Add atomic_sub_* functions to libspl.

[zfs.git] / lib / libspl / asm-i386 / atomic.S

diff --git a/lib/libspl/asm-i386/atomic.S b/lib/libspl/asm-i386/atomic.S
index 93c04bf..d3d4250 100644 (file)
--- a/lib/libspl/asm-i386/atomic.S
+++ b/lib/libspl/asm-i386/atomic.S
@@ -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