gdb/testsuite/gdb.arch/aarch64-tagged-pointer.exp

# Copyright 2017-2021 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/>.
#
# This file is part of the gdb testsuite.

if {![is_aarch64_target]} {
    verbose "Skipping ${gdb_test_file_name}."
    return
}

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

if ![runto_main] {
    return -1
}

gdb_breakpoint [gdb_get_line_number "breakpoint here"]
gdb_continue_to_breakpoint "breakpoint here"

# Test that GDB manages caches correctly for tagged address.
# Read from P2,
gdb_test "x p2" "$hex:\[\t \]+0x000004d2" "x p2"
gdb_test_no_output "set variable i = 5678"
# Test that *P2 is updated.
gdb_test "x p2" "$hex:\[\t \]+0x0000162e" "x p2, updated"

# Read from SP1->i,
gdb_test "print sp1->i" " = 1234" "print SP1->i"
# Write to SP2->i,
gdb_test_no_output "set variable sp2->i = 5678"
# Test that SP1->i is updated.
gdb_test "print sp1->i" " = 5678" "print SP1->i, updated"

gdb_test "x/d &sp2->i" "$hex:\[\t \]+5678"
gdb_test "x/d &sp1->i" "$hex:\[\t \]+5678"

# Test that the same disassembly is got when disassembling function vs
# tagged function pointer.
set insn1 ""
set insn2 ""
set test "disassemble foo,+8"
gdb_test_multiple $test $test {
    -re ":\[\t \]+(\[a-z\]*)\[ \r\n\]+.*:\[\t \]+(\[a-z\]*).*$gdb_prompt $" {
	set insn1 $expect_out(1,string)
	set insn2 $expect_out(2,string)
	pass $test
    }
}

gdb_test "disassemble func_ptr,+8" \
    ":\[\t \]+$insn1\[ \r\n\]+.*:\[\t \]+$insn2.*"

foreach_with_prefix bptype {"hbreak" "break"} {

    # Set a breakpoint on a tagged address, func_ptr,
    gdb_test "$bptype *func_ptr" \
	"warning: Breakpoint address adjusted from .*reakpoint $decimal at .*" \
	"breakpoint at *func_ptr"
    # Resume the program and expect it hits foo,
    gdb_test "continue" \
	"Continuing\\..*Breakpoint \[0-9\]+, foo \\(\\) at .*" \
	"run until breakpoint set *func_ptr"
    gdb_test "up" "foo \\(\\).*" "caller is foo"
    delete_breakpoints

    # Set a breakpoint on normal function, call it through tagged
    # function pointer.
    gdb_test "$bptype foo" "reakpoint $decimal at .*" \
	"hardware breakpoint at foo"
    gdb_test "continue" \
	"Continuing\\..*Breakpoint \[0-9\]+, foo \\(\\) at .*" \
	"run until breakpoint set foo"
    gdb_test "up" "\\(\*func_ptr\\) \\(\\).*" "caller is *func_ptr"
    delete_breakpoints
}

gdb_test "down"
gdb_test "finish"

# sp1 and p1 are untagged pointers, but sp2 and p2 are tagged pointers.
# Cycle through all of them to make sure the following combinations work:
#
# hw watch on untagged address, hit on untagged address.
# hw watch on tagged address, hit on untagged address.
# hw watch on untagged address, hit on tagged address.
# hw watch on tagged address, hit on tagged address.
foreach symbol {"sp1" "sp2" "p1" "p2"} {
    gdb_test "watch *${symbol}"
    gdb_test "continue" \
	"Continuing\\..*Hardware watchpoint \[0-9\]+.*" \
	"run until watchpoint on ${symbol}"
    gdb_test "continue" \
	"Continuing\\..*Hardware watchpoint \[0-9\]+.*" \
	"run until watchpoint on ${symbol}, 2nd hit"
    delete_breakpoints
}