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runtime: darwin/arm64 c-archive entry point 

Change-Id: Ib227aa3e14d01a0ab1ad9e53d107858e045d1c42
Reviewed-on: https://go-review.googlesource.com/8984
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
David Crawshaw 2015-04-16 13:49:36 -04:00
parent 3eadc59b0d
commit e8b7133e9b
1 changed files with 34 additions and 0 deletions
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34
src/runtime/rt0_darwin_arm64.s
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@ -11,6 +11,40 @@ TEXT _rt0_arm64_darwin(SB),NOSPLIT,$-8
MOVD $1, R16 // SYS_exit
SVC $0x80
// When linking with -buildmode=c-archive or -buildmode=c-shared,
// this symbol is called from a global initialization function.
//
// Note that all currently shipping darwin/arm64 platforms require
// cgo and do not support c-shared.
TEXT _rt0_arm64_darwin_lib(SB),NOSPLIT,$0
// 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. So we save it to a
// temporary register.
MOVD R27, R7
MOVD R0, _rt0_arm64_darwin_lib_argc<>(SB)
MOVD R1, _rt0_arm64_darwin_lib_argv<>(SB)
// Create a new thread to do the runtime initialization and return.
MOVD _cgo_sys_thread_create(SB), R4
MOVD $_rt0_arm64_darwin_lib_go(SB), R0
MOVD $0, R1
BL (R4)
MOVD R7, R27
RET
TEXT _rt0_arm64_darwin_lib_go(SB),NOSPLIT,$0
MOVD _rt0_arm64_darwin_lib_argc<>(SB), R0
MOVD _rt0_arm64_darwin_lib_argv<>(SB), R1
MOVD $runtime·rt0_go(SB), R4
B (R4)
DATA _rt0_arm64_darwin_lib_argc<>(SB)/8, $0
GLOBL _rt0_arm64_darwin_lib_argc<>(SB),NOPTR, $8
DATA _rt0_arm64_darwin_lib_argv<>(SB)/8, $0
GLOBL _rt0_arm64_darwin_lib_argv<>(SB),NOPTR, $8
TEXT main(SB),NOSPLIT,$-8
MOVD $runtime·rt0_go(SB), R2
BL (R2)