[patch 5/8] KGDB support for MIPS

From: Tom Rini
Date: Fri Oct 29 2004 - 14:17:43 EST


Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>, Manish Lachwani <mlachwani@xxxxxxxxxx>
This adds KGDB support for MIPS and was done by Manish Lachwani. This has
been tested on MIPS Malta and Sibyte 1250 SWARM (32 & 64).

---

linux-2.6.10-rc1-trini/arch/mips/Kconfig.debug | 19
linux-2.6.10-rc1-trini/arch/mips/kernel/Makefile | 2
linux-2.6.10-rc1-trini/arch/mips/kernel/irq.c | 3
linux-2.6.10-rc1-trini/arch/mips/kernel/kgdb.c | 292 ++
linux-2.6.10-rc1-trini/arch/mips/kernel/kgdb_handler.S | 58
linux-2.6.10-rc1-trini/arch/mips/kernel/traps.c | 29
linux-2.6.10-rc1-trini/arch/mips/mips-boards/generic/Makefile | 1
linux-2.6.10-rc1-trini/arch/mips/mips-boards/generic/init.c | 64
linux-2.6.10-rc1-trini/arch/mips/mips-boards/malta/malta_int.c | 25
linux-2.6.10-rc1-trini/arch/mips/mips-boards/malta/malta_setup.c | 8
linux-2.6.10-rc1-trini/arch/mips/sibyte/cfe/setup.c | 14
linux-2.6.10-rc1-trini/arch/mips/sibyte/sb1250/Makefile | 1
linux-2.6.10-rc1-trini/arch/mips/sibyte/sb1250/irq.c | 72
linux-2.6.10-rc1-trini/arch/mips/sibyte/sb1250/kgdb_sibyte.c | 158 +
linux-2.6.10-rc1-trini/arch/mips/sibyte/swarm/Makefile | 2
linux-2.6.10-rc1-trini/include/asm-mips/kdebug.h | 47
linux-2.6.10-rc1-trini/include/asm-mips/kgdb.h | 20
linux-2.6.10-rc1-trini/lib/Kconfig.debug | 9
linux-2.6.10-rc1/arch/mips/kernel/gdb-low.S | 370 ---
linux-2.6.10-rc1/arch/mips/kernel/gdb-stub.c | 1089 ----------
linux-2.6.10-rc1/arch/mips/sibyte/swarm/dbg_io.c | 76
21 files changed, 633 insertions(+), 1726 deletions(-)

diff -puN arch/mips/Kconfig.debug~mips-lite arch/mips/Kconfig.debug
--- linux-2.6.10-rc1/arch/mips/Kconfig.debug~mips-lite 2004-10-29 11:26:45.172281931 -0700
+++ linux-2.6.10-rc1-trini/arch/mips/Kconfig.debug 2004-10-29 11:26:45.204274419 -0700
@@ -27,25 +27,6 @@ config DEBUG_STACK_USAGE

This option will slow down process creation somewhat.

-config KGDB
- bool "Remote GDB kernel debugging"
- depends on DEBUG_KERNEL
- select DEBUG_INFO
- help
- If you say Y here, it will be possible to remotely debug the MIPS
- kernel using gdb. This enlarges your kernel image disk size by
- several megabytes and requires a machine with more than 16 MB,
- better 32 MB RAM to avoid excessive linking time. This is only
- useful for kernel hackers. If unsure, say N.
-
-config GDB_CONSOLE
- bool "Console output to GDB"
- depends on KGDB
- help
- If you are using GDB for remote debugging over a serial port and
- would like kernel messages to be formatted into GDB $O packets so
- that GDB prints them as program output, say 'Y'.
-
config SB1XXX_CORELIS
bool "Corelis Debugger"
depends on SIBYTE_SB1xxx_SOC
diff -puN arch/mips/kernel/Makefile~mips-lite arch/mips/kernel/Makefile
--- linux-2.6.10-rc1/arch/mips/kernel/Makefile~mips-lite 2004-10-29 11:26:45.173281696 -0700
+++ linux-2.6.10-rc1-trini/arch/mips/kernel/Makefile 2004-10-29 11:26:45.204274419 -0700
@@ -48,7 +48,7 @@ obj-$(CONFIG_MIPS32_COMPAT) += ioctl32.o
obj-$(CONFIG_MIPS32_N32) += binfmt_elfn32.o scall64-n32.o signal_n32.o
obj-$(CONFIG_MIPS32_O32) += binfmt_elfo32.o scall64-o32.o ptrace32.o

-obj-$(CONFIG_KGDB) += gdb-low.o gdb-stub.o
+obj-$(CONFIG_KGDB) += kgdb_handler.o kgdb.o
obj-$(CONFIG_PROC_FS) += proc.o

