Mon Dec 21 12:40:10 1992 Ian Lance Taylor (ian@cygnus.com)

[binutils-gdb.git] / gdb / rs6000-pinsn.c

diff --git a/gdb/rs6000-pinsn.c b/gdb/rs6000-pinsn.c
index 6880370bb172228c06e6cdedfc2f98b07d418325..03261e59421c59047131b2e2b7afbf60b0b5864a 100644 (file)
--- a/gdb/rs6000-pinsn.c
+++ b/gdb/rs6000-pinsn.c
@@ -29,7 +29,7 @@ print_insn (memaddr, stream)
   CORE_ADDR memaddr;
   FILE *stream;
 {
-       int  pop, eop;                  /* primary and extended opcodes */
+       int  pop, eop, probable_eop;    /* primary and extended opcodes */
        int  min, max;
        int  best = -1;                 /* found best opcode index      */
        int  oldbest = -1;
@@ -37,7 +37,6 @@ print_insn (memaddr, stream)
 
        read_memory (memaddr, &the_insn, sizeof (the_insn));
        pop = (unsigned)(the_insn >> 26);
-       eop = ((the_insn) >> 1) & 0x3ff;
        min = 0, max = NOPCODES-1;
 
        while (min < max) {
@@ -55,7 +54,7 @@ print_insn (memaddr, stream)
            min = best;
 
          else {
-           /* opcode matched, check extended opcode. */
+           /* Opcode matched, check extended opcode. */
 
            if (rs6k_ops [best].e_opcode == -1) {
              /* there is no valid extended opcode, what we've got is
@@ -63,12 +62,18 @@ print_insn (memaddr, stream)
              goto insn_found;
            }
 
-           else if (eop < rs6k_ops [best].e_opcode) {
+           /* Largest possible value of extended opcode. */
+           probable_eop = ((the_insn) >> 1) & 0x3ff;
+
+           eop = probable_eop & eopMask [rs6k_ops [best].format];
+
+           if (eop < rs6k_ops [best].e_opcode) {
 
              while (pop == rs6k_ops [best].p_opcode) {
                if (eop == rs6k_ops [best].e_opcode)    /* found it! */
                  goto insn_found;
                --best;
+               eop = probable_eop & eopMask [rs6k_ops [best].format];
              }
              goto not_found;
            }
@@ -79,6 +84,7 @@ print_insn (memaddr, stream)
                if (eop == rs6k_ops [best].e_opcode)    /* found it! */
                  goto insn_found;
                ++best;
+               eop = probable_eop & eopMask [rs6k_ops [best].format];
              }
              goto not_found;
            }