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[123.253.189.97]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-24c9a46bcf1sm8806555ad.3.2025.09.03.01.14.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Sep 2025 01:14:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1756887286; x=1757492086; 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=YvRVwijnneGWg1Edja7q4SQVpGJeMep01w/gAcM43ZQ=; b=Fs4nHkHpZkJPISI0OlZSYBi6nLoKf/v+FvR0dPrU/756fCFHkJz+SnFLe0KDJ2xHtW MyZow/aFnrGK42jlQSUrwq0n/ZV9R1qy8l/rUvsVIUzkW3gd5EJInCX3uorEosPP0y7w B2Em3fdB01IrWNJ3Y8X5LOWrTIYEyKiVZQhY4ueCPgak9J30WnzBBH46PnREJ5U5ccet AjYE0MM8MqfveAhQsRaoNsOJ8Ae1Dc4veIfReufA/rjtWNDTsZdSNn3jmcbdwNx3RM9m Bdw0y/G/WgKuWWureKJo0Zm3phzRJFWTJESg+O/S//Dw/MKr9o+O2OB+F60B7CJcie1C eRLg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1756887286; x=1757492086; 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=YvRVwijnneGWg1Edja7q4SQVpGJeMep01w/gAcM43ZQ=; b=WF532K4yGrlnQHEPenCLLDokjc853xjFOj0rBLRhU/9hFFuftkJz9uDODRBn0NiC2K JQKMu/ha6WSLbyiTCp1md2ddySLB2R84qtw1ftfTzUoGg9I4HxAyq5aEpYTpLA4Qsaql secNiNSxQ8dnhnRn9R4p/V170WI5q0rKRSgIJi5aYD5ompm45tcHZ+AFO/MHJjy+VC8c VdxE27yp6y82h1GWD/aXzsVzKizRFw89VDOjuzHNAeT9id1bFq9J61gnG4tI7LDxpA8c pbL87oFVW6lsDPx9uzzbesUULPxpT8sntYkLuGwouL5TkGE0c4dH4jt0RJIhxzlzezVn uKIg== X-Forwarded-Encrypted: i=1; AJvYcCVF7E9XD7AbwSVz8lxNBNIHKLJelKKISlHGpx2T4CbH2YWRd6xT1taNfN6sHV/AYI3IRdjr4PP9Ckr4@nongnu.org X-Gm-Message-State: AOJu0YxgN5gzrrbM/rH3kgbM38VhwQnRIAfR4HlWiIZZ8A6eI/N67EAY kLSz8maTPpHctVXSkFwbyHHwmQkhOOewrdOSLD0nido/zakzn7K/EPwrWJ06RA== X-Gm-Gg: ASbGncsEpS9MuwmAbKMukBKwtRy2gEo3gCK99sb8cYrwU4djXUOYADkRLbD0iSIek1w /pRfLmVgeKkvZoVJ4xA9F1X4kKyuSQSYcmrLhTYqLJuho26dIQfxMMNq5HE0jgyheGq3Sgpasx7 8fTJS/1cPMbGAq94ffiiQdXVby2gq3pGdZ4L2oSpkbNxYHPeD9M5k25I5fS/hoFiJysEpa7uhin IIkxZYdJR7dLVxF0VfmhpsSwawfokp9M/o46g1LDfy8BYPGY78xjZYL8Pd8HJSNAX43l00qlFCr z8DeEZ72ZKFQ/FLOXdXsFMMXT0yiK9NeC3NYqFeDs9zY5G4/CWGO03fD2rqc/WzrMDpy+Sk1qc8 L4q4E5vcrs+FfSZ7zmBaYFAtNt7qP+zaNptk8F8cVZgeC7J8OBB465E2bnrp1NU7PW55z X-Google-Smtp-Source: AGHT+IHDKngE7z+ISk9X7AAVoYQatEhKUjexYINGxIGIStv4iu8Z5qCxZ9UMqzrd2WYMFM5W/7Gv3Q== X-Received: by 2002:a17:902:f652:b0:249:3eec:15b8 with SMTP id d9443c01a7336-24944908a47mr194442395ad.24.1756887286150; Wed, 03 Sep 2025 01:14:46 -0700 (PDT) From: Nicholas Piggin To: qemu-riscv@nongnu.org Cc: Nicholas Piggin , Laurent Vivier , Palmer Dabbelt , Alistair Francis , Weiwei Li , Daniel Henrique Barboza , Liu Zhiwei , qemu-devel@nongnu.org Subject: [PATCH v2 3/4] linux-user/riscv: Add vector state to signal context Date: Wed, 3 Sep 2025 18:14:16 +1000 Message-ID: <20250903081417.338515-4-npiggin@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250903081417.338515-1-npiggin@gmail.com> References: <20250903081417.338515-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::62e; envelope-from=npiggin@gmail.com; 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, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1756887324197116600 Content-Type: text/plain; charset="utf-8" This enables vector state to be saved and restored across signals. Signed-off-by: Nicholas Piggin --- linux-user/riscv/signal.c | 132 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 128 insertions(+), 4 deletions(-) diff --git a/linux-user/riscv/signal.c b/linux-user/riscv/signal.c index 4ef55d0848..6af7f6b0f3 100644 --- a/linux-user/riscv/signal.c +++ b/linux-user/riscv/signal.c @@ -41,7 +41,17 @@ struct target_fp_state { uint32_t fcsr; }; =20 +struct target_v_ext_state { + target_ulong vstart; + target_ulong vl; + target_ulong vtype; + target_ulong vcsr; + target_ulong vlenb; + target_ulong datap; +} __attribute__((aligned(16))); + /* The Magic number for signal context frame header. */ +#define RISCV_V_MAGIC 0x53465457 #define END_MAGIC 0x0 =20 /* The size of END signal context header. */ @@ -106,6 +116,90 @@ static abi_ulong get_sigframe(struct target_sigaction = *ka, return sp; } =20 +static unsigned int get_v_state_size(CPURISCVState *env) +{ + RISCVCPU *cpu =3D env_archcpu(env); + + return