Forward ported a number of bug fixes from 2.4, including SA_SIGINFO

signal delivery, protecting skas mode against tmpfs running out of
space, protecting the UML main thread against accidentally running
kernel code, and a couple of data corruption bugs.

arch/um/include/frame.h

@@ -15,12 +15,12 @@ struct frame_common {
 	int sr_index;
 	int sr_relative;
 	int sp_index;
+	struct arch_frame_data arch;
 };
 
 struct sc_frame {
 	struct frame_common common;
 	int sc_index;
-	struct arch_frame_data arch;
 };
 
 extern struct sc_frame signal_frame_sc;
@@ -31,6 +31,8 @@ struct si_frame {
 	struct frame_common common;
 	int sip_index;
 	int si_index;
+	int ucp_index;
+	int uc_index;
 };
 
 extern struct si_frame signal_frame_si;

arch/um/include/irq_user.h

@@ -8,7 +8,7 @@
 
 enum { IRQ_READ, IRQ_WRITE };
 
-extern void sigio_handler(int sig, struct uml_pt_regs *regs);
+extern void sigio_handler(int sig, union uml_pt_regs *regs);
 extern int activate_fd(int irq, int fd, int type, void *dev_id);
 extern void free_irq_by_irq_and_dev(int irq, void *dev_id);
 extern void free_irq_by_fd(int fd);

arch/um/include/kern_util.h

@@ -47,7 +47,7 @@ extern void free_stack(unsigned long stack, int order);
 extern void add_input_request(int op, void (*proc)(int), void *arg);
 extern int sys_execve(char *file, char **argv, char **env);
 extern char *current_cmd(void);
-extern void timer_handler(int sig, struct uml_pt_regs *regs);
+extern void timer_handler(int sig, union uml_pt_regs *regs);
 extern int set_signals(int enable);
 extern void force_sigbus(void);
 extern int pid_to_processor_id(int pid);
@@ -64,7 +64,7 @@ extern void *syscall_sp(void *t);
 extern void syscall_trace(void);
 extern int hz(void);
 extern void idle_timer(void);
-extern unsigned int do_IRQ(int irq, struct uml_pt_regs *regs);
+extern unsigned int do_IRQ(int irq, union uml_pt_regs *regs);
 extern int external_pid(void *t);
 extern int pid_to_processor_id(int pid);
 extern void boot_timer_handler(int sig);
@@ -77,10 +77,10 @@ extern int init_ptrace_proxy(int idle_pid, int startup, int stop);
 extern int init_parent_proxy(int pid);
 extern int singlestepping(void *t);
 extern void check_stack_overflow(void *ptr);
-extern void relay_signal(int sig, struct uml_pt_regs *regs);
+extern void relay_signal(int sig, union uml_pt_regs *regs);
 extern void not_implemented(void);
 extern int user_context(unsigned long sp);
-extern void timer_irq(struct uml_pt_regs *regs);
+extern void timer_irq(union uml_pt_regs *regs);
 extern void unprotect_stack(unsigned long stack);
 extern void do_uml_exitcalls(void);
 extern int attach_debugger(int idle_pid, int pid, int stop);
@@ -101,7 +101,7 @@ extern void *get_init_task(void);
 extern int clear_user_proc(void *buf, int size);
 extern int copy_to_user_proc(void *to, void *from, int size);
 extern int copy_from_user_proc(void *to, void *from, int size);
-extern void bus_handler(int sig, struct uml_pt_regs *regs);
+extern void bus_handler(int sig, union uml_pt_regs *regs);
 extern long execute_syscall(void *r);
 extern int smp_sigio_handler(void);
 extern void *get_current(void);

arch/um/include/sysdep-i386/frame.h

@@ -7,7 +7,8 @@
 #define __FRAME_I386_H
 
 struct arch_frame_data_raw {
-	unsigned long sc_end;
+	unsigned long fp_start;
+	unsigned long sr;
 };
 
 struct arch_frame_data {

arch/um/include/sysdep-i386/frame_kern.h

@@ -16,6 +16,15 @@ static inline void *sp_to_sc(unsigned long sp)
 	return((void *) sp);
 }
 
+static inline void *sp_to_uc(unsigned long sp)
+{
+	unsigned long uc;
+
+	uc = sp + signal_frame_si.uc_index - 
+		signal_frame_si.common.sp_index - 4;
+	return((void *) uc);
+}
+
 static inline void *sp_to_rt_sc(unsigned long sp)
 {
 	unsigned long sc;
@@ -42,7 +51,7 @@ static inline void *sp_to_rt_mask(unsigned long sp)
 
 	mask = sp - signal_frame_si.common.sp_index + 
 		signal_frame_si.common.len + 
-		sc_size(&signal_frame_sc.arch) - 4;
+		sc_size(&signal_frame_si.common.arch) - 4;
 	return((void *) mask);
 }
 

arch/um/include/sysdep-i386/frame_user.h

@@ -18,26 +18,35 @@
  * setup_arch_frame uses that data to figure out what 
  * arch_frame_data.fpstate_size should be.  It really has no idea, since it's
  * not allowed to do sizeof(struct fpstate) but it's safe to consider that it's
- * everything from the end of the sgcontext up to the top of the stack.  So,
+ * everything from the end of the sigcontext up to the top of the stack.  So,
  * it masks off the page number to get the offset within the page and subtracts
  * that from the page size, and that's how big the fpstate struct will be
  * considered to be.
  */
 
 static inline void setup_arch_frame_raw(struct arch_frame_data_raw *data,
-					struct sigcontext *sc)
+					void *end, unsigned long srp)
 {
-	data->sc_end = (unsigned long) sc;
-	data->sc_end += sizeof(*sc);
+	unsigned long sr = *((unsigned long *) srp);
+
+	data->fp_start = (unsigned long) end;
+	if((sr & PAGE_MASK) == ((unsigned long) end & PAGE_MASK))
+		data->sr = sr;
+	else data->sr = 0;
 }
 
 static inline void setup_arch_frame(struct arch_frame_data_raw *in, 
 				    struct arch_frame_data *out)
 {
-	unsigned long fpstate_start = in->sc_end;
+	unsigned long fpstate_start = in->fp_start;
 
+	if(in->sr == 0){
 		fpstate_start &= ~PAGE_MASK;
 		out->fpstate_size = PAGE_SIZE - fpstate_start;
+	}
+	else {
+		out->fpstate_size = in->sr - fpstate_start;
+	}
 }
 
 /* This figures out where on the stack the SA_RESTORER function address

arch/um/include/sysdep-i386/ptrace.h

@@ -7,72 +7,101 @@
 #define __SYSDEP_I386_PTRACE_H
 
 #include "uml-config.h"
+
+#ifdef CONFIG_MODE_TT
 #include "ptrace-tt.h"
+#endif
+
+#ifdef CONFIG_MODE_SKAS
 #include "ptrace-skas.h"
+#endif
+
 #include "choose-mode.h"
 
-struct uml_pt_regs {
-	unsigned long args[6];
-	long syscall;
-	int is_user;
-	union {
+union uml_pt_regs {
 #ifdef CONFIG_MODE_TT
-		void *tt;
+	struct tt_regs {
+		long syscall;
+		void *sc;
+	} tt;
 #endif
 #ifdef CONFIG_MODE_SKAS
-		struct {
+	struct skas_regs {
 		unsigned long regs[HOST_FRAME_SIZE];
 		unsigned long fp[HOST_FP_SIZE];
 		unsigned long xfp[HOST_XFP_SIZE];
 		unsigned long fault_addr;
 		unsigned long fault_type;
 		unsigned long trap_type;
+		long syscall;
+		int is_user;
 	} skas;
 #endif
-	} mode;
 };
 
-#define EMPTY_UML_PT_REGS { \
-	syscall : 	-1, \
-	args : 		{ [0 ... 5] = 0 }, \
-	is_user :	0 }
+#define EMPTY_UML_PT_REGS { }
 
 extern int mode_tt;
 
