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1624 |
jcastillo |
/* $Id: sparc-stub.c,v 1.1 2005-12-20 09:50:43 jcastillo Exp $
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* sparc-stub.c: KGDB support for the Linux kernel.
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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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*
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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/kernel.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <asm/system.h>
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#include <asm/signal.h>
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#include <asm/oplib.h>
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#include <asm/head.h>
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#include <asm/traps.h>
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#include <asm/system.h>
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#include <asm/vac-ops.h>
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#include <asm/kgdb.h>
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#include <asm/pgtable.h>
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/*
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*
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* external low-level support routines
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*/
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extern void putDebugChar(char); /* write a single character */
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extern char getDebugChar(void); /* read and return a single char */
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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 int initialized = 0; /* !0 means we've been initialized */
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static const char hexchars[]="0123456789abcdef";
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#define NUMREGS 72
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/* Number of bytes of registers. */
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#define NUMREGBYTES (NUMREGS * 4)
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enum regnames {G0, G1, G2, G3, G4, G5, G6, G7,
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O0, O1, O2, O3, O4, O5, SP, O7,
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L0, L1, L2, L3, L4, L5, L6, L7,
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I0, I1, I2, I3, I4, I5, FP, I7,
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F0, F1, F2, F3, F4, F5, F6, F7,
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F8, F9, F10, F11, F12, F13, F14, F15,
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F16, F17, F18, F19, F20, F21, F22, F23,
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F24, F25, F26, F27, F28, F29, F30, F31,
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Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR };
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extern void trap_low(void); /* In arch/sparc/kernel/entry.S */
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unsigned long get_sun4cpte(unsigned long addr)
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{
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unsigned long entry;
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__asm__ __volatile__("\n\tlda [%1] %2, %0\n\t" :
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"=r" (entry) :
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"r" (addr), "i" (ASI_PTE));
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return entry;
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}
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unsigned long get_sun4csegmap(unsigned long addr)
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{
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unsigned long entry;
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| 159 |
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| 160 |
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__asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" :
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"=r" (entry) :
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"r" (addr), "i" (ASI_SEGMAP));
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return entry;
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| 164 |
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}
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| 166 |
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static void flush_cache_all_nop(void)
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{
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| 168 |
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}
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| 169 |
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|
| 170 |
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/* Place where we save old trap entries for restoration */
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| 171 |
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struct tt_entry kgdb_savettable[256];
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| 172 |
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typedef void (*trapfunc_t)(void);
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| 173 |
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|
| 174 |
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/* Helper routine for manipulation of kgdb_savettable */
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| 175 |
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static inline void copy_ttentry(struct tt_entry *src, struct tt_entry *dest)
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{
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| 177 |
