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

arch/arm/Kconfig

@@ -12,6 +12,7 @@ config ARM
 	select RTC_LIB
 	select SYS_SUPPORTS_APM_EMULATION
 	select HAVE_OPROFILE
+	select HAVE_ARCH_KGDB
 	select HAVE_KPROBES if (!XIP_KERNEL)
 	select HAVE_KRETPROBES if (HAVE_KPROBES)
 	select HAVE_FTRACE if (!XIP_KERNEL)

arch/arm/kernel/Makefile

@@ -28,6 +28,7 @@ obj-$(CONFIG_KPROBES)		+= kprobes.o kprobes-decode.o
 obj-$(CONFIG_ATAGS_PROC)	+= atags.o
 obj-$(CONFIG_OABI_COMPAT)	+= sys_oabi-compat.o
 obj-$(CONFIG_ARM_THUMBEE)	+= thumbee.o
+obj-$(CONFIG_KGDB)		+= kgdb.o
 
 obj-$(CONFIG_CRUNCH)		+= crunch.o crunch-bits.o
 AFLAGS_crunch-bits.o		:= -Wa,-mcpu=ep9312

arch/arm/kernel/kgdb.c

+/*
+ * arch/arm/kernel/kgdb.c
+ *
+ * ARM KGDB support
+ *
+ * Copyright (c) 2002-2004 MontaVista Software, Inc
+ * Copyright (c) 2008 Wind River Systems, Inc.
+ *
+ * Authors:  George Davis <davis_g@mvista.com>
+ *           Deepak Saxena <dsaxena@plexity.net>
+ */
+#include <linux/kgdb.h>
+#include <asm/traps.h>
+
+/* Make a local copy of the registers passed into the handler (bletch) */
+void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs)
+{
+	int regno;
+
+	/* Initialize all to zero. */
+	for (regno = 0; regno < GDB_MAX_REGS; regno++)
+		gdb_regs[regno] = 0;
+
+	gdb_regs[_R0]		= kernel_regs->ARM_r0;
+	gdb_regs[_R1]		= kernel_regs->ARM_r1;
+	gdb_regs[_R2]		= kernel_regs->ARM_r2;
+	gdb_regs[_R3]		= kernel_regs->ARM_r3;
+	gdb_regs[_R4]		= kernel_regs->ARM_r4;
+	gdb_regs[_R5]		= kernel_regs->ARM_r5;
+	gdb_regs[_R6]		= kernel_regs->ARM_r6;
+	gdb_regs[_R7]		= kernel_regs->ARM_r7;
+	gdb_regs[_R8]		= kernel_regs->ARM_r8;
+	gdb_regs[_R9]		= kernel_regs->ARM_r9;
+	gdb_regs[_R10]		= kernel_regs->ARM_r10;
+	gdb_regs[_FP]		= kernel_regs->ARM_fp;
+	gdb_regs[_IP]		= kernel_regs->ARM_ip;
+	gdb_regs[_SPT]		= kernel_regs->ARM_sp;
+	gdb_regs[_LR]		= kernel_regs->ARM_lr;
+	gdb_regs[_PC]		= kernel_regs->ARM_pc;
+	gdb_regs[_CPSR]		= kernel_regs->ARM_cpsr;
+}
+
+/* Copy local gdb registers back to kgdb regs, for later copy to kernel */
+void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs)
+{
+	kernel_regs->ARM_r0	= gdb_regs[_R0];
+	kernel_regs->ARM_r1	= gdb_regs[_R1];
+	kernel_regs->ARM_r2	= gdb_regs[_R2];
+	kernel_regs->ARM_r3	= gdb_regs[_R3];
+	kernel_regs->ARM_r4	= gdb_regs[_R4];
+	kernel_regs->ARM_r5	= gdb_regs[_R5];
+	kernel_regs->ARM_r6	= gdb_regs[_R6];
+	kernel_regs->ARM_r7	= gdb_regs[_R7];
+	kernel_regs->ARM_r8	= gdb_regs[_R8];
+	kernel_regs->ARM_r9	= gdb_regs[_R9];
+	kernel_regs->ARM_r10	= gdb_regs[_R10];
+	kernel_regs->ARM_fp	= gdb_regs[_FP];
+	kernel_regs->ARM_ip	= gdb_regs[_IP];
+	kernel_regs->ARM_sp	= gdb_regs[_SPT];
+	kernel_regs->ARM_lr	= gdb_regs[_LR];
+	kernel_regs->ARM_pc	= gdb_regs[_PC];
+	kernel_regs->ARM_cpsr	= gdb_regs[_CPSR];
+}
+
+void
+sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task)
+{
+	struct pt_regs *thread_regs;
+	int regno;
+
+	/* Just making sure... */
+	if (task == NULL)
+		return;
+
+	/* Initialize to zero */
+	for (regno = 0; regno < GDB_MAX_REGS; regno++)
+		gdb_regs[regno] = 0;
+
+	/* Otherwise, we have only some registers from switch_to() */
+	thread_regs		= task_pt_regs(task);