+#define UPT_SC(r) ((r)->tt.sc)
 #define UPT_IP(r) \
-	CHOOSE_MODE(SC_IP((r)->mode.tt), REGS_IP((r)->mode.skas.regs))
+	CHOOSE_MODE(SC_IP(UPT_SC(r)), REGS_IP((r)->skas.regs))
 #define UPT_SP(r) \
-	CHOOSE_MODE(SC_SP((r)->mode.tt), REGS_SP((r)->mode.skas.regs))
+	CHOOSE_MODE(SC_SP(UPT_SC(r)), REGS_SP((r)->skas.regs))
 #define UPT_EFLAGS(r) \
-	CHOOSE_MODE(SC_EFLAGS((r)->mode.tt), REGS_EFLAGS((r)->mode.skas.regs))
+	CHOOSE_MODE(SC_EFLAGS(UPT_SC(r)), REGS_EFLAGS((r)->skas.regs))
 #define UPT_EAX(r) \
-	CHOOSE_MODE(SC_EAX((r)->mode.tt), REGS_EAX((r)->mode.skas.regs))
+	CHOOSE_MODE(SC_EAX(UPT_SC(r)), REGS_EAX((r)->skas.regs))
 #define UPT_EBX(r) \
-	CHOOSE_MODE(SC_EBX((r)->mode.tt), REGS_EBX((r)->mode.skas.regs))
+	CHOOSE_MODE(SC_EBX(UPT_SC(r)), REGS_EBX((r)->skas.regs))
 #define UPT_ECX(r) \
-	CHOOSE_MODE(SC_ECX((r)->mode.tt), REGS_ECX((r)->mode.skas.regs))
+	CHOOSE_MODE(SC_ECX(UPT_SC(r)), REGS_ECX((r)->skas.regs))
 #define UPT_EDX(r) \
-	CHOOSE_MODE(SC_EDX((r)->mode.tt), REGS_EDX((r)->mode.skas.regs))
+	CHOOSE_MODE(SC_EDX(UPT_SC(r)), REGS_EDX((r)->skas.regs))
 #define UPT_ESI(r) \
-	CHOOSE_MODE(SC_ESI((r)->mode.tt), REGS_ESI((r)->mode.skas.regs))
+	CHOOSE_MODE(SC_ESI(UPT_SC(r)), REGS_ESI((r)->skas.regs))
 #define UPT_EDI(r) \
-	CHOOSE_MODE(SC_EDI((r)->mode.tt), REGS_EDI((r)->mode.skas.regs))
+	CHOOSE_MODE(SC_EDI(UPT_SC(r)), REGS_EDI((r)->skas.regs))
 #define UPT_EBP(r) \
-	CHOOSE_MODE(SC_EBP((r)->mode.tt), REGS_EBP((r)->mode.skas.regs))
-#define UPT_ORIG_EAX(r) ((r)->syscall)
+	CHOOSE_MODE(SC_EBP(UPT_SC(r)), REGS_EBP((r)->skas.regs))
+#define UPT_ORIG_EAX(r) \
+	CHOOSE_MODE((r)->tt.syscall, (r)->skas.syscall)
 #define UPT_CS(r) \
-	CHOOSE_MODE(SC_CS((r)->mode.tt), REGS_CS((r)->mode.skas.regs))
+	CHOOSE_MODE(SC_CS(UPT_SC(r)), REGS_CS((r)->skas.regs))
 #define UPT_SS(r) \
-	CHOOSE_MODE(SC_SS((r)->mode.tt), REGS_SS((r)->mode.skas.regs))
+	CHOOSE_MODE(SC_SS(UPT_SC(r)), REGS_SS((r)->skas.regs))
 #define UPT_DS(r) \
-	CHOOSE_MODE(SC_DS((r)->mode.tt), REGS_DS((r)->mode.skas.regs))
+	CHOOSE_MODE(SC_DS(UPT_SC(r)), REGS_DS((r)->skas.regs))
 #define UPT_ES(r) \
-	CHOOSE_MODE(SC_ES((r)->mode.tt), REGS_ES((r)->mode.skas.regs))
+	CHOOSE_MODE(SC_ES(UPT_SC(r)), REGS_ES((r)->skas.regs))
 #define UPT_FS(r) \
-	CHOOSE_MODE(SC_FS((r)->mode.tt), REGS_FS((r)->mode.skas.regs))
+	CHOOSE_MODE(SC_FS(UPT_SC(r)), REGS_FS((r)->skas.regs))
 #define UPT_GS(r) \
-	CHOOSE_MODE(SC_GS((r)->mode.tt), REGS_GS((r)->mode.skas.regs))
-#define UPT_SC(r) ((r)->mode.tt)
+	CHOOSE_MODE(SC_GS(UPT_SC(r)), REGS_GS((r)->skas.regs))
+
+#define UPT_SYSCALL_ARG1(r) UPT_EBX(r)
+#define UPT_SYSCALL_ARG2(r) UPT_ECX(r)
+#define UPT_SYSCALL_ARG3(r) UPT_EDX(r)
+#define UPT_SYSCALL_ARG4(r) UPT_ESI(r)
+#define UPT_SYSCALL_ARG5(r) UPT_EDI(r)
+#define UPT_SYSCALL_ARG6(r) UPT_EBP(r)
+
+extern int user_context(unsigned long sp);
+
+#define UPT_IS_USER(r) \
+	CHOOSE_MODE(user_context(UPT_SP(r)), (r)->skas.is_user)
+
+struct syscall_args {
+	unsigned long args[6];
+};
+
+#define SYSCALL_ARGS(r) ((struct syscall_args) \
+                        { .args = { UPT_SYSCALL_ARG1(r), \
+                                    UPT_SYSCALL_ARG2(r), \
+ 			            UPT_SYSCALL_ARG3(r), \
+                                    UPT_SYSCALL_ARG4(r), \
+		                    UPT_SYSCALL_ARG5(r), \
+                                    UPT_SYSCALL_ARG6(r) } } )
 
 #define UPT_REG(regs, reg) \
 	({	unsigned long val; \
@@ -129,28 +158,26 @@ extern int mode_tt;
 	} while (0)
 
 #define UPT_SET_SYSCALL_RETURN(r, res) \
-	CHOOSE_MODE(SC_SET_SYSCALL_RETURN((r)->mode.tt, (res)), \
-                    REGS_SET_SYSCALL_RETURN((r)->mode.skas.regs, (res)))
+	CHOOSE_MODE(SC_SET_SYSCALL_RETURN(UPT_SC(r), (res)), \
+                    REGS_SET_SYSCALL_RETURN((r)->skas.regs, (res)))
 
 #define UPT_RESTART_SYSCALL(r) \
-	CHOOSE_MODE(SC_RESTART_SYSCALL((r)->mode.tt), \
-		    REGS_RESTART_SYSCALL((r)->mode.skas.regs))
+	CHOOSE_MODE(SC_RESTART_SYSCALL(UPT_SC(r)), \
+		    REGS_RESTART_SYSCALL((r)->skas.regs))
 
 #define UPT_ORIG_SYSCALL(r) UPT_EAX(r)
-#define UPT_SYSCALL_NR(r) ((r)->syscall)
+#define UPT_SYSCALL_NR(r) UPT_ORIG_EAX(r)
 #define UPT_SYSCALL_RET(r) UPT_EAX(r)
 
 #define UPT_SEGV_IS_FIXABLE(r) \
-	CHOOSE_MODE(SC_SEGV_IS_FIXABLE(r->mode.tt), \
-		    REGS_SEGV_IS_FIXABLE(&r->mode.skas))
+	CHOOSE_MODE(SC_SEGV_IS_FIXABLE(UPT_SC(r)), \
+                    REGS_SEGV_IS_FIXABLE(&r->skas))
 
 #define UPT_FAULT_ADDR(r) \
-	CHOOSE_MODE(SC_FAULT_ADDR(r->mode.tt), \
-		    REGS_FAULT_ADDR(&r->mode.skas))
+	CHOOSE_MODE(SC_FAULT_ADDR(UPT_SC(r)), REGS_FAULT_ADDR(&r->skas))
 
 #define UPT_FAULT_WRITE(r) \
-	CHOOSE_MODE(SC_FAULT_WRITE(r->mode.tt), \
-		    REGS_FAULT_WRITE(&r->mode.skas))
+	CHOOSE_MODE(SC_FAULT_WRITE(UPT_SC(r)), REGS_FAULT_WRITE(&r->skas))
 
 #endif
 

arch/um/include/sysdep-i386/sigcontext.h

@@ -33,34 +33,6 @@
 
 #define SC_SEGV_IS_FIXABLE(sc) (SEGV_IS_FIXABLE(SC_TRAPNO(sc)))
 
-#ifdef CONFIG_MODE_TT
-/* XXX struct sigcontext needs declaring by now */
-static inline void sc_to_regs(struct uml_pt_regs *regs, struct sigcontext *sc,
-			      unsigned long syscall)
-{
-	regs->syscall = syscall;
-	regs->args[0] = SC_EBX(sc);
-	regs->args[1] = SC_ECX(sc);
-	regs->args[2] = SC_EDX(sc);
-	regs->args[3] = SC_ESI(sc);
-	regs->args[4] = SC_EDI(sc);
-	regs->args[5] = SC_EBP(sc);
-}
-#endif
-
-#ifdef CONFIG_MODE_SKAS
-static inline void host_to_regs(struct uml_pt_regs *regs)
-{
-	regs->syscall = UPT_ORIG_EAX(regs);
-	regs->args[0] = UPT_EBX(regs);
-	regs->args[1] = UPT_ECX(regs);
-	regs->args[2] = UPT_EDX(regs);
-	regs->args[3] = UPT_ESI(regs);
-	regs->args[4] = UPT_EDI(regs);
-	regs->args[5] = UPT_EBP(regs);
-}
-#endif
-
 extern unsigned long *sc_sigmask(void *sc_ptr);
 extern int sc_get_fpregs(unsigned long buf, void *sc_ptr);
 

arch/um/include/sysdep-i386/syscalls.h

@@ -4,10 +4,12 @@
  */
 
 #include "asm/unistd.h"
+#include "sysdep/ptrace.h"
 
 typedef long syscall_handler_t(struct pt_regs);
 
-#define EXECUTE_SYSCALL(syscall, regs) (*sys_call_table[syscall])(*regs);
+#define EXECUTE_SYSCALL(syscall, regs) \
+	((long (*)(struct syscall_args)) (*sys_call_table[syscall]))(SYSCALL_ARGS(&regs->regs))
 
 extern syscall_handler_t sys_modify_ldt;
 extern syscall_handler_t old_mmap_i386;

arch/um/include/uml_uaccess.h

+/*
+ * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UML_UACCESS_H__
+#define __UML_UACCESS_H__
+
+extern int __do_copy_to_user(void *to, const void *from, int n,
+				  void **fault_addr, void **fault_catcher);
+extern unsigned long __do_user_copy(void *to, const void *from, int n,
+				    void **fault_addr, void **fault_catcher,
+				    void (*op)(void *to, const void *from,
+					       int n), int *faulted_out);
+void __do_copy(void *to, const void *from, int n);
+
+#endif
+
+/*
+ * 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:
+ */

arch/um/include/user_util.h

@@ -24,7 +24,7 @@ struct cpu_task {
 extern struct cpu_task cpu_tasks[];
 
 struct signal_info {
-	void (*handler)(int, struct uml_pt_regs *);
+	void (*handler)(int, union uml_pt_regs *);
 	int is_irq;
 };
 
@@ -87,7 +87,7 @@ 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 arch_handle_signal(int sig, struct uml_pt_regs *regs);
+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);

arch/um/kernel/Makefile

@@ -10,8 +10,8 @@ obj-y = checksum.o config.o exec_kern.o exitcode.o frame_kern.o frame.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 \
 	syscall_user.o sysrq.o sys_call_table.o tempfile.o time.o \
-	time_kern.o tlb.o trap_kern.o trap_user.o um_arch.o \
-	umid.o user_util.o
+	time_kern.o tlb.o trap_kern.o trap_user.o uaccess_user.o um_arch.o \
+	umid.o user_syms.o user_util.o
 
 obj-$(CONFIG_BLK_DEV_INITRD) += initrd_kern.o initrd_user.o
 obj-$(CONFIG_GPROF)	+= gprof_syms.o

arch/um/kernel/frame.c

@@ -110,6 +110,7 @@ struct common_raw {
 	unsigned long sig;
 	unsigned long sr;
 	unsigned long sp;	
+	struct arch_frame_data_raw arch;
 };
 
