From: Sandipan Das <sandipan@linux.ibm.com>
Date: Sat, 6 Feb 2021 11:47:19 +0000 (+0530)
Subject: arch-power: Add byte-reversed load-store instructions
X-Git-Tag: develop-gem5-snapshot~55
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=baa0bcfae9203a6efee2355422fcc90b14be8b17;p=gem5.git

arch-power: Add byte-reversed load-store instructions

This adds the following instructions.
  * Load Halfword Byte-Reverse Indexed (lhbrx)
  * Load Word Byte-Reverse Indexed (lwbrx)
  * Load Doubleword Byte-Reverse Indexed (ldbrx)
  * Store Halfword Byte-Reverse Indexed (sthbrx)
  * Store Word Byte-Reverse Indexed (stwbrx)
  * Store Doubleword Byte-Reverse Indexed (stdbrx)

Change-Id: Id7aae44c370d6376410ab8c82839b908ea6ca196
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
---

diff --git a/src/arch/power/isa/decoder.isa b/src/arch/power/isa/decoder.isa
index 67eebcde4..a0b91790b 100644
--- a/src/arch/power/isa/decoder.isa
+++ b/src/arch/power/isa/decoder.isa
@@ -248,10 +248,13 @@ decode PO default Unknown::unknown() {
             87: lbzx({{ Rt = Mem_ub; }});
             279: lhzx({{ Rt = Mem_uh; }});
             343: lhax({{ Rt = Mem_sh; }});
+            790: lhbrx({{ Rt = swap_byte(Mem_uh); }});
             23: lwzx({{ Rt = Mem_uw; }});
             341: lwax({{ Rt = Mem_sw; }});
             20: lwarx({{ Rt = Mem_uw; Rsv = 1; RsvLen = 4; RsvAddr = EA; }});
+            534: lwbrx({{ Rt = swap_byte(Mem_uw); }});
             21: ldx({{ Rt = Mem; }});
+            532: ldbrx({{ Rt = swap_byte(Mem); }});
             535: lfsx({{ Ft_sf = Mem_sf; }});
             599: lfdx({{ Ft = Mem_df; }});
             855: lfiwax({{ Ft_uw = Mem; }});
@@ -271,6 +274,7 @@ decode PO default Unknown::unknown() {
         format StoreIndexOp {
             215: stbx({{ Mem_ub = Rs_ub; }});
             407: sthx({{ Mem_uh = Rs_uh; }});
+            918: sthbrx({{ Mem_uh = swap_byte(Rs_uh); }});
             151: stwx({{ Mem_uw = Rs_uw; }});
             150: stwcx({{
                 bool store_performed = false;
@@ -288,7 +292,9 @@ decode PO default Unknown::unknown() {
                 CR = cr;
                 Rsv = 0;
             }});
+            662: stwbrx({{ Mem_uw = swap_byte(Rs_uw); }});
             149: stdx({{ Mem = Rs }});
+            660: stdbrx({{ Mem = swap_byte(Rs); }});
         }
 
         format StoreIndexUpdateOp {