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RISC-V: Thread-Local Storage Support
This patch implements TLS support for RISC-V. We support all four standard TLS addressing modes (LE, IE, LD, and GD) when running on Linux via NPTL. There is a draft psABI document that defines our TLS ABI here https://github.com/riscv/riscv-elf-psabi-doc/blob/master/riscv-elf.md#thread-local-storage 2018-01-29 Palmer Dabbelt <palmer@sifive.com> * sysdeps/riscv/dl-tls.h: New file. * sysdeps/riscv/libc-tls.c: Likewise. * sysdeps/riscv/nptl/tcb-offsets.sym: Likewise. * sysdeps/riscv/nptl/tls.h: Likewise. * sysdeps/riscv/stackinfo.h: Likewise.
This commit is contained in:
Palmer Dabbelt
parent
c776fa113d
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337126607f
@ -22,6 +22,11 @@
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* sysdeps/riscv/setjmp.S: Likewise.
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* sysdeps/riscv/sys/asm.h: Likewise.
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* sysdeps/riscv/tls-macros.h: Likewise.
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* sysdeps/riscv/dl-tls.h: New file.
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* sysdeps/riscv/libc-tls.c: Likewise.
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* sysdeps/riscv/nptl/tcb-offsets.sym: Likewise.
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* sysdeps/riscv/nptl/tls.h: Likewise.
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* sysdeps/riscv/stackinfo.h: Likewise.
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2018-01-29 Florian Weimer <fweimer@redhat.com>
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48
sysdeps/riscv/dl-tls.h
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48
sysdeps/riscv/dl-tls.h
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/* Thread-local storage handling in the ELF dynamic linker. RISC-V version.
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Copyright (C) 2011-2018 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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/* Type used for the representation of TLS information in the GOT. */
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typedef struct
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{
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unsigned long int ti_module;
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unsigned long int ti_offset;
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} tls_index;
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/* The thread pointer points to the first static TLS block. */
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#define TLS_TP_OFFSET 0
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/* Dynamic thread vector pointers point 0x800 past the start of each
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TLS block. */
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#define TLS_DTV_OFFSET 0x800
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/* Compute the value for a GOTTPREL reloc. */
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#define TLS_TPREL_VALUE(sym_map, sym) \
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((sym_map)->l_tls_offset + (sym)->st_value - TLS_TP_OFFSET)
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/* Compute the value for a DTPREL reloc. */
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#define TLS_DTPREL_VALUE(sym) \
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((sym)->st_value - TLS_DTV_OFFSET)
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extern void *__tls_get_addr (tls_index *ti);
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#define GET_ADDR_OFFSET (ti->ti_offset + TLS_DTV_OFFSET)
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#define __TLS_GET_ADDR(__ti) (__tls_get_addr (__ti) - TLS_DTV_OFFSET)
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/* Value used for dtv entries for which the allocation is delayed. */
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#define TLS_DTV_UNALLOCATED ((void *) -1l)
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32
sysdeps/riscv/libc-tls.c
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32
sysdeps/riscv/libc-tls.c
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/* Thread-local storage handling in the ELF dynamic linker. RISC-V version.
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Copyright (C) 2011-2018 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 <csu/libc-tls.c>
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#include <dl-tls.h>
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/* On RISC-V, linker optimizations are not required, so __tls_get_addr
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can be called even in statically linked binaries. In this case module
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must be always 1 and PT_TLS segment exist in the binary, otherwise it
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would not link. */
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void *
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__tls_get_addr (tls_index *ti)
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{
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dtv_t *dtv = THREAD_DTV ();
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return (char *) dtv[1].pointer.val + GET_ADDR_OFFSET;
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}
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6
sysdeps/riscv/nptl/tcb-offsets.sym
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6
sysdeps/riscv/nptl/tcb-offsets.sym
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#include <sysdep.h>
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#include <tls.h>
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#define thread_offsetof(mem) (long)(offsetof (struct pthread, mem) - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)
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MULTIPLE_THREADS_OFFSET thread_offsetof (header.multiple_threads)
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145
sysdeps/riscv/nptl/tls.h
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145
sysdeps/riscv/nptl/tls.h
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/* Definition for thread-local data handling. NPTL/RISC-V version.
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Copyright (C) 2011-2018 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 _RISCV_TLS_H
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#define _RISCV_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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# include <dl-dtv.h>
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register void *__thread_self asm ("tp");
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# define READ_THREAD_POINTER() ({ __thread_self; })
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/* Get system call information. */
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# include <sysdep.h>
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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 tp points to the end of the TCB.
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The pthread_descr structure is immediately in front of the TCB. */
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# define TLS_TCB_OFFSET 0
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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. */
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# define TLS_INIT_TP(tcbp) \
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({ __thread_self = (char*)tcbp + TLS_TCB_OFFSET; NULL; })
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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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/* 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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/* 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, so we have to use some different
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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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33
sysdeps/riscv/stackinfo.h
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33
sysdeps/riscv/stackinfo.h
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/* Stack environment definitions for RISC-V.
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Copyright (C) 2011-2018 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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/* This file contains a bit of information about the stack allocation
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of the processor. */
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#ifndef _STACKINFO_H
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#define _STACKINFO_H 1
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#include <elf.h>
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/* On RISC-V the stack grows down. */
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#define _STACK_GROWS_DOWN 1
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/* Default to a non-executable stack. */
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#define DEFAULT_STACK_PERMS (PF_R | PF_W)
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#endif /* stackinfo.h */
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