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go/src/runtime/sys_linux_arm.s
Austin Clements 4dcba023c6 runtime: use pselect6 for usleep on linux/amd64 and linux/arm 
Android O black-lists the select system call because its libc, Bionic,
does not use this system call. Replace our use of select with pselect6
(which is allowed) on the platforms that support targeting Android.
linux/arm64 already uses pselect6 because there is no select on arm64,
so only linux/amd64 and linux/arm need changing. pselect6 has been
available since Linux 2.6.16, which is before Go's minimum
requirement.

Fixes #20409.

Change-Id: Ic526b5b259a9e01d2f145a1f4d2e76e8c49ce809
Reviewed-on: https://go-review.googlesource.com/43641
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2017-05-19 16:05:39 +00:00

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// 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.
//
// System calls and other sys.stuff for arm, Linux
//
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
// for EABI, as we don't support OABI
#define SYS_BASE 0x0
#define SYS_exit (SYS_BASE + 1)
#define SYS_read (SYS_BASE + 3)
#define SYS_write (SYS_BASE + 4)
#define SYS_open (SYS_BASE + 5)
#define SYS_close (SYS_BASE + 6)
#define SYS_getpid (SYS_BASE + 20)
#define SYS_kill (SYS_BASE + 37)
#define SYS_gettimeofday (SYS_BASE + 78)
#define SYS_clone (SYS_BASE + 120)
#define SYS_rt_sigreturn (SYS_BASE + 173)
#define SYS_rt_sigaction (SYS_BASE + 174)
#define SYS_rt_sigprocmask (SYS_BASE + 175)
#define SYS_sigaltstack (SYS_BASE + 186)
#define SYS_mmap2 (SYS_BASE + 192)
#define SYS_futex (SYS_BASE + 240)
#define SYS_exit_group (SYS_BASE + 248)
#define SYS_munmap (SYS_BASE + 91)
#define SYS_madvise (SYS_BASE + 220)
#define SYS_setitimer (SYS_BASE + 104)
#define SYS_mincore (SYS_BASE + 219)
#define SYS_gettid (SYS_BASE + 224)
#define SYS_tkill (SYS_BASE + 238)
#define SYS_sched_yield (SYS_BASE + 158)
#define SYS_pselect6 (SYS_BASE + 335)
#define SYS_ugetrlimit (SYS_BASE + 191)
#define SYS_sched_getaffinity (SYS_BASE + 242)
#define SYS_clock_gettime (SYS_BASE + 263)
#define SYS_epoll_create (SYS_BASE + 250)
#define SYS_epoll_ctl (SYS_BASE + 251)
#define SYS_epoll_wait (SYS_BASE + 252)
#define SYS_epoll_create1 (SYS_BASE + 357)
#define SYS_fcntl (SYS_BASE + 55)
#define SYS_access (SYS_BASE + 33)
#define SYS_connect (SYS_BASE + 283)
#define SYS_socket (SYS_BASE + 281)
#define SYS_brk (SYS_BASE + 45)
#define ARM_BASE (SYS_BASE + 0x0f0000)
TEXT runtime·open(SB),NOSPLIT,$0
MOVW name+0(FP), R0
MOVW mode+4(FP), R1
MOVW perm+8(FP), R2
MOVW $SYS_open, R7
SWI $0
MOVW $0xfffff001, R1
CMP R1, R0
MOVW.HI $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT,$0
MOVW fd+0(FP), R0
MOVW $SYS_close, R7
SWI $0
MOVW $0xfffff001, R1
CMP R1, R0
MOVW.HI $-1, R0
MOVW R0, ret+4(FP)
RET
TEXT runtime·write(SB),NOSPLIT,$0
MOVW fd+0(FP), R0
MOVW p+4(FP), R1
MOVW n+8(FP), R2
MOVW $SYS_write, R7
SWI $0
MOVW $0xfffff001, R1
CMP R1, R0
MOVW.HI $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·read(SB),NOSPLIT,$0
MOVW fd+0(FP), R0
MOVW p+4(FP), R1
