[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>

9 files changed, 248 insertions, 107 deletions

diff --git a/arch/frv/kernel/asm-offsets.c b/arch/frv/kernel/asm-offsets.c
index 9e26311..fbb19fc 100644
--- a/arch/frv/kernel/asm-offsets.c
+++ b/arch/frv/kernel/asm-offsets.c
@@ -1 +1,115 @@
-/* Dummy asm-offsets.c file. Required by kbuild and ready to be used - hint! */
+/*
+ * Generate definitions needed by assembly language modules.
+ * This code generates raw asm output which is post-processed
+ * to extract and format the required data.
+ */
+
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/personality.h>
+#include <asm/registers.h>
+#include <asm/ucontext.h>
+#include <asm/processor.h>
+#include <asm/thread_info.h>
+#include <asm/gdb-stub.h>
+
+#define DEFINE(sym, val) \
+        asm volatile("\n->" #sym " %0 " #val : : "i" (val))
+
+#define DEF_PTREG(sym, reg) \
+        asm volatile("\n->" #sym " %0 offsetof(struct pt_regs, " #reg ")" \
+		     : : "i" (offsetof(struct pt_regs, reg)))
+
+#define DEF_IREG(sym, reg) \
+        asm volatile("\n->" #sym " %0 offsetof(struct user_context, " #reg ")" \
+		     : : "i" (offsetof(struct user_context, reg)))
+
+#define DEF_FREG(sym, reg) \
+        asm volatile("\n->" #sym " %0 offsetof(struct user_context, " #reg ")" \
+		     : : "i" (offsetof(struct user_context, reg)))
+
+#define DEF_0REG(sym, reg) \
+        asm volatile("\n->" #sym " %0 offsetof(struct frv_frame0, " #reg ")" \
+		     : : "i" (offsetof(struct frv_frame0, reg)))
+
+#define BLANK() asm volatile("\n->" : : )
+
+#define OFFSET(sym, str, mem) \
+	DEFINE(sym, offsetof(struct str, mem));
+
+void foo(void)
+{
+	/* offsets into the thread_info structure */
+	OFFSET(TI_TASK,			thread_info, task);
+	OFFSET(TI_EXEC_DOMAIN,		thread_info, exec_domain);
+	OFFSET(TI_FLAGS,		thread_info, flags);
+	OFFSET(TI_STATUS,		thread_info, status);
+	OFFSET(TI_CPU,			thread_info, cpu);
+	OFFSET(TI_PREEMPT_COUNT,	thread_info, preempt_count);
+	OFFSET(TI_ADDR_LIMIT,		thread_info, addr_limit);
+	OFFSET(TI_RESTART_BLOCK,	thread_info, restart_block);
+	BLANK();
+
+	/* offsets into register file storage */
+	DEF_PTREG(REG_PSR,		psr);
+	DEF_PTREG(REG_ISR,		isr);
+	DEF_PTREG(REG_CCR,		ccr);
+	DEF_PTREG(REG_CCCR,		cccr);
+	DEF_PTREG(REG_LR,		lr);
+	DEF_PTREG(REG_LCR,		lcr);
+	DEF_PTREG(REG_PC,		pc);
+	DEF_PTREG(REG__STATUS,		__status);
+	DEF_PTREG(REG_SYSCALLNO,	syscallno);
+	DEF_PTREG(REG_ORIG_GR8,		orig_gr8);
+	DEF_PTREG(REG_GNER0,		gner0);
+	DEF_PTREG(REG_GNER1,		gner1);
+	DEF_PTREG(REG_IACC0,		iacc0);
+	DEF_PTREG(REG_TBR,		tbr);
+	DEF_PTREG(REG_GR0,		tbr);
+	DEFINE(REG__END,		sizeof(struct pt_regs));
+	BLANK();
+
+	DEF_0REG(REG_DCR,		debug.dcr);
+	DEF_0REG(REG_IBAR0,		debug.ibar[0]);
+	DEF_0REG(REG_DBAR0,		debug.dbar[0]);
+	DEF_0REG(REG_DBDR00,		debug.dbdr[0][0]);
+	DEF_0REG(REG_DBMR00,		debug.dbmr[0][0]);
+	BLANK();
+
+	DEF_IREG(__INT_GR0,		i.gr[0]);
+	DEF_FREG(__USER_FPMEDIA,	f);
+	DEF_FREG(__FPMEDIA_FR0,		f.fr[0]);
+	DEF_FREG(__FPMEDIA_FNER0,	f.fner[0]);
+	DEF_FREG(__FPMEDIA_MSR0,	f.msr[0]);
+	DEF_FREG(__FPMEDIA_ACC0,	f.acc[0]);
+	DEF_FREG(__FPMEDIA_ACCG0,	f.accg[0]);
+	DEF_FREG(__FPMEDIA_FSR0,	f.fsr[0]);
+	BLANK();
+
+	DEFINE(NR_PT_REGS,		sizeof(struct pt_regs) / 4);
+	DEFINE(NR_USER_INT_REGS,	sizeof(struct user_int_regs) / 4);
+	DEFINE(NR_USER_FPMEDIA_REGS,	sizeof(struct user_fpmedia_regs) / 4);
+	DEFINE(NR_USER_CONTEXT,		sizeof(struct user_context) / 4);
+	DEFINE(FRV_FRAME0_SIZE,		sizeof(struct frv_frame0));
+	BLANK();
+
+	/* offsets into thread_struct */
+	OFFSET(__THREAD_FRAME,		thread_struct, frame);
+	OFFSET(__THREAD_CURR,		thread_struct, curr);
+	OFFSET(__THREAD_SP,		thread_struct, sp);
+	OFFSET(__THREAD_FP,		thread_struct, fp);
+	OFFSET(__THREAD_LR,		thread_struct, lr);
+	OFFSET(__THREAD_PC,		thread_struct, pc);
+	OFFSET(__THREAD_GR16,		thread_struct, gr[0]);
+	OFFSET(__THREAD_SCHED_LR,	thread_struct, sched_lr);
+	OFFSET(__THREAD_FRAME0,		thread_struct, frame0);
+	OFFSET(__THREAD_USER,		thread_struct, user);
+	BLANK();
+
+	/* offsets into frv_debug_status */
+	OFFSET(DEBUG_BPSR,		frv_debug_status, bpsr);
+	OFFSET(DEBUG_DCR,		frv_debug_status, dcr);
+	OFFSET(DEBUG_BRR,		frv_debug_status, brr);
+	OFFSET(DEBUG_NMAR,		frv_debug_status, nmar);
+	BLANK();
+}
diff --git a/arch/frv/kernel/break.S b/arch/frv/kernel/break.S
index ea161f0..dac4a5f 100644
--- a/arch/frv/kernel/break.S
+++ b/arch/frv/kernel/break.S
@@ -9,11 +9,11 @@
  * 2 of the License, or (at your option) any later version.
  */
 
