Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 423 insertions, 0 deletions

diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
new file mode 100644
index 00000000000..f76a2692adc
--- /dev/null
+++ b/arch/um/kernel/process.c
@@ -0,0 +1,423 @@
+/* 
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sched.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <setjmp.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+#include <sys/mman.h>
+#include <asm/unistd.h>
+#include <asm/page.h>
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "process.h"
+#include "signal_kern.h"
+#include "signal_user.h"
+#include "sysdep/ptrace.h"
+#include "sysdep/sigcontext.h"
+#include "irq_user.h"
+#include "ptrace_user.h"
+#include "time_user.h"
+#include "init.h"
+#include "os.h"
+#include "uml-config.h"
+#include "ptrace_user.h"
+#include "choose-mode.h"
+#include "mode.h"
+#ifdef UML_CONFIG_MODE_SKAS
+#include "skas.h"
+#include "skas_ptrace.h"
+#include "registers.h"
+#endif
+
+void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int))
+{
+	int flags = 0, pages;
+
+	if(sig_stack != NULL){
+		pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER);
+		set_sigstack(sig_stack, pages * page_size());
+		flags = SA_ONSTACK;
+	}
+	if(usr1_handler) set_handler(SIGUSR1, usr1_handler, flags, -1);
+}
+
+void init_new_thread_signals(int altstack)
+{
+	int flags = altstack ? SA_ONSTACK : 0;
+
+	set_handler(SIGSEGV, (__sighandler_t) sig_handler, flags,
+		    SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+	set_handler(SIGTRAP, (__sighandler_t) sig_handler, flags, 
+		    SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+	set_handler(SIGFPE, (__sighandler_t) sig_handler, flags, 
+		    SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+	set_handler(SIGILL, (__sighandler_t) sig_handler, flags, 
+		    SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+	set_handler(SIGBUS, (__sighandler_t) sig_handler, flags, 
+		    SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+	set_handler(SIGWINCH, (__sighandler_t) sig_handler, flags, 
+		    SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+	set_handler(SIGUSR2, (__sighandler_t) sig_handler, 
+		    flags, SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+	signal(SIGHUP, SIG_IGN);
+
+	init_irq_signals(altstack);
+}
+
+struct tramp {
+	int (*tramp)(void *);
+	void *tramp_data;
+	unsigned long temp_stack;
+	int flags;
+	int pid;
+};
+
+/* See above for why sigkill is here */
+
+int sigkill = SIGKILL;
+
+int outer_tramp(void *arg)
+{
+	struct tramp *t;
+	int sig = sigkill;
+
+	t = arg;
+	t->pid = clone(t->tramp, (void *) t->temp_stack + page_size()/2,
+		       t->flags, t->tramp_data);
+	if(t->pid > 0) wait_for_stop(t->pid, SIGSTOP, PTRACE_CONT, NULL);
+	kill(os_getpid(), sig);
+	_exit(0);
+}
+
+int start_fork_tramp(void *thread_arg, unsigned long temp_stack, 
+		     int clone_flags, int (*tramp)(void *))
+{
+	struct tramp arg;
+	unsigned long sp;
+	int new_pid, status, err;
+
+	/* The trampoline will run on the temporary stack */
+	sp = stack_sp(temp_stack);
+
+	clone_flags |= CLONE_FILES | SIGCHLD;
+
+	arg.tramp = tramp;
+	arg.tramp_data = thread_arg;
+	arg.temp_stack = temp_stack;
+	arg.flags = clone_flags;
+
+	/* Start the process and wait for it to kill itself */
+	new_pid = clone(outer_tramp, (void *) sp, clone_flags, &arg);
+	if(new_pid < 0)
+		return(new_pid);
+
+	CATCH_EINTR(err = waitpid(new_pid, &status, 0));
+	if(err < 0)
+		panic("Waiting for outer trampoline failed - errno = %d",
+		      errno);
+
+	if(!WIFSIGNALED(status) || (WTERMSIG(status) != SIGKILL))
+		panic("outer trampoline didn't exit with SIGKILL, "
+		      "status = %d", status);
+
+	return(arg.pid);
+}
+
+static int ptrace_child(void *arg)
+{
+	int ret;
+	int pid = os_getpid(), ppid = getppid();
+	int sc_result;
+
+	if(ptrace(PTRACE_TRACEME, 0, 0, 0) < 0){
+		perror("ptrace");
