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 19if {![istarget "riscv*-*-*"]} { 20 verbose "Skipping ${gdb_test_file_name}." 21 return 22} 23 24standard_testfile 25 26if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} { 27 return -1 28} 29 30if ![runto_main] then { 31 fail "can't run to main" 32 return 0 33} 34 35# Figure out where the breakpoint will be placed taking account for 36# stack alignment, and allocation of the dummy code area. 37set bp_addr [get_valueof "/x" "\$sp" 0] 38set bp_addr [format 0x%x [expr ($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. 44for {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. 54gdb_test_no_output "set debug riscv breakpoints 1" 55gdb_test "call dummy_call ()" \ 56 ".*Using EBREAK for breakpoint at $bp_addr \\(instruction length 4\\).*" 57