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, 60 deletions

diff --git a/arch/um/kernel/tt/syscall_user.c b/arch/um/kernel/tt/syscall_user.c
deleted file mode 100644
index f52b47aff1d2..000000000000
--- a/arch/um/kernel/tt/syscall_user.c
+++ /dev/null
@@ -1,60 +0,0 @@
-/* 
- * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#include <unistd.h>
-#include <signal.h>
-#include <errno.h>
-#include <asm/unistd.h>
-#include "sysdep/ptrace.h"
-#include "sigcontext.h"
-#include "ptrace_user.h"
-#include "task.h"
-#include "kern_util.h"
-#include "syscall.h"
-#include "tt.h"
-
-void do_sigtrap(void *task)
-{
-        UPT_SYSCALL_NR(TASK_REGS(task)) = -1;
-}
-
-void do_syscall(void *task, int pid, int local_using_sysemu)
-{
-        unsigned long proc_regs[FRAME_SIZE];
-
-        if(ptrace_getregs(pid, proc_regs) < 0)
-                tracer_panic("Couldn't read registers");
-
-        UPT_SYSCALL_NR(TASK_REGS(task)) = PT_SYSCALL_NR(proc_regs);
-
-#ifdef UPT_ORIGGPR2
-        UPT_ORIGGPR2(TASK_REGS(task)) = REGS_ORIGGPR2(proc_regs);
-#endif
-
-        if(((unsigned long *) PT_IP(proc_regs) >= &_stext) &&
-           ((unsigned long *) PT_IP(proc_regs) <= &_etext))
-                tracer_panic("I'm tracing myself and I can't get out");
-
-        /* advanced sysemu mode set syscall number to -1 automatically */
-        if (local_using_sysemu==2)
-                return;
-
-        /* syscall number -1 in sysemu skips syscall restarting in host */
-        if(ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET,
-                  local_using_sysemu ? -1 : __NR_getpid) < 0)
-                tracer_panic("do_syscall : Nullifying syscall failed, "
-                             "errno = %d", errno);
-}
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */