linux-user/aarch64: Implement FPMR signal frames
Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20260522220306.235200-17-richard.henderson@linaro.org Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Richard Henderson committed
May 22, 2026 at 15:02 UTC
82e6411eacee9381cd51c9084c7ba08b7407b39b
1 file changed
+43
-1
linux-user/aarch64/signal.c
+43
-1
@@ -73,6 +73,13 @@ struct target_esr_context {
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uint64_t esr;
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};
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+#define TARGET_FPMR_MAGIC 0x46504d52
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+
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+struct target_fpmr_context {
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+ struct target_aarch64_ctx head;
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+ uint64_t fpmr;
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+};
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+
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#define TARGET_EXTRA_MAGIC 0x45585401
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struct target_extra_context {
@@ -362,6 +369,14 @@ static bool target_setup_gcs_record(struct target_gcs_context *ctx,
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return true;
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}
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+static void target_setup_fpmr_record(struct target_fpmr_context *ctx,
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+ CPUARMState *env)
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+{
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+ __put_user(TARGET_FPMR_MAGIC, &ctx->head.magic);
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+ __put_user(sizeof(*ctx), &ctx->head.size);
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+ __put_user(env->vfp.fpmr, &ctx->fpmr);
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+}
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+
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static void target_restore_general_frame(CPUARMState *env,
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struct target_rt_sigframe *sf)
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{
@@ -518,6 +533,12 @@ static void target_restore_tpidr2_record(CPUARMState *env,
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__get_user(env->cp15.tpidr2_el0, &tpidr2->tpidr2);
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}
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+static void target_restore_fpmr_record(CPUARMState *env,
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+ struct target_fpmr_context *fpmr)
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+{
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+ __get_user(env->vfp.fpmr, &fpmr->fpmr);
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+}
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+
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static bool target_restore_zt_record(CPUARMState *env,
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struct target_zt_context *zt, int size,
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int svcr)
@@ -610,6 +631,7 @@ static int target_restore_sigframe(CPUARMState *env,
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struct target_tpidr2_context *tpidr2 = NULL;
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struct target_zt_context *zt = NULL;
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struct target_gcs_context *gcs = NULL;
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+ struct target_fpmr_context *fpmr = NULL;
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uint64_t extra_datap = 0;
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bool used_extra = false;
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bool rebuild_hflags = false;
@@ -691,6 +713,15 @@ static int target_restore_sigframe(CPUARMState *env,
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gcs = (struct target_gcs_context *)ctx;
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break;
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+ case TARGET_FPMR_MAGIC:
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+ if (fpmr
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+ || size != sizeof(struct target_fpmr_context)
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+ || !cpu_isar_feature(aa64_fpmr, env_archcpu(env))) {
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+ goto err;
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+ }
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+ fpmr = (struct target_fpmr_context *)ctx;
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+ break;
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+
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case TARGET_EXTRA_MAGIC:
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if (extra || size != sizeof(struct target_extra_context)) {
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goto err;
@@ -735,6 +766,9 @@ static int target_restore_sigframe(CPUARMState *env,
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if (tpidr2) {
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target_restore_tpidr2_record(env, tpidr2);
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}
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+ if (fpmr) {
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+ target_restore_fpmr_record(env, fpmr);
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+ }
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/*
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* NB that we must restore ZT after ZA so the check that there's
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* no ZT record if SVCR.ZA is 0 gets the right value of SVCR.
@@ -817,7 +851,7 @@ static void target_setup_frame(int usig, struct target_sigaction *ka,
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uc.tuc_mcontext.__reserved),
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};
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int fpsimd_ofs, fr_ofs, sve_ofs = 0, za_ofs = 0, tpidr2_ofs = 0;
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- int zt_ofs = 0, esr_ofs = 0, gcs_ofs = 0;
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+ int zt_ofs = 0, esr_ofs = 0, gcs_ofs = 0, fpmr_ofs = 0;
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int sve_size = 0, za_size = 0, tpidr2_size = 0, zt_size = 0;
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struct target_rt_sigframe *frame;
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struct target_rt_frame_record *fr;
@@ -841,6 +875,11 @@ static void target_setup_frame(int usig, struct target_sigaction *ka,
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&layout);
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}
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+ if (cpu_isar_feature(aa64_fpmr, env_archcpu(env))) {
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+ fpmr_ofs = alloc_sigframe_space(sizeof(struct target_fpmr_context),
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+ &layout);
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+ }
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+
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/* SVE state needs saving only if it exists. */
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if (cpu_isar_feature(aa64_sve, env_archcpu(env)) ||
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cpu_isar_feature(aa64_sme, env_archcpu(env))) {
@@ -917,6 +956,9 @@ static void target_setup_frame(int usig, struct target_sigaction *ka,
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!target_setup_gcs_record((void *)frame + gcs_ofs, env, return_addr)) {
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goto give_sigsegv;
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}
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+ if (fpmr_ofs) {
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+ target_setup_fpmr_record((void *)frame + fpmr_ofs, env);
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+ }
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target_setup_end_record((void *)frame + layout.std_end_ofs);
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if (layout.extra_ofs) {
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target_setup_extra_record((void *)frame + layout.extra_ofs,