[patch 3/8] KGDB support for ppc32
From: Tom Rini
Date: Fri Oct 29 2004 - 14:04:42 EST
Cc: Matt Porter <mporter@xxxxxxxxxxxxxxxxxxx>
This adds KGDB support for ppc32 and was done by myself. Note that this
currently doesn't work on 40x || BOOKE, but that problem is more generic (the
current ppc stub doesn't work either) and Matt Porter is close to having a
tested solution now.
---
linux-2.6.10-rc1-trini/arch/ppc/Kconfig.debug | 36
linux-2.6.10-rc1-trini/arch/ppc/kernel/Makefile | 2
linux-2.6.10-rc1-trini/arch/ppc/kernel/irq.c | 5
linux-2.6.10-rc1-trini/arch/ppc/kernel/kgdb.c | 276 +++++
linux-2.6.10-rc1-trini/arch/ppc/kernel/setup.c | 16
linux-2.6.10-rc1-trini/arch/ppc/platforms/sandpoint.c | 11
linux-2.6.10-rc1-trini/arch/ppc/syslib/Makefile | 2
linux-2.6.10-rc1-trini/arch/ppc/syslib/ppc4xx_serial.c | 5
linux-2.6.10-rc1-trini/include/asm-ppc/kgdb.h | 20
linux-2.6.10-rc1-trini/lib/Kconfig.debug | 2
linux-2.6.10-rc1/arch/ppc/kernel/ppc-stub.c | 879 -----------------
linux-2.6.10-rc1/arch/ppc/syslib/gen550_kgdb.c | 86 -
linux-2.6.10-rc1/arch/ppc/syslib/ppc4xx_kgdb.c | 124 --
13 files changed, 295 insertions(+), 1169 deletions(-)
diff -puN arch/ppc/Kconfig.debug~ppc-lite arch/ppc/Kconfig.debug
--- linux-2.6.10-rc1/arch/ppc/Kconfig.debug~ppc-lite 2004-10-29 11:26:44.705391556 -0700
+++ linux-2.6.10-rc1-trini/arch/ppc/Kconfig.debug 2004-10-29 11:26:44.729385922 -0700
@@ -2,42 +2,6 @@ menu "Kernel hacking"
source "lib/Kconfig.debug"
-config KGDB
- bool "Include kgdb kernel debugger"
- depends on DEBUG_KERNEL && (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.
-
-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 DEBUG_KERNEL
diff -puN arch/ppc/kernel/Makefile~ppc-lite arch/ppc/kernel/Makefile
--- linux-2.6.10-rc1/arch/ppc/kernel/Makefile~ppc-lite 2004-10-29 11:26:44.706391321 -0700
+++ linux-2.6.10-rc1-trini/arch/ppc/kernel/Makefile 2004-10-29 11:26:44.729385922 -0700
@@ -20,7 +20,7 @@ obj-$(CONFIG_POWER4) += cpu_setup_power
obj-$(CONFIG_MODULES) += module.o ppc_ksyms.o
obj-$(CONFIG_NOT_COHERENT_CACHE) += dma-mapping.o
obj-$(CONFIG_PCI) += pci.o
-obj-$(CONFIG_KGDB) += ppc-stub.o
+obj-$(CONFIG_KGDB) += kgdb.o
obj-$(CONFIG_SMP) += smp.o smp-tbsync.o
obj-$(CONFIG_TAU) += temp.o
obj-$(CONFIG_ALTIVEC) += vecemu.o vector.o
diff -puN arch/ppc/kernel/irq.c~ppc-lite arch/ppc/kernel/irq.c
--- linux-2.6.10-rc1/arch/ppc/kernel/irq.c~ppc-lite 2004-10-29 11:26:44.708390852 -0700
+++ linux-2.6.10-rc1-trini/arch/ppc/kernel/irq.c 2004-10-29 11:26:44.730385688 -0700
@@ -48,6 +48,7 @@
#include <linux/cpumask.h>
#include <linux/profile.h>
#include <linux/bitops.h>
+#include <linux/kgdb.h>
#include <asm/uaccess.h>
#include <asm/system.h>
@@ -155,7 +156,9 @@ void do_IRQ(struct pt_regs *regs)
if (irq != -2 && first)
/* That's not SMP safe ... but who cares ? */
ppc_spurious_interrupts++;
- irq_exit();
+ irq_exit();
+
+ kgdb_process_breakpoint();
}
void __init init_IRQ(void)
diff -puN /dev/null arch/ppc/kernel/kgdb.c
--- /dev/null 2004-10-25 00:35:20.587727328 -0700
+++ linux-2.6.10-rc1-trini/arch/ppc/kernel/kgdb.c 2004-10-29 11:26:44.730385688 -0700
@@ -0,0 +1,276 @@
+/*
+ *
+ * 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, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ */
+
+/*
+ * 1998 (c) Michael AK Tesch (tesch@xxxxxxxxxxx)
+ * Copyright (C) 2003 Timesys Corporation.
+ * KGDB for the PowerPC processor
+ */
+
+#include <linux/kernel.h>
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/debugger.h>
+#include <linux/kgdb.h>
+#include <asm/current.h>
+#include <asm/ptrace.h>
+#include <asm/processor.h>
+#include <asm/machdep.h>
+
+/* Convert the hardware trap type code to a unix signal number. */
+/*
+ * This table contains the mapping between PowerPC hardware trap types, and
+ * signals, which are primarily what GDB understands.
