mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 01:40:07 +00:00
124 lines
3.6 KiB
C
124 lines
3.6 KiB
C
/* Assembler macros for ARM.
|
|
Copyright (C) 1997, 1998, 2003, 2009, 2010, 2012
|
|
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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <sysdeps/generic/sysdep.h>
|
|
#include <features.h>
|
|
|
|
#if (!defined (__ARM_ARCH_2__) && !defined (__ARM_ARCH_3__) \
|
|
&& !defined (__ARM_ARCH_3M__) && !defined (__ARM_ARCH_4__))
|
|
# define __USE_BX__
|
|
#endif
|
|
|
|
#ifdef __ASSEMBLER__
|
|
|
|
/* Syntactic details of assembler. */
|
|
|
|
#define ALIGNARG(log2) log2
|
|
/* For ELF we need the `.type' directive to make shared libs work right. */
|
|
#define ASM_TYPE_DIRECTIVE(name,typearg) .type name,%##typearg;
|
|
#define ASM_SIZE_DIRECTIVE(name) .size name,.-name
|
|
|
|
#define PLTJMP(_x) _x##(PLT)
|
|
|
|
/* APCS-32 doesn't preserve the condition codes across function call. */
|
|
#ifdef __APCS_32__
|
|
#define LOADREGS(cond, base, reglist...)\
|
|
ldm##cond base,reglist
|
|
#ifdef __USE_BX__
|
|
#define RETINSTR(cond, reg) \
|
|
bx##cond reg
|
|
#define DO_RET(_reg) \
|
|
bx _reg
|
|
#else
|
|
#define RETINSTR(cond, reg) \
|
|
mov##cond pc, reg
|
|
#define DO_RET(_reg) \
|
|
mov pc, _reg
|
|
#endif
|
|
#else /* APCS-26 */
|
|
#define LOADREGS(cond, base, reglist...)\
|
|
ldm##cond base,reglist^
|
|
#define RETINSTR(cond, reg) \
|
|
mov##cond##s pc, reg
|
|
#define DO_RET(_reg) \
|
|
movs pc, _reg
|
|
#endif
|
|
|
|
/* Define an entry point visible from C. */
|
|
#define ENTRY(name) \
|
|
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \
|
|
ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),function) \
|
|
.align ALIGNARG(4); \
|
|
C_LABEL(name) \
|
|
.cfi_sections .debug_frame; \
|
|
cfi_startproc; \
|
|
CALL_MCOUNT
|
|
|
|
#undef END
|
|
#define END(name) \
|
|
cfi_endproc; \
|
|
ASM_SIZE_DIRECTIVE(name)
|
|
|
|
/* If compiled for profiling, call `mcount' at the start of each function. */
|
|
#ifdef PROF
|
|
/* Call __gnu_mcount_nc if GCC >= 4.4 and abi = EABI. */
|
|
#if __GNUC_PREREQ(4,4) && defined(__ARM_EABI__)
|
|
#define CALL_MCOUNT \
|
|
str lr,[sp, #-4]!; \
|
|
cfi_adjust_cfa_offset (4); \
|
|
cfi_rel_offset (lr, 0); \
|
|
bl PLTJMP(mcount); \
|
|
cfi_adjust_cfa_offset (-4); \
|
|
cfi_restore (lr)
|
|
#else /* else call _mcount */
|
|
#define CALL_MCOUNT \
|
|
str lr,[sp, #-4]!; \
|
|
cfi_adjust_cfa_offset (4); \
|
|
cfi_rel_offset (lr, 0); \
|
|
bl PLTJMP(mcount); \
|
|
ldr lr, [sp], #4; \
|
|
cfi_adjust_cfa_offset (-4); \
|
|
cfi_restore (lr)
|
|
#endif
|
|
#else
|
|
#define CALL_MCOUNT /* Do nothing. */
|
|
#endif
|
|
|
|
/* Since C identifiers are not normally prefixed with an underscore
|
|
on this system, the asm identifier `syscall_error' intrudes on the
|
|
C name space. Make sure we use an innocuous name. */
|
|
#define syscall_error __syscall_error
|
|
#if __GNUC_PREREQ(4,4) && defined(__ARM_EABI__)
|
|
#define mcount __gnu_mcount_nc
|
|
#else
|
|
#define mcount _mcount
|
|
#endif
|
|
|
|
#if defined(__ARM_EABI__)
|
|
/* Tag_ABI_align8_preserved: This code preserves 8-byte
|
|
alignment in any callee. */
|
|
.eabi_attribute 25, 1
|
|
/* Tag_ABI_align8_needed: This code may require 8-byte alignment from
|
|
the caller. */
|
|
.eabi_attribute 24, 1
|
|
#endif
|
|
|
|
#endif /* __ASSEMBLER__ */
|