Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 259 insertions, 0 deletions

diff --git a/arch/frv/kernel/debug-stub.c b/arch/frv/kernel/debug-stub.c
new file mode 100644
index 000000000000..4761cc4b4a90
--- /dev/null
+++ b/arch/frv/kernel/debug-stub.c
@@ -0,0 +1,259 @@
+/* debug-stub.c: debug-mode stub
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/serial_reg.h>
+
+#include <asm/system.h>
+#include <asm/serial-regs.h>
+#include <asm/timer-regs.h>
+#include <asm/irc-regs.h>
+#include <asm/gdb-stub.h>
+#include "gdb-io.h"
+
+/* CPU board CON5 */
+#define __UART0(X) (*(volatile uint8_t *)(UART0_BASE + (UART_##X)))
+
+#define LSR_WAIT_FOR0(STATE)			\
+do {						\
+} while (!(__UART0(LSR) & UART_LSR_##STATE))
+
+#define FLOWCTL_QUERY0(LINE)	({ __UART0(MSR) & UART_MSR_##LINE; })
+#define FLOWCTL_CLEAR0(LINE)	do { __UART0(MCR) &= ~UART_MCR_##LINE; } while (0)
+#define FLOWCTL_SET0(LINE)	do { __UART0(MCR) |= UART_MCR_##LINE; } while (0)
+
+#define FLOWCTL_WAIT_FOR0(LINE)			\
+do {						\
+	gdbstub_do_rx();			\
+} while(!FLOWCTL_QUERY(LINE))
+
+static void __init debug_stub_init(void);
+
+extern asmlinkage void __break_hijack_kernel_event(void);
+extern asmlinkage void __break_hijack_kernel_event_breaks_here(void);
+
+/*****************************************************************************/
+/*
+ * debug mode handler stub
+ * - we come here with the CPU in debug mode and with exceptions disabled
+ * - handle debugging services for userspace
+ */
+asmlinkage void debug_stub(void)
+{
+	unsigned long hsr0;
+	int type = 0;
+
+	static u8 inited = 0;
+	if (!inited) {
+		debug_stub_init();
+		type = -1;
+		inited = 1;
+	}
+
+	hsr0 = __get_HSR(0);
+	if (hsr0 & HSR0_ETMD)
+		__set_HSR(0, hsr0 & ~HSR0_ETMD);
+
+	/* disable single stepping */
+	__debug_regs->dcr &= ~DCR_SE;
+
+	/* kernel mode can propose an exception be handled in debug mode by jumping to a special
+	 * location */
+	if (__debug_frame->pc == (unsigned long) __break_hijack_kernel_event_breaks_here) {
+		/* replace the debug frame with the kernel frame and discard
+		 * 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;
+	}
+
+	if (__debug_frame->pc == (unsigned long) __debug_bug_trap + 4) {
+		__debug_frame->pc = __debug_frame->lr;
+		type = __debug_frame->gr8;
+	}
+
+#ifdef CONFIG_GDBSTUB
+	gdbstub(type);
+#endif
+
+	if (hsr0 & HSR0_ETMD)
+		__set_HSR(0, __get_HSR(0) | HSR0_ETMD);
+
+} /* end debug_stub() */
+
+/*****************************************************************************/
+/*
+ * debug stub initialisation
+ */
+static void __init debug_stub_init(void)
+{
+	__set_IRR(6, 0xff000000);	/* map ERRs to NMI */
+	__set_IITMR(1, 0x20000000);	/* ERR0/1, UART0/1 IRQ detect levels */
+
+	asm volatile("	movgs	gr0,ibar0	\n"
+		     "	movgs	gr0,ibar1	\n"
+		     "	movgs	gr0,ibar2	\n"
+		     "	movgs	gr0,ibar3	\n"
+		     "	movgs	gr0,dbar0	\n"
+		     "	movgs	gr0,dbmr00	\n"
+		     "	movgs	gr0,dbmr01	\n"
+		     "	movgs	gr0,dbdr00	\n"
+		     "	movgs	gr0,dbdr01	\n"
+		     "	movgs	gr0,dbar1	\n"
+		     "	movgs	gr0,dbmr10	\n"
