313 lines
10 KiB
ArmAsm
313 lines
10 KiB
ArmAsm
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// TITLE("Unaligned Branch Tests")
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//++
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//
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// Copyright (c) 1991 Microsoft Corporation
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//
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// Module Name:
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//
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// alignx.s
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//
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// Abstract:
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//
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// This module implements the unaligned branch tests.
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//
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// Author:
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//
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// David N. Cutler (davec) 27-Feb-1991
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//
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// Environment:
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//
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// User mode only.
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//
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// Revision History:
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//
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//--
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#include "ksmips.h"
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SBTTL("Unaligned BEQ/BNE/BC1F/BC1T Branch Tests")
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//++
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//
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// Routine Description:
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//
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// The following routines implement beq/bne/bc1f/bc1t tests with an unaligned
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// load word instruction in the delay slot.
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//
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// Arguments:
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//
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// a0 - Supplies first operand for branch test.
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// a1 - Supplies second operate for branch test.
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// a2 - Supplies a pointer to an unaligned word.
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// a3 - Supplies a pointer to an aligned word that receives the result
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// of the unaligned load.
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//
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// Return Value:
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//
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// A value of true is returned in the brancd was taken. Otherwise,
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// FALSE is returned.
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//
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//--
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LEAF_ENTRY(Beq)
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.set noreorder
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li v0,1 // set branched true
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beq a0,a1,10f // if eq, branch
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lw v1,0(a2) // load unaligned data
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move v0,zero // set branched false
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10: j ra // return
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sw v1,0(a3) // store unaligned value
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.set reorder
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.end Beq
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LEAF_ENTRY(Bne)
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.set noreorder
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li v0,1 // set branched true
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bne a0,a1,10f // if eq, branch
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lw v1,0(a2) // load unaligned data
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move v0,zero // set branched false
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10: j ra // return
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sw v1,0(a3) // store unaligned value
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.set reorder
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.end Bne
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LEAF_ENTRY(Bc1f)
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.set noreorder
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mtc1 a0,f0 // set comparand 1
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mtc1 a1,f2 // set comparand 2
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li v0,1 // set branched true
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c.eq.s f0,f2 // compare for equality
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bc1f 10f // if f, branch
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lw v1,0(a2) // load unaligned data
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move v0,zero // set branched false
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10: j ra // return
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sw v1,0(a3) // store unaligned value
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.set reorder
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.end Bc1f
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LEAF_ENTRY(Bc1t)
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.set noreorder
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mtc1 a0,f0 // set comparand 1
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mtc1 a1,f2 // set comparand 2
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li v0,1 // set branched true
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c.eq.s f0,f2 // compare for equality
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bc1t 10f // if t, branch
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lw v1,0(a2) // load unaligned data
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move v0,zero // set branched false
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10: j ra // return
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sw v1,0(a3) // store unaligned value
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.set reorder
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.end Bc1t
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SBTTL("Unaligned BLEZ/BLTZ/BGEZ/BGTZ/BGEZAL/BLTZAL Branch Tests")
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//++
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//
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// Routine Description:
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//
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// The following routines implement blez/bltz/bgez/bgtz/bgezal/bltzal
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// tests with an unaligned load word instruction in the delay slot.
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//
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// Arguments:
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//
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// a0 - Supplies the operand for branch test.
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// a1 - Supplies a pointer to an unaligned word.
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// a2 - Supplies a pointer to an aligned word that receives the result
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// of the unaligned load.
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//
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// Return Value:
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//
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// A value of true is returned in the branch was taken. Otherwise,
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// FALSE is returned.
