X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;ds=sidebyside;f=arch%2Fsparc64%2Fkernel%2Fsys_sparc.c;h=a53d4abb4b49de1193b6a21d1d7e10a96c8eba51;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=4c75f61372abad8378c1cb590953f944d7b7e2a2;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git

diff --git a/arch/sparc64/kernel/sys_sparc.c b/arch/sparc64/kernel/sys_sparc.c
index 4c75f6137..a53d4abb4 100644
--- a/arch/sparc64/kernel/sys_sparc.c
+++ b/arch/sparc64/kernel/sys_sparc.c
@@ -6,7 +6,6 @@
  * platform.
  */
 
-#include <linux/config.h>
 #include <linux/errno.h>
 #include <linux/types.h>
 #include <linux/sched.h>
@@ -25,25 +24,94 @@
 #include <linux/syscalls.h>
 #include <linux/ipc.h>
 #include <linux/personality.h>
+#include <linux/random.h>
 
 #include <asm/uaccess.h>
 #include <asm/ipc.h>
 #include <asm/utrap.h>
 #include <asm/perfctr.h>
+#include <asm/a.out.h>
+#include <asm/unistd.h>
 
 /* #define DEBUG_UNIMP_SYSCALL */
 
-/* XXX Make this per-binary type, this way we can detect the type of
- * XXX a binary.  Every Sparc executable calls this very early on.
- */
 asmlinkage unsigned long sys_getpagesize(void)
 {
 	return PAGE_SIZE;
 }
 
-#define COLOUR_ALIGN(addr,pgoff)		\
-	((((addr)+SHMLBA-1)&~(SHMLBA-1)) +	\
-	 (((pgoff)<<PAGE_SHIFT) & (SHMLBA-1)))
+#define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
+#define VA_EXCLUDE_END   (0xfffff80000000000UL + (1UL << 32UL))
+
+/* Does addr --> addr+len fall within 4GB of the VA-space hole or
+ * overflow past the end of the 64-bit address space?
+ */
+static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
+{
+	unsigned long va_exclude_start, va_exclude_end;
+
+	va_exclude_start = VA_EXCLUDE_START;
+	va_exclude_end   = VA_EXCLUDE_END;
+
+	if (unlikely(len >= va_exclude_start))
+		return 1;
+
+	if (unlikely((addr + len) < addr))
+		return 1;
+
+	if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
+		     ((addr + len) >= va_exclude_start &&
+		      (addr + len) < va_exclude_end)))
+		return 1;
+
+	return 0;
+}
+
+/* Does start,end straddle the VA-space hole?  */
+static inline int straddles_64bit_va_hole(unsigned long start, unsigned long end)
+{
+	unsigned long va_exclude_start, va_exclude_end;
+
+	va_exclude_start = VA_EXCLUDE_START;
+	va_exclude_end   = VA_EXCLUDE_END;
+
+	if (likely(start < va_exclude_start && end < va_exclude_start))
+		return 0;
+
+	if (likely(start >= va_exclude_end && end >= va_exclude_end))
+		return 0;
+
+	return 1;
+}
+
+/* These functions differ from the default implementations in
+ * mm/mmap.c in two ways:
+ *
+ * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
+ *    for fixed such mappings we just validate what the user gave us.
+ * 2) For 64-bit tasks we avoid mapping anything within 4GB of
+ *    the spitfire/niagara VA-hole.
+ */
+
+static inline unsigned long COLOUR_ALIGN(unsigned long addr,
+					 unsigned long pgoff)
+{
+	unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
+	unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
+
+	return base + off;
+}
+
+static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
+					      unsigned long pgoff)
+{
+	unsigned long base = addr & ~(SHMLBA-1);
+	unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
+
+	if (base + off <= addr)
+		return base + off;
+	return base - off;
+}
 
 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 {
@@ -64,8 +132,8 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
 	}
 
 	if (test_thread_flag(TIF_32BIT))
-		task_size = 0xf0000000UL;
-	if (len > task_size || len > -PAGE_OFFSET)
+		task_size = STACK_TOP32;
+	if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
 		return -ENOMEM;
 
 	do_color_align = 0;
@@ -84,7 +152,12 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
 			return addr;
 	}
 
