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1275 |
phoenix |
/*
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* ppc-stub.c: KGDB support for the Linux kernel.
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*
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* adapted from arch/sparc/kernel/sparc-stub.c for the PowerPC
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* some stuff borrowed from Paul Mackerras' xmon
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* Copyright (C) 1998 Michael AK Tesch (tesch@cs.wisc.edu)
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*
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* Modifications to run under Linux
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*
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* This file originally came from the gdb sources, and the
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* copyright notices have been retained below.
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*/
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/****************************************************************************
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THIS SOFTWARE IS NOT COPYRIGHTED
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HP offers the following for use in the public domain. HP makes no
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warranty with regard to the software or its performance and the
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user accepts the software "AS IS" with all faults.
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HP DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WITH REGARD
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TO THIS SOFTWARE INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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****************************************************************************/
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/****************************************************************************
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* Header: remcom.c,v 1.34 91/03/09 12:29:49 glenne Exp $
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*
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* Module name: remcom.c $
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* Revision: 1.34 $
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* Date: 91/03/09 12:29:49 $
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* Contributor: Lake Stevens Instrument Division$
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*
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* Description: low level support for gdb debugger. $
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*
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* Considerations: only works on target hardware $
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*
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* Written by: Glenn Engel $
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* ModuleState: Experimental $
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*
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* NOTES: See Below $
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*
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* Modified for SPARC by Stu Grossman, Cygnus Support.
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*
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* This code has been extensively tested on the Fujitsu SPARClite demo board.
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*
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* To enable debugger support, two things need to happen. One, a
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* call to set_debug_traps() is necessary in order to allow any breakpoints
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* or error conditions to be properly intercepted and reported to gdb.
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* Two, a breakpoint needs to be generated to begin communication. This
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* is most easily accomplished by a call to breakpoint(). Breakpoint()
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* simulates a breakpoint by executing a trap #1.
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*
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*************
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*
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* The following gdb commands are supported:
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*
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* command function Return value
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*
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* g return the value of the CPU registers hex data or ENN
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* G set the value of the CPU registers OK or ENN
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* qOffsets Get section offsets. Reply is Text=xxx;Data=yyy;Bss=zzz
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*
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* mAA..AA,LLLL Read LLLL bytes at address AA..AA hex data or ENN
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* MAA..AA,LLLL: Write LLLL bytes at address AA.AA OK or ENN
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*
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* c Resume at current address SNN ( signal NN)
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* cAA..AA Continue at address AA..AA SNN
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*
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* s Step one instruction SNN
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* sAA..AA Step one instruction from AA..AA SNN
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*
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* k kill
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*
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* ? What was the last sigval ? SNN (signal NN)
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*
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* bBB..BB Set baud rate to BB..BB OK or BNN, then sets
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* baud rate
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*
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* All commands and responses are sent with a packet which includes a
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* checksum. A packet consists of
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*
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* $<packet info>#<checksum>.
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*
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* where
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* <packet info> :: <characters representing the command or response>
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* <checksum> :: <two hex digits computed as modulo 256 sum of <packetinfo>>
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*
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* When a packet is received, it is first acknowledged with either '+' or '-'.
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* '+' indicates a successful transfer. '-' indicates a failed transfer.
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*
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* Example:
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*
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* Host: Reply:
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* $m0,10#2a +$00010203040506070809101112131415#42
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*
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****************************************************************************/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <asm/system.h>
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#include <asm/signal.h>
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#include <asm/kgdb.h>
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#include <asm/pgtable.h>
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#include <asm/ptrace.h>
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void breakinst(void);
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/*
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* BUFMAX defines the maximum number of characters in inbound/outbound buffers
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* at least NUMREGBYTES*2 are needed for register packets
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*/
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#define BUFMAX 2048
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static char remcomInBuffer[BUFMAX];
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static char remcomOutBuffer[BUFMAX];
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static int initialized = 0;
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static int kgdb_active = 0;
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static int kgdb_started = 0;
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static u_int fault_jmp_buf[100];
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static int kdebug;
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static const char hexchars[]="0123456789abcdef";
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/* Place where we save old trap entries for restoration - sparc*/
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/* struct tt_entry kgdb_savettable[256]; */
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/* typedef void (*trapfunc_t)(void); */
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#if 0
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/* Install an exception handler for kgdb */
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static void exceptionHandler(int tnum, unsigned int *tfunc)
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{
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/* We are dorking with a live trap table, all irqs off */
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}
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#endif
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int
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kgdb_setjmp(long *buf)
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{
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asm ("mflr 0; stw 0,0(%0);"
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"stw 1,4(%0); stw 2,8(%0);"
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"mfcr 0; stw 0,12(%0);"
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"stmw 13,16(%0)"
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: : "r" (buf));
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/* XXX should save fp regs as well */
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return 0;
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}
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void
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kgdb_longjmp(long *buf, int val)
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| 158 |
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{
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| 159 |
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if (val == 0)
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| 160 |
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val = 1;
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asm ("lmw 13,16(%0);"
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"lwz 0,12(%0); mtcrf 0x38,0;"
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"lwz 0,0(%0); lwz 1,4(%0); lwz 2,8(%0);"
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"mtlr 0; mr 3,%1"
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: : "r" (buf), "r" (val));
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}
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/* Convert ch from a hex digit to an int */
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static int
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| 169 |
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hex(unsigned char ch)
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| 170 |
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{
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| 171 |
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if (ch >= 'a' && ch <= 'f')
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| 172 |
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return ch-'a'+10;
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| 173 |
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if (ch >= '0' && ch <= '9')
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| 174 |
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return ch-'0';
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| 175 |
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if (ch >= 'A' && ch <= 'F')
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| 176 |
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return ch-'A'+10;
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| 177 |
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return -1;
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| 178 |
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}
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| 179 |
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| 180 |
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/* Convert the memory pointed to by mem into hex, placing result in buf.