-#include <linux/sys.h>
 #include <linux/linkage.h>
 #include <asm/setup.h>
 #include <asm/segment.h>
 #include <asm/ptrace.h>
+#include <asm/thread_info.h>
 #include <asm/spr-regs.h>
 
 #include <asm/errno.h>
@@ -23,13 +23,11 @@
 #
 	.section	.bss.stack
 	.globl		__break_user_context
-	.balign		8192
+	.balign		THREAD_SIZE
 __break_stack:
-	.space		(8192 - (USER_CONTEXT_SIZE + REG__DEBUG_XTRA)) & ~7
-__break_stack_tos:
-	.space		REG__DEBUG_XTRA
-__break_user_context:
-	.space		USER_CONTEXT_SIZE
+	.space		THREAD_SIZE - FRV_FRAME0_SIZE
+__break_frame_0:
+	.space		FRV_FRAME0_SIZE
 
 #
 # miscellaneous variables
@@ -74,8 +72,8 @@ __entry_break:
 #endif
 	LEDS		0x1001,gr31
 
-	sethi.p		%hi(__break_user_context),gr31
-	setlo		%lo(__break_user_context),gr31
+	sethi.p		%hi(__break_frame_0),gr31
+	setlo		%lo(__break_frame_0),gr31
 
 	stdi		gr2,@(gr31,#REG_GR(2))
 	movsg		ccr,gr3
@@ -585,8 +583,8 @@ __break_continue:
 	# set up the kernel stack pointer
 	sti		sp,@(gr31,#REG_SP)
 
-	sethi.p		%hi(__break_stack_tos),sp
-	setlo		%lo(__break_stack_tos),sp
+	sethi.p		%hi(__break_frame_0),sp
+	setlo		%lo(__break_frame_0),sp
 
 	# finish building the exception frame
 	stdi		gr4 ,@(gr31,#REG_GR(4))
@@ -651,9 +649,12 @@ __break_continue:
 	movsg		nmar,gr5
 	movsg		dcr,gr6
 
-	stdi		gr4 ,@(gr31,#REG_BRR)
-	sti		gr19,@(gr31,#REG_BPSR)
-	sti.p		gr6 ,@(gr31,#REG_DCR)
+	sethi.p		%hi(__debug_status),gr7
+	setlo		%lo(__debug_status),gr7
+
+	stdi		gr4 ,@(gr7,#DEBUG_BRR)
+	sti		gr19,@(gr7,#DEBUG_BPSR)
+	sti.p		gr6 ,@(gr7,#DEBUG_DCR)
 
 	# trap exceptions during break handling and disable h/w breakpoints/watchpoints
 	sethi		%hi(DCR_EBE),gr5
@@ -698,7 +699,10 @@ __break_continue:
 	lddi		@(gr31,#REG_PSR) ,gr22
 	ldi		@(gr31,#REG_PC)  ,gr21
 	ldi		@(gr31,#REG_TBR) ,gr20
-	ldi.p		@(gr31,#REG_DCR) ,gr6
+
+	sethi.p		%hi(__debug_status),gr6
+	setlo		%lo(__debug_status),gr6
+	ldi.p		@(gr6,#DEBUG_DCR) ,gr6
 
 	andi		gr22,#PSR_S,gr19		/* rebuild BPSR */
 	andi.p		gr22,#PSR_ET,gr5
diff --git a/arch/frv/kernel/debug-stub.c b/arch/frv/kernel/debug-stub.c
index 4761cc4..2f6c60c 100644
--- a/arch/frv/kernel/debug-stub.c
+++ b/arch/frv/kernel/debug-stub.c
@@ -39,10 +39,9 @@ do {						\
 	gdbstub_do_rx();			\
 } while(!FLOWCTL_QUERY(LINE))
 
