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m68k: Add support for the FNOP instruction (fixes #1916) 

The FNOP instruction has the same encoding as FBF with zero displacement,
but according to the manual, it has some additional synchronization
functions, so it would be good if Capstone disassembles this with the
FNOP mnemonic instead of the FBF mnemonic.

Before this change:

$ cstool m68k40 0xf2800000
 0  f2 80 00 00  fbf.w	$2

After this change:

$ cstool m68k40 0xf2800000
 0  f2 80 00 00  fnop
This commit is contained in:
Thomas Huth 2022-10-02 07:58:00 +02:00
parent 55dd90c50a
commit 15286490fb
1 changed files with 7 additions and 0 deletions
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7
arch/M68K/M68KDisassembler.c
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@ -1784,6 +1784,13 @@ static void d68020_cpbcc_16(m68k_info *info)
cs_m68k* ext;
LIMIT_CPU_TYPES(info, M68020_PLUS);
// FNOP is a special case of FBF
if (info->ir == 0xf280 && peek_imm_16(info) == 0) {
MCInst_setOpcode(info->inst, M68K_INS_FNOP);
info->pc += 2;
return;
}
// these are all in row with the extension so just doing a add here is fine
info->inst->Opcode += (info->ir & 0x2f);