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//
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//--
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LEAF_ENTRY(Blez)
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.set noreorder
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li v0,1 // set branched true
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blez a0,10f // if lez, branch
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lw v1,0(a1) // load unaligned data
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move v0,zero // set branched false
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10: j ra // return
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sw v1,0(a2) // store unaligned value
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.set reorder
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.end Blez
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LEAF_ENTRY(Bltz)
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.set noreorder
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li v0,1 // set branched true
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bltz a0,10f // if ltz, branch
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lw v1,0(a1) // load unaligned data
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move v0,zero // set branched false
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10: j ra // return
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sw v1,0(a2) // store unaligned value
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.set reorder
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.end Bltz
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LEAF_ENTRY(Bgez)
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.set noreorder
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li v0,1 // set branched true
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bgez a0,10f // if gez, branch
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lw v1,0(a1) // load unaligned data
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move v0,zero // set branched false
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10: j ra // return
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sw v1,0(a2) // store unaligned value
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.set reorder
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.end Bgez
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LEAF_ENTRY(Bgtz)
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.set noreorder
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li v0,1 // set branched true
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bgtz a0,10f // if gtz, branch
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lw v1,0(a1) // load unaligned data
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move v0,zero // set branched false
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10: j ra // return
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sw v1,0(a2) // store unaligned value
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.set reorder
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.end Bgtz
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LEAF_ENTRY(Bgezal)
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.set noreorder
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sw ra,4 * 4(sp) // save return address
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move v0,zero // set branched false
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bgezal a0,10f // if gez, branch and link
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lw v1,0(a1) // load unaligned data
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lw ra,4 * 4(sp) // restore return address
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sw v1,0(a2) // store unaligned value
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j ra // return
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nop //
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10: j ra // return
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li v0,1 // set branched true
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.set reorder
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.end Bgezal
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LEAF_ENTRY(Bltzal)
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.set noreorder
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sw ra,4 * 4(sp) // save return address
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move v0,zero // set branched false
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bltzal a0,10f // if ltz, branch and link
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lw v1,0(a1) // load unaligned data
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lw ra,4 * 4(sp) // restore return address
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sw v1,0(a2) // store unaligned value
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j ra // return
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nop //
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10: j ra // return
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li v0,1 // set branched true
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.set reorder
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.end Bltzal
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SBTTL("Unaligned JAL/J Tests")
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//++
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//
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// Routine Description:
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//
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// The following routines implement jal/j tests with an unaligned
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// load word instruction in the delay slot.
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//
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// Arguments:
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//
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// a0 - Supplies a pointer to an unaligned word.
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// a1 - Supplies a pointer to an aligned word that receives the result
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// of the unaligned load.
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//
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// Return Value:
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//
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// A value of true is returned in the brancd was taken. Otherwise,
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// FALSE is returned.
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//
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//--
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LEAF_ENTRY(Jal)
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.set noreorder
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sw ra,4 * 4(sp) // save return address
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move v0,zero // set branched false
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jal 10f // jump and link
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lw v1,0(a0) // load unaligned data
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lw ra,4 * 4(sp) // restore return address
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sw v1,0(a1) // store unaligned value
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j ra // return
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nop //
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10: j ra // return
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li v0,1 // set branched true
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.set reorder
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.end Jal
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LEAF_ENTRY(Jalr)
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.set noreorder
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sw ra,4 * 4(sp) // save return address
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move v0,zero // set branched false
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la t0,10f // get destination address
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jal t0 // jump
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lw v1,0(a0) // load unaligned data
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lw ra,4 * 4(sp) // restore return address
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sw v1,0(a1) // store unaligned value
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j ra // return
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nop //
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10: j ra // jump back
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li v0,1 // set branched true
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.set reorder
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.end Jalr
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LEAF_ENTRY(J)
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.set noreorder
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sw ra,4 * 4(sp) // save return address
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move v0,zero // set branched false
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j 10f // jump
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lw v1,0(a0) // load unaligned data
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20: lw ra,4 * 4(sp) // restore return address
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sw v1,0(a1) // store unaligned value
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j ra // return
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nop //
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10: j 20b // jump back
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li v0,1 // set branched true
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.set reorder
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.end J
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LEAF_ENTRY(Jr)
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.set noreorder
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sw ra,4 * 4(sp) // save return address
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move v0,zero // set branched false
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la t0,10f // get destination address
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j t0 // jump
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lw v1,0(a0) // load unaligned data
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20: lw ra,4 * 4(sp) // restore return address
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sw v1,0(a1) // store unaligned value
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j ra // return
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nop //
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10: j 20b // return
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li v0,1 // set branched true
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.set reorder
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.end Jr
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