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dest->inst_one = src->inst_one;
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| 178 |
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dest->inst_two = src->inst_two;
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| 179 |
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dest->inst_three = src->inst_three;
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| 180 |
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dest->inst_four = src->inst_four;
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| 181 |
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}
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| 182 |
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| 183 |
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/* Initialize the kgdb_savettable so that debugging can commence */
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| 184 |
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static void eh_init(void)
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| 185 |
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{
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| 186 |
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int i, flags;
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| 187 |
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| 188 |
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save_flags(flags); cli();
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for(i=0; i < 256; i++)
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| 190 |
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copy_ttentry(&sparc_ttable[i], &kgdb_savettable[i]);
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| 191 |
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restore_flags(flags);
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| 192 |
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}
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| 193 |
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| 194 |
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/* Install an exception handler for kgdb */
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| 195 |
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static void exceptionHandler(int tnum, trapfunc_t trap_entry)
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| 196 |
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{
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| 197 |
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unsigned long te_addr = (unsigned long) trap_entry;
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| 198 |
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int flags;
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| 199 |
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|
| 200 |
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/* We are dorking with a live trap table, all irqs off */
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| 201 |
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save_flags(flags); cli();
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| 202 |
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|
| 203 |
|
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/* Make new vector */
|
| 204 |
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sparc_ttable[tnum].inst_one =
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| 205 |
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SPARC_BRANCH((unsigned long) te_addr,
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| 206 |
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(unsigned long) &sparc_ttable[tnum].inst_one);
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| 207 |
|
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sparc_ttable[tnum].inst_two = SPARC_RD_PSR_L0;
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| 208 |
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sparc_ttable[tnum].inst_three = SPARC_NOP;
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| 209 |
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sparc_ttable[tnum].inst_four = SPARC_NOP;
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| 210 |
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|
| 211 |
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restore_flags(flags);
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| 212 |
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}
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| 213 |
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|
| 214 |
|
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/* Convert ch from a hex digit to an int */
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| 215 |
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static int
|
| 216 |
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hex(unsigned char ch)
|
| 217 |
|
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{
|
| 218 |
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if (ch >= 'a' && ch <= 'f')
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| 219 |
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return ch-'a'+10;
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| 220 |
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if (ch >= '0' && ch <= '9')
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| 221 |
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return ch-'0';
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| 222 |
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if (ch >= 'A' && ch <= 'F')
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| 223 |
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return ch-'A'+10;
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| 224 |
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return -1;