-static void __init debug_stub_init(void);
+struct frv_debug_status __debug_status;
 
-extern asmlinkage void __break_hijack_kernel_event(void);
-extern asmlinkage void __break_hijack_kernel_event_breaks_here(void);
+static void __init debug_stub_init(void);
 
 /*****************************************************************************/
 /*
@@ -67,7 +66,7 @@ asmlinkage void debug_stub(void)
 		__set_HSR(0, hsr0 & ~HSR0_ETMD);
 
 	/* disable single stepping */
-	__debug_regs->dcr &= ~DCR_SE;
+	__debug_status.dcr &= ~DCR_SE;
 
 	/* kernel mode can propose an exception be handled in debug mode by jumping to a special
 	 * location */
@@ -76,8 +75,8 @@ asmlinkage void debug_stub(void)
 		 * the top kernel context */
 		*__debug_frame = *__frame;
 		__frame = __debug_frame->next_frame;
-		__debug_regs->brr = (__debug_frame->tbr & TBR_TT) << 12;
-		__debug_regs->brr |= BRR_EB;
+		__debug_status.brr = (__debug_frame->tbr & TBR_TT) << 12;
+		__debug_status.brr |= BRR_EB;
 	}
 
 	if (__debug_frame->pc == (unsigned long) __debug_bug_trap + 4) {
@@ -124,7 +123,7 @@ static void __init debug_stub_init(void)
 		__debug_frame->pc = (unsigned long) start_kernel;
 
 	/* enable the debug events we want to trap */
-	__debug_regs->dcr = DCR_EBE;
+	__debug_status.dcr = DCR_EBE;
 
 #ifdef CONFIG_GDBSTUB
 	gdbstub_init();
diff --git a/arch/frv/kernel/entry.S b/arch/frv/kernel/entry.S
index 2a1ff1f..940ac30 100644
--- a/arch/frv/kernel/entry.S
+++ b/arch/frv/kernel/entry.S
@@ -27,7 +27,6 @@
  *
  */
 
-#include <linux/sys.h>
 #include <linux/linkage.h>
 #include <asm/thread_info.h>
 #include <asm/setup.h>
diff --git a/arch/frv/kernel/gdb-stub.c b/arch/frv/kernel/gdb-stub.c
index 508601f..9550f37 100644
--- a/arch/frv/kernel/gdb-stub.c
+++ b/arch/frv/kernel/gdb-stub.c
@@ -124,6 +124,7 @@
 #include <linux/slab.h>
 #include <linux/nmi.h>
 
+#include <asm/asm-offsets.h>
 #include <asm/pgtable.h>
 #include <asm/system.h>
 #include <asm/gdb-stub.h>
@@ -136,7 +137,6 @@ extern void debug_to_serial(const char *p, int n);
 extern void gdbstub_console_write(struct console *co, const char *p, unsigned n);
 
 extern volatile uint32_t __break_error_detect[3]; /* ESFR1, ESR15, EAR15 */
-extern struct user_context __break_user_context;
 
