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abseil-cpp: Backport xpaclri asm fix

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Native build on aarch64 breaks with:

| {standard input}: Assembler messages:
| {standard input}:169: Error: selected processor does not support `xpaclri'
| {standard input}:411: Error: selected processor does not support `xpaclri'
| {standard input}:859: Error: selected processor does not support `xpaclri'
| {standard input}:1140: Error: selected processor does not support `xpaclri'

Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Signed-off-by: Alex Kiernan <alexk@a-squared-projects.uk>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
This commit is contained in:
Alex Kiernan
2025-03-01 10:36:12 +00:00
committed by Khem Raj
parent 7d46922407
commit cd57f730d6
2 changed files with 33 additions and 0 deletions
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32
meta-oe/recipes-devtools/abseil-cpp/abseil-cpp/0001-Actually-use-the-hint-space-instruction-to-strip-PAC.patch Normal file
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@@ -0,0 +1,32 @@
From 5852b47a81e5334a667d1e12dbfa55c0f8111100 Mon Sep 17 00:00:00 2001
From: Derek Mauro <dmauro@google.com>
Date: Fri, 7 Feb 2025 08:49:06 -0800
Subject: [PATCH] Actually use the hint space instruction to strip PAC bits for
return addresses in stack traces as the comment says
https://android.googlesource.com/platform/libcore/+/71f2c75111e87091616f0f3b86bea6c4d345dad1/src/hotspot/os_cpu/linux_aarch64/pauth_linux_aarch64.inline.hpp
PiperOrigin-RevId: 724360415
Change-Id: I691160e43354131a04919765ce283e07c3c933a9
Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Signed-off-by: Alex Kiernan <alexk@a-squared-projects.uk>
Upstream-Status: Backport [https://github.com/abseil/abseil-cpp/commit/5852b47a81e5334a667d1e12dbfa55c0f8111100]
---
absl/debugging/internal/stacktrace_aarch64-inl.inc | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/absl/debugging/internal/stacktrace_aarch64-inl.inc b/absl/debugging/internal/stacktrace_aarch64-inl.inc
index 4490c4e13cae..dccadaeb7c24 100644
--- a/absl/debugging/internal/stacktrace_aarch64-inl.inc
+++ b/absl/debugging/internal/stacktrace_aarch64-inl.inc
@@ -188,7 +188,9 @@ inline void* ClearPacBits(void* ptr) {
// compatibility with ARM platforms that do not support pointer
// authentication, we use the hint space instruction XPACLRI instead. Hint
// space instructions behave as NOPs on unsupported platforms.
- asm("xpaclri" : "+r"(x30));
+#define ABSL_XPACLRI_HINT "hint #0x7;"
+ asm(ABSL_XPACLRI_HINT : "+r"(x30)); // asm("xpaclri" : "+r"(x30));
+#undef ABSL_XPACLRI_HINT
return x30;
}

1
meta-oe/recipes-devtools/abseil-cpp/abseil-cpp_20250127.0.bb
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@@ -14,6 +14,7 @@ SRC_URI = "git://github.com/abseil/abseil-cpp;branch=${BRANCH};protocol=https \
file://0002-Remove-maes-option-from-cross-compilation.patch \
file://0003-Remove-neon-option-from-cross-compilation.patch \
file://0004-abseil-ppc-fixes.patch \
file://0001-Actually-use-the-hint-space-instruction-to-strip-PAC.patch \
"
S = "${WORKDIR}/git"