[PATCH] FRV: Introduce asm-offsets for FRV arch

Introduce the use of asm-offsets into the FRV architecture.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 65 insertions, 90 deletions

diff --git a/include/asm-frv/gdb-stub.h b/include/asm-frv/gdb-stub.h
index c58479a4be99..24f9738670bd 100644
--- a/include/asm-frv/gdb-stub.h
+++ b/include/asm-frv/gdb-stub.h
@@ -89,6 +89,7 @@ extern void gdbstub_do_rx(void);
 
 extern asmlinkage void __debug_stub_init_break(void);
 extern asmlinkage void __break_hijack_kernel_event(void);
+extern asmlinkage void __break_hijack_kernel_event_breaks_here(void);
 extern asmlinkage void start_kernel(void);
 
 extern asmlinkage void gdbstub_rx_handler(void);
@@ -114,5 +115,26 @@ extern void console_set_baud(unsigned baud);
 #define gdbstub_proto(FMT,...) ({ 0; })
 #endif
 
+/*
+ * we dedicate GR31 to keeping a pointer to the gdbstub exception frame
+ * - gr31 is destroyed on entry to the gdbstub if !MMU
+ * - gr31 is saved in scr3 on entry to the gdbstub if in !MMU
+ */
+register struct frv_frame0 *__debug_frame0 asm("gr31");
+
+#define __debug_frame		(&__debug_frame0->regs)
+#define __debug_user_context	(&__debug_frame0->uc)
+#define __debug_regs		(&__debug_frame0->debug)
+#define __debug_reg(X)		((unsigned long *) ((unsigned long) &__debug_frame0 + (X)))
+
+struct frv_debug_status {
+	unsigned long		bpsr;
+	unsigned long		dcr;
+	unsigned long		brr;
+	unsigned long		nmar;
+};
+
+extern struct frv_debug_status __debug_status;
+
 #endif /* _LANGUAGE_ASSEMBLY */
 #endif /* __ASM_GDB_STUB_H */
diff --git a/include/asm-frv/ptrace.h b/include/asm-frv/ptrace.h
index b2cce0718e57..7ff525162a72 100644
--- a/include/asm-frv/ptrace.h
+++ b/include/asm-frv/ptrace.h
@@ -62,18 +62,10 @@
 #ifndef __ASSEMBLY__
 
 /*
- * dedicate GR28; to keeping the a pointer to the current exception frame
+ * we dedicate GR28 to keeping a pointer to the current exception frame
+ * - gr28 is destroyed on entry to the kernel from userspace
  */
 register struct pt_regs *__frame asm("gr28");
-register struct pt_regs *__debug_frame asm("gr31");
-
-#ifndef container_of
-#define container_of(ptr, type, member) ({			\
-        const typeof( ((type *)0)->member ) *__mptr = (ptr);	\
-        (type *)( (char *)__mptr - offsetof(type,member) );})
-#endif
-
-#define __debug_regs container_of(__debug_frame, struct pt_debug_regs, normal_regs)
 
 #define user_mode(regs)			(!((regs)->psr & PSR_S))
 #define instruction_pointer(regs)	((regs)->pc)
diff --git a/include/asm-frv/registers.h b/include/asm-frv/registers.h
index fccfd95cff68..9666119fcf6e 100644
--- a/include/asm-frv/registers.h
+++ b/include/asm-frv/registers.h
@@ -23,7 +23,13 @@
  *
  *	+0x2000	+----------------------
  *		| union {
- *		|	struct user_context
+ *		|	struct frv_frame0 {
+ *		|		struct user_context {
+ *		|			struct user_int_regs
+ *		|			struct user_fpmedia_regs
+ *		|		}
+ *		|		struct frv_debug_regs
+ *		|	}
  *		|	struct pt_regs [user exception]
  *		| }
  *		+---------------------- <-- __kernel_frame0_ptr (maybe GR28)
@@ -51,11 +57,11 @@
 #define _ASM_REGISTERS_H
 
 #ifndef __ASSEMBLY__
-#define __OFFSET(X)	(X)
+#define __OFFSET(X,N)	((X)+(N)*4)
 #define __OFFSETC(X,N)	xxxxxxxxxxxxxxxxxxxxxxxx
 #else
-#define __OFFSET(X)	((X)*4)
-#define __OFFSETC(X,N)	((X)*4+(N))
+#define __OFFSET(X,N)	((X)+(N)*4)
+#define __OFFSETC(X,N)	((X)+(N))
 #endif
 