obj-$(CONFIG_MIPS64) += cpu-bugs64.o
diff -L arch/mips/kernel/gdb-low.S -puN arch/mips/kernel/gdb-low.S~mips-lite /dev/null
--- linux-2.6.10-rc1/arch/mips/kernel/gdb-low.S
+++ /dev/null 2004-10-25 00:35:20.587727328 -0700
@@ -1,370 +0,0 @@
-/*
- * gdb-low.S contains the low-level trap handler for the GDB stub.
- *
- * Copyright (C) 1995 Andreas Busse
- */
-#include <linux/config.h>
-#include <linux/sys.h>
-
-#include <asm/asm.h>
-#include <asm/errno.h>
-#include <asm/mipsregs.h>
-#include <asm/regdef.h>
-#include <asm/stackframe.h>
-#include <asm/gdb-stub.h>
-
-#ifdef CONFIG_MIPS32
-#define DMFC0 mfc0
-#define DMTC0 mtc0
-#define LDC1 lwc1
-#define SDC1 lwc1
-#endif
-#ifdef CONFIG_MIPS64
-#define DMFC0 dmfc0
-#define DMTC0 dmtc0
-#define LDC1 ldc1
-#define SDC1 ldc1
-#endif
-
-/*
- * [jsun] We reserves about 2x GDB_FR_SIZE in stack. The lower (addressed)
- * part is used to store registers and passed to exception handler.
- * The upper part is reserved for "call func" feature where gdb client
- * saves some of the regs, setups call frame and passes args.
- *
- * A trace shows about 200 bytes are used to store about half of all regs.
- * The rest should be big enough for frame setup and passing args.
- */
-
-/*
- * The low level trap handler
- */
- .align 5
- NESTED(trap_low, GDB_FR_SIZE, sp)
- .set noat
- .set noreorder
-
- mfc0 k0, CP0_STATUS
- sll k0, 3 /* extract cu0 bit */
- bltz k0, 1f
- move k1, sp
-
- /*
- * Called from user mode, go somewhere else.
- */
- lui k1, %hi(saved_vectors)
- mfc0 k0, CP0_CAUSE
- andi k0, k0, 0x7c
- add k1, k1, k0
- lw k0, %lo(saved_vectors)(k1)
- jr k0
- nop
-1:
- move k0, sp
- subu sp, k1, GDB_FR_SIZE*2 # see comment above
- LONG_S k0, GDB_FR_REG29(sp)
- LONG_S $2, GDB_FR_REG2(sp)
-
-/*
- * First save the CP0 and special registers
- */
-
- mfc0 v0, CP0_STATUS
- LONG_S v0, GDB_FR_STATUS(sp)
- mfc0 v0, CP0_CAUSE
- LONG_S v0, GDB_FR_CAUSE(sp)
- DMFC0 v0, CP0_EPC
- LONG_S v0, GDB_FR_EPC(sp)
- DMFC0 v0, CP0_BADVADDR
- LONG_S v0, GDB_FR_BADVADDR(sp)
- mfhi v0
- LONG_S v0, GDB_FR_HI(sp)
- mflo v0
- LONG_S v0, GDB_FR_LO(sp)
-
-/*
- * Now the integer registers
- */
-
- LONG_S zero, GDB_FR_REG0(sp) /* I know... */
- LONG_S $1, GDB_FR_REG1(sp)
- /* v0 already saved */
- LONG_S $3, GDB_FR_REG3(sp)
- LONG_S $4, GDB_FR_REG4(sp)
- LONG_S $5, GDB_FR_REG5(sp)
- LONG_S $6, GDB_FR_REG6(sp)
- LONG_S $7, GDB_FR_REG7(sp)
- LONG_S $8, GDB_FR_REG8(sp)
- LONG_S $9, GDB_FR_REG9(sp)
- LONG_S $10, GDB_FR_REG10(sp)
- LONG_S $11, GDB_FR_REG11(sp)
- LONG_S $12, GDB_FR_REG12(sp)
- LONG_S $13, GDB_FR_REG13(sp)
- LONG_S $14, GDB_FR_REG14(sp)
- LONG_S $15, GDB_FR_REG15(sp)
- LONG_S $16, GDB_FR_REG16(sp)
- LONG_S $17, GDB_FR_REG17(sp)
- LONG_S $18, GDB_FR_REG18(sp)
- LONG_S $19, GDB_FR_REG19(sp)
- LONG_S $20, GDB_FR_REG20(sp)
- LONG_S $21, GDB_FR_REG21(sp)
- LONG_S $22, GDB_FR_REG22(sp)
- LONG_S $23, GDB_FR_REG23(sp)
- LONG_S $24, GDB_FR_REG24(sp)
- LONG_S $25, GDB_FR_REG25(sp)
- LONG_S $26, GDB_FR_REG26(sp)
- LONG_S $27, GDB_FR_REG27(sp)
- LONG_S $28, GDB_FR_REG28(sp)
- /* sp already saved */
- LONG_S $30, GDB_FR_REG30(sp)
- LONG_S $31, GDB_FR_REG31(sp)
-
- CLI /* disable interrupts */
-
-/*
- * Followed by the floating point registers
- */
- mfc0 v0, CP0_STATUS /* FPU enabled? */
- srl v0, v0, 16
- andi v0, v0, (ST0_CU1 >> 16)
-
- beqz v0,2f /* disabled, skip */
- nop
-
- SDC1 $0, GDB_FR_FPR0(sp)
- SDC1 $1, GDB_FR_FPR1(sp)
- SDC1 $2, GDB_FR_FPR2(sp)
- SDC1 $3, GDB_FR_FPR3(sp)
- SDC1 $4, GDB_FR_FPR4(sp)
- SDC1 $5, GDB_FR_FPR5(sp)
- SDC1 $6, GDB_FR_FPR6(sp)
- SDC1 $7, GDB_FR_FPR7(sp)
- SDC1 $8, GDB_FR_FPR8(sp)
- SDC1 $9, GDB_FR_FPR9(sp)
- SDC1 $10, GDB_FR_FPR10(sp)
- SDC1 $11, GDB_FR_FPR11(sp)
- SDC1 $12, GDB_FR_FPR12(sp)
- SDC1 $13, GDB_FR_FPR13(sp)
- SDC1 $14, GDB_FR_FPR14(sp)
- SDC1 $15, GDB_FR_FPR15(sp)
- SDC1 $16, GDB_FR_FPR16(sp)
- SDC1 $17, GDB_FR_FPR17(sp)
- SDC1 $18, GDB_FR_FPR18(sp)
- SDC1 $19, GDB_FR_FPR19(sp)
- SDC1 $20, GDB_FR_FPR20(sp)
- SDC1 $21, GDB_FR_FPR21(sp)
- SDC1 $22, GDB_FR_FPR22(sp)
- SDC1 $23, GDB_FR_FPR23(sp)
- SDC1 $24, GDB_FR_FPR24(sp)
- SDC1 $25, GDB_FR_FPR25(sp)
- SDC1 $26, GDB_FR_FPR26(sp)
- SDC1 $27, GDB_FR_FPR27(sp)
- SDC1 $28, GDB_FR_FPR28(sp)
- SDC1 $29, GDB_FR_FPR29(sp)
- SDC1 $30, GDB_FR_FPR30(sp)
- SDC1 $31, GDB_FR_FPR31(sp)
-
-/*
- * FPU control registers
- */
-
- cfc1 v0, CP1_STATUS
- LONG_S v0, GDB_FR_FSR(sp)
- cfc1 v0, CP1_REVISION
- LONG_S v0, GDB_FR_FIR(sp)
-
-/*
- * Current stack frame ptr
- */
-
-2:
- LONG_S sp, GDB_FR_FRP(sp)
-
-/*
- * CP0 registers (R4000/R4400 unused registers skipped)
- */
-
- mfc0 v0, CP0_INDEX
- LONG_S v0, GDB_FR_CP0_INDEX(sp)
- mfc0 v0, CP0_RANDOM
- LONG_S v0, GDB_FR_CP0_RANDOM(sp)
- DMFC0 v0, CP0_ENTRYLO0
- LONG_S v0, GDB_FR_CP0_ENTRYLO0(sp)
- DMFC0 v0, CP0_ENTRYLO1
- LONG_S v0, GDB_FR_CP0_ENTRYLO1(sp)
- DMFC0 v0, CP0_CONTEXT
- LONG_S v0, GDB_FR_CP0_CONTEXT(sp)
- mfc0 v0, CP0_PAGEMASK
- LONG_S v0, GDB_FR_CP0_PAGEMASK(sp)
- mfc0 v0, CP0_WIRED
- LONG_S v0, GDB_FR_CP0_WIRED(sp)
- DMFC0 v0, CP0_ENTRYHI
- LONG_S v0, GDB_FR_CP0_ENTRYHI(sp)
- mfc0 v0, CP0_PRID
- LONG_S v0, GDB_FR_CP0_PRID(sp)
-
- .set at
-
-/*
- * Continue with the higher level handler
- */
-
- move a0,sp
-
- jal handle_exception
- nop
-
-/*
- * Restore all writable registers, in reverse order
- */
-
- .set noat
-
- LONG_L v0, GDB_FR_CP0_ENTRYHI(sp)
- LONG_L v1, GDB_FR_CP0_WIRED(sp)
- DMTC0 v0, CP0_ENTRYHI
- mtc0 v1, CP0_WIRED
- LONG_L v0, GDB_FR_CP0_PAGEMASK(sp)
- LONG_L v1, GDB_FR_CP0_ENTRYLO1(sp)
- mtc0 v0, CP0_PAGEMASK
- DMTC0 v1, CP0_ENTRYLO1
- LONG_L v0, GDB_FR_CP0_ENTRYLO0(sp)
- LONG_L v1, GDB_FR_CP0_INDEX(sp)
- DMTC0 v0, CP0_ENTRYLO0
- LONG_L v0, GDB_FR_CP0_CONTEXT(sp)
- mtc0 v1, CP0_INDEX
- DMTC0 v0, CP0_CONTEXT
-
-
-/*
- * Next, the floating point registers
- */
- mfc0 v0, CP0_STATUS /* check if the FPU is enabled */
- srl v0, v0, 16
- andi v0, v0, (ST0_CU1 >> 16)
-
- beqz v0, 3f /* disabled, skip */
- nop
-
- LDC1 $31, GDB_FR_FPR31(sp)
- LDC1 $30, GDB_FR_FPR30(sp)
- LDC1 $29, GDB_FR_FPR29(sp)
- LDC1 $28, GDB_FR_FPR28(sp)
- LDC1 $27, GDB_FR_FPR27(sp)
- LDC1 $26, GDB_FR_FPR26(sp)
- LDC1 $25, GDB_FR_FPR25(sp)
- LDC1 $24, GDB_FR_FPR24(sp)
- LDC1 $23, GDB_FR_FPR23(sp)
- LDC1 $22, GDB_FR_FPR22(sp)
- LDC1 $21, GDB_FR_FPR21(sp)
- LDC1 $20, GDB_FR_FPR20(sp)
- LDC1 $19, GDB_FR_FPR19(sp)
- LDC1 $18, GDB_FR_FPR18(sp)
- LDC1 $17, GDB_FR_FPR17(sp)
- LDC1 $16, GDB_FR_FPR16(sp)
- LDC1 $15, GDB_FR_FPR15(sp)
- LDC1 $14, GDB_FR_FPR14(sp)
- LDC1 $13, GDB_FR_FPR13(sp)
- LDC1 $12, GDB_FR_FPR12(sp)
- LDC1 $11, GDB_FR_FPR11(sp)
- LDC1 $10, GDB_FR_FPR10(sp)
- LDC1 $9, GDB_FR_FPR9(sp)
- LDC1 $8, GDB_FR_FPR8(sp)
- LDC1 $7, GDB_FR_FPR7(sp)
- LDC1 $6, GDB_FR_FPR6(sp)
- LDC1 $5, GDB_FR_FPR5(sp)
- LDC1 $4, GDB_FR_FPR4(sp)
- LDC1 $3, GDB_FR_FPR3(sp)
- LDC1 $2, GDB_FR_FPR2(sp)
- LDC1 $1, GDB_FR_FPR1(sp)
- LDC1 $0, GDB_FR_FPR0(sp)
-
-/*
- * Now the CP0 and integer registers
- */
-
-3:
- mfc0 t0, CP0_STATUS
- ori t0, 0x1f
- xori t0, 0x1f
- mtc0 t0, CP0_STATUS
-
- LONG_L v0, GDB_FR_STATUS(sp)
- LONG_L v1, GDB_FR_EPC(sp)
- mtc0 v0, CP0_STATUS
- DMTC0 v1, CP0_EPC
- LONG_L v0, GDB_FR_HI(sp)
- LONG_L v1, GDB_FR_LO(sp)
- mthi v0
- mtlo v1
- LONG_L $31, GDB_FR_REG31(sp)
- LONG_L $30, GDB_FR_REG30(sp)
- LONG_L $28, GDB_FR_REG28(sp)
- LONG_L $27, GDB_FR_REG27(sp)
- LONG_L $26, GDB_FR_REG26(sp)
- LONG_L $25, GDB_FR_REG25(sp)
- LONG_L $24, GDB_FR_REG24(sp)
- LONG_L $23, GDB_FR_REG23(sp)
- LONG_L $22, GDB_FR_REG22(sp)
- LONG_L $21, GDB_FR_REG21(sp)
- LONG_L $20, GDB_FR_REG20(sp)
- LONG_L $19, GDB_FR_REG19(sp)
- LONG_L $18, GDB_FR_REG18(sp)
- LONG_L $17, GDB_FR_REG17(sp)
- LONG_L $16, GDB_FR_REG16(sp)
- LONG_L $15, GDB_FR_REG15(sp)
- LONG_L $14, GDB_FR_REG14(sp)
- LONG_L $13, GDB_FR_REG13(sp)
- LONG_L $12, GDB_FR_REG12(sp)
- LONG_L $11, GDB_FR_REG11(sp)
- LONG_L $10, GDB_FR_REG10(sp)
- LONG_L $9, GDB_FR_REG9(sp)
- LONG_L $8, GDB_FR_REG8(sp)
- LONG_L $7, GDB_FR_REG7(sp)
- LONG_L $6, GDB_FR_REG6(sp)
- LONG_L $5, GDB_FR_REG5(sp)
- LONG_L $4, GDB_FR_REG4(sp)
- LONG_L $3, GDB_FR_REG3(sp)
- LONG_L $2, GDB_FR_REG2(sp)
- LONG_L $1, GDB_FR_REG1(sp)
-#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
- LONG_L k0, GDB_FR_EPC(sp)
- LONG_L $29, GDB_FR_REG29(sp) /* Deallocate stack */
- jr k0
- rfe
-#else
- LONG_L sp, GDB_FR_REG29(sp) /* Deallocate stack */
-
- .set mips3
- eret
- .set mips0
-#endif
- .set at
- .set reorder
- END(trap_low)
-
-LEAF(kgdb_read_byte)
-4: lb t0, (a0)
- sb t0, (a1)
- li v0, 0
- jr ra
- .section __ex_table,"a"
- PTR 4b, kgdbfault
- .previous
- END(kgdb_read_byte)
-
-LEAF(kgdb_write_byte)
-5: sb a0, (a1)
- li v0, 0
- jr ra
- .section __ex_table,"a"
- PTR 5b, kgdbfault
- .previous
- END(kgdb_write_byte)
-
- .type kgdbfault@function
- .ent kgdbfault
-
-kgdbfault: li v0, -EFAULT
- jr ra
- .end kgdbfault
diff -L arch/mips/kernel/gdb-stub.c -puN arch/mips/kernel/gdb-stub.c~mips-lite /dev/null
--- linux-2.6.10-rc1/arch/mips/kernel/gdb-stub.c
+++ /dev/null 2004-10-25 00:35:20.587727328 -0700
@@ -1,1089 +0,0 @@
-/*
- * arch/mips/kernel/gdb-stub.c
- *
- * Originally written by Glenn Engel, Lake Stevens Instrument Division
- *
- * Contributed by HP Systems
- *
- * Modified for SPARC by Stu Grossman, Cygnus Support.
- *
- * Modified for Linux/MIPS (and MIPS in general) by Andreas Busse
- * Send complaints, suggestions etc. to <andy@xxxxxxxxxxxxxxx>
- *
- * Copyright (C) 1995 Andreas Busse
- *
- * Copyright (C) 2003 MontaVista Software Inc.
- * Author: Jun Sun, jsun@xxxxxxxxxx or jsun@xxxxxxxxxx
- */
-
-/*
- * 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 BREAK instruction.
- *
- *
- * 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
- *
- * 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
- *
- *
- * ==============
- * MORE EXAMPLES:
- * ==============
- *
- * For reference -- the following are the steps that one
- * company took (RidgeRun Inc) to get remote gdb debugging
- * going. In this scenario the host machine was a PC and the
- * target platform was a Galileo EVB64120A MIPS evaluation
- * board.
- *
- * Step 1:
- * First download gdb-5.0.tar.gz from the internet.
- * and then build/install the package.
- *
- * Example:
- * $ tar zxf gdb-5.0.tar.gz