+ */
+static struct hard_trap_info
+{
+ unsigned int tt; /* Trap type code for powerpc */
+ unsigned char signo; /* Signal that we map this trap into */
+} hard_trap_info[] = {
+#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
+ { 0x0100, 0x02 /* SIGINT */ }, /* critical input interrupt */
+ { 0x0200, 0x0b /* SIGSEGV */ }, /* machine check */
+ { 0x0300, 0x0b /* SIGSEGV */ }, /* data storage */
+ { 0x0400, 0x0a /* SIGBUS */ }, /* instruction storage */
+ { 0x0500, 0x02 /* SIGINT */ }, /* interrupt */
+ { 0x0600, 0x0a /* SIGBUS */ }, /* alignment */
+ { 0x0700, 0x04 /* SIGILL */ }, /* program */
+ { 0x0800, 0x04 /* SIGILL */ }, /* reserved */
+ { 0x0900, 0x04 /* SIGILL */ }, /* reserved */
+ { 0x0a00, 0x04 /* SIGILL */ }, /* reserved */
+ { 0x0b00, 0x04 /* SIGILL */ }, /* reserved */
+ { 0x0c00, 0x14 /* SIGCHLD */ }, /* syscall */
+ { 0x0d00, 0x04 /* SIGILL */ }, /* reserved */
+ { 0x0e00, 0x04 /* SIGILL */ }, /* reserved */
+ { 0x0f00, 0x04 /* SIGILL */ }, /* reserved */
+ { 0x2000, 0x05 /* SIGTRAP */}, /* debug */
+#else
+ { 0x0200, 0x0b /* SIGSEGV */ }, /* machine check */
+ { 0x0300, 0x0b /* SIGSEGV */ }, /* address error (store) */
+ { 0x0400, 0x0a /* SIGBUS */ }, /* instruction bus error */
+ { 0x0500, 0x02 /* SIGINT */ }, /* interrupt */
+ { 0x0600, 0x0a /* SIGBUS */ }, /* alingment */
+ { 0x0700, 0x05 /* SIGTRAP */ }, /* breakpoint trap */
+ { 0x0800, 0x08 /* SIGFPE */}, /* fpu unavail */
+ { 0x0900, 0x0e /* SIGALRM */ }, /* decrementer */
+ { 0x0a00, 0x04 /* SIGILL */ }, /* reserved */
+ { 0x0b00, 0x04 /* SIGILL */ }, /* reserved */
+ { 0x0c00, 0x14 /* SIGCHLD */ }, /* syscall */
+ { 0x0d00, 0x05 /* SIGTRAP */ }, /* single-step/watch */
+ { 0x0e00, 0x08 /* SIGFPE */ }, /* fp assist */
+#endif
+ { 0x0000, 0x000 } /* Must be last */
+};
+
+extern atomic_t cpu_doing_single_step;
+
+static int computeSignal(unsigned int tt)
+{
+ struct hard_trap_info *ht;
+
+ for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
+ if (ht->tt == tt)
+ return ht->signo;
+
+ return SIGHUP; /* default for things we don't know about */
+}
+
+/*
+ * Routines
+ */
+static void kgdb_debugger (struct pt_regs *regs)
+{
+ (*linux_debug_hook) (0, computeSignal(regs->trap), 0, regs);
+}
+
+static int kgdb_breakpoint (struct pt_regs *regs)
+{
+ if (user_mode(regs))
+ return 0;
+
+ (*linux_debug_hook) (0, SIGTRAP, 0, regs);
+
+ if (atomic_read (&kgdb_setting_breakpoint))
+ regs->nip += 4;
+
+ return 1;
+}
+
+static int kgdb_singlestep (struct pt_regs *regs)
+{
+ if (user_mode(regs))
+ return 0;
+
+ (*linux_debug_hook) (0, SIGTRAP, 0, regs);
+ return 1;
+}
+
+int kgdb_iabr_match(struct pt_regs *regs)
+{
+ if (user_mode(regs))
+ return 0;
+
+ (*linux_debug_hook) (0, computeSignal(regs->trap), 0, regs);
+ return 1;
+}
+
+int kgdb_dabr_match(struct pt_regs *regs)
+{
+ if (user_mode(regs))
+ return 0;
+
+ (*linux_debug_hook) (0, computeSignal(regs->trap), 0, regs);
+ return 1;
+}
+
+void regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+ int reg;
+ unsigned long *ptr = gdb_regs;
+
+ memset(gdb_regs, 0, MAXREG*4);
+
+ for (reg = 0; reg < 32; reg++)
+ *(ptr++) = regs->gpr[reg];
+
+ for (reg = 0; reg < 64; reg++)
+ *(ptr++) = 0;
+
+ *(ptr++) = regs->nip;
+ *(ptr++) = regs->msr;
+ *(ptr++) = regs->ccr;
+ *(ptr++) = regs->link;
+ *(ptr++) = regs->ctr;
+ *(ptr++) = regs->xer;
+}
+
+void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
+{
+ struct pt_regs *regs = (struct pt_regs *) (p->thread.ksp +
+ STACK_FRAME_OVERHEAD);
+ int reg;
+ unsigned long *ptr = gdb_regs;
+
+ memset(gdb_regs, 0, MAXREG*4);
+
+ /* Regs GPR0-2 */
+ for (reg = 0; reg < 3; reg++)
+ *(ptr++) = regs->gpr[reg];
+
+ /* Regs GPR3-13 are not saved */
+ for (reg = 3; reg < 14; reg++)
+ *(ptr++) = 0;
+
+ /* Regs GPR14-31 */
+ for (reg = 14; reg < 32; reg++)
+ *(ptr++) = regs->gpr[reg];
+
+ for (reg = 0; reg < 64; reg++)
+ *(ptr++) = 0;
+
+ *(ptr++) = regs->nip;
+ *(ptr++) = regs->msr;
+ *(ptr++) = regs->ccr;
+ *(ptr++) = regs->link;
+ *(ptr++) = regs->ctr;
+ *(ptr++) = regs->xer;
+}
+
+void gdb_regs_to_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+ int reg;
+ unsigned long *ptr = gdb_regs;
+
+ for (reg = 0; reg < 32; reg++)
+ regs->gpr[reg] = *(ptr++);
+
+ for (reg = 0; reg < 64; reg++)
+ ptr++;
+
+ regs->nip = *(ptr++);
+ regs->msr = *(ptr++);
+ regs->ccr = *(ptr++);
+ regs->link = *(ptr++);
+ regs->ctr = *(ptr++);
+ regs->xer = *(ptr++);
+}
+
+/*
+ * This function does PoerPC specific procesing for interfacing to gdb.
+ */
+int kgdb_arch_handle_exception (int vector, int signo, int err_code,
+ char *remcom_in_buffer, char *remcom_out_buffer,
+ struct pt_regs *linux_regs)
+{
+ char *ptr;
+ unsigned long addr;
+
+ switch (remcom_in_buffer[0])
+ {
+ /*
+ * sAA..AA Step one instruction from AA..AA
+ * This will return an error to gdb ..
+ */
+ case 's':
+ case 'c':
+ if (kgdb_contthread && kgdb_contthread != current)
+ {
+ strcpy(remcom_out_buffer, "E00");
+ break;
+ }
+
+ /* handle the optional parameter */
+ ptr = &remcom_in_buffer[1];
+ if (kgdb_hex2long (&ptr, &addr))
+ linux_regs->nip = addr;
+
+ atomic_set(&cpu_doing_single_step,-1);
+ /* set the trace bit if we're stepping */
+ if (remcom_in_buffer[0] == 's')
+ {
+#if defined (CONFIG_40x) || defined(CONFIG_BOOKE)
+ linux_regs->msr |= MSR_DE;
+ current->thread.dbcr0 |= (DBCR0_IDM | DBCR0_IC);
+#else
+ linux_regs->msr |= MSR_SE;
+#endif
+ debugger_step = 1;
+ if (kgdb_contthread)
+ atomic_set(&cpu_doing_single_step,smp_processor_id());
+ }
+ return 0;
+ }
+
+ return -1;
+}
+
+/*
+ * Global data
+ */
+struct kgdb_arch arch_kgdb_ops =
+{
+ .gdb_bpt_instr = { 0x7d, 0x82, 0x10, 0x08 },
+};
+
+int kgdb_arch_init (void)
+{
+ debugger = kgdb_debugger;
+ debugger_bpt = kgdb_breakpoint;
+ debugger_sstep = kgdb_singlestep;
+ debugger_iabr_match = kgdb_iabr_match;
+ debugger_dabr_match = kgdb_dabr_match;
+
+ return 0;
+}
+arch_initcall(kgdb_arch_init);
diff -L arch/ppc/kernel/ppc-stub.c -puN arch/ppc/kernel/ppc-stub.c~ppc-lite /dev/null
--- linux-2.6.10-rc1/arch/ppc/kernel/ppc-stub.c
+++ /dev/null 2004-10-25 00:35:20.587727328 -0700
@@ -1,879 +0,0 @@
-/*
- * ppc-stub.c: KGDB support for the Linux kernel.
