[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>

1 files changed, 55 insertions, 3 deletions

diff --git a/arch/um/os-Linux/process.c b/arch/um/os-Linux/process.c
index 1e126bfd31a7..d32413e4b4ce 100644
--- a/arch/um/os-Linux/process.c
+++ b/arch/um/os-Linux/process.c
@@ -3,10 +3,10 @@
  * 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>
@@ -14,6 +14,10 @@
 #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