mirror of
https://github.com/golang/go
synced 2024-11-20 03:04:40 -07:00
ca9128f18f
We initially added clone0 to handle the case when G or M don't exist, but it turns out that we could have just modified clone. (It also helps that the function we're invoking in clone0 no longer needs arguments.) As a side-effect, newosproc0 is now supported on all linux archs. Change-Id: Ie603af75d8f164310fc16446052d83743961f3ca Reviewed-on: https://go-review.googlesource.com/9164 Reviewed-by: David Crawshaw <crawshaw@golang.org>
141 lines
3.7 KiB
ArmAsm
141 lines
3.7 KiB
ArmAsm
// Copyright 2009 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
#include "textflag.h"
|
|
|
|
TEXT _rt0_arm_linux(SB),NOSPLIT,$-4
|
|
MOVW (R13), R0 // argc
|
|
MOVW $4(R13), R1 // argv
|
|
MOVW $_rt0_arm_linux1(SB), 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,$32
|
|
// 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)
|
|
|
|
// 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 R0, 4(R13)
|
|
MOVW R1, 8(R13)
|
|
BL runtime·newosproc0(SB)
|
|
rr:
|
|
// Restore callee-save registers and return.
|
|
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,$4
|
|
|
|
TEXT _rt0_arm_linux1(SB),NOSPLIT,$-4
|
|
// We first need to detect the kernel ABI, and warn the user
|
|
// if the system only supports OABI
|
|
// The strategy here is to call some EABI syscall to see if
|
|
// SIGILL is received.
|
|
// To catch SIGILL, we have to first setup sigaction, this is
|
|
// a chicken-and-egg problem, because we can't do syscall if
|
|
// we don't know the kernel ABI... Oh, not really, we can do
|
|
// syscall in Thumb mode.
|
|
|
|
// Save argc and argv
|
|
MOVM.DB.W [R0-R1], (R13)
|
|
|
|
// Thumb mode OABI check disabled because there are some
|
|
// EABI systems that do not support Thumb execution.
|
|
// We can run on them except for this check!
|
|
|
|
// // set up sa_handler
|
|
// MOVW $bad_abi<>(SB), R0 // sa_handler
|
|
// MOVW $0, R1 // sa_flags
|
|
// MOVW $0, R2 // sa_restorer
|
|
// MOVW $0, R3 // sa_mask
|
|
// MOVM.DB.W [R0-R3], (R13)
|
|
// MOVW $4, R0 // SIGILL
|
|
// MOVW R13, R1 // sa
|
|
// SUB $16, R13
|
|
// MOVW R13, R2 // old_sa
|
|
// MOVW $8, R3 // c
|
|
// MOVW $174, R7 // sys_sigaction
|
|
// BL oabi_syscall<>(SB)
|
|
|
|
// do an EABI syscall
|
|
MOVW $20, R7 // sys_getpid
|
|
SWI $0 // this will trigger SIGILL on OABI systems
|
|
|
|
// MOVW $4, R0 // SIGILL
|
|
// MOVW R13, R1 // sa
|
|
// MOVW $0, R2 // old_sa
|
|
// MOVW $8, R3 // c
|
|
// MOVW $174, R7 // sys_sigaction
|
|
// SWI $0 // restore signal handler
|
|
// ADD $32, R13
|
|
|
|
B runtime·rt0_go(SB)
|
|
|
|
TEXT bad_abi<>(SB),NOSPLIT,$-4
|
|
// give diagnosis and exit
|
|
MOVW $2, R0 // stderr
|
|
MOVW $bad_abi_msg(SB), R1 // data
|
|
MOVW $45, R2 // len
|
|
MOVW $4, R7 // sys_write
|
|
BL oabi_syscall<>(SB)
|
|
MOVW $1, R0
|
|
MOVW $1, R7 // sys_exit
|
|
BL oabi_syscall<>(SB)
|
|
B 0(PC)
|
|
|
|
DATA bad_abi_msg+0x00(SB)/8, $"This pro"
|
|
DATA bad_abi_msg+0x08(SB)/8, $"gram can"
|
|
DATA bad_abi_msg+0x10(SB)/8, $" only be"
|
|
DATA bad_abi_msg+0x18(SB)/8, $" run on "
|
|
DATA bad_abi_msg+0x20(SB)/8, $"EABI ker"
|
|
DATA bad_abi_msg+0x28(SB)/4, $"nels"
|
|
DATA bad_abi_msg+0x2c(SB)/1, $0xa
|
|
GLOBL bad_abi_msg(SB), RODATA, $45
|
|
|
|
TEXT oabi_syscall<>(SB),NOSPLIT,$-4
|
|
ADD $1, R15, R4 // R15 is hardware PC
|
|
WORD $0xe12fff14 //BX (R4) // enter thumb mode
|
|
// TODO(minux): only supports little-endian CPUs
|
|
WORD $0x4770df01 // swi $1; bx lr
|
|
|
|
TEXT main(SB),NOSPLIT,$-4
|
|
MOVW $_rt0_arm_linux1(SB), R4
|
|
B (R4)
|
|
|