[PATCH,RFC 2.6.14 10/15] KGDB: ARM-specific changes
From: Tom Rini
Date: Thu Nov 10 2005 - 11:43:58 EST
This adds a backend, written by Deepak Saxena <dsaxena@xxxxxxxxxxx> and George
Davis <gdavis@xxxxxxxxxx> as well as support for the TI OMAP boards, ADI
Coyote, PXA2xx, and ARM Versatile. Geoff Levand <geoffrey.levand@xxxxxxxxxxx>
Nicolas Pitre, and Manish Lachwani have contributed various fixups here as
well. This should only require (on boards that don't have a custom uart)
registering the uart with KGDB to add any other boards, or using kgdboe it
should Just Work.
arch/arm/kernel/Makefile | 1
arch/arm/kernel/kgdb-jmp.S | 30 ++++
arch/arm/kernel/kgdb.c | 208 ++++++++++++++++++++++++++++++++++
arch/arm/kernel/setup.c | 5
arch/arm/kernel/traps.c | 11 +
arch/arm/mach-ixp2000/core.c | 5
arch/arm/mach-ixp2000/ixdp2x01.c | 6
arch/arm/mach-ixp4xx/coyote-setup.c | 5
arch/arm/mach-ixp4xx/ixdp425-setup.c | 12 +
arch/arm/mach-omap1/board-osk.c | 2
arch/arm/mach-omap1/serial.c | 4
arch/arm/mach-pxa/Makefile | 1
arch/arm/mach-pxa/kgdb-serial.c | 98 ++++++++++++++++
arch/arm/mach-versatile/kgdb_serial.c | 121 +++++++++++++++++++
arch/arm/mm/extable.c | 7 +
drivers/serial/amba-pl011.c | 2
include/asm-arm/kgdb.h | 87 ++++++++++++++
include/asm-arm/system.h | 41 ++++++
lib/Kconfig.debug | 2
19 files changed, 642 insertions(+), 6 deletions(-)
Index: linux-2.6.14/arch/arm/kernel/kgdb.c
===================================================================
--- /dev/null
+++ linux-2.6.14/arch/arm/kernel/kgdb.c
@@ -0,0 +1,208 @@
+/*
+ * arch/arm/kernel/kgdb.c
+ *
+ * ARM KGDB support
+ *
+ * Copyright (c) 2002-2004 MontaVista Software, Inc
+ *
+ * Authors: George Davis <davis_g@xxxxxxxxxx>
+ * Deepak Saxena <dsaxena@xxxxxxxxxxx>
+ */
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/spinlock.h>
+#include <linux/personality.h>
+#include <linux/ptrace.h>
+#include <linux/elf.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/kgdb.h>
+
+#include <asm/atomic.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/unistd.h>
+#include <asm/ptrace.h>
+#include <asm/traps.h>
+
+/* Make a local copy of the registers passed into the handler (bletch) */
+void 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[_SP] = 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_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[_SP];
+ kernel_regs->ARM_lr = gdb_regs[_LR];
+ kernel_regs->ARM_pc = gdb_regs[_PC];
+ kernel_regs->ARM_cpsr = gdb_regs[GDB_MAX_REGS - 1];
+}
+
+static inline struct pt_regs *kgdb_get_user_regs(struct task_struct *task)
+{
+ return (struct pt_regs *)
+ ((unsigned long)task->thread_info + THREAD_SIZE -
+ 8 - sizeof(struct pt_regs));
+}
+
+void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs,
+ struct task_struct *task)
+{
+ int regno;
+ struct pt_regs *thread_regs;
+
+ /* 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 = kgdb_get_user_regs(task);
+ gdb_regs[_R0] = thread_regs->ARM_r0; /* Not really valid? */
+ 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[_SP] = 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)
+{
+ long addr;
+ char *ptr;
+
+ switch (remcom_in_buffer[0]) {
+ 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
+};
+
+/*
+ * 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.
