arch/mips/kernel/linux32.c

Source file repositories/reference/linux-study-clean/arch/mips/kernel/linux32.c

File Facts

System
Linux kernel
Corpus path
arch/mips/kernel/linux32.c
Extension
.c
Size
3669 bytes
Lines
135
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: syscall or user/kernel boundary
Status
core implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
	unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
{
	return ksys_truncate(path, merge_64(a2, a3));
}

SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
	unsigned long, a2, unsigned long, a3)
{
	return ksys_ftruncate(fd, merge_64(a2, a3), FTRUNCATE_LFS);
}

SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
		unsigned int, offset_low, loff_t __user *, result,
		unsigned int, origin)
{
	return sys_llseek(fd, offset_high, offset_low, result, origin);
}

/* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
   lseek back to original location.  They fail just like lseek does on
   non-seekable files.	*/

SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
	unsigned long, unused, unsigned long, a4, unsigned long, a5)
{
	return ksys_pread64(fd, buf, count, merge_64(a4, a5));
}

SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
	size_t, count, u32, unused, u64, a4, u64, a5)
{
	return ksys_pwrite64(fd, buf, count, merge_64(a4, a5));
}

SYSCALL_DEFINE1(32_personality, unsigned long, personality)
{
	unsigned int p = personality & 0xffffffff;
	int ret;

	if (personality(current->personality) == PER_LINUX32 &&
	    personality(p) == PER_LINUX)
		p = (p & ~PER_MASK) | PER_LINUX32;
	ret = sys_personality(p);
	if (ret != -1 && personality(ret) == PER_LINUX32)
		ret = (ret & ~PER_MASK) | PER_LINUX;
	return ret;
}

asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
				   size_t count)
{
	return ksys_readahead(fd, merge_64(a2, a3), count);
}

asmlinkage long sys32_sync_file_range(int fd, int __pad,
	unsigned long a2, unsigned long a3,
	unsigned long a4, unsigned long a5,
	int flags)
{
	return ksys_sync_file_range(fd,
			merge_64(a2, a3), merge_64(a4, a5),
			flags);
}

asmlinkage long sys32_fadvise64_64(int fd, int __pad,
	unsigned long a2, unsigned long a3,
	unsigned long a4, unsigned long a5,
	int flags)
{
	return ksys_fadvise64_64(fd,
			merge_64(a2, a3), merge_64(a4, a5),
			flags);
}

asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
	unsigned offset_a3, unsigned len_a4, unsigned len_a5)
{
	return ksys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
			      merge_64(len_a4, len_a5));
}

Annotation

Implementation Notes