sizeof(struct target_ctx_hdr) + + sizeof(struct target_v_ext_state) + + cpu->cfg.vlenb * 32; +} + +static struct target_ctx_hdr *save_v_state(CPURISCVState *env, + struct target_ctx_hdr *hdr) +{ + RISCVCPU *cpu =3D env_archcpu(env); + target_ulong vlenb =3D cpu->cfg.vlenb; + uint32_t riscv_v_sc_size =3D get_v_state_size(env); + struct target_v_ext_state *vs; + target_ulong datap; + int i; + + __put_user(RISCV_V_MAGIC, &hdr->magic); + __put_user(riscv_v_sc_size, &hdr->size); + + vs =3D (struct target_v_ext_state *)(hdr + 1); + datap =3D (unsigned long)(vs + 1); + + __put_user(env->vstart, &vs->vstart); + __put_user(env->vl, &vs->vl); + __put_user(env->vtype, &vs->vtype); + target_ulong vcsr =3D riscv_csr_read(env, CSR_VCSR); + __put_user(vcsr, &vs->vcsr); + __put_user(vlenb, &vs->vlenb); + __put_user(datap, &vs->datap); + + for (i =3D 0; i < 32; i++) { + int j; + for (j =3D 0; j < vlenb; j +=3D 8) { + size_t idx =3D (i * vlenb + j); + __put_user(env->vreg[idx / 8], + (uint64_t *)(unsigned long)(datap + idx)); + } + } + + return (void *)hdr + riscv_v_sc_size; +} + +static void restore_v_state(CPURISCVState *env, + struct target_ctx_hdr *hdr) +{ + RISCVCPU *cpu =3D env_archcpu(env); + target_ulong vlenb =3D cpu->cfg.vlenb; + struct target_v_ext_state *vs; + target_ulong datap; + int i; + + uint32_t size; + __get_user(size, &hdr->size); + if (size !=3D get_v_state_size(env)) { + qemu_log_mask(LOG_GUEST_ERROR, "signal: restoring sigcontext vecto= r " + "state with wrong size header (%u)\= n", + size); + return; + } + + vs =3D (struct target_v_ext_state *)(hdr + 1); + + __get_user(env->vstart, &vs->vstart); + __get_user(env->vl, &vs->vl); + __get_user(env->vtype, &vs->vtype); + target_ulong vcsr; + __get_user(vcsr, &vs->vcsr); + riscv_csr_write(env, CSR_VCSR, vcsr); + __get_user(vlenb, &vs->vlenb); + __get_user(datap, &vs->datap); + + for (i =3D 0; i < 32; i++) { + int j; + for (j =3D 0; j < vlenb; j +=3D 8) { + size_t idx =3D (i * vlenb + j); + __get_user(env->vreg[idx / 8], + (uint64_t *)(unsigned long)(datap + idx)); + } + } +} + static void setup_sigcontext(struct target_sigcontext *sc, CPURISCVState *= env) { struct target_ctx_hdr *hdr; @@ -124,7 +218,11 @@ static void setup_sigcontext(struct target_sigcontext = *sc, CPURISCVState *env) __put_user(fcsr, &sc->sc_fpregs.fcsr); =20 __put_user(0, &sc->sc_extdesc.reserved); + hdr =3D &sc->sc_extdesc.hdr; + if (riscv_has_ext(env, RVV)) { + hdr =3D save_v_state(env, hdr); + } __put_user(END_MAGIC, &hdr->magic); __put_user(END_HDR_SIZE, &hdr->size); } @@ -151,8 +249,13 @@ void setup_rt_frame(int sig, struct target_sigaction *= ka, { abi_ulong frame_addr; struct target_rt_sigframe *frame; + size_t frame_size =3D sizeof(*frame); =20 - frame_addr =3D get_sigframe(ka, env, sizeof(*frame)); + if (riscv_has_ext(env, RVV)) { + frame_size +=3D get_v_state_size(env); + } + + frame_addr =3D get_sigframe(ka, env, frame_size); trace_user_setup_rt_frame(env, frame_addr); =20 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { @@ -207,9 +310,30 @@ static void restore_sigcontext(CPURISCVState *env, str= uct target_sigcontext *sc) =20 uint32_t magic; __get_user(magic, &hdr->magic); - if (magic !=3D END_MAGIC) { - qemu_log_mask(LOG_UNIMP, "signal: unknown extended context header:= " - "0x%08x, ignoring", magic); + while (magic !=3D END_MAGIC) { + if (magic =3D=3D RISCV_V_MAGIC) { + if (riscv_has_ext(env, RVV)) { + restore_v_state(env, hdr); + } else { + qemu_log_mask(LOG_GUEST_ERROR, "signal: sigcontext has V s= tate " + "but CPU does not."); + } + } else { + qemu_log_mask(LOG_GUEST_ERROR, "signal: unknown extended state= in " + "sigcontext magic=3D0x%08x", ma= gic); + } + + if (hdr->size =3D=3D 0) { + qemu_log_mask(LOG_GUEST_ERROR, "signal: extended state in " + "sigcontext has size 0"); + } + hdr =3D (void *)hdr + hdr->size; + __get_user(magic, &hdr->magic); + } + + if (hdr->size !=3D END_HDR_SIZE) { + qemu_log_mask(LOG_GUEST_ERROR, "signal: extended state end header = has " + "size=3D%u (should be 0)", hdr->siz= e); } } =20 --=20 2.51.0