 struct __debug_amr {
 	unsigned long L, P;
@@ -926,6 +926,7 @@ static int gdbstub_set_breakpoint(unsigned long type, unsigned long addr, unsign
 		if (!(__debug_regs->dcr & DCR_IBE0)) {
 			//gdbstub_printk("set h/w break 0: %08lx\n", addr);
 			__debug_regs->dcr |= DCR_IBE0;
+			__debug_regs->ibar[0] = addr;
 			asm volatile("movgs %0,ibar0" : : "r"(addr));
 			return 0;
 		}
@@ -933,6 +934,7 @@ static int gdbstub_set_breakpoint(unsigned long type, unsigned long addr, unsign
 		if (!(__debug_regs->dcr & DCR_IBE1)) {
 			//gdbstub_printk("set h/w break 1: %08lx\n", addr);
 			__debug_regs->dcr |= DCR_IBE1;
+			__debug_regs->ibar[1] = addr;
 			asm volatile("movgs %0,ibar1" : : "r"(addr));
 			return 0;
 		}
@@ -940,6 +942,7 @@ static int gdbstub_set_breakpoint(unsigned long type, unsigned long addr, unsign
 		if (!(__debug_regs->dcr & DCR_IBE2)) {
 			//gdbstub_printk("set h/w break 2: %08lx\n", addr);
 			__debug_regs->dcr |= DCR_IBE2;
+			__debug_regs->ibar[2] = addr;
 			asm volatile("movgs %0,ibar2" : : "r"(addr));
 			return 0;
 		}
@@ -947,6 +950,7 @@ static int gdbstub_set_breakpoint(unsigned long type, unsigned long addr, unsign
 		if (!(__debug_regs->dcr & DCR_IBE3)) {
 			//gdbstub_printk("set h/w break 3: %08lx\n", addr);
 			__debug_regs->dcr |= DCR_IBE3;
+			__debug_regs->ibar[3] = addr;
 			asm volatile("movgs %0,ibar3" : : "r"(addr));
 			return 0;
 		}
@@ -971,7 +975,14 @@ static int gdbstub_set_breakpoint(unsigned long type, unsigned long addr, unsign
 		if (!(__debug_regs->dcr & (DCR_DRBE0|DCR_DWBE0))) {
 			//gdbstub_printk("set h/w watchpoint 0 type %ld: %08lx\n", type, addr);
 			tmp = type==2 ? DCR_DWBE0 : type==3 ? DCR_DRBE0 : DCR_DRBE0|DCR_DWBE0;
+
 			__debug_regs->dcr |= tmp;
+			__debug_regs->dbar[0] = addr;
+			__debug_regs->dbmr[0][0] = dbmr.mask0;
+			__debug_regs->dbmr[0][1] = dbmr.mask1;
+			__debug_regs->dbdr[0][0] = 0;
+			__debug_regs->dbdr[0][1] = 0;
+
 			asm volatile("	movgs	%0,dbar0	\n"
 				     "	movgs	%1,dbmr00	\n"
 				     "	movgs	%2,dbmr01	\n"
@@ -984,7 +995,14 @@ static int gdbstub_set_breakpoint(unsigned long type, unsigned long addr, unsign
 		if (!(__debug_regs->dcr & (DCR_DRBE1|DCR_DWBE1))) {
 			//gdbstub_printk("set h/w watchpoint 1 type %ld: %08lx\n", type, addr);
 			tmp = type==2 ? DCR_DWBE1 : type==3 ? DCR_DRBE1 : DCR_DRBE1|DCR_DWBE1;
+
 			__debug_regs->dcr |= tmp;
+			__debug_regs->dbar[1] = addr;
+			__debug_regs->dbmr[1][0] = dbmr.mask0;
+			__debug_regs->dbmr[1][1] = dbmr.mask1;
+			__debug_regs->dbdr[1][0] = 0;
+			__debug_regs->dbdr[1][1] = 0;
+
 			asm volatile("	movgs	%0,dbar1	\n"
 				     "	movgs	%1,dbmr10	\n"
 				     "	movgs	%2,dbmr11	\n"
@@ -1047,6 +1065,7 @@ int gdbstub_clear_breakpoint(unsigned long type, unsigned long addr, unsigned lo
 		if (__debug_regs->dcr & DCR_IBE0 && __get_ibar(0) == addr) {
 			//gdbstub_printk("clear h/w break 0: %08lx\n", addr);
 			__debug_regs->dcr &= ~DCR_IBE0;
+			__debug_regs->ibar[0] = 0;
 			asm volatile("movgs gr0,ibar0");
 			return 0;
 		}
@@ -1054,6 +1073,7 @@ int gdbstub_clear_breakpoint(unsigned long type, unsigned long addr, unsigned lo
 		if (__debug_regs->dcr & DCR_IBE1 && __get_ibar(1) == addr) {
 			//gdbstub_printk("clear h/w break 1: %08lx\n", addr);
 			__debug_regs->dcr &= ~DCR_IBE1;
+			__debug_regs->ibar[1] = 0;
 			asm volatile("movgs gr0,ibar1");
 			return 0;
 		}
@@ -1061,6 +1081,7 @@ int gdbstub_clear_breakpoint(unsigned long type, unsigned long addr, unsigned lo
 		if (__debug_regs->dcr & DCR_IBE2 && __get_ibar(2) == addr) {
 			//gdbstub_printk("clear h/w break 2: %08lx\n", addr);
 			__debug_regs->dcr &= ~DCR_IBE2;
+			__debug_regs->ibar[2] = 0;
 			asm volatile("movgs gr0,ibar2");
 			return 0;
 		}
@@ -1068,6 +1089,7 @@ int gdbstub_clear_breakpoint(unsigned long type, unsigned long addr, unsigned lo
 		if (__debug_regs->dcr & DCR_IBE3 && __get_ibar(3) == addr) {
 			//gdbstub_printk("clear h/w break 3: %08lx\n", addr);
 			__debug_regs->dcr &= ~DCR_IBE3;
+			__debug_regs->ibar[3] = 0;
 			asm volatile("movgs gr0,ibar3");
 			return 0;
 		}
@@ -1104,6 +1126,12 @@ int gdbstub_clear_breakpoint(unsigned long type, unsigned long addr, unsigned lo
 
 		//gdbstub_printk("clear h/w watchpoint 0 type %ld: %08lx\n", type, addr);
 		__debug_regs->dcr &= ~(DCR_DRBE0|DCR_DWBE0);
+		__debug_regs->dbar[0] = 0;
+		__debug_regs->dbmr[0][0] = 0;
+		__debug_regs->dbmr[0][1] = 0;
+		__debug_regs->dbdr[0][0] = 0;
+		__debug_regs->dbdr[0][1] = 0;
+
 		asm volatile("	movgs	gr0,dbar0	\n"
 			     "	movgs	gr0,dbmr00	\n"
 			     "	movgs	gr0,dbmr01	\n"
@@ -1123,6 +1151,12 @@ int gdbstub_clear_breakpoint(unsigned long type, unsigned long addr, unsigned lo
 
