1// SPDX-License-Identifier: Apache-2.0
2// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
3
4//go:build freebsd || linux
5
6package cgo
7
8// this file is placed inside internal/cgo and not package purego
9// because Cgo and assembly files can't be in the same package.
10
11/*
12 #cgo LDFLAGS: -ldl
13
14#include <stdint.h>
15#include <dlfcn.h>
16#include <errno.h>
17#include <assert.h>
18
19typedef struct syscall9Args {
20 uintptr_t fn;
21 uintptr_t a1, a2, a3, a4, a5, a6, a7, a8, a9;
22 uintptr_t f1, f2, f3, f4, f5, f6, f7, f8;
23 uintptr_t r1, r2, err;
24} syscall9Args;
25
26void syscall9(struct syscall9Args *args) {
27 assert((args->f1|args->f2|args->f3|args->f4|args->f5|args->f6|args->f7|args->f8) == 0);
28 uintptr_t (*func_name)(uintptr_t a1, uintptr_t a2, uintptr_t a3, uintptr_t a4, uintptr_t a5, uintptr_t a6, uintptr_t a7, uintptr_t a8, uintptr_t a9);
29 *(void**)(&func_name) = (void*)(args->fn);
30 uintptr_t r1 = func_name(args->a1,args->a2,args->a3,args->a4,args->a5,args->a6,args->a7,args->a8,args->a9);
31 args->r1 = r1;
32 args->err = errno;
33}
34
35*/
36import "C"
37import "unsafe"
38
39// assign purego.syscall9XABI0 to the C version of this function.
40var Syscall9XABI0 = unsafe.Pointer(C.syscall9)
41
42// all that is needed is to assign each dl function because then its
43// symbol will then be made available to the linker and linked to inside dlfcn.go
44var (
45 _ = C.dlopen
46 _ = C.dlsym
47 _ = C.dlerror
48 _ = C.dlclose
49)
50
51//go:nosplit
52func Syscall9X(fn, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2, err uintptr) {
53 args := C.syscall9Args{C.uintptr_t(fn), C.uintptr_t(a1), C.uintptr_t(a2), C.uintptr_t(a3),
54 C.uintptr_t(a4), C.uintptr_t(a5), C.uintptr_t(a6),
55 C.uintptr_t(a7), C.uintptr_t(a8), C.uintptr_t(a9), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
56 C.syscall9(&args)
57 return uintptr(args.r1), uintptr(args.r2), uintptr(args.err)
58}