6 files changed, 55 insertions, 5 deletions

diff --git a/include/asm-sh/auxvec.h b/include/asm-sh/auxvec.h
index fc21e4db5881..1b6916e63e90 100644
--- a/include/asm-sh/auxvec.h
+++ b/include/asm-sh/auxvec.h
@@ -1,4 +1,18 @@
 #ifndef __ASM_SH_AUXVEC_H
 #define __ASM_SH_AUXVEC_H
 
+/*
+ * Architecture-neutral AT_ values in 0-17, leave some room
+ * for more of them.
+ */
+
+#ifdef CONFIG_VSYSCALL
+/*
+ * Only define this in the vsyscall case, the entry point to
+ * the vsyscall page gets placed here. The kernel will attempt
+ * to build a gate VMA we don't care about otherwise..
+ */
+#define AT_SYSINFO_EHDR         33
+#endif
+
 #endif /* __ASM_SH_AUXVEC_H */
diff --git a/include/asm-sh/elf.h b/include/asm-sh/elf.h
index cc8e5e767345..3a07ab40ac4d 100644
--- a/include/asm-sh/elf.h
+++ b/include/asm-sh/elf.h
@@ -121,4 +121,24 @@ extern int dump_task_fpu (struct task_struct *, elf_fpregset_t *);
 #define ELF_CORE_COPY_FPREGS(tsk, elf_fpregs) dump_task_fpu(tsk, elf_fpregs)
 #endif
 
+#ifdef CONFIG_VSYSCALL
+/* vDSO has arch_setup_additional_pages */
+#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
+struct linux_binprm;
+extern int arch_setup_additional_pages(struct linux_binprm *bprm,
+                                       int executable_stack);
+
+extern unsigned int vdso_enabled;
+extern void __kernel_vsyscall;
+
+#define VDSO_BASE               ((unsigned long)current->mm->context.vdso)
+#define VDSO_SYM(x)             (VDSO_BASE + (unsigned long)(x))
+
+#define ARCH_DLINFO                                             \
+do {                                                            \
+        if (vdso_enabled)                                       \
+                NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_BASE);        \
+} while (0)
+#endif /* CONFIG_VSYSCALL */
+
 #endif /* __ASM_SH_ELF_H */
diff --git a/include/asm-sh/mmu.h b/include/asm-sh/mmu.h
index 6383dc84501e..cf47df79bb94 100644
--- a/include/asm-sh/mmu.h
+++ b/include/asm-sh/mmu.h
@@ -11,7 +11,12 @@ typedef struct {
 #else
 
 /* Default "unsigned long" context */
-typedef unsigned long mm_context_t;
+typedef unsigned long mm_context_id_t;
+
+typedef struct {
+        mm_context_id_t id;
+        void *vdso;
+} mm_context_t;
 
 #endif /* CONFIG_MMU */
 
diff --git a/include/asm-sh/mmu_context.h b/include/asm-sh/mmu_context.h
index 87678ba8d6b6..c7088efe579a 100644
--- a/include/asm-sh/mmu_context.h
+++ b/include/asm-sh/mmu_context.h
@@ -49,7 +49,7 @@ get_mmu_context(struct mm_struct *mm)
         unsigned long mc = mmu_context_cache;
 
         /* Check if we have old version of context. */
-        if (((mm->context ^ mc) & MMU_CONTEXT_VERSION_MASK) == 0)
+        if (((mm->context.id ^ mc) & MMU_CONTEXT_VERSION_MASK) == 0)
                 /* It's up to date, do nothing */
                 return;
 
@@ -68,7 +68,7 @@ get_mmu_context(struct mm_struct *mm)
                 if (!mc)
                         mmu_context_cache = mc = MMU_CONTEXT_FIRST_VERSION;
         }
-        mm->context = mc;
+        mm->context.id = mc;
 }
 
 /*
@@ -78,7 +78,7 @@ get_mmu_context(struct mm_struct *mm)
 static __inline__ int init_new_context(struct task_struct *tsk,
                                        struct mm_struct *mm)
 {
-        mm->context = NO_CONTEXT;
+        mm->context.id = NO_CONTEXT;
 
         return 0;
 }
@@ -123,7 +123,7 @@ static __inline__ unsigned long get_asid(void)
 static __inline__ void activate_context(struct mm_struct *mm)
 {
         get_mmu_context(mm);
-        set_asid(mm->context & MMU_CONTEXT_ASID_MASK);
+        set_asid(mm->context.id & MMU_CONTEXT_ASID_MASK);
 }
 
 /* MMU_TTB can be used for optimizing the fault handling.
diff --git a/include/asm-sh/page.h b/include/asm-sh/page.h
index acf6977b4042..3d8dae31a6f6 100644
--- a/include/asm-sh/page.h
+++ b/include/asm-sh/page.h
@@ -117,5 +117,10 @@ typedef struct { unsigned long pgprot; } pgprot_t;
 #include <asm-generic/memory_model.h>
 #include <asm-generic/page.h>
 
+/* vDSO support */
+#ifdef CONFIG_VSYSCALL
+#define __HAVE_ARCH_GATE_AREA
+#endif
+
 #endif /* __KERNEL__ */
 #endif /* __ASM_SH_PAGE_H */
diff --git a/include/asm-sh/processor.h b/include/asm-sh/processor.h
index b7cba4e91a72..474773853cd1 100644
--- a/include/asm-sh/processor.h
+++ b/include/asm-sh/processor.h
@@ -276,5 +276,11 @@ static inline void prefetch(void *x)
 #define prefetchw(x)    prefetch(x)
 #endif
 
+#ifdef CONFIG_VSYSCALL
+extern int vsyscall_init(void);
+#else
+#define vsyscall_init() do { } while (0)
+#endif
+
 #endif /* __KERNEL__ */
 #endif /* __ASM_SH_PROCESSOR_H */