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compat_sigaltstack.h revision 1.4 
      1  1.4  thorpej /*      $NetBSD: compat_sigaltstack.h,v 1.4 2021/11/01 05:07:16 thorpej 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  1.4  thorpej 	stack_t 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  1.3      dsl 	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