forked from Imagelibrary/binutils-gdb
116 lines
3.6 KiB
Plaintext
116 lines
3.6 KiB
Plaintext
# Copyright 2022-2023 Free Software Foundation, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# This file is part of the gdb testsuite.
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#
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# Test that GDB for AArch64/Linux can properly handle pointers with
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# the upper 16 bits (PAC) or 8 bits (Tag) set, as well as the
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# VA_RANGE_SELECT bit (55).
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require is_aarch64_target
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standard_testfile
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if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] } {
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return -1
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}
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if ![runto_main] {
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return -1
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}
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# We need to iterate over two distinct ranges, separated by a single bit.
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# This bit is 55 (VA_RANGE_SELECT) which tells us if we have a kernel-space
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# address or a user-space address.
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# The tag field has 8 bits.
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set tag_bits_count 8
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# The pac field has 7 bits.
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set pac_bits_count 7
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# A couple patterns that we reuse for the tests later. One is for a successful
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# memory read and the other is for a memory read failure.
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set memory_read_ok_pattern "$::hex\( <l>\)?:\[ \t\]+$::hex"
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set memory_read_fail_pattern "$::hex:\[ \t\]+Cannot access memory at address $::hex"
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set pac_enabled 0
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# Check if PAC is enabled.
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gdb_test_multiple "ptype \$pauth_cmask" "fetch PAC cmask" {
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-re -wrap "type = long" {
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set pac_enabled 1
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}
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-re -wrap "type = void" {
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}
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-re ".*$gdb_prompt $" {
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fail $gdb_test_name
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return 1
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}
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}
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# Value of the cmask register.
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set cmask 0
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# If there are PAC registers, GDB uses those to unmask the PAC bits.
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if {$pac_enabled} {
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set cmask [get_valueof "" "\$pauth_cmask >> 48" "0" "fetch PAC cmask"]
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}
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# Cycle through the tag and pac bit ranges and check how GDB
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# behaves when trying to access these addresses.
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foreach_with_prefix upper_bits {"0x0" "0x1" "0x2" "0x4" "0x8" "0x10" "0x20" "0x40" "0x80"} {
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foreach_with_prefix lower_bits {"0x0" "0x1" "0x2" "0x4" "0x8" "0x10" "0x20" "0x40"} {
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# A successful memory read pattern
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set pattern $memory_read_ok_pattern
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if {!$pac_enabled} {
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# If PAC is not supported, memory reads will fail if
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# lower_bits != 0x0
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if {$lower_bits != "0x0"} {
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set pattern $memory_read_fail_pattern
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}
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} else {
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# Otherwise, figure out if the memory read will succeed or not by
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# checking cmask.
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gdb_test_multiple "p/x (~${cmask}ULL & (${lower_bits}ULL))" "" {
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-re -wrap "= 0x0" {
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# Either cmask is 0x7F or lower_bits is 0x0.
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# Either way, the memory read should succeed.
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}
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-re -wrap "= $::hex" {
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if {$lower_bits != "0x0"} {
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# cmask doesn't mask off all the PAC bits, which
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# results in a memory read failure, with the actual
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# address being accessed differing from the one we
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# passed.
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set pattern $memory_read_fail_pattern
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}
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}
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}
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}
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# Test without the VA_RANGE_SELECT bit set.
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gdb_test "x/gx ((unsigned long) l_ptr | ((${upper_bits}ULL << 56) | (${lower_bits}ULL << 48)))" \
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$pattern \
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"user-space memory access"
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# Now test with the VA_RANGE_SELECT bit set.
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gdb_test "x/gx ((unsigned long) l_ptr | ((${upper_bits}ULL << 56) | (${lower_bits}ULL << 48) | (1ULL << 55))) " \
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$memory_read_fail_pattern \
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"kernel-space memory access"
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}
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}
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