- *
- * adapted from arch/sparc/kernel/sparc-stub.c for the PowerPC
- * some stuff borrowed from Paul Mackerras' xmon
- * Copyright (C) 1998 Michael AK Tesch (tesch@xxxxxxxxxxx)
- *
- * Modifications to run under Linux
- * Copyright (C) 1995 David S. Miller (davem@xxxxxxxxxxxxxxxx)
- *
- * This file originally came from the gdb sources, and the
- * copyright notices have been retained below.
- */
-
-/****************************************************************************
-
- THIS SOFTWARE IS NOT COPYRIGHTED
-
- HP offers the following for use in the public domain. HP makes no
- warranty with regard to the software or its performance and the
- user accepts the software "AS IS" with all faults.
-
- HP DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WITH REGARD
- TO THIS SOFTWARE INCLUDING BUT NOT LIMITED TO THE WARRANTIES
- OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
-
-****************************************************************************/
-
-/****************************************************************************
- * Header: remcom.c,v 1.34 91/03/09 12:29:49 glenne Exp $
- *
- * Module name: remcom.c $
- * Revision: 1.34 $
- * Date: 91/03/09 12:29:49 $
- * Contributor: Lake Stevens Instrument Division$
- *
- * Description: low level support for gdb debugger. $
- *
- * Considerations: only works on target hardware $
- *
- * Written by: Glenn Engel $
- * ModuleState: Experimental $
- *
- * NOTES: See Below $
- *
- * Modified for SPARC by Stu Grossman, Cygnus Support.
- *
- * This code has been extensively tested on the Fujitsu SPARClite demo board.
- *
- * To enable debugger support, two things need to happen. One, a
- * call to set_debug_traps() is necessary in order to allow any breakpoints
- * or error conditions to be properly intercepted and reported to gdb.
- * Two, a breakpoint needs to be generated to begin communication. This
- * is most easily accomplished by a call to breakpoint(). Breakpoint()
- * simulates a breakpoint by executing a trap #1.
- *
- *************
- *
- * The following gdb commands are supported:
- *
- * command function Return value
- *
- * g return the value of the CPU registers hex data or ENN
- * G set the value of the CPU registers OK or ENN
- * qOffsets Get section offsets. Reply is Text=xxx;Data=yyy;Bss=zzz
- *
- * mAA..AA,LLLL Read LLLL bytes at address AA..AA hex data or ENN
- * MAA..AA,LLLL: Write LLLL bytes at address AA.AA OK or ENN
- *
- * c Resume at current address SNN ( signal NN)
- * cAA..AA Continue at address AA..AA SNN
- *
- * s Step one instruction SNN
- * sAA..AA Step one instruction from AA..AA SNN
- *
- * k kill
- *
- * ? What was the last sigval ? SNN (signal NN)
- *
- * bBB..BB Set baud rate to BB..BB OK or BNN, then sets
- * baud rate
- *
- * All commands and responses are sent with a packet which includes a
- * checksum. A packet consists of
- *
- * $<packet info>#<checksum>.
- *
- * where
- * <packet info> :: <characters representing the command or response>
- * <checksum> :: <two hex digits computed as modulo 256 sum of <packetinfo>>
- *
- * When a packet is received, it is first acknowledged with either '+' or '-'.
- * '+' indicates a successful transfer. '-' indicates a failed transfer.
- *
- * Example:
- *
- * Host: Reply:
- * $m0,10#2a +$00010203040506070809101112131415#42
- *
- ****************************************************************************/
-
-#include <linux/config.h>
-#include <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/smp_lock.h>
-#include <linux/init.h>
-#include <linux/sysrq.h>
-
-#include <asm/cacheflush.h>
-#include <asm/system.h>
-#include <asm/signal.h>
-#include <asm/kgdb.h>
-#include <asm/pgtable.h>
-#include <asm/ptrace.h>
-
-void breakinst(void);
-
-/*
- * BUFMAX defines the maximum number of characters in inbound/outbound buffers
- * at least NUMREGBYTES*2 are needed for register packets
- */
-#define BUFMAX 2048
-static char remcomInBuffer[BUFMAX];
-static char remcomOutBuffer[BUFMAX];
-
-static int initialized;
-static int kgdb_active;
-static int kgdb_started;
-static u_int fault_jmp_buf[100];
-static int kdebug;
-
-
-static const char hexchars[]="0123456789abcdef";
-
-/* Place where we save old trap entries for restoration - sparc*/
-/* struct tt_entry kgdb_savettable[256]; */
-/* typedef void (*trapfunc_t)(void); */
-
-static void kgdb_fault_handler(struct pt_regs *regs);
-static int handle_exception (struct pt_regs *regs);
-
-#if 0
-/* Install an exception handler for kgdb */
-static void exceptionHandler(int tnum, unsigned int *tfunc)
-{
- /* We are dorking with a live trap table, all irqs off */
-}
-#endif
-
-int
-kgdb_setjmp(long *buf)
-{
- asm ("mflr 0; stw 0,0(%0);"
- "stw 1,4(%0); stw 2,8(%0);"
- "mfcr 0; stw 0,12(%0);"
- "stmw 13,16(%0)"
- : : "r" (buf));
- /* XXX should save fp regs as well */
- return 0;
-}
-void
-kgdb_longjmp(long *buf, int val)
-{
- if (val == 0)
- val = 1;
- asm ("lmw 13,16(%0);"
- "lwz 0,12(%0); mtcrf 0x38,0;"
- "lwz 0,0(%0); lwz 1,4(%0); lwz 2,8(%0);"
- "mtlr 0; mr 3,%1"
- : : "r" (buf), "r" (val));
-}
-/* Convert ch from a hex digit to an int */
-static int
-hex(unsigned char ch)
-{
- if (ch >= 'a' && ch <= 'f')
- return ch-'a'+10;
- if (ch >= '0' && ch <= '9')
- return ch-'0';
- if (ch >= 'A' && ch <= 'F')
- return ch-'A'+10;
- return -1;
-}
-
-/* Convert the memory pointed to by mem into hex, placing result in buf.
- * Return a pointer to the last char put in buf (null), in case of mem fault,
- * return 0.
- */
-static unsigned char *
-mem2hex(const char *mem, char *buf, int count)
-{
- unsigned char ch;
- unsigned short tmp_s;
- unsigned long tmp_l;
-
- if (kgdb_setjmp((long*)fault_jmp_buf) == 0) {
- debugger_fault_handler = kgdb_fault_handler;
-
- /* Accessing 16 bit and 32 bit objects in a single
- ** load instruction is required to avoid bad side
- ** effects for some IO registers.