+	gdb_regs[_R0]		= thread_regs->ARM_r0;
+	gdb_regs[_R1]		= thread_regs->ARM_r1;
+	gdb_regs[_R2]		= thread_regs->ARM_r2;
+	gdb_regs[_R3]		= thread_regs->ARM_r3;
+	gdb_regs[_R4]		= thread_regs->ARM_r4;
+	gdb_regs[_R5]		= thread_regs->ARM_r5;
+	gdb_regs[_R6]		= thread_regs->ARM_r6;
+	gdb_regs[_R7]		= thread_regs->ARM_r7;
+	gdb_regs[_R8]		= thread_regs->ARM_r8;
+	gdb_regs[_R9]		= thread_regs->ARM_r9;
+	gdb_regs[_R10]		= thread_regs->ARM_r10;
+	gdb_regs[_FP]		= thread_regs->ARM_fp;
+	gdb_regs[_IP]		= thread_regs->ARM_ip;
+	gdb_regs[_SPT]		= thread_regs->ARM_sp;
+	gdb_regs[_LR]		= thread_regs->ARM_lr;
+	gdb_regs[_PC]		= thread_regs->ARM_pc;
+	gdb_regs[_CPSR]		= thread_regs->ARM_cpsr;
+}
+
+static int compiled_break;
+
+int kgdb_arch_handle_exception(int exception_vector, int signo,
+			       int err_code, char *remcom_in_buffer,
+			       char *remcom_out_buffer,
+			       struct pt_regs *linux_regs)
+{
+	unsigned long addr;
+	char *ptr;
+
+	switch (remcom_in_buffer[0]) {
+	case 'D':
+	case 'k':
+	case 'c':
+		kgdb_contthread = NULL;
+
+		/*
+		 * Try to read optional parameter, pc unchanged if no parm.
+		 * If this was a compiled breakpoint, we need to move
+		 * to the next instruction or we will just breakpoint
+		 * over and over again.
+		 */
+		ptr = &remcom_in_buffer[1];
+		if (kgdb_hex2long(&ptr, &addr))
+			linux_regs->ARM_pc = addr;
+		else if (compiled_break == 1)
+			linux_regs->ARM_pc += 4;
+
+		compiled_break = 0;
+
+		return 0;
+	}
+
+	return -1;
+}
+
+static int kgdb_brk_fn(struct pt_regs *regs, unsigned int instr)
+{
+	kgdb_handle_exception(1, SIGTRAP, 0, regs);
+
+	return 0;
+}
+
+static int kgdb_compiled_brk_fn(struct pt_regs *regs, unsigned int instr)
+{
+	compiled_break = 1;
+	kgdb_handle_exception(1, SIGTRAP, 0, regs);
+
+	return 0;
+}
+
+static struct undef_hook kgdb_brkpt_hook = {
+	.instr_mask		= 0xffffffff,
+	.instr_val		= KGDB_BREAKINST,
+	.fn			= kgdb_brk_fn
+};
+
+static struct undef_hook kgdb_compiled_brkpt_hook = {
+	.instr_mask		= 0xffffffff,
+	.instr_val		= KGDB_COMPILED_BREAK,
+	.fn			= kgdb_compiled_brk_fn
+};
+
+/**
+ *	kgdb_arch_init - Perform any architecture specific initalization.
+ *
+ *	This function will handle the initalization of any architecture
+ *	specific callbacks.
+ */
+int kgdb_arch_init(void)
+{
+	register_undef_hook(&kgdb_brkpt_hook);
+	register_undef_hook(&kgdb_compiled_brkpt_hook);
+
+	return 0;
+}
+
+/**
+ *	kgdb_arch_exit - Perform any architecture specific uninitalization.
+ *
+ *	This function will handle the uninitalization of any architecture
+ *	specific callbacks, for dynamic registration and unregistration.
+ */
+void kgdb_arch_exit(void)
+{
+	unregister_undef_hook(&kgdb_brkpt_hook);
+	unregister_undef_hook(&kgdb_compiled_brkpt_hook);
+}
+
+/*
+ * Register our undef instruction hooks with ARM undef core.
+ * We regsiter a hook specifically looking for the KGB break inst
+ * and we handle the normal undef case within the do_undefinstr
+ * handler.
+ */
+struct kgdb_arch arch_kgdb_ops = {
+#ifndef __ARMEB__
+	.gdb_bpt_instr		= {0xfe, 0xde, 0xff, 0xe7}
+#else /* ! __ARMEB__ */
+	.gdb_bpt_instr		= {0xe7, 0xff, 0xde, 0xfe}
+#endif
+};

