subsonic-tui/vendor/github.com/ebitengine/purego/sys_amd64.s

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// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
//go:build darwin || freebsd || (!cgo && linux)
#include "textflag.h"
#include "abi_amd64.h"
#include "go_asm.h"
#include "funcdata.h"
// syscall9X calls a function in libc on behalf of the syscall package.
// syscall9X takes a pointer to a struct like:
// struct {
// fn uintptr
// a1 uintptr
// a2 uintptr
// a3 uintptr
// a4 uintptr
// a5 uintptr
// a6 uintptr
// a7 uintptr
// a8 uintptr
// a9 uintptr
// r1 uintptr
// r2 uintptr
// err uintptr
// }
// syscall9X must be called on the g0 stack with the
// C calling convention (use libcCall).
GLOBL ·syscall9XABI0(SB), NOPTR|RODATA, $8
DATA ·syscall9XABI0(SB)/8, $syscall9X(SB)
TEXT syscall9X(SB), NOSPLIT|NOFRAME, $0
PUSHQ BP
MOVQ SP, BP
SUBQ $32, SP
MOVQ DI, 24(BP) // save the pointer
MOVQ syscall9Args_f1(DI), X0 // f1
MOVQ syscall9Args_f2(DI), X1 // f2
MOVQ syscall9Args_f3(DI), X2 // f3
MOVQ syscall9Args_f4(DI), X3 // f4
MOVQ syscall9Args_f5(DI), X4 // f5
MOVQ syscall9Args_f6(DI), X5 // f6
MOVQ syscall9Args_f7(DI), X6 // f7
MOVQ syscall9Args_f8(DI), X7 // f8
MOVQ syscall9Args_fn(DI), R10 // fn
MOVQ syscall9Args_a2(DI), SI // a2
MOVQ syscall9Args_a3(DI), DX // a3
MOVQ syscall9Args_a4(DI), CX // a4
MOVQ syscall9Args_a5(DI), R8 // a5
MOVQ syscall9Args_a6(DI), R9 // a6
MOVQ syscall9Args_a7(DI), R11 // a7
MOVQ syscall9Args_a8(DI), R12 // a8
MOVQ syscall9Args_a9(DI), R13 // a9
MOVQ syscall9Args_a1(DI), DI // a1
// push the remaining paramters onto the stack
MOVQ R11, 0(SP) // push a7
MOVQ R12, 8(SP) // push a8
MOVQ R13, 16(SP) // push a9
XORL AX, AX // vararg: say "no float args"
CALL R10
MOVQ 24(BP), DI // get the pointer back
MOVQ AX, syscall9Args_r1(DI) // r1
MOVQ X0, syscall9Args_r2(DI) // r2
XORL AX, AX // no error (it's ignored anyway)
ADDQ $32, SP
MOVQ BP, SP
POPQ BP
RET
TEXT callbackasm1(SB), NOSPLIT|NOFRAME, $0
// remove return address from stack, we are not returning to callbackasm, but to its caller.
MOVQ 0(SP), AX
ADDQ $8, SP
MOVQ 0(SP), R10 // get the return SP so that we can align register args with stack args
// make space for first six int and 8 float arguments below the frame
ADJSP $14*8, SP
MOVSD X0, (1*8)(SP)
MOVSD X1, (2*8)(SP)
MOVSD X2, (3*8)(SP)
MOVSD X3, (4*8)(SP)
MOVSD X4, (5*8)(SP)
MOVSD X5, (6*8)(SP)
MOVSD X6, (7*8)(SP)
MOVSD X7, (8*8)(SP)
MOVQ DI, (9*8)(SP)
MOVQ SI, (10*8)(SP)
MOVQ DX, (11*8)(SP)
MOVQ CX, (12*8)(SP)
MOVQ R8, (13*8)(SP)
MOVQ R9, (14*8)(SP)
LEAQ 8(SP), R8 // R8 = address of args vector
MOVQ R10, 0(SP) // push the stack pointer below registers
// determine index into runtime·cbs table
MOVQ $callbackasm(SB), DX
SUBQ DX, AX
MOVQ $0, DX
MOVQ $5, CX // divide by 5 because each call instruction in ·callbacks is 5 bytes long
DIVL CX
SUBQ $1, AX // subtract 1 because return PC is to the next slot
// Switch from the host ABI to the Go ABI.
PUSH_REGS_HOST_TO_ABI0()
// Create a struct callbackArgs on our stack to be passed as
// the "frame" to cgocallback and on to callbackWrap.
// $24 to make enough room for the arguments to runtime.cgocallback
SUBQ $(24+callbackArgs__size), SP
MOVQ AX, (24+callbackArgs_index)(SP) // callback index
MOVQ R8, (24+callbackArgs_args)(SP) // address of args vector
MOVQ $0, (24+callbackArgs_result)(SP) // result
LEAQ 24(SP), AX // take the address of callbackArgs
// Call cgocallback, which will call callbackWrap(frame).
MOVQ ·callbackWrap_call(SB), DI // Get the ABIInternal function pointer
MOVQ (DI), DI // without <ABIInternal> by using a closure.
MOVQ AX, SI // frame (address of callbackArgs)
MOVQ $0, CX // context
CALL crosscall2(SB) // runtime.cgocallback(fn, frame, ctxt uintptr)
// Get callback result.
MOVQ (24+callbackArgs_result)(SP), AX
ADDQ $(24+callbackArgs__size), SP // remove callbackArgs struct
POP_REGS_HOST_TO_ABI0()
MOVQ 0(SP), R10 // get the SP back
ADJSP $-14*8, SP // remove arguments
MOVQ R10, 0(SP)
RET