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| 225 |
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}
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| 226 |
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|
| 227 |
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/* scan for the sequence $<data>#<checksum> */
|
| 228 |
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static void
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| 229 |
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getpacket(char *buffer)
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| 230 |
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{
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| 231 |
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unsigned char checksum;
|
| 232 |
|
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unsigned char xmitcsum;
|
| 233 |
|
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int i;
|
| 234 |
|
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int count;
|
| 235 |
|
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unsigned char ch;
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| 236 |
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|
| 237 |
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do {
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| 238 |
|
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/* wait around for the start character, ignore all other characters */
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| 239 |
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while ((ch = (getDebugChar() & 0x7f)) != '$') ;
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| 240 |
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|
| 241 |
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checksum = 0;
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| 242 |
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xmitcsum = -1;
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| 243 |
|
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|
| 244 |
|
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count = 0;
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| 245 |
|
|
|
| 246 |
|
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/* now, read until a # or end of buffer is found */
|
| 247 |
|
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while (count < BUFMAX) {
|
| 248 |
|
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ch = getDebugChar() & 0x7f;
|
| 249 |
|
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if (ch == '#')
|
| 250 |
|
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break;
|
| 251 |
|
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checksum = checksum + ch;
|
| 252 |
|
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buffer[count] = ch;
|
| 253 |
|
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count = count + 1;
|
| 254 |
|
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}
|
| 255 |
|
|
|
| 256 |
|
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if (count >= BUFMAX)
|
| 257 |
|
|
continue;
|
| 258 |
|
|
|
| 259 |
|
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buffer[count] = 0;
|
| 260 |
|
|
|
| 261 |
|
|
if (ch == '#') {
|
| 262 |
|
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xmitcsum = hex(getDebugChar() & 0x7f) << 4;
|
| 263 |
|
|
xmitcsum |= hex(getDebugChar() & 0x7f);
|
| 264 |
|
|
if (checksum != xmitcsum)
|
| 265 |
|
|
putDebugChar('-'); /* failed checksum */
|
| 266 |
|
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else {
|
| 267 |
|
|
putDebugChar('+'); /* successful transfer */
|
| 268 |
|
|
/* if a sequence char is present, reply the ID */
|
| 269 |
|
|
if (buffer[2] == ':') {
|
| 270 |
|
|
putDebugChar(buffer[0]);
|
| 271 |
|
|
putDebugChar(buffer[1]);
|
| 272 |
|
|
/* remove sequence chars from buffer */
|
| 273 |
|
|
count = strlen(buffer);
|
| 274 |
|
|
for (i=3; i <= count; i++)
|
| 275 |
|
|
buffer[i-3] = buffer[i];
|
| 276 |
|
|
}
|
| 277 |
|
|
}
|
| 278 |
|
|
}
|
| 279 |
|
|
} while (checksum != xmitcsum);
|
| 280 |
|
|
}
|
| 281 |
|
|
|
| 282 |
|
|
/* send the packet in buffer. */
|
| 283 |
|
|
|
| 284 |
|
|
static void
|
| 285 |
|
|
putpacket(unsigned char *buffer)
|
| 286 |
|
|
{
|
| 287 |
|
|
unsigned char checksum;
|
| 288 |
|
|
int count;
|
| 289 |
|
|
unsigned char ch, recv;
|
| 290 |
|
|
|
| 291 |
|
|
/* $<packet info>#<checksum>. */
|
| 292 |
|
|
do {
|
| 293 |
|
|
putDebugChar('$');
|
| 294 |
|
|
checksum = 0;
|
| 295 |
|
|
count = 0;
|
| 296 |
|
|
|
| 297 |
|
|
while ((ch = buffer[count])) {
|
| 298 |
|
|
putDebugChar(ch);
|
| 299 |
|
|
checksum += ch;
|
| 300 |
|
|
count += 1;
|
| 301 |
|
|
}
|
| 302 |
|
|
|
| 303 |
|
|
putDebugChar('#');
|
| 304 |
|
|
putDebugChar(hexchars[checksum >> 4]);
|
| 305 |
|
|
putDebugChar(hexchars[checksum & 0xf]);
|
| 306 |
|
|
recv = getDebugChar();
|
| 307 |
|
|
} while ((recv & 0x7f) != '+');
|
| 308 |
|
|
}
|
| 309 |
|
|
|
| 310 |
|
|
static char remcomInBuffer[BUFMAX];
|
| 311 |
|
|
static char remcomOutBuffer[BUFMAX];
|
| 312 |
|
|
|
| 313 |
|
|
/* Convert the memory pointed to by mem into hex, placing result in buf.
|
| 314 |
|
|
* Return a pointer to the last char put in buf (null), in case of mem fault,
|
| 315 |
|
|
* return 0.
|
| 316 |
|
|
*/
|
| 317 |
|
|
|
| 318 |
|
|
static unsigned char *
|
| 319 |
|
|
mem2hex(char *mem, char *buf, int count)
|
| 320 |
|
|
{
|
| 321 |
|
|
unsigned char ch;
|
| 322 |
|
|
|
| 323 |
|
|
while (count-- > 0) {
|
| 324 |
|
|
ch = *mem++;
|
| 325 |
|
|
*buf++ = hexchars[ch >> 4];
|
| 326 |
|
|
*buf++ = hexchars[ch & 0xf];
|
| 327 |
|
|
}
|
| 328 |
|
|
|
| 329 |
|
|
*buf = 0;
|
| 330 |
|
|
return buf;
|
| 331 |
|
|
}
|
| 332 |
|
|
|
| 333 |
|
|
/* convert the hex array pointed to by buf into binary to be placed in mem
|
| 334 |
|
|
* return a pointer to the character AFTER the last byte written.