-	start_addr = addr = mm->free_area_cache;
+	if (len > mm->cached_hole_size) {
+	        start_addr = addr = mm->free_area_cache;
+	} else {
+	        start_addr = addr = TASK_UNMAPPED_BASE;
+	        mm->cached_hole_size = 0;
+	}
 
 	task_size -= len;
 
@@ -96,30 +169,150 @@ full_search:
 
 	for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
 		/* At this point:  (!vma || addr < vma->vm_end). */
-		if (addr < PAGE_OFFSET && -PAGE_OFFSET - len < addr) {
-			addr = PAGE_OFFSET;
-			vma = find_vma(mm, PAGE_OFFSET);
+		if (addr < VA_EXCLUDE_START &&
+		    (addr + len) >= VA_EXCLUDE_START) {
+			addr = VA_EXCLUDE_END;
+			vma = find_vma(mm, VA_EXCLUDE_END);
 		}
-		if (task_size < addr) {
+		if (unlikely(task_size < addr)) {
 			if (start_addr != TASK_UNMAPPED_BASE) {
 				start_addr = addr = TASK_UNMAPPED_BASE;
+				mm->cached_hole_size = 0;
 				goto full_search;
 			}
 			return -ENOMEM;
 		}
-		if (!vma || addr + len <= vma->vm_start) {
+		if (likely(!vma || addr + len <= vma->vm_start)) {
 			/*
 			 * Remember the place where we stopped the search:
 			 */
 			mm->free_area_cache = addr + len;
 			return addr;
 		}
+		if (addr + mm->cached_hole_size < vma->vm_start)
+		        mm->cached_hole_size = vma->vm_start - addr;
+
 		addr = vma->vm_end;
 		if (do_color_align)
 			addr = COLOUR_ALIGN(addr, pgoff);
 	}
 }
 
+unsigned long
+arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
+			  const unsigned long len, const unsigned long pgoff,
+			  const unsigned long flags)
+{
+	struct vm_area_struct *vma;
+	struct mm_struct *mm = current->mm;
+	unsigned long task_size = STACK_TOP32;
+	unsigned long addr = addr0;
+	int do_color_align;
+
+	/* This should only ever run for 32-bit processes.  */
+	BUG_ON(!test_thread_flag(TIF_32BIT));
+
+	if (flags & MAP_FIXED) {
+		/* We do not accept a shared mapping if it would violate
+		 * cache aliasing constraints.
+		 */
+		if ((flags & MAP_SHARED) &&
+		    ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
+			return -EINVAL;
+		return addr;
+	}
+
+	if (unlikely(len > task_size))
+		return -ENOMEM;
+
+	do_color_align = 0;
+	if (filp || (flags & MAP_SHARED))
+		do_color_align = 1;
+
+	/* requesting a specific address */
+	if (addr) {
+		if (do_color_align)
+			addr = COLOUR_ALIGN(addr, pgoff);
+		else
+			addr = PAGE_ALIGN(addr);
+
+		vma = find_vma(mm, addr);
+		if (task_size - len >= addr &&
+		    (!vma || addr + len <= vma->vm_start))
+			return addr;
+	}
+
+	/* check if free_area_cache is useful for us */
+	if (len <= mm->cached_hole_size) {
+ 	        mm->cached_hole_size = 0;
+ 		mm->free_area_cache = mm->mmap_base;
+ 	}
+
+	/* either no address requested or can't fit in requested address hole */
+	addr = mm->free_area_cache;
+	if (do_color_align) {
+		unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);
+
+		addr = base + len;
+	}
+
+	/* make sure it can fit in the remaining address space */
+	if (likely(addr > len)) {
+		vma = find_vma(mm, addr-len);
+		if (!vma || addr <= vma->vm_start) {
+			/* remember the address as a hint for next time */
+			return (mm->free_area_cache = addr-len);
+		}
+	}
+
+	if (unlikely(mm->mmap_base < len))
+		goto bottomup;
+
+	addr = mm->mmap_base-len;
+	if (do_color_align)
+		addr = COLOUR_ALIGN_DOWN(addr, pgoff);
+
+	do {
+		/*
+		 * Lookup failure means no vma is above this address,
+		 * else if new region fits below vma->vm_start,
+		 * return with success:
+		 */
+		vma = find_vma(mm, addr);
+		if (likely(!vma || addr+len <= vma->vm_start)) {
+			/* remember the address as a hint for next time */
+			return (mm->free_area_cache = addr);
+		}
+
+ 		/* remember the largest hole we saw so far */
+ 		if (addr + mm->cached_hole_size < vma->vm_start)
+ 		        mm->cached_hole_size = vma->vm_start - addr;
+
+		/* try just below the current vma->vm_start */
+		addr = vma->vm_start-len;
+		if (do_color_align)
+			addr = COLOUR_ALIGN_DOWN(addr, pgoff);
+	} while (likely(len < vma->vm_start));
+
+bottomup:
+	/*
+	 * A failed mmap() very likely causes application failure,
+	 * so fall back to the bottom-up function here. This scenario
+	 * can happen with large stack limits and large mmap()
+	 * allocations.
+	 */
+	mm->cached_hole_size = ~0UL;
+  	mm->free_area_cache = TASK_UNMAPPED_BASE;
+	addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
+	/*
+	 * Restore the topdown base:
+	 */
+	mm->free_area_cache = mm->mmap_base;
+	mm->cached_hole_size = ~0UL;
+
+	return addr;
+}
+
 /* Try to align mapping such that we align it as much as possible. */
 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 {
@@ -163,15 +356,57 @@ unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, u
 	return addr;
 }
 
