From mboxrd@z Thu Jan 1 00:00:00 1970 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 lists1p.gnu.org (lists1p.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 4F077C88E56 for ; Fri, 11 Sep 2026 12:29:37 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1x50MT-0007bF-11; Fri, 11 Sep 2026 08:28:09 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1x50MR-0007a9-0j for qemu-devel@nongnu.org; Fri, 11 Sep 2026 08:28:07 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1x50MP-00074t-0i for qemu-devel@nongnu.org; Fri, 11 Sep 2026 08:28:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1789129684; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1WUW4ELU4Cz0ipri/RHlLjzyu/yidvhECkZjI5ve4Xw=; b=GDfFKUE29UGchpeIi+jEE1bnSzjCVG4JB7LZibMtgoZhwyDpDhzhoo2WHmkkV/EzpBroHl r0sGgRnfka88k3ZbOp09zXsz5emQBisP21RvNHGRDzZKp3lYKS2XOoh6QtSduGgNSapIOE bSyoB2anTy4RaWMN36gxEe55HT62S6M= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-330-eQUljFxnNrSisc8P4tkB1w-1; Fri, 11 Sep 2026 08:28:00 -0400 X-MC-Unique: eQUljFxnNrSisc8P4tkB1w-1 X-Mimecast-MFC-AGG-ID: eQUljFxnNrSisc8P4tkB1w_1789129677 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id F20E61800758; Fri, 11 Sep 2026 12:27:56 +0000 (UTC) Received: from localhost (headnet05.pony-001.prod.iad2.dc.redhat.com [10.2.32.117]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 892901955D89; Fri, 11 Sep 2026 12:27:55 +0000 (UTC) From: =?utf-8?q?Marc-Andr=C3=A9_Lureau?= Date: Fri, 11 Sep 2026 16:27:29 +0400 Subject: [PATCH 06/10] target/m68k: expose system registers via GDB MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20260911-query-reg-v1-6-0c04f0c02cf3@redhat.com> References: <20260911-query-reg-v1-0-0c04f0c02cf3@redhat.com> In-Reply-To: <20260911-query-reg-v1-0-0c04f0c02cf3@redhat.com> To: qemu-devel@nongnu.org Cc: "Dr. David Alan Gilbert" , =?utf-8?q?Alex_Benn=C3=A9e?= , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Zhao Liu , Peter Maydell , Chinmay Rath , Nicholas Piggin , Glenn Miles , Harsh Prateek Bora , Palmer Dabbelt , Alistair Francis , Weiwei Li , Daniel Henrique Barboza , Liu Zhiwei , Chao Liu , Max Filippov , qemu-arm@nongnu.org, qemu-ppc@nongnu.org, qemu-riscv@nongnu.org, Paolo Bonzini , Laurent Vivier , Mark Cave-Ayland , Artyom Tarasenko , Helge Deller , Pierrick Bouvier , Warner Losh , Kyle Evans , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= X-Developer-Signature: v=1; a=openpgp-sha256; l=4755; i=marcandre.lureau@redhat.com; h=from:subject:message-id; bh=IesXY+sDlfCytswu+bEzF53XDpZvcNCkxXDQFYISFMY=; b=owEBbQKS/ZANAwAKAdro4Ql1lpzlAcsmYgBqo/OvCueRLcYC4C3/RXua2TzP2GSN4UUbuA/it b9X9zRkh3KJAjMEAAEKAB0WIQSHqb2TP4fGBtJ29i3a6OEJdZac5QUCaqPzrwAKCRDa6OEJdZac 5R5AD/wN2EbwgmmoxNas9VMAerI+1XMh6VnDOz9Vke+0c2wqm3tEXUxPm/pVz1aQ541rNUZDZX9 QEw6jHwJ0B3WOyHbZO2+7ZieeIQ5DQpxUmOGDccHBDeW/CTdwyGsdKrb6HpJyJWJJmyGnQEXtbr 8yrOt8aX9gPE7XUe+8a3szCslCCIFlX3fSsNHtaX0ynYeiDUahJIMW3Y7UA832btaenLYiD4X3K K5kMmJHexz/zolp7o9L535BMCAUtrJHYMu6PRKduIyhJj/M8uv2hBDT1Gnpi+1FFB0Zl8PN2y1u h+77HlAyyrQL85yeqdkuWmSxUwYPnHsC1BkUZbdR5c/6xjSIKjonknaKHnpteXr/KEuxk+DMlTh 5NI9A2cfh8yjmApAAKBnH5Zh98Iu0HwLcLh+H7h+TzB4WCoz4kOc2zWh9BkdwFpuy63rf5XlL/H ZUwXOUm6hpsG2/x81Fssr6pjv+vTyVoQeAMIHGkAOXac/LWAZHmgK+HzvmxiuxZ3X9xeS1exAbR vjDRVnEQrOy/WIflV+4HCpRd2itKYy6dRCYU3APpwpL6XNgrKCgviybSJ81pFkY8ehi6JS1QW8b d42z1x4hiNwpIsb49GXnpY6cPx/pGRzVdp6kYrdtyFJ2w0Y9W+VaJE7mMxI5gA6heU301ipn4e1 KkE+0SG4rizXL6Q== X-Developer-Key: i=marcandre.lureau@redhat.com; a=openpgp; fpr=87A9BD933F87C606D276F62DDAE8E10975969CE5 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Received-SPF: pass client-ip=170.10.133.124; envelope-from=marcandre.lureau@redhat.com; helo=us-smtp-delivery-124.mimecast.