arch/arm/kernel/setup.c

@@ -36,6 +36,7 @@
 #include <asm/mach/arch.h>
 #include <asm/mach/irq.h>
 #include <asm/mach/time.h>
+#include <asm/traps.h>
 
 #include "compat.h"
 #include "atags.h"
@@ -853,6 +854,7 @@ void __init setup_arch(char **cmdline_p)
 	conswitchp = &dummy_con;
 #endif
 #endif
+	early_trap_init();
 }
 
 

arch/arm/kernel/traps.c

@@ -707,6 +707,11 @@ void abort(void)
 EXPORT_SYMBOL(abort);
 
 void __init trap_init(void)
+{
+	return;
+}
+
+void __init early_trap_init(void)
 {
 	unsigned long vectors = CONFIG_VECTORS_BASE;
 	extern char __stubs_start[], __stubs_end[];

arch/powerpc/Kconfig

@@ -112,6 +112,7 @@ config PPC
 	select HAVE_FTRACE
 	select HAVE_IDE
 	select HAVE_KPROBES
+	select HAVE_ARCH_KGDB
 	select HAVE_KRETPROBES
 	select HAVE_LMB
 	select HAVE_DMA_ATTRS if PPC64

arch/powerpc/Kconfig.debug

@@ -41,22 +41,6 @@ config HCALL_STATS
 	  This option will add a small amount of overhead to all hypervisor
 	  calls.
 
-config DEBUGGER
-	bool "Enable debugger hooks"
-	depends on DEBUG_KERNEL
-	help
-	  Include in-kernel hooks for kernel debuggers. Unless you are
-	  intending to debug the kernel, say N here.
-
-config KGDB
-	bool "Include kgdb kernel debugger"
-	depends on DEBUGGER && (BROKEN || PPC_GEN550 || 4xx)
-	select DEBUG_INFO
-	help
-	  Include in-kernel hooks for kgdb, the Linux kernel source level
-	  debugger.  See <http://kgdb.sourceforge.net/> for more information.
-	  Unless you are intending to debug the kernel, say N here.
-
 config CODE_PATCHING_SELFTEST
 	bool "Run self-tests of the code-patching code."
 	depends on DEBUG_KERNEL
@@ -67,36 +51,9 @@ config FTR_FIXUP_SELFTEST
 	depends on DEBUG_KERNEL
 	default n
 
-choice
-	prompt "Serial Port"
-	depends on KGDB
-	default KGDB_TTYS1
-
-config KGDB_TTYS0
-	bool "ttyS0"
-
-config KGDB_TTYS1
-	bool "ttyS1"
-
-config KGDB_TTYS2
-	bool "ttyS2"
-
-config KGDB_TTYS3
-	bool "ttyS3"
-
-endchoice
-
-config KGDB_CONSOLE
-	bool "Enable serial console thru kgdb port"
-	depends on KGDB && 8xx || CPM2
-	help
-	  If you enable this, all serial console messages will be sent
-	  over the gdb stub.
-	  If unsure, say N.
-
 config XMON
 	bool "Include xmon kernel debugger"
-	depends on DEBUGGER
+	depends on DEBUG_KERNEL
 	help
 	  Include in-kernel hooks for the xmon kernel monitor/debugger.
 	  Unless you are intending to debug the kernel, say N here.
@@ -126,6 +83,11 @@ config XMON_DISASSEMBLY
 	  to say Y here, unless you're building for a memory-constrained
 	  system.
 
