Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * arch/xtensa/kernel/syscall.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * License.  See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * Copyright (C) 2001 - 2005 Tensilica Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * Copyright (C) 2000 Silicon Graphics, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * Copyright (C) 1995 - 2000 by Ralf Baechle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  * Chris Zankel <chris@zankel.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  * Kevin Chea
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <asm/syscall.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/stringify.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/sched/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/shm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) syscall_t sys_call_table[__NR_syscalls] /* FIXME __cacheline_aligned */= {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	[0 ... __NR_syscalls - 1] = (syscall_t)&sys_ni_syscall,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define __SYSCALL(nr, entry, nargs)[nr] = (syscall_t)entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <asm/syscall_table.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #undef __SYSCALL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define COLOUR_ALIGN(addr, pgoff) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) + \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	 (((pgoff) << PAGE_SHIFT) & (SHMLBA - 1)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	unsigned long ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	long err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	return (long)ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) asmlinkage long xtensa_fadvise64_64(int fd, int advice,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		unsigned long long offset, unsigned long long len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	return ksys_fadvise64_64(fd, offset, len, advice);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) #ifdef CONFIG_MMU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 		unsigned long len, unsigned long pgoff, unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	struct vm_area_struct *vmm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	if (flags & MAP_FIXED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 		/* We do not accept a shared mapping if it would violate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 		 * cache aliasing constraints.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 		if ((flags & MAP_SHARED) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 				((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 		return addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	if (len > TASK_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	if (!addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 		addr = TASK_UNMAPPED_BASE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 	if (flags & MAP_SHARED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 		addr = COLOUR_ALIGN(addr, pgoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) 		addr = PAGE_ALIGN(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 	for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) 		/* At this point:  (!vmm || addr < vmm->vm_end). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) 		if (TASK_SIZE - len < addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) 		if (!vmm || addr + len <= vm_start_gap(vmm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) 			return addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) 		addr = vmm->vm_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) 		if (flags & MAP_SHARED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) 			addr = COLOUR_ALIGN(addr, pgoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) #endif