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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/contrib/llvm-project/compiler-rt/lib/orc/sysv_reenter.x86-64.S
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//===-- orc_rt_macho_tlv.x86-64.s -------------------------------*- ASM -*-===//

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//

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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

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// See https://llvm.org/LICENSE.txt for license information.

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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

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//

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//===----------------------------------------------------------------------===//

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//

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// This file is a part of the ORC runtime support library.

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//

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//===----------------------------------------------------------------------===//

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// The content of this file is x86_64-only

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#if defined(__x86_64__)

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// Save all GRPS except %rsp.

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// This value is also subtracted from %rsp below, despite the fact that %rbp

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// has already been pushed, because we need %rsp to stay 16-byte aligned.

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#define GPR_SAVE_SPACE_SIZE             15 * 8

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#define FXSAVE64_SAVE_SPACE_SIZE        512

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#define REGISTER_SAVE_SPACE_SIZE        \

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        GPR_SAVE_SPACE_SIZE + FXSAVE64_SAVE_SPACE_SIZE

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        .text

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        // returns address of TLV in %rax, all other registers preserved

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        .globl __orc_rt_sysv_reenter

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__orc_rt_sysv_reenter:

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        pushq           %rbp

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        movq            %rsp,        %rbp

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        subq            $REGISTER_SAVE_SPACE_SIZE, %rsp

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        movq            %rax,     -8(%rbp)

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        movq            %rbx,    -16(%rbp)

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        movq            %rcx,    -24(%rbp)

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        movq            %rdx,    -32(%rbp)

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        movq            %rsi,    -40(%rbp)

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        movq            %rdi,    -48(%rbp)

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        movq            %r8,     -56(%rbp)

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        movq            %r9,     -64(%rbp)

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        movq            %r10,    -72(%rbp)

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        movq            %r11,    -80(%rbp)

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        movq            %r12,    -88(%rbp)

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        movq            %r13,    -96(%rbp)

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        movq            %r14,   -104(%rbp)

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        movq            %r15,   -112(%rbp)

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        fxsave64        (%rsp)

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        movq            8(%rbp), %rdi

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        // Load return address and subtract five from it (on the assumption

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        // that it's a call instruction).

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        subq            $5, %rdi

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        // Call __orc_rt_resolve to look up the implementation corresponding to

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        // the calling stub, then store this in x17 (which we'll return to

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        // below).

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#if !defined(__APPLE__)

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        call            __orc_rt_resolve

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#else

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        call            ___orc_rt_resolve

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#endif

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        movq            %rax,   8(%rbp)

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        fxrstor64       (%rsp)

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        movq            -112(%rbp),     %r15

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        movq            -104(%rbp),     %r14

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        movq            -96(%rbp),      %r13

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        movq            -88(%rbp),      %r12

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        movq            -80(%rbp),      %r11

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        movq            -72(%rbp),      %r10

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        movq            -64(%rbp),      %r9

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        movq            -56(%rbp),      %r8

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        movq            -48(%rbp),      %rdi

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        movq            -40(%rbp),      %rsi

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        movq            -32(%rbp),      %rdx

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        movq            -24(%rbp),      %rcx

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        movq            -16(%rbp),      %rbx

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        movq            -8(%rbp),       %rax

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        addq            $REGISTER_SAVE_SPACE_SIZE, %rsp

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        popq            %rbp

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        ret

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#endif // defined(__x86_64__)

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