+ */
+int kgdb_arch_init(void)
+{
+ register_undef_hook(&kgdb_brkpt_hook);
+ register_undef_hook(&kgdb_compiled_brkpt_hook);
+
+ return 0;
+}
+
+struct kgdb_arch arch_kgdb_ops = {
+#ifndef __ARMEB__
+ .gdb_bpt_instr = {0xfe, 0xde, 0xff, 0xe7}
+#else
+ .gdb_bpt_instr = {0xe7, 0xff, 0xde, 0xfe}
+#endif
+};
Index: linux-2.6.14/arch/arm/kernel/kgdb-jmp.S
===================================================================
--- /dev/null
+++ linux-2.6.14/arch/arm/kernel/kgdb-jmp.S
@@ -0,0 +1,30 @@
+/*
+ * arch/arm/kernel/kgdb-jmp.S
+ *
+ * Trivial setjmp and longjmp procedures to support bus error recovery
+ * which may occur during kgdb memory read/write operations.
+ *
+ * Author: MontaVista Software, Inc. <source@xxxxxxxxxx>
+ * source@xxxxxxxxxx
+ *
+ * 2002-2005 (c) MontaVista Software, Inc. This file is licensed under the
+ * terms of the GNU General Public License version 2. This program as licensed
+ * "as is" without any warranty of any kind, whether express or implied.
+ */
+#include <linux/linkage.h>
+
+ENTRY (kgdb_fault_setjmp)
+ /* Save registers */
+ stmia r0, {r0-r14}
+ str lr,[r0, #60]
+ mrs r1,cpsr
+ str r1,[r0,#64]
+ ldr r1,[r0,#4]
+ mov r0, #0
+ mov pc,lr
+
+ENTRY (kgdb_fault_longjmp)
+ /* Restore registers */
+ mov r1,#1
+ str r1,[r0]
+ ldmia r0,{r0-pc}^
Index: linux-2.6.14/arch/arm/kernel/Makefile
===================================================================
--- linux-2.6.14.orig/arch/arm/kernel/Makefile
+++ linux-2.6.14/arch/arm/kernel/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_ARTHUR) += arthur.o
obj-$(CONFIG_ISA_DMA) += dma-isa.o
obj-$(CONFIG_PCI) += bios32.o
obj-$(CONFIG_SMP) += smp.o
+obj-$(CONFIG_KGDB) += kgdb.o kgdb-jmp.o
obj-$(CONFIG_IWMMXT) += iwmmxt.o
AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt
Index: linux-2.6.14/arch/arm/kernel/setup.c
===================================================================
--- linux-2.6.14.orig/arch/arm/kernel/setup.c
+++ linux-2.6.14/arch/arm/kernel/setup.c
@@ -785,6 +785,11 @@ void __init setup_arch(char **cmdline_p)
conswitchp = &dummy_con;
#endif
#endif
+
+#if defined(CONFIG_KGDB)
+ extern void __init early_trap_init(void);
+ early_trap_init();
+#endif
}
Index: linux-2.6.14/arch/arm/kernel/traps.c
===================================================================
--- linux-2.6.14.orig/arch/arm/kernel/traps.c
+++ linux-2.6.14/arch/arm/kernel/traps.c
@@ -270,6 +270,7 @@ asmlinkage void do_undefinstr(struct pt_
unsigned int instr;
struct undef_hook *hook;
siginfo_t info;
+ mm_segment_t fs;
void __user *pc;
/*
@@ -279,12 +280,15 @@ asmlinkage void do_undefinstr(struct pt_
*/
regs->ARM_pc -= correction;
+ fs = get_fs();
+ set_fs(KERNEL_DS);
pc = (void __user *)instruction_pointer(regs);
if (thumb_mode(regs)) {
get_user(instr, (u16 __user *)pc);
} else {
get_user(instr, (u32 __user *)pc);
}
+ set_fs(fs);
spin_lock_irq(&undef_lock);
list_for_each_entry(hook, &undef_hook, node) {
@@ -670,6 +674,13 @@ EXPORT_SYMBOL(abort);
void __init trap_init(void)
{
+#if defined(CONFIG_KGDB)
+ return;
+}
+
+void __init early_trap_init(void)
+{
