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

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

     1         .LEVEL  1.1

     3 curframesz  .EQU 128

     4 ; SharedStub has stack size of 128 bytes

     6 lastframesz .EQU 64

     7 ; the StubN C++ function has a small stack size of 64 bytes

     9         .SPACE  $TEXT$,SORT=8

    10         .SUBSPA $CODE$,QUAD=0,ALIGN=4,ACCESS=0x2c,CODE_ONLY,SORT=24

    11 SharedStub

    12         .PROC

    13         .CALLINFO CALLER,FRAME=80,SAVE_RP,ARGS_SAVED

    15   .ENTRY

    16         STW     %rp,-20(%sp)

    17         LDO     128(%sp),%sp

    19         STW     %r19,-32(%r30)

    20         STW     %r26,-36-curframesz(%r30) ; save arg0 in previous frame

    22         LDO     -80(%r30),%r28

    23         FSTD,MA %fr5,8(%r28)   ; save darg0

    24         FSTD,MA %fr7,8(%r28)   ; save darg1

    25         FSTW,MA %fr4L,4(%r28)  ; save farg0

    26         FSTW,MA %fr5L,4(%r28)  ; save farg1

    27         FSTW,MA %fr6L,4(%r28)  ; save farg2

    28         FSTW,MA %fr7L,4(%r28)  ; save farg3

    30         ; Former value of register 26 is already properly saved by StubN,

    31         ; but register 25-23 are not because of the arguments mismatch

    32         STW     %r25,-40-curframesz-lastframesz(%r30) ; save r25

    33         STW     %r24,-44-curframesz-lastframesz(%r30) ; save r24

    34         STW     %r23,-48-curframesz-lastframesz(%r30) ; save r23

    35         COPY    %r26,%r25                             ; method index is arg1

    36         LDW     -36-curframesz-lastframesz(%r30),%r26 ; self is arg0

    37         LDO     -40-curframesz-lastframesz(%r30),%r24 ; normal args is arg2

    38         LDO     -80(%r30),%r23                        ; floating args is arg3

    40         BL      .+8,%r2

    41         ADDIL   L'PrepareAndDispatch-$PIC_pcrel$0+4,%r2

    42         LDO     R'PrepareAndDispatch-$PIC_pcrel$1+8(%r1),%r1

    43 $PIC_pcrel$0

    44         LDSID   (%r1),%r31

    45 $PIC_pcrel$1

    46         MTSP    %r31,%sr0

    47         .CALL   ARGW0=GR,ARGW1=GR,ARGW2=GR,ARGW3=GR,RTNVAL=GR

    48 ;in=23-26;out=28;

    49         BLE     0(%sr0,%r1)

    50         COPY    %r31,%r2

    52         LDW     -32(%r30),%r19

    54         LDW     -148(%sp),%rp

    55         BVE     (%rp)

    56   .EXIT

    57         LDO     -128(%sp),%sp

    60         .PROCEND        ;in=26;out=28;

    62   .ALIGN  8

    63         .SPACE  $TEXT$

    64         .SUBSPA $CODE$

    65         .IMPORT PrepareAndDispatch,CODE

    66         .EXPORT SharedStub,ENTRY,PRIV_LEV=3,ARGW0=GR,RTNVAL=GR,LONG_RETURN

    67         .END

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