* i386-nlmstub.c: Update to be more in line with PIN stub.
* nlm/gdbserve.c (putDebugChar): Install bug fix from i386-nlmstub. * (hex2mem): Init ptr. * General cleanups to use ConsolePrintf, standard prologues, etc...
This commit is contained in:
Stu Grossman
parent
9b63f09c7d
commit
a49666feb0
@ -1,3 +1,10 @@
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Tue Apr 26 22:45:24 1994 Stu Grossman (grossman at cygnus.com)
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* i386-nlmstub.c: Update to be more in line with PIN stub.
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* nlm/gdbserve.c (putDebugChar): Install bug fix from i386-nlmstub.
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* (hex2mem): Init ptr.
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* General cleanups to use ConsolePrintf, standard prologues, etc...
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Tue Apr 26 10:23:04 1994 Stu Grossman (grossman at cygnus.com)
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* i386-nlmstub.c: More changes to be compatible with remote.c.
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@ -124,15 +124,6 @@ struct DBG_LoadDefinitionStructure
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/* The main thread ID. */
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static int mainthread;
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/* The LoadDefinitionStructure of the NLM being debugged. */
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static struct DBG_LoadDefinitionStructure *handle;
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/* Whether we have connected to gdb. */
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static int talking;
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/* The actual first instruction in the program. */
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static unsigned char first_insn;
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/* An error message for the main thread to print. */
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static char *error_message;
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@ -141,7 +132,7 @@ static int AIOhandle;
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/* BUFMAX defines the maximum number of characters in inbound/outbound
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buffers. At least NUMREGBYTES*2 are needed for register packets */
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#define BUFMAX 400
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#define BUFMAX (REGISTER_BYTES * 2 + 16)
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/* remote_debug > 0 prints ill-formed commands in valid packets and
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checksum errors. */
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@ -149,17 +140,21 @@ static int remote_debug = 1;
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static const char hexchars[] = "0123456789abcdef";
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/* Number of bytes of registers. */
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#define NUMREGBYTES 64
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enum regnames {EAX, ECX, EDX, EBX, ESP, EBP, ESI, EDI,
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PC /* also known as eip */,
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PS /* also known as eflags */,
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CS, SS, DS, ES, FS, GS};
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/* Register values. All of these values *MUST* agree with tm.h */
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#define SP_REGNUM 4 /* Contains address of top of stack */
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#define PC_REGNUM 8 /* Contains program counter */
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#define FP_REGNUM 5 /* Virtual frame pointer */
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#define NUM_REGS 16 /* Number of machine registers */
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#define REGISTER_BYTES (NUM_REGS * 4) /* Total size of registers array */
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/* Register values. */
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static int registers[NUMREGBYTES/4];
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static void flush_i_cache() {}
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static char *mem2hex (void *mem, char *buf, int count, int may_fault);
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static char *hex2mem (char *buf, void *mem, int count, int may_fault);
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#if 0
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__main() {};
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#endif
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/* Read a character from the serial port. This must busy wait, but
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that's OK because we will be the only thread running anyhow. */
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@ -211,49 +206,45 @@ putDebugChar (c)
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static void
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frame_to_registers (frame, regs)
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T_TSS_StackFrame *frame;
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int *regs;
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char *regs;
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{
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regs[EAX] = frame->ExceptionEAX;
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regs[ECX] = frame->ExceptionECX;
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regs[EDX] = frame->ExceptionEDX;
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regs[EBX] = frame->ExceptionEBX;
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regs[ESP] = frame->ExceptionESP;
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regs[EBP] = frame->ExceptionEBP;
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regs[ESI] = frame->ExceptionESI;
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regs[EDI] = frame->ExceptionEDI;
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regs[PC] = frame->ExceptionEIP;
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regs[PS] = frame->ExceptionSystemFlags;
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regs[CS] = frame->ExceptionCS[0];
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regs[SS] = frame->ExceptionSS[0];
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regs[DS] = frame->ExceptionDS[0];
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regs[ES] = frame->ExceptionES[0];
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regs[FS] = frame->ExceptionFS[0];
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regs[GS] = frame->ExceptionGS[0];
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/* Copy EAX -> EDI */
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mem2hex (&frame->ExceptionEAX, ®s[0 * 4 * 2], 4 * 8, 0);
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/* Copy EIP & PS */
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mem2hex (&frame->ExceptionEIP, ®s[8 * 4 * 2], 4 * 2, 0);
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/* Copy CS, SS, DS */
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mem2hex (&frame->ExceptionCS, ®s[10 * 4 * 2], 4 * 3, 0);
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/* Copy ES */
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mem2hex (&frame->ExceptionES, ®s[13 * 4 * 2], 4 * 1, 0);
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/* Copy FS & GS */
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mem2hex (&frame->ExceptionFS, ®s[14 * 4 * 2], 4 * 2, 0);
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}
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/* Put the registers back into the frame information. */
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static void
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registers_to_frame (regs, frame)
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int *regs;
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char *regs;
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T_TSS_StackFrame *frame;
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{
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frame->ExceptionEAX = regs[EAX];
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frame->ExceptionECX = regs[ECX];
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frame->ExceptionEDX = regs[EDX];
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frame->ExceptionEBX = regs[EBX];
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frame->ExceptionESP = regs[ESP];
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frame->ExceptionEBP = regs[EBP];
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frame->ExceptionESI = regs[ESI];
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frame->ExceptionEDI = regs[EDI];
