[PATCH] uml: move libc-dependent startup and signal code

The serial UML OS-abstraction layer patch (um/kernel dir).

This moves all systemcalls from process.c file under os-Linux dir and join
process.c and process_kern.c files.

Signed-off-by: Gennady Sharapov <gennady.v.sharapov@intel.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/include/os.h

@@ -153,6 +153,11 @@ extern int os_file_type(char *file);
 extern int os_file_mode(char *file, struct openflags *mode_out);
 extern int os_lock_file(int fd, int excl);
 
+/* start_up.c */
+extern void os_early_checks(void);
+extern int can_do_skas(void);
+
+/* process.c */
 extern unsigned long os_process_pc(int pid);
 extern int os_process_parent(int pid);
 extern void os_stop_process(int pid);
@@ -161,6 +166,9 @@ extern void os_kill_ptraced_process(int pid, int reap_child);
 extern void os_usr1_process(int pid);
 extern int os_getpid(void);
 extern int os_getpgrp(void);
+extern void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int));
+extern void init_new_thread_signals(int altstack);
+extern int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr);
 
 extern int os_map_memory(void *virt, int fd, unsigned long long off,
 			 unsigned long len, int r, int w, int x);
@@ -170,6 +178,13 @@ extern int os_unmap_memory(void *addr, int len);
 extern void os_flush_stdout(void);
 extern unsigned long long os_usecs(void);
 
+/* tt.c
+ * for tt mode only (will be deleted in future...)
+ */
+extern void forward_pending_sigio(int target);
+extern int start_fork_tramp(void *arg, unsigned long temp_stack,
+			    int clone_flags, int (*tramp)(void *));
+
 #endif
 
 /*

arch/um/include/user_util.h

@@ -54,8 +54,6 @@ extern void stack_protections(unsigned long address);
 extern void task_protections(unsigned long address);
 extern int wait_for_stop(int pid, int sig, int cont_type, void *relay);
 extern void *add_signal_handler(int sig, void (*handler)(int));
-extern int start_fork_tramp(void *arg, unsigned long temp_stack, 
-			    int clone_flags, int (*tramp)(void *));
 extern int linux_main(int argc, char **argv);
 extern void set_cmdline(char *cmd);
 extern void input_cb(void (*proc)(void *), void *arg, int arg_len);
@@ -64,8 +62,6 @@ extern void *um_kmalloc(int size);
 extern int switcheroo(int fd, int prot, void *from, void *to, int size);
 extern void setup_machinename(char *machine_out);
 extern void setup_hostinfo(void);
-extern void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int));
-extern void init_new_thread_signals(int altstack);
 extern void do_exec(int old_pid, int new_pid);
 extern void tracer_panic(char *msg, ...);
 extern char *get_umid(int only_if_set);
@@ -74,16 +70,12 @@ extern int detach(int pid, int sig);
 extern int attach(int pid);
 extern void kill_child_dead(int pid);
 extern int cont(int pid);
-extern void check_ptrace(void);
 extern void check_sigio(void);
-extern int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr);
 extern void write_sigio_workaround(void);
 extern void arch_check_bugs(void);
 extern int cpu_feature(char *what, char *buf, int len);
 extern int arch_handle_signal(int sig, union uml_pt_regs *regs);
 extern int arch_fixup(unsigned long address, void *sc_ptr);
-extern void forward_pending_sigio(int target);
-extern int can_do_skas(void);
 extern void arch_init_thread(void);
 extern int setjmp_wrapper(void (*proc)(void *, void *), ...);
 extern int raw(int fd);

arch/um/kernel/Makefile

@@ -8,11 +8,10 @@ clean-files :=
 
 obj-y = config.o exec_kern.o exitcode.o \
 	helper.o init_task.o irq.o irq_user.o ksyms.o main.o mem.o mem_user.o \
-	physmem.o process.o process_kern.o ptrace.o reboot.o resource.o \
-	sigio_user.o sigio_kern.o signal_kern.o signal_user.o smp.o \
-	syscall_kern.o sysrq.o tempfile.o time.o time_kern.o \
-	tlb.o trap_kern.o trap_user.o uaccess_user.o um_arch.o umid.o \
-	user_util.o
+	physmem.o process_kern.o ptrace.o reboot.o resource.o sigio_user.o \
+	sigio_kern.o signal_kern.o signal_user.o smp.o syscall_kern.o sysrq.o \
+	tempfile.o time.o time_kern.o tlb.o trap_kern.o trap_user.o \
+	uaccess_user.o um_arch.o umid.o user_util.o
 
 obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o
 obj-$(CONFIG_GPROF)	+= gprof_syms.o
@@ -25,8 +24,8 @@ obj-$(CONFIG_MODE_SKAS) += skas/
 
 user-objs-$(CONFIG_TTY_LOG) += tty_log.o
 
-USER_OBJS := $(user-objs-y) config.o helper.o main.o process.o tempfile.o \
-	time.o tty_log.o umid.o user_util.o
+USER_OBJS := $(user-objs-y) config.o helper.o main.o tempfile.o time.o \
+	tty_log.o umid.o user_util.o
 
 include arch/um/scripts/Makefile.rules
 

arch/um/kernel/um_arch.c

@@ -333,6 +333,7 @@ int linux_main(int argc, char **argv)
 	if(have_root == 0)
 		add_arg(DEFAULT_COMMAND_LINE);
 
+	os_early_checks();
 	mode_tt = force_tt ? 1 : !can_do_skas();
 #ifndef CONFIG_MODE_TT
 	if (mode_tt) {
@@ -470,7 +471,6 @@ void __init setup_arch(char **cmdline_p)
 void __init check_bugs(void)
 {
 	arch_check_bugs();
-	check_ptrace();
 	check_sigio();
 	check_devanon();
 }

arch/um/os-Linux/Makefile

@@ -3,10 +3,11 @@
 # Licensed under the GPL
 #
 
-obj-y = aio.o elf_aux.o file.o process.o signal.o time.o tty.o user_syms.o \
-	drivers/ sys-$(SUBARCH)/
+obj-y = aio.o elf_aux.o file.o process.o signal.o start_up.o time.o tt.o \
+	tty.o user_syms.o drivers/ sys-$(SUBARCH)/
 
-USER_OBJS := aio.o elf_aux.o file.o process.o signal.o time.o tty.o
+USER_OBJS := aio.o elf_aux.o file.o process.o signal.o start_up.o time.o tt.o \
+	tty.o
 
 CFLAGS_user_syms.o += -DSUBARCH_$(SUBARCH)
 

arch/um/os-Linux/process.c

@@ -3,17 +3,21 @@
  * Licensed under the GPL
  */
 
-#include <unistd.h>
 #include <stdio.h>
 #include <errno.h>
 #include <signal.h>
+#include <setjmp.h>
 #include <linux/unistd.h>
 #include <sys/mman.h>
 #include <sys/wait.h>
 #include "ptrace_user.h"
 #include "os.h"
 #include "user.h"
 #include "user_util.h"
+#include "signal_user.h"
+#include "process.h"
+#include "irq_user.h"
+#include "kern_util.h"
 
 #define ARBITRARY_ADDR -1
 #define FAILURE_PID    -1
@@ -114,8 +118,10 @@ void os_usr1_process(int pid)
 	kill(pid, SIGUSR1);
 }
 
-/*Don't use the glibc version, which caches the result in TLS. It misses some
- * syscalls, and also breaks with clone(), which does not unshare the TLS.*/
+/* Don't use the glibc version, which caches the result in TLS. It misses some
+ * syscalls, and also breaks with clone(), which does not unshare the TLS.
+ */
+
 inline _syscall0(pid_t, getpid)
 
 int os_getpid(void)
@@ -164,6 +170,52 @@ int os_unmap_memory(void *addr, int len)
         return(0);
 }
 
+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(SIGUSR2, (__sighandler_t) sig_handler,
+		    flags, SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+	signal(SIGHUP, SIG_IGN);
+
+	init_irq_signals(altstack);
+}
+
+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);
+}
+
 /*
  * Overrides for Emacs so that we follow Linus's tabbing style.
  * Emacs will notice this stuff at the end of the file and automatically