[PATCH] uml: move libc-dependent code from signal_user.c

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

This moves all systemcalls from signal_user.c file under os-Linux dir

Signed-off-by: Gennady Sharapov <Gennady.V.Sharapov@intel.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

15 files changed, 4 insertions, 181 deletions

diff --git a/arch/um/kernel/Makefile b/arch/um/kernel/Makefile
index 6f77005..9ce6c57 100644
--- a/arch/um/kernel/Makefile
+++ b/arch/um/kernel/Makefile
@@ -9,7 +9,7 @@ clean-files :=
 obj-y = config.o exec_kern.o exitcode.o \
 	init_task.o irq.o irq_user.o ksyms.o mem.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 time.o \
+	signal_kern.o smp.o syscall_kern.o sysrq.o time.o \
 	time_kern.o tlb.o trap_kern.o trap_user.o uaccess.o um_arch.o umid.o \
 	user_util.o
 
diff --git a/arch/um/kernel/irq_user.c b/arch/um/kernel/irq_user.c
index 50a2aa3..0e32f5f 100644
--- a/arch/um/kernel/irq_user.c
+++ b/arch/um/kernel/irq_user.c
@@ -15,7 +15,6 @@
 #include "kern_util.h"
 #include "user.h"
 #include "process.h"
-#include "signal_user.h"
 #include "sigio.h"
 #include "irq_user.h"
 #include "os.h"
diff --git a/arch/um/kernel/process_kern.c b/arch/um/kernel/process_kern.c
index 651abf2..d2d3f25 100644
--- a/arch/um/kernel/process_kern.c
+++ b/arch/um/kernel/process_kern.c
@@ -36,7 +36,6 @@
 #include "kern_util.h"
 #include "kern.h"
 #include "signal_kern.h"
-#include "signal_user.h"
 #include "init.h"
 #include "irq_user.h"
 #include "mem_user.h"
diff --git a/arch/um/kernel/signal_kern.c b/arch/um/kernel/signal_kern.c
index 03618bd..7b0e0e8 100644
--- a/arch/um/kernel/signal_kern.c
+++ b/arch/um/kernel/signal_kern.c
@@ -22,7 +22,6 @@
 #include "asm/ucontext.h"
 #include "kern_util.h"
 #include "signal_kern.h"
-#include "signal_user.h"
 #include "kern.h"
 #include "frame_kern.h"
 #include "sigcontext.h"
diff --git a/arch/um/kernel/signal_user.c b/arch/um/kernel/signal_user.c
deleted file mode 100644
index 62f4578..0000000
--- a/arch/um/kernel/signal_user.c
+++ /dev/null
@@ -1,157 +0,0 @@
-/* 
- * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <signal.h>
-#include <errno.h>
-#include <stdarg.h>
-#include <string.h>
-#include <sys/mman.h>
-#include "user_util.h"
-#include "kern_util.h"
-#include "user.h"
-#include "signal_user.h"
-#include "signal_kern.h"
-#include "sysdep/sigcontext.h"
-#include "sigcontext.h"
-
-void set_sigstack(void *sig_stack, int size)
-{
-	stack_t stack = ((stack_t) { .ss_flags	= 0,
-				     .ss_sp	= (__ptr_t) sig_stack,
-				     .ss_size 	= size - sizeof(void *) });
-
-	if(sigaltstack(&stack, NULL) != 0)
-		panic("enabling signal stack failed, errno = %d\n", errno);
-}
-
-void set_handler(int sig, void (*handler)(int), int flags, ...)
-{
-	struct sigaction action;
-	va_list ap;
-	int mask;
-
-	va_start(ap, flags);
-	action.sa_handler = handler;
-	sigemptyset(&action.sa_mask);
-	while((mask = va_arg(ap, int)) != -1){
-		sigaddset(&action.sa_mask, mask);
-	}
-	va_end(ap);
-	action.sa_flags = flags;
-	action.sa_restorer = NULL;
-	if(sigaction(sig, &action, NULL) < 0)
-		panic("sigaction failed");
-}
-
-int change_sig(int signal, int on)
-{
-	sigset_t sigset, old;
-
-	sigemptyset(&sigset);
-	sigaddset(&sigset, signal);
-	sigprocmask(on ? SIG_UNBLOCK : SIG_BLOCK, &sigset, &old);
-	return(!sigismember(&old, signal));
-}
-
-/* Both here and in set/get_signal we don't touch SIGPROF, because we must not
