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runtime: add support for --buildmode=c-shared on loong64

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These c-shared related CLs are follow up of CLs 455016, 455017, 455018. Here we
follow the LoongArch ELF psABI v2 standard, which requires the support of the
PCALAU12I instruction.

Updates #53301
Updates #58784

Change-Id: I7f1ddbf3b2470d610f12069d147aa9b3a6a96f32
Reviewed-on: https://go-review.googlesource.com/c/go/+/425474
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
limeidan 2022-08-25 11:07:25 +08:00 committed by Gopher Robot
parent a3dd959229
commit 80eeec6979
1 changed files with 51 additions and 0 deletions
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51
src/runtime/rt0_linux_loong64.s
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@ -3,6 +3,7 @@
// license that can be found in the LICENSE file.
#include "textflag.h"
#include "cgo/abi_loong64.h"
TEXT _rt0_loong64_linux(SB),NOSPLIT|NOFRAME,$0
// In a statically linked binary, the stack contains argc,
@ -13,6 +14,56 @@ TEXT _rt0_loong64_linux(SB),NOSPLIT|NOFRAME,$0
ADDV $8, R3, R5 // argv
JMP main(SB)
// When building with -buildmode=c-shared, this symbol is called when the shared
// library is loaded.
TEXT _rt0_loong64_linux_lib(SB),NOSPLIT,$168
// Preserve callee-save registers.
SAVE_R22_TO_R31(3*8)
SAVE_F24_TO_F31(13*8)
// Initialize g as nil in case of using g later e.g. sigaction in cgo_sigaction.go
MOVV R0, g
MOVV R4, _rt0_loong64_linux_lib_argc<>(SB)
MOVV R5, _rt0_loong64_linux_lib_argv<>(SB)
// Synchronous initialization.
MOVV $runtime·libpreinit(SB), R19
JAL (R19)
// Create a new thread to do the runtime initialization and return.
MOVV _cgo_sys_thread_create(SB), R19
BEQ R19, nocgo
MOVV $_rt0_loong64_linux_lib_go(SB), R4
MOVV $0, R5
JAL (R19)
JMP restore
nocgo:
MOVV $0x800000, R4 // stacksize = 8192KB
MOVV $_rt0_loong64_linux_lib_go(SB), R5
MOVV R4, 8(R3)
MOVV R5, 16(R3)
MOVV $runtime·newosproc0(SB), R19
JAL (R19)
restore:
// Restore callee-save registers.
RESTORE_R22_TO_R31(3*8)
RESTORE_F24_TO_F31(13*8)
RET
TEXT _rt0_loong64_linux_lib_go(SB),NOSPLIT,$0
MOVV _rt0_loong64_linux_lib_argc<>(SB), R4
MOVV _rt0_loong64_linux_lib_argv<>(SB), R5
MOVV $runtime·rt0_go(SB),R19
JMP (R19)
DATA _rt0_loong64_linux_lib_argc<>(SB)/8, $0
GLOBL _rt0_loong64_linux_lib_argc<>(SB),NOPTR, $8
DATA _rt0_loong64_linux_lib_argv<>(SB)/8, $0
GLOBL _rt0_loong64_linux_lib_argv<>(SB),NOPTR, $8
TEXT main(SB),NOSPLIT|NOFRAME,$0
// in external linking, glibc jumps to main with argc in R4
// and argv in R5