gdb/testsuite/gdb.arch/riscv-bp-infcall.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 # Test GDB for RISC-V always uses an uncompressed breakpoint when
  17 # setting up for an inferior call.
  18
  19 if {![istarget "riscv*-*-*"]} {
  20     verbose "Skipping ${gdb_test_file_name}."
  21     return
  22 }
  23
  24 standard_testfile
  25
  26 if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} {
  27     return -1
  28 }
  29
  30 if ![runto_main] then {
  31    fail "can't run to main"
  32    return 0
  33 }
  34
  35 # Figure out where the breakpoint will be placed taking account for
  36 # stack alignment, and allocation of the dummy code area.
  37 set bp_addr [get_valueof "/x" "\$sp" 0]
  38 set bp_addr [format 0x%x [expr ($bp_addr & ~0xf) - 0x20]]
  39
  40 # Fill the region we know will be used as the scratch area with the
  41 # compressed nop instruction.  If GDB fails to overwrite this with an
  42 # uncompressed nop then a compressed breakpoint will be used in the
  43 # following inferior call.
  44 for {set i 0} {$i < 16} {incr i 2} {
  45     gdb_test_no_output "set *((unsigned short *) (${bp_addr} + $i))=0x1" \
  46         "place compressed nop in scratch area at offset $i"
  47 }
  48
  49 # Make an inferior call.  GDB should write an uncompressed nop into
  50 # the scratch area and so force the use of an uncompressed breakpoint,
  51 # however, if this mechanism fails and GDB uses a compressed
  52 # breakpoint, and the target doesn't support compressed instructions,
  53 # then we would expect weird things to happen here.
  54 gdb_test_no_output "set debug riscv breakpoints 1"
  55 gdb_test "call dummy_call ()" \
  56     ".*Using EBREAK for breakpoint at $bp_addr \\(instruction length 4\\).*"