141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
/* Assembler macros for ARM.
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Copyright (C) 1997, 1998, 2003, 2009, 2010 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdeps/generic/sysdep.h>
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#include <features.h>
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#if (!defined (__ARM_ARCH_2__) && !defined (__ARM_ARCH_3__) \
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&& !defined (__ARM_ARCH_3M__) && !defined (__ARM_ARCH_4__))
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# define __USE_BX__
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#endif
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#ifdef __ASSEMBLER__
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/* Syntactic details of assembler. */
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#ifdef HAVE_ELF
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#define ALIGNARG(log2) log2
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/* For ELF we need the `.type' directive to make shared libs work right. */
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#define ASM_TYPE_DIRECTIVE(name,typearg) .type name,%##typearg;
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#define ASM_SIZE_DIRECTIVE(name) .size name,.-name
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/* In ELF C symbols are asm symbols. */
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#undef NO_UNDERSCORES
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#define NO_UNDERSCORES
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#define PLTJMP(_x) _x##(PLT)
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#else
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#define ALIGNARG(log2) log2
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#define ASM_TYPE_DIRECTIVE(name,type) /* Nothing is specified. */
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#define ASM_SIZE_DIRECTIVE(name) /* Nothing is specified. */
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#define PLTJMP(_x) _x
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#endif
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/* APCS-32 doesn't preserve the condition codes across function call. */
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#ifdef __APCS_32__
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#define LOADREGS(cond, base, reglist...)\
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ldm##cond base,reglist
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#ifdef __USE_BX__
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#define RETINSTR(cond, reg) \
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bx##cond reg
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#define DO_RET(_reg) \
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bx _reg
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#else
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#define RETINSTR(cond, reg) \
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mov##cond pc, reg
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#define DO_RET(_reg) \
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mov pc, _reg
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#endif
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#else /* APCS-26 */
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#define LOADREGS(cond, base, reglist...)\
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ldm##cond base,reglist^
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#define RETINSTR(cond, reg) \
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mov##cond##s pc, reg
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#define DO_RET(_reg) \
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movs pc, _reg
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#endif
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/* Define an entry point visible from C. */
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#define ENTRY(name) \
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ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \
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ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),function) \
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.align ALIGNARG(4); \
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C_LABEL(name) \
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.cfi_sections .debug_frame; \
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cfi_startproc; \
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CALL_MCOUNT
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#undef END
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#define END(name) \
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cfi_endproc; \
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ASM_SIZE_DIRECTIVE(name)
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/* If compiled for profiling, call `mcount' at the start of each function. */
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#ifdef PROF
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/* Call __gnu_mcount_nc if GCC >= 4.4 and abi = EABI. */
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#if __GNUC_PREREQ(4,4) && defined(__ARM_EABI__)
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#define CALL_MCOUNT \
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str lr,[sp, #-4]!; \
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cfi_adjust_cfa_offset (4); \
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cfi_rel_offset (lr, 0); \
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bl PLTJMP(mcount); \
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cfi_adjust_cfa_offset (-4); \
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cfi_restore (lr)
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#else /* else call _mcount */
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#define CALL_MCOUNT \
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str lr,[sp, #-4]!; \
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cfi_adjust_cfa_offset (4); \
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cfi_rel_offset (lr, 0); \
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bl PLTJMP(mcount); \
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ldr lr, [sp], #4; \
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cfi_adjust_cfa_offset (-4); \
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cfi_restore (lr)
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#endif
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#else
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#define CALL_MCOUNT /* Do nothing. */
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#endif
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#ifdef NO_UNDERSCORES
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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 __syscall_error
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#if __GNUC_PREREQ(4,4) && defined(__ARM_EABI__)
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#define mcount __gnu_mcount_nc
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#else
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#define mcount _mcount
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#endif
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#endif
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#if defined(__ARM_EABI__)
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/* Tag_ABI_align8_preserved: This code preserves 8-byte
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alignment in any callee. */
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.eabi_attribute 25, 1
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/* Tag_ABI_align8_needed: This code may require 8-byte alignment from
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the caller. */
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.eabi_attribute 24, 1
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#endif
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#endif /* __ASSEMBLER__ */
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