- */
-
- if ((count == 2) && (((long)mem & 1) == 0)) {
- tmp_s = *(unsigned short *)mem;
- mem += 2;
- *buf++ = hexchars[(tmp_s >> 12) & 0xf];
- *buf++ = hexchars[(tmp_s >> 8) & 0xf];
- *buf++ = hexchars[(tmp_s >> 4) & 0xf];
- *buf++ = hexchars[tmp_s & 0xf];
-
- } else if ((count == 4) && (((long)mem & 3) == 0)) {
- tmp_l = *(unsigned int *)mem;
- mem += 4;
- *buf++ = hexchars[(tmp_l >> 28) & 0xf];
- *buf++ = hexchars[(tmp_l >> 24) & 0xf];
- *buf++ = hexchars[(tmp_l >> 20) & 0xf];
- *buf++ = hexchars[(tmp_l >> 16) & 0xf];
- *buf++ = hexchars[(tmp_l >> 12) & 0xf];
- *buf++ = hexchars[(tmp_l >> 8) & 0xf];
- *buf++ = hexchars[(tmp_l >> 4) & 0xf];
- *buf++ = hexchars[tmp_l & 0xf];
-
- } else {
- while (count-- > 0) {
- ch = *mem++;
- *buf++ = hexchars[ch >> 4];
- *buf++ = hexchars[ch & 0xf];
- }
- }
-
- } else {
- /* error condition */
- }
- debugger_fault_handler = NULL;
- *buf = 0;
- return buf;
-}
-
-/* convert the hex array pointed to by buf into binary to be placed in mem
- * return a pointer to the character AFTER the last byte written.
-*/
-static char *
-hex2mem(char *buf, char *mem, int count)
-{
- unsigned char ch;
- int i;
- char *orig_mem;
- unsigned short tmp_s;
- unsigned long tmp_l;
-
- orig_mem = mem;
-
- if (kgdb_setjmp((long*)fault_jmp_buf) == 0) {
- debugger_fault_handler = kgdb_fault_handler;
-
- /* Accessing 16 bit and 32 bit objects in a single
- ** store instruction is required to avoid bad side
- ** effects for some IO registers.
- */
-
- if ((count == 2) && (((long)mem & 1) == 0)) {
- tmp_s = hex(*buf++) << 12;
- tmp_s |= hex(*buf++) << 8;
- tmp_s |= hex(*buf++) << 4;
- tmp_s |= hex(*buf++);
-
- *(unsigned short *)mem = tmp_s;
- mem += 2;
-
- } else if ((count == 4) && (((long)mem & 3) == 0)) {
- tmp_l = hex(*buf++) << 28;
- tmp_l |= hex(*buf++) << 24;
- tmp_l |= hex(*buf++) << 20;
- tmp_l |= hex(*buf++) << 16;
- tmp_l |= hex(*buf++) << 12;
- tmp_l |= hex(*buf++) << 8;
- tmp_l |= hex(*buf++) << 4;
- tmp_l |= hex(*buf++);
-
- *(unsigned long *)mem = tmp_l;
- mem += 4;
-
- } else {
- for (i=0; i<count; i++) {
- ch = hex(*buf++) << 4;
- ch |= hex(*buf++);
- *mem++ = ch;
- }
- }
-
-
- /*
- ** Flush the data cache, invalidate the instruction cache.
- */
- flush_icache_range((int)orig_mem, (int)orig_mem + count - 1);
-
- } else {
- /* error condition */
- }
- debugger_fault_handler = NULL;
- return mem;
-}
-
-/*
- * While we find nice hex chars, build an int.
- * Return number of chars processed.
- */
-static int
-hexToInt(char **ptr, int *intValue)
-{
- int numChars = 0;
- int hexValue;
-
- *intValue = 0;
-
- if (kgdb_setjmp((long*)fault_jmp_buf) == 0) {
- debugger_fault_handler = kgdb_fault_handler;
- while (**ptr) {
- hexValue = hex(**ptr);
- if (hexValue < 0)
- break;
-
- *intValue = (*intValue << 4) | hexValue;
- numChars ++;
-
- (*ptr)++;
- }
- } else {
- /* error condition */
- }
- debugger_fault_handler = NULL;
-
- return (numChars);
-}
-
-/* scan for the sequence $<data>#<checksum> */
-static void
-getpacket(char *buffer)
-{
- unsigned char checksum;
- unsigned char xmitcsum;
- int i;
- int count;
- unsigned char ch;
-
- do {
- /* wait around for the start character, ignore all other
- * characters */
- while ((ch = (getDebugChar() & 0x7f)) != '$') ;
-
- checksum = 0;
- xmitcsum = -1;
-
- count = 0;
-
- /* now, read until a # or end of buffer is found */
- while (count < BUFMAX) {
- ch = getDebugChar() & 0x7f;
- if (ch == '#')
- break;
- checksum = checksum + ch;
- buffer[count] = ch;
- count = count + 1;
- }
-
- if (count >= BUFMAX)
- continue;
-
- buffer[count] = 0;
-
- if (ch == '#') {
- xmitcsum = hex(getDebugChar() & 0x7f) << 4;
- xmitcsum |= hex(getDebugChar() & 0x7f);
- if (checksum != xmitcsum)
- putDebugChar('-'); /* failed checksum */
- else {
- putDebugChar('+'); /* successful transfer */
- /* if a sequence char is present, reply the ID */
- if (buffer[2] == ':') {
- putDebugChar(buffer[0]);
- putDebugChar(buffer[1]);
- /* remove sequence chars from buffer */
- count = strlen(buffer);
- for (i=3; i <= count; i++)
- buffer[i-3] = buffer[i];
- }
- }
- }
- } while (checksum != xmitcsum);
-}
-
-/* send the packet in buffer. */
-static void putpacket(unsigned char *buffer)
-{
- unsigned char checksum;
- int count;
- unsigned char ch, recv;
-
- /* $<packet info>#<checksum>. */
- do {
- putDebugChar('$');
- checksum = 0;
- count = 0;
-
- while ((ch = buffer[count])) {
- putDebugChar(ch);
- checksum += ch;
- count += 1;
- }
-
- putDebugChar('#');
- putDebugChar(hexchars[checksum >> 4]);
- putDebugChar(hexchars[checksum & 0xf]);
- recv = getDebugChar();
- } while ((recv & 0x7f) != '+');
-}
-
-static void kgdb_flush_cache_all(void)
-{
- flush_instruction_cache();
-}
-
-/* Set up exception handlers for tracing and breakpoints
- * [could be called kgdb_init()]
- */
-void set_debug_traps(void)
-{
-#if 0
- unsigned char c;
-
- save_and_cli(flags);
-
- /* In case GDB is started before us, ack any packets (presumably
- * "$?#xx") sitting there.
