linux/arch/um/include/user.h
Jeff Dike 42daba3165 uml: stop saving process FP state
Throw out a lot of code dealing with saving and restoring floating-point
state.  In skas mode, where processes run in a restoring floating-point state
on kernel entry and exit is pointless.

This eliminates most of arch/um/os-Linux/sys-{i386,x86_64}/registers.c.  Most
of what remained is now arch-indpendent, and can be moved up to
arch/um/os-Linux/registers.c.  Both arches need the jmp_buf accessor
get_thread_reg, and i386 needs {save,restore}_fp_regs because it cheats during
sigreturn by getting the fp state using ptrace rather than copying it out of
the process sigcontext.

After this, it turns out that arch/um/include/skas/mode-skas.h is almost
completely unneeded.  The declarations in it are variables which either don't
exist or which don't have global scope.  The one exception is
kill_off_processes_skas.  If that's removed, this header can be deleted.

This uncovered a bug in user.h, which wasn't correctly making sure that a
size_t definition was available to both userspace and kernelspace files.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 09:43:05 -07:00

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906 B
C

/*
* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#ifndef __USER_H__
#define __USER_H__
/*
* The usual definition - copied here because the kernel provides its own,
* fancier, type-safe, definition. Using that one would require
* copying too much infrastructure for my taste, so userspace files
* get less checking than kernel files.
*/
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
/* This is to get size_t */
#ifdef __KERNEL__
#include <linux/types.h>
#else
#include <stddef.h>
#endif
extern void panic(const char *fmt, ...)
__attribute__ ((format (printf, 1, 2)));
extern int printk(const char *fmt, ...)
__attribute__ ((format (printf, 1, 2)));
extern void schedule(void);
extern int in_aton(char *str);
extern int open_gdb_chan(void);
extern size_t strlcpy(char *, const char *, size_t);
extern size_t strlcat(char *, const char *, size_t);
#endif