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* Return a pointer to the last char put in buf (null), in case of mem fault,
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* return 0.
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| 183 |
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*/
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| 184 |
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static unsigned char *
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| 185 |
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mem2hex(char *mem, char *buf, int count)
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{
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| 187 |
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unsigned char ch;
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| 189 |
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if (kgdb_setjmp((long*)fault_jmp_buf) == 0) {
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debugger_fault_handler = kgdb_fault_handler;
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while (count-- > 0) {
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| 192 |
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ch = *mem++;
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*buf++ = hexchars[ch >> 4];
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| 194 |
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*buf++ = hexchars[ch & 0xf];
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| 195 |
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}
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| 196 |
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} else {
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| 197 |
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/* error condition */
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| 198 |
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}
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| 199 |
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debugger_fault_handler = 0;
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| 200 |
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*buf = 0;
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| 201 |
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return buf;
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| 202 |
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}
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| 203 |
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| 204 |
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/* convert the hex array pointed to by buf into binary to be placed in mem
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| 205 |
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* return a pointer to the character AFTER the last byte written.
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| 206 |
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*/
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| 207 |
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static char *
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| 208 |
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hex2mem(char *buf, char *mem, int count)
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| 209 |
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{
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| 210 |
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int i;
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| 211 |
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unsigned char ch;
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| 212 |
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| 213 |
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if (kgdb_setjmp((long*)fault_jmp_buf) == 0) {
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| 214 |
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debugger_fault_handler = kgdb_fault_handler;
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| 215 |
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for (i=0; i<count; i++) {
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| 216 |
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ch = hex(*buf++) << 4;
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| 217 |
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ch |= hex(*buf++);
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| 218 |
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*mem++ = ch;
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| 219 |
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}
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| 220 |
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flush_icache_range((int)mem, (int)mem+count);
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| 221 |
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} else {
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| 222 |
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/* error condition */
|
| 223 |
|
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}
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| 224 |
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debugger_fault_handler = 0;
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| 225 |
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return mem;
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| 226 |
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}
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| 227 |
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| 228 |
|
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/*
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| 229 |
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* While we find nice hex chars, build an int.
|
| 230 |
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* Return number of chars processed.
