diff options
Diffstat (limited to 'arch/mips/include/asm/vdso.h')
| -rw-r--r-- | arch/mips/include/asm/vdso.h | 73 |
1 files changed, 57 insertions, 16 deletions
diff --git a/arch/mips/include/asm/vdso.h b/arch/mips/include/asm/vdso.h index cca56aa40ff4..db2d45be8f2e 100644 --- a/arch/mips/include/asm/vdso.h +++ b/arch/mips/include/asm/vdso.h @@ -1,29 +1,70 @@ /* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. + * Copyright (C) 2015 Imagination Technologies + * Author: Alex Smith <alex.smith@imgtec.com> * - * Copyright (C) 2009 Cavium Networks + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. */ #ifndef __ASM_VDSO_H #define __ASM_VDSO_H -#include <linux/types.h> +#include <linux/mm_types.h> +/** + * struct mips_vdso_image - Details of a VDSO image. + * @data: Pointer to VDSO image data (page-aligned). + * @size: Size of the VDSO image data (page-aligned). + * @off_sigreturn: Offset of the sigreturn() trampoline. + * @off_rt_sigreturn: Offset of the rt_sigreturn() trampoline. + * @mapping: Special mapping structure. + * + * This structure contains details of a VDSO image, including the image data + * and offsets of certain symbols required by the kernel. It is generated as + * part of the VDSO build process, aside from the mapping page array, which is + * populated at runtime. + */ +struct mips_vdso_image { + void *data; + unsigned long size; -#ifdef CONFIG_32BIT -struct mips_vdso { - u32 signal_trampoline[2]; - u32 rt_signal_trampoline[2]; + unsigned long off_sigreturn; + unsigned long off_rt_sigreturn; + + struct vm_special_mapping mapping; }; -#else /* !CONFIG_32BIT */ -struct mips_vdso { - u32 o32_signal_trampoline[2]; - u32 o32_rt_signal_trampoline[2]; - u32 rt_signal_trampoline[2]; - u32 n32_rt_signal_trampoline[2]; + +/* + * The following structures are auto-generated as part of the build for each + * ABI by genvdso, see arch/mips/vdso/Makefile. + */ + +extern struct mips_vdso_image vdso_image; + +#ifdef CONFIG_MIPS32_O32 +extern struct mips_vdso_image vdso_image_o32; +#endif + +#ifdef CONFIG_MIPS32_N32 +extern struct mips_vdso_image vdso_image_n32; +#endif + +/** + * union mips_vdso_data - Data provided by the kernel for the VDSO. + * + * This structure contains data needed by functions within the VDSO. It is + * populated by the kernel and mapped read-only into user memory. + * + * Note: Care should be taken when modifying as the layout must remain the same + * for both 64- and 32-bit (for 32-bit userland on 64-bit kernel). + */ +union mips_vdso_data { + struct { + }; + + u8 page[PAGE_SIZE]; }; -#endif /* CONFIG_32BIT */ #endif /* __ASM_VDSO_H */ |