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go/src/runtime/sys_linux_ppc64x.s
Austin Clements bb6309cd63 runtime: inform arena placement using sbrk(0) 
On 32-bit architectures (or if we fail to map a 64-bit-style arena),
we try to map the heap arena just above the end of the process image.
While we can accept any address, using lower addresses is preferable
because lower addresses cause us to map less of the heap bitmap.

However, if a program is linked against C code that has global
constructors, those constructors may call brk/sbrk to allocate memory
(e.g., many C malloc implementations do this for small allocations).
The brk also starts just above the process image, so this may adjust
the brk past the beginning of where we want to put the heap arena. In
this case, the kernel will pick a different address for the arena and
it will usually be very high (at least, as these things go in a 32-bit
address space).

Fix this by consulting the current value of the brk and using this in
addition to the end of the process image to compute the initial arena
placement.

This is implemented only on Linux currently, since we have no evidence
that it's an issue on any other OSes.

Fixes #19831.

Change-Id: Id64b45d08d8c91e4f50d92d0339146250b04f2f8
Reviewed-on: https://go-review.googlesource.com/39810
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2017-04-21 14:34:10 +00:00

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// Copyright 2014 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.
// +build linux
// +build ppc64 ppc64le
//
// System calls and other sys.stuff for ppc64, Linux
//
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
#include "asm_ppc64x.h"
#define SYS_exit 1
#define SYS_read 3
#define SYS_write 4
#define SYS_open 5
#define SYS_close 6
#define SYS_getpid 20
#define SYS_kill 37
#define SYS_brk 45
#define SYS_fcntl 55
#define SYS_gettimeofday 78
#define SYS_select 82 // always return -ENOSYS
#define SYS_mmap 90
#define SYS_munmap 91
#define SYS_setitimer 104
#define SYS_clone 120
#define SYS_newselect 142
#define SYS_sched_yield 158
#define SYS_rt_sigreturn 172
#define SYS_rt_sigaction 173
#define SYS_rt_sigprocmask 174
#define SYS_sigaltstack 185
#define SYS_ugetrlimit 190
#define SYS_madvise 205
#define SYS_mincore 206
#define SYS_gettid 207
#define SYS_tkill 208
#define SYS_futex 221
#define SYS_sched_getaffinity 223
#define SYS_exit_group 234
#define SYS_epoll_create 236
#define SYS_epoll_ctl 237
#define SYS_epoll_wait 238
#define SYS_clock_gettime 246
#define SYS_epoll_create1 315
TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
MOVW code+0(FP), R3
SYSCALL $SYS_exit_group
RET
TEXT runtime·exit1(SB),NOSPLIT|NOFRAME,$0-4
MOVW code+0(FP), R3
SYSCALL $SYS_exit
RET
TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0-20
MOVD name+0(FP), R3
MOVW mode+8(FP), R4
MOVW perm+12(FP), R5
SYSCALL $SYS_open
BVC 2(PC)
MOVW $-1, R3
MOVW R3, ret+16(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12
MOVW fd+0(FP), R3
SYSCALL $SYS_close
BVC 2(PC)
MOVW $-1, R3
MOVW R3, ret+8(FP)
RET
TEXT runtime·write(SB),NOSPLIT|NOFRAME,$0-28
MOVD fd+0(FP), R3
MOVD p+8(FP), R4
MOVW n+16(FP), R5
SYSCALL $SYS_write
BVC 2(PC)
MOVW $-1, R3
MOVW R3, ret+24(FP)
RET
TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0-28
MOVW fd+0(FP), R3
MOVD p+8(FP), R4
MOVW n+16(FP), R5
SYSCALL $SYS_read
BVC 2(PC)
MOVW $-1, R3
