uml: throw out CONFIG_MODE_TT

This patchset throws out tt mode, which has been non-functional for a while.

This is done in phases, interspersed with code cleanups on the affected files.

The removal is done as follows:
	remove all code, config options, and files which depend on
CONFIG_MODE_TT
	get rid of the CHOOSE_MODE macro, which decided whether to
call tt-mode or skas-mode code, and replace invocations with their
skas portions
	replace all now-trivial procedures with their skas equivalents

There are now a bunch of now-redundant pieces of data structures, including
mode-specific pieces of the thread structure, pt_regs, and mm_context.  These
are all replaced with their skas-specific contents.

As part of the ongoing style compliance project, I made a style pass over all
files that were changed.  There are three such patches, one for each phase,
covering the files affected by that phase but no later ones.

I noticed that we weren't freeing the LDT state associated with a process when
it exited, so that's fixed in one of the later patches.

The last patch is a tidying patch which I've had for a while, but which caused
inexplicable crashes under tt mode.  Since that is no longer a problem, this
can now go in.

This patch:

Start getting rid of tt mode support.

This patch throws out CONFIG_MODE_TT and all config options, code, and files
which depend on it.

CONFIG_MODE_SKAS is gone and everything that depends on it is included
unconditionally.

The few changed lines are in re-written Kconfig help, lines which needed
something skas-related removed from them, and a few more which weren't
strictly deletions.

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>

1 files changed, 0 insertions, 120 deletions

diff --git a/arch/um/sys-i386/ptrace.c b/arch/um/sys-i386/ptrace.c
index 28bf01150323..572fd504b94b 100644
--- a/arch/um/sys-i386/ptrace.c
+++ b/arch/um/sys-i386/ptrace.c
@@ -14,12 +14,6 @@
 #include "sysdep/sigcontext.h"
 #include "sysdep/sc.h"
 
-void arch_switch_to_tt(struct task_struct *from, struct task_struct *to)
-{
-	update_debugregs(to->thread.arch.debugregs_seq);
-	arch_switch_tls_tt(from, to);
-}
-
 void arch_switch_to_skas(struct task_struct *from, struct task_struct *to)
 {
 	int err = arch_switch_tls_skas(from, to);
@@ -233,79 +227,12 @@ static inline unsigned long twd_fxsr_to_i387( struct i387_fxsave_struct *fxsave
 	return ret;
 }
 
-/*
- * FXSR floating point environment conversions.
- */
-
-#ifdef CONFIG_MODE_TT
-static inline int convert_fxsr_to_user_tt(struct _fpstate __user *buf,
-					  struct pt_regs *regs)
-{
-	struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
-	unsigned long env[7];
-	struct _fpreg __user *to;
-	struct _fpxreg *from;
-	int i;
-
-	env[0] = (unsigned long)fxsave->cwd | 0xffff0000;
-	env[1] = (unsigned long)fxsave->swd | 0xffff0000;
-	env[2] = twd_fxsr_to_i387(fxsave);
-	env[3] = fxsave->fip;
-	env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16);
-	env[5] = fxsave->foo;
-	env[6] = fxsave->fos;
-
-	if ( __copy_to_user( buf, env, 7 * sizeof(unsigned long) ) )
-		return 1;
-
-	to = &buf->_st[0];
-	from = (struct _fpxreg *) &fxsave->st_space[0];
-	for ( i = 0 ; i < 8 ; i++, to++, from++ ) {
-		if ( __copy_to_user( to, from, sizeof(*to) ) )
-			return 1;
-	}
-	return 0;
-}
-#endif
-
 static inline int convert_fxsr_to_user(struct _fpstate __user *buf,
 				       struct pt_regs *regs)
 {
 	return(CHOOSE_MODE(convert_fxsr_to_user_tt(buf, regs), 0));
 }
 
-#ifdef CONFIG_MODE_TT
-static inline int convert_fxsr_from_user_tt(struct pt_regs *regs,
-					    struct _fpstate __user *buf)
-{
-	struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
-	unsigned long env[7];
-	struct _fpxreg *to;
-	struct _fpreg __user *from;
-	int i;
-
-	if ( __copy_from_user( env, buf, 7 * sizeof(long) ) )
-		return 1;
-
-	fxsave->cwd = (unsigned short)(env[0] & 0xffff);
-	fxsave->swd = (unsigned short)(env[1] & 0xffff);
-	fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff));
-	fxsave->fip = env[3];
-	fxsave->fop = (unsigned short)((env[4] & 0xffff0000) >> 16);
-	fxsave->fcs = (env[4] & 0xffff);
-	fxsave->foo = env[5];
-	fxsave->fos = env[6];
-
-	to = (struct _fpxreg *) &fxsave->st_space[0];
-	from = &buf->_st[0];
-	for ( i = 0 ; i < 8 ; i++, to++, from++ ) {
-		if ( __copy_from_user( to, from, sizeof(*from) ) )
-			return 1;
-	}
-	return 0;
-}
-#endif
-
 static inline int convert_fxsr_from_user(struct pt_regs *regs, 
 					 struct _fpstate __user *buf)
 {
@@ -332,39 +259,11 @@ int set_fpregs(unsigned long buf, struct task_struct *child)
 	else return(0);
 }
 
-#ifdef CONFIG_MODE_TT
-int get_fpxregs_tt(unsigned long buf, struct task_struct *tsk)
-{
-	struct pt_regs *regs = &tsk->thread.regs;
-	struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
-	int err;
-
-	err = __copy_to_user((void __user *) buf, fxsave,
-			     sizeof(struct user_fxsr_struct));
-	if(err) return -EFAULT;
-	else return 0;
-}
-#endif
-
 int get_fpxregs(unsigned long buf, struct task_struct *tsk)
 {
 	return(CHOOSE_MODE(get_fpxregs_tt(buf, tsk), 0));
 }
 
-#ifdef CONFIG_MODE_TT
-int set_fpxregs_tt(unsigned long buf, struct task_struct *tsk)
-{
-	struct pt_regs *regs = &tsk->thread.regs;
-	struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
-	int err;
-
-	err = __copy_from_user(fxsave, (void __user *) buf,
-			       sizeof(struct user_fxsr_struct) );
-	if(err) return -EFAULT;
-	else return 0;
-}
-#endif
-
 int set_fpxregs(unsigned long buf, struct task_struct *tsk)
 {
 	return(CHOOSE_MODE(set_fpxregs_tt(buf, tsk), 0));
@@ -387,25 +286,6 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
 }
 #endif
 
-#ifdef CONFIG_MODE_TT
-static inline void copy_fpu_fxsave_tt(struct pt_regs *regs,
-				      struct user_i387_struct *buf)
-{
-	struct i387_fxsave_struct *fpu = SC_FXSR_ENV(PT_REGS_SC(regs));
-	unsigned short *to;
-	unsigned short *from;
-	int i;
-
-	memcpy( buf, fpu, 7 * sizeof(long) );
-
-	to = (unsigned short *) &buf->st_space[0];
-	from = (unsigned short *) &fpu->st_space[0];
-	for ( i = 0 ; i < 8 ; i++, to += 5, from += 8 ) {
-		memcpy( to, from, 5 * sizeof(unsigned short) );
-	}
-}
-#endif
-
 static inline void copy_fpu_fxsave(struct pt_regs *regs,
 				   struct user_i387_struct *buf)
 {