glibc/ports/sysdeps/arm/sysdep.h

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/* Assembler macros for ARM.
Copyright (C) 1997-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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
License as published by the Free Software Foundation; either
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,
but WITHOUT ANY WARRANTY; without even the implied warranty of
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
<http://www.gnu.org/licenses/>. */
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#include <sysdeps/generic/sysdep.h>
#include <features.h>
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#if (!defined (__ARM_ARCH_2__) && !defined (__ARM_ARCH_3__) \
&& !defined (__ARM_ARCH_3M__) && !defined (__ARM_ARCH_4__))
# define __USE_BX__
#endif
#ifdef __ASSEMBLER__
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/* Syntactic details of assembler. */
#define ALIGNARG(log2) log2
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#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__
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#define LOADREGS(cond, base, reglist...)\
ldm##cond base,reglist
#ifdef __USE_BX__
#define RETINSTR(cond, reg) \
bx##cond reg
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#define DO_RET(_reg) \
bx _reg
#else
#define RETINSTR(cond, reg) \
mov##cond pc, reg
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#define DO_RET(_reg) \
mov pc, _reg
#endif
#else /* APCS-26 */
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#define LOADREGS(cond, base, reglist...)\
ldm##cond base,reglist^
#define RETINSTR(cond, reg) \
mov##cond##s pc, reg
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#define DO_RET(_reg) \
movs pc, _reg
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#endif
/* Define an entry point visible from C. */
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#define ENTRY(name) \
.globl C_SYMBOL_NAME(name); \
.type C_SYMBOL_NAME(name),%function; \
.align ALIGNARG(4); \
C_LABEL(name) \
CFI_SECTIONS; \
cfi_startproc; \
CALL_MCOUNT
#define CFI_SECTIONS \
.cfi_sections .debug_frame
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#undef END
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#define END(name) \
cfi_endproc; \
ASM_SIZE_DIRECTIVE(name)
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/* If compiled for profiling, call `mcount' at the start of each function. */
#ifdef PROF
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/* Call __gnu_mcount_nc if GCC >= 4.4. */
#if __GNUC_PREREQ(4,4)
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#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 */
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#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
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#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
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#if __GNUC_PREREQ(4,4)
#define mcount __gnu_mcount_nc
#else
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#define mcount _mcount
#endif
/* 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
/* Load or store to/from a pc-relative EXPR into/from R, using T. */
# ifdef __thumb2__
# define LDST_PCREL(OP, R, T, EXPR) \
ldr T, 98f; \
.subsection 2; \
98: .word EXPR - 99f - PC_OFS; \
.previous; \
99: add T, T, pc; \
OP R, [T]
# else
# define LDST_PCREL(OP, R, T, EXPR) \
ldr T, 98f; \
.subsection 2; \
98: .word EXPR - 99f - PC_OFS; \
.previous; \
99: OP R, [pc, T]
# endif
#endif /* __ASSEMBLER__ */
/* This number is the offset from the pc at the current location. */
/* ??? At the moment we're not turning on thumb mode in assembly. */
#if defined(__thumb__) && !defined(__ASSEMBLER__)
# define PC_OFS 4
#else
# define PC_OFS 8
#endif