Java example source code file (linux_x86_32.s)
The linux_x86_32.s Java example source code
#
# Copyright (c) 2004, 2013, Oracle and/or its affiliates. All rights reserved.
# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
#
# This code is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 2 only, as
# published by the Free Software Foundation.
#
# This code is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# version 2 for more details (a copy is included in the LICENSE file that
# accompanied this code).
#
# You should have received a copy of the GNU General Public License version
# 2 along with this work; if not, write to the Free Software Foundation,
# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
# or visit www.oracle.com if you need additional information or have any
# questions.
#
# NOTE WELL! The _Copy functions are called directly
# from server-compiler-generated code via CallLeafNoFP,
# which means that they *must* either not use floating
# point or use it in the same manner as does the server
# compiler.
.globl _Copy_conjoint_bytes
.globl _Copy_arrayof_conjoint_bytes
.globl _Copy_conjoint_jshorts_atomic
.globl _Copy_arrayof_conjoint_jshorts
.globl _Copy_conjoint_jints_atomic
.globl _Copy_arrayof_conjoint_jints
.globl _Copy_conjoint_jlongs_atomic
.globl _mmx_Copy_arrayof_conjoint_jshorts
.globl _Atomic_cmpxchg_long
.globl _Atomic_move_long
.text
.globl SpinPause
.type SpinPause,@function
.p2align 4,,15
SpinPause:
rep
nop
movl $1, %eax
ret
# Support for void Copy::conjoint_bytes(void* from,
# void* to,
# size_t count)
.p2align 4,,15
.type _Copy_conjoint_bytes,@function
_Copy_conjoint_bytes:
pushl %esi
movl 4+12(%esp),%ecx # count
pushl %edi
movl 8+ 4(%esp),%esi # from
movl 8+ 8(%esp),%edi # to
cmpl %esi,%edi
leal -1(%esi,%ecx),%eax # from + count - 1
jbe cb_CopyRight
cmpl %eax,%edi
jbe cb_CopyLeft
# copy from low to high
cb_CopyRight:
cmpl $3,%ecx
jbe 5f # <= 3 bytes
# align source address at dword address boundary
movl %ecx,%eax # original count
movl $4,%ecx
subl %esi,%ecx
andl $3,%ecx # prefix byte count
jz 1f # no prefix
subl %ecx,%eax # byte count less prefix
# copy prefix
subl %esi,%edi
0: movb (%esi),%dl
movb %dl,(%edi,%esi,1)
addl $1,%esi
subl $1,%ecx
jnz 0b
addl %esi,%edi
1: movl %eax,%ecx # byte count less prefix
shrl $2,%ecx # dword count
jz 4f # no dwords to move
cmpl $32,%ecx
jbe 2f # <= 32 dwords
# copy aligned dwords
rep; smovl
jmp 4f
# copy aligned dwords
2: subl %esi,%edi
.p2align 4,,15
3: movl (%esi),%edx
movl %edx,(%edi,%esi,1)
addl $4,%esi
subl $1,%ecx
jnz 3b
addl %esi,%edi
4: movl %eax,%ecx # byte count less prefix
5: andl $3,%ecx # suffix byte count
jz 7f # no suffix
# copy suffix
xorl %eax,%eax
6: movb (%esi,%eax,1),%dl
movb %dl,(%edi,%eax,1)
addl $1,%eax
subl $1,%ecx
jnz 6b
7: popl %edi
popl %esi
ret
# copy from high to low
cb_CopyLeft:
std
leal -4(%edi,%ecx),%edi # to + count - 4
movl %eax,%esi # from + count - 1
movl %ecx,%eax
subl $3,%esi # from + count - 4
cmpl $3,%ecx
jbe 5f # <= 3 bytes
1: shrl $2,%ecx # dword count
jz 4f # no dwords to move
cmpl $32,%ecx
ja 3f # > 32 dwords
# copy dwords, aligned or not
subl %esi,%edi
.p2align 4,,15
2: movl (%esi),%edx
movl %edx,(%edi,%esi,1)
subl $4,%esi
subl $1,%ecx
jnz 2b
addl %esi,%edi
jmp 4f
# copy dwords, aligned or not
3: rep; smovl
4: movl %eax,%ecx # byte count
5: andl $3,%ecx # suffix byte count
jz 7f # no suffix
# copy suffix
subl %esi,%edi
addl $3,%esi
6: movb (%esi),%dl
movb %dl,(%edi,%esi,1)
