[PATCH v7 04/13] LoongArch: Thread-Local Storage Support
Adhemerval Zanella Netto
adhemerval.zanella@linaro.org
Wed Jul 20 14:34:24 GMT 2022
LGTM, thanks.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
On 18/07/22 22:20, caiyinyu wrote:
> ---
> sysdeps/loongarch/dl-tls.h | 46 ++++++++++++
> sysdeps/loongarch/libc-tls.c | 32 ++++++++
> sysdeps/loongarch/nptl/tls.h | 138 ++++++++++++++++++++++++++++++++++
> sysdeps/loongarch/stackinfo.h | 33 ++++++++
> 4 files changed, 249 insertions(+)
> create mode 100644 sysdeps/loongarch/dl-tls.h
> create mode 100644 sysdeps/loongarch/libc-tls.c
> create mode 100644 sysdeps/loongarch/nptl/tls.h
> create mode 100644 sysdeps/loongarch/stackinfo.h
>
> diff --git a/sysdeps/loongarch/dl-tls.h b/sysdeps/loongarch/dl-tls.h
> new file mode 100644
> index 0000000000..f82edcae76
> --- /dev/null
> +++ b/sysdeps/loongarch/dl-tls.h
> @@ -0,0 +1,46 @@
> +/* Thread-local storage handling in the ELF dynamic linker.
> + Copyright (C) 2022 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/>. */
> +
> +/* Type used for the representation of TLS information in the GOT. */
> +typedef struct
> +{
> + unsigned long int ti_module;
> + unsigned long int ti_offset;
> +} tls_index;
> +
> +/* The thread pointer points to the first static TLS block. */
> +#define TLS_TP_OFFSET 0
> +
> +/* Dynamic thread vector pointers point to the start of each
> + TLS block. */
> +#define TLS_DTV_OFFSET 0
> +
> +/* Compute the value for a GOTTPREL reloc. */
> +#define TLS_TPREL_VALUE(sym_map, sym) \
> + ((sym_map)->l_tls_offset + (sym)->st_value - TLS_TP_OFFSET)
> +
> +/* Compute the value for a DTPREL reloc. */
> +#define TLS_DTPREL_VALUE(sym) ((sym)->st_value - TLS_DTV_OFFSET)
> +
> +extern void *__tls_get_addr (tls_index *ti);
> +
> +#define GET_ADDR_OFFSET (ti->ti_offset + TLS_DTV_OFFSET)
> +#define __TLS_GET_ADDR(__ti) (__tls_get_addr (__ti) - TLS_DTV_OFFSET)
> +
> +/* Value used for dtv entries for which the allocation is delayed. */
> +#define TLS_DTV_UNALLOCATED ((void *) -1l)
Ok.
> diff --git a/sysdeps/loongarch/libc-tls.c b/sysdeps/loongarch/libc-tls.c
> new file mode 100644
> index 0000000000..9285d11a7b
> --- /dev/null
> +++ b/sysdeps/loongarch/libc-tls.c
> @@ -0,0 +1,32 @@
> +/* Thread-local storage handling in the ELF dynamic linker.
> + Copyright (C) 2022 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/>. */
> +
> +#include <csu/libc-tls.c>
> +#include <dl-tls.h>
> +
> +/* On LoongArch, linker optimizations are not required, so __tls_get_addr
> + can be called even in statically linked binaries. In this case module
> + must be always 1 and PT_TLS segment exist in the binary, otherwise it
> + would not link. */
> +
> +void *
> +__tls_get_addr (tls_index *ti)
> +{
> + dtv_t *dtv = THREAD_DTV ();
> + return (char *) dtv[1].pointer.val + GET_ADDR_OFFSET;
> +}
Ok.
> diff --git a/sysdeps/loongarch/nptl/tls.h b/sysdeps/loongarch/nptl/tls.h
> new file mode 100644
> index 0000000000..3b271c4b60
> --- /dev/null
> +++ b/sysdeps/loongarch/nptl/tls.h
> @@ -0,0 +1,138 @@
> +/* Definition for thread-local data handling.
