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, 280 deletions

diff --git a/arch/um/kernel/tt/gdb.c b/arch/um/kernel/tt/gdb.c
deleted file mode 100644
index 030e4658f36..00000000000
--- a/arch/um/kernel/tt/gdb.c
+++ /dev/null
@@ -1,280 +0,0 @@
-/* 
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <string.h>
-#include <signal.h>
-#include <sys/types.h>
-#include "ptrace_user.h"
-#include "uml-config.h"
-#include "kern_constants.h"
-#include "chan_user.h"
-#include "init.h"
-#include "user.h"
-#include "debug.h"
-#include "kern_util.h"
-#include "tt.h"
-#include "sysdep/thread.h"
-#include "os.h"
-
-extern int debugger_pid;
-extern int debugger_fd;
-extern int debugger_parent;
-
-int detach(int pid, int sig)
-{
-	return(ptrace(PTRACE_DETACH, pid, 0, sig));
-}
-
-int attach(int pid)
-{
-	int err;
-
-	err = ptrace(PTRACE_ATTACH, pid, 0, 0);
-	if(err < 0) return(-errno);
-	else return(err);
-}
-
-int cont(int pid)
-{
-	return(ptrace(PTRACE_CONT, pid, 0, 0));
-}
-
-#ifdef UML_CONFIG_PT_PROXY
-
-int debugger_signal(int status, pid_t pid)
-{
-	return(debugger_proxy(status, pid));
-}
-
-void child_signal(pid_t pid, int status)
-{
-	child_proxy(pid, status);
-}
-
-static void gdb_announce(char *dev_name, int dev)
-{
-	printf("gdb assigned device '%s'\n", dev_name);
-}
-
-static struct chan_opts opts = {
-	.announce  	= gdb_announce,
-	.xterm_title 	= "UML kernel debugger",
-	.raw 		= 0,
-	.tramp_stack 	= 0,
-	.in_kernel  	= 0,
-};
-
-/* Accessed by the tracing thread, which automatically serializes access */
-static void *xterm_data;
-static int xterm_fd;
-
-extern void *xterm_init(char *, int, struct chan_opts *);
-extern int xterm_open(int, int, int, void *, char **);
-extern void xterm_close(int, void *);
-
-int open_gdb_chan(void)
-{
-	char stack[UM_KERN_PAGE_SIZE], *dummy;
-
-	opts.tramp_stack = (unsigned long) stack;
-	xterm_data = xterm_init("", 0, &opts);
-	xterm_fd = xterm_open(1, 1, 1, xterm_data, &dummy);
-	return(xterm_fd);
-}
-
-static void exit_debugger_cb(void *unused)
-{
-	if(debugger_pid != -1){
-		if(gdb_pid != -1){
-			fake_child_exit();
-			gdb_pid = -1;
-		}
-		else kill_child_dead(debugger_pid);
-		debugger_pid = -1;
-		if(debugger_parent != -1)
-			detach(debugger_parent, SIGINT);
-	}
-	if(xterm_data != NULL) xterm_close(xterm_fd, xterm_data);
-}
-
-static void exit_debugger(void)
-{
-	initial_thread_cb(exit_debugger_cb, NULL);
-}
-
-__uml_exitcall(exit_debugger);
-
-struct gdb_data {
-	char *str;
-	int err;
-};
-
-extern char *linux_prog;
-
-static void config_gdb_cb(void *arg)
-{
-	struct gdb_data *data = arg;
-	void *task;
-	int pid;
-
-	data->err = -1;
-	if(debugger_pid != -1) exit_debugger_cb(NULL);
-	if(!strncmp(data->str, "pid,", strlen("pid,"))){
-		data->str += strlen("pid,");
-		pid = strtoul(data->str, NULL, 0);
-		task = cpu_tasks[0].task;
-		debugger_pid = attach_debugger(TASK_EXTERN_PID(task), pid, 0);
