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Diffstat (limited to 'REORG.TODO/sysdeps/powerpc/nptl/tls.h')
| -rw-r--r-- | REORG.TODO/sysdeps/powerpc/nptl/tls.h | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/powerpc/nptl/tls.h b/REORG.TODO/sysdeps/powerpc/nptl/tls.h new file mode 100644 index 0000000000..7556e7c8b8 --- /dev/null +++ b/REORG.TODO/sysdeps/powerpc/nptl/tls.h @@ -0,0 +1,263 @@ +/* Definition for thread-local data handling. NPTL/PowerPC version. + Copyright (C) 2003-2017 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 + <http://www.gnu.org/licenses/>. */ + +#ifndef _TLS_H +#define _TLS_H 1 + +# include <dl-sysdep.h> + +#ifndef __ASSEMBLER__ +# include <stdbool.h> +# include <stddef.h> +# include <stdint.h> +# include <dl-dtv.h> + +#else /* __ASSEMBLER__ */ +# include <tcb-offsets.h> +#endif /* __ASSEMBLER__ */ + + +#ifndef __ASSEMBLER__ + +# include <hwcapinfo.h> + +/* 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 + +/* We use the multiple_threads field in the pthread struct */ +#define TLS_MULTIPLE_THREADS_IN_TCB 1 + +/* Get the thread descriptor definition. */ +# include <nptl/descr.h> + + +/* The stack_guard is accessed directly by GCC -fstack-protector code, + so it is a part of public ABI. The dtv and pointer_guard fields + are private. */ +typedef struct +{ + /* Reservation for HWCAP data. To be accessed by GCC in + __builtin_cpu_supports(), so it is a part of public ABI. */ + uint64_t hwcap; + /* Reservation for AT_PLATFORM data. To be accessed by GCC in + __builtin_cpu_is(), so it is a part of public ABI. Since there + are different ABIs for 32 and 64 bit, we put this field in a + previously empty padding space for powerpc64. */ +#ifndef __powerpc64__ + /* Padding to maintain alignment. */ + uint32_t padding; + uint32_t at_platform; +#endif + /* Indicate if HTM capable (ISA 2.07). */ + uint32_t tm_capable; + /* Reservation for AT_PLATFORM data - powerpc64. */ +#ifdef __powerpc64__ + uint32_t at_platform; +#endif + /* Reservation for Dynamic System Optimizer ABI. */ + uintptr_t dso_slot2; + uintptr_t dso_slot1; + /* Reservation for tar register (ISA 2.07). */ + uintptr_t tar_save; + /* GCC split stack support. */ + void *__private_ss; + /* Reservation for the Event-Based Branching ABI. */ + uintptr_t ebb_handler; + uintptr_t ebb_ctx_pointer; + uintptr_t ebb_reserved1; + uintptr_t ebb_reserved2; + uintptr_t pointer_guard; + uintptr_t stack_guard; + dtv_t *dtv; +} tcbhead_t; + +/* This is the size of the initial TCB. */ +# 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. */ +# 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. */ +# define TLS_PRE_TCB_SIZE \ + (sizeof (struct pthread) \ + + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1))) + +# ifndef __powerpc64__ +/* Register r2 (tp) is reserved by the ABI as "thread pointer". */ +register void *__thread_register __asm__ ("r2"); +# define PT_THREAD_POINTER PT_R2 +# else +/* Register r13 (tp) is reserved by the ABI as "thread pointer". */ +register void *__thread_register __asm__ ("r13"); +# define PT_THREAD_POINTER PT_R13 +# endif + +/* The following assumes that TP (R2 or R13) points to the end of the + TCB + 0x7000 (per the ABI). This implies that TCB address is + TP - 0x7000. As we define TLS_DTV_AT_TP we can + assume that the pthread struct is allocated immediately ahead of the + TCB. This implies that the pthread_descr address is + TP - (TLS_PRE_TCB_SIZE + 0x7000). */ +# define TLS_TCB_OFFSET 0x7000 + +/* 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. 