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authorAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
committerAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
commitb4b6116a13633898cf868f2f103c96a90c4c20f8 (patch)
tree93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /arch/sparc/kernel/sys_sparc_64.c
parentedd4be777c953e5faafc80d091d3084b4343f5d3 (diff)
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fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/sparc/kernel/sys_sparc_64.c')
-rw-r--r--arch/sparc/kernel/sys_sparc_64.c782
1 files changed, 782 insertions, 0 deletions
diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
new file mode 100644
index 00000000000..232df994953
--- /dev/null
+++ b/arch/sparc/kernel/sys_sparc_64.c
@@ -0,0 +1,782 @@
+/* linux/arch/sparc64/kernel/sys_sparc.c
+ *
+ * This file contains various random system calls that
+ * have a non-standard calling sequence on the Linux/sparc
+ * platform.
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/mm.h>
+#include <linux/sem.h>
+#include <linux/msg.h>
+#include <linux/shm.h>
+#include <linux/stat.h>
+#include <linux/mman.h>
+#include <linux/utsname.h>
+#include <linux/smp.h>
+#include <linux/slab.h>
+#include <linux/syscalls.h>
+#include <linux/ipc.h>
+#include <linux/personality.h>
+#include <linux/random.h>
+#include <linux/export.h>
+
+#include <asm/uaccess.h>
+#include <asm/utrap.h>
+#include <asm/unistd.h>
+
+#include "entry.h"
+#include "systbls.h"
+
+/* #define DEBUG_UNIMP_SYSCALL */
+
+asmlinkage unsigned long sys_getpagesize(void)
+{
+ return PAGE_SIZE;
+}
+
+#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)
+{
+ struct mm_struct *mm = current->mm;
+ struct vm_area_struct * vma;
+ unsigned long task_size = TASK_SIZE;
+ unsigned long start_addr;
+ int do_color_align;
+
+ 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 (test_thread_flag(TIF_32BIT))
+ task_size = STACK_TOP32;
+ if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
+ return -ENOMEM;
+
+ do_color_align = 0;
+ if (filp || (flags & MAP_SHARED))
+ do_color_align = 1;
+
+ 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;
+ }
+
+ 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;
+
+full_search:
+ if (do_color_align)
+ addr = COLOUR_ALIGN(addr, pgoff);
+ else
+ addr = PAGE_ALIGN(addr);
+
+ for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
+ /* At this point: (!vma || addr < vma->vm_end). */
+ if (addr < VA_EXCLUDE_START &&
+ (addr + len) >= VA_EXCLUDE_START) {
+ addr = VA_EXCLUDE_END;
+ vma = find_vma(mm, VA_EXCLUDE_END);
+ }
+ 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 (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)
+{
+ unsigned long align_goal, addr = -ENOMEM;
+ unsigned long (*get_area)(struct file *, unsigned long,
+ unsigned long, unsigned long, unsigned long);
+
+ get_area = current->mm->get_unmapped_area;
+
+ if (flags & MAP_FIXED) {
+ /* Ok, don't mess with it. */
+ return get_area(NULL, orig_addr, len, pgoff, flags);
+ }
+ flags &= ~MAP_SHARED;
+
+ align_goal = PAGE_SIZE;
+ if (len >= (4UL * 1024 * 1024))
+ align_goal = (4UL * 1024 * 1024);
+ else if (len >= (512UL * 1024))
+ align_goal = (512UL * 1024);
+ else if (len >= (64UL * 1024))
+ align_goal = (64UL * 1024);
+
+ do {
+ addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
+ if (!(addr & ~PAGE_MASK)) {
+ addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
+ break;
+ }
+
+ if (align_goal == (4UL * 1024 * 1024))
+ align_goal = (512UL * 1024);
+ else if (align_goal == (512UL * 1024))
+ align_goal = (64UL * 1024);
+ else
+ align_goal = PAGE_SIZE;
+ } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
+
+ /* Mapping is smaller than 64K or larger areas could not
+ * be obtained.
