如何在iOS上运行时确定ARMv8功能？

Question

我试图确定何时在运行时iOS上可用的可选ARMv8 cpu功能.在OS X桌面上,我们可以使用i686,x86_64,PPC和PPC64 sysctl.例如,请参阅Mac OS X上的PR 3108,无SIGILL处理器功能检测.

在"自由SIGILL处理器能力"部分是重要的,因为SIGILL基于特征探讨在苹果的平台来破坏内存.我遵循的至少三个项目都遇到了问题,包括Crypto ++和OpenSSL.问题的另一部分是像Apple Clang在Xcode 10下缺少ARMv8/Aarch64的CRC32这样的问题吗？,应该存在的核心ARMv8功能似乎缺失或不受支持.

我已经找到了相当于OS X台式机的iOS,但我找不到它们(见下文).

我们真的更喜欢避免像CommonCrypto这样的Apple框架.我们努力保持平台不可知.我们不使用CommonCrypto,但如果没有任何不可知的东西(我正在制作它),我会考虑使用下面的Apple函数:

BOOL CCHasAes();
BOOL CCHasSHA1();
BOOL CCHasSHA2();

Apple是否发布了一种在运行时确定cpu功能的方法？

我们如何在iOS上确定运行时的cpu功能？

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这些可能是相关的,但我不确定这是否是我们拥有的最好的,或者这是我们唯一拥有的,或者是否还有其他方法可以解决它.

• 在iOS9中使用"hw.machine"标志调用"sysctlbyname(...)".
• 如何在iOS上获取设备制作和型号？

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下面我正在寻找CRC-32,CRC-32C,AES,PMULL,SHA1和SHA2功能.我没有看到任何类似于我正在寻找的点击.Apple自Xcode 7起支持ARMv8,因此8.2支持CPU.