 #define SA_RESTORER (0x04000000)
@@ -173,7 +174,6 @@ struct sc_frame_raw {
 	struct common_raw common;
 	unsigned long sc;
 	int restorer;
-	struct arch_frame_data_raw arch;
 };
 
 /* Changed only during early boot */
@@ -185,7 +185,8 @@ static void sc_handler(int sig, struct sigcontext sc)
 	raw_sc->common.sr = frame_restorer();
 	raw_sc->common.sp = frame_sp();
 	raw_sc->sc = (unsigned long) ≻
-	setup_arch_frame_raw(&raw_sc->arch, &sc);
+	setup_arch_frame_raw(&raw_sc->common.arch, &sc + 1, raw_sc->common.sr);
+
 	os_stop_process(os_getpid());
 	kill(getpid(), SIGKILL);
 }
@@ -205,18 +206,25 @@ struct si_frame_raw {
 	struct common_raw common;
 	unsigned long sip;
 	unsigned long si;
+	unsigned long ucp;
+	unsigned long uc;
 };
 
 /* Changed only during early boot */
 static struct si_frame_raw *raw_si = NULL;
 
-static void si_handler(int sig, siginfo_t *si)
+static void si_handler(int sig, siginfo_t *si, struct ucontext *ucontext)
 {
 	raw_si->common.sig = (unsigned long) &sig;
 	raw_si->common.sr = frame_restorer();
 	raw_si->common.sp = frame_sp();
 	raw_si->sip = (unsigned long) &si;
 	raw_si->si = (unsigned long) si;
+	raw_si->ucp = (unsigned long) &ucontext;
+	raw_si->uc = (unsigned long) ucontext;
+	setup_arch_frame_raw(&raw_si->common.arch, 
+			     ucontext->uc_mcontext.fpregs, raw_si->common.sr);
+	
 	os_stop_process(os_getpid());
 	kill(getpid(), SIGKILL);
 }
@@ -292,7 +300,7 @@ void capture_signal_stack(void)
 				    &signal_frame_sc.common);
 
 	signal_frame_sc.sc_index = raw_sc.sc - base;
-	setup_arch_frame(&raw_sc.arch, &signal_frame_sc.arch);
+	setup_arch_frame(&raw_sc.common.arch, &signal_frame_sc.common.arch);
 
 	/* Ditto for the sigcontext, sigrestorer layout */
 	raw_sc.restorer = 1;
@@ -300,6 +308,7 @@ void capture_signal_stack(void)
 				    (void *) top, sigstack, PAGE_SIZE, 
 				    &signal_frame_sc_sr.common);
 	signal_frame_sc_sr.sc_index = raw_sc.sc - base;
+	setup_arch_frame(&raw_sc.common.arch, &signal_frame_sc_sr.common.arch);
 
 	/* And the siginfo layout */
 
@@ -308,6 +317,9 @@ void capture_signal_stack(void)
 				    &signal_frame_si.common);
 	signal_frame_si.sip_index = raw_si.sip - base;
 	signal_frame_si.si_index = raw_si.si - base;
+	signal_frame_si.ucp_index = raw_si.ucp - base;
+	signal_frame_si.uc_index = raw_si.uc - base;
+	setup_arch_frame(&raw_si.common.arch, &signal_frame_si.common.arch);
 
 	if((munmap(stack, PAGE_SIZE) < 0) || 
 	   (munmap(sigstack, PAGE_SIZE) < 0)){

arch/um/kernel/frame_kern.c

@@ -6,6 +6,8 @@
 #include "asm/ptrace.h"
 #include "asm/uaccess.h"
 #include "asm/signal.h"
+#include "asm/uaccess.h"
+#include "asm/ucontext.h"
 #include "frame_kern.h"
 #include "sigcontext.h"
 #include "sysdep/ptrace.h"
@@ -27,48 +29,62 @@ static int copy_restorer(void (*restorer)(void), unsigned long start,
 			    sizeof(restorer)));
 }
 
-static int copy_sc_to_user(void *to, struct pt_regs *from)
+static int copy_sc_to_user(void *to, void *fp, struct pt_regs *from, 
+			   struct arch_frame_data *arch)
 {
-	return(CHOOSE_MODE(copy_sc_to_user_tt(to, from->regs.mode.tt, 
-					      &signal_frame_sc_sr.arch),
-			   copy_sc_to_user_skas(to, &from->regs,
+	return(CHOOSE_MODE(copy_sc_to_user_tt(to, fp, UPT_SC(&from->regs), 
+					      arch),
+			   copy_sc_to_user_skas(to, fp, &from->regs,
 						current->thread.cr2,
 						current->thread.err)));
 }
 
+static int copy_ucontext_to_user(struct ucontext *uc, void *fp, sigset_t *set,
+				 unsigned long sp)
+{
+	int err = 0;
+
+	err |= put_user(current->sas_ss_sp, &uc->uc_stack.ss_sp);
+	err |= put_user(sas_ss_flags(sp), &uc->uc_stack.ss_flags);
+	err |= put_user(current->sas_ss_size, &uc->uc_stack.ss_size);
+	err |= copy_sc_to_user(&uc->uc_mcontext, fp, &current->thread.regs,
+			       &signal_frame_si.common.arch);
+	err |= copy_to_user(&uc->uc_sigmask, set, sizeof(*set));
+	return(err);
+}
+
 int setup_signal_stack_si(unsigned long stack_top, int sig, 
 			  unsigned long handler, void (*restorer)(void), 
 			  struct pt_regs *regs, siginfo_t *info, 
 			  sigset_t *mask)
 {
-	unsigned long start, sc, sigs;
-	void *sip;
-	int sig_size = _NSIG_WORDS * sizeof(unsigned long);
+	unsigned long start;
+	void *sip, *ucp, *fp;
 
-	start = stack_top - signal_frame_si.common.len - 
-		sc_size(&signal_frame_sc.arch) - sig_size;
+	start = stack_top - signal_frame_si.common.len;
 	sip = (void *) (start + signal_frame_si.si_index);
-	sc = start + signal_frame_si.common.len;
-	sigs = sc + sc_size(&signal_frame_sc.arch);
+	ucp = (void *) (start + signal_frame_si.uc_index);
+	fp = (void *) (((unsigned long) ucp) + sizeof(struct ucontext));
 
 	if(restorer == NULL)
 		panic("setup_signal_stack_si - no restorer");
 
-	if(copy_sc_to_user((void *) sc, regs) ||
-	   copy_to_user((void *) start, signal_frame_si.common.data,
+	if(copy_to_user((void *) start, signal_frame_si.common.data,
 			signal_frame_si.common.len) ||
 	   copy_to_user((void *) (start + signal_frame_si.common.sig_index), 
 			&sig, sizeof(sig)) ||
 	   copy_siginfo_to_user(sip, info) ||
 	   copy_to_user((void *) (start + signal_frame_si.sip_index), &sip,
 			sizeof(sip)) ||
-	   copy_to_user((void *) sigs, mask, sig_size) ||
+	   copy_ucontext_to_user(ucp, fp, mask, PT_REGS_SP(regs)) ||
+	   copy_to_user((void *) (start + signal_frame_si.ucp_index), &ucp,
+			sizeof(ucp)) ||
 	   copy_restorer(restorer, start, signal_frame_si.common.sr_index,
 			 signal_frame_si.common.sr_relative))
 		return(1);
 	
 	PT_REGS_IP(regs) = handler;
-	PT_REGS_SP(regs) = start + signal_frame_sc.common.sp_index;
+	PT_REGS_SP(regs) = start + signal_frame_si.common.sp_index;
 	return(0);
 }
 
@@ -96,7 +112,8 @@ int setup_signal_stack_sc(unsigned long stack_top, int sig,
 	if(copy_to_user((void *) start, frame->data, frame->len) ||
 	   copy_to_user((void *) (start + frame->sig_index), &sig, 
 			sizeof(sig)) ||
-	   copy_sc_to_user(user_sc, regs) ||
+	   copy_sc_to_user(user_sc, NULL, regs, 
+			   &signal_frame_sc.common.arch) ||
 	   copy_to_user(sc_sigmask(user_sc), mask, sizeof(mask->sig[0])) ||
 	   copy_to_user((void *) sigs, &mask->sig[1], sig_size) ||
 	   copy_restorer(restorer, start, frame->sr_index, frame->sr_relative))

arch/um/kernel/irq.c

@@ -271,7 +271,7 @@ void enable_irq(unsigned int irq)
  * SMP cross-CPU interrupts have their own specific
  * handlers).
  */
-unsigned int do_IRQ(int irq, struct uml_pt_regs *regs)
+unsigned int do_IRQ(int irq, union uml_pt_regs *regs)
 {	
 	/* 
 	 * 0 return value means that this irq is already being

arch/um/kernel/irq_user.c

@@ -42,7 +42,7 @@ static int pollfds_size = 0;
 
 extern int io_count, intr_count;
 
-void sigio_handler(int sig, struct uml_pt_regs *regs)
+void sigio_handler(int sig, union uml_pt_regs *regs)
 {
 	struct irq_fd *irq_fd, *next;
 	int i, n;

arch/um/kernel/mem.c

@@ -27,6 +27,7 @@
 #include "init.h"
 #include "os.h"
 #include "mode_kern.h"
+#include "uml_uaccess.h"
 
 /* Changed during early boot */
 pgd_t swapper_pg_dir[1024];
@@ -414,8 +415,28 @@ __uml_setup("mem=", uml_mem_setup,
 
 struct page *arch_validate(struct page *page, int mask, int order)
 {
-	return(CHOOSE_MODE_PROC(arch_validate_tt, arch_validate_skas, page, 
-				mask, order));
+	unsigned long addr, zero = 0;
+	int i;
+
+ again:
+	if(page == NULL) return(page);
+	if(PageHighMem(page)) return(page);
+
+	addr = (unsigned long) page_address(page);
+	for(i = 0; i < (1 << order); i++){
+		current->thread.fault_addr = (void *) addr;
+		if(__do_copy_to_user((void *) addr, &zero, 
+				     sizeof(zero),
+				     &current->thread.fault_addr,
+				     &current->thread.fault_catcher)){
+			if(!(mask & __GFP_WAIT)) return(NULL);
+			else break;
+		}
+		addr += PAGE_SIZE;
+	}
+	if(i == (1 << order)) return(page);
+	page = _alloc_pages(mask, order);
+	goto again;
 }
 
