1 /* Machine dependent pthreads code. Hurd/i386 version.
2 Copyright (C) 2000-2022 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 #include <errno.h>
20
21 #include <mach.h>
22 #include <mach/i386/thread_status.h>
23 #include <mach/i386/mach_i386.h>
24 #include <mach/mig_errors.h>
25 #include <mach/thread_status.h>
26
27 #define HURD_TLS_DESC_DECL(desc, tcb) \
28 struct descriptor desc = \
29 { /* low word: */ \
30 0xffff /* limit 0..15 */ \
31 | (((unsigned int) (tcb)) << 16) /* base 0..15 */ \
32 , /* high word: */ \
33 ((((unsigned int) (tcb)) >> 16) & 0xff) /* base 16..23 */ \
34 | ((0x12 | 0x60 | 0x80) << 8) /* access = ACC_DATA_W|ACC_PL_U|ACC_P */ \
35 | (0xf << 16) /* limit 16..19 */ \
36 | ((4 | 8) << 20) /* granularity = SZ_32|SZ_G */ \
37 | (((unsigned int) (tcb)) & 0xff000000) /* base 24..31 */ \
38 }
39
40 int
__thread_set_pcsptp(thread_t thread,int set_ip,void * ip,int set_sp,void * sp,int set_tp,void * tp)41 __thread_set_pcsptp (thread_t thread,
42 int set_ip, void *ip,
43 int set_sp, void *sp,
44 int set_tp, void *tp)
45 {
46 error_t err;
47 struct i386_thread_state state;
48 mach_msg_type_number_t state_count;
49
50 state_count = i386_THREAD_STATE_COUNT;
51
52 err = __thread_get_state (thread, i386_REGS_SEGS_STATE,
53 (thread_state_t) &state, &state_count);
54 if (err)
55 return err;
56
57 if (set_sp)
58 state.uesp = (unsigned int) sp;
59 if (set_ip)
60 state.eip = (unsigned int) ip;
61 if (set_tp)
62 {
63 HURD_TLS_DESC_DECL (desc, tp);
64 int sel;
65
66 asm ("mov %%gs, %w0": "=q" (sel):"0" (0));
67 if (__builtin_expect (sel, 0x48) & 4) /* LDT selector */
68 err = __i386_set_ldt (thread, sel, &desc, 1);
69 else
70 err = __i386_set_gdt (thread, &sel, desc);
71 if (err)
72 return err;
73 state.gs = sel;
74 }
75
76 err = __thread_set_state (thread, i386_REGS_SEGS_STATE,
77 (thread_state_t) &state, i386_THREAD_STATE_COUNT);
78 if (err)
79 return err;
80
81 return 0;
82 }
83