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runtime: shared library init support for android/arm.

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Follows http://golang.org/cl/8454, a similar CL for arm architectures.
This CL involves android-specific changes, namely, synthesizing
argv/auxv, as android doesn't provide those to the init functions.

This code is based on crawshaw@ android code in golang.org/x/mobile.

Change-Id: I32364efbb2662e80270a99bd7dfb1d0421b5417d
Reviewed-on: https://go-review.googlesource.com/8457
Reviewed-by: David Crawshaw <crawshaw@golang.org>
This commit is contained in:
Srdjan Petrovic 2015-04-03 09:48:51 -07:00 committed by David Crawshaw
parent 0d1c027bf3
commit d1eee2cebf
3 changed files with 25 additions and 5 deletions
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24
src/runtime/rt0_android_arm.s
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@ -10,8 +10,26 @@ TEXT _rt0_arm_android(SB),NOSPLIT,$-4
MOVW $_rt0_arm_linux1(SB), R4 MOVW $_rt0_arm_linux1(SB), R4
B (R4) B (R4)
// This symbol is called when a shared library is loaded. // When building with -buildmode=c-shared, this symbol is called when the shared
// library is loaded.
TEXT _rt0_arm_android_lib(SB),NOSPLIT,$0 TEXT _rt0_arm_android_lib(SB),NOSPLIT,$0
// TODO(crawshaw): initialize runtime. MOVW $1, R0 // argc
// At the moment this is done in mobile/app/android.c:init_go_runtime MOVW $_rt0_arm_android_argv(SB), R1 // **argv
BL _rt0_arm_linux_lib(SB)
RET RET
DATA _rt0_arm_android_argv+0x00(SB)/4,$_rt0_arm_android_argv0(SB)
DATA _rt0_arm_android_argv+0x04(SB)/4,$0
DATA _rt0_arm_android_argv+0x08(SB)/4,$0
DATA _rt0_arm_android_argv+0x0C(SB)/4,$15 // AT_PLATFORM
DATA _rt0_arm_android_argv+0x10(SB)/4,$_rt0_arm_android_auxv0(SB)
DATA _rt0_arm_android_argv+0x14(SB)/4,$16 // AT_HWCAP
DATA _rt0_arm_android_argv+0x18(SB)/4,$0x2040 // HWCAP_VFP | HWCAP_VFPv3
DATA _rt0_arm_android_argv+0x1C(SB)/4,$0
GLOBL _rt0_arm_android_argv(SB),NOPTR,$0x20
DATA _rt0_arm_android_argv0(SB)/8, $"gojni"
GLOBL _rt0_arm_android_argv0(SB),RODATA,$8
DATA _rt0_arm_android_auxv0(SB)/4, $"v7l"
GLOBL _rt0_arm_android_auxv0(SB),RODATA,$4

4
src/runtime/rt0_linux_amd64.s
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@ -10,8 +10,8 @@ TEXT _rt0_amd64_linux(SB),NOSPLIT,$-8
MOVQ $main(SB), AX MOVQ $main(SB), AX
JMP AX JMP AX
// When linking with -shared, this symbol is called when the shared library // When building with -buildmode=c-shared, this symbol is called when the shared
// is loaded. // library is loaded.
TEXT _rt0_amd64_linux_lib(SB),NOSPLIT,$40 TEXT _rt0_amd64_linux_lib(SB),NOSPLIT,$40
MOVQ DI, _rt0_amd64_linux_lib_argc<>(SB) MOVQ DI, _rt0_amd64_linux_lib_argc<>(SB)
MOVQ SI, _rt0_amd64_linux_lib_argv<>(SB) MOVQ SI, _rt0_amd64_linux_lib_argv<>(SB)

2
src/runtime/rt0_linux_arm.s
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@ -10,6 +10,8 @@ TEXT _rt0_arm_linux(SB),NOSPLIT,$-4
MOVW $_rt0_arm_linux1(SB), R4 MOVW $_rt0_arm_linux1(SB), R4
B (R4) B (R4)
// When building with -buildmode=c-shared, this symbol is called when the shared
// library is loaded.
TEXT _rt0_arm_linux_lib(SB),NOSPLIT,$40 TEXT _rt0_arm_linux_lib(SB),NOSPLIT,$40
// Preserve callee-save registers. Raspberry Pi's dlopen(), for example, // Preserve callee-save registers. Raspberry Pi's dlopen(), for example,
// actually cares that R11 is preserved. // actually cares that R11 is preserved.