|
| 335 |
|
|
*/
|
| 336 |
|
|
static char *
|
| 337 |
|
|
hex2mem(char *buf, char *mem, int count)
|
| 338 |
|
|
{
|
| 339 |
|
|
int i;
|
| 340 |
|
|
unsigned char ch;
|
| 341 |
|
|
|
| 342 |
|
|
for (i=0; i<count; i++) {
|
| 343 |
|
|
|
| 344 |
|
|
ch = hex(*buf++) << 4;
|
| 345 |
|
|
ch |= hex(*buf++);
|
| 346 |
|
|
*mem++ = ch;
|
| 347 |
|
|
}
|
| 348 |
|
|
return mem;
|
| 349 |
|
|
}
|
| 350 |
|
|
|
| 351 |
|
|
/* This table contains the mapping between SPARC hardware trap types, and
|
| 352 |
|
|
signals, which are primarily what GDB understands. It also indicates
|
| 353 |
|
|
which hardware traps we need to commandeer when initializing the stub. */
|
| 354 |
|
|
|
| 355 |
|
|
static struct hard_trap_info
|
| 356 |
|
|
{
|
| 357 |
|
|
unsigned char tt; /* Trap type code for SPARC */
|
| 358 |
|
|
unsigned char signo; /* Signal that we map this trap into */
|
| 359 |
|
|
} hard_trap_info[] = {
|
| 360 |
|
|
{SP_TRAP_SBPT, SIGTRAP}, /* ta 1 - Linux/KGDB software breakpoint */
|
| 361 |
|
|
{0, 0} /* Must be last */
|
| 362 |
|
|
};
|
| 363 |
|
|
|
| 364 |
|
|
/* Set up exception handlers for tracing and breakpoints */
|
| 365 |
|
|
|
| 366 |
|
|
void
|
| 367 |
|
|
set_debug_traps(void)
|
| 368 |
|
|
{
|
| 369 |
|
|
struct hard_trap_info *ht;
|
| 370 |
|
|
unsigned long flags;
|
| 371 |
|
|
unsigned char c;
|
| 372 |
|
|
|
| 373 |
|
|
save_flags(flags); cli();
|
| 374 |
|
|
flush_cache_all = flush_cache_all_nop;
|
| 375 |
|
|
|
| 376 |
|
|
/* Initialize our copy of the Linux Sparc trap table */
|
| 377 |
|
|
eh_init();
|
| 378 |
|
|
|
| 379 |
|
|
for (ht = hard_trap_info; ht->tt && ht->signo; ht++) {
|
| 380 |
|
|
/* Only if it doesn't destroy our fault handlers */
|
| 381 |
|
|
if((ht->tt != SP_TRAP_TFLT) &&
|
| 382 |
|
|
(ht->tt != SP_TRAP_DFLT))
|
| 383 |
|
|
exceptionHandler(ht->tt, trap_low);
|
| 384 |
|
|
}
|
| 385 |
|
|
|
| 386 |
|
|
/* In case GDB is started before us, ack any packets (presumably
|
| 387 |
|
|
* "$?#xx") sitting there.
|
| 388 |
|
|
*/
|
| 389 |
|
|
|
| 390 |
|
|
while((c = getDebugChar()) != '$');
|
| 391 |
|
|
while((c = getDebugChar()) != '#');
|
| 392 |
|
|
c = getDebugChar(); /* eat first csum byte */
|
| 393 |
|
|
c = getDebugChar(); /* eat second csum byte */
|
| 394 |
|
|
putDebugChar('+'); /* ack it */
|
| 395 |
|
|
|
| 396 |
|
|
initialized = 1; /* connect! */
|
| 397 |
|
|
restore_flags(flags);
|
| 398 |
|
|
}
|
| 399 |
|
|
|
| 400 |
|
|
/* Convert the SPARC hardware trap type code to a unix signal number. */
|
| 401 |
|
|
|
| 402 |
|
|
static int
|
| 403 |
|
|
computeSignal(int tt)
|
| 404 |
|
|
{
|
| 405 |
|
|
struct hard_trap_info *ht;
|
| 406 |
|
|
|
| 407 |
|
|
for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
|
| 408 |
|
|
if (ht->tt == tt)
|
| 409 |
|
|
return ht->signo;
|
| 410 |
|
|
|
| 411 |
|
|
return SIGHUP; /* default for things we don't know about */
|
| 412 |
|
|
}
|
| 413 |
|
|
|
| 414 |
|
|
/*
|
| 415 |
|
|
* While we find nice hex chars, build an int.
|
| 416 |
|
|
* Return number of chars processed.
