Rosetta (software)

Source: Wikipedia, the free encyclopedia.
For other software products or projects named "Rosetta", see Rosetta Stone (software) and Rosetta (disambiguation).

Rosetta
Developer(s)Apple Inc.
Operating systemMac OS X 10.4.4–10.6.8 (Intel)
macOS 11.0–present (ARM)
Linux guest[1]
TypeBinary translation, emulation

Rosetta is a

Egyptian hieroglyphs.[2]

The first version of Rosetta, introduced in 2006 in

Mac OS X Lion (10.7)
in 2011.

Rosetta 2, introduced in 2020 as a component of macOS Big Sur, is part of the Mac transition from Intel processors to Apple silicon, allowing Intel applications to run on Apple silicon-based Macs.[3]

Background

ARM64 in Apple silicon. Each instruction set architecture is incompatible with its predecessor, necessitating a transition plan based on a software layer to emulate
the previous instruction set on the succeeding one.

With the launch of

Mac 68K emulator is part of System 7.1.2 and later. This emulator uses PowerPC features and is embedded at the lowest levels of the operating system, integrated with the Mac OS nanokernel. This means that the nanokernel is able to intercept PowerPC interrupts, translate them to 68k interrupts (then doing a mixed mode switch, if necessary), and then execute 68k code to handle the interrupts. This allows 68k and PowerPC code to be interspersed within the same fat binary
.

Rosetta

Mac transition to
Intel processors
Intel mobile processor

Apple launched Rosetta in 2006 upon the

Mac OS X Lion (10.7) or later, which therefore cannot run PowerPC applications.[6]

Because of the greater architectural differences between Intel and PowerPC processors, Rosetta operates at a higher level than the 68000 emulator does, as a

G5 instructions. Although most commercial software for PowerPC-based Macs was compatible with these requirements (G4 systems were still widely used at the time), any applications that relied on G5-specific instructions had to be modified by their developers to work on Rosetta-supported Intel-based Macs. Apple advised that applications with heavy user interaction but low computational needs (such as word processors) would be best suited to use with Rosetta, and applications with high computational needs (such as games, AutoCAD, or Photoshop) would not.[7] Pre-existing PowerPC versions of Apple "Pro" media-production applications (such as Final Cut Pro, Motion, Aperture, and Logic Pro) are not supported by Rosetta and require a "crossgrade"[8] to a universal binary
version to work on Rosetta-supported Intel-based Macs.

Rosetta also does not support the following:[9]

Rosetta 2

Mac transition to
Apple silicon
Processor designed by Apple (M1)

In 2020, Apple announced Rosetta 2 would be bundled with macOS Big Sur, to aid in the Mac transition to Apple silicon. The software permits many applications compiled exclusively for execution on x86-64-based processors to be translated for execution on Apple silicon.[3][10]

To install Rosetta 2 on an Apple silicon Mac there are two ways to do it: either by using the Terminal to install the program directly, or by trying to open an application compiled for x86-64, which will open an installation window.

In addition to the just-in-time (JIT) translation support, Rosetta 2 offers ahead-of-time compilation (AOT), with the x86-64 code fully translated, just once, when an application without a universal binary is installed on an Apple silicon Mac.[11]

Rosetta 2's performance has been praised greatly.[12][13] In some benchmarks, x86-64-only programs performed better under Rosetta 2 on a Mac with an Apple M1 SOC than natively on a Mac with an Intel x86-64 processor. One of the key reasons why Rosetta 2 provides such a high level of translation efficiency is the support of x86-64 memory ordering in the Apple M1 SOC.[14] The SOC also has dedicated instructions for computing x86 flags.[15]

Although Rosetta 2 works for most software, some software doesn't work at all[16] or is reported to be "sluggish".[17]

Similar to the first version, Rosetta 2 does not normally require user intervention. When a user attempts to launch an x86-64-only application for the first time, macOS prompts them to install Rosetta 2 if it is not already available. Subsequent launches of x86-64 programs will execute via translation automatically. An option also exists to force a universal binary to run as x86-64 code through Rosetta 2, even on an ARM-based machine.[18]

Since

ARMv8.2-A instruction set; the memory ordering will be different from native x86. Some developers have noted that it might violate macOS's licensing agreements, since the runtime is bundled[21]
within Apple's Virtualization framework.

