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5f72b005 | 1 | /* Create new context. C-SKY version. |
6d7e8eda | 2 | Copyright (C) 2018-2023 Free Software Foundation, Inc. |
5f72b005 MH |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library. If not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
5f72b005 MH |
18 | |
19 | #include <stdarg.h> | |
20 | #include <ucontext.h> | |
21 | ||
22 | /* Number of arguments that go in registers. */ | |
23 | #define NREG_ARGS 4 | |
24 | ||
25 | /* Take a context previously prepared via getcontext() and set to | |
26 | call func() with the given int only args. */ | |
27 | void | |
28 | __makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...) | |
29 | { | |
30 | extern void __startcontext (void); | |
31 | unsigned long *funcstack; | |
32 | va_list vl; | |
33 | unsigned long *regptr; | |
34 | unsigned int reg; | |
35 | int misaligned; | |
36 | ||
37 | /* Start at the top of stack. */ | |
38 | funcstack = (unsigned long *) (ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size); | |
39 | ||
40 | /* Ensure the stack stays eight byte aligned. */ | |
41 | misaligned = ((unsigned long) funcstack & 4) != 0; | |
42 | ||
43 | if ((argc > NREG_ARGS) && (argc & 1) != 0) | |
44 | misaligned = !misaligned; | |
45 | ||
46 | if (misaligned) | |
47 | funcstack -= 1; | |
48 | ||
49 | va_start (vl, argc); | |
50 | ||
51 | /* Reserve space for the on-stack arguments. */ | |
52 | if (argc > NREG_ARGS) | |
53 | funcstack -= (argc - NREG_ARGS); | |
54 | ||
55 | ucp->uc_mcontext.__gregs.__usp = (unsigned long) funcstack; | |
56 | ucp->uc_mcontext.__gregs.__pc = (unsigned long) func; | |
57 | ||
58 | /* Exit to startcontext() with the next context in R9. */ | |
59 | ucp->uc_mcontext.__gregs.__regs[5] = (unsigned long) ucp->uc_link; | |
60 | ucp->uc_mcontext.__gregs.__lr = (unsigned long) __startcontext; | |
61 | ||
62 | /* The first four arguments go into registers. */ | |
63 | regptr = &(ucp->uc_mcontext.__gregs.__a0); | |
64 | ||
65 | for (reg = 0; (reg < argc) && (reg < NREG_ARGS); reg++) | |
66 | *regptr++ = va_arg (vl, unsigned long); | |
67 | ||
68 | /* And the remainder on the stack. */ | |
69 | for (; reg < argc; reg++) | |
70 | *funcstack++ = va_arg (vl, unsigned long); | |
71 | ||
72 | va_end (vl); | |
73 | } | |
74 | weak_alias (__makecontext, makecontext) |