/* Copyright (C) 2011-2018 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/>.  */

#include_next <sysdep.h>

#define _SYSDEPS_SYSDEP_H 1
#include <bits/hwcap.h>

#ifdef  __ASSEMBLER__

#define SPARC_PIC_THUNK(reg)                                            \
        .ifndef __sparc_get_pc_thunk.reg;                               \
        .section .text.__sparc_get_pc_thunk.reg,"axG",@progbits,__sparc_get_pc_thunk.reg,comdat; \
        .align   32;                                                    \
        .weak    __sparc_get_pc_thunk.reg;                              \
        .hidden  __sparc_get_pc_thunk.reg;                              \
        .type    __sparc_get_pc_thunk.reg, #function;                   \
__sparc_get_pc_thunk.reg:                                               \
        jmp     %o7 + 8;                                                \
         add    %o7, %reg, %##reg;                                      \
        .previous;                                                      \
        .endif;

/* The "-4" and "+4" offsets against _GLOBAL_OFFSET_TABLE_ are
   critical since they represent the offset from the thunk call to the
   instruction containing the _GLOBAL_OFFSET_TABLE_ reference.
   Therefore these instructions cannot be moved around without
   appropriate adjustments to those offsets.

   Furthermore, these expressions are special in another regard.  When
   the assembler sees a reference to _GLOBAL_OFFSET_TABLE_ inside of
   a %hi() or %lo(), it emits a PC-relative relocation.  This causes
   R_SPARC_HI22 to turn into R_SPARC_PC22, and R_SPARC_LO10 to turn into
   R_SPARC_PC10, respectively.

   Even when v9 we use a call sequence instead of using "rd %pc" because
   RDPC is extremely expensive and incurs a full pipeline flush.  */

#define SPARC_PIC_THUNK_CALL(reg)                                       \
        sethi   %hi(_GLOBAL_OFFSET_TABLE_-4), %##reg;                   \
        call    __sparc_get_pc_thunk.reg;                               \
         or     %##reg, %lo(_GLOBAL_OFFSET_TABLE_+4), %##reg;

#define SETUP_PIC_REG(reg)                                              \
        SPARC_PIC_THUNK(reg)                                            \
        SPARC_PIC_THUNK_CALL(reg)

#define SETUP_PIC_REG_LEAF(reg, tmp)                                    \
        SPARC_PIC_THUNK(reg)                                            \
        mov     %o7, %##tmp;                                            \
        SPARC_PIC_THUNK_CALL(reg);                                      \
        mov     %##tmp, %o7;

#undef ENTRY
#define ENTRY(name)                     \
        .align  4;                      \
        .global C_SYMBOL_NAME(name);    \
        .type   name, @function;        \
C_LABEL(name)                           \
        cfi_startproc;

#undef END
#define END(name)                       \
        cfi_endproc;

#undef LOC
#define LOC(name)  .L##name

#endif  /* __ASSEMBLER__ */

/* This is the offset from the %sp to the backing store above the
 *    register windows.  So if you poke stack memory directly you add this.  */
#define STACK_BIAS      2047