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Diffstat (limited to '')
| -rw-r--r-- | arch/xtensa/kernel/syscall.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/syscall.c b/arch/xtensa/kernel/syscall.c new file mode 100644 index 000000000..2c415fce6 --- /dev/null +++ b/arch/xtensa/kernel/syscall.c @@ -0,0 +1,97 @@ +/* + * arch/xtensa/kernel/syscall.c + * + * 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) 2001 - 2005 Tensilica Inc. + * Copyright (C) 2000 Silicon Graphics, Inc. + * Copyright (C) 1995 - 2000 by Ralf Baechle + * + * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com> + * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca> + * Chris Zankel <chris@zankel.net> + * Kevin Chea + * + */ +#include <linux/uaccess.h> +#include <asm/syscall.h> +#include <asm/unistd.h> +#include <linux/linkage.h> +#include <linux/stringify.h> +#include <linux/errno.h> +#include <linux/syscalls.h> +#include <linux/file.h> +#include <linux/fs.h> +#include <linux/mman.h> +#include <linux/sched/mm.h> +#include <linux/shm.h> + +syscall_t sys_call_table[__NR_syscalls] /* FIXME __cacheline_aligned */= { + [0 ... __NR_syscalls - 1] = (syscall_t)&sys_ni_syscall, + +#define __SYSCALL(nr, entry, nargs)[nr] = (syscall_t)entry, +#include <asm/syscall_table.h> +#undef __SYSCALL +}; + +#define COLOUR_ALIGN(addr, pgoff) \ + ((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) + \ + (((pgoff) << PAGE_SHIFT) & (SHMLBA - 1))) + +asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg) +{ + unsigned long ret; + long err; + + err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA); + if (err) + return err; + return (long)ret; +} + +asmlinkage long xtensa_fadvise64_64(int fd, int advice, + unsigned long long offset, unsigned long long len) +{ + return ksys_fadvise64_64(fd, offset, len, advice); +} + +#ifdef CONFIG_MMU +unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, + unsigned long len, unsigned long pgoff, unsigned long flags) +{ + struct vm_area_struct *vmm; + + if (flags & MAP_FIXED) { + /* We do not accept a shared mapping if it would violate + * cache aliasing constraints. + */ + if ((flags & MAP_SHARED) && + ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) + return -EINVAL; + return addr; + } + + if (len > TASK_SIZE) + return -ENOMEM; + if (!addr) + addr = TASK_UNMAPPED_BASE; + + if (flags & MAP_SHARED) + addr = COLOUR_ALIGN(addr, pgoff); + else + addr = PAGE_ALIGN(addr); + + for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { + /* At this point: (!vmm || addr < vmm->vm_end). */ + if (TASK_SIZE - len < addr) + return -ENOMEM; + if (!vmm || addr + len <= vm_start_gap(vmm)) + return addr; + addr = vmm->vm_end; + if (flags & MAP_SHARED) + addr = COLOUR_ALIGN(addr, pgoff); + } +} +#endif |