+#endif
extern char __stubs_start[], __stubs_end[];
extern char __vectors_start[], __vectors_end[];
extern char __kuser_helper_start[], __kuser_helper_end[];
Index: linux-2.6.14/arch/arm/mach-ixp2000/core.c
===================================================================
--- linux-2.6.14.orig/arch/arm/mach-ixp2000/core.c
+++ linux-2.6.14/arch/arm/mach-ixp2000/core.c
@@ -34,6 +34,7 @@
#include <asm/system.h>
#include <asm/tlbflush.h>
#include <asm/pgtable.h>
+#include <asm/kgdb.h>
#include <asm/mach/map.h>
#include <asm/mach/time.h>
@@ -144,6 +145,10 @@ void __init ixp2000_map_io(void)
iotable_init(ixp2000_io_desc, ARRAY_SIZE(ixp2000_io_desc));
+#ifdef CONFIG_KGDB_8250
+ kgdb8250_add_port(0, &ixp2000_serial_port);
+#endif
+
/* Set slowport to 8-bit mode. */
ixp2000_reg_write(IXP2000_SLOWPORT_FRM, 1);
}
Index: linux-2.6.14/arch/arm/mach-ixp2000/ixdp2x01.c
===================================================================
--- linux-2.6.14.orig/arch/arm/mach-ixp2000/ixdp2x01.c
+++ linux-2.6.14/arch/arm/mach-ixp2000/ixdp2x01.c
@@ -38,6 +38,7 @@
#include <asm/system.h>
#include <asm/hardware.h>
#include <asm/mach-types.h>
+#include <asm/kgdb.h>
#include <asm/mach/pci.h>
#include <asm/mach/map.h>
@@ -175,6 +176,11 @@ static void __init ixdp2x01_map_io(void)
early_serial_setup(&ixdp2x01_serial_ports[0]);
early_serial_setup(&ixdp2x01_serial_ports[1]);
+
+#ifdef CONFIG_KGDB_8250
+ kgdb8250_add_port(0, &ixdp2x01_serial_ports[0]);
+ kgdb8250_add_port(1, &ixdp2x01_serial_ports[1]);
+#endif
}
Index: linux-2.6.14/arch/arm/mach-ixp4xx/coyote-setup.c
===================================================================
--- linux-2.6.14.orig/arch/arm/mach-ixp4xx/coyote-setup.c
+++ linux-2.6.14/arch/arm/mach-ixp4xx/coyote-setup.c
@@ -91,9 +91,12 @@ static void __init coyote_init(void)
coyote_uart_data[0].irq = IRQ_IXP4XX_UART1;
}
-
ixp4xx_sys_init();
platform_add_devices(coyote_devices, ARRAY_SIZE(coyote_devices));
+
+#ifdef CONFIG_KGDB_8250
+ kgdb8250_add_port(0, &coyote_serial_port);
+#endif
}
#ifdef CONFIG_ARCH_ADI_COYOTE
Index: linux-2.6.14/arch/arm/mach-ixp4xx/ixdp425-setup.c
===================================================================
--- linux-2.6.14.orig/arch/arm/mach-ixp4xx/ixdp425-setup.c
+++ linux-2.6.14/arch/arm/mach-ixp4xx/ixdp425-setup.c
@@ -23,6 +23,7 @@
#include <asm/irq.h>
#include <asm/mach/arch.h>
#include <asm/mach/flash.h>
+#include <asm/kgdb.h>
static struct flash_platform_data ixdp425_flash_data = {
.map_name = "cfi_probe",
@@ -77,7 +78,8 @@ static struct plat_serial8250_port ixdp4
.mapbase = IXP4XX_UART1_BASE_PHYS,
.membase = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
.irq = IRQ_IXP4XX_UART1,
- .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
+ .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
+ UPF_SHARE_IRQ,
.iotype = UPIO_MEM,
.regshift = 2,
.uartclk = IXP4XX_UART_XTAL,
@@ -86,7 +88,8 @@ static struct plat_serial8250_port ixdp4
.mapbase = IXP4XX_UART2_BASE_PHYS,
.membase = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
.irq = IRQ_IXP4XX_UART1,
- .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
