gdb_test "print add(4,5)" "The program being debugged stopped while.*" \
 475         "stop at nested call level 2"
 476 gdb_test "backtrace" \
 477         "\#0  add \\(a=4, b=5\\).*\#1  <function called from gdb>.*\#2  add \\(a=2, b=3\\).*\#3  <function called from gdb>.*\#4  main.*" \
 478         "backtrace at nested call level 2"
 479 gdb_test "print sum10(2,4,6,8,10,12,14,16,18,20)" \
 480         "The program being debugged stopped while.*" \
 481         "stop at nested call level 3"
 482 gdb_test "backtrace" \
 483         "\#0  sum10 \\(i0=2, i1=4, i2=6, i3=8, i4=10, i5=12, i6=14, i7=16, i8=18, i9=20\\).*\#1  <function called from gdb>.*\#2  add \\(a=4, b=5\\).*\#3  <function called from gdb>.*\#4  add \\(a=2, b=3\\).*\#5  <function called from gdb>.*\#6  main.*" \
 484         "backtrace at nested call level 3"
 485 gdb_test "print t_small_values(1,3,5,7,9,11,13,15,17,19)" \
 486         "The program being debugged stopped while.*" \
 487         "stop at nested call level 4"
 488 gdb_test "backtrace" \
 489         "\#0  t_small_values \\(arg1=1 '.001', arg2=3, arg3=5, arg4=7 '.a', arg5=9, arg6=11 '.v', arg7=13, arg8=15, arg9=17, arg10=19\\).*\#2  sum10 \\(i0=2, i1=4, i2=6, i3=8, i4=10, i5=12, i6=14, i7=16, i8=18, i9=20\\).*\#3  <function called from gdb>.*\#4  add \\(a=4, b=5\\).*\#5  <function called from gdb>.*\#6  add \\(a=2, b=3\\).*\#7  <function called from gdb>.*\#8  main.*" \
 490         "backtrace at nested call level 4"
 491 gdb_test "finish" "Value returned is .* = 100" \
 492         "Finish from nested call level 4"
 493 gdb_test "backtrace" \
 494         "\#0  sum10 \\(i0=2, i1=4, i2=6, i3=8, i4=10, i5=12, i6=14, i7=16, i8=18, i9=20\\).*\#1  <function called from gdb>.*\#2  add \\(a=4, b=5\\).*\#3  <function called from gdb>.*\#4  add \\(a=2, b=3\\).*\#5  <function called from gdb>.*\#6  main.*" \
 495         "backtrace after finish from nested call level 4"
 496 gdb_test "finish" "Value returned is .* = 110" \
 497         "Finish from nested call level 3"
 498 gdb_test "backtrace" \
 499         "\#0  add \\(a=4, b=5\\).*\#1  <function called from gdb>.*\#2  add \\(a=2, b=3\\).*\#3  <function called from gdb>.*\#4  main.*" \
 500         "backtrace after finish from nested call level 3"
 501 gdb_test "finish" "Value returned is .* = 9" \
 502         "Finish from nested call level 2"
 503 gdb_test "backtrace" \
 504         "\#0  add \\(a=2, b=3\\).*\#1  <function called from gdb>.*\#2  main.*" \
 505         "backtrace after finish from nested call level 2"
 506 gdb_test "finish" "Value returned is .* = 5" \
 507         "Finish from nested call level 1"
 508 gdb_test "backtrace" "\#0  main .*" \
 509         "backtrace after finish from nested call level 1"
 510
 511 set new_reg_content [fetch_all_registers \
 512                      "register contents after nested call dummies"]
 513 if {$old_reg_content == $new_reg_content} then {
 514     pass "nested call dummies preserve register contents"
 515 } else {
 516     fail "nested call dummies preserve register contents"
 517 }
 518
 519 # GDB should not crash by internal error on $sp underflow during the inferior
 520 # call.  It is OK it will stop on some: Cannot access memory at address 0x$hex.
 521
 522 if {![target_info exists gdb,nosignals] && ![istarget "*-*-uclinux*"]} {
 523     gdb_test {set $old_sp = $sp}
 524
 525     gdb_test {set $sp = 0}
 526     gdb_test "call doubleit (1)" ".*" "sp == 0: call doubleit (1)"
 527
 528     gdb_test {set $sp = -1}
 529     gdb_test "call doubleit (1)" ".*" "sp == -1: call doubleit (1)"
 530
 531     gdb_test {set $sp = $old_sp}
 532 }
 533
 534 # Test function descriptor resolution - the separate debug info .opd section
 535 # handling vs. local labels `.L'... as `Lcallfunc' starts with `L'.
 536
 537 gdb_test "print callfunc (Lcallfunc, 5)" " = 12"
 538
 539 # Regression test for function pointer cast.
 540 gdb_test "print *((int *(*) (void)) voidfunc)()" " = 23"