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 | |