From 357a013060686aa90432dba93faa01196452eabe Mon Sep 17 00:00:00 2001 From: Ian Lance Taylor Date: Mon, 20 Apr 2015 10:32:39 -0700 Subject: runtime: save registers in linux/{386,amd64} lib entry point The callee-saved registers must be saved because for the c-shared case this code is invoked from C code in the system library, and that code expects the registers to be saved. The tests were passing because in the normal case the code calls a cgo function that naturally saves callee-saved registers anyhow. However, it fails when the code takes the non-cgo path. Change-Id: I9c1f5e884f5a72db9614478049b1863641c8b2b9 Reviewed-on: https://go-review.googlesource.com/9114 Reviewed-by: David Crawshaw --- src/runtime/rt0_linux_amd64.s | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-) (limited to 'src/runtime/rt0_linux_amd64.s') diff --git a/src/runtime/rt0_linux_amd64.s b/src/runtime/rt0_linux_amd64.s index 9010aba271..ee1dbc6cd1 100644 --- a/src/runtime/rt0_linux_amd64.s +++ b/src/runtime/rt0_linux_amd64.s @@ -12,7 +12,14 @@ TEXT _rt0_amd64_linux(SB),NOSPLIT,$-8 // When building with -buildmode=c-shared, this symbol is called when the shared // library is loaded. -TEXT _rt0_amd64_linux_lib(SB),NOSPLIT,$40 +TEXT _rt0_amd64_linux_lib(SB),NOSPLIT,$0x58 + MOVQ BX, 0x18(SP) + MOVQ BP, 0x20(SP) + MOVQ R12, 0x28(SP) + MOVQ R13, 0x30(SP) + MOVQ R14, 0x38(SP) + MOVQ R15, 0x40(SP) + MOVQ DI, _rt0_amd64_linux_lib_argc<>(SB) MOVQ SI, _rt0_amd64_linux_lib_argv<>(SB) @@ -23,14 +30,23 @@ TEXT _rt0_amd64_linux_lib(SB),NOSPLIT,$40 MOVQ $_rt0_amd64_linux_lib_go(SB), DI MOVQ $0, SI CALL AX - RET + JMP restore + nocgo: MOVQ $8388608, 0(SP) // stacksize MOVQ $_rt0_amd64_linux_lib_go(SB), AX MOVQ AX, 8(SP) // fn - MOVQ $0, 16(SP) // fnarg + MOVQ $0, 0x10(SP) // fnarg MOVQ $runtime·newosproc0(SB), AX CALL AX + +restore: + MOVQ 0x18(SP), BX + MOVQ 0x20(SP), BP + MOVQ 0x28(SP), R12 + MOVQ 0x30(SP), R13 + MOVQ 0x38(SP), R14 + MOVQ 0x40(SP), R15 RET TEXT _rt0_amd64_linux_lib_go(SB),NOSPLIT,$0 -- cgit v1.3-5-g45d5