 DECLARE_MUTEX(vm_reserved_sem);

arch/um/kernel/process_kern.c

@@ -169,8 +169,12 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
 
 void initial_thread_cb(void (*proc)(void *), void *arg)
 {
+	int save_kmalloc_ok = kmalloc_ok;
+
+	kmalloc_ok = 0;
 	CHOOSE_MODE_PROC(initial_thread_cb_tt, initial_thread_cb_skas, proc, 
 			 arg);
+	kmalloc_ok = save_kmalloc_ok;
 }
  
 unsigned long stack_sp(unsigned long page)

arch/um/kernel/signal_kern.c

@@ -18,6 +18,7 @@
 #include "asm/uaccess.h"
 #include "asm/unistd.h"
 #include "user_util.h"
+#include "asm/ucontext.h"
 #include "kern_util.h"
 #include "signal_kern.h"
 #include "signal_user.h"
@@ -237,20 +238,20 @@ int sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize)
 	}
 }
 
-static int copy_sc_from_user(struct pt_regs *to, void *from)
+static int copy_sc_from_user(struct pt_regs *to, void *from, 
+			     struct arch_frame_data *arch)
 {
 	int ret;
 
-	ret = CHOOSE_MODE(copy_sc_from_user_tt(to->regs.mode.tt, from, 
-					       &signal_frame_sc.arch),
+	ret = CHOOSE_MODE(copy_sc_from_user_tt(UPT_SC(&to->regs), from, arch),
 			  copy_sc_from_user_skas(&to->regs, from));
 	return(ret);
 }
 
 int sys_sigreturn(struct pt_regs regs)
 {
-	void *sc = sp_to_sc(PT_REGS_SP(&regs));
-	void *mask = sp_to_mask(PT_REGS_SP(&regs));
+	void *sc = sp_to_sc(PT_REGS_SP(&current->thread.regs));
+	void *mask = sp_to_mask(PT_REGS_SP(&current->thread.regs));
 	int sig_size = (_NSIG_WORDS - 1) * sizeof(unsigned long);
 
 	spin_lock_irq(&current->sig->siglock);
@@ -260,22 +261,25 @@ int sys_sigreturn(struct pt_regs regs)
 	sigdelsetmask(&current->blocked, ~_BLOCKABLE);
 	recalc_sigpending();
 	spin_unlock_irq(&current->sig->siglock);
-	copy_sc_from_user(&current->thread.regs, sc);
+	copy_sc_from_user(&current->thread.regs, sc, 
+			  &signal_frame_sc.common.arch);
 	return(PT_REGS_SYSCALL_RET(&current->thread.regs));
 }
 
 int sys_rt_sigreturn(struct pt_regs regs)
 {
-	void *sc = sp_to_rt_sc(PT_REGS_SP(&regs));
-	void *mask = sp_to_rt_mask(PT_REGS_SP(&regs));
+	struct ucontext *uc = sp_to_uc(PT_REGS_SP(&current->thread.regs));
+	void *fp;
 	int sig_size = _NSIG_WORDS * sizeof(unsigned long);
 
 	spin_lock_irq(&current->sig->siglock);
-	copy_from_user(&current->blocked, mask, sig_size);
+	copy_from_user(&current->blocked, &uc->uc_sigmask, sig_size);
 	sigdelsetmask(&current->blocked, ~_BLOCKABLE);
 	recalc_sigpending();
 	spin_unlock_irq(&current->sig->siglock);
-	copy_sc_from_user(&current->thread.regs, sc);
+	fp = (void *) (((unsigned long) uc) + sizeof(struct ucontext));
+	copy_sc_from_user(&current->thread.regs, &uc->uc_mcontext,
+			  &signal_frame_si.common.arch);
 	return(PT_REGS_SYSCALL_RET(&current->thread.regs));
 }
 

arch/um/kernel/skas/include/mode.h

@@ -12,10 +12,11 @@ extern unsigned long exec_fpx_regs[];
 extern int have_fpx_regs;
 
 extern void user_time_init_skas(void);
-extern int copy_sc_from_user_skas(struct uml_pt_regs *regs, void *from_ptr);
-extern int copy_sc_to_user_skas(void *to_ptr, struct uml_pt_regs *regs, 
+extern int copy_sc_from_user_skas(union uml_pt_regs *regs, void *from_ptr);
+extern int copy_sc_to_user_skas(void *to_ptr, void *fp, 
+				union uml_pt_regs *regs, 
 				unsigned long fault_addr, int fault_type);
-extern void sig_handler_common_skas(int sig, struct sigcontext *sc);
+extern void sig_handler_common_skas(int sig, void *sc_ptr);
 extern void halt_skas(void);
 extern void reboot_skas(void);
 extern void kill_off_processes_skas(void);

arch/um/kernel/skas/include/mode_kern.h

@@ -32,11 +32,10 @@ extern void before_mem_skas(unsigned long unused);
 extern unsigned long set_task_sizes_skas(int arg, unsigned long *host_size_out,
 					 unsigned long *task_size_out);
 extern int start_uml_skas(void);
-extern struct page *arch_validate_skas(struct page *page, int mask, int order);
 extern int external_pid_skas(struct task_struct *task);
 extern int thread_pid_skas(struct task_struct *task);
 
-#define kmem_end_skas (host_task_size)
+#define kmem_end_skas (host_task_size - 1024 * 1024)
 
 #endif
 

arch/um/kernel/skas/include/skas.h

@@ -17,21 +17,21 @@ extern void new_thread(void *stack, void **switch_buf_ptr, void **fork_buf_ptr,
 extern int start_idle_thread(void *stack, void *switch_buf_ptr, 
 			     void **fork_buf_ptr);
 extern int user_thread(unsigned long stack, int flags);
-extern void userspace(struct uml_pt_regs *regs);
+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(struct uml_pt_regs *regs);
+extern void handle_syscall(union uml_pt_regs *regs);
 extern void map(int fd, unsigned long virt, unsigned long phys, 
 		unsigned long len, int r, int w, int x);
 extern int unmap(int fd, void *addr, int len);
 extern int protect(int fd, unsigned long addr, unsigned long len, 
 		   int r, int w, int x, int must_succeed);
-extern void user_signal(int sig, struct uml_pt_regs *regs);
+extern void user_signal(int sig, union uml_pt_regs *regs);
 extern int singlestepping_skas(void);
 extern int new_mm(int from);
-extern void save_registers(struct uml_pt_regs *regs);
-extern void restore_registers(struct uml_pt_regs *regs);
+extern void save_registers(union uml_pt_regs *regs);
+extern void restore_registers(union uml_pt_regs *regs);
 extern void start_userspace(void);
 extern void init_registers(int pid);
 

arch/um/kernel/skas/mem.c

@@ -18,11 +18,6 @@ unsigned long set_task_sizes_skas(int arg, unsigned long *host_size_out,
 	return(((unsigned long) set_task_sizes_skas) & ~0xffffff);
 }
 
-struct page *arch_validate_skas(struct page *page, int mask, int order)
-{
-	return(page);
-}
-
 /*
  * Overrides for Emacs so that we follow Linus's tabbing style.
  * Emacs will notice this stuff at the end of the file and automatically

arch/um/kernel/skas/process.c

@@ -20,10 +20,10 @@
 #include "user_util.h"
 #include "kern_util.h"
 #include "skas.h"
-#include "skas_ptrace.h"
 #include "sysdep/sigcontext.h"
 #include "os.h"
 #include "proc_mm.h"
+#include "skas_ptrace.h"
 
 unsigned long exec_regs[FRAME_SIZE];
 unsigned long exec_fp_regs[HOST_FP_SIZE];
@@ -42,11 +42,11 @@ static void handle_segv(int pid)
 	segv(fault.addr, 0, FAULT_WRITE(fault.is_write), 1, NULL);
 }
 
-static void handle_trap(int pid, struct uml_pt_regs *regs)
+static void handle_trap(int pid, union uml_pt_regs *regs)
 {
 	int err, syscall_nr, status;
 
-	syscall_nr = PT_SYSCALL_NR(regs->mode.skas.regs);
+	syscall_nr = PT_SYSCALL_NR(regs->skas.regs);
 	if(syscall_nr < 1){
 		relay_signal(SIGTRAP, regs);
 		return;
@@ -115,7 +115,7 @@ void start_userspace(void)
 	userspace_pid = pid;
 }
 
-void userspace(struct uml_pt_regs *regs)
+void userspace(union uml_pt_regs *regs)
 {
 	int err, status, op;
 
@@ -131,7 +131,7 @@ void userspace(struct uml_pt_regs *regs)
 			panic("userspace - waitpid failed, errno = %d\n", 
 			      errno);
 
-		regs->is_user = 1;
+		regs->skas.is_user = 1;
 		save_registers(regs);
 
 		if(WIFSTOPPED(status)){
@@ -191,28 +191,28 @@ void thread_wait(void *sw, void *fb)
 		longjmp(*fork_buf, 1);
 }
 
-static int move_registers(int int_op, int fp_op, struct uml_pt_regs *regs,
+static int move_registers(int int_op, int fp_op, union uml_pt_regs *regs,
 			  unsigned long *fp_regs)
 {
-	if(ptrace(int_op, userspace_pid, 0, regs->mode.skas.regs) < 0)
+	if(ptrace(int_op, userspace_pid, 0, regs->skas.regs) < 0)
 		return(-errno);
 	if(ptrace(fp_op, userspace_pid, 0, fp_regs) < 0)
 		return(-errno);
 	return(0);
 }
 
-void save_registers(struct uml_pt_regs *regs)
+void save_registers(union uml_pt_regs *regs)
 {
 	unsigned long *fp_regs;
 	int err, fp_op;
 
 	if(have_fpx_regs){
 		fp_op = PTRACE_GETFPXREGS;
-		fp_regs = regs->mode.skas.xfp;
+		fp_regs = regs->skas.xfp;
 	}
 	else {
 		fp_op = PTRACE_GETFPREGS;
-		fp_regs = regs->mode.skas.fp;
+		fp_regs = regs->skas.fp;
 	}
 
 	err = move_registers(PTRACE_GETREGS, fp_op, regs, fp_regs);
@@ -221,18 +221,18 @@ void save_registers(struct uml_pt_regs *regs)
 		      err);
 }
 
