[MIPS] Fix sigset_t endianess swapping issues in 32-bit compat code.

[sfrench/cifs-2.6.git] / include / asm-mips / compat-signal.h

diff --git a/include/asm-mips/compat-signal.h b/include/asm-mips/compat-signal.h
new file mode 100644 (file)
index 0000000..6720770
--- /dev/null
+++ b/include/asm-mips/compat-signal.h
@@ -0,0 +1,55 @@
+#ifndef __ASM_COMPAT_SIGNAL_H
+#define __ASM_COMPAT_SIGNAL_H
+
+#include <linux/bug.h>
+#include <linux/compat.h>
+#include <linux/compiler.h>
+
+static inline int __copy_conv_sigset_to_user(compat_sigset_t __user *d,
+       const sigset_t *s)
+{
+       int err;
+
+       BUG_ON(sizeof(*d) != sizeof(*s));
+       BUG_ON(_NSIG_WORDS != 2);
+
+       err  = __put_user(s->sig[0],       &d->sig[0]);
+       err |= __put_user(s->sig[0] >> 32, &d->sig[1]);
+       err |= __put_user(s->sig[1],       &d->sig[2]);
+       err |= __put_user(s->sig[1] >> 32, &d->sig[3]);
+
+       return err;
+}
+
+static inline int __copy_conv_sigset_from_user(sigset_t *d,
+       const compat_sigset_t __user *s)
+{
+       int err;
+       union sigset_u {
+               sigset_t        s;
+               compat_sigset_t c;
+       } *u = (union sigset_u *) d;
+
+       BUG_ON(sizeof(*d) != sizeof(*s));
+       BUG_ON(_NSIG_WORDS != 2);
+
+       if (unlikely(!access_ok(VERIFY_READ, d, sizeof(*d))))
+               return -EFAULT;
+
+#ifdef CONFIG_CPU_BIG_ENDIAN
+       err  = __get_user(u->c.sig[1], &s->sig[0]);
+       err |= __get_user(u->c.sig[0], &s->sig[1]);
+       err |= __get_user(u->c.sig[3], &s->sig[2]);
+       err |= __get_user(u->c.sig[2], &s->sig[3]);
+#endif
+#ifdef CONFIG_CPU_LITTLE_ENDIAN
+       err  = __get_user(u->c.sig[0], &s->sig[0]);
+       err |= __get_user(u->c.sig[1], &s->sig[1]);
+       err |= __get_user(u->c.sig[2], &s->sig[2]);
+       err |= __get_user(u->c.sig[3], &s->sig[3]);
+#endif
+
+       return err;
+}
+
+#endif /* __ASM_COMPAT_SIGNAL_H */