gdb/testsuite/gdb.arch/riscv-bp-infcall.exp

# Copyright 2019-2021 Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Test GDB for RISC-V always uses an uncompressed breakpoint when
# setting up for an inferior call.

if {![istarget "riscv*-*-*"]} {
    verbose "Skipping ${gdb_test_file_name}."
    return
}

standard_testfile

if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} {
    return -1
}

if ![runto_main] then {
   return 0
}

# Figure out where the breakpoint will be placed taking account for
# stack alignment, and allocation of the dummy code area.
set bp_addr [get_valueof "/x" "\$sp" 0]
set bp_addr [format 0x%x [expr ($bp_addr & ~0xf) - 0x20]]

# Fill the region we know will be used as the scratch area with the
# compressed nop instruction.  If GDB fails to overwrite this with an
# uncompressed nop then a compressed breakpoint will be used in the
# following inferior call.
for {set i 0} {$i < 16} {incr i 2} {
    gdb_test_no_output "set *((unsigned short *) (${bp_addr} + $i))=0x1" \
	"place compressed nop in scratch area at offset $i"
}

# Make an inferior call.  GDB should write an uncompressed nop into
# the scratch area and so force the use of an uncompressed breakpoint,
# however, if this mechanism fails and GDB uses a compressed
# breakpoint, and the target doesn't support compressed instructions,
# then we would expect weird things to happen here.
gdb_test_no_output "set debug riscv breakpoints 1"
gdb_test "call dummy_call ()" \
    ".*Using EBREAK for breakpoint at $bp_addr \\(instruction length 4\\).*"