The Tor Browser: xpcom/reflect/xptcall/src/md/unix/xptcstubs_asm_sparcv9

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

     1 /* -*- Mode: asm; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-

     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, 0x7ff + 136, %o2  ! previous stack top adjusted to the first argument slot (beyond 'this')

    23 ! save off the original incoming parameters that arrived in

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

    25         stx     %i1, [%fp + 0x7ff + 136]

    26         stx     %i2, [%fp + 0x7ff + 144]

    27         stx     %i3, [%fp + 0x7ff + 152]

    28         stx     %i4, [%fp + 0x7ff + 160]

    29         stx     %i5, [%fp + 0x7ff + 168]

    30 ! now we can build our own stack frame

    31         save    %sp,-(128 + 64),%sp    ! room for the register window and

    32                                        ! struct pointer, rounded up to 0 % 64

    33 ! our function now appears to have been called

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

    35 ! so we can just copy these through

    37         mov     %i0, %o0

    38         mov     %i1, %o1

    39         mov     %i2, %o2

    40         call    PrepareAndDispatch

    41         nop

    42         mov     %o0,%i0             ! propagate return value

    43         b .LL1

    44         nop

    45 .LL1:

    46         ret

    47         restore

    49        .size    SharedStub, .-SharedStub

    50        .type    SharedStub, #function

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