| Message ID | 20200423014126.10417-4-vgupta@synopsys.com |
|---|---|
| State | New |
| Headers | show |
| Series | glibc port to ARC processors | expand |
On 22/04/2020 22:41, Vineet Gupta via Libc-alpha wrote: > This includes all 4 TLS addressing models > > Signed-off-by: Vineet Gupta <vgupta@synopsys.com> As prior patch we do not use DCO, but rather copyright assignment. Looks ok in general, with some comments below. > --- > sysdeps/arc/dl-tls.h | 30 +++++++ > sysdeps/arc/libc-tls.c | 27 ++++++ > sysdeps/arc/nptl/tcb-offsets.sym | 11 +++ > sysdeps/arc/nptl/tls.h | 150 +++++++++++++++++++++++++++++++ > sysdeps/arc/stackinfo.h | 33 +++++++ > 5 files changed, 251 insertions(+) > create mode 100644 sysdeps/arc/dl-tls.h > create mode 100644 sysdeps/arc/libc-tls.c > create mode 100644 sysdeps/arc/nptl/tcb-offsets.sym > create mode 100644 sysdeps/arc/nptl/tls.h > create mode 100644 sysdeps/arc/stackinfo.h > > diff --git a/sysdeps/arc/dl-tls.h b/sysdeps/arc/dl-tls.h > new file mode 100644 > index 000000000000..2269ac6c3daa > --- /dev/null > +++ b/sysdeps/arc/dl-tls.h > @@ -0,0 +1,30 @@ > +/* Thread-local storage handling in the ELF dynamic linker. ARC version. > + Copyright (C) 2012-2020 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; > + > +extern void *__tls_get_addr (tls_index *ti); > + > +/* Value used for dtv entries for which the allocation is delayed. */ > +#define TLS_DTV_UNALLOCATED ((void *) -1l) Ok. > diff --git a/sysdeps/arc/libc-tls.c b/sysdeps/arc/libc-tls.c > new file mode 100644 > index 000000000000..ec88282de60e > --- /dev/null > +++ b/sysdeps/arc/libc-tls.c > @@ -0,0 +1,27 @@ > +/* Thread-local storage handling in the ELF dynamic linker. ARC version. > + Copyright (C) 2005-2020 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> > + > +void * > +__tls_get_addr (tls_index *ti) > +{ > + dtv_t *dtv = THREAD_DTV (); > + return (char *) dtv[1].pointer.val + ti->ti_offset; > +} Ok. > diff --git a/sysdeps/arc/nptl/tcb-offsets.sym b/sysdeps/arc/nptl/tcb-offsets.sym > new file mode 100644 > index 000000000000..64c432c22e76 > --- /dev/null > +++ b/sysdeps/arc/nptl/tcb-offsets.sym > @@ -0,0 +1,11 @@ > +#include <sysdep.h> > +#include <tls.h> > + > +-- Derive offsets relative to the thread register. > +#define thread_offsetof(mem) (long)(offsetof (struct pthread, mem) - sizeof (struct pthread)) > + > +MULTIPLE_THREADS_OFFSET offsetof (struct pthread, header.multiple_threads) > +TLS_PRE_TCB_SIZE sizeof (struct pthread) > +TLS_TCB_SIZE sizeof (tcbhead_t) > + > +PTHREAD_TID offsetof (struct pthread, tid) Ok. > diff --git a/sysdeps/arc/nptl/tls.h b/sysdeps/arc/nptl/tls.h > new file mode 100644 > index 000000000000..a836af121a85 > --- /dev/null > +++ b/sysdeps/arc/nptl/tls.h > @@ -0,0 +1,150 @@ > +/* Definition for thread-local data handling. NPTL/ARC version. > + Copyright (C) 2012-2020 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 _ARC_NPTL_TLS_H > +#define _ARC_NPTL_TLS_H 1 > + > +#include <dl-sysdep.h> > + > +#ifndef __ASSEMBLER__ > +# include <stdbool.h> > +# include <stddef.h> > +# include <stdint.h> > + > +#include <dl-dtv.h> > + > +/* Get system call information. */ > +# include <sysdep.h> > + > +/* The TLS blocks start right after the TCB. */ > +# 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; > + uintptr_t pointer_guard; > +} tcbhead_t; > + > +register struct pthread *__thread_self __asm__("r25"); This is used on other ports, but I am not sure if this is a valid definition for a global variable. Usually the register specifier is used as an input for inline assembly. Do we really need this global on ARC port? Couldn't we replace it with __builtin_thread_pointer where applicable? > + > +/* 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__ (struct pthread) > + > +/* This is the size of the TCB. */ > +#ifndef TLS_TCB_SIZE > +# define TLS_TCB_SIZE sizeof (tcbhead_t) > +#endif > + > +/* 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) > + > +/* 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. */ > +# define TLS_INIT_TP(tcbp) \ > + ({ \ > + long result_var; \ > + __builtin_set_thread_pointer (tcbp); \ > + result_var = INTERNAL_SYSCALL (arc_settls, 1, (tcbp)); \ > + INTERNAL_SYSCALL_ERROR_P (result_var) \ > + ? "settls syscall error" : NULL; \ > + }) > + > +/* Value passed to 'clone' for initialization of the