mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-01 17:30:07 +00:00
2b778ceb40
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
375 lines
13 KiB
C
375 lines
13 KiB
C
/* Definitions for thread-local data handling. Hurd/i386 version.
|
|
Copyright (C) 2003-2021 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/>. */
|
|
|
|
#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;
|
|
|
|
/* Keep these fields last, so offsets of fields above can continue being
|
|
compatible with the i386 Linux version. */
|
|
mach_port_t reply_port; /* This thread's reply port. */
|
|
struct hurd_sigstate *_hurd_sigstate;
|
|
} tcbhead_t;
|
|
#endif
|
|
|
|
/* Return tcbhead_t from a TLS segment descriptor. */
|
|
# define HURD_DESC_TLS(desc) \
|
|
({ \
|
|
(tcbhead_t *) ( (desc->low_word >> 16) \
|
|
| ((desc->high_word & 0xff) << 16) \
|
|
| (desc->high_word & 0xff000000)); \
|
|
})
|
|
|
|
/* Return 1 if TLS is not initialized yet. */
|
|
#define __LIBC_NO_TLS() \
|
|
({ unsigned short ds, gs; \
|
|
asm ("movw %%ds,%w0; movw %%gs,%w1" : "=q" (ds), "=q" (gs)); \
|
|
__builtin_expect (ds == gs, 0); })
|
|
|
|
/* 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
|
|
|
|
/* Alignment requirement for TCB.
|
|
|
|
Some processors such as Intel Atom pay a big penalty on every
|
|
access using a segment override if that segment's base is not
|
|
aligned to the size of a cache line. (See Intel 64 and IA-32
|
|
Architectures Optimization Reference Manual, section 13.3.3.3,
|
|
"Segment Base".) On such machines, a cache line is 64 bytes. */
|
|
#define TCB_ALIGNMENT 64
|
|
|
|
#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 */ \
|
|
}
|
|
|
|
# define HURD_SEL_LDT(sel) (__builtin_expect ((sel) & 4, 0))
|
|
|
|
static inline const char * __attribute__ ((unused))
|
|
_hurd_tls_init (tcbhead_t *tcb)
|
|
{
|
|
HURD_TLS_DESC_DECL (desc, tcb);
|
|
thread_t self = __mach_thread_self ();
|
|
const char *msg = NULL;
|
|
|
|
/* This field is used by TLS accesses to get our "thread pointer"
|
|
from the TLS point of view. */
|
|
tcb->tcb = tcb;
|
|
/* We always at least start the sigthread anyway. */
|
|
tcb->multiple_threads = 1;
|
|
|
|
/* Get the first available selector. */
|
|
int sel = -1;
|
|
error_t err = __i386_set_gdt (self, &sel, desc);
|
|
if (err == MIG_BAD_ID)
|
|
{
|
|
/* Old kernel, use a per-thread LDT. */
|
|
sel = 0x27;
|
|
err = __i386_set_ldt (self, sel, &desc, 1);
|
|
assert_perror (err);
|
|
if (err)
|
|
{
|
|
msg = "i386_set_ldt failed";
|
|
goto out;
|
|
}
|
|
}
|
|
else if (err)
|
|
{
|
|
assert_perror (err); /* Separate from above with different line #. */
|
|
msg = "i386_set_gdt failed";
|
|
goto out;
|
|
}
|
|
|
|
/* Now install the new selector. */
|
|
asm volatile ("mov %w0, %%gs" :: "q" (sel));
|
|
|
|
out:
|
|
__mach_port_deallocate (__mach_task_self (), self);
|
|
return msg;
|
|
}
|
|
|
|
/* 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;})
|
|
|
|
/* Read member of the thread descriptor directly. */
|
|
# define THREAD_GETMEM(descr, member) \
|
|
({ __typeof (descr->member) __value; \
|
|
_Static_assert (sizeof (__value) == 1 \
|
|
|| sizeof (__value) == 4 \
|
|
|| sizeof (__value) == 8, \
|
|
"size of per-thread data"); \
|
|
