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target/arm: Add ARM_CP_SME

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This will be used for controlling access to SME cpregs.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220620175235.60881-5-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2022-06-20 10:51:48 -07:00 committed by Peter Maydell
parent 58b2908ee1
commit bca063d579
2 changed files with 23 additions and 0 deletions
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5
target/arm/cpregs.h
View File

@ -113,6 +113,11 @@ enum {
ARM_CP_EL3_NO_EL2_UNDEF = 1 << 16, ARM_CP_EL3_NO_EL2_UNDEF = 1 << 16,
ARM_CP_EL3_NO_EL2_KEEP = 1 << 17, ARM_CP_EL3_NO_EL2_KEEP = 1 << 17,
ARM_CP_EL3_NO_EL2_C_NZ = 1 << 18, ARM_CP_EL3_NO_EL2_C_NZ = 1 << 18,
/*
* Flag: Access check for this sysreg is constrained by the
* ARM pseudocode function CheckSMEAccess().
*/
ARM_CP_SME = 1 << 19,
}; };
/* /*

18
target/arm/translate-a64.c
View File

@ -1187,6 +1187,22 @@ bool sve_access_check(DisasContext *s)
return fp_access_check(s); return fp_access_check(s);
} }
/*
* Check that SME access is enabled, raise an exception if not.
* Note that this function corresponds to CheckSMEAccess and is
* only used directly for cpregs.
*/
static bool sme_access_check(DisasContext *s)
{
if (s->sme_excp_el) {
gen_exception_insn_el(s, s->pc_curr, EXCP_UDEF,
syn_smetrap(SME_ET_AccessTrap, false),
s->sme_excp_el);
return false;
}
return true;
}
/* /*
* This utility function is for doing register extension with an * This utility function is for doing register extension with an
* optional shift. You will likely want to pass a temporary for the * optional shift. You will likely want to pass a temporary for the
@ -1958,6 +1974,8 @@ static void handle_sys(DisasContext *s, uint32_t insn, bool isread,
return; return;
} else if ((ri->type & ARM_CP_SVE) && !sve_access_check(s)) { } else if ((ri->type & ARM_CP_SVE) && !sve_access_check(s)) {
return; return;
} else if ((ri->type & ARM_CP_SME) && !sme_access_check(s)) {
return;
} }
if ((tb_cflags(s->base.tb) & CF_USE_ICOUNT) && (ri->type & ARM_CP_IO)) { if ((tb_cflags(s->base.tb) & CF_USE_ICOUNT) && (ri->type & ARM_CP_IO)) {