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7498d7676d
There are a few .set mips* assembler directives used in the MIPS specific
sysdep code that force an instruction to be assembled for a specific ISA.
The reason for these is to allow an instruction to be encoded when it might
not be supported in the current ISA (when the code is run the Linux kernel
will trap and emulate any unsupported instructions). Unfortunately forcing
a specific ISA means that when assembling for a newer ISA, where the
instruction has a different encoding, the wrong encoding will be used.
* sysdeps/mips/bits/atomic.h [_MIPS_SIM == _ABIO32] (MIPS_PUSH_MIPS2):
Only use .set mips2 if the current ISA is below mips2.
* sysdeps/mips/sys/tas.h [_MIPS_SIM == _ABIO32] (_test_and_set):
Likewise.
* sysdeps/mips/nptl/tls.h (READ_THREAD_POINTER): Only use .set
mips32r2 if the current ISA is below mips32r2.
* sysdeps/mips/tls-macros.h (TLS_RDHWR): New define.
(TLS_IE): Updated to use the TLD_RDHWR macro.
(TLS_LE): Likewise.
* sysdeps/unix/mips/sysdep.h (__mips_isa_rev): Moved out of #ifdef
__ASSEMBLER__ condition.
196 lines
6.1 KiB
C
196 lines
6.1 KiB
C
/* Definition for thread-local data handling. NPTL/MIPS version.
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Copyright (C) 2005-2015 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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#ifndef _TLS_H
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#define _TLS_H 1
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#include <dl-sysdep.h>
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#ifndef __ASSEMBLER__
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# include <stdbool.h>
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# include <stddef.h>
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# include <stdint.h>
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/* Get system call information. */
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# include <sysdep.h>
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/* Type for the dtv. */
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typedef union dtv
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{
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size_t counter;
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struct
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{
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void *val;
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bool is_static;
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} pointer;
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} dtv_t;
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#ifdef __mips16
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/* MIPS16 uses GCC builtin to access the TP. */
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# define READ_THREAD_POINTER() (__builtin_thread_pointer ())
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#else
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/* Note: rd must be $v1 to be ABI-conformant. */
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# if __mips_isa_rev >= 2
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# define READ_THREAD_POINTER() \
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({ void *__result; \
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asm volatile ("rdhwr\t%0, $29" : "=v" (__result)); \
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__result; })
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# else
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# define READ_THREAD_POINTER() \
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({ void *__result; \
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asm volatile (".set\tpush\n\t.set\tmips32r2\n\t" \
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"rdhwr\t%0, $29\n\t.set\tpop" : "=v" (__result)); \
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__result; })
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# endif
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#endif
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#else /* __ASSEMBLER__ */
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# include <tcb-offsets.h>
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# if __mips_isa_rev >= 2
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# define READ_THREAD_POINTER(rd) rdhwr rd, $29
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# else
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# define READ_THREAD_POINTER(rd) \
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.set push; \
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.set mips32r2; \
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rdhwr rd, $29; \
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.set pop
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# endif
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#endif /* __ASSEMBLER__ */
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#ifndef __ASSEMBLER__
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/* The TP points to the start of the thread blocks. */
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# define TLS_DTV_AT_TP 1
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# define TLS_TCB_AT_TP 0
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/* Get the thread descriptor definition. */
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# include <nptl/descr.h>
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typedef struct
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{
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dtv_t *dtv;
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void *private;
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} tcbhead_t;
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/* This is the size of the initial TCB. Because our TCB is before the thread
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pointer, we don't need this. */
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# define TLS_INIT_TCB_SIZE 0
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/* Alignment requirements for the initial TCB. */
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# define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
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/* This is the size of the TCB. Because our TCB is before the thread
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pointer, we don't need this. */
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# define TLS_TCB_SIZE 0
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/* Alignment requirements for the TCB. */
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# define TLS_TCB_ALIGN __alignof__ (struct pthread)
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/* This is the size we need before TCB - actually, it includes the TCB. */
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# define TLS_PRE_TCB_SIZE \
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(sizeof (struct pthread) \
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+ ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))
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/* The thread pointer (in hardware register $29) points to the end of
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the TCB + 0x7000, as for PowerPC. The pthread_descr structure is
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immediately in front of the TCB. */
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# define TLS_TCB_OFFSET 0x7000
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/* Install the dtv pointer. The pointer passed is to the element with
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index -1 which contain the length. */
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# define INSTALL_DTV(tcbp, dtvp) \
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(((tcbhead_t *) (tcbp))[-1].dtv = (dtvp) + 1)
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/* Install new dtv for current thread. */
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# define INSTALL_NEW_DTV(dtv) \
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(THREAD_DTV() = (dtv))
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/* Return dtv of given thread descriptor. */
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# define GET_DTV(tcbp) \
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(((tcbhead_t *) (tcbp))[-1].dtv)
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/* Code to initially initialize the thread pointer. This might need
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special attention since 'errno' is not yet available and if the
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operation can cause a failure 'errno' must not be touched. */
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# define TLS_INIT_TP(tcbp) \
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({ INTERNAL_SYSCALL_DECL (err); \
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long result_var; \
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result_var = INTERNAL_SYSCALL (set_thread_area, err, 1, \
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(char *) (tcbp) + TLS_TCB_OFFSET); \
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INTERNAL_SYSCALL_ERROR_P (result_var, err) \
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? "unknown error" : NULL; })
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/* Value passed to 'clone' for initialization of the thread register. */
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# define TLS_DEFINE_INIT_TP(tp, pd) \
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void *tp = (void *) (pd) + TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE
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/* Return the address of the dtv for the current thread. */
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# define THREAD_DTV() \
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(((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))[-1].dtv)
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/* Return the thread descriptor for the current thread. */
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# define THREAD_SELF \
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((struct pthread *) (READ_THREAD_POINTER () \
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- TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))
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/* Magic for libthread_db to know how to do THREAD_SELF. */
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# define DB_THREAD_SELF \
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CONST_THREAD_AREA (32, TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE)
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/* Access to data in the thread descriptor is easy. */
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# define THREAD_GETMEM(descr, member) \
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descr->member
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# define THREAD_GETMEM_NC(descr, member, idx) \
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descr->member[idx]
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# define THREAD_SETMEM(descr, member, value) \
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descr->member = (value)
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# define THREAD_SETMEM_NC(descr, member, idx, value) \
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descr->member[idx] = (value)
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/* l_tls_offset == 0 is perfectly valid on MIPS, so we have to use some
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different value to mean unset l_tls_offset. */
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# define NO_TLS_OFFSET -1
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/* Get and set the global scope generation counter in struct pthread. */
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#define THREAD_GSCOPE_FLAG_UNUSED 0
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#define THREAD_GSCOPE_FLAG_USED 1
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#define THREAD_GSCOPE_FLAG_WAIT 2
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#define THREAD_GSCOPE_RESET_FLAG() \
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do \
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{ int __res \
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= atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
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THREAD_GSCOPE_FLAG_UNUSED); \
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if (__res == THREAD_GSCOPE_FLAG_WAIT) \
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lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
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} \
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while (0)
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#define THREAD_GSCOPE_SET_FLAG() \
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do \
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{ \
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THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
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atomic_write_barrier (); \
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} \
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while (0)
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#define THREAD_GSCOPE_WAIT() \
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GL(dl_wait_lookup_done) ()
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#endif /* __ASSEMBLER__ */
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#endif /* tls.h */
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