+		os_kill_process(pid, 0);
+	}
+	os_stop_process(pid);
+
+	/*This syscall will be intercepted by the parent. Don't call more than
+	 * once, please.*/
+	sc_result = os_getpid();
+
+	if (sc_result == pid)
+		ret = 1; /*Nothing modified by the parent, we are running
+			   normally.*/
+	else if (sc_result == ppid)
+		ret = 0; /*Expected in check_ptrace and check_sysemu when they
+			   succeed in modifying the stack frame*/
+	else
+		ret = 2; /*Serious trouble! This could be caused by a bug in
+			   host 2.6 SKAS3/2.6 patch before release -V6, together
+			   with a bug in the UML code itself.*/
+	_exit(ret);
+}
+
+static int start_ptraced_child(void **stack_out)
+{
+	void *stack;
+	unsigned long sp;
+	int pid, n, status;
+	
+	stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
+		     MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+	if(stack == MAP_FAILED)
+		panic("check_ptrace : mmap failed, errno = %d", errno);
+	sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *);
+	pid = clone(ptrace_child, (void *) sp, SIGCHLD, NULL);
+	if(pid < 0)
+		panic("check_ptrace : clone failed, errno = %d", errno);
+	CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
+	if(n < 0)
+		panic("check_ptrace : wait failed, errno = %d", errno);
+	if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP))
+		panic("check_ptrace : expected SIGSTOP, got status = %d",
+		      status);
+
+	*stack_out = stack;
+	return(pid);
+}
+
+/* When testing for SYSEMU support, if it is one of the broken versions, we must
+ * just avoid using sysemu, not panic, but only if SYSEMU features are broken.
+ * So only for SYSEMU features we test mustpanic, while normal host features
+ * must work anyway!*/
+static int stop_ptraced_child(int pid, void *stack, int exitcode, int mustpanic)
+{
+	int status, n, ret = 0;
+
+	if(ptrace(PTRACE_CONT, pid, 0, 0) < 0)
+		panic("check_ptrace : ptrace failed, errno = %d", errno);
+	CATCH_EINTR(n = waitpid(pid, &status, 0));
+	if(!WIFEXITED(status) || (WEXITSTATUS(status) != exitcode)) {
+		int exit_with = WEXITSTATUS(status);
+		if (exit_with == 2)
+			printk("check_ptrace : child exited with status 2. "
+			       "Serious trouble happening! Try updating your "
+			       "host skas patch!\nDisabling SYSEMU support.");
+		printk("check_ptrace : child exited with exitcode %d, while "
+		      "expecting %d; status 0x%x", exit_with,
+		      exitcode, status);
+		if (mustpanic)
+			panic("\n");
+		else
+			printk("\n");
+		ret = -1;
+	}
+
+	if(munmap(stack, PAGE_SIZE) < 0)
+		panic("check_ptrace : munmap failed, errno = %d", errno);
+	return ret;
+}
+
+static int force_sysemu_disabled = 0;
+
+static int __init nosysemu_cmd_param(char *str, int* add)
+{
+	force_sysemu_disabled = 1;
+	return 0;
+}
+
+__uml_setup("nosysemu", nosysemu_cmd_param,
+		"nosysemu\n"
+		"    Turns off syscall emulation patch for ptrace (SYSEMU) on.\n"
+		"    SYSEMU is a performance-patch introduced by Laurent Vivier. It changes\n"
+		"    behaviour of ptrace() and helps reducing host context switch rate.\n"
+		"    To make it working, you need a kernel patch for your host, too.\n"
+		"    See http://perso.wanadoo.fr/laurent.vivier/UML/ for further information.\n\n");
+
+static void __init check_sysemu(void)
+{
+	void *stack;
+	int pid, syscall, n, status, count=0;
+
+	printk("Checking syscall emulation patch for ptrace...");
+	sysemu_supported = 0;
+	pid = start_ptraced_child(&stack);
+
+	if(ptrace(PTRACE_SYSEMU, pid, 0, 0) < 0)
+		goto fail;
+
+	CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
+	if (n < 0)
+		panic("check_sysemu : wait failed, errno = %d", errno);
+	if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP))
+		panic("check_sysemu : expected SIGTRAP, "
+		      "got status = %d", status);
+
+	n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET,
+		   os_getpid());
+	if(n < 0)
+		panic("check_sysemu : failed to modify system "