+config DEBUGGER
+	bool
+	depends on KGDB || XMON
+	default y
+
 config IRQSTACKS
 	bool "Use separate kernel stacks when processing interrupts"
 	help

arch/powerpc/kernel/Makefile

@@ -74,6 +74,7 @@ obj-y				+= time.o prom.o traps.o setup-common.o \
 				   misc_$(CONFIG_WORD_SIZE).o
 obj-$(CONFIG_PPC32)		+= entry_32.o setup_32.o
 obj-$(CONFIG_PPC64)		+= dma_64.o iommu.o
+obj-$(CONFIG_KGDB)		+= kgdb.o
 obj-$(CONFIG_PPC_MULTIPLATFORM)	+= prom_init.o
 obj-$(CONFIG_MODULES)		+= ppc_ksyms.o
 obj-$(CONFIG_BOOTX_TEXT)	+= btext.o

arch/powerpc/kernel/setup_32.c

@@ -43,10 +43,6 @@
 
 #define DBG(fmt...)
 
-#if defined CONFIG_KGDB
-#include <asm/kgdb.h>
-#endif
-
 extern void bootx_init(unsigned long r4, unsigned long phys);
 
 int boot_cpuid;
@@ -302,18 +298,6 @@ void __init setup_arch(char **cmdline_p)
 
 	xmon_setup();
 
-#if defined(CONFIG_KGDB)
-	if (ppc_md.kgdb_map_scc)
-		ppc_md.kgdb_map_scc();
-	set_debug_traps();
-	if (strstr(cmd_line, "gdb")) {
-		if (ppc_md.progress)
-			ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
-		printk("kgdb breakpoint activated\n");
-		breakpoint();
-	}
-#endif
-
 	/*
 	 * Set cache line size based on type of cpu as a default.
 	 * Systems with OF can look in the properties on the cpu node(s)

arch/powerpc/platforms/powermac/setup.c

@@ -97,8 +97,6 @@ extern struct machdep_calls pmac_md;
 int sccdbg;
 #endif
 
-extern void zs_kgdb_hook(int tty_num);
-
 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
 EXPORT_SYMBOL(sys_ctrler);
 
@@ -329,10 +327,6 @@ static void __init pmac_setup_arch(void)
 	l2cr_init();
 #endif /* CONFIG_PPC32 */
 
-#ifdef CONFIG_KGDB
-	zs_kgdb_hook(0);
-#endif
-
 	find_via_cuda();
 	find_via_pmu();
 	smu_init();

drivers/serial/cpm_uart/cpm_uart_core.c

@@ -201,6 +201,10 @@ static void cpm_uart_int_tx(struct uart_port *port)
 	cpm_uart_tx_pump(port);
 }
 
+#ifdef CONFIG_CONSOLE_POLL
+static int serial_polled;
+#endif
+
 /*
  * Receive characters
  */
@@ -222,6 +226,12 @@ static void cpm_uart_int_rx(struct uart_port *port)
 	 */
 	bdp = pinfo->rx_cur;
 	for (;;) {
+#ifdef CONFIG_CONSOLE_POLL
+		if (unlikely(serial_polled)) {
+			serial_polled = 0;
+			return;
+		}
+#endif
 		/* get status */
 		status = in_be16(&bdp->cbd_sc);
 		/* If this one is empty, return happy */
@@ -253,7 +263,12 @@ static void cpm_uart_int_rx(struct uart_port *port)
 				goto handle_error;
 			if (uart_handle_sysrq_char(port, ch))
 				continue;
-
+#ifdef CONFIG_CONSOLE_POLL
+			if (unlikely(serial_polled)) {
+				serial_polled = 0;
+				return;
+			}
+#endif
 		      error_return:
 			tty_insert_flip_char(tty, ch, flg);
 
