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Mon, 04 Nov 2024 19:43:21 -0800 (PST) Received: from dune.bsdimp.com ([50.253.99.174]) by smtp.gmail.com with ESMTPSA id e9e14a558f8ab-3a6bddcdcd8sm17162665ab.37.2024.11.04.19.43.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 Nov 2024 19:43:20 -0800 (PST) From: Warner Losh To: qemu-devel@nongnu.org Cc: Warner Losh , Jessica Clarke , Kyle Evans , Ilya Leoshkevich , Richard Henderson Subject: [PULL 1/3] bsd-user/x86_64/target_arch_thread.h: Align stack Date: Mon, 4 Nov 2024 20:40:37 -0700 Message-ID: <20241105034039.31143-2-imp@bsdimp.com> X-Mailer: git-send-email 2.46.1 In-Reply-To: <20241105034039.31143-1-imp@bsdimp.com> References: <20241105034039.31143-1-imp@bsdimp.com> MIME-Version: 1.0 Received-SPF: none client-ip=2607:f8b0:4864:20::136; envelope-from=imp@bsdimp.com; helo=mail-il1-x136.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Ilya Leoshkevich 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. [[ applied Richard's suggestion ]] Signed-off-by: Ilya Leoshkevich Reviewed-by: Richard Henderson Reviewed-by: Warner Losh Signed-off-by: Warner Losh --- 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..7739bb2154b 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 - 8) & ~0xfUL) + 8; regs->rip = infop->entry; regs->rdi = infop->start_stack; }