| /* Assembler macros for ARM. |
| Copyright (C) 1997, 1998, 2003 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> |
| |
| #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. */ |
| |
| #ifdef HAVE_ELF |
| |
| #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 |
| |
| /* In ELF C symbols are asm symbols. */ |
| #undef NO_UNDERSCORES |
| #define NO_UNDERSCORES |
| |
| #define PLTJMP(_x) _x##(PLT) |
| |
| #else |
| |
| #define ALIGNARG(log2) log2 |
| #define ASM_TYPE_DIRECTIVE(name,type) /* Nothing is specified. */ |
| #define ASM_SIZE_DIRECTIVE(name) /* Nothing is specified. */ |
| |
| #define PLTJMP(_x) _x |
| |
| #endif |
| |
| /* 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) \ |
| CALL_MCOUNT |
| |
| #undef END |
| #define END(name) \ |
| ASM_SIZE_DIRECTIVE(name) |
| |
| /* If compiled for profiling, call `mcount' at the start of each function. */ |
| #ifdef PROF |
| #define CALL_MCOUNT \ |
| str lr,[sp, #-4]! ; \ |
| bl PLTJMP(mcount) ; \ |
| ldr lr, [sp], #4 ; |
| #else |
| #define CALL_MCOUNT /* Do nothing. */ |
| #endif |
| |
| #ifdef NO_UNDERSCORES |
| /* 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 |
| #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__ */ |