if (sizeof (__value) == 1) \
|
|
asm volatile ("movb %%gs:%P2,%b0" \
|
|
: "=q" (__value) \
|
|
: "0" (0), "i" (offsetof (tcbhead_t, member))); \
|
|
else if (sizeof (__value) == 4) \
|
|
asm volatile ("movl %%gs:%P1,%0" \
|
|
: "=r" (__value) \
|
|
: "i" (offsetof (tcbhead_t, member))); \
|
|
else /* 8 */ \
|
|
{ \
|
|
asm volatile ("movl %%gs:%P1,%%eax\n\t" \
|
|
"movl %%gs:%P2,%%edx" \
|
|
: "=A" (__value) \
|
|
: "i" (offsetof (tcbhead_t, member)), \
|
|
"i" (offsetof (tcbhead_t, member) + 4)); \
|
|
} \
|
|
__value; })
|
|
|
|
|
|
/* Same as THREAD_GETMEM, but the member offset can be non-constant. */
|
|
# define THREAD_GETMEM_NC(descr, member, idx) \
|
|
({ __typeof (descr->member[0]) __value; \
|
|
_Static_assert (sizeof (__value) == 1 \
|
|
|| sizeof (__value) == 4 \
|
|
|| sizeof (__value) == 8, \
|
|
"size of per-thread data"); \
|
|
if (sizeof (__value) == 1) \
|
|
asm volatile ("movb %%gs:%P2(%3),%b0" \
|
|
: "=q" (__value) \
|
|
: "0" (0), "i" (offsetof (tcbhead_t, member[0])), \
|
|
"r" (idx)); \
|
|
else if (sizeof (__value) == 4) \
|
|
asm volatile ("movl %%gs:%P1(,%2,4),%0" \
|
|
: "=r" (__value) \
|
|
: "i" (offsetof (tcbhead_t, member[0])), \
|
|
"r" (idx)); \
|
|
else /* 8 */ \
|
|
{ \
|
|
asm volatile ("movl %%gs:%P1(,%2,8),%%eax\n\t" \
|
|
"movl %%gs:4+%P1(,%2,8),%%edx" \
|
|
: "=&A" (__value) \
|
|
: "i" (offsetof (tcbhead_t, member[0])), \
|
|
"r" (idx)); \
|
|
} \
|
|
__value; })
|
|
|
|
|
|
|
|
/* Set member of the thread descriptor directly. */
|
|
# define THREAD_SETMEM(descr, member, value) \
|
|
({ \
|
|
_Static_assert (sizeof (descr->member) == 1 \
|
|
|| sizeof (descr->member) == 4 \
|
|
|| sizeof (descr->member) == 8, \
|
|
"size of per-thread data"); \
|
|
if (sizeof (descr->member) == 1) \
|
|
asm volatile ("movb %b0,%%gs:%P1" : \
|
|
: "iq" (value), \
|
|
"i" (offsetof (tcbhead_t, member))); \
|
|
else if (sizeof (descr->member) == 4) \
|
|
asm volatile ("movl %0,%%gs:%P1" : \
|
|
: "ir" (value), \
|
|
"i" (offsetof (tcbhead_t, member))); \
|
|
else /* 8 */ \
|
|
{ \
|
|
asm volatile ("movl %%eax,%%gs:%P1\n\t" \
|
|
"movl %%edx,%%gs:%P2" : \
|
|
: "A" ((uint64_t) cast_to_integer (value)), \
|
|
"i" (offsetof (tcbhead_t, member)), \
|
|
"i" (offsetof (tcbhead_t, member) + 4)); \
|
|
}})
|
|
|
|
|
|
/* Same as THREAD_SETMEM, but the member offset can be non-constant. */
|
|
# define THREAD_SETMEM_NC(descr, member, idx, value) \
|
|
({ \
|
|
_Static_assert (sizeof (descr->member[0]) == 1 \
|
|
|| sizeof (descr->member[0]) == 4 \
|
|
|| sizeof (descr->member[0]) == 8, \
|
|
"size of per-thread data"); \
|
|
if (sizeof (descr->member[0]) == 1) \
|
|
asm volatile ("movb %b0,%%gs:%P1(%2)" : \
|
|
: "iq" (value), \
|
|
"i" (offsetof (tcbhead_t, member)), \
|
|
"r" (idx)); \
|
|
else if (sizeof (descr->member[0]) == 4) \
|
|
asm volatile ("movl %0,%%gs:%P1(,%2,4)" : \
|
|
: "ir" (value), \
|
|
"i" (offsetof (tcbhead_t, member)), \
|
|
"r" (idx)); \
|
|
else /* 8 */ \
|
|
{ \
|
|
asm volatile ("movl %%eax,%%gs:%P1(,%2,8)\n\t" \
|
|
"movl %%edx,%%gs:4+%P1(,%2,8)" : \
|
|
: "A" ((uint64_t) cast_to_integer (value)), \
|
|
"i" (offsetof (tcbhead_t, member)), \
|
|
"r" (idx)); \
|
|
}})
|
|
|
|
/* Return the TCB address of a thread given its state.
