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, 377 deletions

diff --git a/arch/um/kernel/tt/ptproxy/proxy.c b/arch/um/kernel/tt/ptproxy/proxy.c
deleted file mode 100644
index 420c23f311f..00000000000
--- a/arch/um/kernel/tt/ptproxy/proxy.c
+++ /dev/null
@@ -1,377 +0,0 @@
-/**********************************************************************
-proxy.c
-
-Copyright (C) 1999 Lars Brinkhoff.  See the file COPYING for licensing
-terms and conditions.
-
-Jeff Dike (jdike@karaya.com) : Modified for integration into uml
-**********************************************************************/
-
-/* XXX This file shouldn't refer to CONFIG_* */
-
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <signal.h>
-#include <string.h>
-#include <termios.h>
-#include <sys/wait.h>
-#include <sys/types.h>
-#include <sys/ioctl.h>
-#include <asm/unistd.h>
-#include "ptrace_user.h"
-
-#include "ptproxy.h"
-#include "sysdep.h"
-#include "wait.h"
-
-#include "user.h"
-#include "os.h"
-#include "tempfile.h"
-
-static int debugger_wait(debugger_state *debugger, int *status, int options,
-			 int (*syscall)(debugger_state *debugger, pid_t child),
-			 int (*normal_return)(debugger_state *debugger, 
-					      pid_t unused),
-			 int (*wait_return)(debugger_state *debugger, 
-					    pid_t unused))
-{
-	if(debugger->real_wait){
-		debugger->handle_trace = normal_return;
-		syscall_continue(debugger->pid);
-		debugger->real_wait = 0;
-		return(1);
-	}
-	debugger->wait_status_ptr = status;
-	debugger->wait_options = options;
-	if((debugger->debugee != NULL) && debugger->debugee->event){
-		syscall_continue(debugger->pid);
-		wait_for_stop(debugger->pid, SIGTRAP, PTRACE_SYSCALL,
-			      NULL);
-		(*wait_return)(debugger, -1);
-		return(0);
-	}
-	else if(debugger->wait_options & WNOHANG){
-		syscall_cancel(debugger->pid, 0);
-		debugger->handle_trace = syscall;
-		return(0);
-	}
-	else {
-		syscall_pause(debugger->pid);
-		debugger->handle_trace = wait_return;
-		debugger->waiting = 1;
-	}
-	return(1);
-}
-
-/*
- * Handle debugger trap, i.e. syscall.
- */
-
-int debugger_syscall(debugger_state *debugger, pid_t child)
-{
-	long arg1, arg2, arg3, arg4, arg5, result;
-	int syscall, ret = 0;
-
-	syscall = get_syscall(debugger->pid, &arg1, &arg2, &arg3, &arg4, 
-			      &arg5);
-
-	switch(syscall){
-	case __NR_execve:
-		/* execve never returns */
-		debugger->handle_trace = debugger_syscall; 
-		break;
-
-	case __NR_ptrace:
-		if(debugger->debugee->pid != 0) arg2 = debugger->debugee->pid;
-		if(!debugger->debugee->in_context) 
-			child = debugger->debugee->pid;
-		result = proxy_ptrace(debugger, arg1, arg2, arg3, arg4, child,
-				      &ret);
-		syscall_cancel(debugger->pid, result);
-		debugger->handle_trace = debugger_syscall;
-		return(ret);
-
-#ifdef __NR_waitpid
-	case __NR_waitpid:
-#endif
-	case __NR_wait4:
-		if(!debugger_wait(debugger, (int *) arg2, arg3, 
-				  debugger_syscall, debugger_normal_return, 
-				  proxy_wait_return))
-			return(0);
-		break;
-
-	case __NR_kill:
-		if(!debugger->debugee->in_context) 
-			child = debugger->debugee->pid;
-		if(arg1 == debugger->debugee->pid){
-			result = kill(child, arg2);
-			syscall_cancel(debugger->pid, result);
