181 lines
4.5 KiB
C
181 lines
4.5 KiB
C
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/*
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* This file contains various random system calls that
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* have a non-standard calling sequence on the Linux/Meta
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* platform.
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/syscalls.h>
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#include <linux/mman.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/uaccess.h>
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#include <linux/unistd.h>
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#include <asm/cacheflush.h>
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#include <asm/core_reg.h>
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#include <asm/global_lock.h>
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#include <asm/switch.h>
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#include <asm/syscall.h>
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#include <asm/syscalls.h>
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#include <asm/user_gateway.h>
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#define merge_64(hi, lo) ((((unsigned long long)(hi)) << 32) + \
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((lo) & 0xffffffffUL))
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int metag_mmap_check(unsigned long addr, unsigned long len,
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unsigned long flags)
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{
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/* We can't have people trying to write to the bottom of the
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* memory map, there are mysterious unspecified things there that
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* we don't want people trampling on.
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*/
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if ((flags & MAP_FIXED) && (addr < TASK_UNMAPPED_BASE))
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return -EINVAL;
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return 0;
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}
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asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long pgoff)
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{
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/* The shift for mmap2 is constant, regardless of PAGE_SIZE setting. */
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if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1))
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return -EINVAL;
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pgoff >>= PAGE_SHIFT - 12;
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return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
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}
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asmlinkage int sys_metag_setglobalbit(char __user *addr, int mask)
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{
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char tmp;
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int ret = 0;
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unsigned int flags;
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if (!((__force unsigned int)addr >= LINCORE_BASE))
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return -EFAULT;
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__global_lock2(flags);
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metag_data_cache_flush((__force void *)addr, sizeof(mask));
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ret = __get_user(tmp, addr);
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if (ret)
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goto out;
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tmp |= mask;
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ret = __put_user(tmp, addr);
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metag_data_cache_flush((__force void *)addr, sizeof(mask));
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out:
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__global_unlock2(flags);
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return ret;
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}
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#define TXDEFR_FPU_MASK ((0x1f << 16) | 0x1f)
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asmlinkage void sys_metag_set_fpu_flags(unsigned int flags)
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{
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unsigned int temp;
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flags &= TXDEFR_FPU_MASK;
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temp = __core_reg_get(TXDEFR);
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temp &= ~TXDEFR_FPU_MASK;
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temp |= flags;
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__core_reg_set(TXDEFR, temp);
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}
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asmlinkage int sys_metag_set_tls(void __user *ptr)
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{
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current->thread.tls_ptr = ptr;
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set_gateway_tls(ptr);
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return 0;
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}
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asmlinkage void *sys_metag_get_tls(void)
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{
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return (__force void *)current->thread.tls_ptr;
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}
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asmlinkage long sys_truncate64_metag(const char __user *path, unsigned long lo,
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unsigned long hi)
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{
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return sys_truncate64(path, merge_64(hi, lo));
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}
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asmlinkage long sys_ftruncate64_metag(unsigned int fd, unsigned long lo,
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unsigned long hi)
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{
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return sys_ftruncate64(fd, merge_64(hi, lo));
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}
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asmlinkage long sys_fadvise64_64_metag(int fd, unsigned long offs_lo,
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unsigned long offs_hi,
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unsigned long len_lo,
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unsigned long len_hi, int advice)
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{
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return sys_fadvise64_64(fd, merge_64(offs_hi, offs_lo),
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merge_64(len_hi, len_lo), advice);
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}
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asmlinkage long sys_readahead_metag(int fd, unsigned long lo, unsigned long hi,
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size_t count)
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{
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return sys_readahead(fd, merge_64(hi, lo), count);
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}
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asmlinkage ssize_t sys_pread64_metag(unsigned long fd, char __user *buf,
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size_t count, unsigned long lo,
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unsigned long hi)
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{
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return sys_pread64(fd, buf, count, merge_64(hi, lo));
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}
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asmlinkage ssize_t sys_pwrite64_metag(unsigned long fd, char __user *buf,
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size_t count, unsigned long lo,
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unsigned long hi)
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{
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return sys_pwrite64(fd, buf, count, merge_64(hi, lo));
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}
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asmlinkage long sys_sync_file_range_metag(int fd, unsigned long offs_lo,
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unsigned long offs_hi,
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unsigned long len_lo,
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unsigned long len_hi,
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unsigned int flags)
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{
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return sys_sync_file_range(fd, merge_64(offs_hi, offs_lo),
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merge_64(len_hi, len_lo), flags);
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}
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/* Provide the actual syscall number to call mapping. */
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#undef __SYSCALL
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#define __SYSCALL(nr, call) [nr] = (call),
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/*
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* We need wrappers for anything with unaligned 64bit arguments
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*/
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#define sys_truncate64 sys_truncate64_metag
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#define sys_ftruncate64 sys_ftruncate64_metag
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#define sys_fadvise64_64 sys_fadvise64_64_metag
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#define sys_readahead sys_readahead_metag
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#define sys_pread64 sys_pread64_metag
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#define sys_pwrite64 sys_pwrite64_metag
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#define sys_sync_file_range sys_sync_file_range_metag
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/*
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* Note that we can't include <linux/unistd.h> here since the header
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* guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
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*/
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const void *sys_call_table[__NR_syscalls] = {
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[0 ... __NR_syscalls-1] = sys_ni_syscall,
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#include <asm/unistd.h>
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};
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