michael@0: /* -*- Mode: asm; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  *
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /*
michael@0:     Platform specific code to invoke XPCOM methods on native objects
michael@0:     for sparcv9 Solaris.
michael@0: 
michael@0:     See the SPARC Compliance Definition (SCD) Chapter 3
michael@0:     for more information about what is going on here, including
michael@0:     the use of BIAS (0x7ff).
michael@0:     The SCD is available from http://www.sparc.com/.
michael@0: */
michael@0: 
michael@0:         .global NS_InvokeByIndex
michael@0:         .type   NS_InvokeByIndex, #function
michael@0: 
michael@0: /*
michael@0:     NS_InvokeByIndex(nsISupports* that, uint32_t methodIndex,
michael@0:                      uint32_t paramCount, nsXPTCVariant* params);
michael@0:     
michael@0: */
michael@0: NS_InvokeByIndex:
michael@0:         save    %sp,-(128 + 64),%sp ! room for the register window and
michael@0:                                     ! struct pointer, rounded up to 0 % 64
michael@0:         sll     %i2,4,%l0           ! assume the worst case
michael@0:                                     ! paramCount * 2 * 8 bytes
michael@0:         cmp     %l0, 0              ! are there any args? If not,
michael@0:         be      .invoke             ! no need to copy args to stack
michael@0:         nop
michael@0: 
michael@0:         sub     %sp,%l0,%sp         ! create the additional stack space
michael@0:         add     %sp,0x7ff+136,%o0   ! step past the register window, the
michael@0:                                     ! struct result pointer and the 'this' slot
michael@0:         mov     %i2,%o1             ! paramCount
michael@0:         call    invoke_copy_to_stack
michael@0:         mov     %i3,%o2             ! params
michael@0: 
michael@0: !
michael@0: !   load arguments from stack into the outgoing registers
michael@0: !   BIAS is 0x7ff (2047)
michael@0: !
michael@0: 
michael@0: !   load the %o1..5 64bit (extended word) output registers registers 
michael@0:         ldx     [%sp + 0x7ff + 136],%o1    ! %i1
michael@0:         ldx     [%sp + 0x7ff + 144],%o2    ! %i2
michael@0:         ldx     [%sp + 0x7ff + 152],%o3    ! %i3
michael@0:         ldx     [%sp + 0x7ff + 160],%o4    ! %i4
michael@0:         ldx     [%sp + 0x7ff + 168],%o5    ! %i5
michael@0: 
michael@0: !   load the even number double registers starting with %f2
michael@0:         ldd     [%sp + 0x7ff + 136],%f2
michael@0:         ldd     [%sp + 0x7ff + 144],%f4
michael@0:         ldd     [%sp + 0x7ff + 152],%f6
michael@0:         ldd     [%sp + 0x7ff + 160],%f8
michael@0:         ldd     [%sp + 0x7ff + 168],%f10
michael@0:         ldd     [%sp + 0x7ff + 176],%f12
michael@0:         ldd     [%sp + 0x7ff + 184],%f14
michael@0:         ldd     [%sp + 0x7ff + 192],%f16
michael@0:         ldd     [%sp + 0x7ff + 200],%f18
michael@0:         ldd     [%sp + 0x7ff + 208],%f20
michael@0:         ldd     [%sp + 0x7ff + 216],%f22
michael@0:         ldd     [%sp + 0x7ff + 224],%f24
michael@0:         ldd     [%sp + 0x7ff + 232],%f26
michael@0:         ldd     [%sp + 0x7ff + 240],%f28
michael@0:         ldd     [%sp + 0x7ff + 248],%f30
michael@0: 
michael@0: !
michael@0: !   calculate the target address from the vtable
michael@0: !
michael@0: .invoke:
michael@0:         sll     %i1,3,%l0           ! index *= 8
michael@0: !       add     %l0,16,%l0          ! there are 2 extra entries in the vTable (16bytes)
michael@0:         ldx     [%i0],%l1           ! *that --> address of vtable
michael@0:         ldx     [%l0 + %l1],%l0     ! that->vtable[index * 8 + 16] --> address
michael@0: 
michael@0:         jmpl    %l0,%o7             ! call the routine
michael@0:         mov     %i0,%o0             ! move 'this' pointer to out register
michael@0: 
michael@0:         mov     %o0,%i0             ! propagate return value
michael@0:         ret
michael@0:         restore
michael@0: 
michael@0:         .size    NS_InvokeByIndex, .-NS_InvokeByIndex