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| 231 |
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*/
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| 232 |
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static int
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| 233 |
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hexToInt(char **ptr, int *intValue)
|
| 234 |
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{
|
| 235 |
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int numChars = 0;
|
| 236 |
|
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int hexValue;
|
| 237 |
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|
| 238 |
|
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*intValue = 0;
|
| 239 |
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| 240 |
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if (kgdb_setjmp((long*)fault_jmp_buf) == 0) {
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| 241 |
|
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debugger_fault_handler = kgdb_fault_handler;
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| 242 |
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while (**ptr) {
|
| 243 |
|
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hexValue = hex(**ptr);
|
| 244 |
|
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if (hexValue < 0)
|
| 245 |
|
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break;
|
| 246 |
|
|
|
| 247 |
|
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*intValue = (*intValue << 4) | hexValue;
|
| 248 |
|
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numChars ++;
|
| 249 |
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|
| 250 |
|
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(*ptr)++;
|
| 251 |
|
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}
|
| 252 |
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} else {
|
| 253 |
|
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/* error condition */
|
| 254 |
|
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}
|
| 255 |
|
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debugger_fault_handler = 0;
|
| 256 |
|
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|
| 257 |
|
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return (numChars);
|
| 258 |
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}
|
| 259 |
|
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|
| 260 |
|
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/* scan for the sequence $<data>#<checksum> */
|
| 261 |
|
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static void
|
| 262 |
|
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getpacket(char *buffer)
|
| 263 |
|
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{
|
| 264 |
|
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unsigned char checksum;
|
| 265 |
|
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unsigned char xmitcsum;
|
| 266 |
|
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int i;
|
| 267 |
|
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int count;
|
| 268 |
|
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unsigned char ch;
|
| 269 |
|
|
|
| 270 |
|
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do {
|
| 271 |
|
|
/* wait around for the start character, ignore all other
|
| 272 |
|
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* characters */
|
| 273 |
|
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while ((ch = (getDebugChar() & 0x7f)) != '$') ;
|
| 274 |
|
|
|
| 275 |
|
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checksum = 0;
|
| 276 |
|
|
xmitcsum = -1;
|
| 277 |
|
|
|
| 278 |
|
|
count = 0;
|
| 279 |
|
|
|
| 280 |
|
|
/* now, read until a # or end of buffer is found */
|
| 281 |
|
|
while (count < BUFMAX) {
|
| 282 |
|
|
ch = getDebugChar() & 0x7f;
|
| 283 |
|
|
if (ch == '#')
|
| 284 |
|
|
break;
|
| 285 |
|
|
checksum = checksum + ch;
|
| 286 |
|
|
buffer[count] = ch;
|
| 287 |
|
|
count = count + 1;
|
| 288 |
|
|
}
|
| 289 |
|
|
|
| 290 |
|
|
if (count >= BUFMAX)
|
| 291 |
|
|
continue;
|
| 292 |
|
|
|
| 293 |
|
|
buffer[count] = 0;
|
| 294 |
|
|
|
| 295 |
|
|
if (ch == '#') {
|
| 296 |
|
|
xmitcsum = hex(getDebugChar() & 0x7f) << 4;
|
| 297 |
|
|
xmitcsum |= hex(getDebugChar() & 0x7f);
|
| 298 |
|
|
if (checksum != xmitcsum)
|
| 299 |
|
|
putDebugChar('-'); /* failed checksum */
|
| 300 |
|
|
else {
|
| 301 |
|
|
putDebugChar('+'); /* successful transfer */
|
| 302 |
|
|
/* if a sequence char is present, reply the ID */
|
| 303 |
|
|
if (buffer[2] == ':') {
|
| 304 |
|
|
putDebugChar(buffer[0]);
|
| 305 |
|
|
putDebugChar(buffer[1]);
|
| 306 |
|
|
/* remove sequence chars from buffer */
|
| 307 |
|
|
count = strlen(buffer);
|
| 308 |
|
|
for (i=3; i <= count; i++)
|
| 309 |
|
|
buffer[i-3] = buffer[i];
|
| 310 |
|
|
}
|
| 311 |
|
|
}
|
| 312 |
|
|
}
|
| 313 |
|
|
} while (checksum != xmitcsum);
|
| 314 |
|
|
}
|
| 315 |
|
|
|
| 316 |
|
|
/* send the packet in buffer. */
|
| 317 |
|
|
static void putpacket(unsigned char *buffer)
|
| 318 |
|
|
{
|
| 319 |
|
|
unsigned char checksum;
|
| 320 |
|
|
int count;
|
| 321 |
|
|
unsigned char ch, recv;
|
| 322 |
|
|
|
| 323 |
|
|
/* $<packet info>#<checksum>. */
|
| 324 |
|
|
do {
|
| 325 |
|
|
putDebugChar('$');
|
| 326 |
|
|
checksum = 0;
|
| 327 |
|
|
count = 0;
|
| 328 |
|
|
|
| 329 |
|
|
while ((ch = buffer[count])) {
|
| 330 |
|
|
putDebugChar(ch);
|
| 331 |
|
|
checksum += ch;
|
| 332 |
|
|
count += 1;
|
| 333 |
|
|
}
|
| 334 |
|
|
|
| 335 |
|
|
putDebugChar('#');
|
| 336 |
|
|
putDebugChar(hexchars[checksum >> 4]);
|
| 337 |
|
|
putDebugChar(hexchars[checksum & 0xf]);
|
| 338 |
|
|
recv = getDebugChar();
|
| 339 |
|
|
} while ((recv & 0x7f) != '+');
|
| 340 |
|
|
}
|
| 341 |
|
|
|
| 342 |
|
|
static void kgdb_flush_cache_all(void)
|
| 343 |
|
|
{
|
| 344 |
|
|
flush_instruction_cache();
|
| 345 |
|
|
}
|
| 346 |
|
|
|
| 347 |
|
|
|
| 348 |
|
|
/* Set up exception handlers for tracing and breakpoints
|
| 349 |
|
|
* [could be called kgdb_init()]
|
| 350 |
|
|
*/
|
| 351 |
|
|
void set_debug_traps(void)
|
| 352 |
|
|
{
|
| 353 |
|
|
#if 0
|
| 354 |
|
|
unsigned char c;
|
| 355 |
|
|
|
| 356 |
|
|
save_and_cli(flags);
|
| 357 |
|
|
|
| 358 |
|
|
/* In case GDB is started before us, ack any packets (presumably
|
| 359 |
|
|
* "$?#xx") sitting there.