- *
- * I've found this code causes more problems than it solves,
- * so that's why it's commented out. GDB seems to work fine
- * now starting either before or after the kernel -bwb
- */
-
- while((c = getDebugChar()) != '$');
- while((c = getDebugChar()) != '#');
- c = getDebugChar(); /* eat first csum byte */
- c = getDebugChar(); /* eat second csum byte */
- putDebugChar('+'); /* ack it */
-#endif
- debugger = kgdb;
- debugger_bpt = kgdb_bpt;
- debugger_sstep = kgdb_sstep;
- debugger_iabr_match = kgdb_iabr_match;
- debugger_dabr_match = kgdb_dabr_match;
-
- initialized = 1;
-}
-
-static void kgdb_fault_handler(struct pt_regs *regs)
-{
- kgdb_longjmp((long*)fault_jmp_buf, 1);
-}
-
-int kgdb_bpt(struct pt_regs *regs)
-{
- return handle_exception(regs);
-}
-
-int kgdb_sstep(struct pt_regs *regs)
-{
- return handle_exception(regs);
-}
-
-void kgdb(struct pt_regs *regs)
-{
- handle_exception(regs);
-}
-
-int kgdb_iabr_match(struct pt_regs *regs)
-{
- printk(KERN_ERR "kgdb doesn't support iabr, what?!?\n");
- return handle_exception(regs);
-}
-
-int kgdb_dabr_match(struct pt_regs *regs)
-{
- printk(KERN_ERR "kgdb doesn't support dabr, what?!?\n");
- return handle_exception(regs);
-}
-
-/* Convert the hardware trap type code to a unix signal number. */
-/*
- * This table contains the mapping between PowerPC hardware trap types, and
- * signals, which are primarily what GDB understands.
- */
-static struct hard_trap_info
-{
- unsigned int tt; /* Trap type code for powerpc */
- unsigned char signo; /* Signal that we map this trap into */
-} hard_trap_info[] = {
-#if defined(CONFIG_40x)
- { 0x100, SIGINT }, /* critical input interrupt */
- { 0x200, SIGSEGV }, /* machine check */
- { 0x300, SIGSEGV }, /* data storage */
- { 0x400, SIGBUS }, /* instruction storage */
- { 0x500, SIGINT }, /* interrupt */
- { 0x600, SIGBUS }, /* alignment */
- { 0x700, SIGILL }, /* program */
- { 0x800, SIGILL }, /* reserved */
- { 0x900, SIGILL }, /* reserved */
- { 0xa00, SIGILL }, /* reserved */
- { 0xb00, SIGILL }, /* reserved */
- { 0xc00, SIGCHLD }, /* syscall */
- { 0xd00, SIGILL }, /* reserved */
- { 0xe00, SIGILL }, /* reserved */
- { 0xf00, SIGILL }, /* reserved */
- /*
- ** 0x1000 PIT
- ** 0x1010 FIT
- ** 0x1020 watchdog
- ** 0x1100 data TLB miss
- ** 0x1200 instruction TLB miss
- */
- { 0x2000, SIGTRAP}, /* debug */
-#else
- { 0x200, SIGSEGV }, /* machine check */
- { 0x300, SIGSEGV }, /* address error (store) */
- { 0x400, SIGBUS }, /* instruction bus error */
- { 0x500, SIGINT }, /* interrupt */
- { 0x600, SIGBUS }, /* alingment */
- { 0x700, SIGTRAP }, /* breakpoint trap */
- { 0x800, SIGFPE }, /* fpu unavail */
- { 0x900, SIGALRM }, /* decrementer */
- { 0xa00, SIGILL }, /* reserved */
- { 0xb00, SIGILL }, /* reserved */
- { 0xc00, SIGCHLD }, /* syscall */
- { 0xd00, SIGTRAP }, /* single-step/watch */
- { 0xe00, SIGFPE }, /* fp assist */
-#endif
- { 0, 0} /* Must be last */
-
-};
-
-static int computeSignal(unsigned int tt)
-{
- struct hard_trap_info *ht;
-
- for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
- if (ht->tt == tt)
- return ht->signo;
-
- return SIGHUP; /* default for things we don't know about */
-}
-
-#define PC_REGNUM 64
-#define SP_REGNUM 1
-
-/*
- * This function does all command processing for interfacing to gdb.
- */
-static int
-handle_exception (struct pt_regs *regs)
-{
- int sigval;
- int addr;
- int length;
- char *ptr;
- unsigned int msr;
-
- /* We don't handle user-mode breakpoints. */
- if (user_mode(regs))
- return 0;
-
- if (debugger_fault_handler) {
- debugger_fault_handler(regs);
- panic("kgdb longjump failed!\n");
- }
- if (kgdb_active) {
- printk(KERN_ERR "interrupt while in kgdb, returning\n");
- return 0;
- }
-
- kgdb_active = 1;
- kgdb_started = 1;
-
-#ifdef KGDB_DEBUG
- printk("kgdb: entering handle_exception; trap [0x%x]\n",
- (unsigned int)regs->trap);
-#endif
-
- kgdb_interruptible(0);
- lock_kernel();
- msr = mfmsr();
- mtmsr(msr & ~MSR_EE); /* disable interrupts */
-
- if (regs->nip == (unsigned long)breakinst) {
- /* Skip over breakpoint trap insn */
- regs->nip += 4;
- }
-
- /* reply to host that an exception has occurred */
- sigval = computeSignal(regs->trap);
- ptr = remcomOutBuffer;
-
-#if defined(CONFIG_40x)
- *ptr++ = 'S';
- *ptr++ = hexchars[sigval >> 4];
- *ptr++ = hexchars[sigval & 0xf];
-#else
- *ptr++ = 'T';
- *ptr++ = hexchars[sigval >> 4];
- *ptr++ = hexchars[sigval & 0xf];
- *ptr++ = hexchars[PC_REGNUM >> 4];
- *ptr++ = hexchars[PC_REGNUM & 0xf];
- *ptr++ = ':';
- ptr = mem2hex((char *)®s->nip, ptr, 4);
- *ptr++ = ';';
- *ptr++ = hexchars[SP_REGNUM >> 4];
- *ptr++ = hexchars[SP_REGNUM & 0xf];
- *ptr++ = ':';
- ptr = mem2hex(((char *)regs) + SP_REGNUM*4, ptr, 4);
- *ptr++ = ';';
-#endif
-
- *ptr++ = 0;
-
- putpacket(remcomOutBuffer);
- if (kdebug)
- printk("remcomOutBuffer: %s\n", remcomOutBuffer);
-
- /* XXX We may want to add some features dealing with poking the
- * XXX page tables, ... (look at sparc-stub.c for more info)
- * XXX also required hacking to the gdb sources directly...
- */
-
- while (1) {
- remcomOutBuffer[0] = 0;
-
- getpacket(remcomInBuffer);
- switch (remcomInBuffer[0]) {
- case '?': /* report most recent signal */
- remcomOutBuffer[0] = 'S';
- remcomOutBuffer[1] = hexchars[sigval >> 4];
- remcomOutBuffer[2] = hexchars[sigval & 0xf];
- remcomOutBuffer[3] = 0;
- break;
-#if 0
- case 'q': /* this screws up gdb for some reason...*/
- {
- extern long _start, sdata, __bss_start;
-
- ptr = &remcomInBuffer[1];
- if (strncmp(ptr, "Offsets", 7) != 0)
- break;
-
- ptr = remcomOutBuffer;
- sprintf(ptr, "Text=%8.8x;Data=%8.8x;Bss=%8.8x",
- &_start, &sdata, &__bss_start);
- break;
- }
-#endif
- case 'd':
- /* toggle debug flag */
- kdebug ^= 1;
- break;
-
- case 'g': /* return the value of the CPU registers.
