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From: Greentime Hu <greentime.hu@sifive.com>
To: greentime.hu@sifive.com, guoren@linux.alibaba.com,
	vincent.chen@sifive.com, paul.walmsley@sifive.com,
	palmerdabbelt@google.com, linux-riscv@lists.infradead.org,
	linux-kernel@vger.kernel.org, oleg@redhat.com
Subject: [RFC PATCH v4 01/13] ptrace: Use regset_size() for dynamic regset size.
Date: Tue, 26 May 2020 15:02:30 +0800	[thread overview]
Message-ID: <3700190a602a6d30fcbf76e1eea667e29a65c4c9.1590474856.git.greentime.hu@sifive.com> (raw)
In-Reply-To: <cover.1590474856.git.greentime.hu@sifive.com>

It uses regset_size() instead of using regset->n and regset->size directly.
In this case, it will call the get_size() ported by arch dynamically to
support dynamic regset size case.

Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
---
 kernel/ptrace.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 43d6179508d6..6877105e1b1e 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -882,13 +882,18 @@ static int ptrace_regset(struct task_struct *task, int req, unsigned int type,
 	const struct user_regset_view *view = task_user_regset_view(task);
 	const struct user_regset *regset = find_regset(view, type);
 	int regset_no;
+	unsigned int size;
 
-	if (!regset || (kiov->iov_len % regset->size) != 0)
+	if (!regset)
 		return -EINVAL;
 
 	regset_no = regset - view->regsets;
-	kiov->iov_len = min(kiov->iov_len,
-			    (__kernel_size_t) (regset->n * regset->size));
+	size = regset_size(task, regset);
+
+	if ((kiov->iov_len % size) != 0)
+		return -EINVAL;
+
+	kiov->iov_len = min(kiov->iov_len, (__kernel_size_t) size);
 
 	if (req == PTRACE_GETREGSET)
 		return copy_regset_to_user(task, view, regset_no, 0,
-- 
2.26.2


  reply	other threads:[~2020-05-26  7:02 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-26  7:02 [RFC PATCH v4 00/13] riscv: Add vector ISA support Greentime Hu
2020-05-26  7:02 ` Greentime Hu [this message]
2020-05-26 14:00   ` [RFC PATCH v4 01/13] ptrace: Use regset_size() for dynamic regset size Oleg Nesterov
2020-05-26 14:00     ` Oleg Nesterov
2020-05-27  6:34     ` Greentime Hu
2020-05-27  6:34       ` Greentime Hu
2020-05-27 11:31       ` Oleg Nesterov
2020-05-27 11:31         ` Oleg Nesterov
2020-05-26  7:02 ` [RFC PATCH v4 02/13] riscv: Separate patch for cflags and aflags Greentime Hu
2020-05-26  7:02 ` [RFC PATCH v4 03/13] riscv: Rename __switch_to_aux -> fpu Greentime Hu
2020-05-26  7:02 ` [RFC PATCH v4 04/13] riscv: Extending cpufeature.c to detect V-extension Greentime Hu
2020-05-26  7:02 ` [RFC PATCH v4 05/13] riscv: Add new csr defines related to vector extension Greentime Hu
2020-05-31  1:56   ` Guo Ren
2020-05-31  1:56     ` Guo Ren
2020-06-01  8:15     ` Greentime Hu
2020-06-01  8:15       ` Greentime Hu
2020-06-01  8:59       ` Guo Ren
2020-06-01  8:59         ` Guo Ren
2020-06-01  9:03   ` Guo Ren
2020-06-01  9:03     ` Guo Ren
2020-05-26  7:02 ` [RFC PATCH v4 06/13] riscv: Add vector feature to compile Greentime Hu
2020-05-26  7:02 ` [RFC PATCH v4 07/13] riscv: Add has_vector/riscv_vsize to save vector features Greentime Hu
2020-05-31  0:58   ` Guo Ren
2020-05-31  0:58     ` Guo Ren
2020-06-01  8:07     ` Greentime Hu
2020-06-01  8:07       ` Greentime Hu
2020-06-01  9:13   ` Guo Ren
2020-06-01  9:13     ` Guo Ren
2020-05-26  7:02 ` [RFC PATCH v4 08/13] riscv: Reset vector register Greentime Hu
2020-05-26  7:02 ` [RFC PATCH v4 09/13] riscv: Add vector struct and assembler definitions Greentime Hu
2020-06-01  9:12   ` Guo Ren
2020-06-01  9:12     ` Guo Ren
2020-05-26  7:02 ` [RFC PATCH v4 10/13] riscv: Add task switch support for vector Greentime Hu
2020-05-31 15:29   ` Guo Ren
2020-05-31 15:29     ` Guo Ren
2020-05-31 16:08   ` Guo Ren
2020-05-31 16:08     ` Guo Ren
2020-06-01  9:12   ` Guo Ren
2020-06-01  9:12     ` Guo Ren
2020-05-26  7:02 ` [RFC PATCH v4 11/13] riscv: Add ptrace vector support Greentime Hu
2020-06-01  9:14   ` Guo Ren
2020-06-01  9:14     ` Guo Ren
2020-05-26  7:02 ` [RFC PATCH v4 12/13] riscv: Add sigcontext save/restore for vector Greentime Hu
2020-05-31 15:28   ` Guo Ren
2020-05-31 15:28     ` Guo Ren
2020-06-01  9:13   ` Guo Ren
2020-06-01  9:13     ` Guo Ren
2020-05-26  7:02 ` [RFC PATCH v4 13/13] riscv: signal: Report signal frame size to userspace via auxv Greentime Hu
2020-05-31 15:52 ` [RFC PATCH v4 00/13] riscv: Add vector ISA support Guo Ren
2020-05-31 15:52   ` Guo Ren
2020-06-02  2:21   ` Greentime Hu
2020-06-02  2:21     ` Greentime Hu
2020-06-02  3:08     ` Guo Ren
2020-06-02  3:08       ` Guo Ren

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