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powerpc sstep: Add support for prefixed fixed-point arithmetic 

This adds emulation support for the following prefixed Fixed-Point
Arithmetic instructions:
  * Prefixed Add Immediate (paddi)

Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Reviewed-by: Balamuruhan S <bala24@linux.ibm.com>
[mpe: Squash in get_op() usage]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200506034050.24806-31-jniethe5@gmail.com
This commit is contained in:
Jordan Niethe 2020-05-06 13:40:50 +10:00 committed by Michael Ellerman
parent 50b80a12e4
commit 3920742b92
1 changed files with 20 additions and 0 deletions
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20
arch/powerpc/lib/sstep.c
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@ -1338,6 +1338,26 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
switch (opcode) {
#ifdef __powerpc64__
case 1:
prefix_r = word & (1ul << 20);
ra = (suffix >> 16) & 0x1f;
rd = (suffix >> 21) & 0x1f;
op->reg = rd;
op->val = regs->gpr[rd];
suffixopcode = get_op(suffix);
prefixtype = (word >> 24) & 0x3;
switch (prefixtype) {
case 2:
if (prefix_r && ra)
return 0;
switch (suffixopcode) {
case 14: /* paddi */
op->type = COMPUTE | PREFIXED;
op->val = mlsd_8lsd_ea(word, suffix, regs);
goto compute_done;
}
}
break;
case 2: /* tdi */
if (rd & trap_compare(regs->gpr[ra], (short) word))
goto trap;