- * some of them are non-PowerPC names :(
- * they are stored in gdb like:
- * struct {
- * u32 gpr[32];
- * f64 fpr[32];
- * u32 pc, ps, cnd, lr; (ps=msr)
- * u32 cnt, xer, mq;
- * }
- */
- {
- int i;
- ptr = remcomOutBuffer;
- /* General Purpose Regs */
- ptr = mem2hex((char *)regs, ptr, 32 * 4);
- /* Floating Point Regs - FIXME */
- /*ptr = mem2hex((char *), ptr, 32 * 8);*/
- for(i=0; i<(32*8*2); i++) { /* 2chars/byte */
- ptr[i] = '0';
- }
- ptr += 32*8*2;
- /* pc, msr, cr, lr, ctr, xer, (mq is unused) */
- ptr = mem2hex((char *)®s->nip, ptr, 4);
- ptr = mem2hex((char *)®s->msr, ptr, 4);
- ptr = mem2hex((char *)®s->ccr, ptr, 4);
- ptr = mem2hex((char *)®s->link, ptr, 4);
- ptr = mem2hex((char *)®s->ctr, ptr, 4);
- ptr = mem2hex((char *)®s->xer, ptr, 4);
- }
- break;
-
- case 'G': /* set the value of the CPU registers */
- {
- ptr = &remcomInBuffer[1];
-
- /*
- * If the stack pointer has moved, you should pray.
- * (cause only god can help you).
- */
-
- /* General Purpose Regs */
- hex2mem(ptr, (char *)regs, 32 * 4);
-
- /* Floating Point Regs - FIXME?? */
- /*ptr = hex2mem(ptr, ??, 32 * 8);*/
- ptr += 32*8*2;
-
- /* pc, msr, cr, lr, ctr, xer, (mq is unused) */
- ptr = hex2mem(ptr, (char *)®s->nip, 4);
- ptr = hex2mem(ptr, (char *)®s->msr, 4);
- ptr = hex2mem(ptr, (char *)®s->ccr, 4);
- ptr = hex2mem(ptr, (char *)®s->link, 4);
- ptr = hex2mem(ptr, (char *)®s->ctr, 4);
- ptr = hex2mem(ptr, (char *)®s->xer, 4);
-
- strcpy(remcomOutBuffer,"OK");
- }
- break;
- case 'H':
- /* don't do anything, yet, just acknowledge */
- hexToInt(&ptr, &addr);
- strcpy(remcomOutBuffer,"OK");
- break;
-
- case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
- /* Try to read %x,%x. */
-
- ptr = &remcomInBuffer[1];
-
- if (hexToInt(&ptr, &addr) && *ptr++ == ','
- && hexToInt(&ptr, &length)) {
- if (mem2hex((char *)addr, remcomOutBuffer,
- length))
- break;
- strcpy(remcomOutBuffer, "E03");
- } else
- strcpy(remcomOutBuffer, "E01");
- break;
-
- case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */
- /* Try to read '%x,%x:'. */
-
- ptr = &remcomInBuffer[1];
-
- if (hexToInt(&ptr, &addr) && *ptr++ == ','
- && hexToInt(&ptr, &length)
- && *ptr++ == ':') {
- if (hex2mem(ptr, (char *)addr, length))
- strcpy(remcomOutBuffer, "OK");
- else
- strcpy(remcomOutBuffer, "E03");
- flush_icache_range(addr, addr+length);
- } else
- strcpy(remcomOutBuffer, "E02");
- break;
-
-
- case 'k': /* kill the program, actually just continue */
- case 'c': /* cAA..AA Continue; address AA..AA optional */
- /* try to read optional parameter, pc unchanged if no parm */
-
- ptr = &remcomInBuffer[1];
- if (hexToInt(&ptr, &addr))
- regs->nip = addr;
-
-/* Need to flush the instruction cache here, as we may have deposited a
- * breakpoint, and the icache probably has no way of knowing that a data ref to
- * some location may have changed something that is in the instruction cache.
- */
- kgdb_flush_cache_all();
-#if defined(CONFIG_40x)
- strcpy(remcomOutBuffer, "OK");
- putpacket(remcomOutBuffer);
-#endif
- mtmsr(msr);
-
- kgdb_interruptible(1);
- unlock_kernel();
- kgdb_active = 0;
- if (kdebug) {
- printk("remcomInBuffer: %s\n", remcomInBuffer);
- printk("remcomOutBuffer: %s\n", remcomOutBuffer);
- }
- return 1;
-
- case 's':
- kgdb_flush_cache_all();
-#if defined(CONFIG_40x)
- regs->msr |= MSR_DE;
- regs->dbcr0 |= (DBCR0_IDM | DBCR0_IC);
- mtmsr(msr);
-#else
- regs->msr |= MSR_SE;
-#endif
- unlock_kernel();
- kgdb_active = 0;
- if (kdebug) {
- printk("remcomInBuffer: %s\n", remcomInBuffer);
- printk("remcomOutBuffer: %s\n", remcomOutBuffer);
- }
- return 1;
-
- case 'r': /* Reset (if user process..exit ???)*/
- panic("kgdb reset.");
- break;
- } /* switch */
- if (remcomOutBuffer[0] && kdebug) {
- printk("remcomInBuffer: %s\n", remcomInBuffer);
- printk("remcomOutBuffer: %s\n", remcomOutBuffer);
- }
- /* reply to the request */
- putpacket(remcomOutBuffer);
- } /* while(1) */
-}
-
-/* This function will generate a breakpoint exception. It is used at the
- beginning of a program to sync up with a debugger and can be used
- otherwise as a quick means to stop program execution and "break" into
- the debugger. */
-
-void
-breakpoint(void)
-{
- if (!initialized) {
- printk("breakpoint() called b4 kgdb init\n");
- return;
- }
-
- asm(" .globl breakinst \n\
- breakinst: .long 0x7d821008");
-}
-
-#ifdef CONFIG_KGDB_CONSOLE
-/* Output string in GDB O-packet format if GDB has connected. If nothing
- output, returns 0 (caller must then handle output). */
-int
-kgdb_output_string (const char* s, unsigned int count)
-{
- char buffer[512];
-
- if (!kgdb_started)
- return 0;
-
- count = (count <= (sizeof(buffer) / 2 - 2))
- ? count : (sizeof(buffer) / 2 - 2);
-
- buffer[0] = 'O';
- mem2hex (s, &buffer[1], count);
- putpacket(buffer);
-
- return 1;
-}
-#endif
-
-static void sysrq_handle_gdb(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
-{
- printk("Entering GDB stub\n");
- breakpoint();
-}
-static struct sysrq_key_op sysrq_gdb_op = {
