um: start switching the references to host mcontext_t to its userland type

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>

7 files changed, 33 insertions, 26 deletions

diff --git a/arch/um/include/shared/process.h b/arch/um/include/shared/process.h
index 28215300fc69..2ba310e1b656 100644
--- a/arch/um/include/shared/process.h
+++ b/arch/um/include/shared/process.h
@@ -6,9 +6,4 @@
 #ifndef __PROCESS_H__
 #define __PROCESS_H__
 
-#include <signal.h>
-
-extern void sig_handler(int sig, struct sigcontext *sc);
-extern void alarm_handler(int sig, struct sigcontext *sc);
-
 #endif
diff --git a/arch/um/os-Linux/internal.h b/arch/um/os-Linux/internal.h
new file mode 100644
index 000000000000..2c3c3ecd8c01
--- /dev/null
+++ b/arch/um/os-Linux/internal.h
@@ -0,0 +1 @@
+void alarm_handler(int, mcontext_t *);
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index 08d306176995..07d9905e44ef 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -26,7 +26,7 @@ void (*sig_info[NSIG])(int, struct uml_pt_regs *) = {
         [SIGIO]         = sigio_handler,
         [SIGVTALRM]     = timer_handler };
 
-static void sig_handler_common(int sig, struct sigcontext *sc)
+static void sig_handler_common(int sig, mcontext_t *mc)
 {
         struct uml_pt_regs r;
         int save_errno = errno;
@@ -34,8 +34,8 @@ static void sig_handler_common(int sig, struct sigcontext *sc)
         r.is_user = 0;
         if (sig == SIGSEGV) {
                 /* For segfaults, we want the data from the sigcontext. */
-                copy_sc(&r, sc);
-                GET_FAULTINFO_FROM_SC(r.faultinfo, sc);
+                copy_sc(&r, (struct sigcontext *)mc);
+                GET_FAULTINFO_FROM_MC(r.faultinfo, mc);
         }
 
         /* enable signals if sig isn't IRQ signal */
@@ -62,7 +62,7 @@ static void sig_handler_common(int sig, struct sigcontext *sc)
 static int signals_enabled;
 static unsigned int signals_pending;
 
-void sig_handler(int sig, struct sigcontext *sc)
+void sig_handler(int sig, mcontext_t *mc)
 {
         int enabled;
 
@@ -74,23 +74,23 @@ void sig_handler(int sig, struct sigcontext *sc)
 
         block_signals();
 
-        sig_handler_common(sig, sc);
+        sig_handler_common(sig, mc);
 
         set_signals(enabled);
 }
 
-static void real_alarm_handler(struct sigcontext *sc)
+static void real_alarm_handler(mcontext_t *mc)
 {
         struct uml_pt_regs regs;
 
-        if (sc != NULL)
-                copy_sc(&regs, sc);
+        if (mc != NULL)
+                copy_sc(&regs, (struct sigcontext *)mc);
         regs.is_user = 0;
         unblock_signals();
         timer_handler(SIGVTALRM, &regs);
 }
 
-void alarm_handler(int sig, struct sigcontext *sc)
+void alarm_handler(int sig, mcontext_t *mc)
 {
         int enabled;
 
@@ -102,7 +102,7 @@ void alarm_handler(int sig, struct sigcontext *sc)
 
         block_signals();
 
-        real_alarm_handler(sc);
+        real_alarm_handler(mc);
         set_signals(enabled);
 }
 
@@ -121,7 +121,7 @@ void set_sigstack(void *sig_stack, int size)
                 panic("enabling signal stack failed, errno = %d\n", errno);
 }
 
-static void (*handlers[_NSIG])(int sig, struct sigcontext *sc) = {
+static void (*handlers[_NSIG])(int sig, mcontext_t *mc) = {
         [SIGSEGV] = sig_handler,
         [SIGBUS] = sig_handler,
         [SIGILL] = sig_handler,
@@ -133,8 +133,11 @@ static void (*handlers[_NSIG])(int sig, struct sigcontext *sc) = {
         [SIGVTALRM] = alarm_handler
 };
 
