Magic-Mirror/gecko-dev
1
0
Fork 0
mirror of https://github.com/mozilla/gecko-dev.git synced 2024-11-30 00:01:50 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Bug 627335 - Port patch from bug 567707 to GCC assembly r=timeless a=NPOTB

Browse Source
This commit is contained in:
Jacek Caban 2011-01-30 21:20:23 +00:00
parent 3513af4a7a
commit 226dc8b1f5
1 changed files with 32 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

80
xpcom/reflect/xptcall/src/md/win32/xptcinvoke_asm_x86_64_gnu.s
View File

@ -52,106 +52,90 @@
.endef
XPTC__InvokebyIndex:
#
# store register parameters
#
mov qword ptr [rsp+32], r9 # params
mov dword ptr [rsp+24], r8d # paramCount
mov dword ptr [rsp+16], edx # methodIndex
mov qword ptr [rsp+8], rcx # that
#
# store RBX/RBP register for backup
#
mov qword ptr [rsp-16], rbp
push rbp
# .PUSHREG rbp
mov rbp, rsp # store current RSP to RBP
# .SETFRAME rbp, 0
# .ENDPROLOG
sub rsp, 32
#
# maybe we don't have any parameters to copy
#
test r8d, r8d
jz noparams
#
# make space for 1st parameter
# Build stack for stdcall
#
# 1st parameter is space for parameters
mov eax, r8d
and eax, 1 # AMD64 must be alignment to 16 bytes
add eax, r8d
or eax, 1
shl rax, 3 # *= 8
sub rsp, rax
mov rcx, rsp
#
# 2nd parameter is parameter count
#
mov edx, r8d
#
# 3rd parameter is params
#
mov r8, r9
sub rsp, 32
call invoke_copy_to_stack # rcx = d
# edx = paramCount
# r8 = s
sub rsp, 40
call invoke_copy_to_stack # rcx = d
# edx = paramCount
# r8 = s
add rsp, 32
# Current stack is the following.
#
# Build parameters
# 0h: [space (for this)]
# 8h: [1st parameter]
# 10h: [2nd parameter]
# 18h: [3rd parameter]
# 20h: [4th parameter]
# ...
#
# On Win64 ABI, the first 4 parameters are passed using registers,
# and others are on stack.
mov rdx, qword ptr [rsp] # 1st parameter
movsd xmm1, qword ptr [rsp] # for double
# 1st, 2nd and 3rd arguments are passed via registers
mov r8, qword ptr [rsp+8] # 2nd parameter
movsd xmm2, qword ptr [rsp+8] # for double
mov rdx, qword ptr [rsp+8] # 1st parameter
movsd xmm1, qword ptr [rsp+8] # for double
mov r9, qword ptr [rsp+16] # 3rd parameter
movsd xmm3, qword ptr [rsp+16] # for double
mov r8, qword ptr [rsp+16] # 2nd parameter
movsd xmm2, qword ptr [rsp+16] # for double
#
# 1st parameter (this)
#
mov r9, qword ptr [rsp+24] # 3rd parameter
movsd xmm3, qword ptr [rsp+24] # for double
mov rcx, qword ptr [rbp+8] # that
# rcx register is this
mov rcx, qword ptr [rbp+8+8] # that
noparams:
#
# calculate call address
#
mov r11, qword ptr [rcx]
mov eax, dword ptr [rbp+16] # methodIndex
#
# Now current stack has parameter list
# But, since callee function backups parameters, make space into stack.
sub rsp, 8
mov eax, dword ptr [rbp+16+8] # methodIndex
call qword ptr [r11+rax*8] # stdcall, i.e. callee cleans up stack.
#
# restore registers
#
mov rsp, rbp
mov rbp, qword ptr [rsp-16]
pop rbp
ret