$ grep -IR CTL_ /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.2.sdk | \
  sed 's|/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.2.sdk/usr/include|...|g'
.../c++/4.2.1/bits/c++config.h:#define _GLIBCXX_HAVE_SYS_IOCTL_H 1
.../netinet/in.h:#define        IPCTL_FORWARDING        1       /* act as router */
.../netinet/in.h:#define        IPCTL_SENDREDIRECTS     2       /* may send redirects when forwarding */
.../netinet/in.h:#define        IPCTL_DEFTTL            3       /* default TTL */
.../netinet/in.h:#define        IPCTL_DEFMTU            4       /* default MTU */
.../netinet/in.h:#define IPCTL_RTEXPIRE         5       /* cloned route expiration time */
.../netinet/in.h:#define IPCTL_RTMINEXPIRE      6       /* min value for expiration time */
.../netinet/in.h:#define IPCTL_RTMAXCACHE       7       /* trigger level for dynamic expire */
.../netinet/in.h:#define        IPCTL_SOURCEROUTE       8       /* may perform source routes */
.../netinet/in.h:#define        IPCTL_DIRECTEDBROADCAST 9       /* may re-broadcast received packets */
.../netinet/in.h:#define IPCTL_INTRQMAXLEN      10      /* max length of netisr queue */
.../netinet/in.h:#define        IPCTL_INTRQDROPS        11      /* number of netisr q drops */
.../netinet/in.h:#define        IPCTL_STATS             12      /* ipstat structure */
.../netinet/in.h:#define        IPCTL_ACCEPTSOURCEROUTE 13      /* may accept source routed packets */
.../netinet/in.h:#define        IPCTL_FASTFORWARDING    14      /* use fast IP forwarding code */
.../netinet/in.h:#define        IPCTL_KEEPFAITH         15      /* deprecated */
.../netinet/in.h:#define        IPCTL_GIF_TTL           16      /* default TTL for gif encap packet */
.../netinet/in.h:#define        IPCTL_MAXID             17
.../netinet6/in6.h:#define      IPV6CTL_FORWARDING      1       /* act as router */
.../netinet6/in6.h:#define      IPV6CTL_SENDREDIRECTS   2       /* may send redirects when forwarding */
.../netinet6/in6.h:#define      IPV6CTL_DEFHLIM         3       /* default Hop-Limit */
.../netinet6/in6.h:#define      IPV6CTL_DEFMTU          4       /* default MTU */
.../netinet6/in6.h:#define      IPV6CTL_FORWSRCRT       5       /* forward source-routed dgrams */
.../netinet6/in6.h:#define      IPV6CTL_STATS           6       /* stats */
.../netinet6/in6.h:#define      IPV6CTL_MRTSTATS        7       /* multicast forwarding stats */
.../netinet6/in6.h:#define      IPV6CTL_MRTPROTO        8       /* multicast routing protocol */
.../netinet6/in6.h:#define      IPV6CTL_MAXFRAGPACKETS  9       /* max packets reassembly queue */
.../netinet6/in6.h:#define      IPV6CTL_SOURCECHECK     10      /* verify source route and intf */
.../netinet6/in6.h:#define      IPV6CTL_SOURCECHECK_LOGINT 11   /* minimume logging interval */
.../netinet6/in6.h:#define      IPV6CTL_ACCEPT_RTADV    12
.../netinet6/in6.h:#define      IPV6CTL_KEEPFAITH       13      /* deprecated */
.../netinet6/in6.h:#define      IPV6CTL_LOG_INTERVAL    14
.../netinet6/in6.h:#define      IPV6CTL_HDRNESTLIMIT    15
.../netinet6/in6.h:#define      IPV6CTL_DAD_COUNT       16
.../netinet6/in6.h:#define      IPV6CTL_AUTO_FLOWLABEL  17
.../netinet6/in6.h:#define      IPV6CTL_DEFMCASTHLIM    18
.../netinet6/in6.h:#define      IPV6CTL_GIF_HLIM        19      /* default HLIM for gif encap packet */
.../netinet6/in6.h:#define      IPV6CTL_KAME_VERSION    20
.../netinet6/in6.h:#define      IPV6CTL_USE_DEPRECATED  21      /* use deprec addr (RFC2462 5.5.4) */
.../netinet6/in6.h:#define      IPV6CTL_RR_PRUNE        22      /* walk timer for router renumbering */
.../netinet6/in6.h:#define      IPV6CTL_MAPPED_ADDR     23
.../netinet6/in6.h:#define      IPV6CTL_V6ONLY          24
.../netinet6/in6.h:#define      IPV6CTL_RTEXPIRE        25      /* cloned route expiration time */
.../netinet6/in6.h:#define      IPV6CTL_RTMINEXPIRE     26      /* min value for expiration time */
.../netinet6/in6.h:#define      IPV6CTL_RTMAXCACHE      27      /* trigger level for dynamic expire */
.../netinet6/in6.h:#define      IPV6CTL_USETEMPADDR     32      /* use temporary addresses [RFC 4941] */
.../netinet6/in6.h:#define      IPV6CTL_TEMPPLTIME      33      /* preferred lifetime for tmpaddrs */
.../netinet6/in6.h:#define      IPV6CTL_TEMPVLTIME      34      /* valid lifetime for tmpaddrs */
.../netinet6/in6.h:#define      IPV6CTL_AUTO_LINKLOCAL  35      /* automatic link-local addr assign */
.../netinet6/in6.h:#define      IPV6CTL_RIP6STATS       36      /* raw_ip6 stats */
.../netinet6/in6.h:#define      IPV6CTL_PREFER_TEMPADDR 37      /* prefer temporary addr as src */
.../netinet6/in6.h:#define      IPV6CTL_ADDRCTLPOLICY   38      /* get/set address selection policy */
.../netinet6/in6.h:#define      IPV6CTL_USE_DEFAULTZONE 39      /* use default scope zone */
