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0707ad30 CM |
1 | /* |
2 | * Copyright 2010 Tilera Corporation. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation, version 2. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
11 | * NON INFRINGEMENT. See the GNU General Public License for | |
12 | * more details. | |
13 | */ | |
14 | ||
15 | /** | |
16 | * @file | |
17 | * | |
18 | * ABI-related register definitions helpful when writing assembly code. | |
19 | */ | |
867e359b CM |
20 | |
21 | #ifndef __ARCH_ABI_H__ | |
22 | #define __ARCH_ABI_H__ | |
23 | ||
24 | #include <arch/chip.h> | |
25 | ||
0707ad30 | 26 | /* Registers 0 - 55 are "normal", but some perform special roles. */ |
867e359b CM |
27 | |
28 | #define TREG_FP 52 /**< Frame pointer. */ | |
29 | #define TREG_TP 53 /**< Thread pointer. */ | |
30 | #define TREG_SP 54 /**< Stack pointer. */ | |
31 | #define TREG_LR 55 /**< Link to calling function PC. */ | |
32 | ||
33 | /** Index of last normal general-purpose register. */ | |
34 | #define TREG_LAST_GPR 55 | |
35 | ||
0707ad30 | 36 | /* Registers 56 - 62 are "special" network registers. */ |
867e359b CM |
37 | |
38 | #define TREG_SN 56 /**< Static network access. */ | |
39 | #define TREG_IDN0 57 /**< IDN demux 0 access. */ | |
40 | #define TREG_IDN1 58 /**< IDN demux 1 access. */ | |
41 | #define TREG_UDN0 59 /**< UDN demux 0 access. */ | |
42 | #define TREG_UDN1 60 /**< UDN demux 1 access. */ | |
43 | #define TREG_UDN2 61 /**< UDN demux 2 access. */ | |
44 | #define TREG_UDN3 62 /**< UDN demux 3 access. */ | |
45 | ||
0707ad30 | 46 | /* Register 63 is the "special" zero register. */ |
867e359b CM |
47 | |
48 | #define TREG_ZERO 63 /**< "Zero" register; always reads as "0". */ | |
49 | ||
50 | ||
51 | /** By convention, this register is used to hold the syscall number. */ | |
52 | #define TREG_SYSCALL_NR 10 | |
53 | ||
54 | /** Name of register that holds the syscall number, for use in assembly. */ | |
55 | #define TREG_SYSCALL_NR_NAME r10 | |
56 | ||
57 | ||
0707ad30 CM |
58 | /** |
59 | * The ABI requires callers to allocate a caller state save area of | |
60 | * this many bytes at the bottom of each stack frame. | |
61 | */ | |
867e359b CM |
62 | #ifdef __tile__ |
63 | #define C_ABI_SAVE_AREA_SIZE (2 * __SIZEOF_POINTER__) | |
64 | #endif | |
65 | ||
0707ad30 CM |
66 | /** |
67 | * The operand to an 'info' opcode directing the backtracer to not | |
68 | * try to find the calling frame. | |
69 | */ | |
867e359b CM |
70 | #define INFO_OP_CANNOT_BACKTRACE 2 |
71 | ||
72 | #ifndef __ASSEMBLER__ | |
73 | #if CHIP_WORD_SIZE() > 32 | |
74 | ||
0707ad30 | 75 | /** Unsigned type that can hold a register. */ |
867e359b CM |
76 | typedef unsigned long long uint_reg_t; |
77 | ||
0707ad30 | 78 | /** Signed type that can hold a register. */ |
867e359b CM |
79 | typedef long long int_reg_t; |
80 | ||
0707ad30 | 81 | /** String prefix to use for printf(). */ |
867e359b CM |
82 | #define INT_REG_FMT "ll" |
83 | ||
84 | #elif !defined(__LP64__) /* avoid confusion with LP64 cross-build tools */ | |
85 | ||
0707ad30 | 86 | /** Unsigned type that can hold a register. */ |
867e359b CM |
87 | typedef unsigned long uint_reg_t; |
88 | ||
0707ad30 | 89 | /** Signed type that can hold a register. */ |
867e359b CM |
90 | typedef long int_reg_t; |
91 | ||
0707ad30 | 92 | /** String prefix to use for printf(). */ |
867e359b CM |
93 | #define INT_REG_FMT "l" |
94 | ||
95 | #endif | |
96 | #endif /* __ASSEMBLER__ */ | |
97 | ||
0707ad30 | 98 | #endif /* !__ARCH_ABI_H__ */ |