git: f379ad3de40c - stable/12 - compiler-rt: add aarch64 init function for LSE atomics

The branch stable/12 has been updated by dim:

URL: https://cgit.FreeBSD.org/src/commit/?id=f379ad3de40c781c9fbb4cf840a9a4b53d9b5254

commit f379ad3de40c781c9fbb4cf840a9a4b53d9b5254
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2021-09-06 19:23:10 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2021-12-25 11:51:25 +0000

    compiler-rt: add aarch64 init function for LSE atomics
    
    As reported by Ronald, adding the out-of-line LSE atomics helpers for
    aarch64 to compiler-rt was not sufficient to link programs using these,
    as they also require a __aarch64_have_lse_atomics global. This is
    initialized in compiler-rt's lib/builtins/cpu_model.c, roughly similar
    to the x86 CPU model and feature detection in that file.
    
    Since upstream does not yet have a FreeBSD specific implementation for
    getting the required information, add a simple one that should work for
    now, while I try to get it sorted with the LLVM people.
    
    Reported by:    Ronald Klop <ronald-lists@klop.ws>
    Fixes:          cc55ee8009a5
    PR:             257392
    MFC after:      2 weeks
    
    (cherry picked from commit efe67f33c322265eb303ec0ab40275100795b22a)
---
 contrib/llvm-project/compiler-rt/lib/builtins/cpu_model.c | 6 ++++++
 lib/libcompiler_rt/Makefile.inc                           | 5 +++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/cpu_model.c b/contrib/llvm-project/compiler-rt/lib/builtins/cpu_model.c
index 51bedd98c3d3..13cfeb05dcb8 100644
--- a/contrib/llvm-project/compiler-rt/lib/builtins/cpu_model.c
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/cpu_model.c
@@ -775,8 +775,14 @@ _Bool __aarch64_have_lse_atomics
 #define HWCAP_ATOMICS (1 << 8)
 #endif
 static void CONSTRUCTOR_ATTRIBUTE init_have_lse_atomics(void) {
+#if defined(__FreeBSD__)
+  unsigned long hwcap;
+  int result = elf_aux_info(AT_HWCAP, &hwcap, sizeof hwcap);
+  __aarch64_have_lse_atomics = result == 0 && (hwcap & HWCAP_ATOMICS) != 0;
+#else
   unsigned long hwcap = getauxval(AT_HWCAP);
   __aarch64_have_lse_atomics = (hwcap & HWCAP_ATOMICS) != 0;
+#endif
 }
 #endif // defined(__has_include)
 #endif // __has_include(<sys/auxv.h>)
diff --git a/lib/libcompiler_rt/Makefile.inc b/lib/libcompiler_rt/Makefile.inc
index 5766e835ea38..e9c63910209e 100644
--- a/lib/libcompiler_rt/Makefile.inc
+++ b/lib/libcompiler_rt/Makefile.inc
@@ -146,8 +146,9 @@ SRCF+=		floatundisf
 SRCF+=		floatundixf
 .endif
 
-# __cpu_model support, only used on x86
-.if ${MACHINE_CPUARCH} == "amd64" || ${MACHINE_CPUARCH} == "i386"
+# __cpu_model support, only used on aarch64 and x86
+.if ${MACHINE_CPUARCH} == "aarch64" || ${MACHINE_CPUARCH} == "amd64" || \
+    ${MACHINE_CPUARCH} == "i386"
 SRCF+=		cpu_model
 .endif