|
| 360 |
|
|
*
|
| 361 |
|
|
* I've found this code causes more problems than it solves,
|
| 362 |
|
|
* so that's why it's commented out. GDB seems to work fine
|
| 363 |
|
|
* now starting either before or after the kernel -bwb
|
| 364 |
|
|
*/
|
| 365 |
|
|
|
| 366 |
|
|
while((c = getDebugChar()) != '$');
|
| 367 |
|
|
while((c = getDebugChar()) != '#');
|
| 368 |
|
|
c = getDebugChar(); /* eat first csum byte */
|
| 369 |
|
|
c = getDebugChar(); /* eat second csum byte */
|
| 370 |
|
|
putDebugChar('+'); /* ack it */
|
| 371 |
|
|
#endif
|
| 372 |
|
|
debugger = kgdb;
|
| 373 |
|
|
debugger_bpt = kgdb_bpt;
|
| 374 |
|
|
debugger_sstep = kgdb_sstep;
|
| 375 |
|
|
debugger_iabr_match = kgdb_iabr_match;
|
| 376 |
|
|
debugger_dabr_match = kgdb_dabr_match;
|
| 377 |
|
|
|
| 378 |
|
|
initialized = 1;
|
| 379 |
|
|
}
|
| 380 |
|
|
|
| 381 |
|
|
static void kgdb_fault_handler(struct pt_regs *regs)
|
| 382 |
|
|
{
|
| 383 |
|
|
kgdb_longjmp((long*)fault_jmp_buf, 1);
|
| 384 |
|
|
}
|
| 385 |
|
|
|
| 386 |
|
|
int kgdb_bpt(struct pt_regs *regs)
|
| 387 |
|
|
{
|
| 388 |
|
|
handle_exception(regs);
|
| 389 |
|
|
return 1;
|
| 390 |
|
|
}
|
| 391 |
|
|
|
| 392 |
|
|
int kgdb_sstep(struct pt_regs *regs)
|
| 393 |
|
|
{
|
| 394 |
|
|
handle_exception(regs);
|
| 395 |
|
|
return 1;
|
| 396 |
|
|
}
|
| 397 |
|
|
|
| 398 |
|
|
void kgdb(struct pt_regs *regs)
|
| 399 |
|
|
{
|
| 400 |
|
|
handle_exception(regs);
|
| 401 |
|
|
}
|
| 402 |
|
|
|
| 403 |
|
|
int kgdb_iabr_match(struct pt_regs *regs)
|
| 404 |
|
|
{
|
| 405 |
|
|
printk("kgdb doesn't support iabr, what?!?\n");
|
| 406 |
|
|
handle_exception(regs);
|
| 407 |
|
|
return 1;
|
| 408 |
|
|
}
|
| 409 |
|
|
|
| 410 |
|
|
int kgdb_dabr_match(struct pt_regs *regs)
|
| 411 |
|
|
{
|
| 412 |
|
|
printk("kgdb doesn't support dabr, what?!?\n");
|
| 413 |
|
|
handle_exception(regs);
|
| 414 |
|
|
return 1;
|
| 415 |
|
|
}
|
| 416 |
|
|
|
| 417 |
|
|
/* Convert the SPARC hardware trap type code to a unix signal number. */
|
| 418 |
|
|
/*
|
| 419 |
|
|
* This table contains the mapping between PowerPC hardware trap types, and
|
| 420 |
|
|
* signals, which are primarily what GDB understands.