MOVW R3, ret+24(FP)
RET
TEXT runtime·getrlimit(SB),NOSPLIT|NOFRAME,$0-20
MOVW kind+0(FP), R3
MOVD limit+8(FP), R4
SYSCALL $SYS_ugetrlimit
MOVW R3, ret+16(FP)
RET
TEXT runtime·usleep(SB),NOSPLIT,$16-4
MOVW usec+0(FP), R3
MOVD R3, R5
MOVW $1000000, R4
DIVD R4, R3
MOVD R3, 8(R1)
MULLD R3, R4
SUB R4, R5
MOVD R5, 16(R1)
// select(0, 0, 0, 0, &tv)
MOVW $0, R3
MOVW $0, R4
MOVW $0, R5
MOVW $0, R6
ADD $8, R1, R7
SYSCALL $SYS_newselect
RET
TEXT runtime·gettid(SB),NOSPLIT,$0-4
SYSCALL $SYS_gettid
MOVW R3, ret+0(FP)
RET
TEXT runtime·raise(SB),NOSPLIT|NOFRAME,$0
SYSCALL $SYS_gettid
MOVW R3, R3 // arg 1 tid
MOVW sig+0(FP), R4 // arg 2
SYSCALL $SYS_tkill
RET
TEXT runtime·raiseproc(SB),NOSPLIT|NOFRAME,$0
SYSCALL $SYS_getpid
MOVW R3, R3 // arg 1 pid
MOVW sig+0(FP), R4 // arg 2
SYSCALL $SYS_kill
RET
TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0-24
MOVW mode+0(FP), R3
MOVD new+8(FP), R4
MOVD old+16(FP), R5
SYSCALL $SYS_setitimer
RET
TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28
MOVD addr+0(FP), R3
MOVD n+8(FP), R4
MOVD dst+16(FP), R5
SYSCALL $SYS_mincore
NEG R3 // caller expects negative errno
MOVW R3, ret+24(FP)
RET
// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB),NOSPLIT,$16
MOVD $0, R3 // CLOCK_REALTIME
MOVD $0(R1), R4
SYSCALL $SYS_clock_gettime
MOVD 0(R1), R3 // sec
MOVD 8(R1), R5 // nsec
MOVD R3, sec+0(FP)
MOVW R5, nsec+8(FP)
RET
TEXT runtime·nanotime(SB),NOSPLIT,$16
MOVW $1, R3 // CLOCK_MONOTONIC
MOVD $0(R1), R4
SYSCALL $SYS_clock_gettime
MOVD 0(R1), R3 // sec
MOVD 8(R1), R5 // nsec
// sec is in R3, nsec in R5
// return nsec in R3
MOVD $1000000000, R4
MULLD R4, R3
ADD R5, R3
MOVD R3, ret+0(FP)
RET
TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28
MOVW how+0(FP), R3
MOVD new+8(FP), R4
MOVD old+16(FP), R5
MOVW size+24(FP), R6
SYSCALL $SYS_rt_sigprocmask
BVC 2(PC)
MOVD R0, 0xf0(R0) // crash
RET
TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36
MOVD sig+0(FP), R3
MOVD new+8(FP), R4
MOVD old+16(FP), R5
MOVD size+24(FP), R6
SYSCALL $SYS_rt_sigaction
MOVW R3, ret+32(FP)
RET
TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
MOVW sig+8(FP), R3
MOVD info+16(FP), R4
MOVD ctx+24(FP), R5
MOVD fn+0(FP), R12
MOVD R12, CTR
BL (CTR)
MOVD 24(R1), R2
RET
#ifdef GOARCH_ppc64le
// ppc64le doesn't need function descriptors
TEXT runtime·sigtramp(SB),NOSPLIT,$64
#else
// function descriptor for the real sigtramp
TEXT runtime·sigtramp(SB),NOSPLIT|NOFRAME,$0
DWORD $runtime·_sigtramp(SB)
DWORD $0
DWORD $0
TEXT runtime·_sigtramp(SB),NOSPLIT,$64
#endif
// initialize essential registers (just in case)
BL runtime·reginit(SB)
// this might be called in external code context,
// where g is not set.
MOVB runtime·iscgo(SB), R6
CMP R6, $0
BEQ 2(PC)
BL runtime·load_g(SB)
MOVW R3, FIXED_FRAME+0(R1)
MOVD R4, FIXED_FRAME+8(R1)
MOVD R5, FIXED_FRAME+16(R1)
MOVD $runtime·sigtrampgo(SB), R12
MOVD R12, CTR
BL (CTR)
MOVD 24(R1), R2
RET
#ifdef GOARCH_ppc64le
// ppc64le doesn't need function descriptors
TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
#else
// function descriptor for the real sigtramp
TEXT runtime·cgoSigtramp(SB),NOSPLIT|NOFRAME,$0
DWORD $runtime·_cgoSigtramp(SB)
DWORD $0
DWORD $0
TEXT runtime·_cgoSigtramp(SB),NOSPLIT,$0
#endif
MOVD $runtime·sigtramp(SB), R12
MOVD R12, CTR
JMP (CTR)
TEXT runtime·mmap(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R3
MOVD n+8(FP), R4
MOVW prot+16(FP), R5
MOVW flags+20(FP), R6