.../netinet6/in6.h:#define      IPV6CTL_MAXFRAGS        41      /* max fragments */
.../netinet6/in6.h:#define      IPV6CTL_MCAST_PMTU      44      /* enable pMTU discovery for mcast? */
.../netinet6/in6.h:#define      IPV6CTL_NEIGHBORGCTHRESH 46
.../netinet6/in6.h:#define      IPV6CTL_MAXIFPREFIXES   47
.../netinet6/in6.h:#define      IPV6CTL_MAXIFDEFROUTERS 48
.../netinet6/in6.h:#define      IPV6CTL_MAXDYNROUTES    49
.../netinet6/in6.h:#define      ICMPV6CTL_ND6_ONLINKNSRFC4861   50
.../netinet6/in6.h:/* New entries should be added here from current IPV6CTL_MAXID value. */
.../netinet6/in6.h:#define      IPV6CTL_MAXID           51
.../sys/ioctl.h:#ifndef _SYS_IOCTL_H_
.../sys/ioctl.h:#define _SYS_IOCTL_H_
.../sys/ioctl.h:#endif /* !_SYS_IOCTL_H_ */
.../sys/ioctl.h: * Keep outside _SYS_IOCTL_H_
.../sys/ioctl.h:#endif /* !_SYS_IOCTL_H_ */
.../sys/mount.h: * Sysctl CTL_VFS definitions.
.../sys/mount.h:        int             vc_vers;        /* should be VFSIDCTL_VERS1 (below) */
.../sys/mount.h:#define VFS_CTL_VERS1   0x01
.../sys/mount.h:#define VFS_CTL_STATFS  0x00010001      /* statfs */
.../sys/mount.h:#define VFS_CTL_UMOUNT  0x00010002      /* unmount */
.../sys/mount.h:#define VFS_CTL_QUERY   0x00010003      /* anything wrong? (vfsquery) */
.../sys/mount.h:#define VFS_CTL_NEWADDR 0x00010004      /* reconnect to new address */
.../sys/mount.h:#define VFS_CTL_TIMEO   0x00010005      /* set timeout for vfs notification */
.../sys/mount.h:#define VFS_CTL_NOLOCKS 0x00010006      /* disable file locking */
.../sys/mount.h:#define VFS_CTL_SADDR   0x00010007      /* get server address */
.../sys/mount.h:#define VFS_CTL_DISC    0x00010008      /* server disconnected */
.../sys/mount.h:#define VFS_CTL_SERVERINFO  0x00010009  /* information about fs server */
.../sys/mount.h:#define VFS_CTL_NSTATUS 0x0001000A      /* netfs mount status */
.../sys/mount.h: * NetFS mount status - returned by VFS_CTL_NSTATUS
.../sys/socket.h: * Definitions for network related sysctl, CTL_NET.
.../sys/sysctl.h:#ifndef _SYS_SYSCTL_H_
.../sys/sysctl.h:#define        _SYS_SYSCTL_H_
.../sys/sysctl.h:#define CTL_MAXNAME    12      /* largest number of components supported */
.../sys/sysctl.h: *                     SYSCTL_OUT(rey, local buffer, length)
.../sys/sysctl.h: * e.g. SYSCTL_INT(_parent, OID_AUTO, name, CTLFLAG_RW, &variable, 0, "");
.../sys/sysctl.h:#define SYSCTL_DEF_ENABLED
.../sys/sysctl.h:#ifdef SYSCTL_DEF_ENABLED
.../sys/sysctl.h:#define        CTL_UNSPEC      0               /* unused */
.../sys/sysctl.h:#define        CTL_KERN        1               /* "high kernel": proc, limits */
.../sys/sysctl.h:#define        CTL_VM          2               /* virtual memory */
.../sys/sysctl.h:#define        CTL_VFS         3               /* file system, mount type is next */
.../sys/sysctl.h:#define        CTL_NET         4               /* network, see socket.h */
.../sys/sysctl.h:#define        CTL_DEBUG       5               /* debugging parameters */
.../sys/sysctl.h:#define        CTL_HW          6               /* generic cpu/io */
.../sys/sysctl.h:#define        CTL_MACHDEP     7               /* machine dependent */
.../sys/sysctl.h:#define        CTL_USER        8               /* user-level */
.../sys/sysctl.h:#define        CTL_MAXID       9               /* number of valid top-level ids */
.../sys/sysctl.h:#define CTL_NAMES { \
.../sys/sysctl.h: * CTL_KERN identifiers
.../sys/sysctl.h: * Don't add any more sysctls like this.  Instead, use the SYSCTL_*() macros
.../sys/sysctl.h:#define CTL_KERN_NAMES { \
.../sys/sysctl.h: * CTL_VFS identifiers
.../sys/sysctl.h:#define CTL_VFS_NAMES { \
.../sys/sysctl.h: * CTL_VM identifiers
.../sys/sysctl.h:#define        CTL_VM_NAMES { \
.../sys/sysctl.h: * CTL_HW identifiers
.../sys/sysctl.h:#define CTL_HW_NAMES { \
.../sys/sysctl.h: * CTL_USER definitions
.../sys/sysctl.h:#define        CTL_USER_NAMES { \
.../sys/sysctl.h: * CTL_DEBUG definitions
.../sys/sysctl.h:#define        CTL_DEBUG_NAME          0       /* string: variable name */
.../sys/sysctl.h:#define        CTL_DEBUG_VALUE         1       /* int: variable value */
.../sys/sysctl.h:#define        CTL_DEBUG_MAXID         20
.../sys/sysctl.h:#if (CTL_MAXID != 9) || (KERN_MAXID != 72) || (VM_MAXID != 6) || (HW_MAXID != 26) || (USER_MAXID != 21) || (CTL_DEBUG_MAXID != 20)
.../sys/sysctl.h:#error Use the SYSCTL_*() macros and OID_AUTO instead!
.../sys/sysctl.h:#endif /* SYSCTL_DEF_ENABLED */
.../sys/sysctl.h:#endif /* !_SYS_SYSCTL_H_ */
.../sys/termios.h:#if !defined(_SYS_IOCTL_COMPAT_H_) || __DARWIN_UNIX03
.../sys/termios.h:#endif        /* !_SYS_IOCTL_COMPAT_H_ */

Answer 1

据我所知，苹果今年将取消对 32 位芯片的支持。由于 Apple A7 处理器 Apple 在其 SoC 中使用 ArmV8-A 内核...所以也许您无法通过新的 API 选择它们，因为您没有什么可选择的...Apple 通常对此类事情很神秘，并且在某些情况下使用自动切换移动平台上的功能。然而，基本上每个 iOS 11 SoC 都将具有相同的基本硬件功能，除了核心数量和能源管理（对于 SoC >= A10 Fusion 是不同的）。一个月前我也在寻找同样的东西，但显然在 iOS 上你必须掌握在操作系统的手中。