MOVW n+8(FP), R2
MOVW $SYS_read, R7
SWI $0
MOVW $0xfffff001, R1
CMP R1, R0
MOVW.HI $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·getrlimit(SB),NOSPLIT,$0
MOVW kind+0(FP), R0
MOVW limit+4(FP), R1
MOVW $SYS_ugetrlimit, R7
SWI $0
MOVW R0, ret+8(FP)
RET
TEXT runtime·exit(SB),NOSPLIT,$-4
MOVW code+0(FP), R0
MOVW $SYS_exit_group, R7
SWI $0
MOVW $1234, R0
MOVW $1002, R1
MOVW R0, (R1) // fail hard
TEXT runtime·exit1(SB),NOSPLIT,$-4
MOVW code+0(FP), R0
MOVW $SYS_exit, R7
SWI $0
MOVW $1234, R0
MOVW $1003, R1
MOVW R0, (R1) // fail hard
TEXT runtime·gettid(SB),NOSPLIT,$0-4
MOVW $SYS_gettid, R7
SWI $0
MOVW R0, ret+0(FP)
RET
TEXT runtime·raise(SB),NOSPLIT,$-4
MOVW $SYS_gettid, R7
SWI $0
// arg 1 tid already in R0 from gettid
MOVW sig+0(FP), R1 // arg 2 - signal
MOVW $SYS_tkill, R7
SWI $0
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$-4
MOVW $SYS_getpid, R7
SWI $0
// arg 1 tid already in R0 from getpid
MOVW sig+0(FP), R1 // arg 2 - signal
MOVW $SYS_kill, R7
SWI $0
RET
TEXT runtime·mmap(SB),NOSPLIT,$0
MOVW addr+0(FP), R0
MOVW n+4(FP), R1
MOVW prot+8(FP), R2
MOVW flags+12(FP), R3
MOVW fd+16(FP), R4
MOVW off+20(FP), R5
MOVW $SYS_mmap2, R7
SWI $0
MOVW $0xfffff001, R6
CMP R6, R0
RSB.HI $0, R0
MOVW R0, ret+24(FP)
RET
TEXT runtime·munmap(SB),NOSPLIT,$0
MOVW addr+0(FP), R0
MOVW n+4(FP), R1
MOVW $SYS_munmap, R7
SWI $0
MOVW $0xfffff001, R6
CMP R6, R0
MOVW.HI $0, R8 // crash on syscall failure
MOVW.HI R8, (R8)
RET
TEXT runtime·madvise(SB),NOSPLIT,$0
MOVW addr+0(FP), R0
MOVW n+4(FP), R1
MOVW flags+8(FP), R2
MOVW $SYS_madvise, R7
SWI $0
// ignore failure - maybe pages are locked
RET
TEXT runtime·setitimer(SB),NOSPLIT,$0
MOVW mode+0(FP), R0
MOVW new+4(FP), R1
MOVW old+8(FP), R2
MOVW $SYS_setitimer, R7
SWI $0
RET
TEXT runtime·mincore(SB),NOSPLIT,$0
MOVW addr+0(FP), R0
MOVW n+4(FP), R1
MOVW dst+8(FP), R2
MOVW $SYS_mincore, R7
SWI $0
MOVW R0, ret+12(FP)
RET
TEXT runtime·walltime(SB), NOSPLIT, $32
MOVW $0, R0 // CLOCK_REALTIME
MOVW $8(R13), R1 // timespec
MOVW $SYS_clock_gettime, R7
SWI $0
MOVW 8(R13), R0 // sec
MOVW 12(R13), R2 // nsec
MOVW R0, sec_lo+0(FP)
MOVW $0, R1
MOVW R1, sec_hi+4(FP)
MOVW R2, nsec+8(FP)
RET
// int64 nanotime(void)
TEXT runtime·nanotime(SB),NOSPLIT,$32
MOVW $1, R0 // CLOCK_MONOTONIC
MOVW $8(R13), R1 // timespec
MOVW $SYS_clock_gettime, R7
SWI $0
MOVW 8(R13), R0 // sec
MOVW 12(R13), R2 // nsec
MOVW $1000000000, R3
MULLU R0, R3, (R1, R0)
MOVW $0, R4
ADD.S R2, R0
ADC R4, R1
MOVW R0, ret_lo+0(FP)
MOVW R1, ret_hi+4(FP)
RET
// int32 futex(int32 *uaddr, int32 op, int32 val,
// struct timespec *timeout, int32 *uaddr2, int32 val2);
TEXT runtime·futex(SB),NOSPLIT,$0
MOVW addr+0(FP), R0
MOVW op+4(FP), R1
MOVW val+8(FP), R2
MOVW ts+12(FP), R3
MOVW addr2+16(FP), R4
MOVW val3+20(FP), R5
MOVW $SYS_futex, R7
SWI $0
MOVW R0, ret+24(FP)
RET
// int32 clone(int32 flags, void *stack, M *mp, G *gp, void (*fn)(void));
TEXT runtime·clone(SB),NOSPLIT,$0
MOVW flags+0(FP), R0
MOVW stk+4(FP), R1
MOVW $0, R2 // parent tid ptr
MOVW $0, R3 // tls_val
MOVW $0, R4 // child tid ptr
MOVW $0, R5
// Copy mp, gp, fn off parent stack for use by child.