- * disable profiling; it's safe because the profiling code does not interact
- * with the kernel code at all.*/
-
-static void change_signals(int type)
-{
-	sigset_t mask;
-
-	sigemptyset(&mask);
-	sigaddset(&mask, SIGVTALRM);
-	sigaddset(&mask, SIGALRM);
-	sigaddset(&mask, SIGIO);
-	if(sigprocmask(type, &mask, NULL) < 0)
-		panic("Failed to change signal mask - errno = %d", errno);
-}
-
-void block_signals(void)
-{
-	change_signals(SIG_BLOCK);
-}
-
-void unblock_signals(void)
-{
-	change_signals(SIG_UNBLOCK);
-}
-
-/* These are the asynchronous signals.  SIGVTALRM and SIGARLM are handled
- * together under SIGVTALRM_BIT.  SIGPROF is excluded because we want to
- * be able to profile all of UML, not just the non-critical sections.  If
- * profiling is not thread-safe, then that is not my problem.  We can disable
- * profiling when SMP is enabled in that case.
- */
-#define SIGIO_BIT 0
-#define SIGVTALRM_BIT 1
-
-static int enable_mask(sigset_t *mask)
-{
-	int sigs;
-
-	sigs = sigismember(mask, SIGIO) ? 0 : 1 << SIGIO_BIT;
-	sigs |= sigismember(mask, SIGVTALRM) ? 0 : 1 << SIGVTALRM_BIT;
-	sigs |= sigismember(mask, SIGALRM) ? 0 : 1 << SIGVTALRM_BIT;
-	return(sigs);
-}
-
-int get_signals(void)
-{
-	sigset_t mask;
-	
-	if(sigprocmask(SIG_SETMASK, NULL, &mask) < 0)
-		panic("Failed to get signal mask");
-	return(enable_mask(&mask));
-}
-
-int set_signals(int enable)
-{
-	sigset_t mask;
-	int ret;
-
-	sigemptyset(&mask);
-	if(enable & (1 << SIGIO_BIT)) 
-		sigaddset(&mask, SIGIO);
-	if(enable & (1 << SIGVTALRM_BIT)){
-		sigaddset(&mask, SIGVTALRM);
-		sigaddset(&mask, SIGALRM);
-	}
-
-	/* This is safe - sigprocmask is guaranteed to copy locally the
-	 * value of new_set, do his work and then, at the end, write to
-	 * old_set.
-	 */
-	if(sigprocmask(SIG_UNBLOCK, &mask, &mask) < 0)
-		panic("Failed to enable signals");
-	ret = enable_mask(&mask);
-	sigemptyset(&mask);
-	if((enable & (1 << SIGIO_BIT)) == 0) 
-		sigaddset(&mask, SIGIO);
-	if((enable & (1 << SIGVTALRM_BIT)) == 0){
-		sigaddset(&mask, SIGVTALRM);
-		sigaddset(&mask, SIGALRM);
-	}
-	if(sigprocmask(SIG_BLOCK, &mask, NULL) < 0)
-		panic("Failed to block signals");
-
-	return(ret);
-}
-
-/*
- * 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:
- */
diff --git a/arch/um/kernel/skas/include/skas.h b/arch/um/kernel/skas/include/skas.h
index daa2f85..01d489d 100644
--- a/arch/um/kernel/skas/include/skas.h
+++ b/arch/um/kernel/skas/include/skas.h
@@ -22,7 +22,6 @@ extern int start_idle_thread(void *stack, void *switch_buf_ptr,
 extern int user_thread(unsigned long stack, int flags);
 extern void userspace(union uml_pt_regs *regs);
 extern void new_thread_proc(void *stack, void (*handler)(int sig));
-extern void remove_sigstack(void);
 extern void new_thread_handler(int sig);
 extern void handle_syscall(union uml_pt_regs *regs);
 extern int map(struct mm_id * mm_idp, unsigned long virt,
diff --git a/arch/um/kernel/skas/process.c b/arch/um/kernel/skas/process.c
index 599d679..9264d40 100644
--- a/arch/um/kernel/skas/process.c
+++ b/arch/um/kernel/skas/process.c
@@ -31,7 +31,6 @@
 #include "proc_mm.h"
 #include "skas_ptrace.h"
 #include "chan_user.h"
-#include "signal_user.h"
 #include "registers.h"
 #include "mem.h"
 #include "uml-config.h"
@@ -514,16 +513,6 @@ int start_idle_thread(void *stack, void *switch_buf_ptr, void **fork_buf_ptr)
 	siglongjmp(**switch_buf, 1);
 }
 
