		Search-engine friendly clone of the ACL2 documentation.

Missing-parents

Exec-sw

Semantics of the SW instruction [ISA:2.6].

Signature
(exec-sw rs1 rs2 imm stat feat) → new-stat
Arguments: rs1 — Guard (ubyte5p rs1).; rs2 — Guard (ubyte5p rs2).; imm — Guard (ubyte12p imm).; stat — Guard (statp stat).; feat — Guard (featp feat).
Returns: new-stat — Type (statp new-stat).

We calculate the effective address. In 32-bit mode, we read an unsigned 32-bit integer from the rs2; in 64-bit mode, we read the low 32 bits of rs2 as an unsigned 32-bit integer. We write the integer to the effective address. We increment the program counter.

Definitions and Theorems

Function: exec-sw

(defun exec-sw (rs1 rs2 imm stat feat)
  (declare (xargs :guard (and (ubyte5p rs1)
                              (ubyte5p rs2)
                              (ubyte12p imm)
                              (statp stat)
                              (featp feat))))
  (declare (xargs :guard (stat-validp stat feat)))
  (let ((__function__ 'exec-sw))
    (declare (ignorable __function__))
    (b* ((addr (eff-addr rs1 imm stat feat))
         (val (cond ((feat-32p feat)
                     (read-xreg-unsigned (ubyte5-fix rs2)
                                         stat feat))
                    ((feat-64p feat)
                     (loghead 32
                              (read-xreg-unsigned (ubyte5-fix rs2)
                                                  stat feat)))
                    (t (impossible))))
         (stat (write-memory-unsigned32 addr val stat feat))
         (stat (inc4-pc stat feat)))
      stat)))

Theorem: statp-of-exec-sw

(defthm statp-of-exec-sw
  (b* ((new-stat (exec-sw rs1 rs2 imm stat feat)))
    (statp new-stat))
  :rule-classes :rewrite)

Theorem: exec-sw-of-ubyte5-fix-rs1

(defthm exec-sw-of-ubyte5-fix-rs1
  (equal (exec-sw (ubyte5-fix rs1)
                  rs2 imm stat feat)
         (exec-sw rs1 rs2 imm stat feat)))

Theorem: exec-sw-ubyte5-equiv-congruence-on-rs1

(defthm exec-sw-ubyte5-equiv-congruence-on-rs1
  (implies (ubyte5-equiv rs1 rs1-equiv)
           (equal (exec-sw rs1 rs2 imm stat feat)
                  (exec-sw rs1-equiv rs2 imm stat feat)))
  :rule-classes :congruence)

Theorem: exec-sw-of-ubyte5-fix-rs2

(defthm exec-sw-of-ubyte5-fix-rs2
  (equal (exec-sw rs1 (ubyte5-fix rs2)
                  imm stat feat)
         (exec-sw rs1 rs2 imm stat feat)))

Theorem: exec-sw-ubyte5-equiv-congruence-on-rs2

(defthm exec-sw-ubyte5-equiv-congruence-on-rs2
  (implies (ubyte5-equiv rs2 rs2-equiv)
           (equal (exec-sw rs1 rs2 imm stat feat)
                  (exec-sw rs1 rs2-equiv imm stat feat)))
  :rule-classes :congruence)

Theorem: exec-sw-of-ubyte12-fix-imm

(defthm exec-sw-of-ubyte12-fix-imm
  (equal (exec-sw rs1 rs2 (ubyte12-fix imm)
                  stat feat)
         (exec-sw rs1 rs2 imm stat feat)))

Theorem: exec-sw-ubyte12-equiv-congruence-on-imm

(defthm exec-sw-ubyte12-equiv-congruence-on-imm
  (implies (acl2::ubyte12-equiv imm imm-equiv)
           (equal (exec-sw rs1 rs2 imm stat feat)
                  (exec-sw rs1 rs2 imm-equiv stat feat)))
  :rule-classes :congruence)

Theorem: exec-sw-of-stat-fix-stat

(defthm exec-sw-of-stat-fix-stat
  (equal (exec-sw rs1 rs2 imm (stat-fix stat)
                  feat)
         (exec-sw rs1 rs2 imm stat feat)))

Theorem: exec-sw-stat-equiv-congruence-on-stat

(defthm exec-sw-stat-equiv-congruence-on-stat
  (implies (stat-equiv stat stat-equiv)
           (equal (exec-sw rs1 rs2 imm stat feat)
                  (exec-sw rs1 rs2 imm stat-equiv feat)))
  :rule-classes :congruence)

Theorem: exec-sw-of-feat-fix-feat

(defthm exec-sw-of-feat-fix-feat
  (equal (exec-sw rs1 rs2 imm stat (feat-fix feat))
         (exec-sw rs1 rs2 imm stat feat)))

Theorem: exec-sw-feat-equiv-congruence-on-feat

(defthm exec-sw-feat-equiv-congruence-on-feat
  (implies (feat-equiv feat feat-equiv)
           (equal (exec-sw rs1 rs2 imm stat feat)
                  (exec-sw rs1 rs2 imm stat feat-equiv)))
  :rule-classes :congruence)