|
| 417 |
|
|
*/
|
| 418 |
|
|
|
| 419 |
|
|
static int
|
| 420 |
|
|
hexToInt(char **ptr, int *intValue)
|
| 421 |
|
|
{
|
| 422 |
|
|
int numChars = 0;
|
| 423 |
|
|
int hexValue;
|
| 424 |
|
|
|
| 425 |
|
|
*intValue = 0;
|
| 426 |
|
|
|
| 427 |
|
|
while (**ptr) {
|
| 428 |
|
|
hexValue = hex(**ptr);
|
| 429 |
|
|
if (hexValue < 0)
|
| 430 |
|
|
break;
|
| 431 |
|
|
|
| 432 |
|
|
*intValue = (*intValue << 4) | hexValue;
|
| 433 |
|
|
numChars ++;
|
| 434 |
|
|
|
| 435 |
|
|
(*ptr)++;
|
| 436 |
|
|
}
|
| 437 |
|
|
|
| 438 |
|
|
return (numChars);
|
| 439 |
|
|
}
|
| 440 |
|
|
|
| 441 |
|
|
/*
|
| 442 |
|
|
* This function does all command processing for interfacing to gdb. It
|
| 443 |
|
|
* returns 1 if you should skip the instruction at the trap address, 0
|
| 444 |
|
|
* otherwise.
|
| 445 |
|
|
*/
|
| 446 |
|
|
|
| 447 |
|
|
extern void breakinst(void);
|
| 448 |
|
|
|
| 449 |
|
|
void
|
| 450 |
|
|
handle_exception (unsigned long *registers)
|
| 451 |
|
|
{
|
| 452 |
|
|
int tt; /* Trap type */
|
| 453 |
|
|
int sigval;
|
| 454 |
|
|
int addr;
|
| 455 |
|
|
int length;
|
| 456 |
|
|
char *ptr;
|
| 457 |
|
|
unsigned long *sp;
|
| 458 |
|
|
|
| 459 |
|
|
/* First, we must force all of the windows to be spilled out */
|
| 460 |
|
|
|
| 461 |
|
|
asm("save %sp, -64, %sp\n\t"
|
| 462 |
|
|
"save %sp, -64, %sp\n\t"
|
| 463 |
|
|
"save %sp, -64, %sp\n\t"
|
| 464 |
|
|
"save %sp, -64, %sp\n\t"
|
| 465 |
|
|
"save %sp, -64, %sp\n\t"
|
| 466 |
|
|
"save %sp, -64, %sp\n\t"
|
| 467 |
|
|
"save %sp, -64, %sp\n\t"
|
| 468 |
|
|
"save %sp, -64, %sp\n\t"
|
| 469 |
|
|
"restore\n\t"
|
| 470 |
|
|
"restore\n\t"
|
| 471 |
|
|
"restore\n\t"
|
| 472 |
|
|
"restore\n\t"
|
| 473 |
|
|
"restore\n\t"
|
| 474 |
|
|
"restore\n\t"
|
| 475 |
|
|
"restore\n\t"
|
| 476 |
|
|
"restore\n\t");
|
| 477 |
|
|
|
| 478 |
|
|
if (registers[PC] == (unsigned long)breakinst) {
|
| 479 |
|
|
/* Skip over breakpoint trap insn */
|
| 480 |
|
|
registers[PC] = registers[NPC];