-void remove_sigstack(void)
-{
-	stack_t stack = ((stack_t) { .ss_flags	= SS_DISABLE,
-				     .ss_sp	= NULL,
-				     .ss_size	= 0 });
-
-	if(sigaltstack(&stack, NULL) != 0)
-		panic("disabling signal stack failed, errno = %d\n", errno);
-}
-
 void initial_thread_cb_skas(void (*proc)(void *), void *arg)
 {
 	sigjmp_buf here;
diff --git a/arch/um/kernel/skas/process_kern.c b/arch/um/kernel/skas/process_kern.c
index 9c99025..09790cc 100644
--- a/arch/um/kernel/skas/process_kern.c
+++ b/arch/um/kernel/skas/process_kern.c
@@ -14,7 +14,6 @@
 #include "asm/atomic.h"
 #include "kern_util.h"
 #include "time_user.h"
-#include "signal_user.h"
 #include "skas.h"
 #include "os.h"
 #include "user_util.h"
diff --git a/arch/um/kernel/skas/trap_user.c b/arch/um/kernel/skas/trap_user.c
index 9950a67..28403d2 100644
--- a/arch/um/kernel/skas/trap_user.c
+++ b/arch/um/kernel/skas/trap_user.c
@@ -5,7 +5,6 @@
 
 #include <signal.h>
 #include <errno.h>
-#include "signal_user.h"
 #include "user_util.h"
 #include "kern_util.h"
 #include "task.h"
@@ -14,6 +13,7 @@
 #include "ptrace_user.h"
 #include "sysdep/ptrace.h"
 #include "sysdep/ptrace_user.h"
+#include "os.h"
 
 void sig_handler_common_skas(int sig, void *sc_ptr)
 {
diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c
index c40b611..11f518a 100644
--- a/arch/um/kernel/time.c
+++ b/arch/um/kernel/time.c
@@ -14,9 +14,9 @@
 #include "kern_util.h"
 #include "user.h"
 #include "process.h"
-#include "signal_user.h"
 #include "time_user.h"
 #include "kern_constants.h"
+#include "os.h"
 
 /* XXX This really needs to be declared and initialized in a kernel file since
  * it's in <linux/time.h>
diff --git a/arch/um/kernel/trap_user.c b/arch/um/kernel/trap_user.c
index e9ccd6b..e551107 100644
--- a/arch/um/kernel/trap_user.c
+++ b/arch/um/kernel/trap_user.c
@@ -17,7 +17,6 @@
 #include "sigcontext.h"
 #include "sysdep/sigcontext.h"
 #include "irq_user.h"
-#include "signal_user.h"
 #include "time_user.h"
 #include "task.h"
 #include "mode.h"
diff --git a/arch/um/kernel/tt/exec_kern.c b/arch/um/kernel/tt/exec_kern.c
index 065b504..136e54c 100644
--- a/arch/um/kernel/tt/exec_kern.c
+++ b/arch/um/kernel/tt/exec_kern.c
@@ -14,7 +14,6 @@
 #include "kern_util.h"
 #include "irq_user.h"
 #include "time_user.h"
-#include "signal_user.h"
 #include "mem_user.h"
 #include "os.h"
 #include "tlb.h"
diff --git a/arch/um/kernel/tt/process_kern.c b/arch/um/kernel/tt/process_kern.c
index cfaa373..14d4622 100644
--- a/arch/um/kernel/tt/process_kern.c
+++ b/arch/um/kernel/tt/process_kern.c
@@ -13,7 +13,6 @@
 #include "asm/ptrace.h"
 #include "asm/tlbflush.h"
 #include "irq_user.h"
-#include "signal_user.h"
 #include "kern_util.h"
 #include "user_util.h"
 #include "os.h"
diff --git a/arch/um/kernel/tt/tracer.c b/arch/um/kernel/tt/tracer.c
index d11e739..71daae2 100644
--- a/arch/um/kernel/tt/tracer.c
+++ b/arch/um/kernel/tt/tracer.c
@@ -19,7 +19,6 @@
 #include "sigcontext.h"
 #include "sysdep/sigcontext.h"
 #include "os.h"
-#include "signal_user.h"
 #include "user_util.h"
 #include "mem_user.h"
 #include "process.h"
diff --git a/arch/um/kernel/tt/trap_user.c b/arch/um/kernel/tt/trap_user.c
index fc10861..7501900 100644
--- a/arch/um/kernel/tt/trap_user.c
+++ b/arch/um/kernel/tt/trap_user.c
@@ -8,11 +8,11 @@
 #include <signal.h>
 #include "sysdep/ptrace.h"
 #include "sysdep/sigcontext.h"
-#include "signal_user.h"
 #include "user_util.h"
 #include "kern_util.h"
 #include "task.h"
 #include "tt.h"
+#include "os.h"
 
 void sig_handler_common_tt(int sig, void *sc_ptr)
 {