+ */
+ if (addr & ~PAGE_MASK)
+ addr = get_area(NULL, orig_addr, len, pgoff, flags);
+
+ return addr;
+}
+EXPORT_SYMBOL(get_fb_unmapped_area);
+
+/* Essentially the same as PowerPC. */
+static unsigned long mmap_rnd(void)
+{
+ unsigned long rnd = 0UL;
+
+ if (current->flags & PF_RANDOMIZE) {
+ unsigned long val = get_random_int();
+ if (test_thread_flag(TIF_32BIT))
+ rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
+ else
+ rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
+ }
+ return rnd << PAGE_SHIFT;
+}
+
+void arch_pick_mmap_layout(struct mm_struct *mm)
+{
+ unsigned long random_factor = mmap_rnd();
+ unsigned long gap;
+
+ /*
+ * Fall back to the standard layout if the personality
+ * bit is set, or if the expected stack growth is unlimited:
+ */
+ gap = rlimit(RLIMIT_STACK);
+ if (!test_thread_flag(TIF_32BIT) ||
+ (current->personality & ADDR_COMPAT_LAYOUT) ||
+ gap == 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;
+
+ 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;
+ }
+}
+
+/*
+ * sys_pipe() is the normal C calling standard for creating
+ * a pipe. It's not the way unix traditionally does this, though.
+ */
+SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
+{
+ int fd[2];
+ int error;
+
+ error = do_pipe_flags(fd, 0);
+ if (error)
+ goto out;
+ regs->u_regs[UREG_I1] = fd[1];
+ error = fd[0];
+out:
+ return error;
+}
+
+/*
+ * sys_ipc() is the de-multiplexer for the SysV IPC calls..
+ *
+ * This is really horribly ugly.
+ */
+
+SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
+ unsigned long, third, void __user *, ptr, long, fifth)
+{
+ long err;
+
+ /* No need for backward compatibility. We can start fresh... */
+ if (call <= SEMCTL) {
+ switch (call) {
+ case SEMOP:
+ err = sys_semtimedop(first, ptr,
+ (unsigned)second, NULL);
+ goto out;
+ case SEMTIMEDOP:
+ err = sys_semtimedop(first, ptr, (unsigned)second,
+ (const struct timespec __user *)
+ (unsigned long) fifth);
+ goto out;
+ case SEMGET:
+ err = sys_semget(first, (int)second, (int)third);
+ goto out;
+ case SEMCTL: {
+ err = sys_semctl(first, second,
+ (int)third | IPC_64,
+ (union semun) ptr);
+ goto out;
+ }
+ default:
+ err = -ENOSYS;
+ goto out;
+ }
+ }
+ if (call <= MSGCTL) {
+ switch (call) {
+ case MSGSND:
+ err = sys_msgsnd(first, ptr, (size_t)second,
+ (int)third);
+ goto out;
+ case MSGRCV:
+ err = sys_msgrcv(first, ptr, (size_t)second, fifth,
+ (int)third);
+ goto out;
+ case MSGGET:
+ err = sys_msgget((key_t)first, (int)second);
+ goto out;
+ case MSGCTL:
+ err = sys_msgctl(first, (int)second | IPC_64, ptr);
+ goto out;
+ default:
+ err = -ENOSYS;
+ goto out;
+ }
+ }
+ if (call <= SHMCTL) {
+ switch (call) {
+ case SHMAT: {
+ ulong raddr;
+ err = do_shmat(first, ptr, (int)second, &raddr);
+ if (!err) {
+ if (put_user(raddr,
+ (ulong __user *) third))
+ err = -EFAULT;
+ }
+ goto out;
+ }
+ case SHMDT:
+ err = sys_shmdt(ptr);
+ goto out;
+ case SHMGET:
+ err = sys_shmget(first, (size_t)second, (int)third);
+ goto out;
+ case SHMCTL:
+ err = sys_shmctl(first, (int)second | IPC_64, ptr);
+ goto out;
+ default:
+ err = -ENOSYS;
+ goto out;
+ }
+ } else {
+ err = -ENOSYS;
+ }
+out:
+ return err;
+}
+
+SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
+{
+ int ret;
+
+ if (current->personality == PER_LINUX32 &&
+ personality == PER_LINUX)
+ personality = PER_LINUX32;
+ ret = sys_personality(personality);
+ if (ret == PER_LINUX32)
+ ret = PER_LINUX;
+
+ return ret;
+}
+
+int sparc_mmap_check(unsigned long addr, unsigned long len)
+{
+ if (test_thread_flag(TIF_32BIT)) {
+ if (len >= STACK_TOP32)
+ return -EINVAL;
+
+ if (addr > STACK_TOP32 - len)
+ return -EINVAL;
+ } else {
+ if (len >= VA_EXCLUDE_START)
+ return -EINVAL;
+
+ if (invalid_64bit_range(addr, len))
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/* Linux version of mmap */
+SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
+ unsigned long, prot, unsigned long, flags, unsigned long, fd,
+ unsigned long, off)
+{
+ unsigned long retval = -EINVAL;
+
+ if ((off + PAGE_ALIGN(len)) < off)
+ goto out;
+ if (off & ~PAGE_MASK)
+ goto out;
+ retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