|
| 421 |
|
|
*/
|
| 422 |
|
|
static struct hard_trap_info
|
| 423 |
|
|
{
|
| 424 |
|
|
unsigned int tt; /* Trap type code for powerpc */
|
| 425 |
|
|
unsigned char signo; /* Signal that we map this trap into */
|
| 426 |
|
|
} hard_trap_info[] = {
|
| 427 |
|
|
{ 0x200, SIGSEGV }, /* machine check */
|
| 428 |
|
|
{ 0x300, SIGSEGV }, /* address error (store) */
|
| 429 |
|
|
{ 0x400, SIGBUS }, /* instruction bus error */
|
| 430 |
|
|
{ 0x500, SIGINT }, /* interrupt */
|
| 431 |
|
|
{ 0x600, SIGBUS }, /* alingment */
|
| 432 |
|
|
{ 0x700, SIGTRAP }, /* breakpoint trap */
|
| 433 |
|
|
{ 0x800, SIGFPE }, /* fpu unavail */
|
| 434 |
|
|
{ 0x900, SIGALRM }, /* decrementer */
|
| 435 |
|
|
{ 0xa00, SIGILL }, /* reserved */
|
| 436 |
|
|
{ 0xb00, SIGILL }, /* reserved */
|
| 437 |
|
|
{ 0xc00, SIGCHLD }, /* syscall */
|
| 438 |
|
|
{ 0xd00, SIGTRAP }, /* single-step/watch */
|
| 439 |
|
|
{ 0xe00, SIGFPE }, /* fp assist */
|
| 440 |
|
|
{ 0, 0} /* Must be last */
|
| 441 |
|
|
};
|
| 442 |
|
|
|
| 443 |
|
|
static int computeSignal(unsigned int tt)
|
| 444 |
|
|
{
|
| 445 |
|
|
struct hard_trap_info *ht;
|
| 446 |
|
|
|
| 447 |
|
|
for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
|
| 448 |
|
|
if (ht->tt == tt)
|
| 449 |
|
|
return ht->signo;
|
| 450 |
|
|
|
| 451 |
|
|
return SIGHUP; /* default for things we don't know about */
|
| 452 |
|
|
}
|
| 453 |
|
|
|
| 454 |
|
|
#define PC_REGNUM 64
|
| 455 |
|
|
#define SP_REGNUM 1
|
| 456 |
|
|
|
| 457 |
|
|
/*
|
| 458 |
|
|
* This function does all command processing for interfacing to gdb.
|
| 459 |
|
|
*/
|
| 460 |
|
|
static void
|
| 461 |
|
|
handle_exception (struct pt_regs *regs)
|
| 462 |
|
|
{
|
| 463 |
|
|
int sigval;
|
| 464 |
|
|
int addr;
|
| 465 |
|
|
int length;
|
| 466 |
|
|
char *ptr;
|
| 467 |
|
|
unsigned long msr;
|
| 468 |
|
|
|
| 469 |
|
|
if (debugger_fault_handler) {
|
| 470 |
|
|
debugger_fault_handler(regs);
|
| 471 |
|
|
panic("kgdb longjump failed!\n");
|
| 472 |
|
|
}
|
| 473 |
|
|
if (kgdb_active) {
|
| 474 |
|
|
printk("interrupt while in kgdb, returning\n");
|
| 475 |
|
|
return;
|
| 476 |
|
|
}
|
| 477 |
|
|
kgdb_active = 1;
|
| 478 |
|
|
kgdb_started = 1;
|
| 479 |
|
|
|
| 480 |
|
|
#ifdef KGDB_DEBUG
|
| 481 |
|
|
printk("kgdb: entering handle_exception; trap [0x%x]\n",
|
| 482 |
|
|
(unsigned int)regs->trap);
|
| 483 |
|
|
#endif
|
| 484 |
|
|
|
| 485 |
|
|
kgdb_interruptible(0);
|
| 486 |
|
|
lock_kernel();
|
| 487 |
|
|
msr = get_msr();
|
| 488 |
|
|
set_msr(msr & ~MSR_EE); /* disable interrupts */
|
| 489 |
|
|
|
| 490 |
|
|
if (regs->nip == (unsigned long)breakinst) {
|
| 491 |
|
|
/* Skip over breakpoint trap insn */
|
| 492 |
|
|
regs->nip += 4;
|
| 493 |
|
|
}
|
| 494 |
|
|
|
| 495 |
|
|
/* reply to host that an exception has occurred */
|
| 496 |
|
|
sigval = computeSignal(regs->trap);
|
| 497 |
|
|
ptr = remcomOutBuffer;
|
| 498 |
|
|
|
| 499 |
|
|
#if 0
|
| 500 |
|
|
*ptr++ = 'S';
|
| 501 |
|
|
*ptr++ = hexchars[sigval >> 4];
|
| 502 |
|
|
*ptr++ = hexchars[sigval & 0xf];
|
| 503 |
|
|
#else
|
| 504 |
|
|
*ptr++ = 'T';
|
| 505 |
|
|
*ptr++ = hexchars[sigval >> 4];
|
| 506 |
|
|
*ptr++ = hexchars[sigval & 0xf];
|
| 507 |
|
|
*ptr++ = hexchars[PC_REGNUM >> 4];
|
| 508 |
|
|
*ptr++ = hexchars[PC_REGNUM & 0xf];
|
| 509 |
|
|
*ptr++ = ':';
|
| 510 |
|
|
ptr = mem2hex((char *)®s->nip, ptr, 4);
|
| 511 |
|
|
*ptr++ = ';';
|
| 512 |
|
|
*ptr++ = hexchars[SP_REGNUM >> 4];
|
| 513 |
|
|
*ptr++ = hexchars[SP_REGNUM & 0xf];
|
| 514 |
|
|
*ptr++ = ':';
|
| 515 |
|
|
ptr = mem2hex(((char *)®s) + SP_REGNUM*4, ptr, 4);
|
| 516 |
|
|
*ptr++ = ';';
|
| 517 |
|
|
#endif
|
| 518 |
|
|
|
| 519 |
|
|
*ptr++ = 0;
|
| 520 |
|
|
|
| 521 |
|
|
putpacket(remcomOutBuffer);
|
| 522 |
|
|
|
| 523 |
|
|
/* XXX We may want to add some features dealing with poking the
|
| 524 |
|
|
* XXX page tables, ... (look at sparc-stub.c for more info)
|
| 525 |
|
|
* XXX also required hacking to the gdb sources directly...