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frame->ExceptionEIP = regs[PC];
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frame->ExceptionSystemFlags = regs[PS];
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frame->ExceptionCS[0] = regs[CS];
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frame->ExceptionSS[0] = regs[SS];
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frame->ExceptionDS[0] = regs[DS];
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frame->ExceptionES[0] = regs[ES];
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frame->ExceptionFS[0] = regs[FS];
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frame->ExceptionGS[0] = regs[GS];
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/* Copy EAX -> EDI */
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hex2mem (®s[0 * 4 * 2], &frame->ExceptionEAX, 4 * 8, 0);
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/* Copy EIP & PS */
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hex2mem (®s[8 * 4 * 2], &frame->ExceptionEIP, 4 * 2, 0);
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/* Copy CS, SS, DS */
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hex2mem (®s[10 * 4 * 2], &frame->ExceptionCS, 4 * 3, 0);
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/* Copy ES */
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hex2mem (®s[13 * 4 * 2], &frame->ExceptionES, 4 * 1, 0);
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/* Copy FS & GS */
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hex2mem (®s[14 * 4 * 2], &frame->ExceptionFS, 4 * 2, 0);
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}
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/* Turn a hex character into a number. */
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@ -319,17 +310,16 @@ getpacket (buffer)
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if (ch == -1)
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return 0;
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xmitcsum += hex(ch);
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if ((remote_debug ) && (checksum != xmitcsum))
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{
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fprintf(stderr,"bad checksum. My count = 0x%x, sent=0x%x. buf=%s\n",
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checksum,xmitcsum,buffer);
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}
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if (checksum != xmitcsum)
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{
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if (remote_debug)
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ConsolePrintf ("bad checksum. My count = 0x%x, sent=0x%x. buf=%s\n",
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checksum,xmitcsum,buffer);
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/* failed checksum */
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if (! putDebugChar('-'))
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return 0;
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return 1;
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}
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else
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{
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@ -413,8 +403,8 @@ debug_error (format, parm)
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{
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if (remote_debug)
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{
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fprintf (stderr, format, parm);
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fprintf (stderr, "\n");
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ConsolePrintf (format, parm);
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ConsolePrintf ("\n");
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}
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}
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@ -464,18 +454,19 @@ asm ("ret");
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static char *
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mem2hex (mem, buf, count, may_fault)
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char *mem;
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void *mem;
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char *buf;
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int count;
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int may_fault;
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{
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int i;
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unsigned char ch;
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char *ptr = mem;
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mem_may_fault = may_fault;
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for (i = 0; i < count; i++)
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{
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ch = get_char (mem++);
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ch = get_char (ptr++);
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if (may_fault && mem_err)
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return (buf);
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*buf++ = hexchars[ch >> 4];
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@ -492,21 +483,22 @@ mem2hex (mem, buf, count, may_fault)
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static char *
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hex2mem (buf, mem, count, may_fault)
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char *buf;
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char *mem;
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void *mem;
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int count;
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int may_fault;
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{
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int i;
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unsigned char ch;
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char *ptr = mem;
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mem_may_fault = may_fault;
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for (i=0;i<count;i++)
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{
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ch = hex(*buf++) << 4;
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ch = ch + hex(*buf++);
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set_char (mem++, ch);
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set_char (ptr++, ch);
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if (may_fault && mem_err)
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return (mem);
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return (ptr);
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}
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mem_may_fault = 0;
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return(mem);
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@ -574,18 +566,45 @@ hexToInt(ptr, intValue)
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return (numChars);
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}
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static void
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do_status (ptr, frame)
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char *ptr;
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struct T_TSS_StackFrame *frame;
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{
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int sigval;
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sigval = computeSignal (frame->ExceptionNumber);
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sprintf (ptr, "T%02x", sigval);
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ptr += 3;
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sprintf (ptr, "%02x:", PC_REGNUM);
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ptr = mem2hex (&frame->ExceptionEIP, ptr + 3, 4, 0);
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*ptr++ = ';';
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sprintf (ptr, "%02x:", SP_REGNUM);
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ptr = mem2hex (&frame->ExceptionESP, ptr + 3, 4, 0);
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*ptr++ = ';';
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sprintf (ptr, "%02x:", FP_REGNUM);
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ptr = mem2hex (&frame->ExceptionEBP, ptr + 3, 4, 0);
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*ptr++ = ';';
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*ptr = '\000';
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}
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/* This function does all command processing for interfacing to gdb.
