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1 | /* Generic definitions for dealing with Mach thread states. |
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2 | Copyright (C) 1994-2022 Free Software Foundation, Inc. |
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 |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | |
20 | /* Everything else is called `thread_state', but CMU's header file is |
21 | called `thread_status'. Oh boy. */ |
22 | #include <mach/thread_status.h> |
23 | |
24 | /* The machine-dependent thread_state.h file can either define these |
25 | macros, or just define PC and SP to the register names. */ |
26 | |
27 | #ifndef MACHINE_THREAD_STATE_SET_PC |
28 | #define MACHINE_THREAD_STATE_SET_PC(ts, pc) \ |
29 | ((ts)->PC = (unsigned long int) (pc)) |
30 | #endif |
31 | #ifndef MACHINE_THREAD_STATE_SET_SP |
32 | #ifdef STACK_GROWTH_UP |
33 | #define MACHINE_THREAD_STATE_SET_SP(ts, stack, size) \ |
34 | ((ts)->SP = (unsigned long int) (stack)) |
35 | #else |
36 | #define MACHINE_THREAD_STATE_SET_SP(ts, stack, size) \ |
37 | ((ts)->SP = (unsigned long int) (stack) + (size)) |
38 | #endif |
39 | #endif |
40 | |
41 | /* This copies architecture-specific bits from the current thread to the new |
42 | thread state. */ |
43 | #ifndef MACHINE_THREAD_STATE_FIX_NEW |
44 | # define MACHINE_THREAD_STATE_FIX_NEW(ts) |
45 | #endif |
46 | |
47 | /* These functions are of use in machine-dependent signal trampoline |
48 | implementations. */ |
49 | |
50 | #include <string.h> /* size_t, memcpy */ |
51 | #include <mach/mach_interface.h> /* __thread_get_state */ |
52 | |
53 | static inline int |
54 | machine_get_state (thread_t thread, struct machine_thread_all_state *state, |
55 | int flavor, void *stateptr, void *scpptr, size_t size) |
56 | { |
57 | if (state->set & (1 << flavor)) |
58 | { |
59 | /* Copy the saved state. */ |
60 | memcpy (scpptr, stateptr, size); |
61 | return 1; |
62 | } |
63 | else |
64 | { |
65 | /* No one asked about this flavor of state before; fetch the state |
66 | directly from the kernel into the sigcontext. */ |
67 | mach_msg_type_number_t got = (size / sizeof (int)); |
68 | return (! __thread_get_state (thread, flavor, scpptr, &got) |
69 | && got == (size / sizeof (int))); |
70 | } |
71 | } |
72 | |
73 | static inline int |
74 | machine_get_basic_state (thread_t thread, |
75 | struct machine_thread_all_state *state) |
76 | { |
77 | mach_msg_type_number_t count; |
78 | |
79 | if (state->set & (1 << MACHINE_THREAD_STATE_FLAVOR)) |
80 | return 1; |
81 | |
82 | count = MACHINE_THREAD_STATE_COUNT; |
83 | if (__thread_get_state (thread, MACHINE_THREAD_STATE_FLAVOR, |
84 | (natural_t *) &state->basic, |
85 | &count) != KERN_SUCCESS |
86 | || count != MACHINE_THREAD_STATE_COUNT) |
87 | /* What kind of thread?? */ |
88 | return 0; /* XXX */ |
89 | |
90 | state->set |= 1 << MACHINE_THREAD_STATE_FLAVOR; |
91 | return 1; |
92 | } |
93 |
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