diff options
Diffstat (limited to 'ports/sysdeps/arm/sysdep.h')
| -rw-r--r-- | ports/sysdeps/arm/sysdep.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/ports/sysdeps/arm/sysdep.h b/ports/sysdeps/arm/sysdep.h new file mode 100644 index 0000000000..7800456f64 --- /dev/null +++ b/ports/sysdeps/arm/sysdep.h @@ -0,0 +1,120 @@ +/* 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, see + <http://www.gnu.org/licenses/>. */ + +#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. */ +#if __GNUC_PREREQ(4,4) +#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) +#define mcount __gnu_mcount_nc +#else +#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 + +#endif /* __ASSEMBLER__ */ |