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It is called whenever an exception occurs in the module being
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debugged. */
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static LONG
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handle_exception (T_StackFrame *old_frame)
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handle_exception (frame)
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T_TSS_StackFrame *frame;
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{
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T_TSS_StackFrame *frame = (T_TSS_StackFrame *) old_frame;
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int sigval;
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int addr, length;
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char * ptr;
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int newPC;
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char *ptr;
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static struct DBG_LoadDefinitionStructure *ldinfo = 0;
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static LONG first_insn; /* The first instruction in the program. */
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/* Apparently the bell can sometimes be ringing at this point, and
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should be stopped. */
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@ -601,64 +620,80 @@ handle_exception (T_StackFrame *old_frame)
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GetThreadID ());
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}
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/* If the NLM just started, we record the module load information
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and the thread ID, and set a breakpoint at the first instruction
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in the program. */
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if (frame->ExceptionNumber == START_NLM_EVENT
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&& handle == NULL)
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switch (frame->ExceptionNumber)
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{
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handle = ((struct DBG_LoadDefinitionStructure *)
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case START_NLM_EVENT:
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/* If the NLM just started, we record the module load information
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and the thread ID, and set a breakpoint at the first instruction
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in the program. */
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ldinfo = ((struct DBG_LoadDefinitionStructure *)
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frame->ExceptionErrorCode);
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first_insn = *(char *) handle->LDInitializationProcedure;
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*(unsigned char *) handle->LDInitializationProcedure = 0xcc;
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ConsolePrintf ("NLM offsets/lengths: Code: 0x%x/0x%x, Data: 0x%x/0x%x, BSS: /0x%x\r\n",
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handle->LDCodeImageOffset, handle->LDCodeImageLength,
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handle->LDDataImageOffset, handle->LDDataImageLength,
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handle->LDUninitializedDataLength);
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first_insn = *(unsigned char *)ldinfo->LDInitializationProcedure;
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*(unsigned char *)ldinfo->LDInitializationProcedure = 0xcc;
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flush_i_cache ();
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return RETURN_TO_PROGRAM;
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}
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/* After we've reached the initial breakpoint, reset it. */
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if (frame->ExceptionEIP == (LONG) handle->LDInitializationProcedure + 1
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&& *(unsigned char *) handle->LDInitializationProcedure == 0xcc)
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{
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*(char *) handle->LDInitializationProcedure = first_insn;
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frame->ExceptionEIP = (LONG) handle->LDInitializationProcedure;
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}
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case ENTER_DEBUGGER_EVENT:
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case KEYBOARD_BREAK_EVENT:
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/* Pass some events on to the next debugger, in case it will handle
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them. */
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return RETURN_TO_NEXT_DEBUGGER;
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/* Pass some events on to the next debugger, in case it will handle
