diff options
Diffstat (limited to 'src/libs/xpcom18a4/xpcom/reflect/xptcall/src/md/unix/xptcinvoke_amd64_vbox.asm')
| -rw-r--r-- | src/libs/xpcom18a4/xpcom/reflect/xptcall/src/md/unix/xptcinvoke_amd64_vbox.asm | 403 |
1 files changed, 403 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/xpcom/reflect/xptcall/src/md/unix/xptcinvoke_amd64_vbox.asm b/src/libs/xpcom18a4/xpcom/reflect/xptcall/src/md/unix/xptcinvoke_amd64_vbox.asm new file mode 100644 index 00000000..aaeaf84a --- /dev/null +++ b/src/libs/xpcom18a4/xpcom/reflect/xptcall/src/md/unix/xptcinvoke_amd64_vbox.asm @@ -0,0 +1,403 @@ +; $Id: xptcinvoke_amd64_vbox.asm $ +;; @file +; XPCOM - Implementation XPTC_InvokeByIndex in assembly. +; +; This solves the problem of Clang and gcc (sometimes) not playing along with +; the alloca() based trick to pass stack parameters. We first had trouble +; when enabling asan with gcc 8.2, then Clang 11 on mac had similar issues +; (at least for profile builds). +; + +; +; Copyright (C) 2020-2023 Oracle and/or its affiliates. +; +; This file is part of VirtualBox base platform packages, as +; available from https://www.virtualbox.org. +; +; This program is free software; you can redistribute it and/or +; modify it under the terms of the GNU General Public License +; as published by the Free Software Foundation, in version 3 of the +; License. +; +; This program is distributed in the hope that it will be useful, but +; WITHOUT ANY WARRANTY; without even the implied warranty of +; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +; General Public License for more details. +; +; You should have received a copy of the GNU General Public License +; along with this program; if not, see <https://www.gnu.org/licenses>. +; +; SPDX-License-Identifier: GPL-3.0-only +; + + +;********************************************************************************************************************************* +;* Internal Functions * +;********************************************************************************************************************************* +%include "iprt/asmdefs.mac" + + +;********************************************************************************************************************************* +;* Structures and Typedefs * +;********************************************************************************************************************************* +struc nsXPTCVariant + .val resq 1 + .ptr resq 1 + .type resb 1 + .flags resb 1 + alignb 8 +endstruc + + +;********************************************************************************************************************************* +;* Defined Constants And Macros * +;********************************************************************************************************************************* +;; @name Selected nsXPTCVariant::flags values. +;; @{ +%define PTR_IS_DATA 1 +;; @} + +;; @name Selected nsXPTType (nsXPTCVariant::type) values. +;; @{ +%define T_FLOAT 8 +%define T_DOUBLE 9 +;; @} + +;; Error code we use if there are too many parameters. +%define DISP_E_BADPARAMCOUNT 0x8002000e + +;; Effect name mangling. +%ifdef VBOX_WITH_XPCOM_NAMESPACE_CLEANUP + %define XPTC_InvokeByIndex VBoxNsxpXPTC_InvokeByIndex +%endif + + +BEGINCODE + +;; +; +; @cproto nsresult XPTC_InvokeByIndex(nsISupports *pThat, PRUint32 idxMethod, PRUint32 cParams, nsXPTCVariant *paParams) +; +; @param pThat Pointer to the object we're invoking a method