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[PULL 31/45] target/arm: Reset streaming sve state on exception boundari
From: |
Peter Maydell |
Subject: |
[PULL 31/45] target/arm: Reset streaming sve state on exception boundaries |
Date: |
Mon, 11 Jul 2022 14:57:36 +0100 |
From: Richard Henderson <richard.henderson@linaro.org>
We can handle both exception entry and exception return by
hooking into aarch64_sve_change_el.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220708151540.18136-32-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
target/arm/helper.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 73a5b2b86d9..cfcad97ce07 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -11242,6 +11242,19 @@ void aarch64_sve_change_el(CPUARMState *env, int
old_el,
return;
}
+ old_a64 = old_el ? arm_el_is_aa64(env, old_el) : el0_a64;
+ new_a64 = new_el ? arm_el_is_aa64(env, new_el) : el0_a64;
+
+ /*
+ * Both AArch64.TakeException and AArch64.ExceptionReturn
+ * invoke ResetSVEState when taking an exception from, or
+ * returning to, AArch32 state when PSTATE.SM is enabled.
+ */
+ if (old_a64 != new_a64 && FIELD_EX64(env->svcr, SVCR, SM)) {
+ arm_reset_sve_state(env);
+ return;
+ }
+
/*
* DDI0584A.d sec 3.2: "If SVE instructions are disabled or trapped
* at ELx, or not available because the EL is in AArch32 state, then
@@ -11254,10 +11267,8 @@ void aarch64_sve_change_el(CPUARMState *env, int
old_el,
* we already have the correct register contents when encountering the
* vq0->vq0 transition between EL0->EL1.
*/
- old_a64 = old_el ? arm_el_is_aa64(env, old_el) : el0_a64;
old_len = (old_a64 && !sve_exception_el(env, old_el)
? sve_vqm1_for_el(env, old_el) : 0);
- new_a64 = new_el ? arm_el_is_aa64(env, new_el) : el0_a64;
new_len = (new_a64 && !sve_exception_el(env, new_el)
? sve_vqm1_for_el(env, new_el) : 0);
--
2.25.1
- [PULL 12/45] target/arm: Mark gather prefetch as non-streaming, (continued)
- [PULL 12/45] target/arm: Mark gather prefetch as non-streaming, Peter Maydell, 2022/07/11
- [PULL 02/45] target/arm: Add infrastructure for disas_sme, Peter Maydell, 2022/07/11
- [PULL 09/45] target/arm: Mark SMMLA, UMMLA, USMMLA as non-streaming, Peter Maydell, 2022/07/11
- [PULL 06/45] target/arm: Mark BDEP, BEXT, BGRP, COMPACT, FEXPA, FTSSEL as non-streaming, Peter Maydell, 2022/07/11
- [PULL 16/45] target/arm: Handle SME in sve_access_check, Peter Maydell, 2022/07/11
- [PULL 19/45] target/arm: Implement SME MOVA, Peter Maydell, 2022/07/11
- [PULL 21/45] target/arm: Export unpredicated ld/st from translate-sve.c, Peter Maydell, 2022/07/11
- [PULL 24/45] target/arm: Implement FMOPA, FMOPS (non-widening), Peter Maydell, 2022/07/11
- [PULL 17/45] target/arm: Implement SME RDSVL, ADDSVL, ADDSPL, Peter Maydell, 2022/07/11
- [PULL 26/45] target/arm: Implement FMOPA, FMOPS (widening), Peter Maydell, 2022/07/11
- [PULL 31/45] target/arm: Reset streaming sve state on exception boundaries,
Peter Maydell <=
- [PULL 33/45] linux-user/aarch64: Clear tpidr2_el0 if CLONE_SETTLS, Peter Maydell, 2022/07/11
- [PULL 37/45] linux-user/aarch64: Do not allow duplicate or short sve records, Peter Maydell, 2022/07/11
- [PULL 34/45] linux-user/aarch64: Reset PSTATE.SM on syscalls, Peter Maydell, 2022/07/11
- [PULL 30/45] target/arm: Implement SCLAMP, UCLAMP, Peter Maydell, 2022/07/11
- [PULL 36/45] linux-user/aarch64: Tidy target_restore_sigframe error return, Peter Maydell, 2022/07/11
- [PULL 39/45] linux-user/aarch64: Move sve record checks into restore, Peter Maydell, 2022/07/11
- [PULL 35/45] linux-user/aarch64: Add SM bit to SVE signal context, Peter Maydell, 2022/07/11
- [PULL 44/45] target/arm: Enable SME for user-only, Peter Maydell, 2022/07/11
- [PULL 28/45] target/arm: Implement PSEL, Peter Maydell, 2022/07/11
- [PULL 20/45] target/arm: Implement SME LD1, ST1, Peter Maydell, 2022/07/11