From: Guo Ren <ren_guo@c-sky.com>
To: akpm@linux-foundation.org, arnd@arndb.de,
daniel.lezcano@linaro.org, davem@davemloft.net,
gregkh@linuxfoundation.org, hch@infradead.org,
marc.zyngier@arm.com, mark.rutland@arm.com, peterz@infradead.org,
robh@kernel.org, tglx@linutronix.de
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
devicetree@vger.kernel.org, robh+dt@kernel.org,
c-sky_gcc_upstream@c-sky.com, Guo Ren <ren_guo@c-sky.com>
Subject: [PATCH V8 09/21] csky: VDSO and rt_sigreturn
Date: Fri, 12 Oct 2018 12:42:44 +0800 [thread overview]
Message-ID: <9f8264bd92aceca78d2a95a45710908905421a47.1539315391.git.ren_guo@c-sky.com> (raw)
In-Reply-To: <cover.1539315390.git.ren_guo@c-sky.com>
In-Reply-To: <cover.1539315390.git.ren_guo@c-sky.com>
This patch adds files related to VDSO and our VDSO only support
rt_sigreturn.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
---
arch/csky/abiv1/inc/abi/vdso.h | 17 +++++++++
arch/csky/abiv2/inc/abi/vdso.h | 23 +++++++++++
arch/csky/include/asm/vdso.h | 12 ++++++
arch/csky/kernel/vdso.c | 86 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 138 insertions(+)
create mode 100644 arch/csky/abiv1/inc/abi/vdso.h
create mode 100644 arch/csky/abiv2/inc/abi/vdso.h
create mode 100644 arch/csky/include/asm/vdso.h
create mode 100644 arch/csky/kernel/vdso.c
diff --git a/arch/csky/abiv1/inc/abi/vdso.h b/arch/csky/abiv1/inc/abi/vdso.h
new file mode 100644
index 0000000..14352f5
--- /dev/null
+++ b/arch/csky/abiv1/inc/abi/vdso.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <linux/uaccess.h>
+
+static inline int setup_vdso_page(unsigned short *ptr)
+{
+ int err = 0;
+
+ /* movi r1, 127 */
+ err |= __put_user(0x67f1, ptr + 0);
+ /* addi r1, (139 - 127) */
+ err |= __put_user(0x20b1, ptr + 1);
+ /* trap 0 */
+ err |= __put_user(0x0008, ptr + 2);
+
+ return err;
+}
diff --git a/arch/csky/abiv2/inc/abi/vdso.h b/arch/csky/abiv2/inc/abi/vdso.h
new file mode 100644
index 0000000..b60d4a0
--- /dev/null
+++ b/arch/csky/abiv2/inc/abi/vdso.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ABI_CSKY_VDSO_H
+#define __ABI_CSKY_VDSO_H
+
+#include <linux/uaccess.h>
+
+static inline int setup_vdso_page(unsigned short *ptr)
+{
+ int err = 0;
+
+ /* movi r7, 173 */
+ err |= __put_user(0xea07, ptr);
+ err |= __put_user(0x008b, ptr+1);
+
+ /* trap 0 */
+ err |= __put_user(0xc000, ptr+2);
+ err |= __put_user(0x2020, ptr+3);
+
+ return err;
+}
+
+#endif /* __ABI_CSKY_STRING_H */
diff --git a/arch/csky/include/asm/vdso.h b/arch/csky/include/asm/vdso.h
new file mode 100644
index 0000000..d963d69
--- /dev/null
+++ b/arch/csky/include/asm/vdso.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_CSKY_VDSO_H
+#define __ASM_CSKY_VDSO_H
+
+#include <abi/vdso.h>
+
+struct csky_vdso {
+ unsigned short rt_signal_retcode[4];
+};
+
+#endif /* __ASM_CSKY_VDSO_H */
diff --git a/arch/csky/kernel/vdso.c b/arch/csky/kernel/vdso.c
new file mode 100644
index 0000000..60ff7ad
--- /dev/null
+++ b/arch/csky/kernel/vdso.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/binfmts.h>
+#include <linux/elf.h>
+#include <linux/vmalloc.h>
+#include <linux/unistd.h>
+#include <linux/uaccess.h>
+
+#include <asm/vdso.h>
