projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d4697bc9 | 1 | /* Copyright (C) 2011-2014 Free Software Foundation, Inc. |
| 5f4318d1 DM |
2 | This file is part of the GNU C Library. |
| 3 | ||
| 4 | The GNU C Library is free software; you can redistribute it and/or | |
| 5 | modify it under the terms of the GNU Lesser General Public | |
| 6 | License as published by the Free Software Foundation; either | |
| 7 | version 2.1 of the License, or (at your option) any later version. | |
| 8 | ||
| 9 | The GNU C Library is distributed in the hope that it will be useful, | |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 | Lesser General Public License for more details. | |
| 13 | ||
| 14 | You should have received a copy of the GNU Lesser General Public | |
| 59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. */ | |
| 5f4318d1 | 17 | |
| c7683a6d RH |
18 | #define _SYS_AUXV_H 1 |
| 19 | #include <bits/hwcap.h> | |
| aab39a09 DM |
20 | |
| 21 | #ifdef __ASSEMBLER__ | |
| 22 | ||
| 23 | #define SPARC_PIC_THUNK(reg) \ | |
| 24 | .ifndef __sparc_get_pc_thunk.reg; \ | |
| 25 | .section .text.__sparc_get_pc_thunk.reg,"axG",@progbits,__sparc_get_pc_thunk.reg,comdat; \ | |
| 26 | .align 32; \ | |
| 27 | .weak __sparc_get_pc_thunk.reg; \ | |
| 28 | .hidden __sparc_get_pc_thunk.reg; \ | |
| 29 | .type __sparc_get_pc_thunk.reg, #function; \ | |
| 30 | __sparc_get_pc_thunk.reg: \ | |
| 31 | jmp %o7 + 8; \ | |
| 32 | add %o7, %reg, %##reg; \ | |
| 33 | .previous; \ | |
| 34 | .endif; | |
| 35 | ||
| 7f18b530 DM |
36 | /* The "-4" and "+4" offsets against _GLOBAL_OFFSET_TABLE_ are |
| 37 | critical since they represent the offset from the thunk call to the | |
| 38 | instruction containing the _GLOBAL_OFFSET_TABLE_ reference. | |
| 39 | Therefore these instructions cannot be moved around without | |
| 40 | appropriate adjustments to those offsets. | |
| 41 | ||
| 42 | Furthermore, these expressions are special in another regard. When | |
| 43 | the assembler sees a reference to _GLOBAL_OFFSET_TABLE_ inside of | |
| 44 | a %hi() or %lo(), it emits a PC-relative relocation. This causes | |
| 45 | R_SPARC_HI22 to turn into R_SPARC_PC22, and R_SPARC_LO10 to turn into | |
| 46 | R_SPARC_PC10, respectively. | |
| 47 | ||
| 48 | Even when v9 we use a call sequence instead of using "rd %pc" because | |
| aab39a09 DM |
49 | RDPC is extremely expensive and incurs a full pipeline flush. */ |
| 50 | ||
| 7f18b530 | 51 | #define SPARC_PIC_THUNK_CALL(reg) \ |
| aab39a09 DM |
52 | sethi %hi(_GLOBAL_OFFSET_TABLE_-4), %##reg; \ |
| 53 | call __sparc_get_pc_thunk.reg; \ | |
| 54 | or %##reg, %lo(_GLOBAL_OFFSET_TABLE_+4), %##reg; | |
| 55 | ||
| 7f18b530 DM |
56 | #define SETUP_PIC_REG(reg) \ |
| 57 | SPARC_PIC_THUNK(reg) \ | |
| 58 | SPARC_PIC_THUNK_CALL(reg) | |
| 59 | ||
| aab39a09 DM |
60 | #define SETUP_PIC_REG_LEAF(reg, tmp) \ |
| 61 | SPARC_PIC_THUNK(reg) \ | |
| aab39a09 | 62 | mov %o7, %##tmp; \ |
| 7f18b530 | 63 | SPARC_PIC_THUNK_CALL(reg); \ |
| aab39a09 DM |
64 | mov %##tmp, %o7; |
| 65 | ||
| 66 | #undef ENTRY | |
| 67 | #define ENTRY(name) \ | |
| 68 | .align 4; \ | |
| 69 | .global C_SYMBOL_NAME(name); \ | |
| 70 | .type name, @function; \ | |
| 71 | C_LABEL(name) \ | |
| 72 | cfi_startproc; | |
| 73 | ||
| 74 | #undef END | |
| 75 | #define END(name) \ | |
| 76 | cfi_endproc; \ | |
| 77 | .size name, . - name | |
| 78 | ||
| 79 | #undef LOC | |
| 80 | #define LOC(name) .L##name | |
| 81 | ||
| 82 | #endif /* __ASSEMBLER__ */ |