git: d4f495fbf88f - main - i386: Add static asssert for context size

The branch main has been updated by imp:

URL: https://cgit.FreeBSD.org/src/commit/?id=d4f495fbf88fbc0391b221ce2315a820ad31236d

commit d4f495fbf88fbc0391b221ce2315a820ad31236d
Author:     Warner Losh <imp@FreeBSD.org>
AuthorDate: 2022-02-10 21:26:53 +0000
Commit:     Warner Losh <imp@FreeBSD.org>
CommitDate: 2022-02-10 21:32:20 +0000

    i386: Add static asssert for context size
    
    Add a static assert for the siginfo_t, mcontext_t and ucontext_t
    sizes. These are de-facto ABI options and cannot change size ever.
    
    Reviewed by:            kib
    Differential Revision:  https://reviews.freebsd.org/D34211
---
 sys/i386/i386/exec_machdep.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/i386/i386/exec_machdep.c b/sys/i386/i386/exec_machdep.c
index 01602e43733f..0463615d96d9 100644
--- a/sys/i386/i386/exec_machdep.c
+++ b/sys/i386/i386/exec_machdep.c
@@ -115,6 +115,10 @@ static void freebsd4_sendsig(sig_t catcher, ksiginfo_t *, sigset_t *mask);
 
 extern struct sysentvec elf32_freebsd_sysvec;
 
+_Static_assert(sizeof(mcontext_t) == 640, "mcontext_t size incorrect");
+_Static_assert(sizeof(ucontext_t) == 704, "ucontext_t size incorrect");
+_Static_assert(sizeof(siginfo_t) == 64, "siginfo_t size incorrect");
+
 /*
  * Send an interrupt to process.
  *