 /*****************************************************************************/
@@ -117,30 +123,13 @@ struct pt_regs {
 
 #endif
 
-#define REG_PSR		__OFFSET( 0)	/* Processor Status Register */
-#define REG_ISR		__OFFSET( 1)	/* Integer Status Register */
-#define REG_CCR		__OFFSET( 2)	/* Condition Code Register */
-#define REG_CCCR	__OFFSET( 3)	/* Condition Code for Conditional Insns Register */
-#define REG_LR		__OFFSET( 4)	/* Link Register */
-#define REG_LCR		__OFFSET( 5)	/* Loop Count Register */
-#define REG_PC		__OFFSET( 6)	/* Program Counter */
-
-#define REG__STATUS	__OFFSET( 7)	/* exception status */
 #define REG__STATUS_STEP	0x00000001	/* - reenable single stepping on return */
 #define REG__STATUS_STEPPED	0x00000002	/* - single step caused exception */
 #define REG__STATUS_BROKE	0x00000004	/* - BREAK insn caused exception */
 #define REG__STATUS_SYSC_ENTRY	0x40000000	/* - T on syscall entry (ptrace.c only) */
 #define REG__STATUS_SYSC_EXIT	0x80000000	/* - T on syscall exit (ptrace.c only) */
 
-#define REG_SYSCALLNO	__OFFSET( 8)	/* syscall number or -1 */
-#define REG_ORIG_GR8	__OFFSET( 9)	/* saved GR8 for signal handling */
-#define REG_GNER0	__OFFSET(10)
-#define REG_GNER1	__OFFSET(11)
-#define REG_IACC0	__OFFSET(12)
-
-#define REG_TBR		__OFFSET(14)	/* Trap Vector Register */
-#define REG_GR(R)	__OFFSET((14+(R)))
-#define REG__END	REG_GR(32)
+#define REG_GR(R)	__OFFSET(REG_GR0, (R))
 
 #define REG_SP		REG_GR(1)
 #define REG_FP		REG_GR(2)
@@ -149,27 +138,21 @@ struct pt_regs {
 
 /*****************************************************************************/
 /*
- * extension tacked in front of the exception frame in debug mode
+ * debugging registers
  */
 #ifndef __ASSEMBLY__
 
-struct pt_debug_regs
+struct frv_debug_regs
 {
-	unsigned long		bpsr;
 	unsigned long		dcr;
-	unsigned long		brr;
-	unsigned long		nmar;
-	struct pt_regs		normal_regs;
+	unsigned long		ibar[4] __attribute__((aligned(8)));
+	unsigned long		dbar[4] __attribute__((aligned(8)));
+	unsigned long		dbdr[4][4] __attribute__((aligned(8)));
+	unsigned long		dbmr[4][4] __attribute__((aligned(8)));
 } __attribute__((aligned(8)));
 
 #endif
 
-#define REG_NMAR		__OFFSET(-1)
-#define REG_BRR			__OFFSET(-2)
-#define REG_DCR			__OFFSET(-3)
-#define REG_BPSR		__OFFSET(-4)
-#define REG__DEBUG_XTRA		__OFFSET(4)
-
 /*****************************************************************************/
 /*
  * userspace registers
@@ -223,33 +206,27 @@ struct user_context
 	void *extension;
 } __attribute__((aligned(8)));
 
+struct frv_frame0 {
+	union {
+		struct pt_regs		regs;
+		struct user_context	uc;
+	};
+
+	struct frv_debug_regs		debug;
+
+} __attribute__((aligned(32)));
+
 #endif
 
