📄 mips-lite.patch
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This adds basic support to the MIPS architecture as well as supportspecifically for the MIPS Malta (via 8250) and SiByte 1250-SWARM(32 and 64bit, custom uart), all from Manish Lachwani. This looks like itshould work on anything with an 8250-compatible uart, and be fairly easyto convert other boards with custom uarts. This also adds the base functionsfor debugging into the serial_txx9 driver, from Ralf.Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>Signed-off-by: Tom Rini <trini@kernel.crashing.org> arch/mips/Kconfig.debug | 19 arch/mips/kernel/Makefile | 3 arch/mips/kernel/gdb-low.S | 369 ---------- arch/mips/kernel/gdb-stub.c | 1096 ------------------------------ arch/mips/kernel/irq.c | 32 arch/mips/kernel/kgdb-jmp.c | 116 +++ arch/mips/kernel/kgdb-setjmp.S | 28 arch/mips/kernel/kgdb.c | 297 ++++++++ arch/mips/kernel/kgdb_handler.S | 57 + arch/mips/kernel/traps.c | 24 arch/mips/mips-boards/generic/Makefile | 1 arch/mips/mips-boards/generic/init.c | 62 - arch/mips/mips-boards/malta/malta_setup.c | 8 arch/mips/mm/extable.c | 7 arch/mips/sibyte/cfe/setup.c | 14 arch/mips/sibyte/sb1250/Makefile | 1 arch/mips/sibyte/sb1250/irq.c | 59 - arch/mips/sibyte/sb1250/irq_handler.S | 2 arch/mips/sibyte/sb1250/kgdb_sibyte.c | 164 ++++ arch/mips/sibyte/swarm/Makefile | 2 arch/mips/sibyte/swarm/dbg_io.c | 76 -- arch/mips/tx4938/common/Makefile | 2 drivers/serial/serial_txx9.c | 90 ++ include/asm-mips/kdebug.h | 47 + include/asm-mips/kgdb.h | 29 lib/Kconfig.debug | 7 26 files changed, 889 insertions(+), 1723 deletions(-)Index: linux-2.6.16/drivers/serial/serial_txx9.c===================================================================--- linux-2.6.16.orig/drivers/serial/serial_txx9.c 2006-03-20 00:53:29.000000000 -0500+++ linux-2.6.16/drivers/serial/serial_txx9.c 2006-04-25 08:01:03.942041168 -0400@@ -1174,6 +1174,96 @@ MODULE_DEVICE_TABLE(pci, serial_txx9_pci_tbl); #endif /* ENABLE_SERIAL_TXX9_PCI */ +/******************************************************************************/+/* BEG: KDBG Routines */+/******************************************************************************/++#ifdef CONFIG_KGDB+int kgdb_init_count = 0;++void txx9_sio_kgdb_hook(unsigned int port, unsigned int baud_rate)+{+ static struct resource kgdb_resource;+ int ret;+ struct uart_txx9_port *up = &serial_txx9_ports[port];++ /* prevent initialization by driver */+ kgdb_resource.name = "serial_txx9(debug)";+ kgdb_resource.start = (unsigned long)up->port.membase;+ kgdb_resource.end = (unsigned long)(up->port.membase + 36 - 1);+ kgdb_resource.flags = IORESOURCE_MEM | IORESOURCE_BUSY;++ ret = request_resource(&iomem_resource, &kgdb_resource);+ if(ret == -EBUSY)+ printk(" serial_txx9(debug): request_resource failed\n");++ return;+}+void+txx9_sio_kdbg_init( unsigned int port_number )+{+ if (port_number == 1) {+ txx9_sio_kgdb_hook(port_number, 38400);+ } else {+ printk("Bad Port Number [%u] != [1]\n",port_number);+ }+ return;+}++u8+txx9_sio_kdbg_rd( void )+{+ unsigned int status,ch;+ struct uart_txx9_port *up = &serial_txx9_ports[1];++ if (kgdb_init_count == 0) {+ txx9_sio_kdbg_init(1);+ kgdb_init_count = 1;+ }++ while (1) {+ status = sio_in(up, TXX9_SIDISR);+ if ( status & 0x1f ) {+ ch = sio_in(up, TXX9_SIRFIFO );+ break;+ }+ }++ return (ch);+}++int+txx9_sio_kdbg_wr( u8 ch )+{+ unsigned int status;+ struct uart_txx9_port *up = &serial_txx9_ports[1];++ if (kgdb_init_count == 0) {+ txx9_sio_kdbg_init(1);+ kgdb_init_count = 1;+ }++ while (1) {+ status = sio_in(up, TXX9_SICISR);+ if (status & TXX9_SICISR_TRDY) {+ if ( ch == '\n' ) {+ txx9_sio_kdbg_wr( '\r' );+ }+ sio_out(up, TXX9_SITFIFO, (u32)ch );++ break;+ }+ }++ return (1);+}+#endif /* CONFIG_KGDB */+++/******************************************************************************/+/* END: KDBG Routines */+/******************************************************************************/+ static int __init serial_txx9_init(void) { int ret;Index: linux-2.6.16/lib/Kconfig.debug===================================================================--- linux-2.6.16.orig/lib/Kconfig.debug 2006-04-25 08:01:02.886201680 -0400+++ linux-2.6.16/lib/Kconfig.debug 2006-04-25 08:01:04.012030528 -0400@@ -232,7 +232,7 @@ config KGDB bool "KGDB: kernel debugging with remote gdb" select WANT_EXTRA_DEBUG_INFORMATION- depends on DEBUG_KERNEL && (X86 || PPC)+ depends on DEBUG_KERNEL && (X86 || MIPS || PPC) help If you say Y here, it will be possible to remotely debug the kernel using gdb. It is strongly suggested that you enable@@ -260,6 +260,7 @@ default KGDB_8250_NOMODULE default KGDB_MPSC if SERIAL_MPSC default KGDB_CPM_UART if (8xx || 8260)+ default KGDB_SIBYTE if SIBYTE_SB1xxx_SOC help There are a number of different ways in which you can communicate with KGDB. The most common is via serial, with the 8250 driver@@ -310,6 +311,10 @@ depends on PPC && (CPM2 || 8xx) help Uses CPM UART to communicate with the host GDB.++config KGDB_SIBYTE+ bool "KGDB: On the Broadcom SWARM serial port"+ depends on MIPS && SIBYTE_SB1xxx_SOC endchoice config KGDBOEIndex: linux-2.6.16/arch/mips/kernel/kgdb-setjmp.S===================================================================--- linux-2.6.16.orig/arch/mips/kernel/kgdb-setjmp.S 2006-04-25 03:03:31.107356424 -0400+++ linux-2.6.16/arch/mips/kernel/kgdb-setjmp.S 2006-04-25 08:01:04.005031592 -0400@@ -0,0 +1,28 @@+/*+ * arch/mips/kernel/kgdb-jmp.c+ *+ * Save and restore system registers so that within a limited frame we+ * may have a fault and "jump back" to a known safe location.+ *+ * Copyright (C) 2005 by MontaVista Software.+ * Author: Manish Lachwani (mlachwani@mvista.com)+ *+ * This file is licensed under the terms of the GNU General Public License+ * version 2. This program as licensed "as is" without any warranty of+ * any kind, whether express or implied.+ */++#include <asm/asm.h>+#include <asm/mipsregs.h>+#include <asm/regdef.h>+#include <asm/stackframe.h>++ .ent kgdb_fault_setjmp,0+ENTRY (kgdb_fault_setjmp)+ move a1, sp+ move a2, fp+#ifdef CONFIG_MIPS64+ nop+#endif+ j kgdb_fault_setjmp_aux+ .end kgdb_fault_setjmpIndex: linux-2.6.16/arch/mips/kernel/gdb-stub.c===================================================================--- linux-2.6.16.orig/arch/mips/kernel/gdb-stub.c 2006-03-20 00:53:29.000000000 -0500+++ linux-2.6.16/arch/mips/kernel/gdb-stub.c 2006-04-25 03:03:31.107356424 -0400@@ -1,1096 +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@waldorf-gmbh.de>- *- * Copyright (C) 1995 Andreas Busse- *- * Copyright (C) 2003 MontaVista Software Inc.- * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net- */--/*- * 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);--int kgdb_enabled;--/*- * spin locks for smp case- */-static DEFINE_SPINLOCK(kgdb_lock);-static raw_spinlock_t kgdb_cpulock[NR_CPUS] = {- [0 ... NR_CPUS-1] = __RAW_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)-{⌨️ 快捷键说明
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