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/* Machine dependent pthreads code. Hurd/i386 version.
Copyright (C) 2000-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <mach.h>
#include <mach/i386/thread_status.h>
#include <mach/i386/mach_i386.h>
#include <mach/mig_errors.h>
#include <mach/thread_status.h>
#define HURD_TLS_DESC_DECL(desc, tcb) \
struct descriptor desc = \
{ /* low word: */ \
0xffff /* limit 0..15 */ \
| (((unsigned int) (tcb)) << 16) /* base 0..15 */ \
, /* high word: */ \
((((unsigned int) (tcb)) >> 16) & 0xff) /* base 16..23 */ \
| ((0x12 | 0x60 | 0x80) << 8) /* access = ACC_DATA_W|ACC_PL_U|ACC_P */ \
| (0xf << 16) /* limit 16..19 */ \
| ((4 | 8) << 20) /* granularity = SZ_32|SZ_G */ \
| (((unsigned int) (tcb)) & 0xff000000) /* base 24..31 */ \
}
int
__thread_set_pcsptp (thread_t thread,
int set_ip, void *ip,
int set_sp, void *sp,
int set_tp, void *tp)
{
error_t err;
struct i386_thread_state state;
mach_msg_type_number_t state_count;
state_count = i386_THREAD_STATE_COUNT;
err = __thread_get_state (thread, i386_REGS_SEGS_STATE,
(thread_state_t) &state, &state_count);
if (err)
return err;
if (set_sp)
state.uesp = (unsigned int) sp;
if (set_ip)
state.eip = (unsigned int) ip;
if (set_tp)
{
HURD_TLS_DESC_DECL (desc, tp);
int sel;
asm ("mov %%gs, %w0": "=q" (sel):"0" (0));
if (__builtin_expect (sel, 0x48) & 4) /* LDT selector */
err = __i386_set_ldt (thread, sel, &desc, 1);
else
err = __i386_set_gdt (thread, &sel, desc);
if (err)
return err;
state.gs = sel;
}
err = __thread_set_state (thread, i386_REGS_SEGS_STATE,
(thread_state_t) &state, i386_THREAD_STATE_COUNT);
if (err)
return err;
return 0;
}
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