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them. */
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if (frame->ExceptionNumber == ENTER_DEBUGGER_EVENT
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|| frame->ExceptionNumber == KEYBOARD_BREAK_EVENT)
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return RETURN_TO_NEXT_DEBUGGER;
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case 3: /* Breakpoint */
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/* After we've reached the initial breakpoint, reset it. */
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if (frame->ExceptionEIP - 1 == (long) ldinfo->LDInitializationProcedure
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&& *(unsigned char *) ldinfo->LDInitializationProcedure == 0xcc)
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{
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*(unsigned char *) ldinfo->LDInitializationProcedure = first_insn;
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frame->ExceptionEIP -= 1;
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flush_i_cache ();
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}
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/* Normal breakpoints end up here */
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do_status (remcomOutBuffer, frame);
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break;
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/* At the moment, we don't care about most of the unusual NetWare
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exceptions. */
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if (frame->ExceptionNumber != TERMINATE_NLM_EVENT
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&& frame->ExceptionNumber > 31)
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return RETURN_TO_PROGRAM;
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default:
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/* At the moment, we don't care about most of the unusual NetWare
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exceptions. */
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if (frame->ExceptionNumber > 31)
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return RETURN_TO_PROGRAM;
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/* If we get a GP fault, and mem_may_fault is set, and the
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instruction pointer is near set_char or get_char, then we caused
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the fault ourselves accessing an illegal memory location. */
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if (mem_may_fault
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&& (frame->ExceptionNumber == 11
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|| frame->ExceptionNumber == 13
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|| frame->ExceptionNumber == 14)
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&& ((frame->ExceptionEIP >= (long) &set_char
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&& frame->ExceptionEIP < (long) &set_char + 50)
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|| (frame->ExceptionEIP >= (long) &get_char
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&& frame->ExceptionEIP < (long) &get_char + 50)))
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{
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mem_err = 1;
|
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/* Point the instruction pointer at an assembly language stub
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which just returns from the function. */
|
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frame->ExceptionEIP = (long) &just_return;
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/* Keep going. This will act as though it returned from
|
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set_char or get_char. The calling routine will check
|
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mem_err, and do the right thing. */
|
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return RETURN_TO_PROGRAM;
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/* Most machine level exceptions end up here */
|
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do_status (remcomOutBuffer, frame);
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break;
|
||||
|
||||
case 11: /* Segment not present */
|
||||
case 13: /* General protection */
|
||||
case 14: /* Page fault */
|
||||
/* If we get a GP fault, and mem_may_fault is set, and the
|
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instruction pointer is near set_char or get_char, then we caused
|
||||
the fault ourselves accessing an illegal memory location. */
|
||||
if (mem_may_fault
|
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&& ((frame->ExceptionEIP >= (long) &set_char
|
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&& frame->ExceptionEIP < (long) &set_char + 50)
|
||||
|| (frame->ExceptionEIP >= (long) &get_char
|
||||
&& frame->ExceptionEIP < (long) &get_char + 50)))
|
||||
{
|
||||
mem_err = 1;
|
||||
/* Point the instruction pointer at an assembly language stub