 		//gdbstub_printk("clear h/w watchpoint 1 type %ld: %08lx\n", type, addr);
 		__debug_regs->dcr &= ~(DCR_DRBE1|DCR_DWBE1);
+		__debug_regs->dbar[1] = 0;
+		__debug_regs->dbmr[1][0] = 0;
+		__debug_regs->dbmr[1][1] = 0;
+		__debug_regs->dbdr[1][0] = 0;
+		__debug_regs->dbdr[1][1] = 0;
+
 		asm volatile("	movgs	gr0,dbar1	\n"
 			     "	movgs	gr0,dbmr10	\n"
 			     "	movgs	gr0,dbmr11	\n"
@@ -1163,7 +1197,7 @@ static void gdbstub_check_breakpoint(void)
  */
 static void __attribute__((unused)) gdbstub_show_regs(void)
 {
-	uint32_t *reg;
+	unsigned long *reg;
 	int loop;
 
 	gdbstub_printk("\n");
@@ -1172,11 +1206,11 @@ static void __attribute__((unused)) gdbstub_show_regs(void)
 		       __debug_frame,
 		       __debug_frame->psr & PSR_S ? "kernel" : "user");
 
-	reg = (uint32_t *) __debug_frame;
-	for (loop = 0; loop < REG__END; loop++) {
-		printk("%s %08x", regnames[loop + 0], reg[loop + 0]);
+	reg = (unsigned long *) __debug_frame;
+	for (loop = 0; loop < NR_PT_REGS; loop++) {
+		printk("%s %08lx", regnames[loop + 0], reg[loop + 0]);
 
-		if (loop == REG__END - 1 || loop % 5 == 4)
+		if (loop == NR_PT_REGS - 1 || loop % 5 == 4)
 			printk("\n");
 		else
 			printk(" | ");
@@ -1191,13 +1225,8 @@ static void __attribute__((unused)) gdbstub_show_regs(void)
  */
 static void __attribute__((unused)) gdbstub_dump_debugregs(void)
 {
-	unsigned long x;
-
-	x = __debug_regs->dcr;
-	gdbstub_printk("DCR    %08lx  ", x);
-
-	x = __debug_regs->brr;
-	gdbstub_printk("BRR %08lx\n", x);
+	gdbstub_printk("DCR    %08lx  ", __debug_status.dcr);
+	gdbstub_printk("BRR    %08lx\n", __debug_status.brr);
 
 	gdbstub_printk("IBAR0  %08lx  ", __get_ibar(0));
 	gdbstub_printk("IBAR1  %08lx  ", __get_ibar(1));
@@ -1360,7 +1389,7 @@ void gdbstub(int sigval)
 #endif
 	}
 
-	save_user_regs(&__break_user_context);
+	save_user_regs(&__debug_frame0->uc);
 
 #if 0
 	gdbstub_printk("--> gdbstub() %08x %p %08x %08x\n",
@@ -1389,8 +1418,8 @@ void gdbstub(int sigval)
 		__debug_frame->psr &= ~PSR_S;
 		if (__debug_frame->psr & PSR_PS)
 			__debug_frame->psr |= PSR_S;
-		__debug_regs->brr = (__debug_frame->tbr & TBR_TT) << 12;
-		__debug_regs->brr |= BRR_EB;
+		__debug_status.brr = (__debug_frame->tbr & TBR_TT) << 12;
+		__debug_status.brr |= BRR_EB;
 		sigval = SIGINT;
 	}
 
@@ -1404,15 +1433,15 @@ void gdbstub(int sigval)
 		__debug_frame->psr &= ~PSR_S;
 		if (__debug_frame->psr & PSR_PS)
 			__debug_frame->psr |= PSR_S;
-		__debug_regs->brr = (__debug_frame->tbr & TBR_TT) << 12;
-		__debug_regs->brr |= BRR_EB;
+		__debug_status.brr = (__debug_frame->tbr & TBR_TT) << 12;
+		__debug_status.brr |= BRR_EB;
 		sigval = SIGXCPU;
 	}
 
 	LEDS(0x5002);
 
 	/* after a BREAK insn, the PC lands on the far side of it */
-	if (__debug_regs->brr & BRR_SB)
+	if (__debug_status.brr & BRR_SB)
 		gdbstub_check_breakpoint();
 
 	LEDS(0x5003);
@@ -1431,7 +1460,7 @@ void gdbstub(int sigval)
 	}
 
 	if (!sigval)
-		sigval = gdbstub_compute_signal(__debug_regs->brr);
+		sigval = gdbstub_compute_signal(__debug_status.brr);
 
 	LEDS(0x5004);
 
@@ -1441,7 +1470,7 @@ void gdbstub(int sigval)
 	if (sigval != SIGINT && sigval != SIGTRAP && sigval != SIGILL) {
 		static const char title[] = "Break ";
 		static const char crlf[] = "\r\n";
-		unsigned long brr = __debug_regs->brr;
+		unsigned long brr = __debug_status.brr;
 		char hx;
 
 		ptr = output_buffer;
@@ -1565,28 +1594,24 @@ void gdbstub(int sigval)
 			ptr = mem2hex(&zero, ptr, 4, 0);
 
