| // 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 "go_tls.h" |
| #include "textflag.h" |
| |
| // Based on race_amd64.s; see commentary there. |
| |
| #ifdef GOOS_windows |
| #define RARG0 CX |
| #define RARG1 DX |
| #else |
| #define RARG0 DI |
| #define RARG1 SI |
| #endif |
| |
| // void 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 |
| MOVQ fn+0(FP), AX |
| MOVQ arg0+8(FP), RARG0 |
| MOVQ arg1+16(FP), RARG1 |
| |
| get_tls(R12) |
| MOVQ g(R12), R14 |
| MOVQ g_m(R14), R13 |
| |
| // Switch to g0 stack. |
| MOVQ SP, R12 // callee-saved, preserved across the CALL |
| MOVQ m_g0(R13), R10 |
| CMPQ R10, R14 |
| JE call // already on g0 |
| MOVQ (g_sched+gobuf_sp)(R10), SP |
| call: |
| ANDQ $~15, SP // alignment for gcc ABI |
| CALL AX |
| MOVQ R12, SP |
| RET |