-			debugger->handle_trace = debugger_syscall;
-			return(0);
-		}
-		else debugger->handle_trace = debugger_normal_return;
-		break;
-
-	default:
-		debugger->handle_trace = debugger_normal_return;
-	}
-
-	syscall_continue(debugger->pid);
-	return(0);
-}
-
-/* Used by the tracing thread */
-static debugger_state parent;
-static int parent_syscall(debugger_state *debugger, int pid);
-
-int init_parent_proxy(int pid)
-{
-	parent = ((debugger_state) { .pid 		= pid,
-				     .wait_options 	= 0,
-				     .wait_status_ptr 	= NULL,
-				     .waiting 		= 0,
-				     .real_wait 	= 0,
-				     .expecting_child 	= 0,
-				     .handle_trace  	= parent_syscall,
-				     .debugee 		= NULL } );
-	return(0);
-}
-
-int parent_normal_return(debugger_state *debugger, pid_t unused)
-{
-	debugger->handle_trace = parent_syscall;
-	syscall_continue(debugger->pid);
-	return(0);
-}
-
-static int parent_syscall(debugger_state *debugger, int pid)
-{
-	long arg1, arg2, arg3, arg4, arg5;
-	int syscall;
-
-	syscall = get_syscall(pid, &arg1, &arg2, &arg3, &arg4, &arg5);
-		
-	if((syscall == __NR_wait4)
-#ifdef __NR_waitpid
-	   || (syscall == __NR_waitpid)
-#endif
-	){
-		debugger_wait(&parent, (int *) arg2, arg3, parent_syscall,
-			      parent_normal_return, parent_wait_return);
-	}
-	else ptrace(PTRACE_SYSCALL, pid, 0, 0);
-	return(0);
-}
-
-int debugger_normal_return(debugger_state *debugger, pid_t unused)
-{
-	debugger->handle_trace = debugger_syscall;
-	syscall_continue(debugger->pid);
-	return(0);
-}
-
-void debugger_cancelled_return(debugger_state *debugger, int result)
-{
-	debugger->handle_trace = debugger_syscall;
-	syscall_set_result(debugger->pid, result);
-	syscall_continue(debugger->pid);
-}
-
-/* Used by the tracing thread */
-static debugger_state debugger;
-static debugee_state debugee;
-
-void init_proxy (pid_t debugger_pid, int stopped, int status)
-{
-	debugger.pid = debugger_pid;
-	debugger.handle_trace = debugger_syscall;
-	debugger.debugee = &debugee;
-	debugger.waiting = 0;
-	debugger.real_wait = 0;
-	debugger.expecting_child = 0;
-
-	debugee.pid = 0;
-	debugee.traced = 0;
-	debugee.stopped = stopped;
-	debugee.event = 0;
-	debugee.zombie = 0;
-	debugee.died = 0;
-	debugee.wait_status = status;
-	debugee.in_context = 1;
-}
-
-int debugger_proxy(int status, int pid)
-{
-	int ret = 0, sig;
-
-	if(WIFSTOPPED(status)){
-		sig = WSTOPSIG(status);
-		if (sig == SIGTRAP)
-			ret = (*debugger.handle_trace)(&debugger, pid);
-						       
-		else if(sig == SIGCHLD){
-			if(debugger.expecting_child){
-				ptrace(PTRACE_SYSCALL, debugger.pid, 0, sig);
-				debugger.expecting_child = 0;
-			}
-			else if(debugger.waiting)
-				real_wait_return(&debugger);
-			else {
-				ptrace(PTRACE_SYSCALL, debugger.pid, 0, sig);
-				debugger.real_wait = 1;
-			}
-		}
-		else ptrace(PTRACE_SYSCALL, debugger.pid, 0, sig);
-	}
-	else if(WIFEXITED(status)){
-		tracer_panic("debugger (pid %d) exited with status %d", 
-			     debugger.pid, WEXITSTATUS(status));
-	}
-	else if(WIFSIGNALED(status)){
-		tracer_panic("debugger (pid %d) exited with signal %d", 
-			     debugger.pid, WTERMSIG(status));
-	}
-	else {
-		tracer_panic("proxy got unknown status (0x%x) on debugger "
