1 files changed, 170 insertions, 239 deletions

diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index e2d3ca445ef..016adf0985d 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -1,74 +1,67 @@
 /*
- * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  * Licensed under the GPL
  */
 
-#include "linux/config.h"
-#include "linux/kernel.h"
-#include "linux/sched.h"
-#include "linux/notifier.h"
-#include "linux/mm.h"
-#include "linux/types.h"
-#include "linux/tty.h"
-#include "linux/init.h"
-#include "linux/bootmem.h"
-#include "linux/spinlock.h"
-#include "linux/utsname.h"
-#include "linux/sysrq.h"
-#include "linux/seq_file.h"
-#include "linux/delay.h"
-#include "linux/module.h"
-#include "asm/page.h"
-#include "asm/pgtable.h"
-#include "asm/ptrace.h"
-#include "asm/elf.h"
-#include "asm/user.h"
-#include "asm/setup.h"
-#include "ubd_user.h"
-#include "asm/current.h"
-#include "user_util.h"
-#include "kern_util.h"
-#include "kern.h"
-#include "mem_user.h"
-#include "mem.h"
-#include "umid.h"
-#include "initrd.h"
-#include "init.h"
-#include "os.h"
-#include "choose-mode.h"
-#include "mode_kern.h"
-#include "mode.h"
-#ifdef UML_CONFIG_MODE_SKAS
-#include "skas.h"
-#endif
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/string.h>
+#include <linux/utsname.h>
+#include <linux/sched.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <as-layout.h>
+#include <arch.h>
+#include <init.h>
+#include <kern.h>
+#include <kern_util.h>
+#include <mem_user.h>
+#include <os.h>
 
 #define DEFAULT_COMMAND_LINE "root=98:0"
 
-/* Changed in linux_main and setup_arch, which run before SMP is started */
-static char command_line[COMMAND_LINE_SIZE] = { 0 };
+/* Changed in add_arg and setup_arch, which run before SMP is started */
+static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
 
-static void add_arg(char *arg)
+static void __init add_arg(char *arg)
 {
 	if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
 		printf("add_arg: Too many command line arguments!\n");
 		exit(1);
 	}
-	if(strlen(command_line) > 0)
+	if (strlen(command_line) > 0)
 		strcat(command_line, " ");
 	strcat(command_line, arg);
 }
 
-struct cpuinfo_um boot_cpu_data = { 
+/*
+ * These fields are initialized at boot time and not changed.
+ * XXX This structure is used only in the non-SMP case.  Maybe this
+ * should be moved to smp.c.
+ */
+struct cpuinfo_um boot_cpu_data = {
 	.loops_per_jiffy	= 0,
 	.ipi_pipe		= { -1, -1 }
 };
 
+union thread_union cpu0_irqstack
+	__attribute__((__section__(".data..init_irqstack"))) =
+		{ INIT_THREAD_INFO(init_task) };
+
 unsigned long thread_saved_pc(struct task_struct *task)
 {
-	return(os_process_pc(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas,
-					      task)));
+	/* FIXME: Need to look up userspace_pid by cpu */
+	return os_process_pc(userspace_pid[0]);
 }
 
+/* Changed in setup_arch, which is called in early boot */
+static char host_info[(__NEW_UTS_LEN + 1) * 5];
+
 static int show_cpuinfo(struct seq_file *m, void *v)
 {
 	int index = 0;
@@ -82,13 +75,13 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 	seq_printf(m, "processor\t: %d\n", index);
 	seq_printf(m, "vendor_id\t: User Mode Linux\n");
 	seq_printf(m, "model name\t: UML\n");
-	seq_printf(m, "mode\t\t: %s\n", CHOOSE_MODE("tt", "skas"));
+	seq_printf(m, "mode\t\t: skas\n");
 	seq_printf(m, "host\t\t: %s\n", host_info);
 	seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
 		   loops_per_jiffy/(500000/HZ),
 		   (loops_per_jiffy/(5000/HZ)) % 100);
 
-	return(0);
+	return 0;
 }
 
 static void *c_start(struct seq_file *m, loff_t *pos)
@@ -106,7 +99,7 @@ static void c_stop(struct seq_file *m, void *v)
 {
 }
 
-struct seq_operations cpuinfo_op = {
+const struct seq_operations cpuinfo_op = {
 	.start	= c_start,
 	.next	= c_next,
 	.stop	= c_stop,
@@ -114,60 +107,29 @@ struct seq_operations cpuinfo_op = {
 };
 
 /* Set in linux_main */
-unsigned long host_task_size;
-unsigned long task_size;
-
-unsigned long uml_start;
-
-/* Set in early boot */
 unsigned long uml_physmem;
-unsigned long uml_reserved;
+EXPORT_SYMBOL(uml_physmem);
+
+unsigned long uml_reserved; /* Also modified in mem_init */
 unsigned long start_vm;
 unsigned long end_vm;
-int ncpus = 1;
 
