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* arm64: Move pcb out of kstack into a new UMA zoneJohn Baldwin2026-05-271-4/+2
| | | | | | | | | | | | | | | | | This is similar to commit 5e921ff49ea8bb70506248a4675894729cdad8c2 which moved the pcb for amd64, but a bit different. arm64's pcb is much larger (over 1KB!) than amd64's since it still embeds FP registers. Moving the pcb out of the kstack frees up that much additional kstack space. Unlike amd64 however, embedding the pcb in struct mdthread is not practical as the resulting struct thread would grow such that UMA would now store 1 thread per 4k page instead of 2 threads per page. By using a separate UMA zone for pcbs, 2 struct threads can continue to fit in a single 4k page, and 3 pcbs can fit in another 4k page. Reviewed by: kib, jrtc27, andrew Sponsored by: AFRL, DARPA Pull Request: https://ron-dev.freebsd.org/FreeBSD/src/pulls/23
* sys: Consistently use ptoa() with td_kstack_pagesJohn Baldwin2026-05-271-1/+1
| | | | | | | Suggested by: kib Reviewed by: kib, andrew (arm changes) Sponsored by: AFRL, DARPA Pull Request: https://ron-dev.freebsd.org/FreeBSD/src/pulls/23
* sys: Add td_kstack_top inline helper functionJohn Baldwin2026-05-271-2/+1
| | | | | | | | This function returns a pointer to the top of the kstack. Reviewed by: kib, andrew (arm changes) Sponsored by: AFRL, DARPA Pull Request: https://ron-dev.freebsd.org/FreeBSD/src/pulls/23
* sys: Switch td_kstack from vm_offset_t to char *John Baldwin2026-04-231-4/+4
| | | | | | | Effort: CHERI upstreaming Reviewed by: kib Sponsored by: AFRL, DARPA Pull Request: https://github.com/freebsd/freebsd-src/pull/2068
* sys: Remove $FreeBSD$: two-line .h patternWarner Losh2023-08-161-2/+0
| | | | Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/
* kstack_contains(): account for struct pcb on stackKonstantin Belousov2023-02-011-1/+2
| | | | | | | | | for arm64, arm, powerpc, and riscv Reviewed by: jhb Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D38320
* Move kstack_contains() and GET_STACK_USAGE() to MD machine/stack.hKonstantin Belousov2023-02-011-0/+18
| | | | | | | Reviewed by: jhb Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D38320
* arm64: Improve DDB backtrace supportJessica Clarke2021-02-011-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | The existing implementation relies on each trap handler saving a normal stack frame record, which is a waste of time and space when we're already saving a trapframe to the stack. It's also wrong as it currently saves LR not ELR. Instead of patching it up, rewrite it based on the RISC-V implementation with inspiration from the amd64 implementation for how to handle vectored traps to provide an improved implementation. This includes compressing the information down to one line like other architectures rather than the highly-verbose old form that repeats itself by printing LR and FP in one frame only to print them as PC and SP in the next. It also includes printing out actually useful information about the traps that occurred, though FAR is not saved in the trapframe so we cannot print it (in general it can be clobbered between when the trap happened and now), only ESR. The AAPCS also allows the stack frame record to be located anywhere in the frame, not just the top, so the caller's SP is not at a fixed offset from the callee's FP like on almost all other architectures in existence. This means there is no way to derive the caller's SP in the unwinder, and so we have to drop that bit of (unused) state everywhere. Reviewed by: jhb, markj Differential Revision: https://reviews.freebsd.org/D28026
* Check that the frame pointer is within the current stack.John Baldwin2020-12-081-1/+1
| | | | | | | | | | | | | | This same check is used on other architectures. Previously this would permit a stack frame to unwind into any arbitrary kernel address (including unmapped addresses). Reviewed by: andrew, markj Obtained from: CheriBSD Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D27362 Notes: svn path=/head/; revision=368455
* Use uintptr_t instead of uint64_t for pointers in stack frames.John Baldwin2020-12-011-3/+3
| | | | | | | | | | Reviewed by: andrew Obtained from: CheriBSD Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D27361 Notes: svn path=/head/; revision=368245
* Split out db_unwind_frame() so it can be used by DTrace.Ruslan Bukin2015-06-111-0/+8
| | | | | | | | Sponsored by: ARM Ltd. Differential Revision: https://reviews.freebsd.org/D2741 Notes: svn path=/head/; revision=284257
* Bring in the start of the arm64 kernel.Andrew Turner2015-04-131-0/+35
This is only the minimum set of files needed to boot in qemu. As such it is missing a few things. The bus_dma code is currently only stub functions with a full implementation from the development tree to follow. The gic driver has been copied as the interrupt framework is different. It is expected the two drivers will be merged by the arm intrng project, however this will need to be imported into the tree and support for arm64 would need to be added. This includes code developed by myself, SemiHalf, Ed Maste, and Robin Randhawa from ARM. This has been funded by the FreeBSD Foundation, with early development by myself in my spare time with assistance from Robin. Differential Revision: https://reviews.freebsd.org/D2199 Reviewed by: emaste, imp Relnotes: yes Sponsored by: The FreeBSD Foundation Notes: svn path=/head/; revision=281494
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