- * $ cd gdb-5.0
- * $ ./configure --target=mips-linux-elf
- * $ make
- * $ install
- * $ which mips-linux-elf-gdb
- * /usr/local/bin/mips-linux-elf-gdb
- *
- * Step 2:
- * Configure linux for remote debugging and build it.
- *
- * Example:
- * $ cd ~/linux
- * $ make menuconfig <go to "Kernel Hacking" and turn on remote debugging>
- * $ make
- *
- * Step 3:
- * Download the kernel to the remote target and start
- * the kernel running. It will promptly halt and wait
- * for the host gdb session to connect. It does this
- * since the "Kernel Hacking" option has defined
- * CONFIG_KGDB which in turn enables your calls
- * to:
- * set_debug_traps();
- * breakpoint();
- *
- * Step 4:
- * Start the gdb session on the host.
- *
- * Example:
- * $ mips-linux-elf-gdb vmlinux
- * (gdb) set remotebaud 115200
- * (gdb) target remote /dev/ttyS1
- * ...at this point you are connected to
- * the remote target and can use gdb
- * in the normal fasion. Setting
- * breakpoints, single stepping,
- * printing variables, etc.
- */
-#include <linux/config.h>
-#include <linux/string.h>
-#include <linux/kernel.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/console.h>
-#include <linux/init.h>
-#include <linux/smp.h>
-#include <linux/spinlock.h>
-#include <linux/slab.h>
-#include <linux/reboot.h>
-
-#include <asm/asm.h>
-#include <asm/cacheflush.h>
-#include <asm/mipsregs.h>
-#include <asm/pgtable.h>
-#include <asm/system.h>
-#include <asm/gdb-stub.h>
-#include <asm/inst.h>
-
-/*
- * external low-level support routines
- */
-
-extern int putDebugChar(char c); /* write a single character */
-extern char getDebugChar(void); /* read and return a single char */
-extern void trap_low(void);
-
-/*
- * breakpoint and test functions
- */
-extern void breakpoint(void);
-extern void breakinst(void);
-extern void async_breakpoint(void);
-extern void async_breakinst(void);
-extern void adel(void);
-
-/*
- * local prototypes
- */
-
-static void getpacket(char *buffer);
-static void putpacket(char *buffer);
-static int computeSignal(int tt);
-static int hex(unsigned char ch);
-static int hexToInt(char **ptr, int *intValue);
-static int hexToLong(char **ptr, long *longValue);
-static unsigned char *mem2hex(char *mem, char *buf, int count, int may_fault);
-void handle_exception(struct gdb_regs *regs);
-
-/*
- * spin locks for smp case
- */
-static spinlock_t kgdb_lock = SPIN_LOCK_UNLOCKED;
-static spinlock_t kgdb_cpulock[NR_CPUS] = { [0 ... NR_CPUS-1] = SPIN_LOCK_UNLOCKED};
-
-/*
- * 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 input_buffer[BUFMAX];
-static char output_buffer[BUFMAX];
-static int initialized; /* !0 means we've been initialized */
-static int kgdb_started;
-static const char hexchars[]="0123456789abcdef";
-
-/* Used to prevent crashes in memory access. Note that they'll crash anyway if
- we haven't set up fault handlers yet... */
-int kgdb_read_byte(unsigned char *address, unsigned char *dest);
-int kgdb_write_byte(unsigned char val, unsigned char *dest);
-
-/*
- * 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;
-}
-
-/*
- * 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();
- 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 sequence 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(char *buffer)
-{
- unsigned char checksum;
- int count;
- unsigned char ch;
-
- /*
- * $<packet info>#<checksum>.
- */
-
- do {
- putDebugChar('$');
- checksum = 0;
- count = 0;
-
- while ((ch = buffer[count]) != 0) {
- if (!(putDebugChar(ch)))
- return;
- checksum += ch;
- count += 1;
- }
-
- putDebugChar('#');
- putDebugChar(hexchars[checksum >> 4]);
- putDebugChar(hexchars[checksum & 0xf]);
-
- }
- while ((getDebugChar() & 0x7f) != '+');
-}
-
-
-/*
- * 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.
- * may_fault is non-zero if we are reading from arbitrary memory, but is currently
- * not used.
- */
-static unsigned char *mem2hex(char *mem, char *buf, int count, int may_fault)
-{
- unsigned char ch;
-
- while (count-- > 0) {
- if (kgdb_read_byte(mem++, &ch) != 0)
- return 0;
- *buf++ = hexchars[ch >> 4];
- *buf++ = hexchars[ch & 0xf];
- }
-
- *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
- * may_fault is non-zero if we are reading from arbitrary memory, but is currently
- * not used.
- */
-static char *hex2mem(char *buf, char *mem, int count, int binary, int may_fault)
-{
- int i;
- unsigned char ch;
-
- for (i=0; i<count; i++)
- {
- if (binary) {
- ch = *buf++;
- if (ch == 0x7d)
- ch = 0x20 ^ *buf++;
- }
- else {
- ch = hex(*buf++) << 4;
- ch |= hex(*buf++);
- }
- if (kgdb_write_byte(ch, mem++) != 0)
- return 0;
- }
-
- return mem;
-}
-
-/*
- * This table contains the mapping between SPARC hardware trap types, and
- * signals, which are primarily what GDB understands. It also indicates
- * which hardware traps we need to commandeer when initializing the stub.
- */
-static struct hard_trap_info {
- unsigned char tt; /* Trap type code for MIPS R3xxx and R4xxx */
- unsigned char signo; /* Signal that we map this trap into */
-} hard_trap_info[] = {
- { 6, SIGBUS }, /* instruction bus error */
- { 7, SIGBUS }, /* data bus error */
- { 9, SIGTRAP }, /* break */
- { 10, SIGILL }, /* reserved instruction */
-/* { 11, SIGILL }, */ /* CPU unusable */
- { 12, SIGFPE }, /* overflow */
- { 13, SIGTRAP }, /* trap */
- { 14, SIGSEGV }, /* virtual instruction cache coherency */
- { 15, SIGFPE }, /* floating point exception */
- { 23, SIGSEGV }, /* watch */
- { 31, SIGSEGV }, /* virtual data cache coherency */
- { 0, 0} /* Must be last */
-};
-
-/* Save the normal trap handlers for user-mode traps. */
-void *saved_vectors[32];
-
-/*
- * Set up exception handlers for tracing and breakpoints
- */
-void set_debug_traps(void)
-{
- struct hard_trap_info *ht;
- unsigned long flags;
- unsigned char c;
-
- local_irq_save(flags);
- for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
- saved_vectors[ht->tt] = set_except_vector(ht->tt, trap_low);
-
- putDebugChar('+'); /* 'hello world' */
- /*
- * In case GDB is started before us, ack any packets
- * (presumably "$?#xx") sitting there.
- */
- while((c = getDebugChar()) != '$');
- while((c = getDebugChar()) != '#');
- c = getDebugChar(); /* eat first csum byte */
- c = getDebugChar(); /* eat second csum byte */
- putDebugChar('+'); /* ack it */
-
- initialized = 1;
- local_irq_restore(flags);
-}
-
-void restore_debug_traps(void)
-{
- struct hard_trap_info *ht;
- unsigned long flags;
-
- local_irq_save(flags);
- for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
- set_except_vector(ht->tt, saved_vectors[ht->tt]);
- local_irq_restore(flags);
-}
-
-/*
- * Convert the MIPS hardware trap type code to a Unix signal number.
- */
-static int computeSignal(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 */
-}
-
-/*
- * 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;
-
- while (**ptr) {
- hexValue = hex(**ptr);
- if (hexValue < 0)
- break;
-
- *intValue = (*intValue << 4) | hexValue;
- numChars ++;
-
- (*ptr)++;
- }
-
- return (numChars);
-}
-
-static int hexToLong(char **ptr, long *longValue)
-{
- int numChars = 0;
- int hexValue;
-
- *longValue = 0;
-
- while (**ptr) {
- hexValue = hex(**ptr);
- if (hexValue < 0)
- break;
-
- *longValue = (*longValue << 4) | hexValue;
- numChars ++;
-
- (*ptr)++;
- }
-
- return numChars;
-}
-
-
-#if 0
-/*
- * Print registers (on target console)
- * Used only to debug the stub...
- */
-void show_gdbregs(struct gdb_regs * regs)
-{
- /*
- * Saved main processor registers
- */
- printk("$0 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
- regs->reg0, regs->reg1, regs->reg2, regs->reg3,
- regs->reg4, regs->reg5, regs->reg6, regs->reg7);
- printk("$8 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
- regs->reg8, regs->reg9, regs->reg10, regs->reg11,
- regs->reg12, regs->reg13, regs->reg14, regs->reg15);
- printk("$16: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
- regs->reg16, regs->reg17, regs->reg18, regs->reg19,
- regs->reg20, regs->reg21, regs->reg22, regs->reg23);
- printk("$24: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
- regs->reg24, regs->reg25, regs->reg26, regs->reg27,
- regs->reg28, regs->reg29, regs->reg30, regs->reg31);
-
- /*
- * Saved cp0 registers
- */
- printk("epc : %08lx\nStatus: %08lx\nCause : %08lx\n",
- regs->cp0_epc, regs->cp0_status, regs->cp0_cause);
-}
-#endif /* dead code */
-
-/*
- * We single-step by setting breakpoints. When an exception
- * is handled, we need to restore the instructions hoisted
- * when the breakpoints were set.
- *
- * This is where we save the original instructions.
- */
-static struct gdb_bp_save {
- unsigned long addr;
- unsigned int val;
-} step_bp[2];
-
-#define BP 0x0000000d /* break opcode */
-
-/*
- * Set breakpoint instructions for single stepping.
- */
-static void single_step(struct gdb_regs *regs)
-{
- union mips_instruction insn;
- unsigned long targ;
- int is_branch, is_cond, i;
-
- targ = regs->cp0_epc;
- insn.word = *(unsigned int *)targ;
- is_branch = is_cond = 0;
-
- switch (insn.i_format.opcode) {
- /*
- * jr and jalr are in r_format format.
- */
- case spec_op:
- switch (insn.r_format.func) {
- case jalr_op:
- case jr_op:
- targ = *(&regs->reg0 + insn.r_format.rs);
- is_branch = 1;
- break;
- }
- break;
-
- /*
- * This group contains:
- * bltz_op, bgez_op, bltzl_op, bgezl_op,
- * bltzal_op, bgezal_op, bltzall_op, bgezall_op.
- */
- case bcond_op:
- is_branch = is_cond = 1;
- targ += 4 + (insn.i_format.simmediate << 2);
- break;
-
- /*
- * These are unconditional and in j_format.
- */
- case jal_op:
- case j_op:
- is_branch = 1;
- targ += 4;
- targ >>= 28;
- targ <<= 28;
- targ |= (insn.j_format.target << 2);
- break;
-
- /*
- * These are conditional.
- */
- case beq_op:
- case beql_op:
- case bne_op:
- case bnel_op:
- case blez_op:
- case blezl_op:
- case bgtz_op:
- case bgtzl_op:
- case cop0_op:
- case cop1_op:
- case cop2_op:
- case cop1x_op:
- is_branch = is_cond = 1;
- targ += 4 + (insn.i_format.simmediate << 2);
- break;
- }
-
- if (is_branch) {
- i = 0;
- if (is_cond && targ != (regs->cp0_epc + 8)) {