-void restore_registers(struct uml_pt_regs *regs)
+void restore_registers(union uml_pt_regs *regs)
 {
 	unsigned long *fp_regs;
 	int err, fp_op;
 
 	if(have_fpx_regs){
 		fp_op = PTRACE_SETFPXREGS;
-		fp_regs = regs->mode.skas.xfp;
+		fp_regs = regs->skas.xfp;
 	}
 	else {
 		fp_op = PTRACE_SETFPREGS;
-		fp_regs = regs->mode.skas.fp;
+		fp_regs = regs->skas.fp;
 	}
 
 	err = move_registers(PTRACE_SETREGS, fp_op, regs, fp_regs);
@@ -272,10 +272,14 @@ int start_idle_thread(void *stack, void *switch_buf_ptr, void **fork_buf_ptr)
 		(*cb_proc)(cb_arg);
 		longjmp(*cb_back, 1);
 	}
-	else if(n == 3)
+	else if(n == 3){
+		kmalloc_ok = 0;
 		return(0);
-	else if(n == 4)
+	}
+	else if(n == 4){
+		kmalloc_ok = 0;
 		return(1);
+	}
 	longjmp(**switch_buf, 1);
 }
 
@@ -296,8 +300,11 @@ void initial_thread_cb_skas(void (*proc)(void *), void *arg)
 	cb_proc = proc;
 	cb_arg = arg;
 	cb_back = &here;
+
+	block_signals();
 	if(setjmp(here) == 0)
 		longjmp(initial_jmpbuf, 2);
+	unblock_signals();
 
 	cb_proc = NULL;
 	cb_arg = NULL;

arch/um/kernel/skas/process_kern.c

@@ -68,8 +68,7 @@ void new_thread_handler(int sig)
 	n = run_kernel_thread(fn, arg, &current->thread.exec_buf);
 	if(n == 1)
 		userspace(&current->thread.regs.regs);
-	else if(n == 2)
-		do_exit(0);
+	else do_exit(0);
 }
 
 void new_thread_proc(void *stack, void (*handler)(int sig))
@@ -109,21 +108,21 @@ int copy_thread_skas(int nr, unsigned long clone_flags, unsigned long sp,
   	void (*handler)(int);
 
 	if(current->thread.forking){
-	  	memcpy(&p->thread.regs.regs.mode.skas, 
-		       &current->thread.regs.regs.mode.skas, 
-		       sizeof(p->thread.regs.regs.mode.skas));
-		REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.mode.skas.regs, 0);
-		if(sp != 0) REGS_SP(p->thread.regs.regs.mode.skas.regs) = sp;
+	  	memcpy(&p->thread.regs.regs.skas, 
+		       &current->thread.regs.regs.skas, 
+		       sizeof(p->thread.regs.regs.skas));
+		REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.skas.regs, 0);
+		if(sp != 0) REGS_SP(p->thread.regs.regs.skas.regs) = sp;
 
 		handler = fork_handler;
 	}
 	else {
-	  	memcpy(p->thread.regs.regs.mode.skas.regs, exec_regs, 
-		       sizeof(p->thread.regs.regs.mode.skas.regs));
-		memcpy(p->thread.regs.regs.mode.skas.fp, exec_fp_regs, 
-		       sizeof(p->thread.regs.regs.mode.skas.fp));
-	  	memcpy(p->thread.regs.regs.mode.skas.xfp, exec_fpx_regs, 
-		       sizeof(p->thread.regs.regs.mode.skas.xfp));
+	  	memcpy(p->thread.regs.regs.skas.regs, exec_regs, 
+		       sizeof(p->thread.regs.regs.skas.regs));
+		memcpy(p->thread.regs.regs.skas.fp, exec_fp_regs, 
+		       sizeof(p->thread.regs.regs.skas.fp));
+	  	memcpy(p->thread.regs.regs.skas.xfp, exec_fpx_regs, 
+		       sizeof(p->thread.regs.regs.skas.xfp));
                 p->thread.request.u.thread = current->thread.request.u.thread;
 		handler = new_thread_handler;
 	}

arch/um/kernel/skas/sys-i386/sigcontext.c

@@ -15,7 +15,7 @@
 
 extern int userspace_pid;
 
-int copy_sc_from_user_skas(struct uml_pt_regs *regs, void *from_ptr)
+int copy_sc_from_user_skas(union uml_pt_regs *regs, void *from_ptr)
 {
   	struct sigcontext sc, *from = from_ptr;
 	unsigned long fpregs[FP_FRAME_SIZE];
@@ -26,26 +26,26 @@ int copy_sc_from_user_skas(struct uml_pt_regs *regs, void *from_ptr)
 	if(err)
 		return(err);
 
-	regs->mode.skas.regs[GS] = sc.gs;
-	regs->mode.skas.regs[FS] = sc.fs;
-	regs->mode.skas.regs[ES] = sc.es;
-	regs->mode.skas.regs[DS] = sc.ds;
-	regs->mode.skas.regs[EDI] = sc.edi;
-	regs->mode.skas.regs[ESI] = sc.esi;
-	regs->mode.skas.regs[EBP] = sc.ebp;
-	regs->mode.skas.regs[UESP] = sc.esp;
-	regs->mode.skas.regs[EBX] = sc.ebx;
-	regs->mode.skas.regs[EDX] = sc.edx;
-	regs->mode.skas.regs[ECX] = sc.ecx;
-	regs->mode.skas.regs[EAX] = sc.eax;
-	regs->mode.skas.regs[EIP] = sc.eip;
-	regs->mode.skas.regs[CS] = sc.cs;
-	regs->mode.skas.regs[EFL] = sc.eflags;
-	regs->mode.skas.regs[UESP] = sc.esp_at_signal;
-	regs->mode.skas.regs[SS] = sc.ss;
-	regs->mode.skas.fault_addr = sc.cr2;
-	regs->mode.skas.fault_type = FAULT_WRITE(sc.err);
-	regs->mode.skas.trap_type = sc.trapno;
+	regs->skas.regs[GS] = sc.gs;
+	regs->skas.regs[FS] = sc.fs;
+	regs->skas.regs[ES] = sc.es;
+	regs->skas.regs[DS] = sc.ds;
+	regs->skas.regs[EDI] = sc.edi;
+	regs->skas.regs[ESI] = sc.esi;
+	regs->skas.regs[EBP] = sc.ebp;
+	regs->skas.regs[UESP] = sc.esp;
+	regs->skas.regs[EBX] = sc.ebx;
+	regs->skas.regs[EDX] = sc.edx;
+	regs->skas.regs[ECX] = sc.ecx;
+	regs->skas.regs[EAX] = sc.eax;
+	regs->skas.regs[EIP] = sc.eip;
+	regs->skas.regs[CS] = sc.cs;
+	regs->skas.regs[EFL] = sc.eflags;
+	regs->skas.regs[UESP] = sc.esp_at_signal;
+	regs->skas.regs[SS] = sc.ss;
+	regs->skas.fault_addr = sc.cr2;
+	regs->skas.fault_type = FAULT_WRITE(sc.err);
+	regs->skas.trap_type = sc.trapno;
 
 	err = ptrace(PTRACE_SETFPREGS, userspace_pid, 0, fpregs);
 	if(err < 0){
@@ -57,7 +57,7 @@ int copy_sc_from_user_skas(struct uml_pt_regs *regs, void *from_ptr)
 	return(0);
 }
 
-int copy_sc_to_user_skas(void *to_ptr, struct uml_pt_regs *regs, 
+int copy_sc_to_user_skas(void *to_ptr, void *fp, union uml_pt_regs *regs, 
 			 unsigned long fault_addr, int fault_type)
 {
   	struct sigcontext sc, *to = to_ptr;
@@ -65,26 +65,26 @@ int copy_sc_to_user_skas(void *to_ptr, struct uml_pt_regs *regs,
 	unsigned long fpregs[FP_FRAME_SIZE];
 	int err;
 
-	sc.gs = regs->mode.skas.regs[GS];
-	sc.fs = regs->mode.skas.regs[FS];
-	sc.es = regs->mode.skas.regs[ES];
-	sc.ds = regs->mode.skas.regs[DS];
-	sc.edi = regs->mode.skas.regs[EDI];
-	sc.esi = regs->mode.skas.regs[ESI];
-	sc.ebp = regs->mode.skas.regs[EBP];
-	sc.esp = regs->mode.skas.regs[UESP];
-	sc.ebx = regs->mode.skas.regs[EBX];
-	sc.edx = regs->mode.skas.regs[EDX];
-	sc.ecx = regs->mode.skas.regs[ECX];
-	sc.eax = regs->mode.skas.regs[EAX];
-	sc.eip = regs->mode.skas.regs[EIP];
-	sc.cs = regs->mode.skas.regs[CS];
-	sc.eflags = regs->mode.skas.regs[EFL];
-	sc.esp_at_signal = regs->mode.skas.regs[UESP];
-	sc.ss = regs->mode.skas.regs[SS];
+	sc.gs = regs->skas.regs[GS];
+	sc.fs = regs->skas.regs[FS];
+	sc.es = regs->skas.regs[ES];
+	sc.ds = regs->skas.regs[DS];
+	sc.edi = regs->skas.regs[EDI];
+	sc.esi = regs->skas.regs[ESI];
+	sc.ebp = regs->skas.regs[EBP];
+	sc.esp = regs->skas.regs[UESP];
+	sc.ebx = regs->skas.regs[EBX];
+	sc.edx = regs->skas.regs[EDX];
+	sc.ecx = regs->skas.regs[ECX];
+	sc.eax = regs->skas.regs[EAX];
+	sc.eip = regs->skas.regs[EIP];
+	sc.cs = regs->skas.regs[CS];
+	sc.eflags = regs->skas.regs[EFL];
+	sc.esp_at_signal = regs->skas.regs[UESP];
+	sc.ss = regs->skas.regs[SS];
 	sc.cr2 = fault_addr;
 	sc.err = TO_SC_ERR(fault_type);
-	sc.trapno = regs->mode.skas.trap_type;
+	sc.trapno = regs->skas.trap_type;
 
 	err = ptrace(PTRACE_GETFPREGS, userspace_pid, 0, fpregs);
 	if(err < 0){
@@ -92,7 +92,8 @@ int copy_sc_to_user_skas(void *to_ptr, struct uml_pt_regs *regs,
 		       "errno = %d\n", errno);
 		return(1);
 	}
-	to_fp = (struct _fpstate *)((unsigned long) to + sizeof(*to));
+	to_fp = (struct _fpstate *) 
+		(fp ? (unsigned long) fp : ((unsigned long) to + sizeof(*to)));
 	sc.fpstate = to_fp;
 
 	if(err)

arch/um/kernel/skas/syscall_kern.c

@@ -21,7 +21,7 @@ long execute_syscall_skas(void *r)
 
 	current->thread.nsyscalls++;
 	nsyscalls++;
-	syscall = regs->regs.syscall;
+	syscall = UPT_SYSCALL_NR(&regs->regs);
 
 	if((syscall >= NR_syscalls) || (syscall < 0))
 		res = -ENOSYS;

arch/um/kernel/skas/syscall_user.c

@@ -15,18 +15,17 @@
 #define ERESTARTNOINTR	513
 #define ERESTARTNOHAND	514
 
-void handle_syscall(struct uml_pt_regs *regs)
+void handle_syscall(union uml_pt_regs *regs)
 {
 	long result;
 	int index;
 