- .handler = sysrq_handle_gdb,
- .help_msg = "Gdb",
- .action_msg = "GDB",
-};
-
-static int gdb_register_sysrq(void)
-{
- printk("Registering GDB sysrq handler\n");
- register_sysrq_key('g', &sysrq_gdb_op);
- return 0;
-}
-module_init(gdb_register_sysrq);
diff -puN arch/ppc/kernel/setup.c~ppc-lite arch/ppc/kernel/setup.c
--- linux-2.6.10-rc1/arch/ppc/kernel/setup.c~ppc-lite 2004-10-29 11:26:44.713389678 -0700
+++ linux-2.6.10-rc1-trini/arch/ppc/kernel/setup.c 2004-10-29 11:26:44.733384983 -0700
@@ -40,10 +40,6 @@
#include <asm/xmon.h>
#include <asm/ocp.h>
-#if defined CONFIG_KGDB
-#include <asm/kgdb.h>
-#endif
-
extern void platform_init(unsigned long r3, unsigned long r4,
unsigned long r5, unsigned long r6, unsigned long r7);
extern void bootx_init(unsigned long r4, unsigned long phys);
@@ -699,18 +695,6 @@ void __init setup_arch(char **cmdline_p)
#endif /* CONFIG_XMON */
if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);
-#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)
diff -puN arch/ppc/platforms/sandpoint.c~ppc-lite arch/ppc/platforms/sandpoint.c
--- linux-2.6.10-rc1/arch/ppc/platforms/sandpoint.c~ppc-lite 2004-10-29 11:26:44.715389209 -0700
+++ linux-2.6.10-rc1-trini/arch/ppc/platforms/sandpoint.c 2004-10-29 11:26:44.733384983 -0700
@@ -252,8 +252,7 @@ sandpoint_find_bridges(void)
return;
}
-#if defined(CONFIG_SERIAL_8250) && \
- (defined(CONFIG_KGDB) || defined(CONFIG_SERIAL_TEXT_DEBUG))
+#if defined(CONFIG_SERIAL_8250) && defined(CONFIG_SERIAL_TEXT_DEBUG)
static void __init
sandpoint_early_serial_map(void)
{
@@ -689,16 +688,10 @@ platform_init(unsigned long r3, unsigned
ppc_md.nvram_read_val = todc_mc146818_read_val;
ppc_md.nvram_write_val = todc_mc146818_write_val;
-#if defined(CONFIG_SERIAL_8250) && \
- (defined(CONFIG_KGDB) || defined(CONFIG_SERIAL_TEXT_DEBUG))
+#if defined(CONFIG_SERIAL_8250) && defined(CONFIG_SERIAL_TEXT_DEBUG)
sandpoint_early_serial_map();
-#ifdef CONFIG_KGDB
- ppc_md.kgdb_map_scc = gen550_kgdb_map_scc;
-#endif
-#ifdef CONFIG_SERIAL_TEXT_DEBUG
ppc_md.progress = gen550_progress;
#endif
-#endif
#if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
ppc_ide_md.default_irq = sandpoint_ide_default_irq;
diff -puN arch/ppc/syslib/Makefile~ppc-lite arch/ppc/syslib/Makefile
--- linux-2.6.10-rc1/arch/ppc/syslib/Makefile~ppc-lite 2004-10-29 11:26:44.716388974 -0700
+++ linux-2.6.10-rc1-trini/arch/ppc/syslib/Makefile 2004-10-29 11:26:44.734384749 -0700
@@ -25,7 +25,6 @@ obj-$(CONFIG_GEN_RTC) += todc_time.o
obj-$(CONFIG_PPC4xx_DMA) += ppc4xx_dma.o
obj-$(CONFIG_PPC4xx_EDMA) += ppc4xx_sgdma.o
ifeq ($(CONFIG_40x),y)
-obj-$(CONFIG_KGDB) += ppc4xx_kgdb.o
obj-$(CONFIG_PCI) += indirect_pci.o pci_auto.o ppc405_pci.o
endif
endif
@@ -72,7 +71,6 @@ obj-$(CONFIG_PCI_8260) += m8260_pci.o i
obj-$(CONFIG_8260_PCI9) += m8260_pci_erratum9.o
obj-$(CONFIG_CPM2) += cpm2_common.o cpm2_pic.o
ifeq ($(CONFIG_PPC_GEN550),y)
-obj-$(CONFIG_KGDB) += gen550_kgdb.o gen550_dbg.o
obj-$(CONFIG_SERIAL_TEXT_DEBUG) += gen550_dbg.o
endif
obj-$(CONFIG_BOOTX_TEXT) += btext.o
diff -L arch/ppc/syslib/gen550_kgdb.c -puN arch/ppc/syslib/gen550_kgdb.c~ppc-lite /dev/null
--- linux-2.6.10-rc1/arch/ppc/syslib/gen550_kgdb.c
+++ /dev/null 2004-10-25 00:35:20.587727328 -0700
@@ -1,86 +0,0 @@
-/*
- * arch/ppc/syslib/gen550_kgdb.c
- *
- * Generic 16550 kgdb support intended to be useful on a variety
- * of platforms. To enable this support, it is necessary to set
- * the CONFIG_GEN550 option. Any virtual mapping of the serial
- * port(s) to be used can be accomplished by setting
- * ppc_md.early_serial_map to a platform-specific mapping function.
- *
- * Adapted from ppc4xx_kgdb.c.
- *
- * Author: Matt Porter <mporter@xxxxxxxxxxxxxxxxxxx>
- *
- * 2002-2004 (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.
- */
-
-#include <linux/config.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-
-#include <asm/machdep.h>
-
-extern unsigned long serial_init(int, void *);
-extern unsigned long serial_getc(unsigned long);
-extern unsigned long serial_putc(unsigned long, unsigned char);
-
-#if defined(CONFIG_KGDB_TTYS0)
-#define KGDB_PORT 0
-#elif defined(CONFIG_KGDB_TTYS1)
-#define KGDB_PORT 1
-#elif defined(CONFIG_KGDB_TTYS2)
-#define KGDB_PORT 2
-#elif defined(CONFIG_KGDB_TTYS3)
-#define KGDB_PORT 3
-#else
-#error "invalid kgdb_tty port"
-#endif
-
-static volatile unsigned int kgdb_debugport;
-
-void putDebugChar(unsigned char c)
-{
- if (kgdb_debugport == 0)
- kgdb_debugport = serial_init(KGDB_PORT, NULL);
-
- serial_putc(kgdb_debugport, c);
-}
-
-int getDebugChar(void)
-{
- if (kgdb_debugport == 0)
- kgdb_debugport = serial_init(KGDB_PORT, NULL);
-
- return(serial_getc(kgdb_debugport));
-}
-
-void kgdb_interruptible(int enable)
-{
- return;
-}
-
-void putDebugString(char* str)
-{
- while (*str != '\0') {
- putDebugChar(*str);
- str++;
- }
- putDebugChar('\r');
- return;
-}
-
-/*
- * Note: gen550_init() must be called already on the port we are going
- * to use.
