| Chris Metcalf | 8157107 | 2013-08-28 19:53:17 -0400 | [diff] [blame] | 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__ */ |