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(tcbp) \ + ({ \ + __thread_register = (void *) (tcbp) + TLS_TCB_OFFSET; \ + THREAD_SET_TM_CAPABLE (__tcb_hwcap & PPC_FEATURE2_HAS_HTM ? 1 : 0); \ + THREAD_SET_HWCAP (__tcb_hwcap); \ + THREAD_SET_AT_PLATFORM (__tcb_platform); \ + NULL; \ + }) + +/* 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; \ + (((tcbhead_t *) ((char *) tp - TLS_TCB_OFFSET))[-1].tm_capable) = \ + THREAD_GET_TM_CAPABLE (); \ + (((tcbhead_t *) ((char *) tp - TLS_TCB_OFFSET))[-1].hwcap) = \ + THREAD_GET_HWCAP (); \ + (((tcbhead_t *) ((char *) tp - TLS_TCB_OFFSET))[-1].at_platform) = \ + THREAD_GET_AT_PLATFORM (); + +/* Return the address of the dtv for the current thread. */ +# define THREAD_DTV() \ + (((tcbhead_t *) (__thread_register - TLS_TCB_OFFSET))[-1].dtv) + +/* Return the thread descriptor for the current thread. */ +# define THREAD_SELF \ + ((struct pthread *) (__thread_register \ + - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) + +/* Magic for libthread_db to know how to do THREAD_SELF. */ +# define DB_THREAD_SELF \ + REGISTER (32, 32, PT_THREAD_POINTER * 4, \ + - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) \ + REGISTER (64, 64, PT_THREAD_POINTER * 8, \ + - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) + +/* Read member of the thread descriptor directly. */ +# define THREAD_GETMEM(descr, member) ((void)(descr), (THREAD_SELF)->member) + +/* Same as THREAD_GETMEM, but the member offset can be non-constant. */ +# define THREAD_GETMEM_NC(descr, member, idx) \ + ((void)(descr), (THREAD_SELF)->member[idx]) + +/* Set member of the thread descriptor directly. */ +# define THREAD_SETMEM(descr, member, value) \ + ((void)(descr), (THREAD_SELF)->member = (value)) + +/* Same as THREAD_SETMEM, but the member offset can be non-constant. */ +# define THREAD_SETMEM_NC(descr, member, idx, value) \ + ((void)(descr), (THREAD_SELF)->member[idx] = (value)) + +/* Set the stack guard field in TCB head. */ +# define THREAD_SET_STACK_GUARD(value) \ + (((tcbhead_t *) ((char *) __thread_register \ + - TLS_TCB_OFFSET))[-1].stack_guard = (value)) +# define THREAD_COPY_STACK_GUARD(descr) \ + (((tcbhead_t *) ((char *) (descr) \ + + TLS_PRE_TCB_SIZE))[-1].stack_guard \ + = ((tcbhead_t *) ((char *) __thread_register \ + - TLS_TCB_OFFSET))[-1].stack_guard) + +/* Set the stack guard field in TCB head. */ +# define THREAD_GET_POINTER_GUARD() \ + (((tcbhead_t *) ((char *) __thread_register \ + - TLS_TCB_OFFSET))[-1].pointer_guard) +# define THREAD_SET_POINTER_GUARD(value) \ + (THREAD_GET_POINTER_GUARD () = (value)) +# define THREAD_COPY_POINTER_GUARD(descr) \ + (((tcbhead_t *) ((char *) (descr) \ + + TLS_PRE_TCB_SIZE))[-1].pointer_guard \ + = THREAD_GET_POINTER_GUARD()) + +/* tm_capable field in TCB head. */ +# define THREAD_GET_TM_CAPABLE() \ + (((tcbhead_t *) ((char *) __thread_register \ + - TLS_TCB_OFFSET))[-1].tm_capable) +# define THREAD_SET_TM_CAPABLE(value) \ + (THREAD_GET_TM_CAPABLE () = (value)) + +/* hwcap field in TCB head. */ +# define THREAD_GET_HWCAP() \ + (((tcbhead_t *) ((char *) __thread_register \ + - TLS_TCB_OFFSET))[-1].hwcap) +# define THREAD_SET_HWCAP(value) \ + (THREAD_GET_HWCAP () = (value)) + +/* at_platform field in TCB head. */ +# define THREAD_GET_AT_PLATFORM() \ + (((tcbhead_t *) ((char *) __thread_register \ + - TLS_TCB_OFFSET))[-1].at_platform) +# define THREAD_SET_AT_PLATFORM(value) \ + (THREAD_GET_AT_PLATFORM () = (value)) + +/* l_tls_offset == 0 is perfectly valid on PPC, 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_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 */ |