-	host_to_regs(regs);
 	index = record_syscall_start(UPT_SYSCALL_NR(regs));
 
 	syscall_trace();
 	result = execute_syscall(regs);
 
-	REGS_SET_SYSCALL_RETURN(regs->mode.skas.regs, result);
+	REGS_SET_SYSCALL_RETURN(regs->skas.regs, result);
 	if((result == -ERESTARTNOHAND) || (result == -ERESTARTSYS) || 
 	   (result == -ERESTARTNOINTR))
 		do_signal(result);

arch/um/kernel/skas/tlb.c

@@ -134,9 +134,8 @@ void flush_tlb_range_skas(struct vm_area_struct *vma, unsigned long start,
 
 void flush_tlb_mm_skas(struct mm_struct *mm)
 {
-	if(mm == NULL)
 	flush_tlb_kernel_vm_skas();
-	else fix_range(mm, 0, host_task_size, 0);
+	fix_range(mm, 0, host_task_size, 0);
 }
 
 void force_flush_all_skas(void)

arch/um/kernel/skas/trap_user.c

@@ -13,41 +13,40 @@
 #include "task.h"
 #include "sigcontext.h"
 
-void sig_handler_common_skas(int sig, struct sigcontext *sc)
+void sig_handler_common_skas(int sig, void *sc_ptr)
 {
-	struct uml_pt_regs save_regs, *r;
+	struct sigcontext *sc = sc_ptr;
+	struct skas_regs *r;
 	struct signal_info *info;
 	int save_errno = errno;
 
-	r = (struct uml_pt_regs *) TASK_REGS(get_current());
-	save_regs = *r;
+	r = &TASK_REGS(get_current())->skas;
 	r->is_user = 0;
-	r->mode.skas.fault_addr = SC_FAULT_ADDR(sc);
-	r->mode.skas.fault_type = SC_FAULT_TYPE(sc);
-	r->mode.skas.trap_type = SC_TRAP_TYPE(sc);
+	r->fault_addr = SC_FAULT_ADDR(sc);
+	r->fault_type = SC_FAULT_TYPE(sc);
+	r->trap_type = SC_TRAP_TYPE(sc);
 
 	change_sig(SIGUSR1, 1);
 	info = &sig_info[sig];
 	if(!info->is_irq) unblock_signals();
 
-	(*info->handler)(sig, r);
+	(*info->handler)(sig, (union uml_pt_regs *) r);
 
-	*r = save_regs;
 	errno = save_errno;
 }
 
 extern int missed_ticks[];
 
-void user_signal(int sig, struct uml_pt_regs *regs)
+void user_signal(int sig, union uml_pt_regs *regs)
 {
 	struct signal_info *info;
 
 	if(sig == SIGVTALRM)
 		missed_ticks[cpu()]++;
-	regs->is_user = 1;
-	regs->mode.skas.fault_addr = 0;
-	regs->mode.skas.fault_type = 0;
-	regs->mode.skas.trap_type = 0;
+	regs->skas.is_user = 1;
+	regs->fault_addr = 0;
+	regs->skas.fault_type = 0;
+	regs->skas.trap_type = 0;
 	info = &sig_info[sig];
 	(*info->handler)(sig, regs);
 

arch/um/kernel/time_kern.c

@@ -37,7 +37,7 @@ int timer_irq_inited = 0;
  */
 int __attribute__ ((__section__ (".unprotected"))) missed_ticks[NR_CPUS];
 
-void timer_irq(struct uml_pt_regs *regs)
+void timer_irq(union uml_pt_regs *regs)
 {
 	int cpu = current->thread_info->cpu, ticks = missed_ticks[cpu];
 
@@ -50,7 +50,9 @@ void boot_timer_handler(int sig)
 {
 	struct pt_regs regs;
 
-	regs.regs.is_user = 0;
+	CHOOSE_MODE((void) 
+		    (UPT_SC(&regs.regs) = (struct sigcontext *) (&sig + 1)),
+		    (void) (regs.regs.skas.is_user = 0));
 	do_timer(&regs);
 }
 
@@ -118,7 +120,7 @@ void __const_udelay(um_udelay_t usecs)
 	for(i=0;i<n;i++) ;
 }
 
-void timer_handler(int sig, struct uml_pt_regs *regs)
+void timer_handler(int sig, union uml_pt_regs *regs)
 {
 #ifdef CONFIG_SMP
 	update_process_times(user_context(UPT_SP(regs)));

arch/um/kernel/trap_kern.c

@@ -164,14 +164,15 @@ void bad_segv(unsigned long address, unsigned long ip, int is_write)
 	force_sig_info(SIGSEGV, &si, current);
 }
 
-void relay_signal(int sig, struct uml_pt_regs *regs)
+void relay_signal(int sig, union uml_pt_regs *regs)
 {
 	if(arch_handle_signal(sig, regs)) return;
-	if(!regs->is_user) panic("Kernel mode signal %d", sig);
+	if(!UPT_IS_USER(regs))
+		panic("Kernel mode signal %d", sig);
 	force_sig(sig, current);
 }
 
-void bus_handler(int sig, struct uml_pt_regs *regs)
+void bus_handler(int sig, union uml_pt_regs *regs)
 {
 	if(current->thread.fault_catcher != NULL)
 		do_longjmp(current->thread.fault_catcher, 1);

arch/um/kernel/trap_user.c

@@ -48,11 +48,11 @@ struct {
 	int is_user;
 } segfault_record[1024];
 
-void segv_handler(int sig, struct uml_pt_regs *regs)
+void segv_handler(int sig, union uml_pt_regs *regs)
 {
 	int index, max;
 
-	if(regs->is_user && !UPT_SEGV_IS_FIXABLE(regs)){
+	if(UPT_IS_USER(regs) && !UPT_SEGV_IS_FIXABLE(regs)){
 		bad_segv(UPT_FAULT_ADDR(regs), UPT_IP(regs), 
 			 UPT_FAULT_WRITE(regs));
 		return;
@@ -65,35 +65,35 @@ void segv_handler(int sig, struct uml_pt_regs *regs)
 	segfault_record[index].pid = os_getpid();
 	segfault_record[index].is_write = UPT_FAULT_WRITE(regs);
 	segfault_record[index].sp = UPT_SP(regs);
-	segfault_record[index].is_user = regs->is_user;
+	segfault_record[index].is_user = UPT_IS_USER(regs);
 	segv(UPT_FAULT_ADDR(regs), UPT_IP(regs), UPT_FAULT_WRITE(regs),
-	     regs->is_user, regs);
+	     UPT_IS_USER(regs), regs);
 }
 
-void usr2_handler(int sig, struct uml_pt_regs *regs)
+void usr2_handler(int sig, union uml_pt_regs *regs)
 {
 	CHOOSE_MODE(syscall_handler_tt(sig, regs), (void) 0);
 }
 
 struct signal_info sig_info[] = {
-	[ SIGTRAP ] { handler :		relay_signal,
-		      is_irq :		0 },
-	[ SIGFPE ] { handler :		relay_signal,
-		     is_irq :		0 },
-	[ SIGILL ] { handler :		relay_signal,
-		     is_irq :		0 },
-	[ SIGBUS ] { handler :		bus_handler,
-		     is_irq :		0 },
-	[ SIGSEGV] { handler :		segv_handler,
-		     is_irq :		0 },
-	[ SIGIO ] { handler :		sigio_handler,
-		    is_irq :		1 },
-	[ SIGVTALRM ] { handler :	timer_handler,
-			is_irq :	1 },
-        [ SIGALRM ] { handler :         timer_handler,
-                      is_irq :          1 },
-	[ SIGUSR2 ] { handler :		usr2_handler,
-		      is_irq :		0 },
+	[ SIGTRAP ] { .handler 		= relay_signal,
+		      .is_irq 		= 0 },
+	[ SIGFPE ] { .handler 		= relay_signal,
+		     .is_irq 		= 0 },
+	[ SIGILL ] { .handler 		= relay_signal,
+		     .is_irq 		= 0 },
+	[ SIGBUS ] { .handler 		= bus_handler,
+		     .is_irq 		= 0 },
+	[ SIGSEGV] { .handler 		= segv_handler,
+		     .is_irq 		= 0 },
+	[ SIGIO ] { .handler 		= sigio_handler,
+		    .is_irq 		= 1 },
+	[ SIGVTALRM ] { .handler 	= timer_handler,
+			.is_irq 	= 1 },
+        [ SIGALRM ] { .handler          = timer_handler,
+                      .is_irq           = 1 },
+	[ SIGUSR2 ] { .handler 		= usr2_handler,
+		      .is_irq 		= 0 },
 };
 
 void sig_handler(int sig, struct sigcontext sc)

arch/um/kernel/tt/gdb.c

@@ -74,16 +74,16 @@ static void *xterm_data;
 static int xterm_fd;
 
 extern void *xterm_init(char *, int, struct chan_opts *);
-extern int xterm_open(int, int, int, void *);
+extern int xterm_open(int, int, int, void *, char **);
 extern void xterm_close(int, void *);
 
