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Thu, 19 Nov 2020 16:02:22 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Thu, 19 Nov 2020 17:02:30 +0100 (CET) Date: Thu, 19 Nov 2020 17:02:21 +0100 From: Oleg Nesterov To: Benjamin Herrenschmidt , Madhavan Srinivasan , Michael Ellerman , Paul Mackerras Subject: [PATCH v3 1/2] powerpc/ptrace: simplify gpr_get/tm_cgpr_get Message-ID: <20201119160221.GA5188@redhat.com> References: <20201119160154.GA5183@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201119160154.GA5183@redhat.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 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: , Cc: Christophe Leroy , "Aneesh Kumar K.V" , linux-kernel@vger.kernel.org, Nicholas Piggin , Jan Kratochvil , Al Viro , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" gpr_get() does membuf_write() twice to override pt_regs->msr in between. We can call membuf_write() once and change ->msr in the kernel buffer, this simplifies the code and the next fix. The patch adds a new simple helper, membuf_at(offs), it returns the new membuf which can be safely used after membuf_write(). Signed-off-by: Oleg Nesterov --- arch/powerpc/kernel/ptrace/ptrace-tm.c | 13 +++++-------- arch/powerpc/kernel/ptrace/ptrace-view.c | 13 +++++-------- include/linux/regset.h | 12 ++++++++++++ 3 files changed, 22 insertions(+), 16 deletions(-) diff --git a/arch/powerpc/kernel/ptrace/ptrace-tm.c b/arch/powerpc/kernel/ptrace/ptrace-tm.c index 54f2d076206f..f8fcbd85d4cb 100644 --- a/arch/powerpc/kernel/ptrace/ptrace-tm.c +++ b/arch/powerpc/kernel/ptrace/ptrace-tm.c @@ -86,6 +86,8 @@ int tm_cgpr_active(struct task_struct *target, const struct user_regset *regset) int tm_cgpr_get(struct task_struct *target, const struct user_regset *regset, struct membuf to) { + struct membuf to_msr = membuf_at(&to, offsetof(struct pt_regs, msr)); + if (!cpu_has_feature(CPU_FTR_TM)) return -ENODEV; @@ -97,17 +99,12 @@ int tm_cgpr_get(struct task_struct *target, const struct user_regset *regset, flush_altivec_to_thread(target); membuf_write(&to, &target->thread.ckpt_regs, - offsetof(struct pt_regs, msr)); - membuf_store(&to, get_user_ckpt_msr(target)); + sizeof(struct user_pt_regs)); - BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) != - offsetof(struct pt_regs, msr) + sizeof(long)); + membuf_store(&to_msr, get_user_ckpt_msr(target)); - membuf_write(&to, &target->thread.ckpt_regs.orig_gpr3, - sizeof(struct user_pt_regs) - - offsetof(struct pt_regs, orig_gpr3)); return membuf_zero(&to, ELF_NGREG * sizeof(unsigned long) - - sizeof(struct user_pt_regs)); + sizeof(struct user_pt_regs)); } /* diff --git a/arch/powerpc/kernel/ptrace/ptrace-view.c b/arch/powerpc/kernel/ptrace/ptrace-view.c index 7e6478e7ed07..39686ede40b3 100644 --- a/arch/powerpc/kernel/ptrace/ptrace-view.c +++ b/arch/powerpc/kernel/ptrace/ptrace-view.c @@ -217,6 +217,7 @@ int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data) static int gpr_get(struct task_struct *target, const struct user_regset *regset, struct membuf to) { + struct membuf to_msr = membuf_at(&to, offsetof(struct pt_regs, msr)); int i; if (target->thread.regs == NULL) @@ -228,17 +229,13 @@ static int gpr_get(struct task_struct *target, const struct user_regset *regset, target->thread.regs->gpr[i] = NV_REG_POISON; } - membuf_write(&to, target->thread.regs, offsetof(struct pt_regs, msr)); - membuf_store(&to, get_user_msr(target)); + membuf_write(&to, target->thread.regs, + sizeof(struct user_pt_regs)); - BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) != - offsetof(struct pt_regs, msr) + sizeof(long)); + membuf_store(&to_msr, get_user_msr(target)); - membuf_write(&to, &target->thread.regs->orig_gpr3, - sizeof(struct user_pt_regs) - - offsetof(struct pt_regs, orig_gpr3)); return membuf_zero(&to, ELF_NGREG * sizeof(unsigned long) - - sizeof(struct user_pt_regs)); + sizeof(struct user_pt_regs)); } static int gpr_set(struct task_struct *target, const struct user_regset *regset, diff --git a/include/linux/regset.h b/include/linux/regset.h index c3403f328257..a00765f0e8cf 100644 --- a/include/linux/regset.h +++ b/include/linux/regset.h @@ -46,6 +46,18 @@ static inline int membuf_write(struct membuf *s, const void *v, size_t size) return s->left; } +static inline struct membuf membuf_at(const struct membuf *s, size_t offs) +{ + struct membuf n = *s; + + if (offs > n.left) + offs = n.left; + n.p += offs; + n.left -= offs; + + return n; +} + /* current s->p must be aligned for v; v must be a scalar */ #define membuf_store(s, v) \ ({ \ -- 2.25.1.362.g51ebf55