1/* $NetBSD: compat_sigaltstack.h,v 1.3 2011/06/05 09:37:10 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(curlwp, 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)
57