1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/xpcom/reflect/xptcall/src/md/win32/xptcinvoke_asm_x86_64.asm Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,107 @@
1.4 +; This Source Code Form is subject to the terms of the Mozilla Public
1.5 +; License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 +; file, You can obtain one at http://mozilla.org/MPL/2.0/.
1.7 +
1.8 +extrn invoke_copy_to_stack:PROC
1.9 +
1.10 +
1.11 +.CODE
1.12 +
1.13 +;
1.14 +;XPTC__InvokebyIndex(nsISupports* that, uint32_t methodIndex,
1.15 +; uint32_t paramCount, nsXPTCVariant* params)
1.16 +;
1.17 +
1.18 +XPTC__InvokebyIndex PROC FRAME
1.19 +
1.20 + ; store register parameters
1.21 +
1.22 + mov qword ptr [rsp+32], r9 ; params
1.23 + mov dword ptr [rsp+24], r8d ; paramCount
1.24 + mov dword ptr [rsp+16], edx ; methodIndex
1.25 + mov qword ptr [rsp+8], rcx ; that
1.26 +
1.27 + push rbp
1.28 + .PUSHREG rbp
1.29 + mov rbp, rsp ; store current RSP to RBP
1.30 + .SETFRAME rbp, 0
1.31 + .ENDPROLOG
1.32 +
1.33 + sub rsp, 32
1.34 +
1.35 + ; maybe we don't have any parameters to copy
1.36 +
1.37 + test r8d, r8d
1.38 + jz noparams
1.39 +
1.40 + ;
1.41 + ; Build stack for stdcall
1.42 + ;
1.43 +
1.44 + ; 1st parameter is space for parameters
1.45 +
1.46 + mov eax, r8d
1.47 + or eax, 1
1.48 + shl rax, 3 ; *= 8
1.49 + sub rsp, rax
1.50 + mov rcx, rsp
1.51 +
1.52 + ; 2nd parameter is parameter count
1.53 +
1.54 + mov edx, r8d
1.55 +
1.56 + ; 3rd parameter is params
1.57 +
1.58 + mov r8, r9
1.59 +
1.60 + sub rsp, 40
1.61 + call invoke_copy_to_stack ; rcx = d
1.62 + ; edx = paramCount
1.63 + ; r8 = s
1.64 + add rsp, 32
1.65 +
1.66 + ; Current stack is the following.
1.67 + ;
1.68 + ; 0h: [space (for this)]
1.69 + ; 8h: [1st parameter]
1.70 + ; 10h: [2nd parameter]
1.71 + ; 18h: [3rd parameter]
1.72 + ; 20h: [4th parameter]
1.73 + ; ...
1.74 + ;
1.75 + ; On Win64 ABI, the first 4 parameters are passed using registers,
1.76 + ; and others are on stack.
1.77 +
1.78 + ; 1st, 2nd and 3rd arguments are passed via registers
1.79 +
1.80 + mov rdx, qword ptr [rsp+8] ; 1st parameter
1.81 + movsd xmm1, qword ptr [rsp+8] ; for double
1.82 +
1.83 + mov r8, qword ptr [rsp+16] ; 2nd parameter
1.84 + movsd xmm2, qword ptr [rsp+16] ; for double
1.85 +
1.86 + mov r9, qword ptr [rsp+24] ; 3rd parameter
1.87 + movsd xmm3, qword ptr [rsp+24] ; for double
1.88 +
1.89 + ; rcx register is this
1.90 +
1.91 + mov rcx, qword ptr [rbp+8+8] ; that
1.92 +
1.93 +noparams:
1.94 +
1.95 + ; calculate call address
1.96 +
1.97 + mov r11, qword ptr [rcx]
1.98 + mov eax, dword ptr [rbp+16+8] ; methodIndex
1.99 +
1.100 + call qword ptr [r11+rax*8] ; stdcall, i.e. callee cleans up stack.
1.101 +
1.102 + mov rsp, rbp
1.103 + pop rbp
1.104 +
1.105 + ret
1.106 +
1.107 +XPTC__InvokebyIndex ENDP
1.108 +
1.109 +
1.110 +END