+ .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
+ UPF_SHARE_IRQ,
.iotype = UPIO_MEM,
.regshift = 2,
.uartclk = IXP4XX_UART_XTAL,
@@ -121,6 +124,11 @@ static void __init ixdp425_init(void)
}
platform_add_devices(ixdp425_devices, ARRAY_SIZE(ixdp425_devices));
+
+#ifdef CONFIG_KGDB_8250
+ kgdb8250_add_port(0, &ixdp425_serial_ports[0]);
+ kgdb8250_add_port(1, &ixdp425_serial_ports[1]);
+#endif
}
#ifdef CONFIG_ARCH_IXDP425
Index: linux-2.6.14/arch/arm/mach-omap1/board-osk.c
===================================================================
--- linux-2.6.14.orig/arch/arm/mach-omap1/board-osk.c
+++ linux-2.6.14/arch/arm/mach-omap1/board-osk.c
@@ -46,7 +46,7 @@
#include <asm/arch/tc.h>
#include <asm/arch/common.h>
-static int __initdata osk_serial_ports[OMAP_MAX_NR_PORTS] = {1, 0, 0};
+static int __initdata osk_serial_ports[OMAP_MAX_NR_PORTS] = {1, 1, 1};
static struct mtd_partition osk_partitions[] = {
/* bootloader (U-Boot, etc) in first sector */
Index: linux-2.6.14/arch/arm/mach-omap1/serial.c
===================================================================
--- linux-2.6.14.orig/arch/arm/mach-omap1/serial.c
+++ linux-2.6.14/arch/arm/mach-omap1/serial.c
@@ -15,6 +15,7 @@
#include <linux/delay.h>
#include <linux/serial.h>
#include <linux/tty.h>
+#include <linux/kgdb.h>
#include <linux/serial_8250.h>
#include <linux/serial_reg.h>
@@ -194,6 +195,9 @@ void __init omap_serial_init(int ports[O
break;
}
omap_serial_reset(&serial_platform_data[i]);
+#ifdef CONFIG_KGDB_8250
+ kgdb8250_add_platform_port(i, &serial_platform_data[i]);
+#endif
}
}
Index: linux-2.6.14/arch/arm/mach-pxa/kgdb-serial.c
===================================================================
--- /dev/null
+++ linux-2.6.14/arch/arm/mach-pxa/kgdb-serial.c
@@ -0,0 +1,98 @@
+/*
+ * linux/arch/arm/mach-pxa/kgdb-serial.c
+ *
+ * Provides low level kgdb serial support hooks for PXA2xx boards
+ *
+ * Author: Nicolas Pitre
+ * Copyright: (C) 2002-2005 MontaVista Software Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/config.h>
+#include <linux/serial_reg.h>
+#include <linux/kgdb.h>
+#include <asm/processor.h>
+#include <asm/hardware.h>
+#include <asm/arch/pxa-regs.h>
+
+#if defined(CONFIG_KGDB_PXA_FFUART)
+
+#define UART FFUART
+#define CKEN_UART CKEN6_FFUART
+#define GPIO_RX_MD GPIO34_FFRXD_MD
+#define GPIO_TX_MD GPIO39_FFTXD_MD
+
+#elif defined(CONFIG_KGDB_PXA_BTUART)
+
+#define UART BTUART
+#define CKEN_UART CKEN7_BTUART
+#define GPIO_RX_MD GPIO42_BTRXD_MD
+#define GPIO_TX_MD GPIO43_BTTXD_MD
+
+#elif defined(CONFIG_KGDB_PXA_STUART)
+
+#define UART STUART
+#define CKEN_UART CKEN5_STUART
+#define GPIO_RX_MD GPIO46_STRXD_MD
+#define GPIO_TX_MD GPIO47_STTXD_MD
+
+#endif
+
+#define UART_BAUDRATE (CONFIG_KGDB_BAUDRATE)
+
+static volatile unsigned long *port = (unsigned long *)&UART;
+
+static int kgdb_serial_init(void)
+{
+ pxa_set_cken(CKEN_UART, 1);
+ pxa_gpio_mode(GPIO_RX_MD);
+ pxa_gpio_mode(GPIO_TX_MD);
+
+ port[UART_IER] = 0;
+ port[UART_LCR] = LCR_DLAB;
+ port[UART_DLL] = ((921600 / UART_BAUDRATE) & 0xff);
