| /* Copyright (C) 2011-2014 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/>. */ |
| |
| #define _SYS_AUXV_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; \ |
| .size name, . - name |
| |
| #undef LOC |
| #define LOC(name) .L##name |
| |
| #endif /* __ASSEMBLER__ */ |