The Tor Browser: xpcom/reflect/xptcall/src/md/unix/xptcstubs_asm_sparc

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-

     2  *

     3  * This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7         .global SharedStub

     9 /*

    10     in the frame for the function that called SharedStub are the

    11     rest of the parameters we need

    13 */

    15 SharedStub:

    16 ! we don't create a new frame yet, but work within the frame of the calling

    17 ! function to give ourselves the other parameters we want

    19         mov     %o0, %o1            ! shuffle the index up to 2nd place

    20         mov     %i0, %o0            ! the original 'this'

    21         add     %fp, 72, %o2        ! previous stack top adjusted to the first argument slot (beyond 'this')

    22 ! save off the original incoming parameters that arrived in

    23 ! registers, the ABI guarantees the space for us to do this

    24         st      %i1, [%fp + 72]

    25         st      %i2, [%fp + 76]

    26         st      %i3, [%fp + 80]

    27         st      %i4, [%fp + 84]

    28         st      %i5, [%fp + 88]

    29 ! now we can build our own stack frame

    30         save    %sp,-(64 + 32),%sp   ! room for the register window and

    31                                     ! struct pointer, rounded up to 0 % 32

    32 ! our function now appears to have been called

    33 ! as SharedStub(nsISupports* that, uint32_t index, uint32_t* args)

    34 ! so we can just copy these through

    36         mov     %i0, %o0

    37         mov     %i1, %o1

    38         mov     %i2, %o2

    39         call    PrepareAndDispatch

    40         nop

    41         mov     %o0,%i0             ! propagate return value

    42         b .LL1

    43         nop

    44 .LL1:

    45         ret

    46         restore

    48        .size    SharedStub, .-SharedStub

    49        .type    SharedStub, #function

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