diff mbox series

[v7,28/28] powerpc sstep: Add support for prefixed fixed-point arithmetic

Message ID 20200501034220.8982-29-jniethe5@gmail.com (mailing list archive)
State Superseded
Headers show
Series Initial Prefixed Instruction support | expand

Checks

Context Check Description
snowpatch_ozlabs/apply_patch success Successfully applied on branch powerpc/merge (54dc28ff5e0b3585224d49a31b53e030342ca5c3)
snowpatch_ozlabs/build-ppc64le warning Build succeeded but added 3 new sparse warnings
snowpatch_ozlabs/build-ppc64be fail Build failed!
snowpatch_ozlabs/build-ppc64e fail Build failed!
snowpatch_ozlabs/build-pmac32 warning Upstream build failed, couldn't test patch
snowpatch_ozlabs/checkpatch success total: 0 errors, 0 warnings, 0 checks, 26 lines checked
snowpatch_ozlabs/needsstable success Patch has no Fixes tags

Commit Message

Jordan Niethe May 1, 2020, 3:42 a.m. UTC 
This adds emulation support for the following prefixed Fixed-Point
Arithmetic instructions:
  * Prefixed Add Immediate (paddi)

Reviewed-by: Balamuruhan S <bala24@linux.ibm.com>
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
---
v3: Since we moved the prefixed loads/stores into the load/store switch
statement it no longer makes sense to have paddi in there, so move it
out.
---
 arch/powerpc/lib/sstep.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
diff mbox series

Patch

diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index d50fa2a78866..32e3ba742e55 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -1337,6 +1337,26 @@  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 = suffix >> 26;
+		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;