blob: 4241f9182cab43a9b71bdb6d7f66c4526a3baafe (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
/* Copyright (C) 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David Bartley <dtbartle@csclub.uwaterloo.ca>, 2008.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#define LWPGS_SEL 0x01C3
static int
create_thread_arch (ucontext_t *ctx, struct pthread *pd,
const struct pthread_attr *attr, STACK_VARIABLES_PARMS)
{
/* Clone the segment registers (except gs - see below). */
ucontext_t _ctx;
_ctx.uc_flags = UC_CPU;
if (getcontext(&_ctx) != 0)
return errno;
ctx->uc_mcontext.gregs[CS] = _ctx.uc_mcontext.gregs[CS];
ctx->uc_mcontext.gregs[DS] = _ctx.uc_mcontext.gregs[DS];
ctx->uc_mcontext.gregs[ES] = _ctx.uc_mcontext.gregs[ES];
ctx->uc_mcontext.gregs[FS] = _ctx.uc_mcontext.gregs[FS];
ctx->uc_mcontext.gregs[SS] = _ctx.uc_mcontext.gregs[SS];
/* Setup the stack (note that it grows down). */
uint32_t *stack_ptr = (uint32_t *)((uintptr_t)((uint32_t *)stackaddr - 1) &
~(STACK_ALIGN - 1)) + 1;
*--stack_ptr = (uint32_t)pd; /* arg 1 */
*--stack_ptr = 0; /* return addr (thread_start never returns) */
ctx->uc_mcontext.gregs[UESP] = (greg_t)stack_ptr;
ctx->uc_mcontext.gregs[EBP] = 0;
ctx->uc_mcontext.gregs[EIP] = (greg_t)start_thread;
ctx->uc_flags |= UC_CPU;
/* This is a hack to get the kernel to set gs for us. */
ctx->uc_mcontext.gregs[GS] = (greg_t)LWPGS_SEL;
ctx->uc_mcontext.gregs[ESP] = (greg_t)pd;
return 0;
}
|