-#ifdef CONFIG_CMDLINE_ON_HOST
-/* Pointer set in linux_main, the array itself is private to each thread,
- * and changed at address space creation time so this poses no concurrency
- * problems.
- */
-static char *argv1_begin = NULL;
-static char *argv1_end = NULL;
-#endif
+/* Set in uml_ncpus_setup */
+int ncpus = 1;
 
 /* Set in early boot */
 static int have_root __initdata = 0;
-long long physmem_size = 32 * 1024 * 1024;
-
-void set_cmdline(char *cmd)
-{
-#ifdef CONFIG_CMDLINE_ON_HOST
-	char *umid, *ptr;
 
-	if(CHOOSE_MODE(honeypot, 0)) return;
-
-	umid = get_umid();
-	if(*umid != '\0'){
-		snprintf(argv1_begin, 
-			 (argv1_end - argv1_begin) * sizeof(*ptr), 
-			 "(%s) ", umid);
-		ptr = &argv1_begin[strlen(argv1_begin)];
-	}
-	else ptr = argv1_begin;
-
-	snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), "[%s]", cmd);
-	memset(argv1_begin + strlen(argv1_begin), '\0', 
-	       argv1_end - argv1_begin - strlen(argv1_begin));
-#endif
-}
+/* Set in uml_mem_setup and modified in linux_main */
+long long physmem_size = 32 * 1024 * 1024;
 
-static char *usage_string = 
+static const char *usage_string =
 "User Mode Linux v%s\n"
 "	available at http://user-mode-linux.sourceforge.net/\n\n";
 
 static int __init uml_version_setup(char *line, int *add)
 {
-	printf("%s\n", system_utsname.release);
+	printf("%s\n", init_utsname()->release);
 	exit(0);
 
 	return 0;
@@ -193,81 +155,47 @@ __uml_setup("root=", uml_root_setup,
 "        root=/dev/ubd5\n\n"
 );
 
-#ifdef CONFIG_SMP
-static int __init uml_ncpus_setup(char *line, int *add)
+static int __init no_skas_debug_setup(char *line, int *add)
 {
-       if (!sscanf(line, "%d", &ncpus)) {
-               printf("Couldn't parse [%s]\n", line);
-               return -1;
-       }
+	printf("'debug' is not necessary to gdb UML in skas mode - run \n");
+	printf("'gdb linux'\n");
 
-       return 0;
+	return 0;
 }
 
-__uml_setup("ncpus=", uml_ncpus_setup,
-"ncpus=<# of desired CPUs>\n"
-"    This tells an SMP kernel how many virtual processors to start.\n\n" 
+__uml_setup("debug", no_skas_debug_setup,
+"debug\n"
+"    this flag is not needed to run gdb on UML in skas mode\n\n"
 );
-#endif
-
-static int force_tt = 0;
-
-#if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS)
-#define DEFAULT_TT 0
-
-static int __init mode_tt_setup(char *line, int *add)
-{
-	force_tt = 1;
-	return(0);
-}
-
-#else
-#ifdef CONFIG_MODE_SKAS
-
-#define DEFAULT_TT 0
 
-static int __init mode_tt_setup(char *line, int *add)
+#ifdef CONFIG_SMP
+static int __init uml_ncpus_setup(char *line, int *add)
 {
-	printf("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n");
-	return(0);
-}
-
-#else
-#ifdef CONFIG_MODE_TT
-
-#define DEFAULT_TT 1
+	if (!sscanf(line, "%d", &ncpus)) {
+		printf("Couldn't parse [%s]\n", line);
+		return -1;
+	}
 
-static int __init mode_tt_setup(char *line, int *add)
-{
-	printf("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n");
-	return(0);
+	return 0;
 }
 
-#endif
-#endif
-#endif
-
-__uml_setup("mode=tt", mode_tt_setup,
-"mode=tt\n"
-"    When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n"
-"    forces UML to run in tt (tracing thread) mode.  It is not the default\n"
-"    because it's slower and less secure than skas mode.\n\n"
+__uml_setup("ncpus=", uml_ncpus_setup,
+"ncpus=<# of desired CPUs>\n"
+"    This tells an SMP kernel how many virtual processors to start.\n\n"
 );
-
-int mode_tt = DEFAULT_TT;
+#endif
 
 static int __init Usage(char *line, int *add)
 {
- 	const char **p;
-
-	printf(usage_string, system_utsname.release);
- 	p = &__uml_help_start;
- 	while (p < &__uml_help_end) {
- 		printf("%s", *p);
- 		p++;
- 	}
-	exit(0);
+	const char **p;
 
