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0722d7c2ac
* sysdeps/unix/sparc/sysdep.h: Document why we don't use "rd %pc" in the PIC register setup sequences.
96 lines
3.0 KiB
C
96 lines
3.0 KiB
C
/* Copyright (C) 1993, 1994, 1995, 1997, 2003, 2011, 2012
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdeps/unix/sysdep.h>
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#include <sysdeps/sparc/sysdep.h>
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#ifdef __ASSEMBLER__
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/* Since C identifiers are not normally prefixed with an underscore
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on this system, the asm identifier `syscall_error' intrudes on the
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C name space. Make sure we use an innocuous name. */
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#define syscall_error C_SYMBOL_NAME(__syscall_error)
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#define SPARC_PIC_THUNK(reg) \
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.ifndef __sparc_get_pc_thunk.reg; \
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.section .text.__sparc_get_pc_thunk.reg,"axG",@progbits,__sparc_get_pc_thunk.reg,comdat; \
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.align 32; \
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.weak __sparc_get_pc_thunk.reg; \
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.hidden __sparc_get_pc_thunk.reg; \
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.type __sparc_get_pc_thunk.reg, #function; \
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__sparc_get_pc_thunk.reg: \
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jmp %o7 + 8; \
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add %o7, %reg, %##reg; \
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.previous; \
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.endif;
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/* Even when v9 we use a call sequence instead of using "rd %pc" because
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RDPC is extremely expensive and incurs a full pipeline flush. */
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#define SETUP_PIC_REG(reg) \
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SPARC_PIC_THUNK(reg) \
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sethi %hi(_GLOBAL_OFFSET_TABLE_-4), %##reg; \
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call __sparc_get_pc_thunk.reg; \
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or %##reg, %lo(_GLOBAL_OFFSET_TABLE_+4), %##reg;
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#define SETUP_PIC_REG_LEAF(reg, tmp) \
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SPARC_PIC_THUNK(reg) \
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sethi %hi(_GLOBAL_OFFSET_TABLE_-4), %##reg; \
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mov %o7, %##tmp; \
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call __sparc_get_pc_thunk.reg; \
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or %##reg, %lo(_GLOBAL_OFFSET_TABLE_+4), %##reg; \
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mov %##tmp, %o7;
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#define ENTRY(name) \
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.global C_SYMBOL_NAME(name); \
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.type name,@function; \
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.align 4; \
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C_LABEL(name)
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#define PSEUDO(name, syscall_name, args) \
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.global syscall_error; \
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ENTRY (name) \
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mov SYS_ify(syscall_name), %g1; \
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ta 0; \
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bcc 1f; \
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sethi %hi(syscall_error), %g1; \
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jmp %g1 + %lo(syscall_error); nop; \
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1:
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#define PSEUDO_NOERRNO(name, syscall_name, args) \
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.global syscall_error; \
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ENTRY (name) \
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mov SYS_ify(syscall_name), %g1; \
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ta 0
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#define PSEUDO_ERRVAL(name, syscall_name, args) \
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.global syscall_error; \
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ENTRY (name) \
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mov SYS_ify(syscall_name), %g1; \
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ta 0
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#define ret retl; nop
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#define ret_NOERRNO retl; nop
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#define ret_ERRVAL retl; nop
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#define r0 %o0
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#define r1 %o1
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#define MOVE(x,y) mov x, y
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#endif /* __ASSEMBLER__ */
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