@@ -865,6 +880,80 @@ static void cpm_uart_config_port(struct uart_port *port, int flags)
 		cpm_uart_request_port(port);
 	}
 }
+
+#ifdef CONFIG_CONSOLE_POLL
+/* Serial polling routines for writing and reading from the uart while
+ * in an interrupt or debug context.
+ */
+
+#define GDB_BUF_SIZE	512	/* power of 2, please */
+
+static char poll_buf[GDB_BUF_SIZE];
+static char *pollp;
+static int poll_chars;
+
+static int poll_wait_key(char *obuf, struct uart_cpm_port *pinfo)
+{
+	u_char		c, *cp;
+	volatile cbd_t	*bdp;
+	int		i;
+
+	/* Get the address of the host memory buffer.
+	 */
+	bdp = pinfo->rx_cur;
+	while (bdp->cbd_sc & BD_SC_EMPTY)
+		;
+
+	/* If the buffer address is in the CPM DPRAM, don't
+	 * convert it.
+	 */
+	cp = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
+
+	if (obuf) {
+		i = c = bdp->cbd_datlen;
+		while (i-- > 0)
+			*obuf++ = *cp++;
+	} else
+		c = *cp;
+	bdp->cbd_sc &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV | BD_SC_ID);
+	bdp->cbd_sc |= BD_SC_EMPTY;
+
+	if (bdp->cbd_sc & BD_SC_WRAP)
+		bdp = pinfo->rx_bd_base;
+	else
+		bdp++;
+	pinfo->rx_cur = (cbd_t *)bdp;
+
+	return (int)c;
+}
+
+static int cpm_get_poll_char(struct uart_port *port)
+{
+	struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+
+	if (!serial_polled) {
+		serial_polled = 1;
+		poll_chars = 0;
+	}
+	if (poll_chars <= 0) {
+		poll_chars = poll_wait_key(poll_buf, pinfo);
+		pollp = poll_buf;
+	}
+	poll_chars--;
+	return *pollp++;
+}
+
+static void cpm_put_poll_char(struct uart_port *port,
+			 unsigned char c)
+{
+	struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+	static char ch[2];
+
+	ch[0] = (char)c;
+	cpm_uart_early_write(pinfo->port.line, ch, 1);
+}
+#endif /* CONFIG_CONSOLE_POLL */
+
 static struct uart_ops cpm_uart_pops = {
 	.tx_empty	= cpm_uart_tx_empty,
 	.set_mctrl	= cpm_uart_set_mctrl,
@@ -882,6 +971,10 @@ static struct uart_ops cpm_uart_pops = {
 	.request_port	= cpm_uart_request_port,
 	.config_port	= cpm_uart_config_port,
 	.verify_port	= cpm_uart_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+	.poll_get_char = cpm_get_poll_char,
+	.poll_put_char = cpm_put_poll_char,
+#endif
 };
 
 struct uart_cpm_port cpm_uart_ports[UART_NR];

drivers/serial/mpsc.c

@@ -921,6 +921,10 @@ static int mpsc_make_ready(struct mpsc_port_info *pi)
 	return 0;
 }
 
+#ifdef CONFIG_CONSOLE_POLL
+static int serial_polled;
+#endif
+
 /*
  ******************************************************************************
  *
@@ -956,7 +960,12 @@ static int mpsc_rx_intr(struct mpsc_port_info *pi)
 	while (!((cmdstat = be32_to_cpu(rxre->cmdstat))
 				& SDMA_DESC_CMDSTAT_O)) {
 		bytes_in = be16_to_cpu(rxre->bytecnt);
-
+#ifdef CONFIG_CONSOLE_POLL
+		if (unlikely(serial_polled)) {
+			serial_polled = 0;
+			return 0;
+		}
+#endif
 		/* Following use of tty struct directly is deprecated */
 		if (unlikely(tty_buffer_request_room(tty, bytes_in)
 					< bytes_in)) {
@@ -1017,6 +1026,12 @@ static int mpsc_rx_intr(struct mpsc_port_info *pi)
 		if (uart_handle_sysrq_char(&pi->port, *bp)) {
 			bp++;
 			bytes_in--;
+#ifdef CONFIG_CONSOLE_POLL
+			if (unlikely(serial_polled)) {
+				serial_polled = 0;
+				return 0;
+			}
+#endif
 			goto next_frame;
 		}
 
@@ -1519,6 +1534,133 @@ static int mpsc_verify_port(struct uart_port *port, struct serial_struct *ser)
 