- step_bp[i].addr = regs->cp0_epc + 8;
- step_bp[i++].val = *(unsigned *)(regs->cp0_epc + 8);
- *(unsigned *)(regs->cp0_epc + 8) = BP;
- }
- step_bp[i].addr = targ;
- step_bp[i].val = *(unsigned *)targ;
- *(unsigned *)targ = BP;
- } else {
- step_bp[0].addr = regs->cp0_epc + 4;
- step_bp[0].val = *(unsigned *)(regs->cp0_epc + 4);
- *(unsigned *)(regs->cp0_epc + 4) = BP;
- }
-}
-
-/*
- * If asynchronously interrupted by gdb, then we need to set a breakpoint
- * at the interrupted instruction so that we wind up stopped with a
- * reasonable stack frame.
- */
-static struct gdb_bp_save async_bp;
-
-/*
- * Swap the interrupted EPC with our asynchronous breakpoint routine.
- * This is safer than stuffing the breakpoint in-place, since no cache
- * flushes (or resulting smp_call_functions) are required. The
- * assumption is that only one CPU will be handling asynchronous bp's,
- * and only one can be active at a time.
- */
-extern spinlock_t smp_call_lock;
-void set_async_breakpoint(unsigned long *epc)
-{
- /* skip breaking into userland */
- if ((*epc & 0x80000000) == 0)
- return;
-
- /* avoid deadlock if someone is make IPC */
- if (spin_is_locked(&smp_call_lock))
- return;
-
- async_bp.addr = *epc;
- *epc = (unsigned long)async_breakpoint;
-}
-
-void kgdb_wait(void *arg)
-{
- unsigned flags;
- int cpu = smp_processor_id();
-
- local_irq_save(flags);
-
- spin_lock(&kgdb_cpulock[cpu]);
- spin_unlock(&kgdb_cpulock[cpu]);
-
- local_irq_restore(flags);
-}
-
-
-/*
- * This function does all command processing for interfacing to gdb. It
- * returns 1 if you should skip the instruction at the trap address, 0
- * otherwise.
- */
-void handle_exception (struct gdb_regs *regs)
-{
- int trap; /* Trap type */
- int sigval;
- long addr;
- int length;
- char *ptr;
- unsigned long *stack;
- int i;
- int bflag = 0;
-
- kgdb_started = 1;
-
- /*
- * acquire the big kgdb spinlock
- */
- if (!spin_trylock(&kgdb_lock)) {
- /*
- * some other CPU has the lock, we should go back to
- * receive the gdb_wait IPC
- */
- return;
- }
-
- /*
- * If we're in async_breakpoint(), restore the real EPC from
- * the breakpoint.
- */
- if (regs->cp0_epc == (unsigned long)async_breakinst) {
- regs->cp0_epc = async_bp.addr;
- async_bp.addr = 0;
- }
-
- /*
- * acquire the CPU spinlocks
- */
- for (i = num_online_cpus()-1; i >= 0; i--)
- if (spin_trylock(&kgdb_cpulock[i]) == 0)
- panic("kgdb: couldn't get cpulock %d\n", i);
-
- /*
- * force other cpus to enter kgdb
- */
- smp_call_function(kgdb_wait, NULL, 0, 0);
-
- /*
- * If we're in breakpoint() increment the PC
- */
- trap = (regs->cp0_cause & 0x7c) >> 2;
- if (trap == 9 && regs->cp0_epc == (unsigned long)breakinst)
- regs->cp0_epc += 4;
-
- /*
- * If we were single_stepping, restore the opcodes hoisted
- * for the breakpoint[s].
- */
- if (step_bp[0].addr) {
- *(unsigned *)step_bp[0].addr = step_bp[0].val;
- step_bp[0].addr = 0;
-
- if (step_bp[1].addr) {
- *(unsigned *)step_bp[1].addr = step_bp[1].val;
- step_bp[1].addr = 0;
- }
- }
-
- stack = (long *)regs->reg29; /* stack ptr */
- sigval = computeSignal(trap);
-
- /*
- * reply to host that an exception has occurred
- */
- ptr = output_buffer;
-
- /*
- * Send trap type (converted to signal)
- */
- *ptr++ = 'T';
- *ptr++ = hexchars[sigval >> 4];
- *ptr++ = hexchars[sigval & 0xf];
-
- /*
- * Send Error PC
- */
- *ptr++ = hexchars[REG_EPC >> 4];
- *ptr++ = hexchars[REG_EPC & 0xf];
- *ptr++ = ':';
- ptr = mem2hex((char *)&regs->cp0_epc, ptr, sizeof(long), 0);
- *ptr++ = ';';
-
- /*
- * Send frame pointer
- */
- *ptr++ = hexchars[REG_FP >> 4];
- *ptr++ = hexchars[REG_FP & 0xf];
- *ptr++ = ':';
- ptr = mem2hex((char *)&regs->reg30, ptr, sizeof(long), 0);
- *ptr++ = ';';
-
- /*
- * Send stack pointer
- */
- *ptr++ = hexchars[REG_SP >> 4];
- *ptr++ = hexchars[REG_SP & 0xf];
- *ptr++ = ':';
- ptr = mem2hex((char *)&regs->reg29, ptr, sizeof(long), 0);
- *ptr++ = ';';
-
- *ptr++ = 0;
- putpacket(output_buffer); /* send it off... */
-
- /*
- * Wait for input from remote GDB
- */
- while (1) {
- output_buffer[0] = 0;
- getpacket(input_buffer);
-
- switch (input_buffer[0])
- {
- case '?':
- output_buffer[0] = 'S';
- output_buffer[1] = hexchars[sigval >> 4];
- output_buffer[2] = hexchars[sigval & 0xf];
- output_buffer[3] = 0;
- break;
-
- /*
- * Detach debugger; let CPU run
- */
- case 'D':
- putpacket(output_buffer);
- goto finish_kgdb;
- break;
-
- case 'd':
- /* toggle debug flag */
- break;
-
- /*
- * Return the value of the CPU registers
- */
- case 'g':
- ptr = output_buffer;
- ptr = mem2hex((char *)&regs->reg0, ptr, 32*sizeof(long), 0); /* r0...r31 */
- ptr = mem2hex((char *)&regs->cp0_status, ptr, 6*sizeof(long), 0); /* cp0 */
- ptr = mem2hex((char *)&regs->fpr0, ptr, 32*sizeof(long), 0); /* f0...31 */
- ptr = mem2hex((char *)&regs->cp1_fsr, ptr, 2*sizeof(long), 0); /* cp1 */
- ptr = mem2hex((char *)&regs->frame_ptr, ptr, 2*sizeof(long), 0); /* frp */
- ptr = mem2hex((char *)&regs->cp0_index, ptr, 16*sizeof(long), 0); /* cp0 */
- break;
-
- /*
- * set the value of the CPU registers - return OK
- */
- case 'G':
- {
- ptr = &input_buffer[1];
- hex2mem(ptr, (char *)&regs->reg0, 32*sizeof(long), 0, 0);
- ptr += 32*(2*sizeof(long));
- hex2mem(ptr, (char *)&regs->cp0_status, 6*sizeof(long), 0, 0);
- ptr += 6*(2*sizeof(long));
- hex2mem(ptr, (char *)&regs->fpr0, 32*sizeof(long), 0, 0);
- ptr += 32*(2*sizeof(long));
- hex2mem(ptr, (char *)&regs->cp1_fsr, 2*sizeof(long), 0, 0);
- ptr += 2*(2*sizeof(long));
- hex2mem(ptr, (char *)&regs->frame_ptr, 2*sizeof(long), 0, 0);
- ptr += 2*(2*sizeof(long));
- hex2mem(ptr, (char *)&regs->cp0_index, 16*sizeof(long), 0, 0);
- strcpy(output_buffer,"OK");
- }
- break;
-
- /*
- * mAA..AA,LLLL Read LLLL bytes at address AA..AA
- */
- case 'm':
- ptr = &input_buffer[1];
-
- if (hexToLong(&ptr, &addr)
- && *ptr++ == ','
- && hexToInt(&ptr, &length)) {
- if (mem2hex((char *)addr, output_buffer, length, 1))
- break;
- strcpy (output_buffer, "E03");
- } else
- strcpy(output_buffer,"E01");
- break;
-
- /*
- * XAA..AA,LLLL: Write LLLL escaped binary bytes at address AA.AA
- */
- case 'X':
- bflag = 1;
- /* fall through */
-
- /*
- * MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK
- */
- case 'M':
- ptr = &input_buffer[1];
-
- if (hexToLong(&ptr, &addr)
- && *ptr++ == ','
- && hexToInt(&ptr, &length)
- && *ptr++ == ':') {
- if (hex2mem(ptr, (char *)addr, length, bflag, 1))
- strcpy(output_buffer, "OK");
- else
- strcpy(output_buffer, "E03");
- }
- else
- strcpy(output_buffer, "E02");
- break;
-
- /*
- * cAA..AA Continue at address AA..AA(optional)
- */
- case 'c':
- /* try to read optional parameter, pc unchanged if no parm */
-
- ptr = &input_buffer[1];
- if (hexToLong(&ptr, &addr))
- regs->cp0_epc = addr;
-
- goto exit_kgdb_exception;
- break;
-
- /*
- * kill the program; let us try to restart the machine
- * Reset the whole machine.
- */
- case 'k':
- case 'r':
- machine_restart("kgdb restarts machine");
- break;
-
- /*
- * Step to next instruction
- */
- case 's':
- /*
- * There is no single step insn in the MIPS ISA, so we
- * use breakpoints and continue, instead.
- */
- single_step(regs);
- goto exit_kgdb_exception;
- /* NOTREACHED */
- break;
-
- /*
- * Set baud rate (bBB)
- * FIXME: Needs to be written
- */
- case 'b':
- {
-#if 0
- int baudrate;
- extern void set_timer_3();
-
- ptr = &input_buffer[1];
- if (!hexToInt(&ptr, &baudrate))
- {
- strcpy(output_buffer,"B01");
- break;
- }
-
- /* Convert baud rate to uart clock divider */
-
- switch (baudrate)
- {
- case 38400:
- baudrate = 16;
- break;
- case 19200:
- baudrate = 33;
- break;
- case 9600:
- baudrate = 65;
- break;
- default:
- baudrate = 0;
- strcpy(output_buffer,"B02");
- goto x1;
- }
-
- if (baudrate) {
- putpacket("OK"); /* Ack before changing speed */
- set_timer_3(baudrate); /* Set it */
- }
-#endif
- }
- break;
-
- } /* switch */
-
- /*
- * reply to the request
- */
-
- putpacket(output_buffer);
-
- } /* while */
-
- return;
-
-finish_kgdb:
- restore_debug_traps();
-
-exit_kgdb_exception:
- /* release locks so other CPUs can go */
- for (i = num_online_cpus()-1; i >= 0; i--)
- spin_unlock(&kgdb_cpulock[i]);
- spin_unlock(&kgdb_lock);
-
- __flush_cache_all();
- return;
-}
-
-/*
- * 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)
- return;
-
- __asm__ __volatile__(
- ".globl breakinst\n\t"
- ".set\tnoreorder\n\t"
- "nop\n"
- "breakinst:\tbreak\n\t"
- "nop\n\t"
- ".set\treorder"
- );
-}
-
-/* Nothing but the break; don't pollute any registers */
-void async_breakpoint(void)
-{
- __asm__ __volatile__(
- ".globl async_breakinst\n\t"
- ".set\tnoreorder\n\t"
- "nop\n"
- "async_breakinst:\tbreak\n\t"
- "nop\n\t"
- ".set\treorder"
- );
-}
-
-void adel(void)
-{
- __asm__ __volatile__(
- ".globl\tadel\n\t"
- "lui\t$8,0x8000\n\t"
- "lw\t$9,1($8)\n\t"
- );
-}
-
-/*
- * malloc is needed by gdb client in "call func()", even a private one
- * will make gdb happy
- */
-static void *malloc(size_t size)
-{
- return kmalloc(size, GFP_ATOMIC);
-}
-
-static void free(void *where)
-{
- kfree(where);
-}
-
-#ifdef CONFIG_GDB_CONSOLE
-
-void gdb_putsn(const char *str, int l)
-{
- char outbuf[18];
-
- if (!kgdb_started)
- return;
-
- outbuf[0]='O';
-
- while(l) {
- int i = (l>8)?8:l;
- mem2hex((char *)str, &outbuf[1], i, 0);
- outbuf[(i*2)+1]=0;
- putpacket(outbuf);
- str += i;
- l -= i;
- }
-}
-
-static void gdb_console_write(struct console *con, const char *s, unsigned n)
-{
- gdb_putsn(s, n);
-}
-
-static struct console gdb_console = {
- .name = "gdb",
- .write = gdb_console_write,
- .flags = CON_PRINTBUFFER,
- .index = -1
-};
-
-static int __init register_gdb_console(void)
-{
- register_console(&gdb_console);
-
- return 0;
-}
-
-console_initcall(register_gdb_console);
-
-#endif
diff -puN arch/mips/kernel/irq.c~mips-lite arch/mips/kernel/irq.c
--- linux-2.6.10-rc1/arch/mips/kernel/irq.c~mips-lite 2004-10-29 11:26:45.179280287 -0700
+++ linux-2.6.10-rc1-trini/arch/mips/kernel/irq.c 2004-10-29 11:26:45.207273714 -0700
@@ -22,6 +22,7 @@
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/kallsyms.h>
+#include <linux/kgdb.h>

