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ArmAsm

//===-- orc_rt_elfnix_tls_systemz.s -------------------------------*- ASM -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of the ORC runtime support library.
//
//===----------------------------------------------------------------------===//
// The special thing about the s390 TLS ABI is that we do not have the
// standard __tls_get_addr function but the __tls_get_offset function
// which differs in two important aspects:
// 1) __tls_get_offset gets a got offset instead of a pointer to the
// tls_index structure
// 2) __tls_get_offset returns the offset of the requested variable to
// the thread descriptor instead of a pointer to the variable.
// The content of this file is systemz-only
#if defined(__s390x__)
.text
// returns offset of TLV from TP in %r2.
.globl ___orc_rt_elfnix_tls_get_offset
___orc_rt_elfnix_tls_get_offset:
stmg %r14, %r15, 112(%r15)
aghi %r15, -160
// Pass pointer to tls_index.
la %r2, 0(%r2, %r12)
brasl %r14, __orc_rt_elfnix_tls_get_addr_impl
// Return offset from TP.
ear %r0, %a0
sllg %r0, %r0, 32
ear %r0, %a1
sgr %r2, %r0
lmg %r14, %r15, 272(%r15)
br %r14
#endif // defined(__s390x__)