5 commits

Author	SHA1	Message	Date
Mitchell Horne	6ae48dd870	Fix global pointer relaxations in the RISC-V kernel ... The gp register is intended to used by the linker as another means of performing relaxations, and should point to the small data section (.sdata). Currently gp is being used as the pcpu pointer within the kernel, but the more appropriate choice for this is the tp register, which is unused. Swap existing usage of gp with tp within the kernel, and set up gp properly at boot with the value of __global_pointer$ for all harts. Additionally, remove some cases of accessing tp from the PCB, as it is not part of the per-thread state. The user's tp and gp should be tracked only through the trapframe. Reviewed by: markj, jhb Approved by: markj (mentor) MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D19893	2019-06-09 15:43:38 +00:00
Ruslan Bukin	157654d0c4	Permit supervisor to access user VA space for certain functions only. ... This is done by setting SUM (permit Supervisor User Memory access) bit in sstatus register. The functions we allow access for are routines in assembly that explicitly handle crossing the user kernel boundary. Approved by: re (kib) Sponsored by: DARPA, AFRL	2018-09-05 11:34:58 +00:00
Ruslan Bukin	2ad1d09f16	o Add support for long double. ... o Add support for latest RISC-V GNU toolchain. Sponsored by: DARPA, AFRL Sponsored by: HEIF5	2016-11-03 13:06:17 +00:00
Ruslan Bukin	e3ee7f49f1	Access pcpup using gp register.	2016-02-04 14:30:46 +00:00
Ruslan Bukin	8d7e7a98db	Import RISC-V machine headers. This is a minimal set required to compile ... kernel and userland. Reviewed by: andrew, imp, kib Sponsored by: DARPA, AFRL Sponsored by: HEIF5 Differential Revision: https://reviews.freebsd.org/D4554	2015-12-17 18:44:30 +00:00