threadLocalHelpers.s [plain text]
/*
* Copyright (c) 2010 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#if __x86_64__
// returns address of TLV in %rax, all other registers preserved
.globl _tlv_get_addr
.private_extern _tlv_get_addr
_tlv_get_addr:
movq 8(%rdi),%rax // get key from descriptor
movq %gs:0x0(,%rax,8),%rax // get thread value
testq %rax,%rax // if NULL, lazily allocate
je LlazyAllocate
addq 16(%rdi),%rax // add offset from descriptor
ret
LlazyAllocate:
pushq %rbp
movq %rsp, %rbp
subq $592,%rsp
movq %rdi,-8(%rbp)
movq %rsi,-16(%rbp)
movq %rdx,-24(%rbp)
movq %rcx,-32(%rbp)
movq %r8,-40(%rbp)
movq %r9,-48(%rbp)
movq %r10,-56(%rbp)
movq %r11,-64(%rbp)
fxsave -592(%rbp)
movq 8(%rdi),%rdi // get key from descriptor
call _tlv_allocate_and_initialize_for_key
fxrstor -592(%rbp)
movq -64(%rbp),%r11
movq -56(%rbp),%r10
movq -48(%rbp),%r9
movq -40(%rbp),%r8
movq -32(%rbp),%rcx
movq -24(%rbp),%rdx
movq -16(%rbp),%rsi
movq -8(%rbp),%rdi
addq 16(%rdi),%rax // result = buffer + offset
addq $592,%rsp
popq %rbp
ret
#endif
#if __i386__
// returns address of TLV in %eax, all other registers (except %ecx) preserved
.globl _tlv_get_addr
.private_extern _tlv_get_addr
_tlv_get_addr:
movl 4(%eax),%ecx // get key from descriptor
movl %gs:0x0(,%ecx,4),%ecx // get thread value
testl %ecx,%ecx // if NULL, lazily allocate
je LlazyAllocate
movl 8(%eax),%eax // add offset from descriptor
addl %ecx,%eax
ret
LlazyAllocate:
pushl %ebp
movl %esp,%ebp
pushl %edx // save edx
subl $548,%esp
movl %eax,-8(%ebp) // save descriptor
lea -528(%ebp),%ecx // get 512 byte buffer in frame
and $-16, %ecx // 16-byte align buffer for fxsave
fxsave (%ecx)
movl 4(%eax),%ecx // get key from descriptor
movl %ecx,(%esp) // push key parameter, also leaves stack aligned properly
call _tlv_allocate_and_initialize_for_key
movl -8(%ebp),%ecx // get descriptor
movl 8(%ecx),%ecx // get offset from descriptor
addl %ecx,%eax // add offset to buffer
lea -528(%ebp),%ecx
and $-16, %ecx // 16-byte align buffer for fxrstor
fxrstor (%ecx)
addl $548,%esp
popl %edx // restore edx
popl %ebp
ret
#endif
#if 0
#if __arm__
// returns address of TLV in r0, all other registers preserved
.globl _tlv_get_addr
.private_extern _tlv_get_addr
_tlv_get_addr:
push {r1,r2,r3,r7,lr}
mov r7,r0 // save descriptor in r7
ldr r0, [r7, #4] // get key from descriptor
bl _pthread_getspecific // get thread value
cmp r0, #0
bne L2 // if NULL, lazily allocate
ldr r0, [r7, #4] // get key from descriptor
bl _tlv_allocate_and_initialize_for_key
L2: ldr r1, [r7, #8] // get offset from descriptor
add r0, r1, r0 // add offset into allocation block
pop {r1,r2,r3,r7,pc}
#endif
#endif