public inbox for glibc-cvs@sourceware.org help / color / mirror / Atom feed
From: Florian Weimer <fw@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/fw/glibc-hwcaps] elf: Enhance ld.so --help to print HWCAP subdirectories Date: Thu, 1 Oct 2020 16:54:21 +0000 (GMT) [thread overview] Message-ID: <20201001165421.92DE93985476@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b124245ba3070588a8b0d88b915ff9456b27a2d4 commit b124245ba3070588a8b0d88b915ff9456b27a2d4 Author: Florian Weimer <fweimer@redhat.com> Date: Tue Jun 9 16:17:12 2020 +0200 elf: Enhance ld.so --help to print HWCAP subdirectories Diff: --- elf/dl-usage.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) diff --git a/elf/dl-usage.c b/elf/dl-usage.c index 20aa715cb1..9765d1b5c1 100644 --- a/elf/dl-usage.c +++ b/elf/dl-usage.c @@ -22,6 +22,8 @@ #include <unistd.h> #include "version.h" +#include <dl-hwcaps.h> + void _dl_usage (const char *argv0, const char *wrong_option) { @@ -101,6 +103,65 @@ print_search_path_for_help (struct dl_main_state *state) print_search_path_for_help_1 (__rtld_search_dirs.dirs); } +/* Helper function for printing flags associated with a HWCAP name. */ +static void +print_hwcap_1 (bool *first, bool active, const char *label) +{ + if (active) + { + if (*first) + { + _dl_printf (" ("); + *first = false; + } + else + _dl_printf (", "); + _dl_printf ("%s", label); + } +} + +/* Called after a series of print_hwcap_1 calls to emit the line + terminator. */ +static void +print_hwcap_1_finish (bool *first) +{ + if (*first) + _dl_printf ("\n"); + else + _dl_printf (")\n"); +} + +/* Write a list of hwcap subdirectories to standard output. See + _dl_important_hwcaps in dl-hwcaps.c. */ +static void +print_legacy_hwcap_directories (void) +{ + _dl_printf ("\n\ +Legacy HWCAP subdirectories under library search path directories:\n"); + + const char *platform = GLRO (dl_platform); + if (platform != NULL) + _dl_printf (" %s (AT_PLATFORM)\n", platform); + + _dl_printf (" tls (supported, searched)\n"); + + uint64_t hwcap_mask = GET_HWCAP_MASK(); + uint64_t searched = GLRO (dl_hwcap) & hwcap_mask; + for (int n = 63; n >= 0; --n) + { + uint64_t bit = 1ULL << n; + if (HWCAP_IMPORTANT & bit) + { + _dl_printf (" %s", _dl_hwcap_string (n)); + bool first = true; + print_hwcap_1 (&first, GLRO (dl_hwcap) & bit, "supported"); + print_hwcap_1 (&first, !(hwcap_mask & bit), "masked"); + print_hwcap_1 (&first, searched & bit, "searched"); + print_hwcap_1_finish (&first); + } + } +} + void _dl_help (const char *argv0, struct dl_main_state *state) { @@ -136,5 +197,6 @@ This program interpreter self-identifies as: " RTLD "\n\ ", argv0); print_search_path_for_help (state); + print_legacy_hwcap_directories (); _exit (0); }
reply other threads:[~2020-10-01 16:54 UTC|newest] Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20201001165421.92DE93985476@sourceware.org \ --to=fw@sourceware.org \ --cc=glibc-cvs@sourceware.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).