compat_sigaltstack.h

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    1 /*      $NetBSD: compat_sigaltstack.h,v 1.2 2007/06/16 20:04:27 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)

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FreeBSD/Linux Kernel Cross Reference sys/compat/common/compat_sigaltstack.h

FreeBSD/Linux Kernel Cross Reference
sys/compat/common/compat_sigaltstack.h