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target/arm: Implement gdbstub pauth extension

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The extension is primarily defined by the Linux kernel NT_ARM_PAC_MASK
ptrace register set.

The original gdb feature consists of two masks, data and code, which are
used to mask out the authentication code within a pointer.  Following
discussion with Luis Machado, add two more masks in order to support
pointers within the high half of the address space (i.e. TTBR1 vs TTBR0).

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1105
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230227213329.793795-12-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2023-02-27 11:33:26 -10:00 • committed by Peter Maydell
parent abf1f1b03a
commit e995d5cce4
7 changed files with 59 additions and 3 deletions
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15
gdb-xml/aarch64-pauth.xml Normal file
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<?xml version="1.0"?>
<!-- Copyright (C) 2018-2022 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved. -->
<!DOCTYPE feature SYSTEM "gdb-target.dtd">
<feature name="org.gnu.gdb.aarch64.pauth">
<reg name="pauth_dmask" bitsize="64"/>
<reg name="pauth_cmask" bitsize="64"/>
<reg name="pauth_dmask_high" bitsize="64"/>
<reg name="pauth_cmask_high" bitsize="64"/>
</feature>