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| author | Srdjan Petrovic <spetrovic@google.com> | 2015-04-03 09:40:10 -0700 |
|---|---|---|
| committer | David Crawshaw <crawshaw@golang.org> | 2015-04-13 18:58:18 +0000 |
| commit | 93644c9118dfcd5c7b46d22fbe6b7f1cb1f1b696 (patch) | |
| tree | 1a6b7fc7a3522c54793192ea99675ab26489c49c /src/runtime/rt0_linux_arm.s | |
| parent | fdab2f92eab01e8aca980c76cba18c2361cb0fc7 (diff) | |
| download | go-93644c9118dfcd5c7b46d22fbe6b7f1cb1f1b696.tar.gz go-93644c9118dfcd5c7b46d22fbe6b7f1cb1f1b696.zip | |
runtime: shared library runtime init for arm
Adds the runtime initialization flow for arm akin to amd64.
In particular,we use the library initialization entry point to:
- create a new OS thread and run the "regular" runtime init stack on
that thread
- return immediately from the main (i.e., loader) thread
- at the first CGO invocation, we wait for the runtime initialization
to complete.
Verified to work on a Raspberry Pi and an Android phone.
Change-Id: I32f39228ae30a03ce9569287f234b305790fecf6
Reviewed-on: https://go-review.googlesource.com/8455
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Run-TryBot: Srdjan Petrovic <spetrovic@google.com>
Diffstat (limited to 'src/runtime/rt0_linux_arm.s')
| -rw-r--r-- | src/runtime/rt0_linux_arm.s | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/runtime/rt0_linux_arm.s b/src/runtime/rt0_linux_arm.s index 15c1092a36..cd79619a59 100644 --- a/src/runtime/rt0_linux_arm.s +++ b/src/runtime/rt0_linux_arm.s @@ -10,6 +10,58 @@ TEXT _rt0_arm_linux(SB),NOSPLIT,$-4 MOVW $_rt0_arm_linux1(SB), R4 B (R4) +TEXT _rt0_arm_linux_lib(SB),NOSPLIT,$40 + // Preserve callee-save registers. Raspberry Pi's dlopen(), for example, + // actually cares that R11 is preserved. + MOVW R4, 16(R13) + MOVW R5, 20(R13) + MOVW R6, 24(R13) + MOVW R7, 28(R13) + MOVW R8, 32(R13) + MOVW R11, 36(R13) + + // Save argc/argv. + MOVW R0, _rt0_arm_linux_lib_argc<>(SB) + MOVW R1, _rt0_arm_linux_lib_argv<>(SB) + + // Create a new thread to do the runtime initialization. + MOVW _cgo_sys_thread_create(SB), R2 + CMP $0, R2 + BEQ nocgo + MOVW $_rt0_arm_linux_lib_go<>(SB), R0 + MOVW $0, R1 + BL (R2) + B rr +nocgo: + MOVW $0x800000, R0 // stacksize = 8192KB + MOVW $_rt0_arm_linux_lib_go<>(SB), R1 // fn + MOVW $0, R2 // fnarg + MOVW R0, 4(R13) + MOVW R1, 8(R13) + MOVW R2, 12(R13) + BL runtime·newosproc0(SB) +rr: + // Restore callee-save registers and return. + MOVW 16(R13), R4 + MOVW 20(R13), R5 + MOVW 24(R13), R6 + MOVW 28(R13), R7 + MOVW 32(R13), R8 + MOVW 36(R13), R11 + RET + +TEXT _rt0_arm_linux_lib_go<>(SB),NOSPLIT,$8 + MOVW _rt0_arm_linux_lib_argc<>(SB), R0 + MOVW _rt0_arm_linux_lib_argv<>(SB), R1 + MOVW R0, 0(R13) + MOVW R1, 4(R13) + B runtime·rt0_go(SB) + +DATA _rt0_arm_linux_lib_argc<>(SB)/4,$0 +GLOBL _rt0_arm_linux_lib_argc<>(SB),NOPTR,$4 +DATA _rt0_arm_linux_lib_argv<>(SB)/4,$0 +GLOBL _rt0_arm_linux_lib_argv<>(SB),NOPTR,$4 + TEXT _rt0_arm_linux1(SB),NOSPLIT,$-4 // We first need to detect the kernel ABI, and warn the user // if the system only supports OABI |