From patchwork Tue Jul 2 23:41:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Henderson X-Patchwork-Id: 13720478 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6E8C4C30658 for ; Tue, 2 Jul 2024 23:43:04 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sOn8g-0007q0-0N; Tue, 02 Jul 2024 19:42:23 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sOn8V-0007mc-Rp for qemu-devel@nongnu.org; Tue, 02 Jul 2024 19:42:13 -0400 Received: from mail-pl1-x62e.google.com ([2607:f8b0:4864:20::62e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1sOn8L-0006N1-8d for qemu-devel@nongnu.org; Tue, 02 Jul 2024 19:42:11 -0400 Received: by mail-pl1-x62e.google.com with SMTP id d9443c01a7336-1f6a837e9a3so20790785ad.1 for ; Tue, 02 Jul 2024 16:42:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1719963719; x=1720568519; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=GwtkDEQSe1rF7ol2hwOawpAhY63WerL1vNoE65OHhNw=; b=ysXTxB4bkgw0sR27syT0Hz/gco+NJBS3zOKv0hTKunkISc6Qqa7PLnrq8eG8TDJfY+ dYekmK0/u7GTpif7C1tIVRIC931mZ/8i/idZDPYDDZ06ox46+FE81hyjzsII79yeyXLw Z25lKm6Py1BHWyVRYwzYldXODh+rstujVWyYIBMggwgnKeLdzJK+EKfWCMNZYa4O39fT MNVfUgwCWdariqVwmhYugDZgfNPKi2g87joqnOi7L16OY5MNChx1ly+V+8trvoyeoieR 4Se3lmdNpm51wNpP9SbyQSZvtiOr+ZLbuQ+5tf1G1zu2PKgNFPg+7WFbgiufAK+uTZlG miLA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1719963719; x=1720568519; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=GwtkDEQSe1rF7ol2hwOawpAhY63WerL1vNoE65OHhNw=; b=KbZrGMjGGxStiRsssNJ3N0jldFDrpiZpEH8X6n21E0AhvYwGbbgbeaJysLoPEkvtFG tKaR1RhTzHylBTyxGWtxeGV5jirN0wz7hib10x6rtIXL2LFGcCOBhU8axoWun9OeH/m7 6MIJf1yqVOr5CWeIAGhOYuouM5BXWaNDxBGC/OUODiti/TGCIkQWP9iShd6N1VIakfJ8 UjZVhZhjl4A7NXLgX0W6MB2dnq7AQ7JnKgLZsaZZJA/YPPyAa0VImiblrBv1wEYXwzsA Z2JLKNZCwDtLp0rEJ79amXIKol6YRqjQL2lCwb0zpfDhfyj812pP2J8DecOgL1cfk9DX iq1Q== X-Gm-Message-State: AOJu0YwoOQ8j0FPTVAVGvlVA5nuS2+p2D2hzNIvGc0MOt3aFVekP8ppE l326OXc7AmP+TmYviqT13DXfYuC5h0JLzoKFVwnHK9V7v4ZCUbYrZBOlzNFTquGfrDVxlpv0gvq 4 X-Google-Smtp-Source: AGHT+IHOYRSUiaHVo/dZPtbFSp3GKRAwXQYonDt1x2/3DGColNSHvgpGjcmugaZfvgZw3ES0YOvZmg== X-Received: by 2002:a17:902:e54f:b0:1f7:1655:825c with SMTP id d9443c01a7336-1fadbca1794mr82220985ad.36.1719963718703; Tue, 02 Jul 2024 16:41:58 -0700 (PDT) Received: from stoup.. (174-21-76-141.tukw.qwest.net. [174.21.76.141]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1fac15993c5sm90403755ad.244.2024.07.02.16.41.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Jul 2024 16:41:58 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, qemu-ppc@nongnu.org, iii@linux.ibm.com, david@redhat.com, balaton@eik.bme.hu Subject: [PATCH 1/2] accel/tcg: Introduce memset_ra, memmove_ra Date: Tue, 2 Jul 2024 16:41:54 -0700 Message-Id: <20240702234155.2106399-2-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240702234155.2106399-1-richard.henderson@linaro.org> References: <20240702234155.2106399-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::62e; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x62e.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Add wrappers that set and clear helper_retaddr around the host memory operation. This cannot fail for system mode, but might raise SIGSEGV for user mode. Signed-off-by: Richard Henderson Reviewed-by: Peter Maydell --- include/exec/cpu_ldst.h | 40 ++++++++++++++++++++++++++++++++++++++++ accel/tcg/user-exec.c | 22 ++++++++++++++++++++++ 2 files changed, 62 insertions(+) diff --git a/include/exec/cpu_ldst.h b/include/exec/cpu_ldst.h index 71009f84f5..baf4f9367d 100644 --- a/include/exec/cpu_ldst.h +++ b/include/exec/cpu_ldst.h @@ -379,4 +379,44 @@ void *tlb_vaddr_to_host(CPUArchState *env, abi_ptr addr, MMUAccessType access_type, int mmu_idx); #endif +/** + * memset_ra: + * @p: host pointer + * @c: data + * @n: length + * @ra: unwind return address + * + * Like system memset(p,c,n), except manages @ra for the calling + * helper in the event of a signal. To be used with the result + * of tlb_vaddr_to_host to resolve the host pointer. + */ +#ifdef CONFIG_USER_ONLY +void *memset_ra(void *p, int c, size_t n, uintptr_t ra); +#else +static inline void *memset_ra(void *p, int c, size_t n, uintptr_t ra) +{ + return memset(p, c, n); +} +#endif + +/** + * memmove_ra: + * @d: host destination pointer + * @s: host source pointer + * @n: length + * @ra: unwind return address + * + * Like system memmove(d,s,n), except manages @ra for the calling + * helper in the event of a signal. To be used with the result of + * tlb_vaddr_to_host to resolve the host pointer. + */ +#ifdef CONFIG_USER_ONLY +void *memmove_ra(void *d, const void *s, size_t n, uintptr_t ra); +#else +static inline void *memmove_ra(void *d, const void *s, size_t n, uintptr_t ra) +{ + return memmove(d, s, n); +} +#endif + #endif /* CPU_LDST_H */ diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c index 80d24540ed..a73da42e3a 100644 --- a/accel/tcg/user-exec.c +++ b/accel/tcg/user-exec.c @@ -1289,3 +1289,25 @@ static void *atomic_mmu_lookup(CPUState *cpu, vaddr addr, MemOpIdx oi, #define DATA_SIZE 16 #include "atomic_template.h" #endif + +void *memset_ra(void *p, int c, size_t n, uintptr_t ra) +{ + void *r; + + set_helper_retaddr(ra); + r = memset(p, c, n); + clear_helper_retaddr(); + + return r; +} + +void *memmove_ra(void *d, const void *s, size_t n, uintptr_t ra) +{ + void *r; + + set_helper_retaddr(ra); + r = memmove(d, s, n); + clear_helper_retaddr(); + + return r; +}