subl $1,%esi
subl $1,%ecx
jnz 6b
7: cld
popl %edi
popl %esi
ret
# Support for void Copy::arrayof_conjoint_bytes(void* from,
# void* to,
# size_t count)
#
# Same as _Copy_conjoint_bytes, except no source alignment check.
.p2align 4,,15
.type _Copy_arrayof_conjoint_bytes,@function
_Copy_arrayof_conjoint_bytes:
pushl %esi
movl 4+12(%esp),%ecx # count
pushl %edi
movl 8+ 4(%esp),%esi # from
movl 8+ 8(%esp),%edi # to
cmpl %esi,%edi
leal -1(%esi,%ecx),%eax # from + count - 1
jbe acb_CopyRight
cmpl %eax,%edi
jbe acb_CopyLeft
# copy from low to high
acb_CopyRight:
cmpl $3,%ecx
jbe 5f
1: movl %ecx,%eax
shrl $2,%ecx
jz 4f
cmpl $32,%ecx
ja 3f
# copy aligned dwords
subl %esi,%edi
.p2align 4,,15
2: movl (%esi),%edx
movl %edx,(%edi,%esi,1)
addl $4,%esi
subl $1,%ecx
jnz 2b
addl %esi,%edi
jmp 4f
# copy aligned dwords
3: rep; smovl
4: movl %eax,%ecx
5: andl $3,%ecx
jz 7f
# copy suffix
xorl %eax,%eax
6: movb (%esi,%eax,1),%dl
movb %dl,(%edi,%eax,1)
addl $1,%eax
subl $1,%ecx
jnz 6b
7: popl %edi
popl %esi
ret
acb_CopyLeft:
std
leal -4(%edi,%ecx),%edi # to + count - 4
movl %eax,%esi # from + count - 1
movl %ecx,%eax
subl $3,%esi # from + count - 4
cmpl $3,%ecx
jbe 5f
1: shrl $2,%ecx
jz 4f
cmpl $32,%ecx
jbe 2f # <= 32 dwords
rep; smovl
jmp 4f
.space 8
2: subl %esi,%edi
.p2align 4,,15
3: movl (%esi),%edx
movl %edx,(%edi,%esi,1)
subl $4,%esi
subl $1,%ecx
jnz 3b
addl %esi,%edi
4: movl %eax,%ecx
5: andl $3,%ecx
jz 7f
subl %esi,%edi
addl $3,%esi
6: movb (%esi),%dl
movb %dl,(%edi,%esi,1)
subl $1,%esi
subl $1,%ecx
jnz 6b
7: cld
popl %edi
popl %esi
ret
# Support for void Copy::conjoint_jshorts_atomic(void* from,
# void* to,
# size_t count)
.p2align 4,,15
.type _Copy_conjoint_jshorts_atomic,@function
_Copy_conjoint_jshorts_atomic:
pushl %esi
movl 4+12(%esp),%ecx # count
pushl %edi
movl 8+ 4(%esp),%esi # from
movl 8+ 8(%esp),%edi # to
cmpl %esi,%edi
leal -2(%esi,%ecx,2),%eax # from + count*2 - 2
jbe cs_CopyRight
cmpl %eax,%edi
jbe cs_CopyLeft
# copy from low to high
cs_CopyRight:
# align source address at dword address boundary
movl %esi,%eax # original from
andl $3,%eax # either 0 or 2
jz 1f # no prefix
# copy prefix
subl $1,%ecx
jl 5f # zero count
movw (%esi),%dx
movw %dx,(%edi)
addl %eax,%esi # %eax == 2
addl %eax,%edi
1: movl %ecx,%eax # word count less prefix
sarl %ecx # dword count
jz 4f # no dwords to move
cmpl $32,%ecx
jbe 2f # <= 32 dwords
# copy aligned dwords
rep; smovl
jmp 4f
# copy aligned dwords
2: subl %esi,%edi
.p2align 4,,15
3: movl (%esi),%edx
movl %edx,(%edi,%esi,1)
addl $4,%esi
subl $1,%ecx
jnz 3b
addl %esi,%edi
4: andl $1,%eax # suffix count
jz 5f # no suffix
# copy suffix
movw (%esi),%dx
movw %dx,(%edi)
5: popl %edi
popl %esi
ret
# copy from high to low
cs_CopyLeft:
std
leal -4(%edi,%ecx,2),%edi # to + count*2 - 4
movl %eax,%esi # from + count*2 - 2
movl %ecx,%eax
subl $2,%esi # from + count*2 - 4
1: sarl %ecx # dword count
jz 4f # no dwords to move
cmpl $32,%ecx
ja 3f # > 32 dwords
subl %esi,%edi
.p2align 4,,15