|
| 481 |
|
|
registers[NPC] += 4;
|
| 482 |
|
|
}
|
| 483 |
|
|
|
| 484 |
|
|
sp = (unsigned long *)registers[SP];
|
| 485 |
|
|
|
| 486 |
|
|
tt = (registers[TBR] >> 4) & 0xff;
|
| 487 |
|
|
|
| 488 |
|
|
/* reply to host that an exception has occurred */
|
| 489 |
|
|
sigval = computeSignal(tt);
|
| 490 |
|
|
ptr = remcomOutBuffer;
|
| 491 |
|
|
|
| 492 |
|
|
*ptr++ = 'T';
|
| 493 |
|
|
*ptr++ = hexchars[sigval >> 4];
|
| 494 |
|
|
*ptr++ = hexchars[sigval & 0xf];
|
| 495 |
|
|
|
| 496 |
|
|
*ptr++ = hexchars[PC >> 4];
|
| 497 |
|
|
*ptr++ = hexchars[PC & 0xf];
|
| 498 |
|
|
*ptr++ = ':';
|
| 499 |
|
|
ptr = mem2hex((char *)®isters[PC], ptr, 4);
|
| 500 |
|
|
*ptr++ = ';';
|
| 501 |
|
|
|
| 502 |
|
|
*ptr++ = hexchars[FP >> 4];
|
| 503 |
|
|
*ptr++ = hexchars[FP & 0xf];
|
| 504 |
|
|
*ptr++ = ':';
|
| 505 |
|
|
ptr = mem2hex((char *) (sp + 8 + 6), ptr, 4); /* FP */
|
| 506 |
|
|
*ptr++ = ';';
|
| 507 |
|
|
|
| 508 |
|
|
*ptr++ = hexchars[SP >> 4];
|
| 509 |
|
|
*ptr++ = hexchars[SP & 0xf];
|
| 510 |
|
|
*ptr++ = ':';
|
| 511 |
|
|
ptr = mem2hex((char *)&sp, ptr, 4);
|
| 512 |
|
|
*ptr++ = ';';
|
| 513 |
|
|
|
| 514 |
|
|
*ptr++ = hexchars[NPC >> 4];
|
| 515 |
|
|
*ptr++ = hexchars[NPC & 0xf];
|
| 516 |
|
|
*ptr++ = ':';
|
| 517 |
|
|
ptr = mem2hex((char *)®isters[NPC], ptr, 4);
|
| 518 |
|
|
*ptr++ = ';';
|
| 519 |
|
|
|
| 520 |
|
|
*ptr++ = hexchars[O7 >> 4];
|
| 521 |
|
|
*ptr++ = hexchars[O7 & 0xf];
|
| 522 |
|
|
*ptr++ = ':';
|
| 523 |
|
|
ptr = mem2hex((char *)®isters[O7], ptr, 4);
|
| 524 |
|
|
*ptr++ = ';';
|
| 525 |
|
|
|
| 526 |
|
|
*ptr++ = 0;
|
| 527 |
|
|
|
| 528 |
|
|
putpacket(remcomOutBuffer);
|
| 529 |
|
|
|
| 530 |
|
|
/* XXX We may want to add some features dealing with poking the
|
| 531 |
|
|
* XXX page tables, the real ones on the srmmu, and what is currently
|
| 532 |
|
|
* XXX loaded in the sun4/sun4c tlb at this point in time. But this
|
| 533 |
|
|
* XXX also required hacking to the gdb sources directly...