-		if(debugger_pid != -1){
-			data->err = 0;
-			gdb_pid = pid;
-		}
-		return;
-	}
-	data->err = 0;
-	debugger_pid = start_debugger(linux_prog, 0, 0, &debugger_fd);
-	init_proxy(debugger_pid, 0, 0);
-}
-
-int gdb_config(char *str, char **error_out)
-{
-	struct gdb_data data;
-
-	if(*str++ != '=') return(-1);
-	data.str = str;
-	initial_thread_cb(config_gdb_cb, &data);
-	return(data.err);
-}
-
-void remove_gdb_cb(void *unused)
-{
-	exit_debugger_cb(NULL);
-}
-
-int gdb_remove(int unused, char **error_out)
-{
-	initial_thread_cb(remove_gdb_cb, NULL);
-        return 0;
-}
-
-void signal_usr1(int sig)
-{
-	if(debugger_pid != -1){
-		printf("The debugger is already running\n");
-		return;
-	}
-	debugger_pid = start_debugger(linux_prog, 0, 0, &debugger_fd);
-	init_proxy(debugger_pid, 0, 0);
-}
-
-int init_ptrace_proxy(int idle_pid, int startup, int stop)
-{
-	int pid, status;
-
-	pid = start_debugger(linux_prog, startup, stop, &debugger_fd);
-	status = wait_for_stop(idle_pid, SIGSTOP, PTRACE_CONT, NULL);
- 	if(pid < 0){
-		cont(idle_pid);
-		return(-1);
-	}
-	init_proxy(pid, 1, status);
-	return(pid);
-}
-
-int attach_debugger(int idle_pid, int pid, int stop)
-{
-	int status = 0, err;
-
-	err = attach(pid);
-	if(err < 0){
-		printf("Failed to attach pid %d, errno = %d\n", pid, -err);
-		return(-1);
-	}
-	if(stop) status = wait_for_stop(idle_pid, SIGSTOP, PTRACE_CONT, NULL);
-	init_proxy(pid, 1, status);
-	return(pid);
-}
-
-#ifdef notdef /* Put this back in when it does something useful */
-static int __init uml_gdb_init_setup(char *line, int *add)
-{
-	gdb_init = uml_strdup(line);
-	return 0;
-}
-
-__uml_setup("gdb=", uml_gdb_init_setup, 
-"gdb=<channel description>\n\n"
-);
-#endif
-
-static int __init uml_gdb_pid_setup(char *line, int *add)
-{
-	gdb_pid = strtoul(line, NULL, 0);
-	*add = 0;
-	return 0;
-}
-
-__uml_setup("gdb-pid=", uml_gdb_pid_setup, 
-"gdb-pid=<pid>\n"
-"    gdb-pid is used to attach an external debugger to UML.  This may be\n"
-"    an already-running gdb or a debugger-like process like strace.\n\n"
-);
-
-#else
-
-int debugger_signal(int status, pid_t pid){ return(0); }
-void child_signal(pid_t pid, int status){ }
-int init_ptrace_proxy(int idle_pid, int startup, int stop)
-{
-	printf("debug requested when CONFIG_PT_PROXY is off\n");
-	kill_child_dead(idle_pid);
-	exit(1);
-}
-
-void signal_usr1(int sig)
-{
-	printf("debug requested when CONFIG_PT_PROXY is off\n");
-}
-
-int attach_debugger(int idle_pid, int pid, int stop)
-{
-	printf("attach_debugger called when CONFIG_PT_PROXY "
-	       "is off\n");
-	return(-1);
-}
-
-int config_gdb(char *str)
-{
-	return(-1);
-}
-
-int remove_gdb(void)
-{
-	return(-1);
-}
-
-int init_parent_proxy(int pid)
-{
-	return(-1);
-}
-
-void debugger_parent_signal(int status, int pid)
-{
-}
-
-#endif
-
-/*
- * 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:
- */