| // Copyright 2019 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. | |
| // +build libfuzzer | |
| #include "go_asm.h" | |
| #include "textflag.h" | |
| // Based on race_arm64.s; see commentary there. | |
| // func runtime·libfuzzerCall(fn, arg0, arg1 uintptr) | |
| // Calls C function fn from libFuzzer and passes 2 arguments to it. | |
| TEXT runtime·libfuzzerCall(SB), NOSPLIT, $0-24 | |
| MOVD fn+0(FP), R9 | |
| MOVD arg0+8(FP), R0 | |
| MOVD arg1+16(FP), R1 | |
| MOVD g_m(g), R10 | |
| // Switch to g0 stack. | |
| MOVD RSP, R19 // callee-saved, preserved across the CALL | |
| MOVD m_g0(R10), R11 | |
| CMP R11, g | |
| BEQ call // already on g0 | |
| MOVD (g_sched+gobuf_sp)(R11), R12 | |
| MOVD R12, RSP | |
| call: | |
| BL R9 | |
| MOVD R19, RSP | |
| RET |