- */
-void
-gen550_kgdb_map_scc(void)
-{
- printk(KERN_DEBUG "kgdb init\n");
- if (ppc_md.early_serial_map)
- ppc_md.early_serial_map();
- kgdb_debugport = serial_init(KGDB_PORT, NULL);
-}
diff -L arch/ppc/syslib/ppc4xx_kgdb.c -puN arch/ppc/syslib/ppc4xx_kgdb.c~ppc-lite /dev/null
--- linux-2.6.10-rc1/arch/ppc/syslib/ppc4xx_kgdb.c
+++ /dev/null 2004-10-25 00:35:20.587727328 -0700
@@ -1,124 +0,0 @@
-#include <linux/config.h>
-#include <linux/types.h>
-#include <asm/ibm4xx.h>
-#include <linux/kernel.h>
-
-
-
-#define LSR_DR 0x01 /* Data ready */
-#define LSR_OE 0x02 /* Overrun */
-#define LSR_PE 0x04 /* Parity error */
-#define LSR_FE 0x08 /* Framing error */
-#define LSR_BI 0x10 /* Break */
-#define LSR_THRE 0x20 /* Xmit holding register empty */
-#define LSR_TEMT 0x40 /* Xmitter empty */
-#define LSR_ERR 0x80 /* Error */
-
-#include <platforms/4xx/ibm_ocp.h>
-
-extern struct NS16550* COM_PORTS[];
-#ifndef NULL
-#define NULL 0x00
-#endif
-
-static volatile struct NS16550 *kgdb_debugport = NULL;
-
-volatile struct NS16550 *
-NS16550_init(int chan)
-{
- volatile struct NS16550 *com_port;
- int quot;
-#ifdef BASE_BAUD
- quot = BASE_BAUD / 9600;
-#else
- quot = 0x000c; /* 0xc = 9600 baud (on a pc) */
-#endif
-
- com_port = (struct NS16550 *) COM_PORTS[chan];
-
- com_port->lcr = 0x00;
- com_port->ier = 0xFF;
- com_port->ier = 0x00;
- com_port->lcr = com_port->lcr | 0x80; /* Access baud rate */
- com_port->dll = ( quot & 0x00ff ); /* 0xc = 9600 baud */
- com_port->dlm = ( quot & 0xff00 ) >> 8;
- com_port->lcr = 0x03; /* 8 data, 1 stop, no parity */
- com_port->mcr = 0x00; /* RTS/DTR */
- com_port->fcr = 0x07; /* Clear & enable FIFOs */
-
- return( com_port );
-}
-
-
-void
-NS16550_putc(volatile struct NS16550 *com_port, unsigned char c)
-{
- while ((com_port->lsr & LSR_THRE) == 0)
- ;
- com_port->thr = c;
- return;
-}
-
-unsigned char
-NS16550_getc(volatile struct NS16550 *com_port)
-{
- while ((com_port->lsr & LSR_DR) == 0)
- ;
- return (com_port->rbr);
-}
-
-unsigned char
-NS16550_tstc(volatile struct NS16550 *com_port)
-{
- return ((com_port->lsr & LSR_DR) != 0);
-}
-
-
-#if defined(CONFIG_KGDB_TTYS0)
-#define KGDB_PORT 0
-#elif defined(CONFIG_KGDB_TTYS1)
-#define KGDB_PORT 1
-#elif defined(CONFIG_KGDB_TTYS2)
-#define KGDB_PORT 2
-#elif defined(CONFIG_KGDB_TTYS3)
-#define KGDB_PORT 3
-#else
-#error "invalid kgdb_tty port"
-#endif
-
-void putDebugChar( unsigned char c )
-{
- if ( kgdb_debugport == NULL )
- kgdb_debugport = NS16550_init(KGDB_PORT);
- NS16550_putc( kgdb_debugport, c );
-}
-
-int getDebugChar( void )
-{
- if (kgdb_debugport == NULL)
- kgdb_debugport = NS16550_init(KGDB_PORT);
-
- return(NS16550_getc(kgdb_debugport));
-}
-
-void kgdb_interruptible(int enable)
-{
- return;
-}
-
-void putDebugString(char* str)
-{
- while (*str != '\0') {
- putDebugChar(*str);
- str++;
- }
- putDebugChar('\r');
- return;
-}
-
-void
-kgdb_map_scc(void)
-{
- printk("kgdb init \n");
- kgdb_debugport = NS16550_init(KGDB_PORT);
-}
diff -puN arch/ppc/syslib/ppc4xx_serial.c~ppc-lite arch/ppc/syslib/ppc4xx_serial.c
--- linux-2.6.10-rc1/arch/ppc/syslib/ppc4xx_serial.c~ppc-lite 2004-10-29 11:26:44.722387566 -0700
+++ linux-2.6.10-rc1-trini/arch/ppc/syslib/ppc4xx_serial.c 2004-10-29 11:26:44.734384749 -0700
@@ -20,11 +20,6 @@
#if defined(CONFIG_IBM405GP) || defined(CONFIG_IBM405CR)
-#ifdef CONFIG_KGDB
-#include <asm/kgdb.h>
-#include <linux/init.h>
-#endif
-
#ifdef CONFIG_DEBUG_BRINGUP
#include <linux/console.h>
diff -puN include/asm-ppc/kgdb.h~ppc-lite include/asm-ppc/kgdb.h
--- linux-2.6.10-rc1/include/asm-ppc/kgdb.h~ppc-lite 2004-10-29 11:26:44.723387331 -0700
+++ linux-2.6.10-rc1-trini/include/asm-ppc/kgdb.h 2004-10-29 11:26:44.735384514 -0700
@@ -2,6 +2,8 @@
* kgdb.h: Defines and declarations for serial line source level
* remote debugging of the Linux kernel using gdb.
*
+ * PPC Mods (C) 2004 Tom Rini (trini@xxxxxxxxxx)
+ * PPC Mods (C) 2003 John Whitney (john.whitney@xxxxxxxxxxx)
* PPC Mods (C) 1998 Michael Tesch (tesch@xxxxxxxxxxx)
*
* Copyright (C) 1995 David S. Miller (davem@xxxxxxxxxxxxxxxx)
@@ -12,6 +14,15 @@
#ifndef __ASSEMBLY__
+#define BREAK_INSTR_SIZE 4
+#define MAXREG (PT_FPSCR+1)
+#define NUMREGBYTES (MAXREG * sizeof(int))
+#define BUFMAX ((NUMREGBYTES * 2) + 512)
+#define OUTBUFMAX ((NUMREGBYTES * 2) + 512)
+#define BREAKPOINT() asm(".long 0x7d821008"); /* twge r2, r2 */
+
+#define CHECK_EXCEPTION_STACK() 1
+
/* Things specific to the gen550 backend. */
struct uart_port;
@@ -19,15 +30,6 @@ extern void gen550_progress(char *, unsi
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
*/
diff -puN lib/Kconfig.debug~ppc-lite lib/Kconfig.debug
--- linux-2.6.10-rc1/lib/Kconfig.debug~ppc-lite 2004-10-29 11:26:44.725386861 -0700
+++ linux-2.6.10-rc1-trini/lib/Kconfig.debug 2004-10-29 11:32:57.778768052 -0700
@@ -115,7 +115,7 @@ endif
config KGDB
bool "KGDB: kernel debugging with remote gdb"
- depends on DEBUG_KERNEL && (X86)
+ depends on DEBUG_KERNEL && (X86 || ((!SMP || BROKEN) && (PPC32)))
help
If you say Y here, it will be possible to remotely debug the
kernel using gdb. This enlarges your kernel image disk size by
_
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