diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/kvx/tls.h')
| -rw-r--r-- | libpthread/nptl/sysdeps/kvx/tls.h | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/kvx/tls.h b/libpthread/nptl/sysdeps/kvx/tls.h new file mode 100644 index 000000000..a3e7fa97b --- /dev/null +++ b/libpthread/nptl/sysdeps/kvx/tls.h @@ -0,0 +1,160 @@ +/* + * This file is subject to the terms and conditions of the LGPL V2.1 + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2019 Kalray Inc. + */ + +#ifndef _TLS_H +#define _TLS_H 1 + +#ifndef __ASSEMBLER__ +# include <stdbool.h> +# include <stddef.h> +# include <stdint.h> + +/* Type for the dtv. */ +typedef union dtv +{ + size_t counter; + struct + { + void *val; + bool is_static; + } pointer; +} dtv_t; + +#else /* __ASSEMBLER__ */ +# include <tcb-offsets.h> +#endif /* __ASSEMBLER__ */ + +/* We require TLS support in the tools. */ +#define HAVE_TLS_SUPPORT 1 +#define HAVE_TLS_MODEL_ATTRIBUTE 1 +#define HAVE___THREAD 1 + +/* Signal that TLS support is available. */ +#define USE_TLS 1 + +#ifndef __ASSEMBLER__ + +/* Get system call information. */ +# include <sysdep.h> + +/* The TP points to the start of the thread blocks. */ +# define TLS_DTV_AT_TP 1 + +/* Get the thread descriptor definition. */ +# include <../../descr.h> + +typedef struct +{ + dtv_t *dtv; +} tcbhead_t; + +/* Thread Pointer $tp is $r13 */ +register tcbhead_t *__thread_self __asm__("$r13"); + +/* This is the size of the initial TCB. */ +# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) + +/* Alignment requirements for the initial TCB. */ +# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t) + +/* This is the size of the TCB. */ +# define TLS_TCB_SIZE sizeof (tcbhead_t) + +/* This is the size we need before TCB. */ +# define TLS_PRE_TCB_SIZE sizeof (struct pthread) + +/* Alignment requirements for the TCB. */ +# define TLS_TCB_ALIGN __alignof__ (tcbhead_t) + +/* 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))->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))->dtv) + +/* Code to initially initialize the thread pointer. + * + * Set TP to the address _after_ tcbhead_t. This will allow us + * to change the size of tcbhead_t without having to re-link everything. + * + * secondcall has something to do with USE__THREAD, + * seems to always be 0 so we don't care about it. + * + * This has to return NULL on success (or a string with the failure text). + * It's hard to fail this, so return NULL always. + */ +# define TLS_INIT_TP(tcbp, secondcall) \ + ({__thread_self = ((tcbhead_t *)tcbp + 1); NULL;}) + +/* Return the address of the dtv for the current thread. + * + * Dereference TP, offset to dtv - really straightforward. + * Remember that we made TP point to after tcb, so we need to reverse that. + */ +# define THREAD_DTV() \ + ((((tcbhead_t *)__thread_self)-1)->dtv) + +/* Return the thread descriptor for the current thread. + * + * Return a pointer to the TLS_PRE area where we allocated space for + * a struct pthread. Again, TP points to after tcbhead_t, compensate with + * TLS_INIT_TCB_SIZE. + * + * I regard this is a seperate system from the "normal" TLS. + */ +# define THREAD_SELF \ + ((struct pthread *) ((char *) __thread_self - TLS_INIT_TCB_SIZE \ + - TLS_PRE_TCB_SIZE)) + +/* Magic for libthread_db to know how to do THREAD_SELF. */ +# define DB_THREAD_SELF \ + CONST_THREAD_AREA (64, sizeof (struct pthread)) + +/* Access to data in the thread descriptor is easy. */ +# define THREAD_GETMEM(descr, member) \ + descr->member +# define THREAD_GETMEM_NC(descr, member, idx) \ + descr->member[idx] +# define THREAD_SETMEM(descr, member, value) \ + descr->member = (value) +# define THREAD_SETMEM_NC(descr, member, idx, value) \ + descr->member[idx] = (value) + +/* Get and set the global scope generation counter in struct pthread. */ +# 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) +# define THREAD_GSCOPE_WAIT() \ + GL(dl_wait_lookup_done) () + +# endif /* __ASSEMBLER__ */ + +#endif /* tls.h */ |