1 files changed, 57 insertions, 0 deletions
diff --git a/devel/electron13/files/patch-third__party_crc32c_src_src_crc32c__arm64__linux__check.h b/devel/electron13/files/patch-third__party_crc32c_src_src_crc32c__arm64__linux__check.h
new file mode 100644
index 000000000000..5d5511987d2f
--- /dev/null
+++ b/devel/electron13/files/patch-third__party_crc32c_src_src_crc32c__arm64__linux__check.h
@@ -0,0 +1,57 @@
+--- third_party/crc32c/src/src/crc32c_arm64_linux_check.h.orig	2021-01-07 00:39:27 UTC
++++ third_party/crc32c/src/src/crc32c_arm64_linux_check.h
+@@ -7,8 +7,6 @@
+ #ifndef CRC32C_CRC32C_ARM_LINUX_CHECK_H_
+ #define CRC32C_CRC32C_ARM_LINUX_CHECK_H_
+ 
+-// X86-specific code checking for the availability of SSE4.2 instructions.
+-
+ #include <cstddef>
+ #include <cstdint>
+ 
+@@ -16,30 +14,25 @@
+ 
+ #if HAVE_ARM64_CRC32C
+ 
+-#if HAVE_STRONG_GETAUXVAL
+-#include <sys/auxv.h>
+-#elif HAVE_WEAK_GETAUXVAL
+-// getauxval() is not available on Android until API level 20. Link it as a weak
+-// symbol.
+-extern "C" unsigned long getauxval(unsigned long type) __attribute__((weak));
++#include <sys/types.h>
++#include <machine/armreg.h>
+ 
+-#define AT_HWCAP 16
+-#endif  // HAVE_STRONG_GETAUXVAL || HAVE_WEAK_GETAUXVAL
++#ifndef ID_AA64ISAR0_AES_VAL
++#define ID_AA64ISAR0_AES_VAL ID_AA64ISAR0_AES
++#endif
++#ifndef ID_AA64ISAR0_CRC32_VAL
++#define ID_AA64ISAR0_CRC32_VAL ID_AA64ISAR0_CRC32
++#endif
+ 
+ namespace crc32c {
+ 
+-inline bool CanUseArm64Linux() {
+-#if HAVE_STRONG_GETAUXVAL || HAVE_WEAK_GETAUXVAL
+-  // From 'arch/arm64/include/uapi/asm/hwcap.h' in Linux kernel source code.
+-  constexpr unsigned long kHWCAP_PMULL = 1 << 4;
+-  constexpr unsigned long kHWCAP_CRC32 = 1 << 7;
+-  unsigned long hwcap = (&getauxval != nullptr) ? getauxval(AT_HWCAP) : 0;
+-  return (hwcap & (kHWCAP_PMULL | kHWCAP_CRC32)) ==
+-         (kHWCAP_PMULL | kHWCAP_CRC32);
+-#else
+-  return false;
+-#endif  // HAVE_STRONG_GETAUXVAL || HAVE_WEAK_GETAUXVAL
+-}
++  inline bool CanUseArm64Linux() {
++    uint64_t id_aa64isar0;
++  
++    id_aa64isar0 = READ_SPECIALREG(id_aa64isar0_el1);
++    return ((ID_AA64ISAR0_AES_VAL(id_aa64isar0) == ID_AA64ISAR0_AES_PMULL) &&
++      (ID_AA64ISAR0_CRC32_VAL(id_aa64isar0) == ID_AA64ISAR0_CRC32_BASE));
++  }
+ 
+ }  // namespace crc32c
+