thread register. */ > +# define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1 > + > +/* Return the address of the dtv for the current thread. */ > +# define THREAD_DTV() \ > + (((tcbhead_t *) __builtin_thread_pointer ())->dtv) > + > +/* Return the thread descriptor for the current thread. */ > +# define THREAD_SELF \ > + ((struct pthread *)__builtin_thread_pointer () - 1) > + > +/* Magic for libthread_db to know how to do THREAD_SELF. */ > +# define DB_THREAD_SELF \ > + CONST_THREAD_AREA (32, 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_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) > +#define THREAD_GSCOPE_WAIT() \ > + GL(dl_wait_lookup_done) () > + > +#else > + > +# include <tcb-offsets.h> > + > +# r25 is dedicated TLS register for ARC > +.macro THREAD_SELF reg > + # struct pthread is just ahead of TCB > + sub \reg, r25, TLS_PRE_TCB_SIZE > +.endm > + > +#endif /* __ASSEMBLER__ */ > + > +#endif /* tls.h */ Ok. > diff --git a/sysdeps/arc/stackinfo.h b/sysdeps/arc/stackinfo.h > new file mode 100644 > index 000000000000..911efd928675 > --- /dev/null > +++ b/sysdeps/arc/stackinfo.h > @@ -0,0 +1,33 @@ > +/* Stack environment definitions for ARC. > + Copyright (C) 2012-2020 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 ARC 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.
On 5/27/20 12:17 PM, Adhemerval Zanella via Libc-alpha wrote: > > > On 22/04/2020 22:41, Vineet Gupta via Libc-alpha wrote: >> This includes all 4 TLS addressing models >> >> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> > > As prior patch we do not use DCO, but rather copyright assignment. > > Looks ok in general, with some comments below. >> + >> +register struct pthread *__thread_self __asm__("r25"); > > This is used on other ports, but I am not sure if this is a valid definition > for a global variable. Not valid from gcc implementation POV ? The syntax seems to work alright in ARC linux kernel where we use r25 to cache the current task pointer. > Usually the register specifier is used as an input > for inline assembly. Do we really need this global on ARC port? Couldn't > we replace it with __builtin_thread_pointer where applicable? We do use __builtin_thread_pointer and actually __thread_self is not used in ARC port :-) so I can just drop it Many thx for reviewing. -Vineet
On 27/05/2020 22:36, Vineet Gupta wrote: > On 5/27/20 12:17 PM, Adhemerval Zanella via Libc-alpha wrote: >> >> >> On 22/04/2020 22:41, Vineet Gupta via Libc-alpha wrote: >>> This includes all 4 TLS addressing models >>> >>> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> >> >> As prior patch we do not use DCO, but rather copyright assignment. >> >> Looks ok in general, with some comments below. > >>> + >>> +register struct pthread *__thread_self __asm__("r25"); >> >> This is used on other ports, but I am not sure if this is a valid definition >> for a global variable. > > Not valid from gcc implementation POV ? The syntax seems to work alright in ARC > linux kernel where we use r25 to cache the current task pointer. The gcc documentation [1] does specify register global variables, but it also states that "[...] it is recommended that you choose a register that is normally saved and restored by function calls on your machine, so that calls to library routines will not clobber it." So I see that the semantic of global register is kind fragile and since it is usage is solely for asm inline argument I don't see a very compelling reason to keep using it. [1] https://gcc.gnu.org/onlinedocs/gcc/Local-Register-Variables.html > >> Usually the register specifier is used as an input >> for inline assembly. Do we really need this global on ARC port? Couldn't >> we replace it with __builtin_thread_pointer where applicable? > > We do use __builtin_thread_pointer and actually __thread_self is not used in ARC > port :-) so I can just drop it Ack. > > Many thx for reviewing. > -Vineet >