#include <asm/atomic.h>
#include <asm/system.h>
@@ -420,6 +421,8 @@ out:

irq_exit();

+ kgdb_process_breakpoint();
+
return 1;
}

diff -puN /dev/null arch/mips/kernel/kgdb.c
--- /dev/null 2004-10-25 00:35:20.587727328 -0700
+++ linux-2.6.10-rc1-trini/arch/mips/kernel/kgdb.c 2004-10-29 11:26:45.208273480 -0700
@@ -0,0 +1,292 @@
+/*
+ * arch/mips/kernel/kgdb.c
+ *
+ * Originally written by Glenn Engel, Lake Stevens Instrument Division
+ *
+ * Contributed by HP Systems
+ *
+ * Modified for SPARC by Stu Grossman, Cygnus Support.
+ *
+ * Modified for Linux/MIPS (and MIPS in general) by Andreas Busse
+ * Send complaints, suggestions etc. to <andy@xxxxxxxxxxxxxxx>
+ *
+ * Copyright (C) 1995 Andreas Busse
+ *
+ * Copyright (C) 2003 MontaVista Software Inc.
+ * Author: Jun Sun, jsun@xxxxxxxxxx or jsun@xxxxxxxxxx
+ *
+ * Copyright (C) 2004 MontaVista Software Inc.
+ * Author: Manish Lachwani, mlachwani@xxxxxxxxxx or manish@xxxxxxxxxxxxxxxx
+ *
+ * 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/string.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/debugger.h>
+#include <asm/system.h>
+#include <asm/ptrace.h> /* for linux pt_regs struct */
+#include <linux/kgdb.h>
+#include <linux/init.h>
+#include <linux/debugger.h>
+#include <asm/inst.h>
+#include <asm/gdb-stub.h>
+#include <asm/cacheflush.h>
+#include <asm/kdebug.h>
+
+static struct hard_trap_info {
+ unsigned char tt; /* Trap type code for MIPS R3xxx and R4xxx */
+ unsigned char signo; /* Signal that we map this trap into */
+} hard_trap_info[] = {
+ { 6, SIGBUS }, /* instruction bus error */
+ { 7, SIGBUS }, /* data bus error */
+ { 9, SIGTRAP }, /* break */
+ { 10, SIGILL }, /* reserved instruction */
+/* { 11, SIGILL }, */ /* CPU unusable */
+ { 12, SIGFPE }, /* overflow */
+ { 13, SIGTRAP }, /* trap */
+ { 14, SIGSEGV }, /* virtual instruction cache coherency */
+ { 15, SIGFPE }, /* floating point exception */
+ { 23, SIGSEGV }, /* watch */
+ { 31, SIGSEGV }, /* virtual data cache coherency */
+ { 0, 0} /* Must be last */
+};
+
+extern atomic_t cpu_doing_single_step;
+
+/* Save the normal trap handlers for user-mode traps. */
+void *saved_vectors[32];
+extern void trap_low(void);
+extern void breakinst(void);
+
+static int compute_signal(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 */
+}
+
+/*
+ * Set up exception handlers for tracing and breakpoints
+ */
+void handle_exception(struct pt_regs *regs)
+{
+ int trap = (regs->cp0_cause & 0x7c) >> 2;
+
+ if (atomic_read(&debugger_active))
+ debugger_nmihook(smp_processor_id(), regs);
+
+ if (atomic_read (&kgdb_setting_breakpoint))
+ if ( (trap == 9) && (regs->cp0_epc == (unsigned long)breakinst) )
+ regs->cp0_epc += 4;
+
+ (*linux_debug_hook) (0, compute_signal(trap), 0, regs);
+
+ /* In SMP mode, __flush_cache_all does IPI */
+ __flush_cache_all();
+}
+
+void set_debug_traps(void)
+{
+ struct hard_trap_info *ht;
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
+ saved_vectors[ht->tt] = set_except_vector(ht->tt, trap_low);
+
+ local_irq_restore(flags);
+}
+
+#if 0
+/* This should be called before we exit kgdb_handle_exception() I believe.
+ * -- Tom
+ */
+void restore_debug_traps(void)
+{
+ struct hard_trap_info *ht;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
+ set_except_vector(ht->tt, saved_vectors[ht->tt]);
+ local_irq_restore(flags);
+}
+#endif
+
+void regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+ int reg = 0;
+ unsigned long *ptr = gdb_regs;
+
+ for (reg = 0; reg < 32; reg++)
+ *(ptr++) = regs->regs[reg];
+
+ *(ptr++) = regs->cp0_status;
+ *(ptr++) = regs->lo;
+ *(ptr++) = regs->hi;
+ *(ptr++) = regs->cp0_badvaddr;
+ *(ptr++) = regs->cp0_cause;
+ *(ptr++) = regs->cp0_epc;
+
+ return;
+}
+
+void gdb_regs_to_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+ int reg = 0;
+ unsigned long *ptr = gdb_regs;
+
+ for (reg = 0; reg < 32; reg++)
+ regs->regs[reg] = *(ptr++);
+
+ regs->cp0_status = *(ptr++);
+ regs->lo = *(ptr++);
+ regs->hi = *(ptr++);
+ regs->cp0_badvaddr = *(ptr++);
+ regs->cp0_cause = *(ptr++);
+ regs->cp0_epc = *(ptr++);
+
+ return;
+}
+
+/*
+ * Similar to regs_to_gdb_regs() except that process is sleeping and so
+ * we may not be able to get all the info.
+ */
+void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
+{
+ int reg = 0;
+ struct thread_info *ti = p->thread_info;
+ unsigned long ksp = (unsigned long)ti + THREAD_SIZE -32;
+ struct pt_regs *regs = (struct pt_regs *)ksp - 1;
+ unsigned long *ptr = gdb_regs;
+
+ for (reg = 0; reg < 16; reg++)
+ *(ptr++) = regs->regs[reg];
+
+ /* S0 - S7 */
+ for (reg = 16; reg < 24; reg++)
+ *(ptr++) = regs->regs[reg];
+
+ for (reg = 24; reg < 28; reg++)
+ *(ptr++) = 0;
+
+ /* GP, SP, FP, RA */
+ for (reg = 28; reg < 32; reg++)
+ *(ptr++) = regs->regs[reg];
+
+ *(ptr++) = regs->cp0_status;
+ *(ptr++) = regs->lo;
+ *(ptr++) = regs->hi;
+ *(ptr++) = regs->cp0_badvaddr;
+ *(ptr++) = regs->cp0_cause;
+ *(ptr++) = regs->cp0_epc;
+
+ return;
+}
+
+/*
+ * Calls linux_debug_hook before the kernel dies. If KGDB is enabled,
+ * then try to fall into the debugger
+ */
+static int kgdb_mips_notify(struct notifier_block *self, unsigned long cmd,
+ void *ptr)
+{
+ struct die_args *args = (struct die_args *)ptr;
+ struct pt_regs *regs = args->regs;
+ int trap = (regs->cp0_cause & 0x7c) >> 2;
+
+ if (cmd == DIE_PAGE_FAULT)
+ return NOTIFY_DONE;
+
+ if (user_mode(regs)) {
+ if (cmd == DIE_OOPS)
+ CHK_DEBUGGER(trap, compute_signal(trap), 0, regs, 0);
+ return NOTIFY_DONE;
+ }
+
+ CHK_DEBUGGER(trap, compute_signal(trap), 0, regs, 0);
+ return NOTIFY_OK;
+}
+
+static struct notifier_block kgdb_notifier = {
+ .notifier_call = kgdb_mips_notify,
+};
+
+/*
+ * Handle the 's' and 'c' commands
+ */
+int kgdb_arch_handle_exception(int vector, int signo, int err_code,
+ char *InBuffer, char *outBuffer,
+ struct pt_regs *regs)
+{
+ char *ptr;
+ unsigned long address;
+ int cpu = smp_processor_id ();
+
+ switch (InBuffer[0]) {
+ case 's':
+ case 'c':
+ if (kgdb_contthread && kgdb_contthread != current) {
+ strcpy(outBuffer, "E00");
+ break;
+ }
+
+ /* handle the optional parameter */
+ ptr = &InBuffer[1];
+ if (kgdb_hex2long (&ptr, &address))
+ regs->cp0_epc = address;
+
+ atomic_set(&cpu_doing_single_step,-1);
+ if (InBuffer[0] == 's')
+ if (kgdb_contthread)
+ atomic_set(&cpu_doing_single_step, cpu);
+
+ return 0;
+ }
+
+ return -1;
+}
+
+struct kgdb_arch arch_kgdb_ops = {
+#ifdef CONFIG_CPU_LITTLE_ENDIAN
+ .gdb_bpt_instr = {0xd},
+#else
+ .gdb_bpt_instr = {0x00, 0x00, 0x00, 0x0d},
+#endif
+};
+
+/*
+ * Note that on some boards (such as MIPS Malta) we need to do additional
+ * bringup. We do this via kgdb_mips_init(). We provide a weak version
+ * here as others (such as BCM91250A-SWARM) need no extra bringup.
+ */
+void __attribute__ ((weak)) kgdb_mips_init(void)
+{
+}
+
+int kgdb_arch_init(void)
+{
+ /* Board-specifics. */
+ kgdb_mips_init();
+
+ /* Set our traps. */
+ /* This needs to be done more finely grained again, paired in
+ * a before/after in kgdb_handle_exception(...) -- Tom */
+ set_debug_traps();
+ notifier_chain_register(&mips_die_chain, &kgdb_notifier);
+
+ return 0;
+}
diff -puN /dev/null arch/mips/kernel/kgdb_handler.S
--- /dev/null 2004-10-25 00:35:20.587727328 -0700
+++ linux-2.6.10-rc1-trini/arch/mips/kernel/kgdb_handler.S 2004-10-29 11:26:45.208273480 -0700
@@ -0,0 +1,58 @@
+/*
+ * arch/mips/kernel/kgdb_handler.S
+ *
+ * Copyright (C) 2004 MontaVista Software Inc.
+ * Author: Manish Lachwani, mlachwani@xxxxxxxxxx or manish@xxxxxxxxxxxxxxxx
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+/*
+ * Trap Handler for the new KGDB framework. The main KGDB handler is
+ * handle_exception that will be called from here
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/sys.h>
+
+#include <asm/asm.h>
+#include <asm/errno.h>
+#include <asm/mipsregs.h>
+#include <asm/regdef.h>
+#include <asm/stackframe.h>
+
+ .align 5
+ NESTED(trap_low, PT_SIZE, sp)
+ .set noat
+ .set noreorder
+ SAVE_ALL
+ /*
+ * Check for privileged instructions in user mode. For
+ * this, check the cu0 bit in the CPU status register.
+ */
+ mfc0 k0, CP0_STATUS
+ sll k0, 3
+ bltz k0, 1f
+ move k1, sp
+
+ /*
+ * GDB userland from within KGDB. If a user mode address
+ * then jump to the saved exception handler
+ */
+ lui k1, %hi(saved_vectors)
+ mfc0 k0, CP0_CAUSE
+ andi k0, k0, 0x7c
+ add k1, k1, k0
+ lw k0, %lo(saved_vectors)(k1)
+ jr k0
+ nop
+1:
+ .set at
+ .set reorder
+ move a0, sp
+ jal handle_exception
+ j ret_from_exception
+ END(trap_low)
diff -puN arch/mips/kernel/traps.c~mips-lite arch/mips/kernel/traps.c
--- linux-2.6.10-rc1/arch/mips/kernel/traps.c~mips-lite 2004-10-29 11:26:45.181279818 -0700
+++ linux-2.6.10-rc1-trini/arch/mips/kernel/traps.c 2004-10-29 11:26:45.210273010 -0700
@@ -10,6 +10,8 @@
* Kevin D. Kissell, kevink@xxxxxxxx and Carsten Langgaard, carstenl@xxxxxxxx
* Copyright (C) 2000, 01 MIPS Technologies, Inc.
* Copyright (C) 2002, 2003, 2004 Maciej W. Rozycki
+ *
+ * KGDB specific changes - Manish Lachwani (mlachwani@xxxxxxxxxx)
*/
#include <linux/config.h>
#include <linux/init.h>
@@ -20,6 +22,7 @@
#include <linux/smp_lock.h>
#include <linux/spinlock.h>
#include <linux/kallsyms.h>
+#include <linux/debugger.h>

