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authorLinus Torvalds <torvalds@linux-foundation.org>2008-07-23 22:59:37 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-23 22:59:37 +0400
commit0f6e38a6381446eff5175b77d1094834a633a90f (patch)
treee5295c372b6a73fa84b4d14b86ea9fa626d3f030 /include
parente669e8179d364bb11ed51504e1a1c60830bff4c5 (diff)
parent3b216c9ed347924efb5e7a66b3257c40a5596d30 (diff)
downloadlinux-0f6e38a6381446eff5175b77d1094834a633a90f.tar.xz
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb: kgdb: kgdboc console poll hooks for mpsc uart kgdb: kgdboc console poll hooks for cpm uart kgdb, powerpc: arch specific powerpc kgdb support kgdb: support for ARCH=arm kgdb: remove unused HAVE_ARCH_KGDB_SHADOW_INFO config variable
Diffstat (limited to 'include')
-rw-r--r--include/asm-arm/kgdb.h104
-rw-r--r--include/asm-arm/traps.h2
-rw-r--r--include/asm-powerpc/kgdb.h92
3 files changed, 156 insertions, 42 deletions
diff --git a/include/asm-arm/kgdb.h b/include/asm-arm/kgdb.h
new file mode 100644
index 000000000000..67af4b841984
--- /dev/null
+++ b/include/asm-arm/kgdb.h
@@ -0,0 +1,104 @@
+/*
+ * ARM KGDB support
+ *
+ * Author: Deepak Saxena <dsaxena@mvista.com>
+ *
+ * Copyright (C) 2002 MontaVista Software Inc.
+ *
+ */
+
+#ifndef __ARM_KGDB_H__
+#define __ARM_KGDB_H__
+
+#include <linux/ptrace.h>
+
+/*
+ * GDB assumes that we're a user process being debugged, so
+ * it will send us an SWI command to write into memory as the
+ * debug trap. When an SWI occurs, the next instruction addr is
+ * placed into R14_svc before jumping to the vector trap.
+ * This doesn't work for kernel debugging as we are already in SVC
+ * we would loose the kernel's LR, which is a bad thing. This
+ * is bad thing.
+ *
+ * By doing this as an undefined instruction trap, we force a mode
+ * switch from SVC to UND mode, allowing us to save full kernel state.
+ *
+ * We also define a KGDB_COMPILED_BREAK which can be used to compile
+ * in breakpoints. This is important for things like sysrq-G and for
+ * the initial breakpoint from trap_init().
+ *
+ * Note to ARM HW designers: Add real trap support like SH && PPC to
+ * make our lives much much simpler. :)
+ */
+#define BREAK_INSTR_SIZE 4
+#define GDB_BREAKINST 0xef9f0001
+#define KGDB_BREAKINST 0xe7ffdefe
+#define KGDB_COMPILED_BREAK 0xe7ffdeff
+#define CACHE_FLUSH_IS_SAFE 1
+
+#ifndef __ASSEMBLY__
+
+static inline void arch_kgdb_breakpoint(void)
+{
+ asm(".word 0xe7ffdeff");
+}
+
+extern void kgdb_handle_bus_error(void);
+extern int kgdb_fault_expected;
+
+#endif /* !__ASSEMBLY__ */
+
+/*
+ * From Kevin Hilman:
+ *
+ * gdb is expecting the following registers layout.
+ *
+ * r0-r15: 1 long word each
+ * f0-f7: unused, 3 long words each !!
+ * fps: unused, 1 long word
+ * cpsr: 1 long word
+ *
+ * Even though f0-f7 and fps are not used, they need to be
+ * present in the registers sent for correct processing in
+ * the host-side gdb.
+ *
+ * In particular, it is crucial that CPSR is in the right place,
+ * otherwise gdb will not be able to correctly interpret stepping over
+ * conditional branches.
+ */
+#define _GP_REGS 16
+#define _FP_REGS 8
+#define _EXTRA_REGS 2
+#define GDB_MAX_REGS (_GP_REGS + (_FP_REGS * 3) + _EXTRA_REGS)
+
+#define KGDB_MAX_NO_CPUS 1
+#define BUFMAX 400
+#define NUMREGBYTES (GDB_MAX_REGS << 2)
+#define NUMCRITREGBYTES (32 << 2)
+
+#define _R0 0
+#define _R1 1
+#define _R2 2
+#define _R3 3
+#define _R4 4
+#define _R5 5
+#define _R6 6
+#define _R7 7
+#define _R8 8
+#define _R9 9
+#define _R10 10
+#define _FP 11
+#define _IP 12
+#define _SPT 13
+#define _LR 14
+#define _PC 15
+#define _CPSR (GDB_MAX_REGS - 1)
+
+/*
+ * So that we can denote the end of a frame for tracing,
+ * in the simple case:
+ */
+#define CFI_END_FRAME(func) __CFI_END_FRAME(_PC, _SPT, func)
+
+#endif /* __ASM_KGDB_H__ */
diff --git a/include/asm-arm/traps.h b/include/asm-arm/traps.h
index f1541afcf85c..aa399aec568e 100644
--- a/include/asm-arm/traps.h
+++ b/include/asm-arm/traps.h
@@ -24,4 +24,6 @@ static inline int in_exception_text(unsigned long ptr)
ptr < (unsigned long)&__exception_text_end;
}
+extern void __init early_trap_init(void);
+
#endif
diff --git a/include/asm-powerpc/kgdb.h b/include/asm-powerpc/kgdb.h
index b617dac82969..1399caf719ae 100644
--- a/include/asm-powerpc/kgdb.h
+++ b/include/asm-powerpc/kgdb.h
@@ -1,57 +1,65 @@
/*
- * kgdb.h: Defines and declarations for serial line source level
- * remote debugging of the Linux kernel using gdb.
