sys/compat/common/compat_sigaltstack.h

   1 /*      $NetBSD: compat_sigaltstack.h,v 1.1 2007/06/03 14:59:46 dsl Exp $        */
   2
   3 /* Wrapper for calling sigaltstack1() from compat (or other) code */
   4
   5 /* Maybe these definitions could be global. */
   6 #ifdef SCARG_P32
   7 /* compat32 */
   8 #define SCARG_COMPAT_PTR(uap,p) SCARG_P32(uap, p)
   9 #define COMPAT_GET_PTR(p)       NETBSD32PTR64(p)
  10 #define COMPAT_SET_PTR(p, v)    NETBSD32PTR32(p, v)
  11 #else
  12 /* not a size change */
  13 #define SCARG_COMPAT_PTR(uap,p) SCARG(uap, p)
  14 #define COMPAT_GET_PTR(p)       (p)
  15 #define COMPAT_SET_PTR(p, v)    ((p) = (v))
  16 #endif
  17
  18 #define compat_sigaltstack(uap, compat_ss, ss_onstack, ss_disable) do { \
  19         struct compat_ss css; \
  20         struct sigaltstack nss, oss; \
  21         int error; \
  22 \
  23         if (SCARG_COMPAT_PTR(uap, nss)) { \
  24                 error = copyin(SCARG_COMPAT_PTR(uap, nss), &css, sizeof css); \
  25                 if (error) \
  26                         return error; \
  27                 nss.ss_sp = COMPAT_GET_PTR(css.ss_sp); \
  28                 nss.ss_size = css.ss_size; \
  29                 if (ss_onstack == SS_ONSTACK && ss_disable == SS_DISABLE) \
  30                         nss.ss_flags = css.ss_flags; \
  31                 else \
  32                         nss.ss_flags = \
  33                             (css.ss_flags & ss_onstack ? SS_ONSTACK : 0) \
  34                             | (css.ss_flags & ss_disable ? SS_DISABLE : 0); \
  35         } \
  36 \
  37         error = sigaltstack1(l, SCARG_COMPAT_PTR(uap, nss) ? &nss : 0, \
  38                                 SCARG_COMPAT_PTR(uap, oss) ? &oss : 0); \
  39         if (error) \
  40                 return (error); \
  41 \
  42         if (SCARG_COMPAT_PTR(uap, oss)) { \
  43                 COMPAT_SET_PTR(css.ss_sp, oss.ss_sp); \
  44                 css.ss_size = oss.ss_size; \
  45                 if (ss_onstack == SS_ONSTACK && ss_disable == SS_DISABLE) \
  46                         css.ss_flags = oss.ss_flags; \
  47                 else \
  48                         css.ss_flags = \
  49                             (oss.ss_flags & SS_ONSTACK ? ss_onstack : 0) \
  50                             | (oss.ss_flags & SS_DISABLE ? ss_disable : 0); \
  51                 error = copyout(&css, SCARG_COMPAT_PTR(uap, oss), sizeof(css));\
  52                 if (error) \
  53                         return (error); \
  54         } \
  55         return (0); \
  56 } while (0)