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Add atomic_sub_* functions to libspl.

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Both the SPL and the ZFS libspl export most of the atomic_* functions,
except atomic_sub_* functions which are only exported by the SPL, not by
libspl. This patch remedies that by implementing atomic_sub_* functions
in libspl.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1013
This commit is contained in:
Etienne Dechamps
2012-06-27 10:26:49 +02:00
committed by Brian Behlendorf
parent 82f46731fd
commit 142e6dd100
4 changed files with 284 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/libspl/asm-i386/atomic.S
+106
View File
@@ -271,6 +271,40 @@
SET_SIZE(atomic_add_int)
SET_SIZE(atomic_add_32)
ENTRY(atomic_sub_8)
ALTENTRY(atomic_sub_char)
movl 4(%esp), %eax
movl 8(%esp), %ecx
lock
subb %cl, (%eax)
ret
SET_SIZE(atomic_sub_char)
SET_SIZE(atomic_sub_8)
ENTRY(atomic_sub_16)
ALTENTRY(atomic_sub_short)
movl 4(%esp), %eax
movl 8(%esp), %ecx
lock
subw %cx, (%eax)
ret
SET_SIZE(atomic_sub_short)
SET_SIZE(atomic_sub_16)
ENTRY(atomic_sub_32)
ALTENTRY(atomic_sub_int)
ALTENTRY(atomic_sub_ptr)
ALTENTRY(atomic_sub_long)
movl 4(%esp), %eax
movl 8(%esp), %ecx
lock
subl %ecx, (%eax)
ret
SET_SIZE(atomic_sub_long)
SET_SIZE(atomic_sub_ptr)
SET_SIZE(atomic_sub_int)
SET_SIZE(atomic_sub_32)
ENTRY(atomic_or_8)
ALTENTRY(atomic_or_uchar)
movl 4(%esp), %eax
@@ -384,6 +418,55 @@
SET_SIZE(atomic_add_int_nv)
SET_SIZE(atomic_add_32_nv)
ENTRY(atomic_sub_8_nv)
ALTENTRY(atomic_sub_char_nv)
movl 4(%esp), %edx
movb (%edx), %al
1:
movl 8(%esp), %ecx
subb %al, %cl
lock
cmpxchgb %cl, (%edx)
jne 1b
movzbl %cl, %eax
ret
SET_SIZE(atomic_sub_char_nv)
SET_SIZE(atomic_sub_8_nv)
ENTRY(atomic_sub_16_nv)
ALTENTRY(atomic_sub_short_nv)
movl 4(%esp), %edx
movw (%edx), %ax
1:
movl 8(%esp), %ecx
subw %ax, %cx
lock
cmpxchgw %cx, (%edx)
jne 1b
movzwl %cx, %eax
ret
SET_SIZE(atomic_sub_short_nv)
SET_SIZE(atomic_sub_16_nv)
ENTRY(atomic_sub_32_nv)
ALTENTRY(atomic_sub_int_nv)
ALTENTRY(atomic_sub_ptr_nv)
ALTENTRY(atomic_sub_long_nv)
movl 4(%esp), %edx
movl (%edx), %eax
1:
movl 8(%esp), %ecx
subl %eax, %ecx
lock
cmpxchgl %ecx, (%edx)
jne 1b
movl %ecx, %eax
ret
SET_SIZE(atomic_sub_long_nv)
SET_SIZE(atomic_sub_ptr_nv)
SET_SIZE(atomic_sub_int_nv)
SET_SIZE(atomic_sub_32_nv)
/*
* NOTE: If atomic_add_64 and atomic_add_64_nv are ever
* separated, it is important to edit the libc i386 platform
@@ -413,6 +496,29 @@
SET_SIZE(atomic_add_64_nv)
SET_SIZE(atomic_add_64)
ENTRY(atomic_sub_64)
ALTENTRY(atomic_sub_64_nv)
pushl %edi
pushl %ebx
movl 12(%esp), %edi
movl (%edi), %eax
movl 4(%edi), %edx
1:
movl 16(%esp), %ebx
movl 20(%esp), %ecx
subl %eax, %ebx
adcl %edx, %ecx
lock
cmpxchg8b (%edi)
jne 1b
movl %ebx, %eax
movl %ecx, %edx
popl %ebx
popl %edi
ret
SET_SIZE(atomic_sub_64_nv)
SET_SIZE(atomic_sub_64)
ENTRY(atomic_or_8_nv)
ALTENTRY(atomic_or_uchar_nv)
movl 4(%esp), %edx