+		      "call return, errno = %d", errno);
+
+	if (stop_ptraced_child(pid, stack, 0, 0) < 0)
+		goto fail_stopped;
+
+	sysemu_supported = 1;
+	printk("OK\n");
+	set_using_sysemu(!force_sysemu_disabled);
+
+	printk("Checking advanced syscall emulation patch for ptrace...");
+	pid = start_ptraced_child(&stack);
+	while(1){
+		count++;
+		if(ptrace(PTRACE_SYSEMU_SINGLESTEP, pid, 0, 0) < 0)
+			goto fail;
+		CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
+		if(n < 0)
+			panic("check_ptrace : wait failed, errno = %d", errno);
+		if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP))
+			panic("check_ptrace : expected (SIGTRAP|SYSCALL_TRAP), "
+			      "got status = %d", status);
+
+		syscall = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_NR_OFFSET,
+				 0);
+		if(syscall == __NR_getpid){
+			if (!count)
+				panic("check_ptrace : SYSEMU_SINGLESTEP doesn't singlestep");
+			n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET,
+				   os_getpid());
+			if(n < 0)
+				panic("check_sysemu : failed to modify system "
+				      "call return, errno = %d", errno);
+			break;
+		}
+	}
+	if (stop_ptraced_child(pid, stack, 0, 0) < 0)
+		goto fail_stopped;
+
+	sysemu_supported = 2;
+	printk("OK\n");
+
+	if ( !force_sysemu_disabled )
+		set_using_sysemu(sysemu_supported);
+	return;
+
+fail:
+	stop_ptraced_child(pid, stack, 1, 0);
+fail_stopped:
+	printk("missing\n");
+}
+
+void __init check_ptrace(void)
+{
+	void *stack;
+	int pid, syscall, n, status;
+
+	printk("Checking that ptrace can change system call numbers...");
+	pid = start_ptraced_child(&stack);
+
+	if (ptrace(PTRACE_OLDSETOPTIONS, pid, 0, (void *)PTRACE_O_TRACESYSGOOD) < 0)
+		panic("check_ptrace: PTRACE_SETOPTIONS failed, errno = %d", errno);
+
+	while(1){
+		if(ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0)
+			panic("check_ptrace : ptrace failed, errno = %d", 
+			      errno);
+		CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
+		if(n < 0)
+			panic("check_ptrace : wait failed, errno = %d", errno);
+		if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP + 0x80))
+			panic("check_ptrace : expected SIGTRAP + 0x80, "
+			      "got status = %d", status);
+		
+		syscall = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_NR_OFFSET,
+				 0);
+		if(syscall == __NR_getpid){
+			n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET,
+				   __NR_getppid);
+			if(n < 0)
+				panic("check_ptrace : failed to modify system "
+				      "call, errno = %d", errno);
+			break;
+		}
+	}
+	stop_ptraced_child(pid, stack, 0, 1);
+	printk("OK\n");
+	check_sysemu();
+}
+
+int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr)
+{
+	sigjmp_buf buf;
+	int n;
+
+	*jmp_ptr = &buf;
+	n = sigsetjmp(buf, 1);
+	if(n != 0)
+		return(n);
+	(*fn)(arg);
+	return(0);
+}
+
+void forward_pending_sigio(int target)
+{
+	sigset_t sigs;
+
+	if(sigpending(&sigs)) 
+		panic("forward_pending_sigio : sigpending failed");
+	if(sigismember(&sigs, SIGIO))
+		kill(target, SIGIO);
+}
+
+#ifdef UML_CONFIG_MODE_SKAS
+static inline int check_skas3_ptrace_support(void)
+{
+	struct ptrace_faultinfo fi;
+	void *stack;
+	int pid, n, ret = 1;
+
+	printf("Checking for the skas3 patch in the host...");
+	pid = start_ptraced_child(&stack);
+
+	n = ptrace(PTRACE_FAULTINFO, pid, 0, &fi);
+	if (n < 0) {
+		if(errno == EIO)
+			printf("not found\n");
+		else {
+			perror("not found");
+		}
+		ret = 0;
+	} else {
+		printf("found\n");
+	}
+
+	init_registers(pid);
+	stop_ptraced_child(pid, stack, 1, 1);
+
+	return(ret);
+}
+
+int can_do_skas(void)
+{
+	int ret = 1;
+
+	printf("Checking for /proc/mm...");
+	if (os_access("/proc/mm", OS_ACC_W_OK) < 0) {
+		printf("not found\n");
+		ret = 0;
+		goto out;
+	} else {
+		printf("found\n");
+	}
+
+	ret = check_skas3_ptrace_support();
+out:
+	return ret;
+}
+#else
+int can_do_skas(void)
+{
+	return(0);
+}
+#endif