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compat_sigaltstack.h revision 1.2.60.1 
      1  1.2.60.1  rmind /*      $NetBSD: compat_sigaltstack.h,v 1.2.60.1 2011/06/12 00:24:12 rmind Exp $        */
      2       1.1    dsl 
      3       1.1    dsl /* Wrapper for calling sigaltstack1() from compat (or other) code */
      4       1.1    dsl 
      5       1.1    dsl /* Maybe these definitions could be global. */
      6       1.1    dsl #ifdef SCARG_P32
      7       1.1    dsl /* compat32 */
      8       1.1    dsl #define	SCARG_COMPAT_PTR(uap,p)	SCARG_P32(uap, p)
      9       1.1    dsl #define	COMPAT_GET_PTR(p)	NETBSD32PTR64(p)
     10       1.1    dsl #define	COMPAT_SET_PTR(p, v)	NETBSD32PTR32(p, v)
     11       1.1    dsl #else
     12       1.1    dsl /* not a size change */
     13       1.1    dsl #define	SCARG_COMPAT_PTR(uap,p)	SCARG(uap, p)
     14       1.1    dsl #define	COMPAT_GET_PTR(p)	(p)
     15       1.1    dsl #define	COMPAT_SET_PTR(p, v)	((p) = (v))
     16       1.1    dsl #endif
     17       1.1    dsl 
     18       1.2    dsl #define compat_sigaltstack(uap, compat_ss, ss_onstack, ss_disable) do { \
     19       1.1    dsl 	struct compat_ss css; \
     20       1.1    dsl 	struct sigaltstack nss, oss; \
     21       1.1    dsl 	int error; \
     22       1.1    dsl \
     23       1.1    dsl 	if (SCARG_COMPAT_PTR(uap, nss)) { \
     24       1.1    dsl 		error = copyin(SCARG_COMPAT_PTR(uap, nss), &css, sizeof css); \
     25       1.1    dsl 		if (error) \
     26       1.1    dsl 			return error; \
     27       1.2    dsl 		nss.ss_sp = COMPAT_GET_PTR(css.ss_sp); \
     28       1.2    dsl 		nss.ss_size = css.ss_size; \
     29       1.2    dsl 		if (ss_onstack == SS_ONSTACK && ss_disable == SS_DISABLE) \
     30       1.2    dsl 			nss.ss_flags = css.ss_flags; \
     31       1.2    dsl 		else \
     32       1.2    dsl 			nss.ss_flags = \
     33       1.2    dsl 			    (css.ss_flags & ss_onstack ? SS_ONSTACK : 0) \
     34       1.2    dsl 			    | (css.ss_flags & ss_disable ? SS_DISABLE : 0); \
     35       1.1    dsl 	} \
     36       1.1    dsl \
     37  1.2.60.1  rmind 	error = sigaltstack1(curlwp, SCARG_COMPAT_PTR(uap, nss) ? &nss : 0, \
     38       1.1    dsl 				SCARG_COMPAT_PTR(uap, oss) ? &oss : 0); \
     39       1.1    dsl 	if (error) \
     40       1.1    dsl 		return (error); \
     41       1.1    dsl \
     42       1.1    dsl 	if (SCARG_COMPAT_PTR(uap, oss)) { \
     43       1.1    dsl 		COMPAT_SET_PTR(css.ss_sp, oss.ss_sp); \
     44       1.1    dsl 		css.ss_size = oss.ss_size; \
     45       1.2    dsl 		if (ss_onstack == SS_ONSTACK && ss_disable == SS_DISABLE) \
     46       1.2    dsl 			css.ss_flags = oss.ss_flags; \
     47       1.2    dsl 		else \
     48       1.2    dsl 			css.ss_flags = \
     49       1.2    dsl 			    (oss.ss_flags & SS_ONSTACK ? ss_onstack : 0) \
     50       1.2    dsl 			    | (oss.ss_flags & SS_DISABLE ? ss_disable : 0); \
     51       1.2    dsl 		error = copyout(&css, SCARG_COMPAT_PTR(uap, oss), sizeof(css));\
     52       1.1    dsl 		if (error) \
     53       1.1    dsl 			return (error); \
     54       1.1    dsl 	} \
     55       1.1    dsl 	return (0); \
     56       1.1    dsl } while (0)
     57