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runtime: library entry point for darwin/arm

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Tested by using -buildmode=c-archive to generate an archive, add it
to an Xcode project and calling a Go function from an iOS app. (I'm
still investigating proper buildmode tests for all.bash.)

Change-Id: I7890df15246df8e90ad27837b8d64ba2cde409fe
Reviewed-on: https://go-review.googlesource.com/8719
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
David Crawshaw 2015-04-10 13:07:04 -04:00
parent 922a412822
commit 6e3a6c4d38
1 changed files with 41 additions and 0 deletions
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41
src/runtime/rt0_darwin_arm.s
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@ -11,6 +11,47 @@ TEXT _rt0_arm_darwin(SB),7,$-4
MOVW $main(SB), R4
B (R4)
// 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/arm platforms require
// cgo and do not support c-shared.
TEXT _rt0_arm_darwin_lib(SB),NOSPLIT,$12
MOVW R0, _rt0_arm_darwin_lib_argc<>(SB)
MOVW R1, _rt0_arm_darwin_lib_argv<>(SB)
// Create a new thread to do the runtime initialization and return.
MOVW _cgo_sys_thread_create(SB), R4
CMP $0, R4
B.EQ nocgo
MOVW $_rt0_arm_darwin_lib_go(SB), R0
MOVW $0, R1
BL (R4)
RET
nocgo:
MOVW $0x400000, R0
MOVW $_rt0_arm_darwin_lib_go(SB), R1
MOVW $0, R2
MOVW R0, (R13) // stacksize
MOVW R1, 4(R13) // fn
MOVW R2, 8(R13) // fnarg
MOVW $runtime·newosproc0(SB), R4
BL (R4)
RET
TEXT _rt0_arm_darwin_lib_go(SB),NOSPLIT,$0
MOVW _rt0_arm_darwin_lib_argc<>(SB), R0
MOVW _rt0_arm_darwin_lib_argv<>(SB), R1
MOVW R0, (R13)
MOVW R1, 4(R13)
MOVW $runtime·rt0_go(SB), R4
B (R4)
DATA _rt0_arm_darwin_lib_argc<>(SB)/4, $0
GLOBL _rt0_arm_darwin_lib_argc<>(SB),NOPTR, $4
DATA _rt0_arm_darwin_lib_argv<>(SB)/4, $0
GLOBL _rt0_arm_darwin_lib_argv<>(SB),NOPTR, $4
TEXT main(SB),NOSPLIT,$-8
// save argc and argv onto stack
MOVM.DB.W [R0-R1], (R13)