+/* Essentially the same as PowerPC... */
+void arch_pick_mmap_layout(struct mm_struct *mm)
+{
+	unsigned long random_factor = 0UL;
+
+	if (current->flags & PF_RANDOMIZE) {
+		random_factor = get_random_int();
+		if (test_thread_flag(TIF_32BIT))
+			random_factor &= ((1 * 1024 * 1024) - 1);
+		else
+			random_factor = ((random_factor << PAGE_SHIFT) &
+					 0xffffffffUL);
+	}
+
+	/*
+	 * Fall back to the standard layout if the personality
+	 * bit is set, or if the expected stack growth is unlimited:
+	 */
+	if (!test_thread_flag(TIF_32BIT) ||
+	    (current->personality & ADDR_COMPAT_LAYOUT) ||
+	    current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY ||
+	    sysctl_legacy_va_layout) {
+		mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
+		mm->get_unmapped_area = arch_get_unmapped_area;
+		mm->unmap_area = arch_unmap_area;
+	} else {
+		/* We know it's 32-bit */
+		unsigned long task_size = STACK_TOP32;
+		unsigned long gap;
+
+		gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
+		if (gap < 128 * 1024 * 1024)
+			gap = 128 * 1024 * 1024;
+		if (gap > (task_size / 6 * 5))
+			gap = (task_size / 6 * 5);
+
+		mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
+		mm->get_unmapped_area = arch_get_unmapped_area_topdown;
+		mm->unmap_area = arch_unmap_area_topdown;
+	}
+}
+
 asmlinkage unsigned long sparc_brk(unsigned long brk)
 {
 	/* People could try to be nasty and use ta 0x6d in 32bit programs */
-	if (test_thread_flag(TIF_32BIT) &&
-	    brk >= 0xf0000000UL)
+	if (test_thread_flag(TIF_32BIT) && brk >= STACK_TOP32)
 		return current->mm->brk;
 
-	if ((current->mm->brk & PAGE_OFFSET) != (brk & PAGE_OFFSET))
+	if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk)))
 		return current->mm->brk;
+
 	return sys_brk(brk);
 }
                                                                 