+ port[UART_DLM] = ((921600 / UART_BAUDRATE) >> 8);
+ port[UART_LCR] = LCR_WLS1 | LCR_WLS0;
+ port[UART_MCR] = 0;
+ port[UART_IER] = IER_UUE;
+ port[UART_FCR] = FCR_ITL_16;
+
+ return 0;
+}
+
+static void kgdb_serial_putchar(int c)
+{
+ if (!(CKEN & CKEN_UART) || port[UART_IER] != IER_UUE)
+ kgdb_serial_init();
+ while (!(port[UART_LSR] & LSR_TDRQ))
+ cpu_relax();
+ port[UART_TX] = c;
+}
+
+static void kgdb_serial_flush(void)
+{
+ if ((CKEN & CKEN_UART) && (port[UART_IER] & IER_UUE))
+ while (!(port[UART_LSR] & LSR_TEMT))
+ cpu_relax();
+}
+
+static int kgdb_serial_getchar(void)
+{
+ unsigned char c;
+ if (!(CKEN & CKEN_UART) || port[UART_IER] != IER_UUE)
+ kgdb_serial_init();
+ while (!(port[UART_LSR] & UART_LSR_DR))
+ cpu_relax();
+ c = port[UART_RX];
+ return c;
+}
+
+struct kgdb_io kgdb_io_ops = {
+ .init = kgdb_serial_init,
+ .write_char = kgdb_serial_putchar,
+ .flush = kgdb_serial_flush,
+ .read_char = kgdb_serial_getchar,
+};
Index: linux-2.6.14/arch/arm/mach-pxa/Makefile
===================================================================
--- linux-2.6.14.orig/arch/arm/mach-pxa/Makefile
+++ linux-2.6.14/arch/arm/mach-pxa/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_LEDS) += $(led-y)
# Misc features
obj-$(CONFIG_PM) += pm.o sleep.o
+obj-$(CONFIG_KGDB_PXA_SERIAL) += kgdb-serial.o
ifeq ($(CONFIG_PXA27x),y)
obj-$(CONFIG_PM) += standby.o
Index: linux-2.6.14/arch/arm/mach-versatile/kgdb_serial.c
===================================================================
--- /dev/null
+++ linux-2.6.14/arch/arm/mach-versatile/kgdb_serial.c
@@ -0,0 +1,121 @@
+/*
+ * arch/arm/mach-versatile/kgdb_serial.c
+ *
+ * Author: Manish Lachwani, mlachwani@xxxxxxxxxx
+ *
+ * 2005 (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.
+ *
+ * Support for KGDB on ARM Versatile.
+ */
+#include <linux/config.h>
+#include <linux/serial_reg.h>
+#include <linux/kgdb.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <asm/hardware.h>
+#include <asm/hardware/amba_serial.h>
+#include <asm/arch-versatile/hardware.h>
+
+#define ARM_BAUD_38400 23
+/*
+ * Functions that will be used later
+ */
+#define UART_GET_INT_STATUS(p) readb((p) + UART010_IIR)
+#define UART_GET_MIS(p) readw((p) + UART011_MIS)
+#define UART_PUT_ICR(p, c) writel((c), (p) + UART010_ICR)
+#define UART_GET_FR(p) readb((p) + UART01x_FR)
+#define UART_GET_CHAR(p) readb((p) + UART01x_DR)
+#define UART_PUT_CHAR(p, c) writel((c), (p) + UART01x_DR)
+#define UART_GET_RSR(p) readb((p) + UART01x_RSR)
+#define UART_GET_CR(p) readb((p) + UART010_CR)
+#define UART_PUT_CR(p,c) writel((c), (p) + UART010_CR)
+#define UART_GET_LCRL(p) readb((p) + UART010_LCRL)
+#define UART_PUT_LCRL(p,c) writel((c), (p) + UART010_LCRL)
+#define UART_GET_LCRM(p) readb((p) + UART010_LCRM)
+#define UART_PUT_LCRM(p,c) writel((c), (p) + UART010_LCRM)
+#define UART_GET_LCRH(p) readb((p) + UART010_LCRH)
+#define UART_PUT_LCRH(p,c) writel((c), (p) + UART010_LCRH)
+#define UART_RX_DATA(s) (((s) & UART01x_FR_RXFE) == 0)
+#define UART_TX_READY(s) (((s) & UART01x_FR_TXFF) == 0)
+#define UART_TX_EMPTY(p) ((UART_GET_FR(p) & UART01x_FR_TMSK) == 0)
