diff options
| author | Ian Lance Taylor <iant@golang.org> | 2017-10-13 13:52:57 -0700 |
|---|---|---|
| committer | Ian Lance Taylor <iant@golang.org> | 2017-10-25 00:40:40 +0000 |
| commit | d92aaa970791472a1657e878bf686fe802943ebe (patch) | |
| tree | 92c4fd495c5847ea382a5e53ecd075884e541dc2 /src/runtime/rt0_linux_arm.s | |
| parent | 253e605af4533fd9f1276291225c27e972417e97 (diff) | |
| download | go-d92aaa970791472a1657e878bf686fe802943ebe.tar.xz | |
runtime: unify arm entry point code
Change-Id: Id51a2d63f7199b3ff71cedd415345ad20e5bd981
Reviewed-on: https://go-review.googlesource.com/70791
Reviewed-by: Austin Clements <austin@google.com>
Diffstat (limited to 'src/runtime/rt0_linux_arm.s')
| -rw-r--r-- | src/runtime/rt0_linux_arm.s | 90 |
1 files changed, 5 insertions, 85 deletions
diff --git a/src/runtime/rt0_linux_arm.s b/src/runtime/rt0_linux_arm.s index b56ec75071..ba4ca2b10a 100644 --- a/src/runtime/rt0_linux_arm.s +++ b/src/runtime/rt0_linux_arm.s @@ -12,84 +12,8 @@ TEXT _rt0_arm_linux(SB),NOSPLIT,$-4 // When building with -buildmode=c-shared, this symbol is called when the shared // library is loaded. -TEXT _rt0_arm_linux_lib(SB),NOSPLIT,$104 - // Preserve callee-save registers. Raspberry Pi's dlopen(), for example, - // actually cares that R11 is preserved. - MOVW R4, 12(R13) - MOVW R5, 16(R13) - MOVW R6, 20(R13) - MOVW R7, 24(R13) - MOVW R8, 28(R13) - MOVW R11, 32(R13) - - // Skip floating point registers on GOARM < 6. - MOVB runtime·goarm(SB), R11 - CMP $6, R11 - BLT skipfpsave - MOVD F8, (32+8*1)(R13) - MOVD F9, (32+8*2)(R13) - MOVD F10, (32+8*3)(R13) - MOVD F11, (32+8*4)(R13) - MOVD F12, (32+8*5)(R13) - MOVD F13, (32+8*6)(R13) - MOVD F14, (32+8*7)(R13) - MOVD F15, (32+8*8)(R13) -skipfpsave: - // Save argc/argv. - MOVW R0, _rt0_arm_linux_lib_argc<>(SB) - MOVW R1, _rt0_arm_linux_lib_argv<>(SB) - - // Synchronous initialization. - MOVW $runtime·libpreinit(SB), R2 - CALL (R2) - - // 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 R0, 4(R13) - MOVW R1, 8(R13) - BL runtime·newosproc0(SB) -rr: - // Restore callee-save registers and return. - MOVB runtime·goarm(SB), R11 - CMP $6, R11 - BLT skipfprest - MOVD (32+8*1)(R13), F8 - MOVD (32+8*2)(R13), F9 - MOVD (32+8*3)(R13), F10 - MOVD (32+8*4)(R13), F11 - MOVD (32+8*5)(R13), F12 - MOVD (32+8*6)(R13), F13 - MOVD (32+8*7)(R13), F14 - MOVD (32+8*8)(R13), F15 -skipfprest: - MOVW 12(R13), R4 - MOVW 16(R13), R5 - MOVW 20(R13), R6 - MOVW 24(R13), R7 - MOVW 28(R13), R8 - MOVW 32(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_linux_lib(SB),NOSPLIT,$0 + B _rt0_arm_lib(SB) TEXT _rt0_arm_linux1(SB),NOSPLIT,$-4 // We first need to detect the kernel ABI, and warn the user @@ -98,16 +22,12 @@ TEXT _rt0_arm_linux1(SB),NOSPLIT,$-4 // SIGILL is received. // If you get a SIGILL here, you have the wrong kernel. - // Save argc and argv + // Save argc and argv (syscall will clobber at least R0). MOVM.DB.W [R0-R1], (R13) // do an EABI syscall MOVW $20, R7 // sys_getpid SWI $0 // this will trigger SIGILL on OABI systems - - B runtime·rt0_go(SB) - -TEXT main(SB),NOSPLIT,$-4 - MOVW $_rt0_arm_linux1(SB), R4 - B (R4) + MOVM.IA.W (R13), [R0-R1] + B runtime·rt0_go(SB) |