@@ -179,7 +414,7 @@ asmlinkage unsigned long sparc_brk(unsigned long brk)
  * sys_pipe() is the normal C calling standard for creating
  * a pipe. It's not the way unix traditionally does this, though.
  */
-asmlinkage int sparc_pipe(struct pt_regs *regs)
+asmlinkage long sparc_pipe(struct pt_regs *regs)
 {
 	int fd[2];
 	int error;
@@ -199,22 +434,24 @@ out:
  * This is really horribly ugly.
  */
 
-asmlinkage int sys_ipc (unsigned call, int first, int second, unsigned long third, void *ptr, long fifth)
+asmlinkage long sys_ipc(unsigned int call, int first, unsigned long second,
+			unsigned long third, void __user *ptr, long fifth)
 {
 	int err;
 
 	/* No need for backward compatibility. We can start fresh... */
-
-	if (call <= SEMCTL)
+	if (call <= SEMCTL) {
 		switch (call) {
 		case SEMOP:
-			err = sys_semtimedop (first, (struct sembuf *)ptr, second, NULL);
+			err = sys_semtimedop(first, ptr,
+					     (unsigned)second, NULL);
 			goto out;
 		case SEMTIMEDOP:
-			err = sys_semtimedop (first, (struct sembuf *)ptr, second, (const struct timespec *) fifth);
+			err = sys_semtimedop(first, ptr, (unsigned)second,
+				(const struct timespec __user *) fifth);
 			goto out;
 		case SEMGET:
-			err = sys_semget (first, second, (int)third);
+			err = sys_semget(first, (int)second, (int)third);
 			goto out;
 		case SEMCTL: {
 			union semun fourth;
@@ -222,79 +459,88 @@ asmlinkage int sys_ipc (unsigned call, int first, int second, unsigned long thir
 			if (!ptr)
 				goto out;
 			err = -EFAULT;
-			if(get_user(fourth.__pad, (void **)ptr))
+			if (get_user(fourth.__pad,
+				     (void __user * __user *) ptr))
 				goto out;
-			err = sys_semctl (first, second | IPC_64, (int)third, fourth);
+			err = sys_semctl(first, (int)second | IPC_64,
+					 (int)third, fourth);
 			goto out;
-			}
+		}
 		default:
 			err = -ENOSYS;
 			goto out;
-		}
-	if (call <= MSGCTL) 
+		};
+	}
+	if (call <= MSGCTL) {
 		switch (call) {
 		case MSGSND:
-			err = sys_msgsnd (first, (struct msgbuf *) ptr, 
-					  second, (int)third);
+			err = sys_msgsnd(first, ptr, (size_t)second,
+					 (int)third);
 			goto out;
 		case MSGRCV:
-			err = sys_msgrcv (first, (struct msgbuf *) ptr, second, fifth, (int)third);
+			err = sys_msgrcv(first, ptr, (size_t)second, fifth,
+					 (int)third);
 			goto out;
 		case MSGGET:
-			err = sys_msgget ((key_t) first, second);
+			err = sys_msgget((key_t)first, (int)second);
 			goto out;
 		case MSGCTL:
-			err = sys_msgctl (first, second | IPC_64, (struct msqid_ds *) ptr);
+			err = sys_msgctl(first, (int)second | IPC_64, ptr);
 			goto out;
 		default:
 			err = -ENOSYS;
 			goto out;
-		}
-	if (call <= SHMCTL) 
+		};
+	}
+	if (call <= SHMCTL) {
 		switch (call) {
 		case SHMAT: {
 			ulong raddr;
-			err = do_shmat (first, (char *) ptr, second, &raddr);
+			err = do_shmat(first, ptr, (int)second, &raddr);
 			if (!err) {
-				if (put_user(raddr, (ulong __user *) third))
+				if (put_user(raddr,
+					     (ulong __user *) third))
 					err = -EFAULT;
 			}
 			goto out;
 		}
 		case SHMDT:
-			err = sys_shmdt ((char *)ptr);
+			err = sys_shmdt(ptr);
 			goto out;
 		case SHMGET:
-			err = sys_shmget (first, second, (int)third);
+			err = sys_shmget(first, (size_t)second, (int)third);
 			goto out;
 		case SHMCTL:
-			err = sys_shmctl (first, second | IPC_64, (struct shmid_ds *) ptr);
+			err = sys_shmctl(first, (int)second | IPC_64, ptr);
 			goto out;
 		default:
 			err = -ENOSYS;
 			goto out;
-		}
-	else
+		};
+	} else {
 		err = -ENOSYS;
+	}
 out:
 	return err;
 }
 
