1997-04-14 10:11:12 +08:00
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/* Assembler macros for ARM.
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2013-01-03 03:01:50 +08:00
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Copyright (C) 1997-2013 Free Software Foundation, Inc.
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1997-04-14 10:11:12 +08:00
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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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2001-07-06 12:56:23 +08:00
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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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1997-04-14 10:11:12 +08:00
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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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2001-07-06 12:56:23 +08:00
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Lesser General Public License for more details.
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1997-04-14 10:11:12 +08:00
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2001-07-06 12:56:23 +08:00
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You should have received a copy of the GNU Lesser General Public
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2012-03-10 07:56:38 +08:00
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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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1997-04-14 10:11:12 +08:00
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#include <sysdeps/generic/sysdep.h>
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2011-02-17 01:30:13 +08:00
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#include <features.h>
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1997-04-14 10:11:12 +08:00
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2004-12-05 05:20:17 +08:00
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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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1998-05-29 18:20:59 +08:00
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#ifdef __ASSEMBLER__
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1997-04-14 10:11:12 +08:00
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/* Syntactic details of assembler. */
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1998-05-20 00:11:52 +08:00
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#define ALIGNARG(log2) log2
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1997-04-14 10:11:12 +08:00
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#define ASM_SIZE_DIRECTIVE(name) .size name,.-name
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1998-03-18 22:29:30 +08:00
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#define PLTJMP(_x) _x##(PLT)
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1997-11-18 10:39:35 +08:00
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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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1997-04-14 10:11:12 +08:00
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#define LOADREGS(cond, base, reglist...)\
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ldm##cond base,reglist
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2004-12-05 05:20:17 +08:00
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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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2003-09-18 02:09:36 +08:00
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#define DO_RET(_reg) \
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bx _reg
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#else
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2004-12-05 05:20:17 +08:00
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#define RETINSTR(cond, reg) \
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mov##cond pc, reg
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2003-09-18 02:09:36 +08:00
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#define DO_RET(_reg) \
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mov pc, _reg
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#endif
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1997-11-18 10:39:35 +08:00
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#else /* APCS-26 */
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1997-04-14 10:11:12 +08:00
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#define LOADREGS(cond, base, reglist...)\
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ldm##cond base,reglist^
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2004-12-05 05:20:17 +08:00
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#define RETINSTR(cond, reg) \
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mov##cond##s pc, reg
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2003-09-18 02:09:36 +08:00
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#define DO_RET(_reg) \
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movs pc, _reg
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1997-04-14 10:11:12 +08:00
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#endif
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/* Define an entry point visible from C. */
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2013-02-28 15:04:17 +08:00
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#define ENTRY(name) \
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.globl C_SYMBOL_NAME(name); \
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.type 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; \
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cfi_startproc; \
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CALL_MCOUNT
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#define CFI_SECTIONS \
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.cfi_sections .debug_frame
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2013-02-28 08:36:47 +08:00
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1997-04-14 10:11:12 +08:00
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#undef END
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2013-02-28 15:04:17 +08:00
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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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1997-04-14 10:11:12 +08:00
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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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2012-04-22 01:03:39 +08:00
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/* Call __gnu_mcount_nc if GCC >= 4.4. */
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#if __GNUC_PREREQ(4,4)
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2013-02-28 15:04:17 +08:00
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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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2011-02-17 01:30:13 +08:00
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#else /* else call _mcount */
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2013-02-28 15:04:17 +08:00
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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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2011-02-17 01:30:13 +08:00
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#endif
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1997-04-14 10:11:12 +08:00
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#else
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#define CALL_MCOUNT /* Do nothing. */
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#endif
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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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2012-04-22 01:03:39 +08:00
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#if __GNUC_PREREQ(4,4)
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2011-02-17 01:30:13 +08:00
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#define mcount __gnu_mcount_nc
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#else
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1997-04-14 10:11:12 +08:00
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#define mcount _mcount
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#endif
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2009-10-23 03:39:47 +08:00
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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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2013-02-14 13:21:39 +08:00
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/* Load or store to/from a pc-relative EXPR into/from R, using T. */
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# ifdef __thumb2__
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# define LDST_PCREL(OP, R, T, EXPR) \
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ldr T, 98f; \
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.subsection 2; \
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98: .word EXPR - 99f - PC_OFS; \
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.previous; \
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99: add T, T, pc; \
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OP R, [T]
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# else
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# define LDST_PCREL(OP, R, T, EXPR) \
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ldr T, 98f; \
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.subsection 2; \
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98: .word EXPR - 99f - PC_OFS; \
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.previous; \
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99: OP R, [pc, T]
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# endif
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1998-05-29 18:20:59 +08:00
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#endif /* __ASSEMBLER__ */
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2013-02-13 09:15:52 +08:00
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/* This number is the offset from the pc at the current location. */
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/* ??? At the moment we're not turning on thumb mode in assembly. */
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#if defined(__thumb__) && !defined(__ASSEMBLER__)
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# define PC_OFS 4
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#else
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# define PC_OFS 8
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#endif
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