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Diffstat (limited to 'arch/tile/include/arch/abi.h')
-rw-r--r-- | arch/tile/include/arch/abi.h | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/arch/tile/include/arch/abi.h b/arch/tile/include/arch/abi.h new file mode 100644 index 000000000000..da8df5b9d914 --- /dev/null +++ b/arch/tile/include/arch/abi.h @@ -0,0 +1,98 @@ +/* + * Copyright 2010 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program 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, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +/** + * @file + * + * ABI-related register definitions helpful when writing assembly code. + */ + +#ifndef __ARCH_ABI_H__ +#define __ARCH_ABI_H__ + +#include <arch/chip.h> + +/* Registers 0 - 55 are "normal", but some perform special roles. */ + +#define TREG_FP 52 /**< Frame pointer. */ +#define TREG_TP 53 /**< Thread pointer. */ +#define TREG_SP 54 /**< Stack pointer. */ +#define TREG_LR 55 /**< Link to calling function PC. */ + +/** Index of last normal general-purpose register. */ +#define TREG_LAST_GPR 55 + +/* Registers 56 - 62 are "special" network registers. */ + +#define TREG_SN 56 /**< Static network access. */ +#define TREG_IDN0 57 /**< IDN demux 0 access. */ +#define TREG_IDN1 58 /**< IDN demux 1 access. */ +#define TREG_UDN0 59 /**< UDN demux 0 access. */ +#define TREG_UDN1 60 /**< UDN demux 1 access. */ +#define TREG_UDN2 61 /**< UDN demux 2 access. */ +#define TREG_UDN3 62 /**< UDN demux 3 access. */ + +/* Register 63 is the "special" zero register. */ + +#define TREG_ZERO 63 /**< "Zero" register; always reads as "0". */ + + +/** By convention, this register is used to hold the syscall number. */ +#define TREG_SYSCALL_NR 10 + +/** Name of register that holds the syscall number, for use in assembly. */ +#define TREG_SYSCALL_NR_NAME r10 + + +/** + * The ABI requires callers to allocate a caller state save area of + * this many bytes at the bottom of each stack frame. + */ +#ifdef __tile__ +#define C_ABI_SAVE_AREA_SIZE (2 * __SIZEOF_POINTER__) +#endif + +/** + * The operand to an 'info' opcode directing the backtracer to not + * try to find the calling frame. + */ +#define INFO_OP_CANNOT_BACKTRACE 2 + +#ifndef __ASSEMBLER__ +#if CHIP_WORD_SIZE() > 32 + +/** Unsigned type that can hold a register. */ +typedef unsigned long long uint_reg_t; + +/** Signed type that can hold a register. */ +typedef long long int_reg_t; + +/** String prefix to use for printf(). */ +#define INT_REG_FMT "ll" + +#elif !defined(__LP64__) /* avoid confusion with LP64 cross-build tools */ + +/** Unsigned type that can hold a register. */ +typedef unsigned long uint_reg_t; + +/** Signed type that can hold a register. */ +typedef long int_reg_t; + +/** String prefix to use for printf(). */ +#define INT_REG_FMT "l" + +#endif +#endif /* __ASSEMBLER__ */ + +#endif /* !__ARCH_ABI_H__ */ |