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linux-user/aarch64: Introduce sve_vq

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Add an interface function to extract the digested vector length
rather than the raw zcr_el[1] value.  This fixes an incorrect
return from do_prctl_set_vl where we didn't take into account
the set of vector lengths supported by the cpu.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220607203306.657998-3-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2022-06-08 19:38:55 +01:00 • committed by Peter Maydell
parent f45ce4c35f
commit 8b599e5c02
3 changed files with 26 additions and 9 deletions
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4
linux-user/aarch64/signal.c
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@ -315,7 +315,7 @@ static int target_restore_sigframe(CPUARMState *env,
case TARGET_SVE_MAGIC:
if (cpu_isar_feature(aa64_sve, env_archcpu(env))) {
vq = (env->vfp.zcr_el[1] & 0xf) + 1;
vq = sve_vq(env);
sve_size = QEMU_ALIGN_UP(TARGET_SVE_SIG_CONTEXT_SIZE(vq), 16);
if (!sve && size == sve_size) {
sve = (struct target_sve_context *)ctx;
@ -434,7 +434,7 @@ static void target_setup_frame(int usig, struct target_sigaction *ka,
/* SVE state needs saving only if it exists. */
if (cpu_isar_feature(aa64_sve, env_archcpu(env))) {
vq = (env->vfp.zcr_el[1] & 0xf) + 1;
vq = sve_vq(env);
sve_size = QEMU_ALIGN_UP(TARGET_SVE_SIG_CONTEXT_SIZE(vq), 16);
sve_ofs = alloc_sigframe_space(sve_size, &layout);
}