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Riedl" To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v5 02/10] powerpc/signal: Add unsafe_copy_{vsx, fpr}_from_user() Date: Wed, 3 Feb 2021 12:43:15 -0600 Message-Id: <20210203184323.20792-3-cmr@codefail.de> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20210203184323.20792-1-cmr@codefail.de> References: <20210203184323.20792-1-cmr@codefail.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Virus-Scanned: ClamAV using ClamSMTP X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Reuse the "safe" implementation from signal.c except for calling unsafe_copy_from_user() to copy into a local buffer. Signed-off-by: Christopher M. Riedl --- arch/powerpc/kernel/signal.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/arch/powerpc/kernel/signal.h b/arch/powerpc/kernel/signal.h index 2559a681536e..7dfc536c78ef 100644 --- a/arch/powerpc/kernel/signal.h +++ b/arch/powerpc/kernel/signal.h @@ -53,6 +53,30 @@ unsigned long copy_ckfpr_from_user(struct task_struct *task, void __user *from); &buf[i], label);\ } while (0) +#define unsafe_copy_fpr_from_user(task, from, label) do { \ + struct task_struct *__t = task; \ + u64 __user *__f = (u64 __user *)from; \ + u64 buf[ELF_NFPREG]; \ + int i; \ + \ + unsafe_copy_from_user(buf, __f, sizeof(buf), label); \ + for (i = 0; i < ELF_NFPREG - 1; i++) \ + __t->thread.TS_FPR(i) = buf[i]; \ + __t->thread.fp_state.fpscr = buf[i]; \ +} while (0) + +#define unsafe_copy_vsx_from_user(task, from, label) do { \ + struct task_struct *__t = task; \ + u64 __user *__f = (u64 __user *)from; \ + u64 buf[ELF_NVSRHALFREG]; \ + int i; \ + \ + unsafe_copy_from_user(buf, __f, sizeof(buf), label); \ + for (i = 0; i < ELF_NVSRHALFREG ; i++) \ + __t->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i]; \ +} while (0) + + #ifdef CONFIG_PPC_TRANSACTIONAL_MEM #define unsafe_copy_ckfpr_to_user(to, task, label) do { \ struct task_struct *__t = task; \ @@ -80,6 +104,10 @@ unsigned long copy_ckfpr_from_user(struct task_struct *task, void __user *from); unsafe_copy_to_user(to, (task)->thread.fp_state.fpr, \ ELF_NFPREG * sizeof(double), label) +#define unsafe_copy_fpr_from_user(task, from, label) \ + unsafe_copy_from_user((task)->thread.fp_state.fpr, from, \ + ELF_NFPREG * sizeof(double), label) + static inline unsigned long copy_fpr_to_user(void __user *to, struct task_struct *task) { @@ -115,6 +143,8 @@ copy_ckfpr_from_user(struct task_struct *task, void __user *from) #else #define unsafe_copy_fpr_to_user(to, task, label) do { } while (0) +#define unsafe_copy_fpr_from_user(task, from, label) do { } while (0) + static inline unsigned long copy_fpr_to_user(void __user *to, struct task_struct *task) { -- 2.26.1