#include <asm/bootinfo.h>
#include <asm/branch.h>
@@ -37,6 +40,7 @@
#include <asm/mmu_context.h>
#include <asm/watch.h>
#include <asm/types.h>
+#include <asm/kdebug.h>

extern asmlinkage void handle_mod(void);
extern asmlinkage void handle_tlbl(void);
@@ -72,6 +76,21 @@ int (*board_be_handler)(struct pt_regs *
*/
#define MODULE_RANGE (8*1024*1024)

+struct notifier_block *mips_die_chain;
+static spinlock_t die_notifier_lock = SPIN_LOCK_UNLOCKED;
+
+int register_die_notifier(struct notifier_block *nb)
+{
+ int err = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&die_notifier_lock, flags);
+ err = notifier_chain_register(&mips_die_chain, nb);
+ spin_unlock_irqrestore(&die_notifier_lock, flags);
+
+ return err;
+}
+
/*
* This routine abuses get_user()/put_user() to reference pointers
* with at least a bit of error checking ...
@@ -265,8 +284,10 @@ NORET_TYPE void __die(const char * str,
void __die_if_kernel(const char * str, struct pt_regs * regs,
const char * file, const char * func, unsigned long line)
{
- if (!user_mode(regs))
+ if (!user_mode(regs)) {
+ notify_die(DIE_TRAP, (char *)str, regs, 0);
__die(str, regs, file, func, line);
+ }
}

extern const struct exception_table_entry __start___dbe_table[];
@@ -921,6 +942,9 @@ void __init per_cpu_trap_init(void)
tlb_init();
}

+/* Keep track of if we've done certain initialization already or not. */
+int kgdb_early_setup;
+
void __init trap_init(void)
{
extern char except_vec3_generic, except_vec3_r4000;
@@ -928,6 +952,9 @@ void __init trap_init(void)
extern char except_vec4;
unsigned long i;

+ if (kgdb_early_setup)
+ return; /* Already done */
+
per_cpu_trap_init();

/*
diff -puN arch/mips/mips-boards/generic/Makefile~mips-lite arch/mips/mips-boards/generic/Makefile
--- linux-2.6.10-rc1/arch/mips/mips-boards/generic/Makefile~mips-lite 2004-10-29 11:26:45.183279348 -0700
+++ linux-2.6.10-rc1-trini/arch/mips/mips-boards/generic/Makefile 2004-10-29 11:26:45.210273010 -0700
@@ -21,6 +21,5 @@
obj-y := mipsIRQ.o reset.o display.o init.o memory.o \
printf.o cmdline.o time.o
obj-$(CONFIG_PCI) += pci.o
-obj-$(CONFIG_KGDB) += gdb_hook.o

EXTRA_AFLAGS := $(CFLAGS)
diff -puN arch/mips/mips-boards/generic/init.c~mips-lite arch/mips/mips-boards/generic/init.c
--- linux-2.6.10-rc1/arch/mips/mips-boards/generic/init.c~mips-lite 2004-10-29 11:26:45.185278879 -0700
+++ linux-2.6.10-rc1-trini/arch/mips/mips-boards/generic/init.c 2004-10-29 11:26:45.210273010 -0700
@@ -35,17 +35,6 @@
#include <asm/mips-boards/malta.h>
#endif

-#ifdef CONFIG_KGDB
-extern int rs_kgdb_hook(int, int);
-extern int rs_putDebugChar(char);
-extern char rs_getDebugChar(void);
-extern int saa9730_kgdb_hook(int);
-extern int saa9730_putDebugChar(char);
-extern char saa9730_getDebugChar(void);
-
-int remote_debug = 0;
-#endif
-
int prom_argc;
int *_prom_argv, *_prom_envp;

@@ -172,59 +161,6 @@ static void __init console_config(void)
}
#endif

-#ifdef CONFIG_KGDB
-void __init kgdb_config (void)
-{
- extern int (*generic_putDebugChar)(char);
- extern char (*generic_getDebugChar)(void);
- char *argptr;
- int line, speed;
-
- argptr = prom_getcmdline();
- if ((argptr = strstr(argptr, "kgdb=ttyS")) != NULL) {
- argptr += strlen("kgdb=ttyS");
- if (*argptr != '0' && *argptr != '1')
- printk("KGDB: Unknown serial line /dev/ttyS%c, "
- "falling back to /dev/ttyS1\n", *argptr);
- line = *argptr == '0' ? 0 : 1;
- printk("KGDB: Using serial line /dev/ttyS%d for session\n", line);
-
- speed = 0;
- if (*++argptr == ',')
- {
- int c;
- while ((c = *++argptr) && ('0' <= c && c <= '9'))
- speed = speed * 10 + c - '0';
- }
-#ifdef CONFIG_MIPS_ATLAS
- if (line == 1) {
- speed = saa9730_kgdb_hook(speed);
- generic_putDebugChar = saa9730_putDebugChar;
- generic_getDebugChar = saa9730_getDebugChar;
- }
- else
-#endif
- {
- speed = rs_kgdb_hook(line, speed);
- generic_putDebugChar = rs_putDebugChar;
- generic_getDebugChar = rs_getDebugChar;
- }
-
- prom_printf("KGDB: Using serial line /dev/ttyS%d at %d for session, "
- "please connect your debugger\n", line ? 1 : 0, speed);
-
- {
- char *s;
- for (s = "Please connect GDB to this port\r\n"; *s; )
- generic_putDebugChar (*s++);
- }
-
- remote_debug = 1;
- /* Breakpoint is invoked after interrupts are initialised */
- }
-}
-#endif
-
void __init prom_init(void)
{
prom_argc = fw_arg0;
diff -puN arch/mips/mips-boards/malta/malta_int.c~mips-lite arch/mips/mips-boards/malta/malta_int.c
--- linux-2.6.10-rc1/arch/mips/mips-boards/malta/malta_int.c~mips-lite 2004-10-29 11:26:45.187278409 -0700
+++ linux-2.6.10-rc1-trini/arch/mips/mips-boards/malta/malta_int.c 2004-10-29 11:26:45.211272776 -0700
@@ -40,12 +40,7 @@
#include <asm/mips-boards/msc01_pci.h>

extern asmlinkage void mipsIRQ(void);
-
-#ifdef CONFIG_KGDB
-extern void breakpoint(void);
-extern void set_debug_traps(void);
-extern int remote_debug;
-#endif
+extern int kgdb_early_setup;

static spinlock_t mips_irq_lock = SPIN_LOCK_UNLOCKED;

