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[gdb/testsuite] Fix gdb.arch/i386-pkru.exp on linux

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When running test-case gdb.arch/i386-pkru.exp on a machine with "Memory
Protection Keys for Userspace" support, we run into:
...
(gdb) PASS: gdb.arch/i386-pkru.exp: probe PKRU support
print $pkru^M
$2 = 1431655764^M
(gdb) FAIL: gdb.arch/i386-pkru.exp: pkru register
...

The test-case expects the $pkru register to have the default value 0, matching
the "init state" of 0 defined by the XSAVE hardware.

Since linux kernel version v4.9 containing commit acd547b29880 ("x86/pkeys:
Default to a restrictive init PKRU"), the register is set to 0x55555554 by
default (which matches the printed decimal value above).

Fix the FAIL by accepting this value for linux.

Tested on x86_64-linux.
This commit is contained in:
Tom de Vries
2021-12-01 13:51:19 +01:00
parent 92fc129e2b
commit a561456f2d
1 changed files with 10 additions and 3 deletions
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13
gdb/testsuite/gdb.arch/i386-pkru.exp
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@ -20,6 +20,15 @@ if { ![istarget i?86-*-*] && ![istarget x86_64-*-* ] } {
return
}
set default_pkru_re 0x0
if { [istarget *-*-linux*] } {
# Starting with v4.9, the linux kernel contains commit acd547b29880
# ("x86/pkeys: Default to a restrictive init PKRU"), which sets the
# pkru register to 0x55555554 by default.
set default_pkru_re (0x0|0x55555554)
}
set comp_flags "-I${srcdir}/../nat/"
if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} \
@ -50,9 +59,7 @@ if { !$supports_pkru } {
}
# Test pkru register at startup
# set test_string "0"
gdb_test "print \$pkru" "= 0" "pkru register"
gdb_test "print /x \$pkru" "= $default_pkru_re" "pkru register"
# Read values from pseudo registers.
gdb_breakpoint [ gdb_get_line_number "break here 1" ]