diff options
Diffstat (limited to 'REORG.TODO/sysdeps/sparc/sysdep.h')
| -rw-r--r-- | REORG.TODO/sysdeps/sparc/sysdep.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/sparc/sysdep.h b/REORG.TODO/sysdeps/sparc/sysdep.h new file mode 100644 index 0000000000..245e5cc57f --- /dev/null +++ b/REORG.TODO/sysdeps/sparc/sysdep.h @@ -0,0 +1,82 @@ +/* Copyright (C) 2011-2017 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 _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; \ + .size name, . - name + +#undef LOC +#define LOC(name) .L##name + +#endif /* __ASSEMBLER__ */ |