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aras-p/set_gs_darwin.s

Last active May 26, 2023 04:28
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How to set %gs base on Darwin
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set_gs_darwin.s
# _seems_ to make %gs base point to address in %rdi
# on x86-64 Darwin
#
# (what would be amd64_set_gsbase on FreeBSD, or
# arch_prctl with ARCH_SET_GS on Linux)
#
# Could find exacty zero documentation on this!
movl $0x3000003, %eax;
syscall;
@ultimaweapon
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Do you know is it possible to set %fs from user-space application?

@aras-p
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aras-p commented May 26, 2023

No idea!

@ultimaweapon
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Thank you for your quick response!

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