-#define NR_USER_INT_REGS	(14 + 64)
-#define NR_USER_FPMEDIA_REGS	(64 + 2 + 2 + 8 + 8/4 + 1)
-#define NR_USER_CONTEXT		(NR_USER_INT_REGS + NR_USER_FPMEDIA_REGS + 1)
-
-#define USER_CONTEXT_SIZE	(((NR_USER_CONTEXT + 1) & ~1) * 4)
-
-#define __THREAD_FRAME		__OFFSET(0)
-#define __THREAD_CURR		__OFFSET(1)
-#define __THREAD_SP		__OFFSET(2)
-#define __THREAD_FP		__OFFSET(3)
-#define __THREAD_LR		__OFFSET(4)
-#define __THREAD_PC		__OFFSET(5)
-#define __THREAD_GR(R)		__OFFSET(6 + (R) - 16)
-#define __THREAD_FRAME0		__OFFSET(19)
-#define __THREAD_USER		__OFFSET(19)
-
-#define __USER_INT		__OFFSET(0)
-#define __INT_GR(R)		__OFFSET(14 + (R))
-
-#define __USER_FPMEDIA		__OFFSET(NR_USER_INT_REGS)
-#define __FPMEDIA_FR(R)		__OFFSET(NR_USER_INT_REGS + (R))
-#define __FPMEDIA_FNER(R)	__OFFSET(NR_USER_INT_REGS + 64 + (R))
-#define __FPMEDIA_MSR(R)	__OFFSET(NR_USER_INT_REGS + 66 + (R))
-#define __FPMEDIA_ACC(R)	__OFFSET(NR_USER_INT_REGS + 68 + (R))
-#define __FPMEDIA_ACCG(R)	__OFFSETC(NR_USER_INT_REGS + 76, (R))
-#define __FPMEDIA_FSR(R)	__OFFSET(NR_USER_INT_REGS + 78 + (R))
+#define __INT_GR(R)		__OFFSET(__INT_GR0,		(R))
+
+#define __FPMEDIA_FR(R)		__OFFSET(__FPMEDIA_FR0,		(R))
+#define __FPMEDIA_FNER(R)	__OFFSET(__FPMEDIA_FNER0,	(R))
+#define __FPMEDIA_MSR(R)	__OFFSET(__FPMEDIA_MSR0,	(R))
+#define __FPMEDIA_ACC(R)	__OFFSET(__FPMEDIA_ACC0,	(R))
+#define __FPMEDIA_ACCG(R)	__OFFSETC(__FPMEDIA_ACCG0,	(R))
+#define __FPMEDIA_FSR(R)	__OFFSET(__FPMEDIA_FSR0,	(R))
+
+#define __THREAD_GR(R)		__OFFSET(__THREAD_GR16,		(R) - 16)
 
 #endif /* _ASM_REGISTERS_H */
diff --git a/include/asm-frv/thread_info.h b/include/asm-frv/thread_info.h
index ea426abf01d3..d66c48e6ef14 100644
--- a/include/asm-frv/thread_info.h
+++ b/include/asm-frv/thread_info.h
@@ -19,6 +19,8 @@
 #include <asm/processor.h>
 #endif
 
+#define THREAD_SIZE		8192
+
 /*
  * low level task data that entry.S needs immediate access to
  * - this struct should fit entirely inside of one cache line
@@ -46,15 +48,7 @@ struct thread_info {
 
 #else /* !__ASSEMBLY__ */
 
-/* offsets into the thread_info struct for assembly code access */
-#define TI_TASK			0x00000000
-#define TI_EXEC_DOMAIN		0x00000004
-#define TI_FLAGS		0x00000008
-#define TI_STATUS		0x0000000C
-#define TI_CPU			0x00000010
-#define TI_PRE_COUNT		0x00000014
-#define TI_ADDR_LIMIT		0x00000018
-#define TI_RESTART_BLOCK	0x0000001C
+#include <asm/asm-offsets.h>
 
 #endif
 
@@ -83,12 +77,6 @@ struct thread_info {
 #define init_thread_info	(init_thread_union.thread_info)
 #define init_stack		(init_thread_union.stack)
 
-#ifdef CONFIG_SMALL_TASKS
-#define THREAD_SIZE		4096
-#else
-#define THREAD_SIZE		8192
-#endif
-
 /* how to get the thread information struct from C */
 register struct thread_info *__current_thread_info asm("gr15");
 
@@ -111,11 +99,7 @@ register struct thread_info *__current_thread_info asm("gr15");
 
 #define free_thread_info(info)	kfree(info)
 
-#else /* !__ASSEMBLY__ */
-
-#define THREAD_SIZE	8192
-
-#endif
+#endif /* __ASSEMBLY__ */
 
 /*
  * thread information flags