|
| 526 |
|
|
*/
|
| 527 |
|
|
|
| 528 |
|
|
while (1) {
|
| 529 |
|
|
remcomOutBuffer[0] = 0;
|
| 530 |
|
|
|
| 531 |
|
|
getpacket(remcomInBuffer);
|
| 532 |
|
|
switch (remcomInBuffer[0]) {
|
| 533 |
|
|
case '?': /* report most recent signal */
|
| 534 |
|
|
remcomOutBuffer[0] = 'S';
|
| 535 |
|
|
remcomOutBuffer[1] = hexchars[sigval >> 4];
|
| 536 |
|
|
remcomOutBuffer[2] = hexchars[sigval & 0xf];
|
| 537 |
|
|
remcomOutBuffer[3] = 0;
|
| 538 |
|
|
break;
|
| 539 |
|
|
#if 0
|
| 540 |
|
|
case 'q': /* this screws up gdb for some reason...*/
|
| 541 |
|
|
{
|
| 542 |
|
|
extern long _start, sdata, __bss_start;
|
| 543 |
|
|
|
| 544 |
|
|
ptr = &remcomInBuffer[1];
|
| 545 |
|
|
if (strncmp(ptr, "Offsets", 7) != 0)
|
| 546 |
|
|
break;
|
| 547 |
|
|
|
| 548 |
|
|
ptr = remcomOutBuffer;
|
| 549 |
|
|
sprintf(ptr, "Text=%8.8x;Data=%8.8x;Bss=%8.8x",
|
| 550 |
|
|
&_start, &sdata, &__bss_start);
|
| 551 |
|
|
break;
|
| 552 |
|
|
}
|
| 553 |
|
|
#endif
|
| 554 |
|
|
case 'd':
|
| 555 |
|
|
/* toggle debug flag */
|
| 556 |
|
|
kdebug ^= 1;
|
| 557 |
|
|
break;
|
| 558 |
|
|
|
| 559 |
|
|
case 'g': /* return the value of the CPU registers.
|
| 560 |
|
|
* some of them are non-PowerPC names :(
|
| 561 |
|
|
* they are stored in gdb like:
|
| 562 |
|
|
* struct {
|
| 563 |
|
|
* u32 gpr[32];
|
| 564 |
|
|
* f64 fpr[32];
|
| 565 |
|
|
* u32 pc, ps, cnd, lr; (ps=msr)
|
| 566 |
|
|
* u32 cnt, xer, mq;
|
| 567 |
|
|
* }
|
| 568 |
|
|
*/
|
| 569 |
|
|
{
|
| 570 |
|
|
int i;
|
| 571 |
|
|
ptr = remcomOutBuffer;
|
| 572 |
|
|
/* General Purpose Regs */
|
| 573 |
|
|
ptr = mem2hex((char *)regs, ptr, 32 * 4);
|
| 574 |
|
|
/* Floating Point Regs - FIXME */
|
| 575 |
|
|
/*ptr = mem2hex((char *), ptr, 32 * 8);*/
|
| 576 |
|
|
for(i=0; i<(32*8*2); i++) { /* 2chars/byte */
|
| 577 |
|
|
ptr[i] = '0';
|
| 578 |
|
|
}
|
| 579 |
|
|
ptr += 32*8*2;
|
| 580 |
|
|
/* pc, msr, cr, lr, ctr, xer, (mq is unused) */
|
| 581 |
|
|
ptr = mem2hex((char *)®s->nip, ptr, 4);
|
| 582 |
|
|
ptr = mem2hex((char *)®s->msr, ptr, 4);
|
| 583 |
|
|
ptr = mem2hex((char *)®s->ccr, ptr, 4);
|
| 584 |
|
|
ptr = mem2hex((char *)®s->link, ptr, 4);
|
| 585 |
|
|
ptr = mem2hex((char *)®s->ctr, ptr, 4);
|
| 586 |
|
|
ptr = mem2hex((char *)®s->xer, ptr, 4);
|
| 587 |
|
|
}
|
| 588 |
|
|
break;
|
| 589 |
|
|
|
| 590 |
|
|
case 'G': /* set the value of the CPU registers */
|
| 591 |
|
|
{
|
| 592 |
|
|
ptr = &remcomInBuffer[1];
|
| 593 |
|
|
|
| 594 |
|
|
/*
|
| 595 |
|
|
* If the stack pointer has moved, you should pray.
