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Diffstat (limited to 'src/runtime/libfuzzer_amd64.s')
| -rw-r--r-- | src/runtime/libfuzzer_amd64.s | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/runtime/libfuzzer_amd64.s b/src/runtime/libfuzzer_amd64.s new file mode 100644 index 0000000..890fde3 --- /dev/null +++ b/src/runtime/libfuzzer_amd64.s @@ -0,0 +1,42 @@ +// 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 |