+#include <asm/cacheflush.h>
+
+static struct page *vdso_page;
+
+static int __init init_vdso(void)
+{
+ struct csky_vdso *vdso;
+ int err = 0;
+
+ vdso_page = alloc_page(GFP_KERNEL);
+ if (!vdso_page)
+ panic("Cannot allocate vdso");
+
+ vdso = vmap(&vdso_page, 1, 0, PAGE_KERNEL);
+ if (!vdso)
+ panic("Cannot map vdso");
+
+ clear_page(vdso);
+
+ err = setup_vdso_page(vdso->rt_signal_retcode);
+ if (err)
+ panic("Cannot set signal return code, err: %x.", err);
+
+ dcache_wb_range((unsigned long)vdso, (unsigned long)vdso + 16);
+
+ vunmap(vdso);
+
+ return 0;
+}
+subsys_initcall(init_vdso);
+
+int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
+{
+ int ret;
+ unsigned long addr;
+ struct mm_struct *mm = current->mm;
+
+ down_write(&mm->mmap_sem);
+
+ addr = get_unmapped_area(NULL, STACK_TOP, PAGE_SIZE, 0, 0);
+ if (IS_ERR_VALUE(addr)) {
+ ret = addr;
+ goto up_fail;
+ }
+
+ ret = install_special_mapping(
+ mm,
+ addr,
+ PAGE_SIZE,
+ VM_READ|VM_EXEC|VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
+ &vdso_page);
+ if (ret)
+ goto up_fail;
+
+ mm->context.vdso = (void *)addr;
+
+up_fail:
+ up_write(&mm->mmap_sem);
+ return ret;
+}
+
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+ if (vma->vm_mm == NULL)
+ return NULL;
+
+ if (vma->vm_start == (long)vma->vm_mm->context.vdso)
+ return "[vdso]";
+ else
+ return NULL;
+}
--
2.7.4
next prev parent reply other threads:[~2018-10-12 4:47 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-12 4:42 [PATCH V8 00/21] C-SKY(csky) Linux Kernel Port Guo Ren
2018-10-12 4:42 ` [PATCH V8 01/21] csky: Build infrastructure Guo Ren
2018-10-12 4:42 ` [PATCH V8 02/21] csky: defconfig Guo Ren
2018-10-12 4:42 ` [PATCH V8 03/21] csky: Kernel booting Guo Ren
2018-10-12 4:42 ` [PATCH V8 04/21] csky: Exception handling and mm-fault Guo Ren
2018-10-12 4:42 ` [PATCH V8 05/21] csky: System Call Guo Ren
2018-10-12 4:42 ` [PATCH V8 06/21] csky: Cache and TLB routines Guo Ren
2018-10-12 4:42 ` [PATCH V8 07/21] csky: MMU and page table management Guo Ren
2018-10-12 4:42 ` [PATCH V8 08/21] csky: Process management and Signal Guo Ren
2018-10-12 4:42 ` Guo Ren [this message]
2018-10-12 4:42 ` [PATCH V8 10/21] csky: IRQ handling Guo Ren
2018-10-12 4:42 ` [PATCH V8 11/21] csky: Atomic operations Guo Ren
2018-10-12 4:42 ` [PATCH V8 12/21] csky: ELF and module probe Guo Ren
2018-10-12 4:42 ` [PATCH V8 13/21] csky: Library functions Guo Ren
2018-10-12 4:42 ` [PATCH V8 14/21] csky: User access Guo Ren
2018-10-12 4:42 ` [PATCH V8 15/21] csky: Debug and Ptrace GDB Guo Ren
2018-10-12 4:42 ` [PATCH V8 16/21] csky: SMP support Guo Ren
2018-10-12 11:09 ` Marc Zyngier
2018-10-13 6:10 ` Guo Ren
2018-10-12 4:42 ` [PATCH V8 17/21] csky: Misc headers Guo Ren
2018-10-12 4:42 ` [PATCH V8 18/21] dt-bindings: csky CPU Bindings Guo Ren
2018-10-12 11:35 ` Rob Herring
2018-10-12 12:18 ` Guo Ren
2018-10-12 4:42 ` [PATCH V8 19/21] dt-bindings: Add vendor prefix for csky Guo Ren
2018-10-12 4:42 ` [PATCH V8 20/21] MAINTAINERS: Add csky Guo Ren
2018-10-12 4:42 ` [PATCH V8 21/21] csky: add support get_user_size access dword Guo Ren
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