2: movl (%esi),%edx
movl %edx,(%edi,%esi,1)
subl $4,%esi
subl $1,%ecx
jnz 2b
addl %esi,%edi
jmp 4f
3: rep; smovl
4: andl $1,%eax # suffix count
jz 5f # no suffix
# copy suffix
addl $2,%esi
addl $2,%edi
movw (%esi),%dx
movw %dx,(%edi)
5: cld
popl %edi
popl %esi
ret
# Support for void Copy::arrayof_conjoint_jshorts(void* from,
# void* to,
# size_t count)
.p2align 4,,15
.type _Copy_arrayof_conjoint_jshorts,@function
_Copy_arrayof_conjoint_jshorts:
pushl %esi
movl 4+12(%esp),%ecx # count
pushl %edi
movl 8+ 4(%esp),%esi # from
movl 8+ 8(%esp),%edi # to
cmpl %esi,%edi
leal -2(%esi,%ecx,2),%eax # from + count*2 - 2
jbe acs_CopyRight
cmpl %eax,%edi
jbe acs_CopyLeft
acs_CopyRight:
movl %ecx,%eax # word count
sarl %ecx # dword count
jz 4f # no dwords to move
cmpl $32,%ecx
jbe 2f # <= 32 dwords
# copy aligned dwords
rep; smovl
jmp 4f
# copy aligned dwords
.space 5
2: subl %esi,%edi
.p2align 4,,15
3: movl (%esi),%edx
movl %edx,(%edi,%esi,1)
addl $4,%esi
subl $1,%ecx
jnz 3b
addl %esi,%edi
4: andl $1,%eax # suffix count
jz 5f # no suffix
# copy suffix
movw (%esi),%dx
movw %dx,(%edi)
5: popl %edi
popl %esi
ret
acs_CopyLeft:
std
leal -4(%edi,%ecx,2),%edi # to + count*2 - 4
movl %eax,%esi # from + count*2 - 2
movl %ecx,%eax
subl $2,%esi # from + count*2 - 4
sarl %ecx # dword count
jz 4f # no dwords to move
cmpl $32,%ecx
ja 3f # > 32 dwords
subl %esi,%edi
.p2align 4,,15
2: movl (%esi),%edx
movl %edx,(%edi,%esi,1)
subl $4,%esi
subl $1,%ecx
jnz 2b
addl %esi,%edi
jmp 4f
3: rep; smovl
4: andl $1,%eax # suffix count
jz 5f # no suffix
# copy suffix
addl $2,%esi
addl $2,%edi
movw (%esi),%dx
movw %dx,(%edi)
5: cld
popl %edi
popl %esi
ret
# Support for void Copy::conjoint_jints_atomic(void* from,
# void* to,
# size_t count)
# Equivalent to
# arrayof_conjoint_jints
.p2align 4,,15
.type _Copy_conjoint_jints_atomic,@function
.type _Copy_arrayof_conjoint_jints,@function
_Copy_conjoint_jints_atomic:
_Copy_arrayof_conjoint_jints:
pushl %esi
movl 4+12(%esp),%ecx # count
pushl %edi
movl 8+ 4(%esp),%esi # from
movl 8+ 8(%esp),%edi # to
cmpl %esi,%edi
leal -4(%esi,%ecx,4),%eax # from + count*4 - 4
jbe ci_CopyRight
cmpl %eax,%edi
jbe ci_CopyLeft
ci_CopyRight:
cmpl $32,%ecx
jbe 2f # <= 32 dwords
rep; smovl
popl %edi
popl %esi
ret
.space 10
2: subl %esi,%edi
jmp 4f
.p2align 4,,15
3: movl (%esi),%edx
movl %edx,(%edi,%esi,1)
addl $4,%esi
4: subl $1,%ecx
jge 3b
popl %edi
popl %esi
ret
ci_CopyLeft:
std
leal -4(%edi,%ecx,4),%edi # to + count*4 - 4
cmpl $32,%ecx
ja 4f # > 32 dwords
subl %eax,%edi # eax == from + count*4 - 4
jmp 3f
.p2align 4,,15
2: movl (%eax),%edx
movl %edx,(%edi,%eax,1)
subl $4,%eax
3: subl $1,%ecx
jge 2b
cld
popl %edi
popl %esi
ret
4: movl %eax,%esi # from + count*4 - 4
rep; smovl
cld
popl %edi
popl %esi
ret
# Support for void Copy::conjoint_jlongs_atomic(jlong* from,
# jlong* to,
# size_t count)
#
# 32-bit
#
# count treated as signed
#
# if (from > to) {
# while (--count >= 0) {
# *to++ = *from++;
# }
# } else {
# while (--count >= 0) {
# to[count] = from[count];
# }
# }
.p2align 4,,15