+
+/*
+ * KGDB IRQ
+ */
+static int kgdb_irq = 12;
+static volatile unsigned char *port = NULL;
+
+static int kgdb_serial_init(void)
+{
+ int rate = ARM_BAUD_38400;
+
+ port = IO_ADDRESS(0x101F1000);
+ UART_PUT_CR(port, 0);
+
+ /* Set baud rate */
+ UART_PUT_LCRM(port, ((rate & 0xf00) >> 8));
+ UART_PUT_LCRL(port, (rate & 0xff));
+ UART_PUT_LCRH(port, UART01x_LCRH_WLEN_8 | UART01x_LCRH_FEN);
+ UART_PUT_CR(port, UART01x_CR_UARTEN);
+
+ return 0;
+}
+
+static void kgdb_serial_putchar(int ch)
+{
+ unsigned int status;
+
+ do {
+ status = UART_GET_FR(port);
+ } while (!UART_TX_READY(status));
+
+ UART_PUT_CHAR(port, ch);
+}
+
+static int kgdb_serial_getchar(void)
+{
+ unsigned int status;
+ int ch;
+
+ do {
+ status = UART_GET_FR(port);
+ } while (!UART_RX_DATA(status));
+ ch = UART_GET_CHAR(port);
+ return ch;
+}
+
+static struct uart_port kgdb_amba_port = {
+ .irq = 12,
+ .iobase = 0,
+ .iotype = UPIO_MEM,
+ .membase = (unsigned char *)IO_ADDRESS(0x101F1000),
+};
+
+static irqreturn_t kgdb_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ int status = UART_GET_MIS(port);
+
+ if (irq != kgdb_irq)
+ return IRQ_NONE;
+
+ if (status & 0x40)
+ breakpoint();
+
+ return IRQ_HANDLED;
+}
+
+static void __init kgdb_hookup_irq(void)
+{
+ request_irq(kgdb_irq, kgdb_interrupt, SA_SHIRQ, "GDB-stub",
+ &kgdb_amba_port);
+}
+
+struct kgdb_io kgdb_io_ops = {
+ .init = kgdb_serial_init,
+ .write_char = kgdb_serial_putchar,
+ .read_char = kgdb_serial_getchar,
+ .late_init = kgdb_hookup_irq,
+};
Index: linux-2.6.14/arch/arm/mm/extable.c
===================================================================
--- linux-2.6.14.orig/arch/arm/mm/extable.c
+++ linux-2.6.14/arch/arm/mm/extable.c
@@ -2,6 +2,7 @@
* linux/arch/arm/mm/extable.c
*/
#include <linux/module.h>
+#include <linux/kgdb.h>
#include <asm/uaccess.h>
int fixup_exception(struct pt_regs *regs)
@@ -11,6 +12,12 @@ int fixup_exception(struct pt_regs *regs
fixup = search_exception_tables(instruction_pointer(regs));
if (fixup)
regs->ARM_pc = fixup->fixup;
+#ifdef CONFIG_KGDB
+ if (atomic_read(&debugger_active) && kgdb_may_fault)
+ /* Restore our previous state. */
+ kgdb_fault_longjmp(kgdb_fault_jmp_regs);
+ /* Not reached. */
+#endif
return fixup != NULL;
}
Index: linux-2.6.14/drivers/serial/amba-pl011.c
===================================================================
--- linux-2.6.14.orig/drivers/serial/amba-pl011.c
+++ linux-2.6.14/drivers/serial/amba-pl011.c
@@ -350,7 +350,7 @@ static int pl011_startup(struct uart_por
/*
* Allocate the IRQ
*/
- retval = request_irq(uap->port.irq, pl011_int, 0, "uart-pl011", uap);
+ retval = request_irq(uap->port.irq, pl011_int, SA_SHIRQ, "uart-pl011", uap);
if (retval)
goto clk_dis;
Index: linux-2.6.14/include/asm-arm/kgdb.h
===================================================================
--- /dev/null
+++ linux-2.6.14/include/asm-arm/kgdb.h
@@ -0,0 +1,87 @@
+/*
+ * include/asm-arm/kgdb.h
+ *
+ * ARM KGDB support
+ *
+ * Author: Deepak Saxena <dsaxena@xxxxxxxxxx>
+ *
+ * Copyright (C) 2002 MontaVista Software Inc.
