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target/mips: Add nanoMIPS decoding and extraction utilities

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Add some basic utility functions and macros for nanoMIPS decoding
engine.

Backports commit 6bfa9f4c9cf24d6cfaaa227722e9cdcca1ad6fe9 from qemu
This commit is contained in:
Aleksandar Markovic 2018-08-27 04:17:17 -04:00 committed by Lioncash
parent 5decf2e0ed
commit bfc5637339
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1 changed files with 11 additions and 0 deletions
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11
qemu/target/mips/translate.c
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@ -16703,6 +16703,17 @@ enum {
*
*/
/* extraction utilities */
#define NANOMIPS_EXTRACT_RD(op) ((op >> 7) & 0x7)
#define NANOMIPS_EXTRACT_RS(op) ((op >> 4) & 0x7)
#define NANOMIPS_EXTRACT_RS2(op) uMIPS_RS(op)
#define NANOMIPS_EXTRACT_RS1(op) ((op >> 1) & 0x7)
#define NANOMIPS_EXTRACT_RD5(op) ((op >> 5) & 0x1f)
#define NANOMIPS_EXTRACT_RS5(op) (op & 0x1f)
static int decode_nanomips_opc(CPUMIPSState *env, DisasContext *ctx)
{
return 2;