| // Copyright 2016 The Go Authors. All rights reserved. | |
| // Use of this source code is governed by a BSD-style | |
| // license that can be found in the LICENSE file. | |
| //go:build mips || mipsle | |
| #include "textflag.h" | |
| // Set the x_crosscall2_ptr C function pointer variable point to crosscall2. | |
| // It's such a pointer chain: _crosscall2_ptr -> x_crosscall2_ptr -> crosscall2 | |
| // Use a local trampoline, to avoid taking the address of a dynamically exported | |
| // function. | |
| TEXT ·set_crosscall2(SB),NOSPLIT,$0-0 | |
| MOVW _crosscall2_ptr(SB), R5 | |
| MOVW $crosscall2_trampoline<>(SB), R6 | |
| MOVW R6, (R5) | |
| RET | |
| TEXT crosscall2_trampoline<>(SB),NOSPLIT,$0-0 | |
| JMP crosscall2(SB) | |
| // Called by C code generated by cmd/cgo. | |
| // func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr) | |
| // Saves C callee-saved registers and calls cgocallback with three arguments. | |
| // fn is the PC of a func(a unsafe.Pointer) function. | |
| TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0 | |
| /* | |
| * We still need to save all callee save register as before, and then | |
| * push 3 args for fn (R4, R5, R7), skipping R6. | |
| * Also note that at procedure entry in gc world, 4(R29) will be the | |
| * first arg. | |
| */ | |
| // Space for 9 caller-saved GPR + LR + 6 caller-saved FPR. | |
| // O32 ABI allows us to smash 16 bytes argument area of caller frame. | |
| #ifndef GOMIPS_softfloat | |
| SUBU $(4*14+8*6-16), R29 | |
| #else | |
| SUBU $(4*14-16), R29 // For soft-float, no FPR. | |
| #endif | |
| MOVW R4, (4*1)(R29) // fn unsafe.Pointer | |
| MOVW R5, (4*2)(R29) // a unsafe.Pointer | |
| MOVW R7, (4*3)(R29) // ctxt uintptr | |
| MOVW R16, (4*4)(R29) | |
| MOVW R17, (4*5)(R29) | |
| MOVW R18, (4*6)(R29) | |
| MOVW R19, (4*7)(R29) | |
| MOVW R20, (4*8)(R29) | |
| MOVW R21, (4*9)(R29) | |
| MOVW R22, (4*10)(R29) | |
| MOVW R23, (4*11)(R29) | |
| MOVW g, (4*12)(R29) | |
| MOVW R31, (4*13)(R29) | |
| #ifndef GOMIPS_softfloat | |
| MOVD F20, (4*14)(R29) | |
| MOVD F22, (4*14+8*1)(R29) | |
| MOVD F24, (4*14+8*2)(R29) | |
| MOVD F26, (4*14+8*3)(R29) | |
| MOVD F28, (4*14+8*4)(R29) | |
| MOVD F30, (4*14+8*5)(R29) | |
| #endif | |
| JAL runtime·load_g(SB) | |
| JAL runtime·cgocallback(SB) | |
| MOVW (4*4)(R29), R16 | |
| MOVW (4*5)(R29), R17 | |
| MOVW (4*6)(R29), R18 | |
| MOVW (4*7)(R29), R19 | |
| MOVW (4*8)(R29), R20 | |
| MOVW (4*9)(R29), R21 | |
| MOVW (4*10)(R29), R22 | |
| MOVW (4*11)(R29), R23 | |
| MOVW (4*12)(R29), g | |
| MOVW (4*13)(R29), R31 | |
| #ifndef GOMIPS_softfloat | |
| MOVD (4*14)(R29), F20 | |
| MOVD (4*14+8*1)(R29), F22 | |
| MOVD (4*14+8*2)(R29), F24 | |
| MOVD (4*14+8*3)(R29), F26 | |
| MOVD (4*14+8*4)(R29), F28 | |
| MOVD (4*14+8*5)(R29), F30 | |
| ADDU $(4*14+8*6-16), R29 | |
| #else | |
| ADDU $(4*14-16), R29 | |
| #endif | |
| RET |