 int open_gdb_chan(void)
 {
-	char stack[UM_KERN_PAGE_SIZE];
+	char stack[UM_KERN_PAGE_SIZE], *dummy;
 
 	opts.tramp_stack = (unsigned long) stack;
 	xterm_data = xterm_init("", 0, &opts);
-	xterm_fd = xterm_open(1, 1, 1, xterm_data);
+	xterm_fd = xterm_open(1, 1, 1, xterm_data, &dummy);
 	return(xterm_fd);
 }
 

arch/um/kernel/tt/include/mode.h

@@ -13,9 +13,10 @@ extern int tracing_pid;
 extern int tracer(int (*init_proc)(void *), void *sp);
 extern void user_time_init_tt(void);
 extern int copy_sc_from_user_tt(void *to_ptr, void *from_ptr, void *data);
-extern int copy_sc_to_user_tt(void *to_ptr, void *from_ptr, void *data);
-extern void sig_handler_common_tt(int sig, struct sigcontext *sc);
-extern void syscall_handler_tt(int sig, struct uml_pt_regs *regs);
+extern int copy_sc_to_user_tt(void *to_ptr, void *fp, void *from_ptr, 
+			      void *data);
+extern void sig_handler_common_tt(int sig, void *sc);
+extern void syscall_handler_tt(int sig, union uml_pt_regs *regs);
 extern void reboot_tt(void);
 extern void halt_tt(void);
 extern int is_tracer_winch(int pid, int fd, void *data);

arch/um/kernel/tt/include/mode_kern.h

@@ -33,7 +33,6 @@ extern void before_mem_tt(unsigned long brk_start);
 extern unsigned long set_task_sizes_tt(int arg, unsigned long *host_size_out, 
 				       unsigned long *task_size_out);
 extern int start_uml_tt(void);
-extern struct page *arch_validate_tt(struct page *page, int mask, int order);
 extern int external_pid_tt(struct task_struct *task);
 extern int thread_pid_tt(struct task_struct *task);
 

arch/um/kernel/tt/include/tt.h

@@ -26,10 +26,11 @@ extern void set_tracing(void *t, int tracing);
 extern int is_tracing(void *task);
 extern int singlestepping_tt(void *t);
 extern void clear_singlestep(void *t);
-extern void syscall_handler(int sig, struct uml_pt_regs *regs);
+extern void syscall_handler(int sig, union uml_pt_regs *regs);
 extern void exit_kernel(int pid, void *task);
 extern int do_syscall(void *task, int pid);
 extern int is_valid_pid(int pid);
+extern void remap_data(void *segment_start, void *segment_end, int w);
 
 #endif
 

arch/um/kernel/tt/include/uaccess.h

@@ -12,6 +12,7 @@
 #include "asm/errno.h"
 #include "asm/current.h"
 #include "asm/a.out.h"
+#include "uml_uaccess.h"
 
 #define ABOVE_KMEM (16 * 1024 * 1024)
 
@@ -51,9 +52,6 @@ static inline int copy_from_user_tt(void *to, const void *from, int n)
 				   &current->thread.fault_catcher) : n);
 }
 
-extern int __do_copy_to_user(void *to, const void *from, int n,
-				  void **fault_addr, void **fault_catcher);
-
 static inline int copy_to_user_tt(void *to, const void *from, int n)
 {
 	return(access_ok_tt(VERIFY_WRITE, to, n) ?

arch/um/kernel/tt/mem.c

@@ -39,32 +39,6 @@ unsigned long set_task_sizes_tt(int arg, unsigned long *host_size_out,
 	return(START);
 }
 
-struct page *arch_validate_tt(struct page *page, int mask, int order)
-{
-        unsigned long addr, zero = 0;
-        int i;
-
- again:
-        if(page == NULL) return(page);
-        if(PageHighMem(page)) return(page);
-
-        addr = (unsigned long) page_address(page);
-        for(i = 0; i < (1 << order); i++){
-                current->thread.fault_addr = (void *) addr;
-                if(__do_copy_to_user((void *) addr, &zero, 
-                                     sizeof(zero),
-                                     &current->thread.fault_addr,
-                                     &current->thread.fault_catcher)){
-                        if(!(mask & __GFP_WAIT)) return(NULL);
-                        else break;
-                }
-                addr += PAGE_SIZE;
-        }
-        if(i == (1 << order)) return(page);
-        page = alloc_pages(mask, order);
-        goto again;
-}
-
 /*
  * Overrides for Emacs so that we follow Linus's tabbing style.
  * Emacs will notice this stuff at the end of the file and automatically

arch/um/kernel/tt/process_kern.c

@@ -111,8 +111,6 @@ void exit_thread_tt(void)
 	close(current->thread.mode.tt.switch_pipe[1]);
 }
 
-extern void schedule_tail(struct task_struct *prev);
-
 static void new_thread_handler(int sig)
 {
 	int (*fn)(void *);
@@ -120,7 +118,7 @@ static void new_thread_handler(int sig)
 
 	fn = current->thread.request.u.thread.proc;
 	arg = current->thread.request.u.thread.arg;
-	current->thread.regs.regs.mode.tt = (void *) (&sig + 1);
+	UPT_SC(&current->thread.regs.regs) = (void *) (&sig + 1);
 	suspend_new_thread(current->thread.mode.tt.switch_pipe[0]);
 
 	block_signals();
@@ -160,7 +158,7 @@ static int new_thread_proc(void *stack)
 
 void finish_fork_handler(int sig)
 {
-	current->thread.regs.regs.mode.tt = (void *) (&sig + 1);
+ 	UPT_SC(&current->thread.regs.regs) = (void *) (&sig + 1);
 	suspend_new_thread(current->thread.mode.tt.switch_pipe[0]);
 
 #ifdef CONFIG_SMP	
@@ -168,6 +166,7 @@ void finish_fork_handler(int sig)
 #endif
 	enable_timer();
 	change_sig(SIGVTALRM, 1);
+ 	sti();
 	force_flush_all();
 	if(current->mm != current->parent->mm)
 		protect_memory(uml_reserved, high_physmem - uml_reserved, 1, 
@@ -187,6 +186,7 @@ int fork_tramp(void *stack)
 {
 	int sig = sigusr1;
 
+	cli();
 	init_new_thread_stack(stack, finish_fork_handler);
 
 	kill(os_getpid(), sig);
@@ -232,10 +232,10 @@ int copy_thread_tt(int nr, unsigned long clone_flags, unsigned long sp,
 	}
 
 	if(current->thread.forking){
-		sc_to_sc(p->thread.regs.regs.mode.tt, 
-			 current->thread.regs.regs.mode.tt);
-		SC_SET_SYSCALL_RETURN(p->thread.regs.regs.mode.tt, 0);
-		if(sp != 0) SC_SP(p->thread.regs.regs.mode.tt) = sp;
+		sc_to_sc(UPT_SC(&p->thread.regs.regs), 
+			 UPT_SC(&current->thread.regs.regs));
+		SC_SET_SYSCALL_RETURN(UPT_SC(&p->thread.regs.regs), 0);
+		if(sp != 0) SC_SP(UPT_SC(&p->thread.regs.regs)) = sp;
 	}
 	p->thread.mode.tt.extern_pid = new_pid;
 

arch/um/kernel/tt/sys-i386/sigcontext.c

@@ -29,14 +29,15 @@ int copy_sc_from_user_tt(void *to_ptr, void *from_ptr, void *data)
 	return(err);
 }
 
-int copy_sc_to_user_tt(void *to_ptr, void *from_ptr, void *data)
+int copy_sc_to_user_tt(void *to_ptr, void *fp, void *from_ptr, void *data)
 {
 	struct arch_frame_data *arch = data;
 	struct sigcontext *to = to_ptr, *from = from_ptr;
 	struct _fpstate *to_fp, *from_fp;
 	int err;
 
-	to_fp = (struct _fpstate *)((unsigned long) to + sizeof(*to));
+	to_fp = (struct _fpstate *) 
+		(fp ? (unsigned long) fp : ((unsigned long) to + sizeof(*to)));
 	from_fp = from->fpstate;
 	err = copy_to_user_proc(to, from, sizeof(*to));
 	if(from_fp != NULL){

arch/um/kernel/tt/syscall_kern.c

@@ -20,29 +20,32 @@ static inline int check_area(void *ptr, int size)
 
 static int check_readlink(struct pt_regs *regs)
 {
-	return(check_area((void *) regs->regs.args[1], regs->regs.args[2]));
+	return(check_area((void *) UPT_SYSCALL_ARG1(&regs->regs),
+			  UPT_SYSCALL_ARG2(&regs->regs)));
 }
 
 static int check_utime(struct pt_regs *regs)
 {
-	return(check_area((void *) regs->regs.args[1],
+	return(check_area((void *) UPT_SYSCALL_ARG1(&regs->regs),
 			  sizeof(struct utimbuf)));
 }
 
 static int check_oldstat(struct pt_regs *regs)
 {
-	return(check_area((void *) regs->regs.args[1], 
+	return(check_area((void *) UPT_SYSCALL_ARG1(&regs->regs), 
 			  sizeof(struct __old_kernel_stat)));
 }
 
 static int check_stat(struct pt_regs *regs)
 {
-	return(check_area((void *) regs->regs.args[1], sizeof(struct stat)));
+	return(check_area((void *) UPT_SYSCALL_ARG1(&regs->regs), 
+			  sizeof(struct stat)));
 }
 
 static int check_stat64(struct pt_regs *regs)
 {
-	return(check_area((void *) regs->regs.args[1], sizeof(struct stat64)));
+	return(check_area((void *) UPT_SYSCALL_ARG1(&regs->regs), 
+			  sizeof(struct stat64)));
 }
 
 struct bogus {
@@ -90,7 +93,7 @@ struct bogus this_is_bogus[256] = {
 
 static int check_bogosity(struct pt_regs *regs)
 {
-	struct bogus *bogon = &this_is_bogus[regs->regs.syscall];
+	struct bogus *bogon = &this_is_bogus[UPT_SYSCALL_NR(&regs->regs)];
 
 	if(!bogon->kernel_ds) return(0);
 	if(bogon->check_params && (*bogon->check_params)(regs))
@@ -109,7 +112,7 @@ long execute_syscall_tt(void *r)
 
 	current->thread.nsyscalls++;
 	nsyscalls++;
-	syscall = regs->regs.syscall;
+	syscall = UPT_SYSCALL_NR(&regs->regs);
 
 	if((syscall >= NR_syscalls) || (syscall < 0))
 		res = -ENOSYS;

arch/um/kernel/tt/syscall_user.c

@@ -22,15 +22,14 @@
 #define ERESTARTNOINTR	513
 #define ERESTARTNOHAND	514
 
-void syscall_handler_tt(int sig, struct uml_pt_regs *regs)
+void syscall_handler_tt(int sig, union uml_pt_regs *regs)
 {
 	void *sc;
 	long result;
 	int index, syscall;
 
