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04277e02d7
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83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
/* Machine dependent pthreads code. Hurd/i386 version.
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Copyright (C) 2000-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <mach.h>
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#include <mach/i386/thread_status.h>
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#include <mach/i386/mach_i386.h>
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#include <mach/mig_errors.h>
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#include <mach/thread_status.h>
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#define HURD_TLS_DESC_DECL(desc, tcb) \
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struct descriptor desc = \
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{ /* low word: */ \
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0xffff /* limit 0..15 */ \
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| (((unsigned int) (tcb)) << 16) /* base 0..15 */ \
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, /* high word: */ \
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((((unsigned int) (tcb)) >> 16) & 0xff) /* base 16..23 */ \
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| ((0x12 | 0x60 | 0x80) << 8) /* access = ACC_DATA_W|ACC_PL_U|ACC_P */ \
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| (0xf << 16) /* limit 16..19 */ \
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| ((4 | 8) << 20) /* granularity = SZ_32|SZ_G */ \
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| (((unsigned int) (tcb)) & 0xff000000) /* base 24..31 */ \
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}
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int
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__thread_set_pcsptp (thread_t thread,
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int set_ip, void *ip,
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int set_sp, void *sp,
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int set_tp, void *tp)
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{
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error_t err;
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struct i386_thread_state state;
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mach_msg_type_number_t state_count;
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state_count = i386_THREAD_STATE_COUNT;
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err = __thread_get_state (thread, i386_REGS_SEGS_STATE,
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(thread_state_t) &state, &state_count);
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if (err)
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return err;
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if (set_sp)
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state.uesp = (unsigned int) sp;
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if (set_ip)
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state.eip = (unsigned int) ip;
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if (set_tp)
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{
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HURD_TLS_DESC_DECL (desc, tp);
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int sel;
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asm ("mov %%gs, %w0": "=q" (sel):"0" (0));
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if (__builtin_expect (sel, 0x48) & 4) /* LDT selector */
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err = __i386_set_ldt (thread, sel, &desc, 1);
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else
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err = __i386_set_gdt (thread, &sel, desc);
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if (err)
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return err;
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state.gs = sel;
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}
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err = __thread_set_state (thread, i386_REGS_SEGS_STATE,
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(thread_state_t) &state, i386_THREAD_STATE_COUNT);
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if (err)
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return err;
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return 0;
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}
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