gdb/testsuite/gdb.arch/riscv-unwind-long-insn.exp

   1 # Copyright 2019-2020 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 tests GDB's ability to handle 6 and 8 byte instructions in the
  17 # RISC-V prologue scanner.  These instruction should be ignored, but
  18 # should not result in an error that interrupts the debug session.
  19 #
  20 # Each of the files riscv-unwind-long-insn-*.s include a function
  21 # (func) that contains a fake long instruction (6 or 8 bytes) in the
  22 # prologue.  We trick GDB into parsing the fake instruction by tail
  23 # calling from a different function, 'bar' to the middle of 'func'.
  24
  25 if {![istarget "riscv*-*-*"]} {
  26     verbose "Skipping ${gdb_test_file_name}."
  27     return
  28 }
  29
  30 foreach_with_prefix {insn_size} {6 8} {
  31     standard_testfile riscv-unwind-long-insn.c \
  32         riscv-unwind-long-insn-${insn_size}.s
  33
  34     set testfile "${testfile}-${insn_size}"
  35     if {[prepare_for_testing "failed to prepare" $testfile \
  36              "$srcfile $srcfile2"  debug]} {
  37         return -1
  38     }
  39
  40     if ![runto_main] then {
  41         fail "can't run to main"
  42         return 0
  43     }
  44
  45     gdb_breakpoint "bar"
  46     gdb_continue_to_breakpoint "bar"
  47
  48     # This next single instruction step takes us through a tail-call
  49     # from 'bar' into 'func'.
  50     gdb_test "si" "func \(\).*"
  51
  52     # Now check that we have a sane backtrace.
  53     gdb_test "bt" \
  54         [multi_line \
  55              "#0\[ \t\]*func \\\(\\\) at .*$srcfile2:\[0-9\]+" \
  56              "#1\[ \t\]*$hex in main \\\(\\\) at .*$srcfile:\[0-9\]+"] \
  57         "Backtrace to the main frame"
  58
  59     # Finally finish, and we should end up back in main.
  60     gdb_test "finish" "main \\\(\\\) at .*$srcfile:.*"
  61 }