[Bug 262709] -pg profiling not available on arm64 [fails with undefined symbol: .mcount]

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 23 Mar 2022 15:32:02 UTC

--- Comment #7 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:


commit 16d5f9a1649e6a3e5841c6c41d6af9430ed9f064
Author:     Andrew Turner <andrew@FreeBSD.org>
AuthorDate: 2022-03-22 15:46:15 +0000
Commit:     Andrew Turner <andrew@FreeBSD.org>
CommitDate: 2022-03-23 15:16:59 +0000

    Add an implementation of .mcount on arm64

    To support cc -pg on arm64 we need to implement .mcount. As clang and
    gcc think it is function like it just needs to load the arguments
    to _mcount and call it.

    On gcc the first argument is passed in x0, however this is missing on
    clang so we need to load it from the stack. As it's the caller return
    address this will be at a known location.

    PR:             262709
    Reviewed by:    emaste (earlier version)
    Sponsored by:   The FreeBSD Foundation
    Differential Revision: https://reviews.freebsd.org/D34634

 lib/libc/aarch64/Symbol.map |  1 +
 sys/arm64/include/profile.h | 45 ++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 45 insertions(+), 1 deletion(-)

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