diff options
Diffstat (limited to 'sysdeps/mach/hurd/i386/tls.h')
| -rw-r--r-- | sysdeps/mach/hurd/i386/tls.h | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/sysdeps/mach/hurd/i386/tls.h b/sysdeps/mach/hurd/i386/tls.h deleted file mode 100644 index 74b444ef19..0000000000 --- a/sysdeps/mach/hurd/i386/tls.h +++ /dev/null @@ -1,169 +0,0 @@ -/* Definitions for thread-local data handling. Hurd/i386 version. - Copyright (C) 2003-2017 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 - <http://www.gnu.org/licenses/>. */ - -#ifndef _I386_TLS_H -#define _I386_TLS_H - - -/* Some things really need not be machine-dependent. */ -#include <sysdeps/mach/hurd/tls.h> - - -#ifndef __ASSEMBLER__ -# include <dl-dtv.h> - -/* Type of the TCB. */ -typedef struct -{ - void *tcb; /* Points to this structure. */ - dtv_t *dtv; /* Vector of pointers to TLS data. */ - thread_t self; /* This thread's control port. */ - int multiple_threads; - uintptr_t sysinfo; - uintptr_t stack_guard; - uintptr_t pointer_guard; - int gscope_flag; - int private_futex; - /* Reservation of some values for the TM ABI. */ - void *__private_tm[4]; - /* GCC split stack support. */ - void *__private_ss; -} tcbhead_t; -#endif - - -/* The TCB can have any size and the memory following the address the - thread pointer points to is unspecified. Allocate the TCB there. */ -#define TLS_TCB_AT_TP 1 -#define TLS_DTV_AT_TP 0 - -#ifndef __ASSEMBLER__ - -/* Use i386-specific RPCs to arrange that %gs segment register prefix - addresses the TCB in each thread. */ -# include <mach/i386/mach_i386.h> - -# ifndef HAVE_I386_SET_GDT -# define __i386_set_gdt(thr, sel, desc) ((void) (thr), (void) (sel), (void) (desc), MIG_BAD_ID) -# endif - -# include <errno.h> -# include <assert.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 */ \ - } - - -static inline const char * __attribute__ ((unused)) -_hurd_tls_init (tcbhead_t *tcb) -{ - HURD_TLS_DESC_DECL (desc, tcb); - - /* This field is used by TLS accesses to get our "thread pointer" - from the TLS point of view. */ - tcb->tcb = tcb; - - /* Cache our thread port. */ - tcb->self = __mach_thread_self (); - - /* Get the first available selector. */ - int sel = -1; - error_t err = __i386_set_gdt (tcb->self, &sel, desc); - if (err == MIG_BAD_ID) - { - /* Old kernel, use a per-thread LDT. */ - sel = 0x27; - err = __i386_set_ldt (tcb->self, sel, &desc, 1); - assert_perror (err); - if (err) - return "i386_set_ldt failed"; - } - else if (err) - { - assert_perror (err); /* Separate from above with different line #. */ - return "i386_set_gdt failed"; - } - - /* Now install the new selector. */ - asm volatile ("mov %w0, %%gs" :: "q" (sel)); - - return 0; -} - -/* Code to initially initialize the thread pointer. This might need - special attention since 'errno' is not yet available and if the - operation can cause a failure 'errno' must not be touched. */ -# define TLS_INIT_TP(descr) \ - _hurd_tls_init ((tcbhead_t *) (descr)) - -/* Return the TCB address of the current thread. */ -# define THREAD_SELF \ - ({ tcbhead_t *__tcb; \ - __asm__ ("movl %%gs:%c1,%0" : "=r" (__tcb) \ - : "i" (offsetof (tcbhead_t, tcb))); \ - __tcb;}) - -/* Install new dtv for current thread. */ -# define INSTALL_NEW_DTV(dtvp) \ - ({ asm volatile ("movl %0,%%gs:%P1" \ - : : "ir" (dtvp), "i" (offsetof (tcbhead_t, dtv))); }) - -/* Return the address of the dtv for the current thread. */ -# define THREAD_DTV() \ - ({ dtv_t *_dtv; \ - asm ("movl %%gs:%P1,%0" : "=q" (_dtv) : "i" (offsetof (tcbhead_t, dtv)));\ - _dtv; }) - -# include <mach/machine/thread_status.h> - -/* Set up TLS in the new thread of a fork child, copying from our own. */ -static inline error_t __attribute__ ((unused)) -_hurd_tls_fork (thread_t child, struct i386_thread_state *state) -{ - /* Fetch the selector set by _hurd_tls_init. */ - int sel; - asm ("mov %%gs, %w0" : "=q" (sel) : "0" (0)); - if (sel == state->ds) /* _hurd_tls_init was never called. */ - return 0; - - tcbhead_t *const tcb = THREAD_SELF; - HURD_TLS_DESC_DECL (desc, tcb); - error_t err; - - if (__builtin_expect (sel, 0x50) & 4) /* LDT selector */ - err = __i386_set_ldt (child, sel, &desc, 1); - else - err = __i386_set_gdt (child, &sel, desc); - - state->gs = sel; - return err; -} - -#endif /* !__ASSEMBLER__ */ - -#endif /* i386/tls.h */ |