See also

  • Fat binary § Apple's fat binary – combined 68k/PPC applications that run natively on both processors
  • Universal binary – combined PPC/Intel applications that run natively on both processors
  • Universal 2 binary
    – combined Intel/ARM applications that run natively on both processors

References

  1. Apple Inc
    . Retrieved August 7, 2022.
  2. ^ Norr, Henry (January 27, 2006). "Core Duo iMacs debut speedy new chips". Macworld.
  3. ^ a b Warren, Tom (June 22, 2020). "Apple is switching Macs to its own processors starting later this year". The Verge. Retrieved June 22, 2020.
  4. ^ "The brains behind Apple's Rosetta: Transitive". CNET. June 8, 2005. Retrieved January 9, 2023.
  5. ^ "Rosetta". Apple. Archived from the original on January 13, 2006. Retrieved September 5, 2011.
  6. ^
    AppleInsider. AppleInsider, Inc. Archived
    from the original on April 29, 2014. Retrieved February 27, 2011.
  7. ^ "Rosetta" (PDF). Universal Binary Programming Guidelines, Second Edition. Apple. Archived from the original (PDF) on August 3, 2012. Retrieved September 5, 2011.
  8. ^ "Universal Applications". Apple. Archived from the original on March 3, 2016. Retrieved August 5, 2019.
  9. ^ "What Can Be Translated?" (PDF). Universal Binary Programming Guidelines, Second Edition. Apple. Archived from the original (PDF) on August 3, 2012. Retrieved September 5, 2011.
  10. ^ Mayo, Benjamin (June 22, 2020). "Apple announces Mac architecture transition from Intel to its own ARM chips, offers emulation path". 9to5Mac. Retrieved June 23, 2020.
  11. ^ WWDC2020 Keynote. Apple Inc. June 22, 2020. Event occurs at 1h39m37s. It translates the apps when you install them, so they can launch immediately and can be instantly responsive. Rosetta 2 can also translate code on the fly when needed.
  12. ^ Evans, Jonny (November 19, 2020). "Everything you need to know about Rosetta 2 on Apple Silicon Macs". Computerworld. Retrieved December 8, 2020.
  13. ^ "Yeah, Apple's M1 MacBook Pro is powerful, but it's the battery life that will blow you away". TechCrunch. November 17, 2020. Retrieved December 8, 2020.
  14. ^ @ErrataRob (November 25, 2020). "4/ So Apple simply cheated. They added Intel's memory-ordering to their CPU. When running translated x86 code, they switch the mode of the CPU to conform to Intel's memory ordering" (Tweet) – via Twitter.
  15. ^ Dougall, J (November 9, 2022). "Why is Rosetta 2 fast?". Retrieved August 15, 2023. ARM flag-manipulation extensions... Apple's secret extension...
  16. ^ Carlton, Sam (December 8, 2020). "ThatGuySam/doesitarm". GitHub. Retrieved December 8, 2020.
  17. ^ "r/mac - Apps on Rosetta 2". reddit. November 29, 2020. Retrieved December 8, 2020.
  18. ^ "Use Office for Mac with Rosetta and Apple silicon". support.microsoft.com. Retrieved June 21, 2021.
  19. ^ Proven, Liam (June 9, 2022). "Apple offers improved Linux support in macOS 13". The Register. Retrieved January 6, 2023.
  20. ^ Cunningham, Andrew (June 7, 2022). "Apple will allow Linux VMs to run Intel apps with Rosetta in macOS Ventura". Ars Technica. Retrieved January 6, 2023.
  21. ^ "Virtualization - Running Intel Binaries in Linux VMs with Rosetta". Apple Developer. Retrieved January 6, 2023.

External links

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