|
| 534 |
|
|
*/
|
| 535 |
|
|
|
| 536 |
|
|
while (1) {
|
| 537 |
|
|
remcomOutBuffer[0] = 0;
|
| 538 |
|
|
|
| 539 |
|
|
getpacket(remcomInBuffer);
|
| 540 |
|
|
switch (remcomInBuffer[0]) {
|
| 541 |
|
|
case '?':
|
| 542 |
|
|
remcomOutBuffer[0] = 'S';
|
| 543 |
|
|
remcomOutBuffer[1] = hexchars[sigval >> 4];
|
| 544 |
|
|
remcomOutBuffer[2] = hexchars[sigval & 0xf];
|
| 545 |
|
|
remcomOutBuffer[3] = 0;
|
| 546 |
|
|
break;
|
| 547 |
|
|
|
| 548 |
|
|
case 'd':
|
| 549 |
|
|
/* toggle debug flag */
|
| 550 |
|
|
break;
|
| 551 |
|
|
|
| 552 |
|
|
case 'g': /* return the value of the CPU registers */
|
| 553 |
|
|
{
|
| 554 |
|
|
ptr = remcomOutBuffer;
|
| 555 |
|
|
/* G & O regs */
|
| 556 |
|
|
ptr = mem2hex((char *)registers, ptr, 16 * 4);
|
| 557 |
|
|
/* L & I regs */
|
| 558 |
|
|
ptr = mem2hex((char *) (sp + 0), ptr, 16 * 4);
|
| 559 |
|
|
/* Floating point */
|
| 560 |
|
|
memset(ptr, '0', 32 * 8);
|
| 561 |
|
|
/* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
|
| 562 |
|
|
mem2hex((char *)®isters[Y], (ptr + 32 * 4 * 2), (8 * 4));
|
| 563 |
|
|
}
|
| 564 |
|
|
break;
|
| 565 |
|
|
|
| 566 |
|
|
case 'G': /* set the value of the CPU registers - return OK */
|
| 567 |
|
|
{
|
| 568 |
|
|
unsigned long *newsp, psr;
|
| 569 |
|
|
|
| 570 |
|
|
psr = registers[PSR];
|
| 571 |
|
|
|
| 572 |
|
|
ptr = &remcomInBuffer[1];
|
| 573 |
|
|
/* G & O regs */
|
| 574 |
|
|
hex2mem(ptr, (char *)registers, 16 * 4);
|
| 575 |
|
|
/* L & I regs */
|
| 576 |
|
|
hex2mem(ptr + 16 * 4 * 2, (char *) (sp + 0), 16 * 4);
|
| 577 |
|
|
/* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
|
| 578 |
|
|
hex2mem(ptr + 64 * 4 * 2, (char *)®isters[Y], 8 * 4);
|
| 579 |
|
|
|
| 580 |
|
|
/* See if the stack pointer has moved. If so,
|
| 581 |
|
|
* then copy the saved locals and ins to the
|
| 582 |
|
|
* new location. This keeps the window
|
| 583 |
|
|
* overflow and underflow routines happy.
|
| 584 |
|
|
*/
|
| 585 |
|
|
|
| 586 |
|
|
newsp = (unsigned long *)registers[SP];
|
| 587 |
|
|
if (sp != newsp)
|
| 588 |
|
|
sp = memcpy(newsp, sp, 16 * 4);
|
| 589 |
|
|
|
| 590 |
|
|
/* Don't allow CWP to be modified. */
|
| 591 |
|
|
|
| 592 |
|
|
if (psr != registers[PSR])
|
| 593 |
|
|
registers[PSR] = (psr & 0x1f) | (registers[PSR] & ~0x1f);
|
| 594 |
|
|
|
| 595 |
|
|
strcpy(remcomOutBuffer,"OK");
|
| 596 |
|
|
}
|
| 597 |
|
|
break;
|
| 598 |
|
|
|
| 599 |
|
|
case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
|
| 600 |
|
|
/* Try to read %x,%x. */
|
| 601 |
|
|
|
| 602 |
|
|
ptr = &remcomInBuffer[1];
|
| 603 |
|
|
|
| 604 |
|
|
if (hexToInt(&ptr, &addr)
|
| 605 |
|
|
&& *ptr++ == ','
|
| 606 |
|
|
&& hexToInt(&ptr, &length)) {
|
| 607 |
|
|
if (mem2hex((char *)addr, remcomOutBuffer, length))
|