 	return rc;
 }
+#ifdef CONFIG_CONSOLE_POLL
+/* Serial polling routines for writing and reading from the uart while
+ * in an interrupt or debug context.
+ */
+
+static char poll_buf[2048];
+static int poll_ptr;
+static int poll_cnt;
+static void mpsc_put_poll_char(struct uart_port *port,
+							   unsigned char c);
+
+static int mpsc_get_poll_char(struct uart_port *port)
+{
+	struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
+	struct mpsc_rx_desc *rxre;
+	u32	cmdstat, bytes_in, i;
+	u8	*bp;
+
+	if (!serial_polled)
+		serial_polled = 1;
+
+	pr_debug("mpsc_rx_intr[%d]: Handling Rx intr\n", pi->port.line);
+
+	if (poll_cnt) {
+		poll_cnt--;
+		return poll_buf[poll_ptr++];
+	}
+	poll_ptr = 0;
+	poll_cnt = 0;
+
+	while (poll_cnt == 0) {
+		rxre = (struct mpsc_rx_desc *)(pi->rxr +
+		       (pi->rxr_posn*MPSC_RXRE_SIZE));
+		dma_cache_sync(pi->port.dev, (void *)rxre,
+			       MPSC_RXRE_SIZE, DMA_FROM_DEVICE);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+		if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+			invalidate_dcache_range((ulong)rxre,
+			(ulong)rxre + MPSC_RXRE_SIZE);
+#endif
+		/*
+		 * Loop through Rx descriptors handling ones that have
+		 * been completed.
+		 */
+		while (poll_cnt == 0 &&
+		       !((cmdstat = be32_to_cpu(rxre->cmdstat)) &
+			 SDMA_DESC_CMDSTAT_O)){
+			bytes_in = be16_to_cpu(rxre->bytecnt);
+			bp = pi->rxb + (pi->rxr_posn * MPSC_RXBE_SIZE);
+			dma_cache_sync(pi->port.dev, (void *) bp,
+				       MPSC_RXBE_SIZE, DMA_FROM_DEVICE);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+			if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+				invalidate_dcache_range((ulong)bp,
+					(ulong)bp + MPSC_RXBE_SIZE);
+#endif
+			if ((unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR |
+			 SDMA_DESC_CMDSTAT_FR | SDMA_DESC_CMDSTAT_OR))) &&
+				!(cmdstat & pi->port.ignore_status_mask)) {
+				poll_buf[poll_cnt] = *bp;
+				poll_cnt++;
+			} else {
+				for (i = 0; i < bytes_in; i++) {
+					poll_buf[poll_cnt] = *bp++;
+					poll_cnt++;
+				}
+				pi->port.icount.rx += bytes_in;
+			}
+			rxre->bytecnt = cpu_to_be16(0);
+			wmb();
+			rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O |
+						    SDMA_DESC_CMDSTAT_EI |
+						    SDMA_DESC_CMDSTAT_F |
+						    SDMA_DESC_CMDSTAT_L);
+			wmb();
+			dma_cache_sync(pi->port.dev, (void *)rxre,
+				       MPSC_RXRE_SIZE, DMA_BIDIRECTIONAL);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+			if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+				flush_dcache_range((ulong)rxre,
+					   (ulong)rxre + MPSC_RXRE_SIZE);
+#endif
+
+			/* Advance to next descriptor */
+			pi->rxr_posn = (pi->rxr_posn + 1) &
+				(MPSC_RXR_ENTRIES - 1);
+			rxre = (struct mpsc_rx_desc *)(pi->rxr +
+				       (pi->rxr_posn * MPSC_RXRE_SIZE));
+			dma_cache_sync(pi->port.dev, (void *)rxre,
+				       MPSC_RXRE_SIZE, DMA_FROM_DEVICE);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+			if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+				invalidate_dcache_range((ulong)rxre,
+						(ulong)rxre + MPSC_RXRE_SIZE);
+#endif
+		}
+
+		/* Restart rx engine, if its stopped */
+		if ((readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_ERD) == 0)
+			mpsc_start_rx(pi);
+	}
+	if (poll_cnt) {
+		poll_cnt--;
+		return poll_buf[poll_ptr++];
+	}
+
+	return 0;
+}
+
+
+static void mpsc_put_poll_char(struct uart_port *port,
+			 unsigned char c)
+{
+	struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
+	u32 data;
+
+	data = readl(pi->mpsc_base + MPSC_MPCR);
+	writeb(c, pi->mpsc_base + MPSC_CHR_1);
+	mb();
+	data = readl(pi->mpsc_base + MPSC_CHR_2);
+	data |= MPSC_CHR_2_TTCS;
+	writel(data, pi->mpsc_base + MPSC_CHR_2);
+	mb();
+
+	while (readl(pi->mpsc_base + MPSC_CHR_2) & MPSC_CHR_2_TTCS);
+}
+#endif
 
 static struct uart_ops mpsc_pops = {
 	.tx_empty	= mpsc_tx_empty,
@@ -1537,6 +1679,10 @@ static struct uart_ops mpsc_pops = {
 	.request_port	= mpsc_request_port,
 	.config_port	= mpsc_config_port,
 	.verify_port	= mpsc_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+	.poll_get_char = mpsc_get_poll_char,
+	.poll_put_char = mpsc_put_poll_char,
+#endif
 };
 
 /*

include/asm-arm/kgdb.h

+/*
+ * 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__ */

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

include/asm-powerpc/kgdb.h

 /*
- * 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__ */

lib/Kconfig.kgdb

 
-config HAVE_ARCH_KGDB_SHADOW_INFO
-	bool
-
 config HAVE_ARCH_KGDB
 	bool