-static void handle_signal(int sig, struct sigcontext *sc)
+
+static void hard_handler(int sig, siginfo_t *info, void *p)
 {
+        struct ucontext *uc = p;
+        mcontext_t *mc = &uc->uc_mcontext;
         unsigned long pending = 1UL << sig;
 
         do {
@@ -160,7 +163,7 @@ static void handle_signal(int sig, struct sigcontext *sc)
                 while ((sig = ffs(pending)) != 0){
                         sig--;
                         pending &= ~(1 << sig);
-                        (*handlers[sig])(sig, sc);
+                        (*handlers[sig])(sig, mc);
                 }
 
                 /*
@@ -174,12 +177,6 @@ static void handle_signal(int sig, struct sigcontext *sc)
         } while (pending);
 }
 
-static void hard_handler(int sig, siginfo_t *info, void *p)
-{
-        struct ucontext *uc = p;
-        handle_signal(sig, (struct sigcontext *) &uc->uc_mcontext);
-}
-
 void set_handler(int sig)
 {
         struct sigaction action;
diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c
index 995ca304f1c9..910499d76a67 100644
--- a/arch/um/os-Linux/time.c
+++ b/arch/um/os-Linux/time.c
@@ -10,7 +10,7 @@
 #include <sys/time.h>
 #include "kern_util.h"
 #include "os.h"
-#include "process.h"
+#include "internal.h"
 
 int set_interval(void)
 {
diff --git a/arch/um/sys-x86/shared/sysdep/sigcontext_32.h b/arch/um/sys-x86/shared/sysdep/sigcontext_32.h
index aebc2dd61f0d..548c3cdb743b 100644
--- a/arch/um/sys-x86/shared/sysdep/sigcontext_32.h
+++ b/arch/um/sys-x86/shared/sysdep/sigcontext_32.h
@@ -22,4 +22,11 @@
                 (fi).trap_no = SC_TRAPNO(sc); \
         }
 
+#define GET_FAULTINFO_FROM_MC(fi, mc) \
+        { \
+                (fi).cr2 = (mc)->cr2; \
+                (fi).error_code = (mc)->gregs[REG_ERR]; \
+                (fi).trap_no = (mc)->gregs[REG_TRAPNO]; \
+        }
+
 #endif
diff --git a/arch/um/sys-x86/shared/sysdep/sigcontext_64.h b/arch/um/sys-x86/shared/sysdep/sigcontext_64.h
index 60d89a2fba06..5c4a6a359141 100644
--- a/arch/um/sys-x86/shared/sysdep/sigcontext_64.h
+++ b/arch/um/sys-x86/shared/sysdep/sigcontext_64.h
@@ -22,4 +22,11 @@
                 (fi).trap_no = SC_TRAPNO(sc); \
         }
 
+#define GET_FAULTINFO_FROM_MC(fi, mc) \
+        { \
+                (fi).cr2 = (mc)->gregs[REG_CR2]; \
+                (fi).error_code = (mc)->gregs[REG_ERR]; \
+                (fi).trap_no = (mc)->gregs[REG_TRAPNO]; \
+        }
+
 #endif
diff --git a/arch/um/sys-x86/stub_segv.c b/arch/um/sys-x86/stub_segv.c
index f62771cf236e..bd2eaf69103f 100644
--- a/arch/um/sys-x86/stub_segv.c
+++ b/arch/um/sys-x86/stub_segv.c
@@ -12,7 +12,7 @@ stub_segv_handler(int sig, siginfo_t *info, void *p)
 {
         struct ucontext *uc = p;
 
-        GET_FAULTINFO_FROM_SC(*((struct faultinfo *) STUB_DATA),
+        GET_FAULTINFO_FROM_MC(*((struct faultinfo *) STUB_DATA),
                               &uc->uc_mcontext);
         trap_myself();
 }