Alternate fix for assertion on armv7hl (RHBZ#1999878)
This commit is contained in:
Richard W.M. Jones
parent
c5273992ba
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From 1331e4eec016a295949009b4360c592401b089f7 Mon Sep 17 00:00:00 2001
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From: Richard Henderson <richard.henderson@linaro.org>
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Date: Sun, 12 Sep 2021 10:49:25 -0700
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Subject: [PATCH] tcg/arm: Reduce vector alignment requirement for NEON
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With arm32, the ABI gives us 8-byte alignment for the stack.
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While it's possible to realign the stack to provide 16-byte alignment,
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it's far easier to simply not encode 16-byte alignment in the
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VLD1 and VST1 instructions that we emit.
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Remove the assertion in temp_allocate_frame, limit natural alignment
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to the provided stack alignment, and add a comment.
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Reported-by: Richard W.M. Jones <rjones@redhat.com>
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Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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---
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tcg/arm/tcg-target.c.inc | 13 +++++++++----
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tcg/tcg.c | 8 +++++++-
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2 files changed, 16 insertions(+), 5 deletions(-)
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diff --git a/tcg/arm/tcg-target.c.inc b/tcg/arm/tcg-target.c.inc
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index 007ceee68e..34acfb522c 100644
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--- a/tcg/arm/tcg-target.c.inc
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+++ b/tcg/arm/tcg-target.c.inc
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@@ -2477,8 +2477,13 @@ static void tcg_out_ld(TCGContext *s, TCGType type, TCGReg arg,
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tcg_out_vldst(s, INSN_VLD1 | 0x7d0, arg, arg1, arg2);
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return;
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case TCG_TYPE_V128:
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- /* regs 2; size 8; align 16 */
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- tcg_out_vldst(s, INSN_VLD1 | 0xae0, arg, arg1, arg2);
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+ /*
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+ * We have only 8-byte alignment for the stack per the ABI.
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+ * Rather than dynamically re-align the stack, it's easier
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+ * to simply not request alignment beyond that. So:
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+ * regs 2; size 8; align 8
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+ */
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+ tcg_out_vldst(s, INSN_VLD1 | 0xad0, arg, arg1, arg2);
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return;
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default:
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g_assert_not_reached();
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@@ -2497,8 +2502,8 @@ static void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg,
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tcg_out_vldst(s, INSN_VST1 | 0x7d0, arg, arg1, arg2);
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return;
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case TCG_TYPE_V128:
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- /* regs 2; size 8; align 16 */
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- tcg_out_vldst(s, INSN_VST1 | 0xae0, arg, arg1, arg2);
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+ /* See tcg_out_ld re alignment: regs 2; size 8; align 8 */
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+ tcg_out_vldst(s, INSN_VST1 | 0xad0, arg, arg1, arg2);
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return;
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default:
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g_assert_not_reached();
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diff --git a/tcg/tcg.c b/tcg/tcg.c
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index 4142d42d77..ca5bcc4635 100644
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--- a/tcg/tcg.c
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+++ b/tcg/tcg.c
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@@ -3060,7 +3060,13 @@ static void temp_allocate_frame(TCGContext *s, TCGTemp *ts)
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g_assert_not_reached();
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}
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- assert(align <= TCG_TARGET_STACK_ALIGN);
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+ /*
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+ * Assume the stack is sufficiently aligned.
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+ * This affects e.g. ARM NEON, where we have 8 byte stack alignment
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+ * and do not require 16 byte vector alignment. This seems slightly
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+ * easier than fully parameterizing the above switch statement.
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+ */
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+ align = MIN(TCG_TARGET_STACK_ALIGN, align);
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off = ROUND_UP(s->current_frame_offset, align);
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/* If we've exhausted the stack frame, restart with a smaller TB. */
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--
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2.32.0
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@ -1,32 +0,0 @@
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From 319935db129085bf4a3886dfd5662c687e6ce814 Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Wed, 1 Sep 2021 17:12:20 +0100
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Subject: [PATCH 2/2] tcg/arm: Increase stack alignment for function generation
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This avoids the following assertion when the kernel initializes X.509
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certificates:
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[ 7.315373] Loading compiled-in X.509 certificates
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qemu-system-arm: ../tcg/tcg.c:3063: temp_allocate_frame: Assertion `align <= TCG_TARGET_STACK_ALIGN' failed.
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Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
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---
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tcg/arm/tcg-target.h | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/tcg/arm/tcg-target.h b/tcg/arm/tcg-target.h
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index d113b7f8db..5c8f3f8c55 100644
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--- a/tcg/arm/tcg-target.h
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+++ b/tcg/arm/tcg-target.h
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@@ -115,7 +115,7 @@ extern bool use_neon_instructions;
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#endif
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/* used for function call generation */
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-#define TCG_TARGET_STACK_ALIGN 8
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+#define TCG_TARGET_STACK_ALIGN 16
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#define TCG_TARGET_CALL_ALIGN_ARGS 1
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#define TCG_TARGET_CALL_STACK_OFFSET 0
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--
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2.32.0
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@ -282,7 +282,7 @@ Obsoletes: %{name}-system-unicore32-core <= %{epoch}:%{version}-%{release}
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Summary: QEMU is a FAST! processor emulator
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Name: qemu
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Version: 6.1.0
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Release: 6%{?rcrel}%{?dist}
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Release: 7%{?rcrel}%{?dist}
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Epoch: 2
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License: GPLv2 and BSD and MIT and CC-BY
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URL: http://www.qemu.org/
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@ -306,7 +306,7 @@ Patch1: 0001-target-i386-add-missing-bits-to-CR4_RESERVED_MASK.patch
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# Fix assertion on armv7hl
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# https://bugzilla.redhat.com/show_bug.cgi?id=1999878
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Patch2: 0002-tcg-arm-Increase-stack-alignment-for-function-genera.patch
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Patch2: 0001-tcg-arm-Reduce-vector-alignment-requirement-for-NEON.patch
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BuildRequires: meson >= %{meson_version}
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BuildRequires: zlib-devel
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@ -2236,6 +2236,9 @@ useradd -r -u 107 -g qemu -G kvm -d / -s /sbin/nologin \
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%changelog
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* Sun Sep 12 2021 Richard W.M. Jones <rjones@redhat.com> - 6.1.0-7
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- Alternate fix for assertion on armv7hl (RHBZ#1999878)
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* Wed Sep 01 2021 Richard W.M. Jones <rjones@redhat.com> - 6.1.0-6
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- Fix assertion on armv7hl (RHBZ#1999878)
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