-			     "(pid %d)", status, debugger.pid);
-	}
-	return(ret);
-}
-
-void child_proxy(pid_t pid, int status)
-{
-	debugee.event = 1;
-	debugee.wait_status = status;
-
-	if(WIFSTOPPED(status)){
-		debugee.stopped = 1;
-		debugger.expecting_child = 1;
-		kill(debugger.pid, SIGCHLD);
-	}
-	else if(WIFEXITED(status) || WIFSIGNALED(status)){
-		debugee.zombie = 1;
-		debugger.expecting_child = 1;
-		kill(debugger.pid, SIGCHLD);
-	}
-	else panic("proxy got unknown status (0x%x) on child (pid %d)", 
-		   status, pid);
-}
-
-void debugger_parent_signal(int status, int pid)
-{
-	int sig;
-
-	if(WIFSTOPPED(status)){
-		sig = WSTOPSIG(status);
-		if(sig == SIGTRAP) (*parent.handle_trace)(&parent, pid);
-		else ptrace(PTRACE_SYSCALL, pid, 0, sig);
-	}
-}
-
-void fake_child_exit(void)
-{
-	int status, pid;
-
-	child_proxy(1, W_EXITCODE(0, 0));
-	while(debugger.waiting == 1){
-		CATCH_EINTR(pid = waitpid(debugger.pid, &status, WUNTRACED));
-		if(pid != debugger.pid){
-			printk("fake_child_exit - waitpid failed, "
-			       "errno = %d\n", errno);
-			return;
-		}
-		debugger_proxy(status, debugger.pid);
-	}
-	CATCH_EINTR(pid = waitpid(debugger.pid, &status, WUNTRACED));
-	if(pid != debugger.pid){
-		printk("fake_child_exit - waitpid failed, "
-		       "errno = %d\n", errno);
-		return;
-	}
-	if(ptrace(PTRACE_DETACH, debugger.pid, 0, SIGCONT) < 0)
-		printk("fake_child_exit - PTRACE_DETACH failed, errno = %d\n",
-		       errno);
-}
-
-char gdb_init_string[] = 
-"att 1 \n\
-b panic \n\
-b stop \n\
-handle SIGWINCH nostop noprint pass \n\
-";
-
-int start_debugger(char *prog, int startup, int stop, int *fd_out)
-{
-	int slave, child;
-
-	slave = open_gdb_chan();
-	child = fork();
-	if(child == 0){
-		char *tempname = NULL;
-		int fd;
-
-	        if(setsid() < 0) perror("setsid");
-		if((dup2(slave, 0) < 0) || (dup2(slave, 1) < 0) || 
-		   (dup2(slave, 2) < 0)){
-			printk("start_debugger : dup2 failed, errno = %d\n",
-			       errno);
-			exit(1);
-		}
-		if(ioctl(0, TIOCSCTTY, 0) < 0){
-			printk("start_debugger : TIOCSCTTY failed, "
-			       "errno = %d\n", errno);
-			exit(1);
-		}
-		if(tcsetpgrp (1, os_getpid()) < 0){
-			printk("start_debugger : tcsetpgrp failed, "
-			       "errno = %d\n", errno);
-#ifdef notdef
-			exit(1);
-#endif
-		}
-		fd = make_tempfile("/tmp/gdb_init-XXXXXX", &tempname, 0);
-		if(fd < 0){
-			printk("start_debugger : make_tempfile failed,"
-			       "err = %d\n", -fd);
-			exit(1);
-		}
-		os_write_file(fd, gdb_init_string,
-			      sizeof(gdb_init_string) - 1);
-		if(startup){
-			if(stop){
-				os_write_file(fd, "b start_kernel\n",
-						strlen("b start_kernel\n"));
-			}
-			os_write_file(fd, "c\n", strlen("c\n"));
-		}
-		if(ptrace(PTRACE_TRACEME, 0, 0, 0) < 0){
-			printk("start_debugger :  PTRACE_TRACEME failed, "
-			       "errno = %d\n", errno);
-			exit(1);
-		}
-		execlp("gdb", "gdb", "--command", tempname, prog, NULL);
-		printk("start_debugger : exec of gdb failed, errno = %d\n",
-		       errno);
-	}
-	if(child < 0){
-		printk("start_debugger : fork for gdb failed, errno = %d\n",
-		       errno);
-		return(-1);
-	}
-	*fd_out = slave;
-	return(child);
-}
-
-/*
- * 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:
- */