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| author | qmuntal <quimmuntal@gmail.com> | 2026-03-05 10:07:49 +0100 |
|---|---|---|
| committer | Gopher Robot <gobot@golang.org> | 2026-03-18 15:32:53 -0700 |
| commit | 6bdfdb5f51951584732e6a95a7ee8a5ba5e8cb93 (patch) | |
| tree | 5de5bf3d98eda9a353de1028b9e0836adb77ea2f /src/runtime/asm_amd64.s | |
| parent | 8e137ff9953d7a535170c9f3ff2c55811e7e13c3 (diff) | |
| download | go-6bdfdb5f51951584732e6a95a7ee8a5ba5e8cb93.tar.xz | |
runtime: implement part of library initialization in Go
All architectures supporting c-shared and c-archive share the same
initialization code in assembly, and most of it can be implemented in
pure Go.
Cq-Include-Trybots: luci.golang.try:gotip-darwin-arm64-longtest,gotip-linux-ppc64le_power10,gotip-linux-riscv64,gotip-linux-loong64,gotip-linux-s390x
Change-Id: Iaa9fb7d6f9ca8785f1098461646d607ef6b00d47
Reviewed-on: https://go-review.googlesource.com/c/go/+/706417
Auto-Submit: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Diffstat (limited to 'src/runtime/asm_amd64.s')
| -rw-r--r-- | src/runtime/asm_amd64.s | 49 |
1 files changed, 8 insertions, 41 deletions
diff --git a/src/runtime/asm_amd64.s b/src/runtime/asm_amd64.s index 09fd8e11d2..94120cdbed 100644 --- a/src/runtime/asm_amd64.s +++ b/src/runtime/asm_amd64.s @@ -36,55 +36,22 @@ TEXT _rt0_amd64_lib(SB),NOSPLIT|NOFRAME,$0 MOVQ DI, _rt0_amd64_lib_argc<>(SB) MOVQ SI, _rt0_amd64_lib_argv<>(SB) - // Synchronous initialization. -#ifndef GOOS_windows - // Avoid calling it on Windows because it is not used - // and it would crash the application due to the autogenerated - // ABI wrapper trying to access a non-existent TLS slot. - CALL runtime·libpreinit(SB) -#endif - - // Create a new thread to finish Go runtime initialization. - MOVQ _cgo_sys_thread_create(SB), AX - TESTQ AX, AX - JZ nocgo - - // We're calling back to C. - // Align stack per C ABI requirements. - MOVQ SP, BX // Callee-save in C ABI - ANDQ $~15, SP - MOVQ $_rt0_amd64_lib_go(SB), DI - MOVQ $0, SI #ifdef GOOS_windows - // For Windows ABI - MOVQ DI, CX - MOVQ SI, DX - // Leave space for four words on the stack as required - // by the Windows amd64 calling convention. - ADJSP $32 -#endif - CALL AX -#ifdef GOOS_windows - ADJSP $-32 // just to make the assembler not complain about unbalanced stack + // Set up a dummy TLS value on Windows so that the autogenerated + // ABI wrappers don't crash when trying to load G from TLS before + // wintls has set up the real TLS slot in rt0_go. + MOVQ $zeroTLS<>(SB), DI + CALL runtime·settls(SB) #endif - MOVQ BX, SP - JMP restore -nocgo: - ADJSP $16 - MOVQ $0x800000, 0(SP) // stacksize - MOVQ $_rt0_amd64_lib_go(SB), AX - MOVQ AX, 8(SP) // fn - CALL runtime·newosproc0(SB) - ADJSP $-16 + CALL runtime·libInit(SB) -restore: POP_REGS_HOST_TO_ABI0() RET -// _rt0_amd64_lib_go initializes the Go runtime. +// rt0_lib_go initializes the Go runtime. // This is started in a separate thread by _rt0_amd64_lib. -TEXT _rt0_amd64_lib_go(SB),NOSPLIT,$0 +TEXT runtime·rt0_lib_go<ABIInternal>(SB),NOSPLIT,$0 MOVQ _rt0_amd64_lib_argc<>(SB), DI MOVQ _rt0_amd64_lib_argv<>(SB), SI JMP runtime·rt0_go(SB) |