@@ -189,16 +184,20 @@ void corehi_irqdispatch(struct pt_regs *

void __init init_IRQ(void)
{
+ if (kgdb_early_setup)
+ return; /* Already done. */
set_except_vector(0, mipsIRQ);
init_generic_irq();
init_i8259_irqs();
+}

#ifdef CONFIG_KGDB
- if (remote_debug) {
- set_debug_traps();
- breakpoint();
- }
-#endif
+void kgdb_mips_init(void)
+{
+ trap_init();
+ set_except_vector(0, mipsIRQ);
+ init_generic_irq();
+ init_i8259_irqs();
+ kgdb_early_setup = 1;
}
-
-
+#endif
diff -puN arch/mips/mips-boards/malta/malta_setup.c~mips-lite arch/mips/mips-boards/malta/malta_setup.c
--- linux-2.6.10-rc1/arch/mips/mips-boards/malta/malta_setup.c~mips-lite 2004-10-29 11:26:45.188278175 -0700
+++ linux-2.6.10-rc1-trini/arch/mips/mips-boards/malta/malta_setup.c 2004-10-29 11:26:45.211272776 -0700
@@ -41,10 +41,6 @@ extern void mips_time_init(void);
extern void mips_timer_setup(struct irqaction *irq);
extern unsigned long mips_rtc_get_time(void);

-#ifdef CONFIG_KGDB
-extern void kgdb_config(void);
-#endif
-
struct resource standard_io_resources[] = {
{ "dma1", 0x00, 0x1f, IORESOURCE_BUSY },
{ "timer", 0x40, 0x5f, IORESOURCE_BUSY },
@@ -93,10 +89,6 @@ static int __init malta_setup(void)
*/
enable_dma(4);

-#ifdef CONFIG_KGDB
- kgdb_config ();
-#endif
-
if ((mips_revision_corid == MIPS_REVISION_CORID_BONITO64) ||
(mips_revision_corid == MIPS_REVISION_CORID_CORE_20K) ||
(mips_revision_corid == MIPS_REVISION_CORID_CORE_EMUL_BON)) {
diff -puN arch/mips/sibyte/cfe/setup.c~mips-lite arch/mips/sibyte/cfe/setup.c
--- linux-2.6.10-rc1/arch/mips/sibyte/cfe/setup.c~mips-lite 2004-10-29 11:26:45.190277705 -0700
+++ linux-2.6.10-rc1-trini/arch/mips/sibyte/cfe/setup.c 2004-10-29 11:26:45.212272541 -0700
@@ -62,10 +62,6 @@ extern void * __rd_start, * __rd_end;
static int reboot_smp = 0;
#endif

-#ifdef CONFIG_KGDB
-extern int kgdb_port;
-#endif
-
static void cfe_linux_exit(void)
{
#ifdef CONFIG_SMP
@@ -243,9 +239,6 @@ void __init prom_init(void)
int argc = fw_arg0;
char **envp = (char **) fw_arg2;
int *prom_vec = (int *) fw_arg3;
-#ifdef CONFIG_KGDB
- char *arg;
-#endif

_machine_restart = (void (*)(char *))cfe_linux_exit;
_machine_halt = cfe_linux_exit;
@@ -309,13 +302,6 @@ void __init prom_init(void)
}
}

-#ifdef CONFIG_KGDB
- if ((arg = strstr(arcs_cmdline,"kgdb=duart")) != NULL)
- kgdb_port = (arg[10] == '0') ? 0 : 1;
- else
- kgdb_port = 1;
-#endif
-
#ifdef CONFIG_BLK_DEV_INITRD
{
char *ptr;
diff -puN arch/mips/sibyte/sb1250/Makefile~mips-lite arch/mips/sibyte/sb1250/Makefile
--- linux-2.6.10-rc1/arch/mips/sibyte/sb1250/Makefile~mips-lite 2004-10-29 11:26:45.192277236 -0700
+++ linux-2.6.10-rc1-trini/arch/mips/sibyte/sb1250/Makefile 2004-10-29 11:26:45.212272541 -0700
@@ -4,5 +4,6 @@ obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_SIBYTE_TBPROF) += bcm1250_tbprof.o
obj-$(CONFIG_SIBYTE_STANDALONE) += prom.o
obj-$(CONFIG_SIBYTE_BUS_WATCHER) += bus_watcher.o
+obj-$(CONFIG_KGDB_SIBYTE) += kgdb_sibyte.o

EXTRA_AFLAGS := $(CFLAGS)
diff -puN arch/mips/sibyte/sb1250/irq.c~mips-lite arch/mips/sibyte/sb1250/irq.c
--- linux-2.6.10-rc1/arch/mips/sibyte/sb1250/irq.c~mips-lite 2004-10-29 11:26:45.194276766 -0700
+++ linux-2.6.10-rc1-trini/arch/mips/sibyte/sb1250/irq.c 2004-10-29 11:26:45.212272541 -0700
@@ -59,27 +59,7 @@ static void sb1250_set_affinity(unsigned
#ifdef CONFIG_SIBYTE_HAS_LDT
extern unsigned long ldt_eoi_space;
#endif
-
-#ifdef CONFIG_KGDB
-#include <asm/gdb-stub.h>
-extern void breakpoint(void);
-static int kgdb_irq;
-
-/* kgdb is on when configured. Pass "nokgdb" kernel arg to turn it off */
-static int kgdb_flag = 1;
-static int __init nokgdb(char *str)
-{
- kgdb_flag = 0;
- return 1;
-}
-__setup("nokgdb", nokgdb);
-
-/* Default to UART1 */
-int kgdb_port = 1;
-#ifdef CONFIG_SIBYTE_SB1250_DUART
-extern char sb1250_duart_present[];
-#endif
-#endif
+extern int kgdb_early_setup;

static struct hw_interrupt_type sb1250_irq_type = {
"SB1250-IMR",
@@ -340,6 +320,11 @@ void __init init_IRQ(void)
unsigned int imask = STATUSF_IP4 | STATUSF_IP3 | STATUSF_IP2 |
STATUSF_IP1 | STATUSF_IP0;