-asmlinkage int sparc64_newuname(struct new_utsname __user *name)
+asmlinkage long sparc64_newuname(struct new_utsname __user *name)
 {
 	int ret = sys_newuname(name);
 	
 	if (current->personality == PER_LINUX32 && !ret) {
-		ret = copy_to_user(name->machine, "sparc\0\0", 8) ? -EFAULT : 0;
+		ret = (copy_to_user(name->machine, "sparc\0\0", 8)
+		       ? -EFAULT : 0);
 	}
 	return ret;
 }
 
-asmlinkage int sparc64_personality(unsigned long personality)
+asmlinkage long sparc64_personality(unsigned long personality)
 {
 	int ret;
 
-	if (current->personality == PER_LINUX32 && personality == PER_LINUX)
+	if (current->personality == PER_LINUX32 &&
+	    personality == PER_LINUX)
 		personality = PER_LINUX32;
 	ret = sys_personality(personality);
 	if (ret == PER_LINUX32)
@@ -303,6 +549,26 @@ asmlinkage int sparc64_personality(unsigned long personality)
 	return ret;
 }
 
+int sparc64_mmap_check(unsigned long addr, unsigned long len,
+		unsigned long flags)
+{
+	if (test_thread_flag(TIF_32BIT)) {
+		if (len >= STACK_TOP32)
+			return -EINVAL;
+
+		if ((flags & MAP_FIXED) && addr > STACK_TOP32 - len)
+			return -EINVAL;
+	} else {
+		if (len >= VA_EXCLUDE_START)
+			return -EINVAL;
+
+		if ((flags & MAP_FIXED) && invalid_64bit_range(addr, len))
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
 /* Linux version of mmap */
 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 	unsigned long prot, unsigned long flags, unsigned long fd,
@@ -318,24 +584,11 @@ asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 	}
 	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 	len = PAGE_ALIGN(len);
-	retval = -EINVAL;
-
-	if (test_thread_flag(TIF_32BIT)) {
-		if (len > 0xf0000000UL ||
-		    ((flags & MAP_FIXED) && addr > 0xf0000000UL - len))
-			goto out_putf;
-	} else {
-		if (len > -PAGE_OFFSET ||
-		    ((flags & MAP_FIXED) &&
-		     addr < PAGE_OFFSET && addr + len > -PAGE_OFFSET))
-			goto out_putf;
-	}
 
 	down_write(&current->mm->mmap_sem);
 	retval = do_mmap(file, addr, len, prot, flags, off);
 	up_write(&current->mm->mmap_sem);
 
-out_putf:
 	if (file)
 		fput(file);
 out:
@@ -346,9 +599,9 @@ asmlinkage long sys64_munmap(unsigned long addr, size_t len)
 {
 	long ret;
 
