From: Guo Ren <ren_guo@c-sky.com>
To: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
tglx@linutronix.de, daniel.lezcano@linaro.org,
jason@lakedaemon.net, arnd@arndb.de, devicetree@vger.kernel.org,
andrea.parri@amarulasolutions.com, peterz@infradead.org
Cc: c-sky_gcc_upstream@c-sky.com, gnu-csky@mentor.com,
thomas.petazzoni@bootlin.com, wbx@uclibc-ng.org,
ren_guo@c-sky.com, green.hu@gmail.com
Subject: [PATCH V3 09/27] csky: VDSO and rt_sigreturn
Date: Wed, 12 Sep 2018 21:24:43 +0800 [thread overview]
Message-ID: <84b9dbc12dbd64c424d81356bce15bdde4c54eb8.1536757532.git.ren_guo@c-sky.com> (raw)
In-Reply-To: <cover.1536757532.git.ren_guo@c-sky.com>
In-Reply-To: <cover.1536757532.git.ren_guo@c-sky.com>
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 | 24 ++++++++++++
arch/csky/include/asm/vdso.h | 12 ++++++
arch/csky/kernel/vdso.c | 85 ++++++++++++++++++++++++++++++++++++++++++
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..a99f0e4
--- /dev/null
+++ b/arch/csky/abiv1/inc/abi/vdso.h
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+#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..2b5f43b
--- /dev/null
+++ b/arch/csky/abiv2/inc/abi/vdso.h
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#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..b275440
--- /dev/null
+++ b/arch/csky/include/asm/vdso.h
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+#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..55ed68b
--- /dev/null
+++ b/arch/csky/kernel/vdso.c
@@ -0,0 +1,85 @@
+// 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:[~2018-09-12 13:27 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-12 13:24 [PATCH V4 00/27] C-SKY(csky) Linux Kernel Port Guo Ren
2018-09-12 13:24 ` [PATCH V3 01/27] csky: Build infrastructure Guo Ren
2018-09-12 13:24 ` [PATCH V3 02/27] csky: defconfig Guo Ren
2018-09-12 13:24 ` [PATCH V3 03/27] csky: Kernel booting Guo Ren
2018-09-12 13:24 ` [PATCH V3 04/27] csky: Exception handling Guo Ren
2018-09-12 13:24 ` [PATCH V3 05/27] csky: System Call Guo Ren
2018-09-12 13:24 ` [PATCH V3 06/27] csky: Cache and TLB routines Guo Ren
2018-09-12 13:24 ` [PATCH V3 07/27] csky: MMU and page table management Guo Ren
2018-09-12 13:24 ` [PATCH V3 08/27] csky: Process management and Signal Guo Ren
2018-09-12 13:24 ` Guo Ren [this message]
2018-09-12 13:24 ` [PATCH V3 10/27] csky: IRQ handling Guo Ren
2018-09-12 13:24 ` [PATCH V3 12/27] csky: ELF and module probe Guo Ren
2018-09-12 13:24 ` [PATCH V3 13/27] csky: Library functions Guo Ren
2018-09-12 13:24 ` [PATCH V3 14/27] csky: User access Guo Ren
2018-09-12 13:24 ` [PATCH V3 15/27] csky: Debug and Ptrace GDB Guo Ren
2018-09-12 13:24 ` [PATCH V3 16/27] csky: SMP support Guo Ren
2018-09-12 13:24 ` [PATCH V3 18/27] dt-bindings: csky CPU Bindings Guo Ren
2018-09-12 13:24 ` [PATCH V3 19/27] dt-bindings: timer: gx6605s SOC timer Guo Ren
2018-09-12 13:24 ` [PATCH V3 20/27] dt-bindings: timer: C-SKY Multi-processor timer Guo Ren
2018-09-12 13:24 ` [PATCH V3 22/27] dt-bindings: interrupt-controller: C-SKY SMP intc Guo Ren
2018-09-12 13:24 ` [PATCH V3 23/27] clocksource: add gx6605s SOC system timer Guo Ren
[not found] ` <abb46d366b513b814f7af234d560306a818b7324.1536757532.git.ren_guo@c-sky.com>
2018-09-12 14:22 ` [PATCH V3 17/27] csky: Misc headers Arnd Bergmann
2018-09-12 14:30 ` [PATCH V4 00/27] C-SKY(csky) Linux Kernel Port Arnd Bergmann
2018-09-14 14:37 ` Guo Ren
2018-09-14 14:46 ` Arnd Bergmann
2018-09-14 16:02 ` Guo Ren
2018-09-14 16:09 ` Arnd Bergmann
2018-09-14 23:28 ` Guo Ren
2018-09-20 17:52 ` Palmer Dabbelt
2018-09-21 5:18 ` Arnd Bergmann
2018-09-21 23:48 ` Guo Ren
2018-09-24 7:21 ` Geert Uytterhoeven
2018-09-24 8:47 ` Arnd Bergmann
2018-09-16 1:07 ` Guo Ren
2018-09-16 4:53 ` Guo Ren
2018-09-17 11:54 ` Stephen Rothwell
2018-09-17 12:03 ` Stephen Rothwell
2018-09-17 14:50 ` Guo Ren
2018-09-17 14:37 ` Guo Ren
[not found] ` <93e8b592e429c156ad4d4ca5d85ef48fd0ab8b70.1536757532.git.ren_guo@c-sky.com>
2018-09-12 15:55 ` [PATCH V3 11/27] csky: Atomic operations Peter Zijlstra
2018-09-15 14:55 ` Guo Ren
2018-09-17 8:17 ` Peter Zijlstra
2018-09-17 15:05 ` Guo Ren
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