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8157107b CM |
1 | /* |
2 | * Copyright 2013 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 | * TILE-Gx KGDB support. | |
15 | */ | |
16 | ||
17 | #ifndef __TILE_KGDB_H__ | |
18 | #define __TILE_KGDB_H__ | |
19 | ||
20 | #include <linux/kdebug.h> | |
21 | #include <arch/opcode.h> | |
22 | ||
23 | #define GDB_SIZEOF_REG sizeof(unsigned long) | |
24 | ||
25 | /* | |
26 | * TILE-Gx gdb is expecting the following register layout: | |
27 | * 56 GPRs(R0 - R52, TP, SP, LR), 8 special GPRs(networks and ZERO), | |
28 | * plus the PC and the faultnum. | |
29 | * | |
30 | * Even though kernel not use the 8 special GPRs, they need to be present | |
31 | * in the registers sent for correct processing in the host-side gdb. | |
32 | * | |
33 | */ | |
34 | #define DBG_MAX_REG_NUM (56+8+2) | |
35 | #define NUMREGBYTES (DBG_MAX_REG_NUM * GDB_SIZEOF_REG) | |
36 | ||
37 | /* | |
38 | * BUFMAX defines the maximum number of characters in inbound/outbound | |
39 | * buffers at least NUMREGBYTES*2 are needed for register packets, | |
40 | * Longer buffer is needed to list all threads. | |
41 | */ | |
42 | #define BUFMAX 2048 | |
43 | ||
44 | #define BREAK_INSTR_SIZE TILEGX_BUNDLE_SIZE_IN_BYTES | |
45 | ||
46 | /* | |
47 | * Require cache flush for set/clear a software breakpoint or write memory. | |
48 | */ | |
49 | #define CACHE_FLUSH_IS_SAFE 1 | |
50 | ||
51 | /* | |
52 | * The compiled-in breakpoint instruction can be used to "break" into | |
53 | * the debugger via magic system request key (sysrq-G). | |
54 | */ | |
55 | static tile_bundle_bits compiled_bpt = TILEGX_BPT_BUNDLE | DIE_COMPILED_BPT; | |
56 | ||
57 | enum tilegx_regnum { | |
58 | TILEGX_PC_REGNUM = TREG_LAST_GPR + 9, | |
59 | TILEGX_FAULTNUM_REGNUM, | |
60 | }; | |
61 | ||
62 | /* | |
63 | * Generate a breakpoint exception to "break" into the debugger. | |
64 | */ | |
65 | static inline void arch_kgdb_breakpoint(void) | |
66 | { | |
67 | asm volatile (".quad %0\n\t" | |
68 | ::""(compiled_bpt)); | |
69 | } | |
70 | ||
71 | #endif /* __TILE_KGDB_H__ */ |