+ *
+ */
+
+#ifndef __ASM_KGDB_H__
+#define __ASM_KGDB_H__
+
+#include <linux/config.h>
+#include <asm/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__
+
+#define BREAKPOINT() asm(".word 0xe7ffdeff")
+
+
+extern void kgdb_handle_bus_error(void);
+extern int kgdb_fault_expected;
+
+/*
+ * From Amit S. Kale:
+ *
+ * In the register packet, words 0-15 are R0 to R10, FP, IP, SP, LR, PC. But
+ * Register 16 isn't cpsr. GDB passes CPSR in word 25. There are 9 words in
+ * between which are unused. Passing only 26 words to gdb is sufficient.
+ * GDB can figure out that floating point registers are not passed.
+ * GDB_MAX_REGS should be 26.
+ */
+#define GDB_MAX_REGS (26)
+
+#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 _SP 13
+#define _LR 14
+#define _PC 15
+#define _CPSR (GDB_MAX_REGS - 1)
+
+#endif /* !__ASSEMBLY__ */
+#endif /* __ASM_KGDB_H__ */
Index: linux-2.6.14/include/asm-arm/system.h
===================================================================
--- linux-2.6.14.orig/include/asm-arm/system.h
+++ linux-2.6.14/include/asm-arm/system.h
@@ -405,6 +405,47 @@ static inline unsigned long __xchg(unsig
return ret;
}
+#define __HAVE_ARCH_CMPXCHG 1
+
+#include <asm/types.h>
+
+static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
+ unsigned long new)
+{
+ u32 retval;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ retval = *m;
+ if (retval == old)
+ *m = new;
+ local_irq_restore(flags); /* implies memory barrier */
+
+ return retval;
+}
+
+/* This function doesn't exist, so you'll get a linker error
+ if something tries to do an invalid cmpxchg(). */
+extern void __cmpxchg_called_with_bad_pointer(void);
+
+static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
+ unsigned long new, int size)
+{
+ switch (size) {
+ case 4:
+ return __cmpxchg_u32(ptr, old, new);
+ }
+ __cmpxchg_called_with_bad_pointer();
+ return old;
+}
+
+#define cmpxchg(ptr,o,n) \
+ ({ \
+ __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _n_ = (n); \
+ (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
+ (unsigned long)_n_, sizeof(*(ptr))); \
+ })
#endif /* __ASSEMBLY__ */
#define arch_align_stack(x) (x)
Index: linux-2.6.14/lib/Kconfig.debug
===================================================================
--- linux-2.6.14.orig/lib/Kconfig.debug
+++ linux-2.6.14/lib/Kconfig.debug
@@ -187,7 +187,7 @@ config WANT_EXTRA_DEBUG_INFORMATION
config KGDB
bool "KGDB: kernel debugging with remote gdb"
select WANT_EXTRA_DEBUG_INFORMATION
- depends on DEBUG_KERNEL && (X86 || MIPS || (SUPERH && !SUPERH64) || IA64 || X86_64 || ((!SMP || BROKEN) && PPC32))
+ depends on DEBUG_KERNEL && (ARM || X86 || MIPS || (SUPERH && !SUPERH64) || IA64 || X86_64 || ((!SMP || BROKEN) && PPC32))
help
If you say Y here, it will be possible to remotely debug the
kernel using gdb. It is strongly suggested that you enable
--
Tom
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