taylor@THINK.COM (06/11/89)
On the ns32k, the value stored in memory for the 3rd operand of the
cmpm/movm instructions is:
(3rd operand - 1) * i
where i is the integer length (1, 2, or 4). Thus the reverse
computation needs to be done when disassembling the instruction. GDB
doesn't. It also doesn't recognize the 2nd argument to the deid and
meid instructions.
Here are the changes to fix both:
RCS file: RCS/ns32k-opcode.h,v
retrieving revision 1.4
diff -c1 -r1.4 ns32k-opcode.h
*** /tmp/,RCSt1000272 Sat Jun 10 21:44:04 1989
--- ns32k-opcode.h Sat Jun 10 21:29:09 1989
***************
*** 44,46 ****
--- 44,48 ----
* Q : quad-word
+ * A : address
* d : displacement
+ * b : 3rd operand of cmpm or movm instruction
* q : quick
***************
*** 136,140 ****
{ "cmpd", 6,16, 0x07, "1D2D" },
! { "cmpmb", 14,24, 0x04ce, "1A2A3d" },
! { "cmpmw", 14,24, 0x05ce, "1A2A3d" },
! { "cmpmd", 14,24, 0x07ce, "1A2A3d" },
{ "cmpqb", 7,16, 0x1c, "2B1q" },
--- 138,142 ----
{ "cmpd", 6,16, 0x07, "1D2D" },
! { "cmpmb", 14,24, 0x04ce, "1A2A3b" },
! { "cmpmw", 14,24, 0x05ce, "1A2A3b" },
! { "cmpmd", 14,24, 0x07ce, "1A2A3b" },
{ "cmpqb", 7,16, 0x1c, "2B1q" },
***************
*** 220,224 ****
{ "movlf", 14,24, 0x163e, "1L2F" },
! { "movmb", 14,24, 0x00ce, "1A2A3d" },
! { "movmw", 14,24, 0x01ce, "1A2A3d" },
! { "movmd", 14,24, 0x03ce, "1A2A3d" },
{ "movqb", 7,16, 0x5c, "2B1q" },
--- 222,226 ----
{ "movlf", 14,24, 0x163e, "1L2F" },
! { "movmb", 14,24, 0x00ce, "1A2A3b" },
! { "movmw", 14,24, 0x01ce, "1A2A3b" },
! { "movmd", 14,24, 0x03ce, "1A2A3b" },
{ "movqb", 7,16, 0x5c, "2B1q" },
===================================================================
RCS file: RCS/ns32k-pinsn.c,v
retrieving revision 1.3
diff -c1 -r1.3 ns32k-pinsn.c
*** /tmp/,RCSt1000272 Sat Jun 10 21:44:06 1989
--- ns32k-pinsn.c Sat Jun 10 21:24:45 1989
***************
*** 386,387 ****
--- 386,388 ----
int index;
+ int size;
***************
*** 394,395 ****
--- 395,397 ----
case 'D':
+ case 'Q':
case 'A':
***************
*** 529,530 ****
--- 531,553 ----
sprintf (result, "%d", get_displacement (buffer, aoffsetp));
+ break;
+ case 'b':
+ Ivalue = get_displacement (buffer, aoffsetp);
+ /*
+ * Warning!! HACK ALERT!
+ * Operand type 'b' is only used by the cmp{b,w,d} and
+ * movm{b,w,d} instructions; we need to know whether
+ * it's a `b' or `w' or `d' instruction; and for both
+ * cmpm and movm it's stored at the same place so we
+ * just grab two bits of the opcode and look at it...
+ *
+ */
+ size = bit_extract(buffer, ioffset-6, 2);
+ if (size == 0) /* 00 => b */
+ size = 1;
+ else if (size == 1) /* 01 => w */
+ size = 2;
+ else
+ size = 4; /* 11 => d */
+
+ sprintf (result, "%d", (Ivalue / size) + 1);
break;nr@PRINCETON.EDU (Norman Ramsey) (07/18/89)
I'm stuck trying to debug a code generator for the DEC PMAX (with the Mips R2000 RISC CPU chip). Do you know if there is now available, or is in the pipeline, a version of gdb that would run on this machine? The operating system seems to be DEC Ultrix. Norman Ramsey Compute Science, Princeton University nr@princeton.edu