[PATCH] bsd-user/x86_64/target_arch_thread.h: Align stack

[Ilya Leoshkevich <iii@linux.ibm.com>]

bsd-user qemu-x86_64 almost immediately dies with:

    qemu: 0x4002201a68: unhandled CPU exception 0xd - aborting

on FreeBSD 14.1-RELEASE. This is an instruction that requires
alignment:

    (gdb) x/i 0x4002201a68
       0x4002201a68:        movaps %xmm0,-0x40(%rbp)

and the argument is not aligned:

    (gdb) p/x env->regs[5]
    $1 = 0x822443b58

A quick experiment shows that the userspace entry point expects
misaligned rsp:

    (gdb) starti
    (gdb) p/x $rsp
    $1 = 0x7fffffffeaa8

Emulate this behavior in bsd-user.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 bsd-user/x86_64/target_arch_thread.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bsd-user/x86_64/target_arch_thread.h b/bsd-user/x86_64/target_arch_thread.h
index 52c28906d6d..25233443c14 100644
--- a/bsd-user/x86_64/target_arch_thread.h
+++ b/bsd-user/x86_64/target_arch_thread.h
@@ -31,7 +31,7 @@ static inline void target_thread_init(struct target_pt_regs *regs,
     struct image_info *infop)
 {
     regs->rax = 0;
-    regs->rsp = infop->start_stack;
+    regs->rsp = (infop->start_stack & ~0xfUL) - 8;
     regs->rip = infop->entry;
     regs->rdi = infop->start_stack;
 }
-- 
2.45.2