From: Paul Floyd <pjfloyd@wanadoo.fr>
Date: Sun, 28 Sep 2025 02:11:58 +0000 (+0000)
Subject: FreeBSD vgdb: ensure stack is 16byte aligned for invoker
X-Git-Tag: VALGRIND_3_26_0~51
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c6092d4230fd2533374555213632e77b95a33a5d;p=thirdparty%2Fvalgrind.git

FreeBSD vgdb: ensure stack is 16byte aligned for invoker

I haven't seen any issues but there's no harm in being certain.
---

diff --git a/coregrind/vgdb-invoker-freebsd.c b/coregrind/vgdb-invoker-freebsd.c
index 607e05991..4a89fb37d 100644
--- a/coregrind/vgdb-invoker-freebsd.c
+++ b/coregrind/vgdb-invoker-freebsd.c
@@ -561,6 +561,7 @@ Bool invoker_invoke_gdbserver (pid_t pid)
       reg_mod.r_rip = shared64->invoke_gdbserver;
 #elif defined(VGA_arm64)
       reg_mod.x[0] = check;
+      sp &= ~0xf; // keep the stack aligned on 16 bytes ...
       reg_mod.sp = sp;
       reg_mod.elr = shared64->invoke_gdbserver;
       /* put NULL return address in Link Register */