.type _Copy_conjoint_jlongs_atomic,@function
_Copy_conjoint_jlongs_atomic:
movl 4+8(%esp),%ecx # count
movl 4+0(%esp),%eax # from
movl 4+4(%esp),%edx # to
cmpl %eax,%edx
jae cla_CopyLeft
cla_CopyRight:
subl %eax,%edx
jmp 2f
.p2align 4,,15
1: fildll (%eax)
fistpll (%edx,%eax,1)
addl $8,%eax
2: subl $1,%ecx
jge 1b
ret
.p2align 4,,15
3: fildll (%eax,%ecx,8)
fistpll (%edx,%ecx,8)
cla_CopyLeft:
subl $1,%ecx
jge 3b
ret
# Support for void Copy::arrayof_conjoint_jshorts(void* from,
# void* to,
# size_t count)
.p2align 4,,15
.type _mmx_Copy_arrayof_conjoint_jshorts,@function
_mmx_Copy_arrayof_conjoint_jshorts:
pushl %esi
movl 4+12(%esp),%ecx
pushl %edi
movl 8+ 4(%esp),%esi
movl 8+ 8(%esp),%edi
cmpl %esi,%edi
leal -2(%esi,%ecx,2),%eax
jbe mmx_acs_CopyRight
cmpl %eax,%edi
jbe mmx_acs_CopyLeft
mmx_acs_CopyRight:
movl %ecx,%eax
sarl %ecx
je 5f
cmpl $33,%ecx
jae 3f
1: subl %esi,%edi
.p2align 4,,15
2: movl (%esi),%edx
movl %edx,(%edi,%esi,1)
addl $4,%esi
subl $1,%ecx
jnz 2b
addl %esi,%edi
jmp 5f
3: smovl # align to 8 bytes, we know we are 4 byte aligned to start
subl $1,%ecx
4: .p2align 4,,15
movq 0(%esi),%mm0
addl $64,%edi
movq 8(%esi),%mm1
subl $16,%ecx
movq 16(%esi),%mm2
movq %mm0,-64(%edi)
movq 24(%esi),%mm0
movq %mm1,-56(%edi)
movq 32(%esi),%mm1
movq %mm2,-48(%edi)
movq 40(%esi),%mm2
movq %mm0,-40(%edi)
movq 48(%esi),%mm0
movq %mm1,-32(%edi)
movq 56(%esi),%mm1
movq %mm2,-24(%edi)
movq %mm0,-16(%edi)
addl $64,%esi
movq %mm1,-8(%edi)
cmpl $16,%ecx
jge 4b
emms
testl %ecx,%ecx
ja 1b
5: andl $1,%eax
je 7f
6: movw (%esi),%dx
movw %dx,(%edi)
7: popl %edi
popl %esi
ret
mmx_acs_CopyLeft:
std
leal -4(%edi,%ecx,2),%edi
movl %eax,%esi
movl %ecx,%eax
subl $2,%esi
sarl %ecx
je 4f
cmpl $32,%ecx
ja 3f
subl %esi,%edi
.p2align 4,,15
2: movl (%esi),%edx
movl %edx,(%edi,%esi,1)
subl $4,%esi
subl $1,%ecx
jnz 2b
addl %esi,%edi
jmp 4f
3: rep; smovl
4: andl $1,%eax
je 6f
addl $2,%esi
addl $2,%edi
5: movw (%esi),%dx
movw %dx,(%edi)
6: cld
popl %edi
popl %esi
ret
# Support for jlong Atomic::cmpxchg(jlong exchange_value,
# volatile jlong* dest,
# jlong compare_value,
# bool is_MP)
#
.p2align 4,,15
.type _Atomic_cmpxchg_long,@function
_Atomic_cmpxchg_long:
# 8(%esp) : return PC
pushl %ebx # 4(%esp) : old %ebx
pushl %edi # 0(%esp) : old %edi
movl 12(%esp), %ebx # 12(%esp) : exchange_value (low)
movl 16(%esp), %ecx # 16(%esp) : exchange_value (high)
movl 24(%esp), %eax # 24(%esp) : compare_value (low)
movl 28(%esp), %edx # 28(%esp) : compare_value (high)
movl 20(%esp), %edi # 20(%esp) : dest
cmpl $0, 32(%esp) # 32(%esp) : is_MP
je 1f
lock
1: cmpxchg8b (%edi)
popl %edi
popl %ebx
ret
# Support for jlong Atomic::load and Atomic::store.
# void _Atomic_move_long(volatile jlong* src, volatile jlong* dst)
.p2align 4,,15
.type _Atomic_move_long,@function
_Atomic_move_long:
movl 4(%esp), %eax # src
fildll (%eax)
movl 8(%esp), %eax # dest
fistpll (%eax)
ret
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