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The current code assumes that sizeof(long) == 32, which obviously isn't true on LP64 platforms. The attached patch fixes that by using the sign-extension idiom that's also used for SPARC. It still assumes that a long can hold a 18-bit signed integer, but ISO C guarantees that it can.
OK?
P.S. Incidentally I think the function should return a LONGEST instead of CORE_ADDR.
Index: ChangeLog from Mark Kettenis <kettenis@gnu.org>
* mips-tdep.c (mips32_relative_offset): Avoid ussumption that sizeof(long) == 32.
Index: mips-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/mips-tdep.c,v
retrieving revision 1.362
diff -u -p -r1.362 mips-tdep.c
--- mips-tdep.c 31 Oct 2004 21:51:58 -0000 1.362
+++ mips-tdep.c 9 Nov 2004 12:51:40 -0000
@@ -881,14 +881,8 @@ mips_fetch_instruction (CORE_ADDR addr)
static CORE_ADDR
mips32_relative_offset (unsigned long inst)
{
- long x;
- x = itype_immediate (inst);
- if (x & 0x8000) /* sign bit set */
- {
- x |= 0xffff0000; /* sign extension */
- }
- x = x << 2;
- return x;
+ long x = ((itype_immediate (inst) ^ 0x8000) - 0x8000);
+ return x << 2;
}
/* Determine whate to set a single step breakpoint while considering
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