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Add support for GENTER and GEXIT in AArch64 on Apple platforms #5933

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jonpalmisc opened this issue Sep 14, 2024 · 0 comments
Open

Add support for GENTER and GEXIT in AArch64 on Apple platforms #5933

jonpalmisc opened this issue Sep 14, 2024 · 0 comments
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Arch: ARM64 Issues with the AArch64 architecture plugin Component: Architecture Issue needs changes to an architecture plugin Effort: Trivial Issue should take < 1 day Impact: Medium Issue is impactful with a bad, or no, workaround

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@jonpalmisc
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The GXF feature on newer Apple SoCs uses two custom instructions, GENTER and GEXIT. These appear in the iOS kernelcache and SPTM on newer devices.

Their opcodes are:

  • 20 14 20 00: GENTER
  • 00 14 20 00: GEXIT

These instructions are not supported by Binary Ninja, and are disassembled as undefined instructions. This is problematic on its own, but also acts as a barrier to disassembling the rest of a function, making it's impact more annoying than just being an undefined instruction.
@jonpalmisc jonpalmisc changed the title Add support for GENTER and GEXIT in AArch64 Add support for GENTER and GEXIT in AArch64 on Apple platforms Sep 14, 2024
@emesare emesare added Component: Architecture Issue needs changes to an architecture plugin Arch: ARM64 Issues with the AArch64 architecture plugin Impact: Medium Issue is impactful with a bad, or no, workaround Effort: Trivial Issue should take < 1 day labels Sep 15, 2024
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Arch: ARM64 Issues with the AArch64 architecture plugin Component: Architecture Issue needs changes to an architecture plugin Effort: Trivial Issue should take < 1 day Impact: Medium Issue is impactful with a bad, or no, workaround
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@emesare @jonpalmisc