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runtime: c-shared entrypoint for linux/arm64 

Change-Id: I7dab124842f5209097a8d5a802fcbdde650654fa
Reviewed-on: https://go-review.googlesource.com/16395
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
David Crawshaw 2015-10-27 19:47:54 -04:00
parent bcc5c6aa50
commit 73ff7cb1ed
1 changed files with 44 additions and 0 deletions
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44
src/runtime/rt0_linux_arm64.s
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@ -9,6 +9,50 @@ TEXT _rt0_arm64_linux(SB),NOSPLIT,$-8
ADD $8, RSP, R1 // argv ADD $8, RSP, R1 // argv
BL main(SB) BL main(SB)
// When building with -buildmode=c-shared, this symbol is called when the shared
// library is loaded.
TEXT _rt0_arm64_linux_lib(SB),NOSPLIT,$40
// R27 is REGTMP, reserved for liblink. It is used below to
// move R0/R1 into globals. However in the standard ARM64 calling
// convention, it is a callee-saved register.
MOVD R27, 24(RSP)
MOVD R0, _rt0_arm64_linux_lib_argc<>(SB)
MOVD R1, _rt0_arm64_linux_lib_argv<>(SB)
// Create a new thread to do the runtime initialization and return.
MOVD _cgo_sys_thread_create(SB), R4
CMP $0, R4
BEQ nocgo
MOVD $_rt0_arm64_linux_lib_go(SB), R0
MOVD $0, R1
BL (R4)
B restore
nocgo:
MOVD $0x800000, R0 // stacksize = 8192KB
MOVD $_rt0_arm64_linux_lib_go(SB), R1
MOVD R0, 8(RSP)
MOVD R1, 16(RSP)
MOVD $runtime·newosproc0(SB),R4
BL (R4)
restore:
MOVD 24(RSP), R27
RET
TEXT _rt0_arm64_linux_lib_go(SB),NOSPLIT,$0
MOVD _rt0_arm64_linux_lib_argc<>(SB), R0
MOVD _rt0_arm64_linux_lib_argv<>(SB), R1
MOVD $runtime·rt0_go(SB),R4
B (R4)
DATA _rt0_arm64_linux_lib_argc<>(SB)/8, $0
GLOBL _rt0_arm64_linux_lib_argc<>(SB),NOPTR, $8
DATA _rt0_arm64_linux_lib_argv<>(SB)/8, $0
GLOBL _rt0_arm64_linux_lib_argv<>(SB),NOPTR, $8
TEXT main(SB),NOSPLIT,$-8 TEXT main(SB),NOSPLIT,$-8
MOVD $runtime·rt0_go(SB), R2 MOVD $runtime·rt0_go(SB), R2
BL (R2) BL (R2)