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95ee2897 |
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16-Aug-2023 |
Warner Losh <imp@FreeBSD.org> |
sys: Remove $FreeBSD$: two-line .h pattern Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/
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eeada922 |
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01-Jul-2020 |
Andrew Turner <andrew@FreeBSD.org> |
Move ID reading signatures to a better header The functions to read the common user and kernel ID registers should be in cpu.h rather than undefined.h as they are related to CPU details and used by undefined instruction handlers. Sponsored by: Innovate UK
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45e999d9 |
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29-Jun-2020 |
Andrew Turner <andrew@FreeBSD.org> |
Create a kernel arm64 ID register view In preparation for using ifuncs in the kernel is is useful to have a common view of the arm64 ID registers across all CPUs. Add this and extract the logic for finding the lower value of two fields to a new helper function. Sponsored by: Innovate UK Differential Revision: https://reviews.freebsd.org/D25463
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e68508e1 |
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30-Oct-2019 |
Andrew Turner <andrew@FreeBSD.org> |
Allow the userspace ID register fields to be read from the kernel To allow consistent values to be used in both the kernel and userspace create a function for these to be read from the kernel. They use a newly created macro with the name of the ID register to read. For now there is redundant information in the user_regs array as it still holds the CRm and Op2 values, however this will be fixed in a later change. This will be used by ptrace to allow hardware breakpoints in userspace. Sponsored by: DARPA, AFRL
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cb5343c2 |
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29-Oct-2019 |
Andrew Turner <andrew@FreeBSD.org> |
Move the MRS instruction decode macros to armreg.h These instructions are used to access the registers described in armreg.h, and will be used in a future change to create a per-register identification macro. Sponsored by: DARPA, AFRL
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c7637c4d |
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27-Sep-2018 |
Andrew Turner <andrew@FreeBSD.org> |
Move the undefined instruction handler to identcpu.c so we have access to the registers from boot. Approved by: re (kib) Sponsored by: ABT Systems Ltd Differential Revision: https://reviews.freebsd.org/D17301
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bcf2b954 |
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14-Sep-2017 |
Andrew Turner <andrew@FreeBSD.org> |
Add support for handling undefined instructions in userspace and the kernel. We can register callbacks to perform the required operation on the saved registers before returning. This is initially used to work around a bug in old versions of QEMU that trigger such an exception when reading from an ID register when it should load z zero value. I expect this could be used with other exception types, e.g. to emulate special register access from userland. Sponsored by: DARPA, AFRL
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