include/asm/kgdb.h

0001 /*
0002  * The PowerPC (32/64) specific defines / externs for KGDB.  Based on
0003  * the previous 32bit and 64bit specific files, which had the following
0004  * copyrights:
0005  *
0006  * PPC64 Mods (C) 2005 Frank Rowand (frowand@mvista.com)
0007  * PPC Mods (C) 2004 Tom Rini (trini@mvista.com)
0008  * PPC Mods (C) 2003 John Whitney (john.whitney@timesys.com)
0009  * PPC Mods (C) 1998 Michael Tesch (tesch@cs.wisc.edu)
0010  *
0011  *
0012  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
0013  * Author: Tom Rini <trini@kernel.crashing.org>
0014  *
0015  * 2006 (c) MontaVista Software, Inc. This file is licensed under
0016  * the terms of the GNU General Public License version 2. This program
0017  * is licensed "as is" without any warranty of any kind, whether express
0018  * or implied.
0019  */
0020 #ifdef __KERNEL__
0021 #ifndef __POWERPC_KGDB_H__
0022 #define __POWERPC_KGDB_H__
0023
0024 #ifndef __ASSEMBLY__
0025
0026 #define BREAK_INSTR_SIZE    4
0027 #define BUFMAX          ((NUMREGBYTES * 2) + 512)
0028 #define OUTBUFMAX       ((NUMREGBYTES * 2) + 512)
0029
0030 #define BREAK_INSTR     0x7d821008  /* twge r2, r2 */
0031
0032 static inline void arch_kgdb_breakpoint(void)
0033 {
0034     asm(stringify_in_c(.long BREAK_INSTR));
0035 }
0036 #define CACHE_FLUSH_IS_SAFE 1
0037 #define DBG_MAX_REG_NUM     70
0038
0039 /* The number bytes of registers we have to save depends on a few
0040  * things.  For 64bit we default to not including vector registers and
0041  * vector state registers. */
0042 #ifdef CONFIG_PPC64
0043 /*
0044  * 64 bit (8 byte) registers:
0045  *   32 gpr, 32 fpr, nip, msr, link, ctr
0046  * 32 bit (4 byte) registers:
0047  *   ccr, xer, fpscr
0048  */
0049 #define NUMREGBYTES     ((68 * 8) + (3 * 4))
0050 #define NUMCRITREGBYTES     184
0051 #else /* CONFIG_PPC32 */
0052 /* On non-E500 family PPC32 we determine the size by picking the last
0053  * register we need, but on E500 we skip sections so we list what we
0054  * need to store, and add it up. */
0055 #ifndef CONFIG_E500
0056 #define MAXREG          (PT_FPSCR+1)
0057 #else
0058 /* 32 GPRs (8 bytes), nip, msr, ccr, link, ctr, xer, acc (8 bytes), spefscr*/
0059 #define MAXREG                 ((32*2)+6+2+1)
0060 #endif
0061 #define NUMREGBYTES     (MAXREG * sizeof(int))
0062 /* CR/LR, R1, R2, R13-R31 inclusive. */
0063 #define NUMCRITREGBYTES     (23 * sizeof(int))
0064 #endif /* 32/64 */
0065 #endif /* !(__ASSEMBLY__) */
0066 #endif /* !__POWERPC_KGDB_H__ */
0067 #endif /* __KERNEL__ */