From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Thu, 19 Oct 2023 10:22:41 +0000 (+0100)
Subject: add fixedstoreshift.mdwn as an initial copy of fixedstore.mdwn
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c2dd733cc22804b89f10070d6eb17388bca976f7;p=openpower-isa.git

add fixedstoreshift.mdwn as an initial copy of fixedstore.mdwn
only indexed instructions, to be edited to add "sm" (shift amount)
https://bugs.libre-soc.org/show_bug.cgi?id=1055
---

diff --git a/openpower/isa/fixedstoreshift.mdwn b/openpower/isa/fixedstoreshift.mdwn
new file mode 100644
index 00000000..6b47b8f3
--- /dev/null
+++ b/openpower/isa/fixedstoreshift.mdwn
@@ -0,0 +1,305 @@
+<!-- This defines instructions described in PowerISA Version 3.0 B Book 1 -->
+
+<!-- This defines instructions that store from a register to RAM -->
+
+<!-- Note that these pages also define equivalent load instructions, -->
+<!-- these are described in fixedload.mdwn -->
+
+<!-- Section 3.3.3 Fixed-Point Store Instructions pages 54 - 57 -->
+<!-- Section 3.3.3.1 64-bit Fixed-Point Store Instructions page 57 -->
+<!-- Section 3.3.4 Fixed Point Load and Store Quadword Instructions pages 58 - 59 -->
+<!-- Section 3.3.5 Fixed-Point Load and Store with Byte Reversal Instructions page 60 -->
+<!-- Section 3.3.5.1 64-Bit Load and Store with Byte Reversal Instructions page 61 -->
+<!-- Section 3.3.6 Fixed-Point Load and Store Multiple Instructions page 62 -->
+
+<!-- Section 3.3.3 Fixed-Point Store Instructions pages 54 - 57 -->
+
+# Store Byte Indexed
+
+X-Form
+
+* stbx RS,RA,RB
+
+Pseudo-code:
+
+    b <- (RA|0)
+    EA <- b + (RB)
+    MEM(EA, 1) <- (RS)[XLEN-8:XLEN-1]
+
+Description:
+
+    Let the effective address (EA) be the sum
+    (RA|0)+ (RB). RS [56:63] are stored into the byte in stor-
+    age addressed by EA.
+
+Special Registers Altered:
+
+    None
+
+# Store Byte with Update Indexed
+
+X-Form
+
+* stbux RS,RA,RB
+
+Pseudo-code:
+
+    EA <- (RA) + (RB)
+    MEM(EA, 1) <- (RS)[XLEN-8:XLEN-1]
+    RA <- EA
+
+Description:
+
+    Let the effective address (EA) be the sum (RA)+ (RB).
+    RS[56:63] are stored into the byte in storage addressed
+    by EA.
+
+    EA is placed into register RA.
+
+    If RA=0, the instruction form is invalid.
+
+Special Registers Altered:
+
+    None
+
+# Store Halfword Indexed
+
+X-Form
+
+* sthx RS,RA,RB
+
+Pseudo-code:
+
+    b <- (RA|0)
+    EA <- b + (RB)
+    MEM(EA, 2) <- (RS)[XLEN-16:XLEN-1]
+
+Description:
+
+    Let the effective address (EA) be the sum
+    (RA|0)+ (RB). RS[48:63] are stored into the halfword in
+    storage addressed by EA.
+
+Special Registers Altered:
+
+    None
+
+# Store Halfword with Update Indexed
+
+X-Form
+
+* sthux RS,RA,RB
+
+Pseudo-code:
+
+    EA <- (RA) + (RB)
+    MEM(EA, 2) <- (RS)[XLEN-16:XLEN-1]
+    RA <- EA
+
+Description:
+
+    Let the effective address (EA) be the sum (RA)+ (RB).
+    RS[48:63] are stored into the halfword in storage
+    addressed by EA.
+
+    EA is placed into register RA.
+
+    If RA=0, the instruction form is invalid.
+
+Special Registers Altered:
+
+    None
+
+# Store Word Indexed
+
+X-Form
+
+* stwx RS,RA,RB
+
+Pseudo-code:
+
+    b <- (RA|0)
+    EA <- b + (RB)
+    MEM(EA, 4) <- (RS)[XLEN-32:XLEN-1]
+
+Description:
+
+    Let the effective address (EA) be the sum
+    (RA|0)+ (RB). RS[32:63] are stored into the word in stor-
+    age addressed by EA.
+
+Special Registers Altered:
+
+    None
+
+# Store Word with Update Indexed
+
+X-Form
+
+* stwux RS,RA,RB
+
+Pseudo-code:
+
+    EA <- (RA) + (RB)
+    MEM(EA, 4) <- (RS)[XLEN-32:XLEN-1]
+    RA <- EA
+
+Description:
+
+    Let the effective address (EA) be the sum (RA)+ (RB).