diff --git a/sysdeps/arc/dl-tls.h b/sysdeps/arc/dl-tls.h new file mode 100644 index 000000000000..2269ac6c3daa --- /dev/null +++ b/sysdeps/arc/dl-tls.h @@ -0,0 +1,30 @@ +/* Thread-local storage handling in the ELF dynamic linker. ARC version. + Copyright (C) 2012-2020 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; + +extern void *__tls_get_addr (tls_index *ti); + +/* Value used for dtv entries for which the allocation is delayed. */ +#define TLS_DTV_UNALLOCATED ((void *) -1l) diff --git a/sysdeps/arc/libc-tls.c b/sysdeps/arc/libc-tls.c new file mode 100644 index 000000000000..ec88282de60e --- /dev/null +++ b/sysdeps/arc/libc-tls.c @@ -0,0 +1,27 @@ +/* Thread-local storage handling in the ELF dynamic linker. ARC version. + Copyright (C) 2005-2020 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> + +void * +__tls_get_addr (tls_index *ti) +{ + dtv_t *dtv = THREAD_DTV (); + return (char *) dtv[1].pointer.val + ti->ti_offset; +} diff --git a/sysdeps/arc/nptl/tcb-offsets.sym b/sysdeps/arc/nptl/tcb-offsets.sym new file mode 100644 index 000000000000..64c432c22e76 --- /dev/null +++ b/sysdeps/arc/nptl/tcb-offsets.sym @@ -0,0 +1,11 @@ +#include <sysdep.h> +#include <tls.h> + +-- Derive offsets relative to the thread register. +#define thread_offsetof(mem) (long)(offsetof (struct pthread, mem) - sizeof (struct pthread)) + +MULTIPLE_THREADS_OFFSET offsetof (struct pthread, header.multiple_threads) +TLS_PRE_TCB_SIZE sizeof (struct pthread) +TLS_TCB_SIZE sizeof (tcbhead_t) + +PTHREAD_TID offsetof (struct pthread, tid) diff --git a/sysdeps/arc/nptl/tls.h b/sysdeps/arc/nptl/tls.h new file mode 100644 index 000000000000..a836af121a85 --- /dev/null +++ b/sysdeps/arc/nptl/tls.h @@ -0,0 +1,150 @@ +/* Definition for thread-local data handling. NPTL/ARC version. + Copyright (C) 2012-2020 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 _ARC_NPTL_TLS_H +#define _ARC_NPTL_TLS_H 1 + +#include <dl-sysdep.h> + +#ifndef __ASSEMBLER__ +# include <stdbool.h> +# include <stddef.h> +# include <stdint.h> + +#include <dl-dtv.h> + +/* Get system call information. */ +# include <sysdep.h> + +/* The TLS blocks start right after the TCB. */ +# 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; + uintptr_t pointer_guard; +} tcbhead_t; + +register struct pthread *__thread_self __asm__("r25"); + +/* 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__ (struct pthread) + +/* This is the size of the TCB. */ +#ifndef TLS_TCB_SIZE +# define TLS_TCB_SIZE sizeof (tcbhead_t) +#endif + +/* 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) + +/* 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. */ +# define TLS_INIT_TP(tcbp) \ + ({ \ + long result_var; \ + __builtin_set_thread_pointer (tcbp); \ + result_var = INTERNAL_SYSCALL (arc_settls, 1, (tcbp)); \ + INTERNAL_SYSCALL_ERROR_P (result_var) \ + ? "settls syscall error" : NULL; \ + }) + +/* Value passed to 'clone' for initialization of the thread register. */ +# define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1 + +/* Return the address of the dtv for the current thread. */ +# define THREAD_DTV() \ + (((tcbhead_t *) __builtin_thread_pointer ())->dtv) + +/* Return the thread descriptor for the current thread. */ +# define THREAD_SELF \ + ((struct pthread *)__builtin_thread_pointer () - 1) + +/* Magic for libthread_db to know how to do THREAD_SELF. */ +# define DB_THREAD_SELF \ + CONST_THREAD_AREA (32, 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_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) +#define THREAD_GSCOPE_WAIT() \ + GL(dl_wait_lookup_done) () + +#else + +# include <tcb-offsets.h> + +# r25 is dedicated TLS register for ARC +.macro THREAD_SELF reg + # struct pthread is just ahead of TCB + sub \reg, r25, TLS_PRE_TCB_SIZE +.endm + +#endif /* __ASSEMBLER__ */ + +#endif /* tls.h */ diff --git a/sysdeps/arc/stackinfo.h b/sysdeps/arc/stackinfo.h new file mode 100644 index 000000000000..911efd928675 --- /dev/null +++ b/sysdeps/arc/stackinfo.h @@ -0,0 +1,33 @@ +/* Stack environment definitions for ARC. + Copyright (C) 2012-2020 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 ARC 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 */
This includes all 4 TLS addressing models Signed-off-by: Vineet Gupta <vgupta@synopsys.com> --- sysdeps/arc/dl-tls.h | 30 +++++++ sysdeps/arc/libc-tls.c | 27 ++++++ sysdeps/arc/nptl/tcb-offsets.sym | 11 +++ sysdeps/arc/nptl/tls.h | 150 +++++++++++++++++++++++++++++++ sysdeps/arc/stackinfo.h | 33 +++++++ 5 files changed, 251 insertions(+) create mode 100644 sysdeps/arc/dl-tls.h create mode 100644 sysdeps/arc/libc-tls.c create mode 100644 sysdeps/arc/nptl/tcb-offsets.sym create mode 100644 sysdeps/arc/nptl/tls.h create mode 100644 sysdeps/arc/stackinfo.h