| 608 |
|
|
break;
|
| 609 |
|
|
|
| 610 |
|
|
strcpy (remcomOutBuffer, "E03");
|
| 611 |
|
|
} else {
|
| 612 |
|
|
strcpy(remcomOutBuffer,"E01");
|
| 613 |
|
|
}
|
| 614 |
|
|
break;
|
| 615 |
|
|
|
| 616 |
|
|
case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */
|
| 617 |
|
|
/* Try to read '%x,%x:'. */
|
| 618 |
|
|
|
| 619 |
|
|
ptr = &remcomInBuffer[1];
|
| 620 |
|
|
|
| 621 |
|
|
if (hexToInt(&ptr, &addr)
|
| 622 |
|
|
&& *ptr++ == ','
|
| 623 |
|
|
&& hexToInt(&ptr, &length)
|
| 624 |
|
|
&& *ptr++ == ':') {
|
| 625 |
|
|
if (hex2mem(ptr, (char *)addr, length)) {
|
| 626 |
|
|
strcpy(remcomOutBuffer, "OK");
|
| 627 |
|
|
} else {
|
| 628 |
|
|
strcpy(remcomOutBuffer, "E03");
|
| 629 |
|
|
}
|
| 630 |
|
|
} else {
|
| 631 |
|
|
strcpy(remcomOutBuffer, "E02");
|
| 632 |
|
|
}
|
| 633 |
|
|
break;
|
| 634 |
|
|
|
| 635 |
|
|
case 'c': /* cAA..AA Continue at address AA..AA(optional) */
|
| 636 |
|
|
/* try to read optional parameter, pc unchanged if no parm */
|
| 637 |
|
|
|
| 638 |
|
|
ptr = &remcomInBuffer[1];
|
| 639 |
|
|
if (hexToInt(&ptr, &addr)) {
|
| 640 |
|
|
registers[PC] = addr;
|
| 641 |
|
|
registers[NPC] = addr + 4;
|
| 642 |
|
|
}
|
| 643 |
|
|
|
| 644 |
|
|
/* Need to flush the instruction cache here, as we may have deposited a
|
| 645 |
|
|
* breakpoint, and the icache probably has no way of knowing that a data ref to
|
| 646 |
|
|
* some location may have changed something that is in the instruction cache.
|
| 647 |
|
|
*/
|
| 648 |
|
|
flush_cache_all();
|
| 649 |
|
|
return;
|
| 650 |
|
|
|
| 651 |
|
|
/* kill the program */
|
| 652 |
|
|
case 'k' : /* do nothing */
|
| 653 |
|
|
break;
|
| 654 |
|
|
case 'r': /* Reset */
|
| 655 |
|
|
asm ("call 0\n\t"
|
| 656 |
|
|
"nop\n\t");
|
| 657 |
|
|
break;
|
| 658 |
|
|
} /* switch */
|
| 659 |
|
|
|
| 660 |
|
|
/* reply to the request */
|
| 661 |
|
|
putpacket(remcomOutBuffer);
|
| 662 |
|
|
} /* while(1) */
|
| 663 |
|
|
}
|
| 664 |
|
|
|
| 665 |
|
|
/* This function will generate a breakpoint exception. It is used at the
|
| 666 |
|
|
beginning of a program to sync up with a debugger and can be used
|
| 667 |
|
|
otherwise as a quick means to stop program execution and "break" into
|
| 668 |
|
|
the debugger. */
|
| 669 |
|
|
|
| 670 |
|
|
void
|
| 671 |
|
|
breakpoint(void)
|
| 672 |
|
|
{
|
| 673 |
|
|
if (!initialized)
|
| 674 |
|
|
return;
|
| 675 |
|
|
|
| 676 |
|
|
/* Again, watch those c-prefixes for solaris/elf kernels */
|
| 677 |
|
|
#ifndef __svr4__
|
| 678 |
|
|
asm(" .globl _breakinst
|
| 679 |
|
|
|
| 680 |
|
|
_breakinst: ta 1
|
| 681 |
|
|
");
|
| 682 |
|
|
#else
|
| 683 |
|
|
asm(" .globl breakinst
|
| 684 |
|
|
|
| 685 |
|
|
breakinst: ta 1
|
| 686 |
|
|
");
|
| 687 |
|
|
#endif
|
| 688 |
|
|
}
|