+#ifdef CONFIG_KGDB
+ if (kgdb_early_setup == 1)
+ return;
+#endif
+
/* Default everything to IP2 */
for (i = 0; i < SB1250_NR_IRQS; i++) { /* was I0 */
__raw_writeq(IMR_IP2_VAL,
@@ -389,49 +374,4 @@ void __init init_IRQ(void)
/* Enable necessary IPs, disable the rest */
change_c0_status(ST0_IM, imask);
set_except_vector(0, sb1250_irq_handler);
-
-#ifdef CONFIG_KGDB
- if (kgdb_flag) {
- kgdb_irq = K_INT_UART_0 + kgdb_port;
-
-#ifdef CONFIG_SIBYTE_SB1250_DUART
- sb1250_duart_present[kgdb_port] = 0;
-#endif
- /* Setup uart 1 settings, mapper */
- __raw_writeq(M_DUART_IMR_BRK, IOADDR(A_DUART_IMRREG(kgdb_port)));
-
- sb1250_steal_irq(kgdb_irq);
- __raw_writeq(IMR_IP6_VAL,
- IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MAP_BASE) +
- (kgdb_irq<<3)));
- sb1250_unmask_irq(0, kgdb_irq);
-
- prom_printf("Waiting for GDB on UART port %d\n", kgdb_port);
- set_debug_traps();
- breakpoint();
- }
-#endif
-}
-
-#ifdef CONFIG_KGDB
-
-#include <linux/delay.h>
-
-#define duart_out(reg, val) csr_out32(val, IOADDR(A_DUART_CHANREG(kgdb_port,reg)))
-#define duart_in(reg) csr_in32(IOADDR(A_DUART_CHANREG(kgdb_port,reg)))
-
-void sb1250_kgdb_interrupt(struct pt_regs *regs)
-{
- /*
- * Clear break-change status (allow some time for the remote
- * host to stop the break, since we would see another
- * interrupt on the end-of-break too)
- */
- kstat_this_cpu.irqs[kgdb_irq]++;
- mdelay(500);
- duart_out(R_DUART_CMD, V_DUART_MISC_CMD_RESET_BREAK_INT |
- M_DUART_RX_EN | M_DUART_TX_EN);
- set_async_breakpoint(&regs->cp0_epc);
}
-
-#endif /* CONFIG_KGDB */
diff -puN /dev/null arch/mips/sibyte/sb1250/kgdb_sibyte.c
--- /dev/null 2004-10-25 00:35:20.587727328 -0700
+++ linux-2.6.10-rc1-trini/arch/mips/sibyte/sb1250/kgdb_sibyte.c 2004-10-29 11:26:45.213272306 -0700
@@ -0,0 +1,158 @@
+/*
+ * arch/mips/sibyte/sb1250/kgdb_sibyte.c
+ *
+ * Author: Manish Lachwani, mlachwani@xxxxxxxxxx or manish@xxxxxxxxxxxxxxxx
+ *
+ * 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.
+ */
+
+/*
+ * Support for KGDB on the Broadcom Sibyte. The SWARM board
+ * for example does not have a 8250/16550 compatible serial
+ * port. Hence, we need to have a driver for the serial
+ * ports to handle KGDB. This board needs nothing in addition
+ * to what is normally provided by the gdb portion of the stub.
+ */
+
+#include <linux/delay.h>
+#include <linux/kernel_stat.h>
+#include <linux/init.h>
+#include <linux/kgdb.h>
+
+#include <asm/io.h>
+#include <asm/sibyte/sb1250.h>
+#include <asm/sibyte/sb1250_regs.h>
+#include <asm/sibyte/sb1250_uart.h>
+#include <asm/sibyte/sb1250_int.h>
+#include <asm/addrspace.h>
+
+int kgdb_port = 1;
+static int kgdb_irq;
+
+extern char sb1250_duart_present[];
+extern int sb1250_steal_irq(int irq);
+extern int kgdb_early_setup;
+
+/* Forward declarations. */
+static void kgdbsibyte_init_duart(void);
+
+#define IMR_IP6_VAL K_INT_MAP_I4
+#define duart_out(reg, val) csr_out32(val, IOADDR(A_DUART_CHANREG(kgdb_port,reg)))
+#define duart_in(reg) csr_in32(IOADDR(A_DUART_CHANREG(kgdb_port,reg)))
+
+static void kgdb_swarm_write_char(int c)
+{
+ while ((duart_in(R_DUART_STATUS) & M_DUART_TX_RDY) == 0);
+ duart_out(R_DUART_TX_HOLD, c);
+}
+
+static int kgdb_swarm_read_char(void)
+{
+ unsigned long flags;
+ int ret_char;
+ unsigned int status;
+
+ local_irq_save(flags);
+
+ status = duart_in(R_DUART_STATUS);
+ while ((status & M_DUART_RX_RDY) == 0) {
+ status = duart_in(R_DUART_STATUS);
+ }
+
+ /*
+ * Check for framing error
+ */
+ if (status & M_DUART_FRM_ERR) {
+ kgdbsibyte_init_duart();
+ kgdb_swarm_write_char('-');
+ return '-';
+ }
+
+ ret_char = duart_in(R_DUART_RX_HOLD);
+ local_irq_restore(flags);
+
+ return ret_char;
+}
+
+void sb1250_kgdb_interrupt(struct pt_regs *regs)
+{
+ int kgdb_irq = K_INT_UART_0 + kgdb_port;
+ /*
+ * Clear break-change status (allow some time for the remote
+ * host to stop the break, since we would see another
+ * interrupt on the end-of-break too)
+ */
+ kstat_this_cpu.irqs[kgdb_irq]++;
+ mdelay(500);
+ duart_out(R_DUART_CMD, V_DUART_MISC_CMD_RESET_BREAK_INT |
+ M_DUART_RX_EN | M_DUART_TX_EN);
+ kgdb_schedule_breakpoint();
+}
+
+/*
+ * We use port #1 and we set it for 115200 BAUD, 8n1.
+ */
+static void
+kgdbsibyte_init_duart(void)
+{
+ /* Set 8n1. */
+ duart_out(R_DUART_MODE_REG_1,
+ V_DUART_BITS_PER_CHAR_8 | V_DUART_PARITY_MODE_NONE);
+ duart_out(R_DUART_MODE_REG_2, M_DUART_STOP_BIT_LEN_1);
+ /* Set baud rate of 115200. */
+ duart_out(R_DUART_CLK_SEL, V_DUART_BAUD_RATE(115200));
+ /* Enable rx and tx */
+ duart_out(R_DUART_CMD, M_DUART_RX_EN | M_DUART_TX_EN);
+}
+
+static int
+kgdb_init_io(void)
+{
+#ifdef CONFIG_SIBYTE_SB1250_DUART
+ sb1250_duart_present[kgdb_port] = 0;
+#endif
+
+ kgdbsibyte_init_duart();
+
+ return 0;
+}
+
+struct kgdb_io kgdb_io_ops = {
+ .read_char = kgdb_swarm_read_char,
+ .write_char = kgdb_swarm_write_char,
+ .init = kgdb_init_io,
+ .late_init = kgdbsibyte_hookup_irq,
+};
+
+void kgdb_mips_init(void)
+{
+ if (kgdb_early_setup == 0) {
+ trap_init();
+ init_IRQ();
+ kgdb_early_setup = 1;
+ }
+}
+
+/*
+ * Hookup our IRQ line. We will already have been initialized a
+ * this point.
+ */
+static void __init kgdbsibyte_hookup_irq(void)
+{
+ /* Steal the IRQ. */
+ kgdb_irq = K_INT_UART_0 + kgdb_port;
+
+ /* Setup uart 1 settings, mapper */
+ __raw_writeq(M_DUART_IMR_BRK, IOADDR(A_DUART_IMRREG(kgdb_port)));
+
+ sb1250_steal_irq(kgdb_irq);
+
+ __raw_writeq(IMR_IP6_VAL,
+ IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MAP_BASE) +
+ (kgdb_irq<<3)));
+
+ sb1250_unmask_irq(0, kgdb_irq);
+}
diff -puN arch/mips/sibyte/swarm/Makefile~mips-lite arch/mips/sibyte/swarm/Makefile
--- linux-2.6.10-rc1/arch/mips/sibyte/swarm/Makefile~mips-lite 2004-10-29 11:26:45.196276297 -0700
+++ linux-2.6.10-rc1-trini/arch/mips/sibyte/swarm/Makefile 2004-10-29 11:26:45.213272306 -0700
@@ -1,3 +1 @@
lib-y = setup.o rtc_xicor1241.o rtc_m41t81.o
-
-lib-$(CONFIG_KGDB) += dbg_io.o
diff -L arch/mips/sibyte/swarm/dbg_io.c -puN arch/mips/sibyte/swarm/dbg_io.c~mips-lite /dev/null
--- linux-2.6.10-rc1/arch/mips/sibyte/swarm/dbg_io.c
+++ /dev/null 2004-10-25 00:35:20.587727328 -0700
@@ -1,76 +0,0 @@
-/*
- * kgdb debug routines for SiByte boards.
- *
- * Copyright (C) 2001 MontaVista Software Inc.
- * Author: Jun Sun, jsun@xxxxxxxxxx or jsun@xxxxxxxxxx
- *
- * 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.
- *
- */
-
-/* -------------------- BEGINNING OF CONFIG --------------------- */
-
-#include <linux/delay.h>
-#include <asm/io.h>
-#include <asm/sibyte/sb1250.h>
-#include <asm/sibyte/sb1250_regs.h>
-#include <asm/sibyte/sb1250_uart.h>
-#include <asm/sibyte/sb1250_int.h>
-#include <asm/addrspace.h>
-
-/*
- * We use the second serial port for kgdb traffic.
- * 115200, 8, N, 1.
- */
-
-#define BAUD_RATE 115200
-#define CLK_DIVISOR V_DUART_BAUD_RATE(BAUD_RATE)
-#define DATA_BITS V_DUART_BITS_PER_CHAR_8 /* or 7 */
-#define PARITY V_DUART_PARITY_MODE_NONE /* or even */
-#define STOP_BITS M_DUART_STOP_BIT_LEN_1 /* or 2 */
-
-static int duart_initialized = 0; /* 0: need to be init'ed by kgdb */
-
-/* -------------------- END OF CONFIG --------------------- */
-extern int kgdb_port;
-
-#define duart_out(reg, val) csr_out32(val, IOADDR(A_DUART_CHANREG(kgdb_port,reg)))
-#define duart_in(reg) csr_in32(IOADDR(A_DUART_CHANREG(kgdb_port,reg)))
-
-void putDebugChar(unsigned char c);
-unsigned char getDebugChar(void);
-static void
-duart_init(int clk_divisor, int data, int parity, int stop)
-{
- duart_out(R_DUART_MODE_REG_1, data | parity);
- duart_out(R_DUART_MODE_REG_2, stop);
- duart_out(R_DUART_CLK_SEL, clk_divisor);
-
- duart_out(R_DUART_CMD, M_DUART_RX_EN | M_DUART_TX_EN); /* enable rx and tx */
-}
-
-void
-putDebugChar(unsigned char c)
-{
- if (!duart_initialized) {
- duart_initialized = 1;
- duart_init(CLK_DIVISOR, DATA_BITS, PARITY, STOP_BITS);
- }
- while ((duart_in(R_DUART_STATUS) & M_DUART_TX_RDY) == 0);
- duart_out(R_DUART_TX_HOLD, c);
-}
-
-unsigned char
-getDebugChar(void)
-{
- if (!duart_initialized) {
- duart_initialized = 1;
- duart_init(CLK_DIVISOR, DATA_BITS, PARITY, STOP_BITS);
- }
- while ((duart_in(R_DUART_STATUS) & M_DUART_RX_RDY) == 0) ;
- return duart_in(R_DUART_RX_HOLD);
-}
-
diff -puN /dev/null include/asm-mips/kdebug.h
--- /dev/null 2004-10-25 00:35:20.587727328 -0700
+++ linux-2.6.10-rc1-trini/include/asm-mips/kdebug.h 2004-10-29 11:26:45.214272071 -0700
@@ -0,0 +1,47 @@
+/*
+ *
+ * Copyright (C) 2004 MontaVista Software Inc.
+ * Author: Manish Lachwani, mlachwani@xxxxxxxxxx or manish@xxxxxxxxxxxxxxxx
+ *
+ * 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.
+ *
+ */
+#ifndef _MIPS_KDEBUG_H
+#define _MIPS_KDEBUG_H
+
+#include <linux/notifier.h>
+
+struct pt_regs;
+
+struct die_args {
+ struct pt_regs *regs;
+ const char *str;
+ long err;
+};
+
+int register_die_notifier(struct notifier_block *nb);
+extern struct notifier_block *mips_die_chain;
+
+enum die_val {
+ DIE_OOPS = 1,
+ DIE_PANIC,
+ DIE_DIE,
+ DIE_KERNELDEBUG,
+ DIE_TRAP,
+ DIE_PAGE_FAULT,
+};
+
+/*
+ * trap number can be computed from regs and signr can be computed using
+ * compute_signal()
+ */
+static inline int notify_die(enum die_val val,char *str,struct pt_regs *regs,long err)
+{
+ struct die_args args = { .regs=regs, .str=str, .err=err };
+ return notifier_call_chain(&mips_die_chain, val, &args);
+}
+
+#endif /* _MIPS_KDEBUG_H */
diff -puN /dev/null include/asm-mips/kgdb.h
--- /dev/null 2004-10-25 00:35:20.587727328 -0700
+++ linux-2.6.10-rc1-trini/include/asm-mips/kgdb.h 2004-10-29 11:26:45.214272071 -0700
@@ -0,0 +1,20 @@
+#ifndef _ASM_KGDB_H_
+#define _ASM_KGDB_H_
+
+#include <linux/config.h>
+
+#define BUFMAX 2048
+#define NUMREGBYTES (90*sizeof(long))
+#define BREAK_INSTR_SIZE 4
+
+#define BREAKPOINT() __asm__ __volatile__ ( \
+ ".globl breakinst\n\t" \
+ ".set\tnoreorder\n\t" \
+ "nop\n" \
+ "breakinst:\tbreak\n\t" \
+ "nop\n\t" \
+ ".set\treorder")
+
+#define CHECK_EXCEPTION_STACK() 1
+
+#endif /* _ASM_KGDB_H_ */
diff -puN lib/Kconfig.debug~mips-lite lib/Kconfig.debug
--- linux-2.6.10-rc1/lib/Kconfig.debug~mips-lite 2004-10-29 11:26:45.200275358 -0700
+++ linux-2.6.10-rc1-trini/lib/Kconfig.debug 2004-10-29 11:32:56.134154345 -0700
@@ -115,7 +115,7 @@ endif

config KGDB
bool "KGDB: kernel debugging with remote gdb"
- depends on DEBUG_KERNEL && (X86 || ((!SMP || BROKEN) && (PPC32)))
+ depends on DEBUG_KERNEL && (X86 || MIPS32 || ((!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
@@ -128,6 +128,7 @@ config KGDB
choice
prompt "Method for KGDB communication"
depends on KGDB
+ default KGDB_SIBYTE if SIBYTE_SB1xxx_SOC
default KGDB_8250
help
There are a number of different ways in which you can communicate
@@ -140,6 +141,10 @@ config KGDB_8250
Uses generic serial port (8250) for kgdb. This is independent of the
option 9250/16550 and compatible serial port.

+config KGDB_SIBYTE
+ bool "KGDB: On the Broadcom SWARM serial port"
+ depends on MIPS && SIBYTE_SB1xxx_SOC
+
endchoice

config KGDB_SIMPLE_SERIAL
@@ -153,7 +158,7 @@ config KGDB_SIMPLE_SERIAL
If in doubt, say Y.

choice
- depends on KGDB_8250
+ depends on KGDB_8250 || KGDB_SIBYTE
prompt "Debug serial port BAUD"
default KGDB_115200BAUD
help
_
-
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