+    RS[32:63] are stored into the word in storage addressed
+    by EA.
+
+    EA is placed into register RA.
+
+    If RA=0, the instruction form is invalid.
+
+Special Registers Altered:
+
+    None
+
+
+
+<!-- Section 3.3.3.1 64-bit Fixed-Point Store Instructions page 57 -->
+
+# Store Doubleword Indexed
+
+X-Form
+
+* stdx RS,RA,RB
+
+Pseudo-code:
+
+    b <- (RA|0)
+    EA <- b + (RB)
+    MEM(EA, 8) <- (RS)
+
+Description:
+
+    Let the effective address (EA) be the sum
+    (RA|0)+ (RB). (RS) is stored into the doubleword in
+    storage addressed by EA.
+
+Special Registers Altered:
+
+    None
+
+# Store Doubleword with Update Indexed
+
+X-Form
+
+* stdux RS,RA,RB
+
+Pseudo-code:
+
+    EA <- (RA) + (RB)
+    MEM(EA, 8) <- (RS)
+    RA <- EA
+
+Description:
+
+    Let the effective address (EA) be the sum (RA)+ (RB).
+    (RS) is stored into the doubleword in storage
+    addressed by EA.
+
+    EA is placed into register RA.
+
+    If RA=0, the instruction form is invalid.
+
+Special Registers Altered:
+
+    None
+
+
+<!-- Section 3.3.5 Fixed-Point Load and Store with Byte Reversal Instructions page 60 -->
+
+# Store Halfword Byte-Reverse Indexed
+
+X-Form
+
+* sthbrx RS,RA,RB
+
+Pseudo-code:
+
+    b <- (RA|0)
+    EA <- b + (RB)
+    MEM(EA, 2) <- (RS) [56:63] || (RS)[48:55]
+
+Description:
+
+    Let the effective address (EA) be the sum
+    (RA|0)+ (RB). (RS)56:63 are stored into bits 0:7 of the
+    halfword in storage addressed by EA. (RS) 48:55 are
+    stored into bits 8:15 of the halfword in storage
+    addressed by EA.
+
+Special Registers Altered:
+
+    None
+
+# Store Word Byte-Reverse Indexed
+
+X-Form
+
+* stwbrx RS,RA,RB
+
+Pseudo-code:
+
+    b <- (RA|0)
+    EA <- b + (RB)
+    MEM(EA, 4) <- ((RS)[56:63] || (RS)[48:55] || (RS)[40:47]
+                   ||(RS)[32:39])
+
+Description:
+
+    Let the effective address (EA) be the sum
+    (RA|0)+ (RB). (RS)[56:63] are stored into bits 0:7 of the
+    word in storage addressed by EA. (RS) [48:55] are stored
+    into bits 8:15 of the word in storage addressed by EA.
+    (RS)[40:47] are stored into bits 16:23 of the word in stor-
+    age addressed by EA. (RS) [32:39] are stored into bits
+    24:31 of the word in storage addressed by EA.
+
+Special Registers Altered:
+
+    None
+
+<!-- Section 3.3.5.1 64-Bit Load and Store with Byte Reversal Instructions page 61 -->
+
+# Store Doubleword Byte-Reverse Indexed
+
+X-Form
+
+* stdbrx RS,RA,RB
+
+Pseudo-code:
+
+    b <- (RA|0)
+    EA <- b + (RB)
+    MEM(EA, 8) <- ((RS) [56:63] || (RS)[48:55]
+                    || (RS)[40:47] || (RS)[32:39]
+                    || (RS)[24:31] || (RS)[16:23]
+                    || (RS)[8:15]  || (RS)[0:7])
+
+Description:
+
+    Let the effective address (EA) be the sum
+    (RA|0)+ (RB). (RS)[56:63] are stored into bits 0:7 of the
+    doubleword in storage addressed by EA. (RS) [48:55] are
+    stored into bits 8:15 of the doubleword in storage
+    addressed by EA. (RS) [40:47] are stored into bits 16:23 of
+    the doubleword in storage addressed by EA. (RS) [32:39]
+    are stored into bits 23:31 of the doubleword in storage
+    addressed by EA. (RS) [24:31] are stored into bits 32:39 of
+    the doubleword in storage addressed by EA. (RS) [16:23]
+    are stored into bits 40:47 of the doubleword in storage
+    addressed by EA. (RS)[8:15] are stored into bits 48:55 of
+    the doubleword in storage addressed by EA. (RS) [0:7]
+    are stored into bits 56:63 of the doubleword in storage
+    addressed by EA.
+
+Special Registers Altered:
+
+    None
+
+<!-- Checked March 2021 -->