> + Copyright (C) 2022 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 _LOONGARCH_TLS_H
> +#define _LOONGARCH_TLS_H 1
> +
> +#include <dl-sysdep.h>
> +
> +#ifndef __ASSEMBLER__
> +#include <stdbool.h>
> +#include <stddef.h>
> +#include <stdint.h>
> +#include <dl-dtv.h>
> +
> +register void *__thread_self asm ("$tp");
> +#define READ_THREAD_POINTER() ({ __thread_self; })
> +
> +/* Get system call information. */
> +#include <sysdep.h>
> +
> +/* The TP points to the start of the thread blocks. */
> +#define TLS_DTV_AT_TP 1
> +#define TLS_TCB_AT_TP 0
> +
> +/* Get the thread descriptor definition. */
> +#include <nptl/descr.h>
> +
> +typedef struct
> +{
> + dtv_t *dtv;
> + void *private;
> +} tcbhead_t;
> +
> +/* This is the size of the initial TCB. Because our TCB is before the thread
> + pointer, we don't need this. */
> +#define TLS_INIT_TCB_SIZE 0
> +
> +/* Alignment requirements for the initial TCB. */
> +#define TLS_INIT_TCB_ALIGN __alignof__(struct pthread)
> +
> +/* This is the size of the TCB. Because our TCB is before the thread
> + pointer, we don't need this. */
> +#define TLS_TCB_SIZE 0
> +
> +/* Alignment requirements for the TCB. */
> +#define TLS_TCB_ALIGN __alignof__(struct pthread)
> +
> +/* This is the size we need before TCB - actually, it includes the TCB. */
> +#define TLS_PRE_TCB_SIZE \
> + (sizeof (struct pthread) \
> + + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))
> +
> +/* The thread pointer tp points to the end of the TCB.
> + The pthread_descr structure is immediately in front of the TCB. */
> +#define TLS_TCB_OFFSET 0
> +
> +/* Install the dtv pointer. The pointer passed is to the element with
> + index -1 which contain the length. */
> +#define INSTALL_DTV(tcbp, dtvp) (((tcbhead_t *) (tcbp))[-1].dtv = (dtvp) + 1)
> +
> +/* Install new dtv for current thread. */
> +#define INSTALL_NEW_DTV(dtv) (THREAD_DTV () = (dtv))
> +
> +/* Return dtv of given thread descriptor. */
> +#define GET_DTV(tcbp) (((tcbhead_t *) (tcbp))[-1].dtv)
> +
> +/* Code to initially initialize the thread pointer. */
> +#define TLS_INIT_TP(tcbp) \
> + ({ \
> + __thread_self = (char *) tcbp + TLS_TCB_OFFSET; \
> + NULL; \
> + })
> +
> +/* Return the address of the dtv for the current thread. */
> +#define THREAD_DTV() \
> + (((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))[-1].dtv)
> +
> +/* Return the thread descriptor for the current thread. */
> +#define THREAD_SELF \
> + ((struct pthread *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET \
> + - TLS_PRE_TCB_SIZE))
> +
> +/* Value passed to 'clone' for initialization of the thread register. */
> +#define TLS_DEFINE_INIT_TP(tp, pd) \
> + void *tp = (void *) (pd) + TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE
> +
> +/* Informs libthread_db that the thread pointer is register 2, which is used
> + * to know how to do THREAD_SELF. */
> +#define DB_THREAD_SELF \
> + REGISTER (64, 64, 2 * 8, -TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)
> +
> +/* Access to data in the thread descriptor is easy. */
> +# include <tcb-access.h>
> +
> +/* l_tls_offset == 0 is perfectly valid, so we have to use some different
> + value to mean unset l_tls_offset. */
> +#define NO_TLS_OFFSET -1
> +
> +/* Get and set the global scope generation counter in struct pthread. */
> +#define THREAD_GSCOPE_IN_TCB 1
> +#define THREAD_GSCOPE_FLAG_UNUSED 0
> +#define THREAD_GSCOPE_FLAG_USED 1
> +#define THREAD_GSCOPE_FLAG_WAIT 2
> +#define THREAD_GSCOPE_RESET_FLAG() \
> + do \
> + { \
> + int __res = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
> + THREAD_GSCOPE_FLAG_UNUSED); \
> + if (__res == THREAD_GSCOPE_FLAG_WAIT) \
> + lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
> + } \
> + while (0)
> +#define THREAD_GSCOPE_SET_FLAG() \
> + do \
> + { \
> + THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
> + atomic_write_barrier (); \
> + } \
> + while (0)
> +
> +#endif /* __ASSEMBLER__ */
> +
> +#endif /* tls.h */
Ok.
> diff --git a/sysdeps/loongarch/stackinfo.h b/sysdeps/loongarch/stackinfo.h
> new file mode 100644
> index 0000000000..ff8b9b7bf2
> --- /dev/null
> +++ b/sysdeps/loongarch/stackinfo.h
> @@ -0,0 +1,33 @@
> +/* Stack environment definitions for LoongArch.
> + Copyright (C) 2022 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/>. */
> +
> +/* This file contains a bit of information about the stack allocation
> + of the processor. */
> +
> +#ifndef _STACKINFO_H
> +#define _STACKINFO_H 1
> +
> +#include <elf.h>
> +
> +/* On LoongArch the stack grows down. */
> +#define _STACK_GROWS_DOWN 1
> +
> +/* Default to a non-executable stack. */
> +#define DEFAULT_STACK_PERMS (PF_R | PF_W)
> +
> +#endif /* stackinfo.h */
Ok.
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