on. register:rdi +; @param idxMethod The VTable method index. register:esi +; @param cParams Number of parameters in addition to pThat. register:edx +; @param paParams Array of parameter values and info. register:rcx +; +BEGINPROC_EXPORTED XPTC_InvokeByIndex + push rbp + mov rbp, rsp + push rbx + push r12 + + ; + ; Move essential input parameters into non-parameter registers. + ; + mov rbx, rcx ; rbx = first / current parameter + mov r12d, edx ; r12 = parameter count / left + + ; Look up the method address in the vtable and store it in r11 (freeing up rsi). + mov r11, [rdi] ; r11 = vtable + mov esi, esi ; zero extend vtable index. + mov r11, [r11 + rsi * 8] ; r11 = method to call. + +%define WITH_OPTIMIZATION +%ifdef WITH_OPTIMIZATION + ; + ; If there are 5 or fewer parameters and they are all suitable for GREGs, + ; we can try optimize the processing here. + ; + ; Switch on count, using fall-thought-to-smaller-value logic, default + ; case goes to generic (slow) code path. + ; + dec edx ; we can still use edx for the parameter count here as a throwaway. + jz .fast_1 + dec edx + jz .fast_2 + dec edx + jz .fast_3 + dec edx + jz .fast_4 + dec edx + jnz .slow_or_zero +%macro fast_case 4 +%1: + mov eax, [rbx + nsXPTCVariant_size * %3 + nsXPTCVariant.type] ; ASSUMES 'type' and 'flags' are adjacent byte fields. + test ah, PTR_IS_DATA + mov %4, [rbx + nsXPTCVariant_size * %3 + nsXPTCVariant.ptr] + jnz %2 + sub al, T_FLOAT + sub al, 2 + jl .fast_bailout + mov %4, [rbx + nsXPTCVariant_size * %3 + nsXPTCVariant.val] +%endmacro + fast_case .fast_5, .fast_4, 4, r9 + fast_case .fast_4, .fast_3, 3, r8 + fast_case .fast_3, .fast_2, 2, rcx + fast_case .fast_2, .fast_1, 1, rdx + fast_case .fast_1, .fast_0, 0, rsi +.fast_0: + xor eax, eax + call r11 ; note! stack is aligned here. + +.fast_return: + lea rsp, [rbp - 8*2] + pop r12 + pop rbx + leave + ret + +.slow_or_zero: + cmp r12d, 0 + je .fast_0 + %if 0 + jmp .slow +.fast_bailout: + int3 + %else +.fast_bailout: + %endif +.slow: +%endif + ; One more push. + push r13 + + ; + ; Check that there aren't unreasonably many parameters + ; (we could do ~255, but 64 is more reasonable number). + ; + cmp r12d, 64 + je .too_many_parameters + + ; + ; For simplicity reserve stack space for all parameters and point r10 at it. + ; + lea edx, [r12d * 8] + sub rsp, rdx + and rsp, byte 0ffffffffffffffe0h ; 32 byte aligned stack. + mov r10, rsp ; r10 = next stack parameter. + + ; + ; Set up parameter pointer and register distribution counts. + ; + mov eax, 1 ; al = greg count, ah = fpreg count. + + ; + ; Anything to do here? + ; +%ifndef WITH_OPTIMIZATION + test r12d,r12d + jz .make_call +%endif + jmp .param_loop + + ; + ; The loop. + ; + ALIGNCODE(64) +.param_loop_advance: + add rbx, nsXPTCVariant_size +.param_loop: + ; First test for pointers using 'flags' then work 'type' for the rest. + test byte [rbx + nsXPTCVariant.flags], PTR_IS_DATA + jnz .is_ptr + cmp byte [rbx + nsXPTCVariant.type], T_FLOAT + jge .maybe_in_fpreg + + ; + ; nsXPTCVariant.val belongs in a GREG or on the stack. + ; Note! Hope we can get away with not zero extending the value here. + ; +.in_greg: + inc al + cmp al, 1+1 + je .in_greg_rsi + cmp al, 2+1 + je .in_greg_rdx + cmp al, 3+1 + je .in_greg_rcx + cmp al, 4+1 + je .in_greg_r8 + cmp al, 5+1 + ja .on_stack +.in_greg_r9: + mov r9, [rbx + nsXPTCVariant.val] + jmp .next +.in_greg_r8: + mov r8, [rbx + nsXPTCVariant.val] + jmp .next +.in_greg_rcx: + mov rcx, [rbx + nsXPTCVariant.val] + jmp .next +.in_greg_rdx: + mov rdx, [rbx + nsXPTCVariant.val] + jmp .next +.in_greg_rsi: + mov rsi, [rbx + nsXPTCVariant.val] + jmp .next + + ; + ; Pointers are loaded from the 'ptr' rather than the 'val' member. + ; + ALIGNCODE(64) +.is_ptr: + inc al + cmp al, 1+1 + je .ptr_in_greg_rsi + cmp al, 2+1 + je .ptr_in_greg_rdx + cmp al, 3+1 + je .ptr_in_greg_rcx + cmp al, 4+1 + je .ptr_in_greg_r8 + cmp al, 5+1 + je .ptr_in_greg_r9 + mov r13, [rbx + nsXPTCVariant.ptr] + jmp .r13_on_stack + +.ptr_in_greg_r9: + mov r9, [rbx + nsXPTCVariant.ptr] + jmp .next +.ptr_in_greg_r8: + mov r8, [rbx + nsXPTCVariant.ptr] + jmp .next +.ptr_in_greg_rcx: + mov rcx, [rbx + nsXPTCVariant.ptr] + jmp .next +.ptr_in_greg_rdx: + mov rdx, [rbx + nsXPTCVariant.ptr] + jmp .next +.ptr_in_greg_rsi: + mov rsi, [rbx + nsXPTCVariant.ptr] + jmp .next + + ; + ; Maybe we've got a float or double type here... + ; +.maybe_in_fpreg: + je .float_in_fpreg + cmp byte [rbx + nsXPTCVariant.type], T_DOUBLE + jne .in_greg + +.double_in_fpreg: + cmp ah, 8 ; Ensure max AL value of 8 when making call. + jge .on_stack + inc ah + cmp ah, 0+1 + je .double_in_xmm0 + cmp ah, 1+1 + je .double_in_xmm1 + cmp ah, 2+1 + je .double_in_xmm2 + cmp ah, 3+1 + je .double_in_xmm3 + cmp ah, 4+1 + je .double_in_xmm4 + cmp ah, 5+1 + je .double_in_xmm5 + cmp ah, 6+1 + je .double_in_xmm6 +.double_in_xmm7: + movsd xmm7, [rbx + nsXPTCVariant.val] + jmp .next +.double_in_xmm6: + movsd xmm6, [rbx + nsXPTCVariant.val] + jmp .next +.double_in_xmm5: + movsd xmm5, [rbx + nsXPTCVariant.val] + jmp .next +.double_in_xmm4: + movsd xmm4, [rbx + nsXPTCVariant.val] + jmp .next +.double_in_xmm3: + movsd xmm3, [rbx + nsXPTCVariant.val] + jmp .next +.double_in_xmm2: + movsd xmm2, [rbx + nsXPTCVariant.val] + jmp .next +.double_in_xmm1: + movsd xmm1, [rbx + nsXPTCVariant.val] + jmp .next +.double_in_xmm0: + movsd xmm0, [rbx + nsXPTCVariant.val] + jmp .next + +.float_in_fpreg: + cmp ah, 8 ; Ensure max AL value of 8 when making call. + jge .on_stack + inc ah + cmp ah, 0+1 + je .float_in_xmm0 + cmp ah, 1+1 + je .float_in_xmm1 + cmp ah, 2+1 + je .float_in_xmm2 + cmp ah, 3+1 + je .float_in_xmm3 + cmp ah, 4+1 + je .float_in_xmm4 + cmp ah, 5+1 + je .float_in_xmm5 + cmp ah, 6+1 + je .float_in_xmm6 +.float_in_xmm7: + movss xmm7, [rbx + nsXPTCVariant.val] + jmp .next +.float_in_xmm6: + movss xmm6, [rbx + nsXPTCVariant.val] + jmp .next +.float_in_xmm5: + movss xmm5, [rbx + nsXPTCVariant.val] + jmp .next +.float_in_xmm4: + movss xmm4, [rbx + nsXPTCVariant.val] + jmp .next +.float_in_xmm3: + movss xmm3, [rbx + nsXPTCVariant.val] + jmp .next +.float_in_xmm2: + movss xmm2, [rbx + nsXPTCVariant.val] + jmp .next +.float_in_xmm1: + movss xmm1, [rbx + nsXPTCVariant.val] + jmp .next +.float_in_xmm0: + movss xmm0, [rbx + nsXPTCVariant.val] + jmp .next + + ; + ; Put the value onto the stack via r13. + ; + ALIGNCODE(64) +.on_stack: + mov r13, [rbx + nsXPTCVariant.val] +.r13_on_stack: + mov [r10], r13 + lea r10, [r10 + 8] + + ; + ; Update parameter pointer and count and maybe loop again. + ; +.next: + dec r12d + jnz .param_loop_advance + + ; + ; Call the method and return. + ; +.make_call: + movzx eax, ah ; AL = number of parameters in XMM registers (variadict only, but easy to do). +.make_just_call: + call r11 + +.return: + lea rsp, [rbp - 8*3] + pop r13 + pop r12 + pop rbx + leave + ret + +.too_many_parameters: + mov eax, DISP_E_BADPARAMCOUNT + jmp .return +ENDPROC XPTC_InvokeByIndex |