mirror of
https://github.com/golang/go
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3c94b1d305
Fixes linux builds (_vdso); may fix others. I can at least cross-compile cmd/go for every implemented system now. TBR=iant CC=golang-codereviews https://golang.org/cl/142630043
92 lines
2.5 KiB
ArmAsm
92 lines
2.5 KiB
ArmAsm
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "textflag.h"
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TEXT _rt0_arm_linux(SB),NOSPLIT,$-4
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MOVW (R13), R0 // argc
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MOVW $4(R13), R1 // argv
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MOVW $_rt0_arm_linux1(SB), R4
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B (R4)
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TEXT _rt0_arm_linux1(SB),NOSPLIT,$-4
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// We first need to detect the kernel ABI, and warn the user
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// if the system only supports OABI
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// The strategy here is to call some EABI syscall to see if
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// SIGILL is received.
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// To catch SIGILL, we have to first setup sigaction, this is
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// a chicken-and-egg problem, because we can't do syscall if
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// we don't know the kernel ABI... Oh, not really, we can do
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// syscall in Thumb mode.
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// Save argc and argv
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MOVM.DB.W [R0-R1], (R13)
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// Thumb mode OABI check disabled because there are some
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// EABI systems that do not support Thumb execution.
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// We can run on them except for this check!
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// // set up sa_handler
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// MOVW $bad_abi<>(SB), R0 // sa_handler
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// MOVW $0, R1 // sa_flags
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// MOVW $0, R2 // sa_restorer
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// MOVW $0, R3 // sa_mask
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// MOVM.DB.W [R0-R3], (R13)
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// MOVW $4, R0 // SIGILL
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// MOVW R13, R1 // sa
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// SUB $16, R13
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// MOVW R13, R2 // old_sa
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// MOVW $8, R3 // c
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// MOVW $174, R7 // sys_sigaction
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// BL oabi_syscall<>(SB)
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// do an EABI syscall
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MOVW $20, R7 // sys_getpid
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SWI $0 // this will trigger SIGILL on OABI systems
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// MOVW $4, R0 // SIGILL
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// MOVW R13, R1 // sa
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// MOVW $0, R2 // old_sa
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// MOVW $8, R3 // c
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// MOVW $174, R7 // sys_sigaction
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// SWI $0 // restore signal handler
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// ADD $32, R13
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SUB $4, R13 // fake a stack frame for runtime·setup_auxv
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BL runtime·setup_auxv(SB)
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ADD $4, R13
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B runtime·rt0_go(SB)
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TEXT bad_abi<>(SB),NOSPLIT,$-4
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// give diagnosis and exit
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MOVW $2, R0 // stderr
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MOVW $bad_abi_msg(SB), R1 // data
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MOVW $45, R2 // len
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MOVW $4, R7 // sys_write
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BL oabi_syscall<>(SB)
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MOVW $1, R0
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MOVW $1, R7 // sys_exit
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BL oabi_syscall<>(SB)
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B 0(PC)
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DATA bad_abi_msg+0x00(SB)/8, $"This pro"
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DATA bad_abi_msg+0x08(SB)/8, $"gram can"
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DATA bad_abi_msg+0x10(SB)/8, $" only be"
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DATA bad_abi_msg+0x18(SB)/8, $" run on "
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DATA bad_abi_msg+0x20(SB)/8, $"EABI ker"
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DATA bad_abi_msg+0x28(SB)/4, $"nels"
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DATA bad_abi_msg+0x2c(SB)/1, $0xa
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GLOBL bad_abi_msg(SB), RODATA, $45
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TEXT oabi_syscall<>(SB),NOSPLIT,$-4
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ADD $1, PC, R4
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WORD $0xe12fff14 //BX (R4) // enter thumb mode
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// TODO(minux): only supports little-endian CPUs
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WORD $0x4770df01 // swi $1; bx lr
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TEXT main(SB),NOSPLIT,$-4
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MOVW $_rt0_arm_linux1(SB), R4
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B (R4)
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