diff options
| author | Jordan Niethe <jniethe5@gmail.com> | 2020-05-06 13:40:50 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-19 00:11:03 +1000 |
| commit | 3920742b92f5ea19a220edb947b6f33c99f501da (patch) | |
| tree | e15c83a8fa8ca89adf95badfa38490dfc2d23447 /arch/powerpc/lib | |
| parent | 50b80a12e4ccff46d53b93754d817acd98bc9ae0 (diff) | |
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
Diffstat (limited to 'arch/powerpc/lib')
| -rw-r--r-- | arch/powerpc/lib/sstep.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index 6549baa2ec03..5abe98216dc2 100644 --- a/arch/powerpc/lib/sstep.c +++ b/arch/powerpc/lib/sstep.c @@ -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; |