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1 | /* Copyright (C) 2011-2022 Free Software Foundation, Inc. |
---|---|
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 |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #define _SYSDEPS_SYSDEP_H 1 |
19 | #include <bits/hwcap.h> |
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 | |
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 |
49 | RDPC is extremely expensive and incurs a full pipeline flush. */ |
50 | |
51 | #define SPARC_PIC_THUNK_CALL(reg) \ |
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 | |
56 | #define SETUP_PIC_REG(reg) \ |
57 | SPARC_PIC_THUNK(reg) \ |
58 | SPARC_PIC_THUNK_CALL(reg) |
59 | |
60 | #define SETUP_PIC_REG_LEAF(reg, tmp) \ |
61 | SPARC_PIC_THUNK(reg) \ |
62 | mov %o7, %##tmp; \ |
63 | SPARC_PIC_THUNK_CALL(reg); \ |
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__ */ |
83 |
Warning: That file was not part of the compilation database. It may have many parsing errors.