 			for (loop = 1; loop <= 27; loop++)
-				ptr = mem2hex((unsigned long *)__debug_frame + REG_GR(loop),
-					      ptr, 4, 0);
+				ptr = mem2hex(&__debug_user_context->i.gr[loop], ptr, 4, 0);
 			temp = (unsigned long) __frame;
 			ptr = mem2hex(&temp, ptr, 4, 0);
-			ptr = mem2hex((unsigned long *)__debug_frame + REG_GR(29), ptr, 4, 0);
-			ptr = mem2hex((unsigned long *)__debug_frame + REG_GR(30), ptr, 4, 0);
+			ptr = mem2hex(&__debug_user_context->i.gr[29], ptr, 4, 0);
+			ptr = mem2hex(&__debug_user_context->i.gr[30], ptr, 4, 0);
 #ifdef CONFIG_MMU
-			ptr = mem2hex((unsigned long *)__debug_frame + REG_GR(31), ptr, 4, 0);
+			ptr = mem2hex(&__debug_user_context->i.gr[31], ptr, 4, 0);
 #else
 			temp = (unsigned long) __debug_frame;
 			ptr = mem2hex(&temp, ptr, 4, 0);
 #endif
 
 			for (loop = 32; loop <= 63; loop++)
-				ptr = mem2hex((unsigned long *)__debug_frame + REG_GR(loop),
-					      ptr, 4, 0);
+				ptr = mem2hex(&__debug_user_context->i.gr[loop], ptr, 4, 0);
 
 			/* deal with FR0-FR63 */
 			for (loop = 0; loop <= 63; loop++)
-				ptr = mem2hex((unsigned long *)&__break_user_context +
-					      __FPMEDIA_FR(loop),
-					      ptr, 4, 0);
+				ptr = mem2hex(&__debug_user_context->f.fr[loop], ptr, 4, 0);
 
 			/* deal with special registers */
 			ptr = mem2hex(&__debug_frame->pc,    ptr, 4, 0);
@@ -1597,7 +1622,7 @@ void gdbstub(int sigval)
 			ptr = mem2hex(&zero, ptr, 4, 0);
 			ptr = mem2hex(&zero, ptr, 4, 0);
 			ptr = mem2hex(&__debug_frame->tbr,   ptr, 4, 0);
-			ptr = mem2hex(&__debug_regs->brr ,   ptr, 4, 0);
+			ptr = mem2hex(&__debug_status.brr ,   ptr, 4, 0);
 
 			asm volatile("movsg dbar0,%0" : "=r"(dbar));
 			ptr = mem2hex(&dbar, ptr, 4, 0);
@@ -1622,21 +1647,21 @@ void gdbstub(int sigval)
 
 			ptr = mem2hex(&__debug_frame->iacc0, ptr, 8, 0);
 
-			ptr = mem2hex(&__break_user_context.f.fsr[0], ptr, 4, 0);
+			ptr = mem2hex(&__debug_user_context->f.fsr[0], ptr, 4, 0);
 
 			for (loop = 0; loop <= 7; loop++)
-				ptr = mem2hex(&__break_user_context.f.acc[loop], ptr, 4, 0);
+				ptr = mem2hex(&__debug_user_context->f.acc[loop], ptr, 4, 0);
 
-			ptr = mem2hex(&__break_user_context.f.accg, ptr, 8, 0);
+			ptr = mem2hex(&__debug_user_context->f.accg, ptr, 8, 0);
 
 			for (loop = 0; loop <= 1; loop++)
-				ptr = mem2hex(&__break_user_context.f.msr[loop], ptr, 4, 0);
+				ptr = mem2hex(&__debug_user_context->f.msr[loop], ptr, 4, 0);
 
 			ptr = mem2hex(&__debug_frame->gner0, ptr, 4, 0);
 			ptr = mem2hex(&__debug_frame->gner1, ptr, 4, 0);
 
-			ptr = mem2hex(&__break_user_context.f.fner[0], ptr, 4, 0);
-			ptr = mem2hex(&__break_user_context.f.fner[1], ptr, 4, 0);
+			ptr = mem2hex(&__debug_user_context->f.fner[0], ptr, 4, 0);
+			ptr = mem2hex(&__debug_user_context->f.fner[1], ptr, 4, 0);
 
 			break;
 
@@ -1648,8 +1673,7 @@ void gdbstub(int sigval)
 			ptr = hex2mem(ptr, &temp, 4);
 
 			for (loop = 1; loop <= 27; loop++)
-				ptr = hex2mem(ptr, (unsigned long *)__debug_frame + REG_GR(loop),
-					      4);
+				ptr = hex2mem(ptr, &__debug_user_context->i.gr[loop], 4);
 
 			ptr = hex2mem(ptr, &temp, 4);
 			__frame = (struct pt_regs *) temp;
@@ -1662,14 +1686,11 @@ void gdbstub(int sigval)
 #endif
 
 			for (loop = 32; loop <= 63; loop++)
-				ptr = hex2mem(ptr, (unsigned long *)__debug_frame + REG_GR(loop),
-					      4);
+				ptr = hex2mem(ptr, &__debug_user_context->i.gr[loop], 4);
 
 			/* deal with FR0-FR63 */
 			for (loop = 0; loop <= 63; loop++)
-				ptr = mem2hex((unsigned long *)&__break_user_context +
-					      __FPMEDIA_FR(loop),
-					      ptr, 4, 0);
+				ptr = mem2hex(&__debug_user_context->f.fr[loop], ptr, 4, 0);
 
 			/* deal with special registers */
 			ptr = hex2mem(ptr, &__debug_frame->pc,  4);
@@ -1694,21 +1715,21 @@ void gdbstub(int sigval)
 
 			ptr = hex2mem(ptr, &__debug_frame->iacc0, 8);
 