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, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-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: qemu development 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 an m68k-system.xml GDB feature that exposes supervisor stack pointers (ssp, usp, isp), function code registers (sfc, dfc), MMU registers (urp, srp, dttr0/1, ittr0/1, mmusr) as read-only system registers through the GDB coprocessor interface. Signed-off-by: Marc-André Lureau --- configs/targets/m68k-softmmu.mak | 2 +- gdbstub/gdb-xml/m68k-system.xml | 32 +++++++++++++++++++++++++++ target/m68k/helper.c | 47 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 80 insertions(+), 1 deletion(-) diff --git a/configs/targets/m68k-softmmu.mak b/configs/targets/m68k-softmmu.mak index 0bc889f326e3..f3ac9b74c862 100644 --- a/configs/targets/m68k-softmmu.mak +++ b/configs/targets/m68k-softmmu.mak @@ -1,4 +1,4 @@ TARGET_ARCH=m68k TARGET_BIG_ENDIAN=y -TARGET_XML_FILES= cf-core.xml cf-fp.xml m68k-core.xml m68k-fp.xml +TARGET_XML_FILES= cf-core.xml cf-fp.xml m68k-core.xml m68k-fp.xml m68k-system.xml TARGET_LONG_BITS=32 diff --git a/gdbstub/gdb-xml/m68k-system.xml b/gdbstub/gdb-xml/m68k-system.xml new file mode 100644 index 000000000000..0a91be0edc00 --- /dev/null +++ b/gdbstub/gdb-xml/m68k-system.xml @@ -0,0 +1,32 @@ + + + + + + + + + + + + + + + + + + diff --git a/target/m68k/helper.c b/target/m68k/helper.c index 5f91d206f596..f2615d5bcfb8 100644 --- a/target/m68k/helper.c +++ b/target/m68k/helper.c @@ -123,6 +123,48 @@ static int m68k_fpu_gdb_set_reg(CPUState *cs, uint8_t *mem_buf, int n) return 0; } +#ifndef CONFIG_USER_ONLY +static int m68k_gdb_read_system_register(CPUState *cs, GByteArray *buf, int n) +{ + CPUM68KState *env = cpu_env(cs); + static const int stacks[] = { M68K_SSP, M68K_USP, M68K_ISP }; + + if (n >= 0 && n < ARRAY_SIZE(stacks)) { + int sp = stacks[n]; + + return gdb_get_reg32(buf, env->sp[sp]); + } + switch (n) { + case 3: + return gdb_get_reg32(buf, env->sfc); + case 4: + return gdb_get_reg32(buf, env->dfc); + case 5: + return gdb_get_reg32(buf, env->mmu.urp); + case 6: + return gdb_get_reg32(buf, env->mmu.srp); + case 7: + return gdb_get_reg32(buf, env->mmu.ttr[M68K_DTTR0]); + case 8: + return gdb_get_reg32(buf, env->mmu.ttr[M68K_DTTR1]); + case 9: + return gdb_get_reg32(buf, env->mmu.ttr[M68K_ITTR0]); + case 10: + return gdb_get_reg32(buf, env->mmu.ttr[M68K_ITTR1]); + case 11: + return gdb_get_reg32(buf, env->mmu.mmusr); + default: + return 0; + } +} + +static int m68k_gdb_write_system_register(CPUState *cs, uint8_t *buf, int n) +{ + /* These registers are exposed for inspection only. Ignore writes. */ + return 4; +} +#endif + void m68k_cpu_init_gdb(M68kCPU *cpu) { CPUState *cs = CPU(cpu); @@ -135,6 +177,11 @@ void m68k_cpu_init_gdb(M68kCPU *cpu) gdb_register_coprocessor(cs, m68k_fpu_gdb_get_reg, m68k_fpu_gdb_set_reg, gdb_find_static_feature("m68k-fp.xml")); } +#ifndef CONFIG_USER_ONLY + gdb_register_coprocessor(cs, m68k_gdb_read_system_register, + m68k_gdb_write_system_register, + gdb_find_static_feature("m68k-system.xml")); +#endif /* TODO: Add [E]MAC registers. */ } -- 2.55.0.543.g5ebe2ebe4ea8