-	if (len > -PAGE_OFFSET ||
-	    (addr < PAGE_OFFSET && addr + len > -PAGE_OFFSET))
+	if (invalid_64bit_range(addr, len))
 		return -EINVAL;
+
 	down_write(&current->mm->mmap_sem);
 	ret = do_munmap(current->mm, addr, len);
 	up_write(&current->mm->mmap_sem);
@@ -365,18 +618,19 @@ asmlinkage unsigned long sys64_mremap(unsigned long addr,
 {
 	struct vm_area_struct *vma;
 	unsigned long ret = -EINVAL;
+
 	if (test_thread_flag(TIF_32BIT))
 		goto out;
-	if (old_len > -PAGE_OFFSET || new_len > -PAGE_OFFSET)
+	if (unlikely(new_len >= VA_EXCLUDE_START))
 		goto out;
-	if (addr < PAGE_OFFSET && addr + old_len > -PAGE_OFFSET)
+	if (unlikely(invalid_64bit_range(addr, old_len)))
 		goto out;
+
 	down_write(&current->mm->mmap_sem);
 	if (flags & MREMAP_FIXED) {
-		if (new_addr < PAGE_OFFSET &&
-		    new_addr + new_len > -PAGE_OFFSET)
+		if (invalid_64bit_range(new_addr, new_len))
 			goto out_sem;
-	} else if (addr < PAGE_OFFSET && addr + new_len > -PAGE_OFFSET) {
+	} else if (invalid_64bit_range(addr, new_len)) {
 		unsigned long map_flags = 0;
 		struct file *file = NULL;
 
@@ -408,8 +662,7 @@ out:
 }
 
 /* we come to here via sys_nis_syscall so it can setup the regs argument */
-asmlinkage unsigned long
-c_sys_nis_syscall (struct pt_regs *regs)
+asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
 {
 	static int count;
 	
@@ -427,8 +680,7 @@ c_sys_nis_syscall (struct pt_regs *regs)
 
 /* #define DEBUG_SPARC_BREAKPOINT */
 
-asmlinkage void
-sparc_breakpoint (struct pt_regs *regs)
+asmlinkage void sparc_breakpoint(struct pt_regs *regs)
 {
 	siginfo_t info;
 
@@ -442,7 +694,7 @@ sparc_breakpoint (struct pt_regs *regs)
 	info.si_signo = SIGTRAP;
 	info.si_errno = 0;
 	info.si_code = TRAP_BRKPT;
-	info.si_addr = (void *)regs->tpc;
+	info.si_addr = (void __user *)regs->tpc;
 	info.si_trapno = 0;
 	force_sig_info(SIGTRAP, &info, current);
 #ifdef DEBUG_SPARC_BREAKPOINT
@@ -452,28 +704,30 @@ sparc_breakpoint (struct pt_regs *regs)
 
 extern void check_pending(int signum);
 
-asmlinkage int sys_getdomainname(char __user *name, int len)
+asmlinkage long sys_getdomainname(char __user *name, int len)
 {
-        int nlen;
-	int err = -EFAULT;
+        int nlen, err;
+
+	if (len < 0)
+		return -EINVAL;
 
  	down_read(&uts_sem);
  	
-	nlen = strlen(system_utsname.domainname) + 1;
-
-        if (nlen < len)
-                len = nlen;
-	if (len > __NEW_UTS_LEN)
-		goto done;
-	if (copy_to_user(name, system_utsname.domainname, len))
-		goto done;
-	err = 0;
-done:
+	nlen = strlen(utsname()->domainname) + 1;
+	err = -EINVAL;
+	if (nlen > len)
+		goto out;
+
+	err = -EFAULT;
+	if (!copy_to_user(name, utsname()->domainname, nlen))
+		err = 0;
+
+out:
 	up_read(&uts_sem);
 	return err;
 }
 
-asmlinkage int solaris_syscall(struct pt_regs *regs)
+asmlinkage long solaris_syscall(struct pt_regs *regs)
 {
 	static int count;
 
@@ -493,7 +747,7 @@ asmlinkage int solaris_syscall(struct pt_regs *regs)
 }
 
 #ifndef CONFIG_SUNOS_EMUL
-asmlinkage int sunos_syscall(struct pt_regs *regs)
+asmlinkage long sunos_syscall(struct pt_regs *regs)
 {
 	static int count;
 
@@ -511,11 +765,11 @@ asmlinkage int sunos_syscall(struct pt_regs *regs)
 }
 #endif
 