// TODO(kaib): figure out which registers are clobbered by clone and avoid stack copying
MOVW $-16(R1), R1
MOVW mp+8(FP), R6
MOVW R6, 0(R1)
MOVW gp+12(FP), R6
MOVW R6, 4(R1)
MOVW fn+16(FP), R6
MOVW R6, 8(R1)
MOVW $1234, R6
MOVW R6, 12(R1)
MOVW $SYS_clone, R7
SWI $0
// In parent, return.
CMP $0, R0
BEQ 3(PC)
MOVW R0, ret+20(FP)
RET
// Paranoia: check that SP is as we expect. Use R13 to avoid linker 'fixup'
MOVW 12(R13), R0
MOVW $1234, R1
CMP R0, R1
BEQ 2(PC)
BL runtime·abort(SB)
MOVW 0(R13), R8 // m
MOVW 4(R13), R0 // g
CMP $0, R8
BEQ nog
CMP $0, R0
BEQ nog
MOVW R0, g
MOVW R8, g_m(g)
// paranoia; check they are not nil
MOVW 0(R8), R0
MOVW 0(g), R0
BL runtime·emptyfunc(SB) // fault if stack check is wrong
// Initialize m->procid to Linux tid
MOVW $SYS_gettid, R7
SWI $0
MOVW g_m(g), R8
MOVW R0, m_procid(R8)
nog:
// Call fn
MOVW 8(R13), R0
MOVW $16(R13), R13
BL (R0)
// It shouldn't return. If it does, exit that thread.
SUB $16, R13 // restore the stack pointer to avoid memory corruption
MOVW $0, R0
MOVW R0, 4(R13)
BL runtime·exit1(SB)
MOVW $1234, R0
MOVW $1005, R1
MOVW R0, (R1)
TEXT runtime·sigaltstack(SB),NOSPLIT,$0
MOVW new+0(FP), R0
MOVW old+4(FP), R1
MOVW $SYS_sigaltstack, R7
SWI $0
MOVW $0xfffff001, R6
CMP R6, R0
MOVW.HI $0, R8 // crash on syscall failure
MOVW.HI R8, (R8)
RET
TEXT runtime·sigfwd(SB),NOSPLIT,$0-16
MOVW sig+4(FP), R0
MOVW info+8(FP), R1
MOVW ctx+12(FP), R2
MOVW fn+0(FP), R11
MOVW R13, R4
SUB $24, R13
BIC $0x7, R13 // alignment for ELF ABI
BL (R11)
MOVW R4, R13
RET
TEXT runtime·sigtramp(SB),NOSPLIT,$12
// this might be called in external code context,
// where g is not set.
// first save R0, because runtime·load_g will clobber it
MOVW R0, 4(R13)
MOVB runtime·iscgo(SB), R0
CMP $0, R0
BL.NE runtime·load_g(SB)
MOVW R1, 8(R13)
MOVW R2, 12(R13)
MOVW $runtime·sigtrampgo(SB), R11
BL (R11)
RET
TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
MOVW $runtime·sigtramp(SB), R11
B (R11)
TEXT runtime·rtsigprocmask(SB),NOSPLIT,$0
MOVW how+0(FP), R0
MOVW new+4(FP), R1
MOVW old+8(FP), R2
MOVW size+12(FP), R3
MOVW $SYS_rt_sigprocmask, R7
SWI $0
RET
TEXT runtime·rt_sigaction(SB),NOSPLIT,$0
MOVW sig+0(FP), R0
MOVW new+4(FP), R1
MOVW old+8(FP), R2
MOVW size+12(FP), R3
MOVW $SYS_rt_sigaction, R7
SWI $0
MOVW R0, ret+16(FP)
RET
TEXT runtime·usleep(SB),NOSPLIT,$12
MOVW usec+0(FP), R0
CALL runtime·usplitR0(SB)
MOVW R0, 4(R13)
MOVW $1000, R0 // usec to nsec
MUL R0, R1
MOVW R1, 8(R13)
MOVW $0, R0
MOVW $0, R1
MOVW $0, R2
MOVW $0, R3
MOVW $4(R13), R4
MOVW $0, R5
MOVW $SYS_pselect6, R7
SWI $0
RET
// As for cas, memory barriers are complicated on ARM, but the kernel
// provides a user helper. ARMv5 does not support SMP and has no
// memory barrier instruction at all. ARMv6 added SMP support and has
// a memory barrier, but it requires writing to a coprocessor
// register. ARMv7 introduced the DMB instruction, but it's expensive
// even on single-core devices. The kernel helper takes care of all of
// this for us.
