1 // Copyright 2016 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4
5 //go:build mips64 || mips64le
6
7 #include "textflag.h"
8
9 // Set the x_crosscall2_ptr C function pointer variable point to crosscall2.
10 // It's such a pointer chain: _crosscall2_ptr -> x_crosscall2_ptr -> crosscall2
11 // Use a local trampoline, to avoid taking the address of a dynamically exported
12 // function.
13 TEXT ·set_crosscall2(SB),NOSPLIT,$0-0
14 MOVV _crosscall2_ptr(SB), R5
15 MOVV $crosscall2_trampoline<>(SB), R6
16 MOVV R6, (R5)
17 RET
18
19 TEXT crosscall2_trampoline<>(SB),NOSPLIT,$0-0
20 JMP crosscall2(SB)
21
22 // Called by C code generated by cmd/cgo.
23 // func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr)
24 // Saves C callee-saved registers and calls cgocallback with three arguments.
25 // fn is the PC of a func(a unsafe.Pointer) function.
26 TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0
27 /*
28 * We still need to save all callee save register as before, and then
29 * push 3 args for fn (R4, R5, R7), skipping R6.
30 * Also note that at procedure entry in gc world, 8(R29) will be the
31 * first arg.
32 */
33 #ifndef GOMIPS64_softfloat
34 ADDV $(-8*23), R29
35 #else
36 ADDV $(-8*15), R29
37 #endif
38 MOVV R4, (8*1)(R29) // fn unsafe.Pointer
39 MOVV R5, (8*2)(R29) // a unsafe.Pointer
40 MOVV R7, (8*3)(R29) // ctxt uintptr
41 MOVV R16, (8*4)(R29)
42 MOVV R17, (8*5)(R29)
43 MOVV R18, (8*6)(R29)
44 MOVV R19, (8*7)(R29)
45 MOVV R20, (8*8)(R29)
46 MOVV R21, (8*9)(R29)
47 MOVV R22, (8*10)(R29)
48 MOVV R23, (8*11)(R29)
49 MOVV RSB, (8*12)(R29)
50 MOVV g, (8*13)(R29)
51 MOVV R31, (8*14)(R29)
52 #ifndef GOMIPS64_softfloat
53 MOVD F24, (8*15)(R29)
54 MOVD F25, (8*16)(R29)
55 MOVD F26, (8*17)(R29)
56 MOVD F27, (8*18)(R29)
57 MOVD F28, (8*19)(R29)
58 MOVD F29, (8*20)(R29)
59 MOVD F30, (8*21)(R29)
60 MOVD F31, (8*22)(R29)
61 #endif
62 // Initialize Go ABI environment
63 // prepare SB register = PC & 0xffffffff00000000
64 BGEZAL R0, 1(PC)
65 SRLV $32, R31, RSB
66 SLLV $32, RSB
67 JAL runtime·load_g(SB)
68
69 JAL runtime·cgocallback(SB)
70
71 MOVV (8*4)(R29), R16
72 MOVV (8*5)(R29), R17
73 MOVV (8*6)(R29), R18
74 MOVV (8*7)(R29), R19
75 MOVV (8*8)(R29), R20
76 MOVV (8*9)(R29), R21
77 MOVV (8*10)(R29), R22
78 MOVV (8*11)(R29), R23
79 MOVV (8*12)(R29), RSB
80 MOVV (8*13)(R29), g
81 MOVV (8*14)(R29), R31
82 #ifndef GOMIPS64_softfloat
83 MOVD (8*15)(R29), F24
84 MOVD (8*16)(R29), F25
85 MOVD (8*17)(R29), F26
86 MOVD (8*18)(R29), F27
87 MOVD (8*19)(R29), F28
88 MOVD (8*20)(R29), F29
89 MOVD (8*21)(R29), F30
90 MOVD (8*22)(R29), F31
91 ADDV $(8*23), R29
92 #else
93 ADDV $(8*15), R29
94 #endif
95 RET
96
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