|
| 596 |
|
|
* (cause only god can help you).
|
| 597 |
|
|
*/
|
| 598 |
|
|
|
| 599 |
|
|
/* General Purpose Regs */
|
| 600 |
|
|
hex2mem(ptr, (char *)regs, 32 * 4);
|
| 601 |
|
|
|
| 602 |
|
|
/* Floating Point Regs - FIXME?? */
|
| 603 |
|
|
/*ptr = hex2mem(ptr, ??, 32 * 8);*/
|
| 604 |
|
|
ptr += 32*8*2;
|
| 605 |
|
|
|
| 606 |
|
|
/* pc, msr, cr, lr, ctr, xer, (mq is unused) */
|
| 607 |
|
|
ptr = hex2mem(ptr, (char *)®s->nip, 4);
|
| 608 |
|
|
ptr = hex2mem(ptr, (char *)®s->msr, 4);
|
| 609 |
|
|
ptr = hex2mem(ptr, (char *)®s->ccr, 4);
|
| 610 |
|
|
ptr = hex2mem(ptr, (char *)®s->link, 4);
|
| 611 |
|
|
ptr = hex2mem(ptr, (char *)®s->ctr, 4);
|
| 612 |
|
|
ptr = hex2mem(ptr, (char *)®s->xer, 4);
|
| 613 |
|
|
|
| 614 |
|
|
strcpy(remcomOutBuffer,"OK");
|
| 615 |
|
|
}
|
| 616 |
|
|
break;
|
| 617 |
|
|
case 'H':
|
| 618 |
|
|
/* don't do anything, yet, just acknowledge */
|
| 619 |
|
|
hexToInt(&ptr, &addr);
|
| 620 |
|
|
strcpy(remcomOutBuffer,"OK");
|
| 621 |
|
|
break;
|
| 622 |
|
|
|
| 623 |
|
|
case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
|
| 624 |
|
|
/* Try to read %x,%x. */
|
| 625 |
|
|
|
| 626 |
|
|
ptr = &remcomInBuffer[1];
|
| 627 |
|
|
|
| 628 |
|
|
if (hexToInt(&ptr, &addr)
|
| 629 |
|
|
&& *ptr++ == ','
|
| 630 |
|
|
&& hexToInt(&ptr, &length)) {
|
| 631 |
|
|
if (mem2hex((char *)addr, remcomOutBuffer,length))
|
| 632 |
|
|
break;
|
| 633 |
|
|
strcpy (remcomOutBuffer, "E03");
|
| 634 |
|
|
} else {
|
| 635 |
|
|
strcpy(remcomOutBuffer,"E01");
|
| 636 |
|
|
}
|
| 637 |
|
|
break;
|
| 638 |
|
|
|
| 639 |
|
|
case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */
|
| 640 |
|
|
/* Try to read '%x,%x:'. */
|
| 641 |
|
|
|
| 642 |
|
|
ptr = &remcomInBuffer[1];
|
| 643 |
|
|
|
| 644 |
|
|
if (hexToInt(&ptr, &addr)
|
| 645 |
|
|
&& *ptr++ == ','
|
| 646 |
|
|
&& hexToInt(&ptr, &length)
|
| 647 |
|
|
&& *ptr++ == ':') {
|
| 648 |
|
|
if (hex2mem(ptr, (char *)addr, length)) {
|
| 649 |
|
|
strcpy(remcomOutBuffer, "OK");
|
| 650 |
|
|
} else {
|
| 651 |
|
|
strcpy(remcomOutBuffer, "E03");
|
| 652 |
|
|
}
|
| 653 |
|
|
flush_icache_range(addr, addr+length);
|
| 654 |
|
|
} else {
|
| 655 |
|
|
strcpy(remcomOutBuffer, "E02");
|
| 656 |
|
|
}
|
| 657 |
|
|
break;
|
| 658 |
|
|
|
| 659 |
|
|
|
| 660 |
|
|
case 'k': /* kill the program, actually just continue */
|
| 661 |
|
|
case 'c': /* cAA..AA Continue; address AA..AA optional */
|
| 662 |
|
|
/* try to read optional parameter, pc unchanged if no parm */
|
| 663 |
|
|
|
| 664 |
|
|
ptr = &remcomInBuffer[1];
|
| 665 |
|
|
if (hexToInt(&ptr, &addr)) {
|
| 666 |
|
|
regs->nip = addr;
|
| 667 |
|
|
}
|
| 668 |
|
|
|
| 669 |
|
|
/* Need to flush the instruction cache here, as we may have deposited a
|
| 670 |
|
|
* breakpoint, and the icache probably has no way of knowing that a data ref to
|
| 671 |
|
|
* some location may have changed something that is in the instruction cache.