TEXT publicationBarrier<>(SB),NOSPLIT,$0
// void __kuser_memory_barrier(void);
MOVW $0xffff0fa0, R15 // R15 is hardware PC.
TEXT ·publicationBarrier(SB),NOSPLIT,$0
BL publicationBarrier<>(SB)
RET
TEXT runtime·osyield(SB),NOSPLIT,$0
MOVW $SYS_sched_yield, R7
SWI $0
RET
TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0
MOVW pid+0(FP), R0
MOVW len+4(FP), R1
MOVW buf+8(FP), R2
MOVW $SYS_sched_getaffinity, R7
SWI $0
MOVW R0, ret+12(FP)
RET
// int32 runtime·epollcreate(int32 size)
TEXT runtime·epollcreate(SB),NOSPLIT,$0
MOVW size+0(FP), R0
MOVW $SYS_epoll_create, R7
SWI $0
MOVW R0, ret+4(FP)
RET
// int32 runtime·epollcreate1(int32 flags)
TEXT runtime·epollcreate1(SB),NOSPLIT,$0
MOVW flags+0(FP), R0
MOVW $SYS_epoll_create1, R7
SWI $0
MOVW R0, ret+4(FP)
RET
// func epollctl(epfd, op, fd int32, ev *epollEvent) int
TEXT runtime·epollctl(SB),NOSPLIT,$0
MOVW epfd+0(FP), R0
MOVW op+4(FP), R1
MOVW fd+8(FP), R2
MOVW ev+12(FP), R3
MOVW $SYS_epoll_ctl, R7
SWI $0
MOVW R0, ret+16(FP)
RET
// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout)
TEXT runtime·epollwait(SB),NOSPLIT,$0
MOVW epfd+0(FP), R0
MOVW ev+4(FP), R1
MOVW nev+8(FP), R2
MOVW timeout+12(FP), R3
MOVW $SYS_epoll_wait, R7
SWI $0
MOVW R0, ret+16(FP)
RET
// void runtime·closeonexec(int32 fd)
TEXT runtime·closeonexec(SB),NOSPLIT,$0
MOVW fd+0(FP), R0 // fd
MOVW $2, R1 // F_SETFD
MOVW $1, R2 // FD_CLOEXEC
MOVW $SYS_fcntl, R7
SWI $0
RET
// b __kuser_get_tls @ 0xffff0fe0
TEXT runtime·read_tls_fallback(SB),NOSPLIT,$-4
MOVW $0xffff0fe0, R0
B (R0)
TEXT runtime·access(SB),NOSPLIT,$0
MOVW name+0(FP), R0
MOVW mode+4(FP), R1
MOVW $SYS_access, R7
SWI $0
MOVW R0, ret+8(FP)
RET
TEXT runtime·connect(SB),NOSPLIT,$0
MOVW fd+0(FP), R0
MOVW addr+4(FP), R1
MOVW len+8(FP), R2
MOVW $SYS_connect, R7
SWI $0
MOVW R0, ret+12(FP)
RET
TEXT runtime·socket(SB),NOSPLIT,$0
MOVW domain+0(FP), R0
MOVW typ+4(FP), R1
MOVW prot+8(FP), R2
MOVW $SYS_socket, R7
SWI $0
MOVW R0, ret+12(FP)
RET
// func sbrk0() uintptr
TEXT runtime·sbrk0(SB),NOSPLIT,$0-4
// Implemented as brk(NULL).
MOVW $0, R0
MOVW $SYS_brk, R7
SWI $0
MOVW R0, ret+0(FP)
RET
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