-			ptr = hex2mem(ptr, &__break_user_context.f.fsr[0], 4);
+			ptr = hex2mem(ptr, &__debug_user_context->f.fsr[0], 4);
 
 			for (loop = 0; loop <= 7; loop++)
-				ptr = hex2mem(ptr, &__break_user_context.f.acc[loop], 4);
+				ptr = hex2mem(ptr, &__debug_user_context->f.acc[loop], 4);
 
-			ptr = hex2mem(ptr, &__break_user_context.f.accg, 8);
+			ptr = hex2mem(ptr, &__debug_user_context->f.accg, 8);
 
 			for (loop = 0; loop <= 1; loop++)
-				ptr = hex2mem(ptr, &__break_user_context.f.msr[loop], 4);
+				ptr = hex2mem(ptr, &__debug_user_context->f.msr[loop], 4);
 
 			ptr = hex2mem(ptr, &__debug_frame->gner0, 4);
 			ptr = hex2mem(ptr, &__debug_frame->gner1, 4);
 
-			ptr = hex2mem(ptr, &__break_user_context.f.fner[0], 4);
-			ptr = hex2mem(ptr, &__break_user_context.f.fner[1], 4);
+			ptr = hex2mem(ptr, &__debug_user_context->f.fner[0], 4);
+			ptr = hex2mem(ptr, &__debug_user_context->f.fner[1], 4);
 
 			gdbstub_strcpy(output_buffer,"OK");
 			break;
@@ -1769,52 +1790,52 @@ void gdbstub(int sigval)
 			case GDB_REG_GR(0):
 				break;
 			case GDB_REG_GR(1) ... GDB_REG_GR(63):
-				__break_user_context.i.gr[addr - GDB_REG_GR(0)] = temp;
+				__debug_user_context->i.gr[addr - GDB_REG_GR(0)] = temp;
 				break;
 			case GDB_REG_FR(0) ... GDB_REG_FR(63):
-				__break_user_context.f.fr[addr - GDB_REG_FR(0)] = temp;
+				__debug_user_context->f.fr[addr - GDB_REG_FR(0)] = temp;
 				break;
 			case GDB_REG_PC:
-				__break_user_context.i.pc = temp;
+				__debug_user_context->i.pc = temp;
 				break;
 			case GDB_REG_PSR:
-				__break_user_context.i.psr = temp;
+				__debug_user_context->i.psr = temp;
 				break;
 			case GDB_REG_CCR:
-				__break_user_context.i.ccr = temp;
+				__debug_user_context->i.ccr = temp;
 				break;
 			case GDB_REG_CCCR:
-				__break_user_context.i.cccr = temp;
+				__debug_user_context->i.cccr = temp;
 				break;
 			case GDB_REG_BRR:
-				__debug_regs->brr = temp;
+				__debug_status.brr = temp;
 				break;
 			case GDB_REG_LR:
-				__break_user_context.i.lr = temp;
+				__debug_user_context->i.lr = temp;
 				break;
 			case GDB_REG_LCR:
-				__break_user_context.i.lcr = temp;
+				__debug_user_context->i.lcr = temp;
 				break;
 			case GDB_REG_FSR0:
-				__break_user_context.f.fsr[0] = temp;
+				__debug_user_context->f.fsr[0] = temp;
 				break;
 			case GDB_REG_ACC(0) ... GDB_REG_ACC(7):
-				__break_user_context.f.acc[addr - GDB_REG_ACC(0)] = temp;
+				__debug_user_context->f.acc[addr - GDB_REG_ACC(0)] = temp;
 				break;
 			case GDB_REG_ACCG(0):
-				*(uint32_t *) &__break_user_context.f.accg[0] = temp;
+				*(uint32_t *) &__debug_user_context->f.accg[0] = temp;
 				break;
 			case GDB_REG_ACCG(4):
-				*(uint32_t *) &__break_user_context.f.accg[4] = temp;
+				*(uint32_t *) &__debug_user_context->f.accg[4] = temp;
 				break;
 			case GDB_REG_MSR(0) ... GDB_REG_MSR(1):
-				__break_user_context.f.msr[addr - GDB_REG_MSR(0)] = temp;
+				__debug_user_context->f.msr[addr - GDB_REG_MSR(0)] = temp;
 				break;
 			case GDB_REG_GNER(0) ... GDB_REG_GNER(1):
-				__break_user_context.i.gner[addr - GDB_REG_GNER(0)] = temp;
+				__debug_user_context->i.gner[addr - GDB_REG_GNER(0)] = temp;
 				break;
 			case GDB_REG_FNER(0) ... GDB_REG_FNER(1):
-				__break_user_context.f.fner[addr - GDB_REG_FNER(0)] = temp;
+				__debug_user_context->f.fner[addr - GDB_REG_FNER(0)] = temp;
 				break;
 			default:
 				temp2 = 0;
@@ -1850,6 +1871,7 @@ void gdbstub(int sigval)
 			/* step to next instruction */
 		case 's':
 			__debug_regs->dcr |= DCR_SE;
+			__debug_status.dcr |= DCR_SE;
 			goto done;
 
 			/* set baud rate (bBB) */
@@ -1934,7 +1956,7 @@ void gdbstub(int sigval)
 	}
 
  done:
-	restore_user_regs(&__break_user_context);
+	restore_user_regs(&__debug_frame0->uc);
 