|
|
Note: this is expensive. */
|
|
# define THREAD_TCB(thread, thread_state) \
|
|
({ int __sel = (thread_state)->basic.gs; \
|
|
struct descriptor __desc, *___desc = &__desc; \
|
|
unsigned int __count = 1; \
|
|
kern_return_t __err; \
|
|
if (HURD_SEL_LDT (__sel)) \
|
|
__err = __i386_get_ldt ((thread), __sel, 1, &___desc, &__count); \
|
|
else \
|
|
__err = __i386_get_gdt ((thread), __sel, &__desc); \
|
|
assert_perror (__err); \
|
|
assert (__count == 1); \
|
|
HURD_DESC_TLS (___desc);})
|
|
|
|
/* 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; })
|
|
|
|
|
|
/* Set the stack guard field in TCB head. */
|
|
#define THREAD_SET_STACK_GUARD(value) \
|
|
THREAD_SETMEM (THREAD_SELF, stack_guard, value)
|
|
#define THREAD_COPY_STACK_GUARD(descr) \
|
|
((descr)->stack_guard \
|
|
= THREAD_GETMEM (THREAD_SELF, stack_guard))
|
|
|
|
/* Set the pointer guard field in the TCB head. */
|
|
#define THREAD_SET_POINTER_GUARD(value) \
|
|
THREAD_SETMEM (THREAD_SELF, pointer_guard, value)
|
|
#define THREAD_COPY_POINTER_GUARD(descr) \
|
|
((descr)->pointer_guard \
|
|
= THREAD_GETMEM (THREAD_SELF, pointer_guard))
|
|
|
|
|
|
# include <mach/machine/thread_status.h>
|
|
|
|
/* Set up TLS in the new thread of a fork child, copying from the original. */
|
|
static inline kern_return_t __attribute__ ((unused))
|
|
_hurd_tls_fork (thread_t child, thread_t orig, 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;
|
|
|
|
struct descriptor desc, *_desc = &desc;
|
|
error_t err;
|
|
unsigned int count = 1;
|
|
|
|
if (HURD_SEL_LDT (sel))
|
|
err = __i386_get_ldt (orig, sel, 1, &_desc, &count);
|
|
else
|
|
err = __i386_get_gdt (orig, sel, &desc);
|
|
|
|
assert_perror (err);
|
|
if (err)
|
|
return err;
|
|
|
|
if (HURD_SEL_LDT (sel))
|
|
err = __i386_set_ldt (child, sel, &desc, 1);
|
|
else
|
|
err = __i386_set_gdt (child, &sel, desc);
|
|
|
|
state->gs = sel;
|
|
return err;
|
|
}
|
|
|
|
static inline kern_return_t __attribute__ ((unused))
|
|
_hurd_tls_new (thread_t child, struct i386_thread_state *state, tcbhead_t *tcb)
|
|
{
|
|
/* 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;
|
|
|
|
HURD_TLS_DESC_DECL (desc, tcb);
|
|
error_t err;
|
|
|
|
tcb->tcb = tcb;
|
|
tcb->self = child;
|
|
|
|
if (HURD_SEL_LDT (sel))
|
|
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 */
|