+	printf(usage_string, init_utsname()->release);
+	p = &__uml_help_start;
+	while (p < &__uml_help_end) {
+		printf("%s", *p);
+		p++;
+	}
+	exit(0);
 	return 0;
 }
 
@@ -276,21 +204,19 @@ __uml_setup("--help", Usage,
 "    Prints this message.\n\n"
 );
 
-static int __init uml_checksetup(char *line, int *add)
+static void __init uml_checksetup(char *line, int *add)
 {
 	struct uml_param *p;
 
 	p = &__uml_setup_start;
-	while(p < &__uml_setup_end) {
-		int n;
+	while (p < &__uml_setup_end) {
+		size_t n;
 
 		n = strlen(p->str);
-		if(!strncmp(line, p->str, n)){
-			if (p->setup_func(line + n, add)) return 1;
-		}
+		if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
+			return;
 		p++;
 	}
-	return 0;
 }
 
 static void __init uml_postsetup(void)
@@ -298,112 +224,120 @@ static void __init uml_postsetup(void)
 	initcall_t *p;
 
 	p = &__uml_postsetup_start;
-	while(p < &__uml_postsetup_end){
+	while (p < &__uml_postsetup_end) {
 		(*p)();
 		p++;
 	}
 	return;
 }
 
+static int panic_exit(struct notifier_block *self, unsigned long unused1,
+		      void *unused2)
+{
+	bust_spinlocks(1);
+	bust_spinlocks(0);
+	uml_exitcode = 1;
+	os_dump_core();
+	return 0;
+}
+
+static struct notifier_block panic_exit_notifier = {
+	.notifier_call 		= panic_exit,
+	.next 			= NULL,
+	.priority 		= 0
+};
+
 /* Set during early boot */
+unsigned long task_size;
+EXPORT_SYMBOL(task_size);
+
+unsigned long host_task_size;
+
 unsigned long brk_start;
 unsigned long end_iomem;
 EXPORT_SYMBOL(end_iomem);
 
 #define MIN_VMALLOC (32 * 1024 * 1024)
 
-int linux_main(int argc, char **argv)
+extern char __binary_start;
+
+int __init linux_main(int argc, char **argv)
 {
 	unsigned long avail, diff;
 	unsigned long virtmem_size, max_physmem;
-	unsigned int i, add;
+	unsigned long stack;
+	unsigned int i;
+	int add;
 	char * mode;
 
-	for (i = 1; i < argc; i++){
-		if((i == 1) && (argv[i][0] == ' ')) continue;
+	for (i = 1; i < argc; i++) {
+		if ((i == 1) && (argv[i][0] == ' '))
+			continue;
 		add = 1;
 		uml_checksetup(argv[i], &add);
 		if (add)
 			add_arg(argv[i]);
 	}
-	if(have_root == 0)
+	if (have_root == 0)
 		add_arg(DEFAULT_COMMAND_LINE);
 
+	host_task_size = os_get_top_address();
+	/*
+	 * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps
+	 * out
+	 */
+	task_size = host_task_size & PGDIR_MASK;
+
+	/* OS sanity checks that need to happen before the kernel runs */
 	os_early_checks();
-	if (force_tt)
-		clear_can_do_skas();
-	mode_tt = force_tt ? 1 : !can_do_skas();
-#ifndef CONFIG_MODE_TT
-	if (mode_tt) {
-		/*Since CONFIG_MODE_TT is #undef'ed, force_tt cannot be 1. So,
-		 * can_do_skas() returned 0, and the message is correct. */
-		printf("Support for TT mode is disabled, and no SKAS support is present on the host.\n");
-		exit(1);
-	}
-#endif
 
-#ifndef CONFIG_MODE_SKAS
-	mode = "TT";
-#else
-	/* Show to the user the result of selection */
-	if (mode_tt)
-		mode = "TT";
-	else if (proc_mm && ptrace_faultinfo)
+	can_do_skas();
+
+	if (proc_mm && ptrace_faultinfo)
 		mode = "SKAS3";
 	else
 		mode = "SKAS0";
-#endif
 
 	printf("UML running in %s mode\n", mode);
 
-	uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas, 0,
-				     &host_task_size, &task_size);
+	brk_start = (unsigned long) sbrk(0);
 
 	/*
- 	 * Setting up handlers to 'sig_info' struct
- 	 */
-	os_fill_handlinfo(handlinfo_kern);
-
-	brk_start = (unsigned long) sbrk(0);
-	CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start);
-	/* Increase physical memory size for exec-shield users
-	so they actually get what they asked for. This should
-	add zero for non-exec shield users */
+	 * Increase physical memory size for exec-shield users
+	 * so they actually get what they asked for. This should
+	 * add zero for non-exec shield users
+	 */
 
 	diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
-	if(diff > 1024 * 1024){
+	if (diff > 1024 * 1024) {
 		printf("Adding %ld bytes to physical memory to account for "
 		       "exec-shield gap\n", diff);
 		physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
 	}
 