+		     "	movgs	gr0,dbmr11	\n"
+		     "	movgs	gr0,dbdr10	\n"
+		     "	movgs	gr0,dbdr11	\n"
+		     );
+
+	/* deal with debugging stub initialisation and initial pause */
+	if (__debug_frame->pc == (unsigned long) __debug_stub_init_break)
+		__debug_frame->pc = (unsigned long) start_kernel;
+
+	/* enable the debug events we want to trap */
+	__debug_regs->dcr = DCR_EBE;
+
+#ifdef CONFIG_GDBSTUB
+	gdbstub_init();
+#endif
+
+	__clr_MASK_all();
+	__clr_MASK(15);
+	__clr_RC(15);
+
+} /* end debug_stub_init() */
+
+/*****************************************************************************/
+/*
+ * kernel "exit" trap for gdb stub
+ */
+void debug_stub_exit(int status)
+{
+
+#ifdef CONFIG_GDBSTUB
+	gdbstub_exit(status);
+#endif
+
+} /* end debug_stub_exit() */
+
+/*****************************************************************************/
+/*
+ * send string to serial port
+ */
+void debug_to_serial(const char *p, int n)
+{
+	char ch;
+
+	for (; n > 0; n--) {
+		ch = *p++;
+		FLOWCTL_SET0(DTR);
+		LSR_WAIT_FOR0(THRE);
+		// FLOWCTL_WAIT_FOR(CTS);
+
+		if (ch == 0x0a) {
+			__UART0(TX) = 0x0d;
+			mb();
+			LSR_WAIT_FOR0(THRE);
+			// FLOWCTL_WAIT_FOR(CTS);
+		}
+		__UART0(TX) = ch;
+		mb();
+
+		FLOWCTL_CLEAR0(DTR);
+	}
+
+} /* end debug_to_serial() */
+
+/*****************************************************************************/
+/*
+ * send string to serial port
+ */
+void debug_to_serial2(const char *fmt, ...)
+{
+	va_list va;
+	char buf[64];
+	int n;
+
+	va_start(va, fmt);
+	n = vsprintf(buf, fmt, va);
+	va_end(va);
+
+	debug_to_serial(buf, n);
+
+} /* end debug_to_serial2() */
+
+/*****************************************************************************/
+/*
+ * set up the ttyS0 serial port baud rate timers
+ */
+void __init console_set_baud(unsigned baud)
+{
+	unsigned value, high, low;
+	u8 lcr;
+
+	/* work out the divisor to give us the nearest higher baud rate */
+	value = __serial_clock_speed_HZ / 16 / baud;
+
+	/* determine the baud rate range */
+	high = __serial_clock_speed_HZ / 16 / value;
+	low = __serial_clock_speed_HZ / 16 / (value + 1);
+
+	/* pick the nearest bound */
+	if (low + (high - low) / 2 > baud)
+		value++;
+
+	lcr = __UART0(LCR);
+	__UART0(LCR) |= UART_LCR_DLAB;
+	mb();
+	__UART0(DLL) = value & 0xff;
+	__UART0(DLM) = (value >> 8) & 0xff;
+	mb();
+	__UART0(LCR) = lcr;
+	mb();
+
+} /* end console_set_baud() */
+
+/*****************************************************************************/
+/*
+ *
+ */
+int __init console_get_baud(void)
+{
+	unsigned value;
+	u8 lcr;
+
+	lcr = __UART0(LCR);
+	__UART0(LCR) |= UART_LCR_DLAB;
+	mb();
+	value =  __UART0(DLM) << 8;
+	value |= __UART0(DLL);
+	__UART0(LCR) = lcr;
+	mb();
+
+	return value;
+} /* end console_get_baud() */
+
+/*****************************************************************************/
+/*
+ * display BUG() info
+ */
+#ifndef CONFIG_NO_KERNEL_MSG
+void __debug_bug_printk(const char *file, unsigned line)
+{
+	printk("kernel BUG at %s:%d!\n", file, line);
+
+} /* end __debug_bug_printk() */
+#endif