|
||||
which just returns from the function. */
|
||||
|
||||
frame->ExceptionEIP = (long) &just_return;
|
||||
|
||||
/* Keep going. This will act as though it returned from
|
||||
set_char or get_char. The calling routine will check
|
||||
mem_err, and do the right thing. */
|
||||
return RETURN_TO_PROGRAM;
|
||||
}
|
||||
/* Random mem fault, report it */
|
||||
do_status (remcomOutBuffer, frame);
|
||||
break;
|
||||
|
||||
case TERMINATE_NLM_EVENT:
|
||||
/* There is no way to get the exit status. */
|
||||
sprintf (remcomOutBuffer, "W%02x", 0);
|
||||
break; /* We generate our own status */
|
||||
}
|
||||
|
||||
/* FIXME: How do we know that this exception has anything to do with
|
||||
@ -666,26 +701,6 @@ handle_exception (T_StackFrame *old_frame)
|
||||
the range of the module we are debugging, but that doesn't help
|
||||
much since an error could occur in a library routine. */
|
||||
|
||||
frame_to_registers (frame, registers);
|
||||
|
||||
/* reply to host that an exception has occurred */
|
||||
if (frame->ExceptionNumber == TERMINATE_NLM_EVENT)
|
||||
{
|
||||
/* There is no way to get the exit status. */
|
||||
remcomOutBuffer[0] = 'W';
|
||||
remcomOutBuffer[1] = hexchars[0];
|
||||
remcomOutBuffer[2] = hexchars[0];
|
||||
remcomOutBuffer[3] = 0;
|
||||
}
|
||||
else
|
||||
{
|
||||
sigval = computeSignal (frame->ExceptionNumber);
|
||||
remcomOutBuffer[0] = 'S';
|
||||
remcomOutBuffer[1] = hexchars[sigval >> 4];
|
||||
remcomOutBuffer[2] = hexchars[sigval % 16];
|
||||
remcomOutBuffer[3] = 0;
|
||||
}
|
||||
|
||||
if (! putpacket(remcomOutBuffer))
|
||||
return RETURN_TO_NEXT_DEBUGGER;
|
||||
|
||||
@ -701,26 +716,21 @@ handle_exception (T_StackFrame *old_frame)
|
||||
remcomOutBuffer[0] = 0;
|
||||
if (! getpacket (remcomInBuffer))
|
||||
return RETURN_TO_NEXT_DEBUGGER;
|
||||
talking = 1;
|
||||
switch (remcomInBuffer[0])
|
||||
{
|
||||
case '?':
|
||||
sigval = computeSignal (frame->ExceptionNumber);
|
||||
remcomOutBuffer[0] = 'S';
|
||||
remcomOutBuffer[1] = hexchars[sigval >> 4];
|
||||
remcomOutBuffer[2] = hexchars[sigval % 16];
|
||||
remcomOutBuffer[3] = 0;
|
||||
do_status (remcomOutBuffer, frame);
|
||||
break;
|
||||
case 'd':
|
||||
remote_debug = !(remote_debug); /* toggle debug flag */
|
||||
break;
|
||||
case 'g':
|
||||
/* return the value of the CPU registers */
|
||||
mem2hex((char*) registers, remcomOutBuffer, NUMREGBYTES, 0);
|
||||
frame_to_registers (frame, remcomOutBuffer);
|
||||
break;
|
||||
case 'G':
|
||||
/* set the value of the CPU registers - return OK */
|
||||
hex2mem(&remcomInBuffer[1], (char*) registers, NUMREGBYTES, 0);
|
||||
registers_to_frame (&remcomInBuffer[1], frame);
|
||||
strcpy(remcomOutBuffer,"OK");
|
||||
break;
|
||||
|
||||
@ -787,22 +797,25 @@ handle_exception (T_StackFrame *old_frame)
|
||||
/* try to read optional parameter, pc unchanged if no parm */
|
||||
ptr = &remcomInBuffer[1];
|
||||
if (hexToInt(&ptr,&addr))
|
||||
registers[ PC ] = addr;
|
||||
|
||||
newPC = registers[ PC];
|
||||
{
|
||||
/* registers[PC_REGNUM].lo = addr;*/
|
||||
fprintf (stderr, "Setting PC to 0x%x\n", addr);
|
||||
while (1);
|
||||
}
|
||||
|
||||
/* clear the trace bit */
|
||||
registers[ PS ] &= 0xfffffeff;
|
||||
frame->ExceptionSystemFlags &= ~0x100;
|
||||
|
||||
/* set the trace bit if we're stepping */
|
||||
if (remcomInBuffer[0] == 's') registers[ PS ] |= 0x100;
|
||||
if (remcomInBuffer[0] == 's')
|
||||
frame->ExceptionSystemFlags |= 0x100;
|
||||
|
||||
registers_to_frame (registers, frame);
|
||||
flush_i_cache ();
|
||||
return RETURN_TO_PROGRAM;
|
||||
|
||||
case 'k':
|
||||
/* kill the program */
|
||||
KillMe (handle);
|
||||
KillMe (ldinfo);
|
||||
ResumeThread (mainthread);
|
||||
return RETURN_TO_PROGRAM;
|
||||
|
||||
@ -810,9 +823,9 @@ handle_exception (T_StackFrame *old_frame)
|
||||
if (strcmp (&remcomInBuffer[1], "Offsets") == 0)
|
||||
{
|
||||
sprintf (remcomOutBuffer, "Text=%x;Data=%x;Bss=%x",
|
||||
handle->LDCodeImageOffset,
|
||||
handle->LDDataImageOffset,
|
||||
handle->LDDataImageOffset + handle->LDDataImageLength);
|
||||
ldinfo->LDCodeImageOffset,
|
||||
ldinfo->LDDataImageOffset,
|
||||
ldinfo->LDDataImageOffset + ldinfo->LDDataImageLength);
|
||||
}
|
||||
else
|
||||
sprintf (remcomOutBuffer, "E04, Unknown query %s", &remcomInBuffer[1]);
|
||||
@ -936,7 +949,7 @@ main (argc, argv)
|
||||
memset (&s, 0, sizeof s);
|
||||
s.DDSResourceTag = ((struct ResourceTagStructure *)
|
||||
AllocateResourceTag (GetNLMHandle (),
|
||||
"gdbserver",
|
||||
(BYTE *)"gdbserver",
|
||||
DebuggerSignature));
|
||||
if (s.DDSResourceTag == 0)
|
||||
{
|
||||
@ -977,8 +990,6 @@ main (argc, argv)
|
||||
}
|
||||
|
||||
mainthread = GetThreadID ();
|
||||
handle = NULL;
|
||||
talking = 0;
|
||||
|
||||
if (remote_debug > 0)
|
||||
ConsolePrintf ("About to call LoadModule with \"%s\" %08x\r\n",
|
||||
@ -986,7 +997,7 @@ main (argc, argv)
|
||||
|
||||
/* Start up the module to be debugged. */
|
||||
err = LoadModule ((struct ScreenStruct *) __GetScreenID (GetCurrentScreen()),
|
||||
cmdlin, LO_DEBUG);
|
||||
(BYTE *)cmdlin, LO_DEBUG);
|
||||
if (err != 0)
|
||||
{
|
||||
fprintf (stderr, "LoadModule failed: %d\n", err);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user