1 | /* Copyright (C) 2001-2022 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <libintl.h> |
19 | #include <stdarg.h> |
20 | #include <stdio.h> |
21 | #include <stdlib.h> |
22 | #include <ucontext.h> |
23 | #include <sys/rse.h> |
24 | #include <link.h> |
25 | #include <dl-fptr.h> |
26 | |
27 | |
28 | #define PUSH(val) \ |
29 | do { \ |
30 | if (ia64_rse_is_rnat_slot (rbs)) \ |
31 | *rbs++ = 0; \ |
32 | *rbs++ = (val); \ |
33 | } while (0) |
34 | |
35 | |
36 | /* This implementation can handle an ARGC value of at most 8 and |
37 | values can be passed only in integer registers (r32-r39). */ |
38 | |
39 | void |
40 | __makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...) |
41 | { |
42 | mcontext_t *sc = &ucp->uc_mcontext; |
43 | extern void __start_context (ucontext_t *link, long gp, ...); |
44 | unsigned long stack_start, stack_end; |
45 | va_list ap; |
46 | unsigned long *rbs; |
47 | int i; |
48 | |
49 | stack_start = (long) sc->sc_stack.ss_sp; |
50 | stack_end = (long) sc->sc_stack.ss_sp + sc->sc_stack.ss_size; |
51 | |
52 | stack_start = (stack_start + 7) & -8; |
53 | stack_end = stack_end & -16; |
54 | |
55 | if (argc > 8) |
56 | { |
57 | fprintf (stderr, _("\ |
58 | makecontext: does not know how to handle more than 8 arguments\n" )); |
59 | exit (-1); |
60 | } |
61 | |
62 | /* set the entry point and global pointer: */ |
63 | sc->sc_br[0] = ELF_PTR_TO_FDESC (&__start_context)->ip; |
64 | sc->sc_br[1] = ELF_PTR_TO_FDESC (func)->ip; |
65 | sc->sc_gr[1] = ELF_PTR_TO_FDESC (func)->gp; |
66 | |
67 | /* set up the call frame: */ |
68 | sc->sc_ar_pfs = ((sc->sc_ar_pfs & ~0x3fffffffffUL) |
69 | | (argc + 2) | ((argc + 2) << 7)); |
70 | rbs = (unsigned long *) stack_start; |
71 | PUSH((long) ucp->uc_link); |
72 | PUSH(ELF_PTR_TO_FDESC (&__start_context)->gp); |
73 | va_start (ap, argc); |
74 | for (i = 0; i < argc; ++i) |
75 | PUSH(va_arg (ap, long)); |
76 | va_end (ap); |
77 | |
78 | /* set the memory and register stack pointers: */ |
79 | sc->sc_ar_bsp = (long) rbs; |
80 | sc->sc_gr[12] = stack_end - 16; |
81 | |
82 | /* clear the NaT bits for r1 and r12: */ |
83 | sc->sc_nat &= ~((1 << 1) | (1 << 12)); |
84 | sc->sc_ar_rnat = 0; |
85 | } |
86 | |
87 | weak_alias (__makecontext, makecontext) |
88 | |