+ * include/asm-powerpc/kgdb.h
*
+ * The PowerPC (32/64) specific defines / externs for KGDB. Based on
+ * the previous 32bit and 64bit specific files, which had the following
+ * copyrights:
+ *
+ * PPC64 Mods (C) 2005 Frank Rowand (frowand@mvista.com)
+ * PPC Mods (C) 2004 Tom Rini (trini@mvista.com)
+ * PPC Mods (C) 2003 John Whitney (john.whitney@timesys.com)
* PPC Mods (C) 1998 Michael Tesch (tesch@cs.wisc.edu)
*
+ *
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Author: Tom Rini <trini@kernel.crashing.org>
+ *
+ * 2006 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
*/
#ifdef __KERNEL__
-#ifndef _PPC_KGDB_H
-#define _PPC_KGDB_H
+#ifndef __POWERPC_KGDB_H__
+#define __POWERPC_KGDB_H__
#ifndef __ASSEMBLY__
-/* Things specific to the gen550 backend. */
-struct uart_port;
-
-extern void gen550_progress(char *, unsigned short);
-extern void gen550_kgdb_map_scc(void);
-extern void gen550_init(int, struct uart_port *);
-
-/* Things specific to the pmac backend. */
-extern void zs_kgdb_hook(int tty_num);
-
-/* To init the kgdb engine. (called by serial hook)*/
-extern void set_debug_traps(void);
-
-/* To enter the debugger explicitly. */
-extern void breakpoint(void);
-
-/* For taking exceptions
- * these are defined in traps.c
- */
-extern int (*debugger)(struct pt_regs *regs);
-extern int (*debugger_bpt)(struct pt_regs *regs);
-extern int (*debugger_sstep)(struct pt_regs *regs);
-extern int (*debugger_iabr_match)(struct pt_regs *regs);
-extern int (*debugger_dabr_match)(struct pt_regs *regs);
-extern void (*debugger_fault_handler)(struct pt_regs *regs);
-
-/* What we bring to the party */
-int kgdb_bpt(struct pt_regs *regs);
-int kgdb_sstep(struct pt_regs *regs);
-void kgdb(struct pt_regs *regs);
-int kgdb_iabr_match(struct pt_regs *regs);
-int kgdb_dabr_match(struct pt_regs *regs);
+#define BREAK_INSTR_SIZE 4
+#define BUFMAX ((NUMREGBYTES * 2) + 512)
+#define OUTBUFMAX ((NUMREGBYTES * 2) + 512)
+static inline void arch_kgdb_breakpoint(void)
+{
+ asm(".long 0x7d821008"); /* twge r2, r2 */
+}
+#define CACHE_FLUSH_IS_SAFE 1
+/* The number bytes of registers we have to save depends on a few
+ * things. For 64bit we default to not including vector registers and
+ * vector state registers. */
+#ifdef CONFIG_PPC64
/*
- * external low-level support routines (ie macserial.c)
+ * 64 bit (8 byte) registers:
+ * 32 gpr, 32 fpr, nip, msr, link, ctr
+ * 32 bit (4 byte) registers:
+ * ccr, xer, fpscr
*/
-extern void kgdb_interruptible(int); /* control interrupts from serial */
-extern void putDebugChar(char); /* write a single character */
-extern char getDebugChar(void); /* read and return a single char */
-
+#define NUMREGBYTES ((68 * 8) + (3 * 4))
+#define NUMCRITREGBYTES 184
+#else /* CONFIG_PPC32 */
+/* On non-E500 family PPC32 we determine the size by picking the last
+ * register we need, but on E500 we skip sections so we list what we
+ * need to store, and add it up. */
+#ifndef CONFIG_E500
+#define MAXREG (PT_FPSCR+1)
+#else
+/* 32 GPRs (8 bytes), nip, msr, ccr, link, ctr, xer, acc (8 bytes), spefscr*/
+#define MAXREG ((32*2)+6+2+1)
+#endif
+#define NUMREGBYTES (MAXREG * sizeof(int))
+/* CR/LR, R1, R2, R13-R31 inclusive. */
+#define NUMCRITREGBYTES (23 * sizeof(int))
+#endif /* 32/64 */
#endif /* !(__ASSEMBLY__) */
-#endif /* !(_PPC_KGDB_H) */
+#endif /* !__POWERPC_KGDB_H__ */
#endif /* __KERNEL__ */