A mirror of https://github.com/libressl/openbsd.git https://git.lua4.win/openbsd/atom?h=tb_20210818 2021-08-18T16:06:57+00:00 2021-08-18T16:06:57+00:00 cvs2svn admin@example.com 2021-08-18T16:06:57+00:00 urn:sha1:d56c8fa8260d226f98b26f017b45b9c2b135f38d 2020-07-06T13:33:06+00:00 pirofti 2020-07-06T13:33:06+00:00 urn:sha1:0320e8b397405d62725b086d54c65caf0669f919 This diff exposes parts of clock_gettime(2) and gettimeofday(2) to userland via libc eliberating processes from the need for a context switch everytime they want to count the passage of time. If a timecounter clock can be exposed to userland than it needs to set its tc_user member to a non-zero value. Tested with one or multiple counters per architecture. The timing data is shared through a pointer found in the new ELF auxiliary vector AUX_openbsd_timekeep containing timehands information that is frequently updated by the kernel. Timing differences between the last kernel update and the current time are adjusted in userland by the tc_get_timecount() function inside the MD usertc.c file. This permits a much more responsive environment, quite visible in browsers, office programs and gaming (apparently one is are able to fly in Minecraft now). Tested by robert@, sthen@, naddy@, kmos@, phessler@, and many others! OK from at least kettenis@, cheloha@, naddy@, sthen@ 2019-09-29T16:30:35+00:00 jmc 2019-09-29T16:30:35+00:00 urn:sha1:636626a8886eb9c68c9ab9328b4270ba95482eeb 2019-09-28T15:00:44+00:00 deraadt 2019-09-28T15:00:44+00:00 urn:sha1:5f24aac68172fe082be82e041834d6d8f2ff3592 2019-07-29T23:14:06+00:00 deraadt 2019-07-29T23:14:06+00:00 urn:sha1:4da1936865acf10342b9a0523ce755f5bf2e266c 2019-03-24T17:56:54+00:00 deraadt 2019-03-24T17:56:54+00:00 urn:sha1:8ca8dfb7d8fb508ace2f84a8985558f5bd56cf97 allocate pages, don't call abort() because of corefile data leakage concerns, but simply _exit(). The reasoning is _rs_init() will only fail if someone finds a way to apply specific pressure against this failure point, for the purpose of leaking information into a core which they can read. We don't need a corefile in this instance to debug that. So take this "lever" away from whoever in the future wants to do that. 2019-01-20T02:59:07+00:00 bcook 2019-01-20T02:59:07+00:00 urn:sha1:f93645fdb8c9e391f6fc6050e68517b1bf8e5898 ok deraadt@ tedu@ 2017-07-22T06:39:54+00:00 jmc 2017-07-22T06:39:54+00:00 urn:sha1:5e58b3060bd73ed52ab502ae83d6be1890027165 2017-07-22T03:23:48+00:00 tedu 2017-07-22T03:23:48+00:00 urn:sha1:8b932777a6fc29aca41ab2e1e0d6eb0717a72a6f 2016-08-26T08:25:02+00:00 guenther 2016-08-26T08:25:02+00:00 urn:sha1:ea152cc7a0da6c58c7e582039cdd13fa86397bbc ok deraadt@