-	uml_physmem = uml_start;
+	uml_physmem = (unsigned long) &__binary_start & PAGE_MASK;
 
 	/* Reserve up to 4M after the current brk */
 	uml_reserved = ROUND_4M(brk_start) + (1 << 22);
 
-	setup_machinename(system_utsname.machine);
+	setup_machinename(init_utsname()->machine);
 
-#ifdef CONFIG_CMDLINE_ON_HOST
-	argv1_begin = argv[1];
-	argv1_end = &argv[1][strlen(argv[1])];
-#endif
-  
 	highmem = 0;
 	iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
-	max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;
+	max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
 
-	/* Zones have to begin on a 1 << MAX_ORDER page boundary,
+	/*
+	 * Zones have to begin on a 1 << MAX_ORDER page boundary,
 	 * so this makes sure that's true for highmem
 	 */
 	max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
-	if(physmem_size + iomem_size > max_physmem){
+	if (physmem_size + iomem_size > max_physmem) {
 		highmem = physmem_size + iomem_size - max_physmem;
 		physmem_size -= highmem;
 #ifndef CONFIG_HIGHMEM
 		highmem = 0;
 		printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
-		       "to %lu bytes\n", physmem_size);
+		       "to %Lu bytes\n", physmem_size);
 #endif
 	}
 
@@ -414,65 +348,62 @@ int linux_main(int argc, char **argv)
 	start_vm = VMALLOC_START;
 
 	setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
-	if(init_maps(physmem_size, iomem_size, highmem)){
-		printf("Failed to allocate mem_map for %lu bytes of physical "
-		       "memory and %lu bytes of highmem\n", physmem_size,
+	if (init_maps(physmem_size, iomem_size, highmem)) {
+		printf("Failed to allocate mem_map for %Lu bytes of physical "
+		       "memory and %Lu bytes of highmem\n", physmem_size,
 		       highmem);
 		exit(1);
 	}
 
 	virtmem_size = physmem_size;
-	avail = get_kmem_end() - start_vm;
-	if(physmem_size > avail) virtmem_size = avail;
+	stack = (unsigned long) argv;
+	stack &= ~(1024 * 1024 - 1);
+	avail = stack - start_vm;
+	if (physmem_size > avail)
+		virtmem_size = avail;
 	end_vm = start_vm + virtmem_size;
 
-	if(virtmem_size < physmem_size)
+	if (virtmem_size < physmem_size)
 		printf("Kernel virtual memory size shrunk to %lu bytes\n",
 		       virtmem_size);
 
-  	uml_postsetup();
-
-	task_protections((unsigned long) &init_thread_info);
-	os_flush_stdout();
+	atomic_notifier_chain_register(&panic_notifier_list,
+				       &panic_exit_notifier);
 
-	return(CHOOSE_MODE(start_uml_tt(), start_uml_skas()));
-}
+	uml_postsetup();
 
-extern int uml_exitcode;
+	stack_protections((unsigned long) &init_thread_info);
+	os_flush_stdout();
 
-static int panic_exit(struct notifier_block *self, unsigned long unused1,
-		      void *unused2)
-{
-	bust_spinlocks(1);
-	show_regs(&(current->thread.regs));
-	bust_spinlocks(0);
-	uml_exitcode = 1;
-	machine_halt();
-	return(0);
+	return start_uml();
 }
 
-static struct notifier_block panic_exit_notifier = {
-	.notifier_call 		= panic_exit,
-	.next 			= NULL,
-	.priority 		= 0
-};
-
 void __init setup_arch(char **cmdline_p)
 {
-	notifier_chain_register(&panic_notifier_list, &panic_exit_notifier);
 	paging_init();
-        strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
- 	*cmdline_p = command_line;
-	setup_hostinfo();
+	strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
+	*cmdline_p = command_line;
+	setup_hostinfo(host_info, sizeof host_info);
 }
 
 void __init check_bugs(void)
 {
 	arch_check_bugs();
-	check_sigio();
-	check_devanon();
+	os_check_bugs();
+}
+
+void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
+{
 }
 
-void apply_alternatives(void *start, void *end)
+#ifdef CONFIG_SMP
+void alternatives_smp_module_add(struct module *mod, char *name,
+				 void *locks, void *locks_end,
+				 void *text,  void *text_end)
 {
 }
+
+void alternatives_smp_module_del(struct module *mod)
+{
+}
+#endif