|
| 672 |
|
|
*/
|
| 673 |
|
|
kgdb_flush_cache_all();
|
| 674 |
|
|
set_msr(msr);
|
| 675 |
|
|
kgdb_interruptible(1);
|
| 676 |
|
|
unlock_kernel();
|
| 677 |
|
|
kgdb_active = 0;
|
| 678 |
|
|
return;
|
| 679 |
|
|
|
| 680 |
|
|
case 's':
|
| 681 |
|
|
kgdb_flush_cache_all();
|
| 682 |
|
|
regs->msr |= MSR_SE;
|
| 683 |
|
|
#if 0
|
| 684 |
|
|
set_msr(msr | MSR_SE);
|
| 685 |
|
|
#endif
|
| 686 |
|
|
unlock_kernel();
|
| 687 |
|
|
kgdb_active = 0;
|
| 688 |
|
|
return;
|
| 689 |
|
|
|
| 690 |
|
|
case 'r': /* Reset (if user process..exit ???)*/
|
| 691 |
|
|
panic("kgdb reset.");
|
| 692 |
|
|
break;
|
| 693 |
|
|
} /* switch */
|
| 694 |
|
|
if (remcomOutBuffer[0] && kdebug) {
|
| 695 |
|
|
printk("remcomInBuffer: %s\n", remcomInBuffer);
|
| 696 |
|
|
printk("remcomOutBuffer: %s\n", remcomOutBuffer);
|
| 697 |
|
|
}
|
| 698 |
|
|
/* reply to the request */
|
| 699 |
|
|
putpacket(remcomOutBuffer);
|
| 700 |
|
|
} /* while(1) */
|
| 701 |
|
|
}
|
| 702 |
|
|
|
| 703 |
|
|
/* This function will generate a breakpoint exception. It is used at the
|
| 704 |
|
|
beginning of a program to sync up with a debugger and can be used
|
| 705 |
|
|
otherwise as a quick means to stop program execution and "break" into
|
| 706 |
|
|
the debugger. */
|
| 707 |
|
|
|
| 708 |
|
|
void
|
| 709 |
|
|
breakpoint(void)
|
| 710 |
|
|
{
|
| 711 |
|
|
if (!initialized) {
|
| 712 |
|
|
printk("breakpoint() called b4 kgdb init\n");
|
| 713 |
|
|
return;
|
| 714 |
|
|
}
|
| 715 |
|
|
|
| 716 |
|
|
asm(" .globl breakinst
|
| 717 |
|
|
breakinst: .long 0x7d821008
|
| 718 |
|
|
");
|
| 719 |
|
|
}
|
| 720 |
|
|
|
| 721 |
|
|
/* Output string in GDB O-packet format if GDB has connected. If nothing
|
| 722 |
|
|
output, returns 0 (caller must then handle output). */
|
| 723 |
|
|
int
|
| 724 |
|
|
kgdb_output_string (const char* s, unsigned int count)
|
| 725 |
|
|
{
|
| 726 |
|
|
char buffer[512];
|
| 727 |
|
|
|
| 728 |
|
|
if (!kgdb_started)
|
| 729 |
|
|
return 0;
|
| 730 |
|
|
|
| 731 |
|
|
count = (count <= (sizeof(buffer) / 2 - 2))
|
| 732 |
|
|
? count : (sizeof(buffer) / 2 - 2);
|
| 733 |
|
|
|
| 734 |
|
|
buffer[0] = 'O';
|
| 735 |
|
|
mem2hex (s, &buffer[1], count);
|
| 736 |
|
|
putpacket(buffer);
|
| 737 |
|
|
|
| 738 |
|
|
return 1;
|
| 739 |
|
|
}
|