-asmlinkage int sys_utrap_install(utrap_entry_t type,
-				 utrap_handler_t new_p,
-				 utrap_handler_t new_d,
-				 utrap_handler_t __user *old_p,
-				 utrap_handler_t __user *old_d)
+asmlinkage long sys_utrap_install(utrap_entry_t type,
+				  utrap_handler_t new_p,
+				  utrap_handler_t new_d,
+				  utrap_handler_t __user *old_p,
+				  utrap_handler_t __user *old_d)
 {
 	if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
 		return -EINVAL;
@@ -537,12 +791,10 @@ asmlinkage int sys_utrap_install(utrap_entry_t type,
 	}
 	if (!current_thread_info()->utraps) {
 		current_thread_info()->utraps =
-			kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
+			kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
 		if (!current_thread_info()->utraps)
 			return -ENOMEM;
 		current_thread_info()->utraps[0] = 1;
-		memset(current_thread_info()->utraps+1, 0,
-		       UT_TRAP_INSTRUCTION_31*sizeof(long));
 	} else {
 		if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
 		    current_thread_info()->utraps[0] > 1) {
@@ -582,12 +834,11 @@ long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
 	return 0;
 }
 
-asmlinkage long
-sys_rt_sigaction(int sig,
-		const struct sigaction __user *act,
-		struct sigaction __user *oact,
-		void __user *restorer,
-		size_t sigsetsize)
+asmlinkage long sys_rt_sigaction(int sig,
+				 const struct sigaction __user *act,
+				 struct sigaction __user *oact,
+				 void __user *restorer,
+				 size_t sigsetsize)
 {
 	struct k_sigaction new_ka, old_ka;
 	int ret;
@@ -615,8 +866,7 @@ sys_rt_sigaction(int sig,
 /* Invoked by rtrap code to update performance counters in
  * user space.
  */
-asmlinkage void
-update_perfctrs(void)
+asmlinkage void update_perfctrs(void)
 {
 	unsigned long pic, tmp;
 
@@ -628,16 +878,15 @@ update_perfctrs(void)
 	reset_pic();
 }
 
-asmlinkage int
-sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
+asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
 {
 	int err = 0;
 
 	switch(opcode) {
 	case PERFCTR_ON:
 		current_thread_info()->pcr_reg = arg2;
-		current_thread_info()->user_cntd0 = (u64 *) arg0;
-		current_thread_info()->user_cntd1 = (u64 *) arg1;
+		current_thread_info()->user_cntd0 = (u64 __user *) arg0;
+		current_thread_info()->user_cntd1 = (u64 __user *) arg1;
 		current_thread_info()->kernel_cntd0 =
 			current_thread_info()->kernel_cntd1 = 0;
 		write_pcr(arg2);
@@ -684,7 +933,8 @@ sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long ar
 		break;
 
 	case PERFCTR_SETPCR: {
-		u64 *user_pcr = (u64 *)arg0;
+		u64 __user *user_pcr = (u64 __user *)arg0;
+
 		if (!test_thread_flag(TIF_PERFCTR)) {
 			err = -EINVAL;
 			break;
@@ -698,7 +948,8 @@ sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long ar
 	}
 
 	case PERFCTR_GETPCR: {
-		u64 *user_pcr = (u64 *)arg0;
+		u64 __user *user_pcr = (u64 __user *)arg0;
+
 		if (!test_thread_flag(TIF_PERFCTR)) {
 			err = -EINVAL;
 			break;
@@ -713,3 +964,23 @@ sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long ar
 	};
 	return err;
 }
+
+/*
+ * Do a system call from kernel instead of calling sys_execve so we
+ * end up with proper pt_regs.
+ */
+int kernel_execve(const char *filename, char *const argv[], char *const envp[])
+{
+	long __res;
+	register long __g1 __asm__ ("g1") = __NR_execve;
+	register long __o0 __asm__ ("o0") = (long)(filename);
+	register long __o1 __asm__ ("o1") = (long)(argv);
+	register long __o2 __asm__ ("o2") = (long)(envp);
+	asm volatile ("t 0x6d\n\t"
+		      "sub %%g0, %%o0, %0\n\t"
+		      "movcc %%xcc, %%o0, %0\n\t"
+		      : "=r" (__res), "=&r" (__o0)
+		      : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
+		      : "cc");
+	return __res;
+}