-	syscall = regs->syscall;
-	sc = regs->mode.tt;
-	sc_to_regs(regs, sc, syscall);
+	syscall = UPT_SYSCALL_NR(regs);
+	sc = UPT_SC(regs);
 	SC_START_SYSCALL(sc);
 
 	index = record_syscall_start(syscall);
@@ -40,7 +39,7 @@ void syscall_handler_tt(int sig, struct uml_pt_regs *regs)
 	/* regs->sc may have changed while the system call ran (there may
 	 * have been an interrupt or segfault), so it needs to be refreshed.
 	 */
-	regs->mode.tt = sc;
+	UPT_SC(regs) = sc;
 
 	SC_SET_SYSCALL_RETURN(sc, result);
 	if((result == -ERESTARTNOHAND) || (result == -ERESTARTSYS) || 
@@ -54,7 +53,7 @@ void syscall_handler_tt(int sig, struct uml_pt_regs *regs)
 int do_syscall(void *task, int pid)
 {
 	unsigned long proc_regs[FRAME_SIZE];
-	struct uml_pt_regs *regs;
+	union uml_pt_regs *regs;
 	int syscall;
 
 	if(ptrace_getregs(pid, proc_regs) < 0)

arch/um/kernel/tt/trap_user.c

@@ -14,26 +14,27 @@
 #include "task.h"
 #include "tt.h"
 
-void sig_handler_common_tt(int sig, struct sigcontext *sc)
+void sig_handler_common_tt(int sig, void *sc_ptr)
 {
-	struct uml_pt_regs save_regs, *r;
+	struct sigcontext *sc = sc_ptr;
+	struct tt_regs save_regs, *r;
 	struct signal_info *info;
 	int save_errno = errno, is_user;
 
 	unprotect_kernel_mem();
 
-	r = (struct uml_pt_regs *) TASK_REGS(get_current());
+	r = &TASK_REGS(get_current())->tt;
 	save_regs = *r;
 	is_user = user_context(SC_SP(sc));
-	r->is_user = is_user;
-	r->mode.tt = sc;
-	if(sig != SIGUSR2) r->syscall = -1;
+	r->sc = sc;
+	if(sig != SIGUSR2) 
+		r->syscall = -1;
 
 	change_sig(SIGUSR1, 1);
 	info = &sig_info[sig];
 	if(!info->is_irq) unblock_signals();
 
-	(*info->handler)(sig, r);
+	(*info->handler)(sig, (union uml_pt_regs *) r);
 
 	if(is_user){
 		interrupt_end();

arch/um/kernel/tt/uaccess_user.c

@@ -7,34 +7,7 @@
 #include <setjmp.h>
 #include <string.h>
 #include "user_util.h"
-
-static unsigned long __do_user_copy(void *to, const void *from, int n,
-				    void **fault_addr, void **fault_catcher,
-				    void (*op)(void *to, const void *from,
-					       int n), int *faulted_out)
-{
-	unsigned long *faddrp = (unsigned long *) fault_addr, ret;
-
-	jmp_buf jbuf;
-	*fault_catcher = &jbuf;
-	if(setjmp(jbuf) == 0){
-		(*op)(to, from, n);
-		ret = 0;
-		*faulted_out = 0;
-	} 
-	else {
-		ret = *faddrp;
-		*faulted_out = 1;
-	}
-	*fault_addr = NULL;
-	*fault_catcher = NULL;
-	return ret;
-}
-
-static void __do_copy(void *to, const void *from, int n)
-{
-	memcpy(to, from, n);
-}	
+#include "uml_uaccess.h"
 
 int __do_copy_from_user(void *to, const void *from, int n,
 			void **fault_addr, void **fault_catcher)
@@ -48,19 +21,6 @@ int __do_copy_from_user(void *to, const void *from, int n,
 	else return(n - (fault - (unsigned long) from));
 }
 
-
-int __do_copy_to_user(void *to, const void *from, int n,
-		      void **fault_addr, void **fault_catcher)
-{
-	unsigned long fault;
-	int faulted;
-
-	fault = __do_user_copy(to, from, n, fault_addr, fault_catcher,
-			       __do_copy, &faulted);
-	if(!faulted) return(0);
-	else return(n - (fault - (unsigned long) to));
-}
-
 static void __do_strncpy(void *dst, const void *src, int count)
 {
 	strncpy(dst, src, count);

arch/um/kernel/uaccess_user.c

+/* 
+ * Copyright (C) 2001 Chris Emerson (cemerson@chiark.greenend.org.uk)
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <setjmp.h>
+#include <string.h>
+
+/* These are here rather than tt/uaccess.c because skas mode needs them in
+ * order to do SIGBUS recovery when a tmpfs mount runs out of room.
+ */
+
+unsigned long __do_user_copy(void *to, const void *from, int n,
+			     void **fault_addr, void **fault_catcher,
+			     void (*op)(void *to, const void *from,
+					int n), int *faulted_out)
+{
+	unsigned long *faddrp = (unsigned long *) fault_addr, ret;
+
+	jmp_buf jbuf;
+	*fault_catcher = &jbuf;
+	if(setjmp(jbuf) == 0){
+		(*op)(to, from, n);
+		ret = 0;
+		*faulted_out = 0;
+	} 
+	else {
+		ret = *faddrp;
+		*faulted_out = 1;
+	}
+	*fault_addr = NULL;
+	*fault_catcher = NULL;
+	return ret;
+}
+
+void __do_copy(void *to, const void *from, int n)
+{
+	memcpy(to, from, n);
+}	
+
+
+int __do_copy_to_user(void *to, const void *from, int n,
+		      void **fault_addr, void **fault_catcher)
+{
+	unsigned long fault;
+	int faulted;
+
+	fault = __do_user_copy(to, from, n, fault_addr, fault_catcher,
+			       __do_copy, &faulted);
+	if(!faulted) return(0);
+	else return(n - (fault - (unsigned long) to));
+}
+
+/*
+ * 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:
+ */

arch/um/sys-i386/bugs.c

@@ -117,7 +117,7 @@ void arch_check_bugs(void)
 	if(check_cpu_feature("xmm", &have_it)) cpu_has_xmm = have_it;
 }
 
-int arch_handle_signal(int sig, struct uml_pt_regs *regs)
+int arch_handle_signal(int sig, union uml_pt_regs *regs)
 {
 	unsigned long ip;
 

arch/um/sys-i386/sigcontext.c

@@ -21,7 +21,7 @@ int sc_size(void *data)
 void sc_to_sc(void *to_ptr, void *from_ptr)
 {
 	struct sigcontext *to = to_ptr, *from = from_ptr;
-	int size = sizeof(*to) + signal_frame_sc.arch.fpstate_size;
+	int size = sizeof(*to) + signal_frame_sc.common.arch.fpstate_size;
 
 	memcpy(to, from, size);
 	if(from->fpstate != NULL) to->fpstate = (struct _fpstate *) (to + 1);

arch/um/util/mk_task_kern.c

@@ -9,7 +9,7 @@ extern void print_tail(void);
 int main(int argc, char **argv)
 {
   print_head();
-  print_ptr("TASK_REGS", "struct uml_pt_regs", 
+  print_ptr("TASK_REGS", "union uml_pt_regs", 
 	    offsetof(struct task_struct, thread.regs));
   print("TASK_PID", "int", offsetof(struct task_struct, pid));
   print_tail();

include/asm-um/archparam-i386.h

@@ -48,7 +48,7 @@ typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 	/* fake once used fs and gs selectors? */	\
 	pr_reg[9] = PT_REGS_DS(regs);		\
 	pr_reg[10] = PT_REGS_DS(regs);		\
-	pr_reg[11] = regs->regs.syscall;	\
+	pr_reg[11] = PT_REGS_SYSCALL_NR(regs);	\
 	pr_reg[12] = PT_REGS_IP(regs);		\
 	pr_reg[13] = PT_REGS_CS(regs);		\
 	pr_reg[14] = PT_REGS_EFLAGS(regs);	\

include/asm-um/ptrace-generic.h

@@ -9,7 +9,7 @@
 #ifndef __ASSEMBLY__
 
 #include "linux/config.h"
-#include "skas_ptrace.h"
+
 #include "asm/current.h"
 
 #define pt_regs pt_regs_subarch
@@ -23,9 +23,10 @@
 #undef instruction_pointer
 
 #include "sysdep/ptrace.h"
+#include "skas_ptrace.h"
 
 struct pt_regs {
-	struct uml_pt_regs regs;
+	union uml_pt_regs regs;
 };
 
 #define EMPTY_REGS { regs : EMPTY_UML_PT_REGS }

include/asm-um/ptrace-i386.h

@@ -6,6 +6,7 @@
 #ifndef __UM_PTRACE_I386_H
 #define __UM_PTRACE_I386_H
 
+#include "sysdep/ptrace.h"
 #include "asm/ptrace-generic.h"
 
 #define PT_REGS_EAX(r) UPT_EAX(&(r)->regs)
@@ -29,7 +30,7 @@
 #define PT_REGS_SYSCALL_RET(r) PT_REGS_EAX(r)
 #define PT_FIX_EXEC_STACK(sp) do ; while(0)
 
-#define user_mode(r) ((r)->regs.is_user)
+#define user_mode(r) UPT_IS_USER(&(r)->regs)
 
 #endif
 

include/asm-um/ucontext.h

+#ifndef _ASM_UM_UCONTEXT_H
+#define _ASM_UM_UCONTEXT_H
+
+#include "asm/arch/ucontext.h"
+
+#endif