bef6a77f6d
Factor out the code used for setting the MTE TCF0 field from the prctl code into a convenient function. Other subsystems, like gdbstub, need to set this field as well, so keep it as a separate function to avoid duplication and ensure consistency in how this field is set across the board. Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org> Message-Id: <20240628050850.536447-7-gustavo.romero@linaro.org> [AJB: clean-up includes, move MTE defines] Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20240705084047.857176-36-alex.bennee@linaro.org>
36 lines
1.0 KiB
C
36 lines
1.0 KiB
C
/*
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* ARM MemTag convenience functions.
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*
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* This code is licensed under the GNU GPL v2 or later.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#include "qemu/osdep.h"
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#include "qemu.h"
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#include "mte_user_helper.h"
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void arm_set_mte_tcf0(CPUArchState *env, abi_long value)
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{
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/*
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* Write PR_MTE_TCF to SCTLR_EL1[TCF0].
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*
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* The kernel has a per-cpu configuration for the sysadmin,
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* /sys/devices/system/cpu/cpu<N>/mte_tcf_preferred,
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* which qemu does not implement.
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*
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* Because there is no performance difference between the modes, and
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* because SYNC is most useful for debugging MTE errors, choose SYNC
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* as the preferred mode. With this preference, and the way the API
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* uses only two bits, there is no way for the program to select
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* ASYMM mode.
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*/
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unsigned tcf = 0;
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if (value & PR_MTE_TCF_SYNC) {
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tcf = 1;
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} else if (value & PR_MTE_TCF_ASYNC) {
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tcf = 2;
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}
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env->cp15.sctlr_el[1] = deposit64(env->cp15.sctlr_el[1], 38, 2, tcf);
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}
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