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Hermès Bélusca-Maïto 61feb649d1 [NTOS:KD64] kdx86.c: Fix Dr7 check to verify whether debugger disabling is allowed (#7538 ) Don't check the whole Dr7 value, but only the first 8 bits that correspond to the local/global enable breakpoints. We cannot check the whole value because some of the Dr7 bits are reserved always set to 1 (bit 10), or describe other debug state. References: - https://en.wikipedia.org/wiki/X86_debug_register#DR7_-_Debug_control - Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 3 (3A, 3B, 3C, & 3D): System Programming Guide https://www.intel.com/content/www/us/en/developer/articles/technical/intel-sdm.html Section "19.2.4 Debug Control Register (DR7)" (pgs. 644-646)	2024-12-03 19:02:21 +01:00
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kdx86.c

Hermès Bélusca-Maïto 61feb649d1

[NTOS:KD64] kdx86.c: Fix Dr7 check to verify whether debugger disabling is allowed (#7538 )

Don't check the whole Dr7 value, but only the first 8 bits that
correspond to the local/global enable breakpoints.

We cannot check the whole value because some of the Dr7 bits are
reserved always set to 1 (bit 10), or describe other debug state.

References:

- https://en.wikipedia.org/wiki/X86_debug_register#DR7_-_Debug_control

- Intel® 64 and IA-32 Architectures Software Developer’s Manual,
  Volume 3 (3A, 3B, 3C, & 3D): System Programming Guide
  https://www.intel.com/content/www/us/en/developer/articles/technical/intel-sdm.html
  Section "19.2.4 Debug Control Register (DR7)" (pgs. 644-646)

2024-12-03 19:02:21 +01:00

kdx86.c