+out:
+ return retval;
+}
+
+SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
+{
+ long ret;
+
+ 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);
+ return ret;
+}
+
+extern unsigned long do_mremap(unsigned long addr,
+ unsigned long old_len, unsigned long new_len,
+ unsigned long flags, unsigned long new_addr);
+
+SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
+ unsigned long, new_len, unsigned long, flags,
+ unsigned long, new_addr)
+{
+ unsigned long ret = -EINVAL;
+
+ if (test_thread_flag(TIF_32BIT))
+ goto out;
+
+ down_write(&current->mm->mmap_sem);
+ ret = do_mremap(addr, old_len, new_len, flags, new_addr);
+ up_write(&current->mm->mmap_sem);
+out:
+ return ret;
+}
+
+/* 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)
+{
+ static int count;
+
+ /* Don't make the system unusable, if someone goes stuck */
+ if (count++ > 5)
+ return -ENOSYS;
+
+ printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
+#ifdef DEBUG_UNIMP_SYSCALL
+ show_regs (regs);
+#endif
+
+ return -ENOSYS;
+}
+
+/* #define DEBUG_SPARC_BREAKPOINT */
+
+asmlinkage void sparc_breakpoint(struct pt_regs *regs)
+{
+ siginfo_t info;
+
+ if (test_thread_flag(TIF_32BIT)) {
+ regs->tpc &= 0xffffffff;
+ regs->tnpc &= 0xffffffff;
+ }
+#ifdef DEBUG_SPARC_BREAKPOINT
+ printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
+#endif
+ info.si_signo = SIGTRAP;
+ info.si_errno = 0;
+ info.si_code = TRAP_BRKPT;
+ info.si_addr = (void __user *)regs->tpc;
+ info.si_trapno = 0;
+ force_sig_info(SIGTRAP, &info, current);
+#ifdef DEBUG_SPARC_BREAKPOINT
+ printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
+#endif
+}
+
+extern void check_pending(int signum);
+
+SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
+{
+ int nlen, err;
+
+ if (len < 0)
+ return -EINVAL;
+
+ down_read(&uts_sem);
+
+ 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;
+}
+
+SYSCALL_DEFINE5(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;
+ if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
+ if (old_p) {
+ if (!current_thread_info()->utraps) {
+ if (put_user(NULL, old_p))
+ return -EFAULT;
+ } else {
+ if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
+ return -EFAULT;
+ }
+ }
+ if (old_d) {
+ if (put_user(NULL, old_d))
+ return -EFAULT;
+ }
+ return 0;
+ }
+ if (!current_thread_info()->utraps) {
+ current_thread_info()->utraps =
+ kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
+ if (!current_thread_info()->utraps)
+ return -ENOMEM;
+ current_thread_info()->utraps[0] = 1;
+ } else {
+ if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
+ current_thread_info()->utraps[0] > 1) {
+ unsigned long *p = current_thread_info()->utraps;
+
+ current_thread_info()->utraps =
+ kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
+ GFP_KERNEL);
+ if (!current_thread_info()->utraps) {
+ current_thread_info()->utraps = p;
+ return -ENOMEM;
+ }
+ p[0]--;
+ current_thread_info()->utraps[0] = 1;
+ memcpy(current_thread_info()->utraps+1, p+1,
+ UT_TRAP_INSTRUCTION_31*sizeof(long));
+ }
+ }
+ if (old_p) {
+ if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
+ return -EFAULT;
+ }
+ if (old_d) {
+ if (put_user(NULL, old_d))
+ return -EFAULT;
+ }
+ current_thread_info()->utraps[type] = (long)new_p;
+
+ return 0;
+}
+
+asmlinkage long sparc_memory_ordering(unsigned long model,
+ struct pt_regs *regs)
+{
+ if (model >= 3)
+ return -EINVAL;
+ regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
+ return 0;
+}
+
+SYSCALL_DEFINE5(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;
+
+ /* XXX: Don't preclude handling different sized sigset_t's. */
+ if (sigsetsize != sizeof(sigset_t))
+ return -EINVAL;
+
+ if (act) {
+ new_ka.ka_restorer = restorer;
+ if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
+ return -EFAULT;
+ }
+
+ ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
+
+ if (!ret && oact) {
+ if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
+ return -EFAULT;
+ }
+
+ return ret;
+}
+
+/*
+ * 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,
+ const char *const argv[],
+ const 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;
+}