/* $NetBSD: compat_sigaltstack.h,v 1.4 2021/11/01 05:07:16 thorpej Exp $ */
/* Wrapper for calling sigaltstack1() from compat (or other) code */
/* Maybe these definitions could be global. */
#ifdef SCARG_P32
/* compat32 */
#define SCARG_COMPAT_PTR(uap,p) SCARG_P32(uap, p)
#define COMPAT_GET_PTR(p) NETBSD32PTR64(p)
#define COMPAT_SET_PTR(p, v) NETBSD32PTR32(p, v)
#else
/* not a size change */
#define SCARG_COMPAT_PTR(uap,p) SCARG(uap, p)
#define COMPAT_GET_PTR(p) (p)
#define COMPAT_SET_PTR(p, v) ((p) = (v))
#endif
#define compat_sigaltstack(uap, compat_ss, ss_onstack, ss_disable) do { \
struct compat_ss css; \
stack_t nss, oss; \
int error; \
\
if (SCARG_COMPAT_PTR(uap, nss)) { \
error = copyin(SCARG_COMPAT_PTR(uap, nss), &css, sizeof css); \
if (error) \
return error; \
nss.ss_sp = COMPAT_GET_PTR(css.ss_sp); \
nss.ss_size = css.ss_size; \
if (ss_onstack == SS_ONSTACK && ss_disable == SS_DISABLE) \
nss.ss_flags = css.ss_flags; \
else \
nss.ss_flags = \
(css.ss_flags & ss_onstack ? SS_ONSTACK : 0) \
| (css.ss_flags & ss_disable ? SS_DISABLE : 0); \
} \
\
error = sigaltstack1(curlwp, SCARG_COMPAT_PTR(uap, nss) ? &nss : 0, \
SCARG_COMPAT_PTR(uap, oss) ? &oss : 0); \
if (error) \
return (error); \
\
if (SCARG_COMPAT_PTR(uap, oss)) { \
COMPAT_SET_PTR(css.ss_sp, oss.ss_sp); \
css.ss_size = oss.ss_size; \
if (ss_onstack == SS_ONSTACK && ss_disable == SS_DISABLE) \
css.ss_flags = oss.ss_flags; \
else \
css.ss_flags = \
(oss.ss_flags & SS_ONSTACK ? ss_onstack : 0) \
| (oss.ss_flags & SS_DISABLE ? ss_disable : 0); \
error = copyout(&css, SCARG_COMPAT_PTR(uap, oss), sizeof(css));\
if (error) \
return (error); \
} \
return (0); \
} while (0)
