diff options
Diffstat (limited to 'libc/sysdeps/linux/sparc64/sysdep.h')
| -rw-r--r-- | libc/sysdeps/linux/sparc64/sysdep.h | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sparc64/sysdep.h b/libc/sysdeps/linux/sparc64/sysdep.h new file mode 100644 index 000000000..31008c34b --- /dev/null +++ b/libc/sysdeps/linux/sparc64/sysdep.h @@ -0,0 +1,139 @@ +/* Copyright (C) 1997-2017 Free Software Foundation, Inc. + Contributed by Richard Henderson <richard@gnu.ai.mit.edu>, 1997. + + 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/>. */ + +#ifndef _LINUX_SPARC64_SYSDEP_H +#define _LINUX_SPARC64_SYSDEP_H 1 + +#include <common/sysdep.h> + +#undef SYS_ify +#define SYS_ify(syscall_name) __NR_##syscall_name + +#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; + + +#define LOADSYSCALL(x) mov __NR_##x, %g1 + +#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 + +#define LOC(name) .L##name + +#undef PSEUDO +#define PSEUDO(name, syscall_name, args) \ + .text; \ +ENTRY(name); \ + LOADSYSCALL(syscall_name); \ + ta 0x6d; \ + bcc,pt %xcc, 1f; \ + nop; \ + SYSCALL_ERROR_HANDLER \ +1: + +#undef PSEUDO_NOERRNO +#define PSEUDO_NOERRNO(name, syscall_name, args)\ + .text; \ +ENTRY(name); \ + LOADSYSCALL(syscall_name); \ + ta 0x6d; + +#undef PSEUDO_ERRVAL +#define PSEUDO_ERRVAL(name, syscall_name, args) \ + .text; \ +ENTRY(name); \ + LOADSYSCALL(syscall_name); \ + ta 0x6d; + +#undef PSEUDO_END +#define PSEUDO_END(name) \ + END(name) + +#ifndef __PIC__ +# define SYSCALL_ERROR_HANDLER \ + mov %o7, %g1; \ + call __syscall_error; \ + mov %g1, %o7; +#else +# define SYSCALL_ERROR_HANDLER \ +0: SETUP_PIC_REG_LEAF(o2,g1) \ + sethi %gdop_hix22(errno), %g1;\ + xor %g1, %gdop_lox10(errno), %g1;\ + ldx [%o2 + %g1], %g1, %gdop(errno);\ + st %o0, [%g1]; \ + jmp %o7 + 8; \ + mov -1, %o0; +#endif /* PIC */ + +#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 + +#endif |