| 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 | |