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