diff options
Diffstat (limited to 'xpcom/reflect/xptcall/md/unix/xptcinvoke_asm_x86_64_unix.S')
-rw-r--r-- | xpcom/reflect/xptcall/md/unix/xptcinvoke_asm_x86_64_unix.S | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/xpcom/reflect/xptcall/md/unix/xptcinvoke_asm_x86_64_unix.S b/xpcom/reflect/xptcall/md/unix/xptcinvoke_asm_x86_64_unix.S new file mode 100644 index 0000000000..0cb7ff37c7 --- /dev/null +++ b/xpcom/reflect/xptcall/md/unix/xptcinvoke_asm_x86_64_unix.S @@ -0,0 +1,117 @@ +# This Source Code Form is subject to the terms of the Mozilla Public +# License, v. 2.0. If a copy of the MPL was not distributed with this +# file, You can obtain one at http://mozilla.org/MPL/2.0/. + +# Darwin gives a leading '_' to symbols defined in C code. +#ifdef XP_DARWIN +#define SYM(x) _ ## x +#else +#define SYM(x) x +#endif + +#define CFI_STARTPROC .cfi_startproc +#define CFI_ENDPROC .cfi_endproc +#define CFI_DEF_CFA_OFFSET(offset) .cfi_def_cfa_offset offset +#define CFI_OFFSET(reg, offset) .cfi_offset reg, offset +#define CFI_DEF_CFA_REGISTER(reg) .cfi_def_cfa_register reg +#define CFI_DEF_CFA(reg, offset) .cfi_def_cfa reg, offset + +.intel_syntax noprefix + +# nsresult NS_InvokeByIndex(nsISupports* this, uint32_t aVtableIndex, +# uint32_t argc, nsXPTCVariant* argv); +.text +.global SYM(NS_InvokeByIndex) +#ifndef XP_DARWIN +.type NS_InvokeByIndex, @function +#endif +.align 4 +SYM(NS_InvokeByIndex): + CFI_STARTPROC + push rbp + CFI_DEF_CFA_OFFSET(16) + CFI_OFFSET(6, -16) + mov rbp, rsp + CFI_DEF_CFA_REGISTER(6) + +# save r12 and r13 because we use them and they are callee saved. + push r12 + push r13 + CFI_OFFSET(12, -24) + CFI_OFFSET(13, -32) + +# save this and the vtable index because we need them after setting up the +# stack. + mov r12, rdi + mov r13, rsi + +# allocate space for stack arguments, in theory we only need 8 * (argc - 5) +# bytes because at least 5 arguments will go in registers, but for now it is +# just simpler to allocate 8 * argc bytes. Note that we treat the this +# pointer specially. + lea eax, [edx * 8] + sub rsp, rax + +# If there is an odd number of args the stack can be misaligned so realign it. + and rsp, 0xfffffffffffffff0 + +# pass the stack slot area to InvokeCopyToStack. + mov r8, rsp + +# setup space for the register slots: there are 5 integer ones and 8 floating +# point ones. So we need 104 bytes of space, but we allocate 112 to keep rsp +# aligned to 16 bytes. + sub rsp, 112 + +# the first argument to InvokeCopyToStack is the integer register area, and the +# second is the floating point area. + mov rdi, rsp + lea rsi, [rsp + 40] + +# The 3rd and 4th arguments to InvokeCopyToStack are already in the right +# registers. So now we can just call InvokeCopyToStack. + call SYM(InvokeCopyToStack) + +# setup this + mov rdi, r12 + +# copy the integer arguments into place. + mov rsi, [rsp] + mov rdx, [rsp + 8] + mov rcx, [rsp + 16] + mov r8, [rsp + 24] + mov r9, [rsp + 32] + +# copy the float arguments into place + movsd xmm0, [rsp + 40] + movsd xmm1, [rsp + 48] + movsd xmm2, [rsp + 56] + movsd xmm3, [rsp + 64] + movsd xmm4, [rsp + 72] + movsd xmm5, [rsp + 80] + movsd xmm6, [rsp + 88] + movsd xmm7, [rsp + 96] + +# get rid of the scratch space for registers + add rsp, 112 + +# load the function pointer and call + lea eax, [r13d * 8] + add rax, [rdi] + call [rax] + +# r12 and r13 were pushed relative to the old stack pointer which is now the +# frame pointer. + mov r12, [rbp - 0x8] + mov r13, [rbp - 0x10] + + mov rsp, rbp + pop rbp + CFI_DEF_CFA(7, 8) + ret + CFI_ENDPROC + +#ifndef XP_DARWIN +// Magic indicating no need for an executable stack +.section .note.GNU-stack, "", @progbits +#endif |