MOVW fd+24(FP), R7
MOVW off+28(FP), R8
SYSCALL $SYS_mmap
MOVD R3, ret+32(FP)
RET
TEXT runtime·munmap(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R3
MOVD n+8(FP), R4
SYSCALL $SYS_munmap
BVC 2(PC)
MOVD R0, 0xf0(R0)
RET
TEXT runtime·madvise(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R3
MOVD n+8(FP), R4
MOVW flags+16(FP), R5
SYSCALL $SYS_madvise
// ignore failure - maybe pages are locked
RET
// int64 futex(int32 *uaddr, int32 op, int32 val,
// struct timespec *timeout, int32 *uaddr2, int32 val2);
TEXT runtime·futex(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R3
MOVW op+8(FP), R4
MOVW val+12(FP), R5
MOVD ts+16(FP), R6
MOVD addr2+24(FP), R7
MOVW val3+32(FP), R8
SYSCALL $SYS_futex
MOVW R3, ret+40(FP)
RET
// int64 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void));
TEXT runtime·clone(SB),NOSPLIT|NOFRAME,$0
MOVW flags+0(FP), R3
MOVD stk+8(FP), R4
// Copy mp, gp, fn off parent stack for use by child.
// Careful: Linux system call clobbers ???.
MOVD mp+16(FP), R7
MOVD gp+24(FP), R8
MOVD fn+32(FP), R12
MOVD R7, -8(R4)
MOVD R8, -16(R4)
MOVD R12, -24(R4)
MOVD $1234, R7
MOVD R7, -32(R4)
SYSCALL $SYS_clone
// In parent, return.
CMP R3, $0
BEQ 3(PC)
MOVW R3, ret+40(FP)
RET
// In child, on new stack.
// initialize essential registers
BL runtime·reginit(SB)
MOVD -32(R1), R7
CMP R7, $1234
BEQ 2(PC)
MOVD R0, 0(R0)
// Initialize m->procid to Linux tid
SYSCALL $SYS_gettid
MOVD -24(R1), R12 // fn
MOVD -16(R1), R8 // g
MOVD -8(R1), R7 // m
CMP R7, $0
BEQ nog
CMP R8, $0
BEQ nog
MOVD R3, m_procid(R7)
// TODO: setup TLS.
// In child, set up new stack
MOVD R7, g_m(R8)
MOVD R8, g
//CALL runtime·stackcheck(SB)
nog:
// Call fn
MOVD R12, CTR
BL (CTR)
// It shouldn't return. If it does, exit that thread.
MOVW $111, R3
SYSCALL $SYS_exit
BR -2(PC) // keep exiting
TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
MOVD new+0(FP), R3
MOVD old+8(FP), R4
SYSCALL $SYS_sigaltstack
BVC 2(PC)
MOVD R0, 0xf0(R0) // crash
RET
TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
SYSCALL $SYS_sched_yield
RET
TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
MOVD pid+0(FP), R3
MOVD len+8(FP), R4
MOVD buf+16(FP), R5
SYSCALL $SYS_sched_getaffinity
MOVW R3, ret+24(FP)
RET
// int32 runtime·epollcreate(int32 size);
TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0
MOVW size+0(FP), R3
SYSCALL $SYS_epoll_create
MOVW R3, ret+8(FP)
RET
// int32 runtime·epollcreate1(int32 flags);
TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0
MOVW flags+0(FP), R3
SYSCALL $SYS_epoll_create1
MOVW R3, ret+8(FP)
RET
// func epollctl(epfd, op, fd int32, ev *epollEvent) int
TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0
MOVW epfd+0(FP), R3
MOVW op+4(FP), R4
MOVW fd+8(FP), R5
MOVD ev+16(FP), R6
SYSCALL $SYS_epoll_ctl
MOVW R3, ret+24(FP)
RET
// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
TEXT runtime·epollwait(SB),NOSPLIT|NOFRAME,$0
MOVW epfd+0(FP), R3
MOVD ev+8(FP), R4
MOVW nev+16(FP), R5
MOVW timeout+20(FP), R6
SYSCALL $SYS_epoll_wait
MOVW R3, ret+24(FP)
RET
// void runtime·closeonexec(int32 fd);
TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R3 // fd
MOVD $2, R4 // F_SETFD
MOVD $1, R5 // FD_CLOEXEC
SYSCALL $SYS_fcntl
RET
// func sbrk0() uintptr
TEXT runtime·sbrk0(SB),NOSPLIT|NOFRAME,$0
// Implemented as brk(NULL).
MOVD $0, R3
SYSCALL $SYS_brk
MOVD R3, ret+0(FP)
RET
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