 	//gdbstub_dump_debugregs();
 	//gdbstub_printk("<-- gdbstub() %08x\n", __debug_frame->pc);
@@ -1966,7 +1988,6 @@ void __init gdbstub_init(void)
 #endif
 
 	gdbstub_printk("%s", gdbstub_banner);
-	gdbstub_printk("DCR: %x\n", __debug_regs->dcr);
 
 	gdbstub_io_init();
 
diff --git a/arch/frv/kernel/head.S b/arch/frv/kernel/head.S
index 47c990a..fecf751 100644
--- a/arch/frv/kernel/head.S
+++ b/arch/frv/kernel/head.S
@@ -11,6 +11,7 @@
 
 #include <linux/threads.h>
 #include <linux/linkage.h>
+#include <asm/thread_info.h>
 #include <asm/ptrace.h>
 #include <asm/page.h>
 #include <asm/spr-regs.h>
diff --git a/arch/frv/kernel/process.c b/arch/frv/kernel/process.c
index f0c767a..515a5ce 100644
--- a/arch/frv/kernel/process.c
+++ b/arch/frv/kernel/process.c
@@ -26,6 +26,7 @@
 #include <linux/reboot.h>
 #include <linux/interrupt.h>
 
+#include <asm/asm-offsets.h>
 #include <asm/uaccess.h>
 #include <asm/system.h>
 #include <asm/setup.h>
@@ -207,7 +208,7 @@ int copy_thread(int nr, unsigned long clone_flags,
 
 	regs0 = __kernel_frame0_ptr;
 	childregs0 = (struct pt_regs *)
-		(task_stack_page(p) + THREAD_SIZE - USER_CONTEXT_SIZE);
+		(task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE);
 	childregs = childregs0;
 
 	/* set up the userspace frame (the only place that the USP is stored) */
diff --git a/arch/frv/kernel/switch_to.S b/arch/frv/kernel/switch_to.S
index 9e5a583..b5275fa 100644
--- a/arch/frv/kernel/switch_to.S
+++ b/arch/frv/kernel/switch_to.S
@@ -11,6 +11,7 @@
 # 2 of the License, or (at your option) any later version.
 #
 ###############################################################################
+
 #include <linux/linkage.h>
 #include <asm/thread_info.h>
 #include <asm/processor.h>
@@ -30,7 +31,7 @@
 	# address of frame 0 (userspace) on current kernel stack
 	.globl		__kernel_frame0_ptr
 __kernel_frame0_ptr:
-	.long		init_thread_union + THREAD_SIZE - USER_CONTEXT_SIZE
+	.long		init_thread_union + THREAD_SIZE - FRV_FRAME0_SIZE
 
 	# address of current task
 	.globl		__kernel_current_task
diff --git a/arch/frv/kernel/traps.c b/arch/frv/kernel/traps.c
index 98ce362..2e6098c 100644
--- a/arch/frv/kernel/traps.c
+++ b/arch/frv/kernel/traps.c
@@ -20,6 +20,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 
+#include <asm/asm-offsets.h>
 #include <asm/setup.h>
 #include <asm/fpu.h>
 #include <asm/system.h>
@@ -279,20 +280,20 @@ static const char *regnames[] = {
 
 void show_regs(struct pt_regs *regs)
 {
-	uint32_t *reg;
+	unsigned long *reg;
 	int loop;
 
 	printk("\n");
 
-	printk("Frame: @%08x [%s]\n",
-	       (uint32_t) regs,
+	printk("Frame: @%08lx [%s]\n",
+	       (unsigned long) regs,
 	       regs->psr & PSR_S ? "kernel" : "user");
 
-	reg = (uint32_t *) regs;
-	for (loop = 0; loop < REG__END; loop++) {
-		printk("%s %08x", regnames[loop + 0], reg[loop + 0]);
+	reg = (unsigned long *) regs;
+	for (loop = 0; loop < NR_PT_REGS; loop++) {
+		printk("%s %08lx", regnames[loop + 0], reg[loop + 0]);
 
-		if (loop == REG__END - 1 || loop % 5 == 4)
+		if (loop == NR_PT_REGS - 1 || loop % 5 == 4)
 			printk("\n");
 		else
 			printk(" | ");
@@ -328,7 +329,7 @@ void die_if_kernel(const char *str, ...)
  */
 static void show_backtrace_regs(struct pt_regs *frame)
 {
-	uint32_t *reg;
+	unsigned long *reg;
 	int loop;
 
 	/* print the registers for this frame */
@@ -336,11 +337,11 @@ static void show_backtrace_regs(struct pt_regs *frame)
 	       frame->psr & PSR_S ? "Kernel Mode" : "User Mode",
 	       frame);
 
-	reg = (uint32_t *) frame;
-	for (loop = 0; loop < REG__END; loop++) {
-		printk("%s %08x", regnames[loop + 0], reg[loop + 0]);
+	reg = (unsigned long *) frame;
+	for (loop = 0; loop < NR_PT_REGS; loop++) {
+		printk("%s %08lx", regnames[loop + 0], reg[loop + 0]);
 
-		if (loop == REG__END - 1 || loop % 5 == 4)
+		if (loop == NR_PT_REGS - 1 || loop % 5 == 4)
 			printk("\n");
 		else
 			printk(" | ");