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go/src/runtime/sys_linux_arm64.s
Russ Cox 421220571d runtime, reflect: use correctly aligned stack frame sizes on arm64 
arm64 requires either no stack frame or a frame with a size that is 8 mod 16
(adding the saved LR will make it 16-aligned).

The cmd/internal/obj/arm64 has been silently aligning frames, but it led to
a terrible bug when the compiler and obj disagreed on the frame size,
and it's just generally confusing, so we're going to make misaligned frames
an error instead of something that is silently changed.

This CL prepares by updating assembly files.
Note that the changes in this CL are already being done silently by
cmd/internal/obj/arm64, so there is no semantic effect here,
just a clarity effect.

For #9880.

Change-Id: Ibd6928dc5fdcd896c2bacd0291bf26b364591e28
Reviewed-on: https://go-review.googlesource.com/12845
Reviewed-by: Austin Clements <austin@google.com>
2015-07-29 21:35:35 +00:00

448 lines
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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.
//
// System calls and other sys.stuff for arm64, Linux
//
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
#define AT_FDCWD -100
#define SYS_exit 93
#define SYS_read 63
#define SYS_write 64
#define SYS_openat 56
#define SYS_close 57
#define SYS_fcntl 25
#define SYS_gettimeofday 169
#define SYS_pselect6 72
#define SYS_mmap 222
#define SYS_munmap 215
#define SYS_setitimer 103
#define SYS_clone 220
#define SYS_sched_yield 124
#define SYS_rt_sigreturn 139
#define SYS_rt_sigaction 134
#define SYS_rt_sigprocmask 135
#define SYS_sigaltstack 132
#define SYS_getrlimit 163
#define SYS_madvise 233
#define SYS_mincore 232
#define SYS_getpid 172
#define SYS_gettid 178
#define SYS_kill 129
#define SYS_tkill 130
#define SYS_futex 98
#define SYS_sched_getaffinity 123
#define SYS_exit_group 94
#define SYS_epoll_create1 20
#define SYS_epoll_ctl 21
#define SYS_epoll_pwait 22
#define SYS_clock_gettime 113
TEXT runtime·exit(SB),NOSPLIT,$-8-4
MOVW code+0(FP), R0
MOVD $SYS_exit_group, R8
SVC
RET
TEXT runtime·exit1(SB),NOSPLIT,$-8-4
MOVW code+0(FP), R0
MOVD $SYS_exit, R8
SVC
RET
TEXT runtime·open(SB),NOSPLIT,$-8-20
MOVD $AT_FDCWD, R0
MOVD name+0(FP), R1
MOVW mode+8(FP), R2
MOVW perm+12(FP), R3
MOVD $SYS_openat, R8
SVC
CMN $4095, R0
BCC done
MOVW $-1, R0
done:
MOVW R0, ret+16(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT,$-8-12
MOVW fd+0(FP), R0
MOVD $SYS_close, R8
SVC
CMN $4095, R0
BCC done
MOVW $-1, R0
done:
MOVW R0, ret+8(FP)
RET
TEXT runtime·write(SB),NOSPLIT,$-8-28
MOVD fd+0(FP), R0
MOVD p+8(FP), R1
MOVW n+16(FP), R2
MOVD $SYS_write, R8
SVC
CMN $4095, R0
BCC done
MOVW $-1, R0
done:
MOVW R0, ret+24(FP)
RET
TEXT runtime·read(SB),NOSPLIT,$-8-28
MOVW fd+0(FP), R0
MOVD p+8(FP), R1
MOVW n+16(FP), R2
MOVD $SYS_read, R8
SVC
CMN $4095, R0
BCC done
MOVW $-1, R0
done:
MOVW R0, ret+24(FP)
RET
TEXT runtime·getrlimit(SB),NOSPLIT,$-8-20
MOVW kind+0(FP), R0
MOVD limit+8(FP), R1
MOVD $SYS_getrlimit, R8
SVC
MOVW R0, ret+16(FP)
RET
TEXT runtime·usleep(SB),NOSPLIT,$24-4
MOVWU usec+0(FP), R3
MOVD R3, R5
MOVW $1000000, R4
UDIV R4, R3
MOVD R3, 8(RSP)
MUL R3, R4
SUB R4, R5
MOVW $1000, R4
MUL R4, R5
MOVD R5, 16(RSP)
// pselect6(0, 0, 0, 0, &ts, 0)
MOVD $0, R0
MOVD R0, R1
MOVD R0, R2
MOVD R0, R3
ADD $8, RSP, R4
MOVD R0, R5
MOVD $SYS_pselect6, R8
SVC
RET
TEXT runtime·gettid(SB),NOSPLIT,$0-4
MOVD $SYS_gettid, R8
SVC
MOVW R0, ret+0(FP)
RET
TEXT runtime·raise(SB),NOSPLIT,$-8
MOVD $SYS_gettid, R8
SVC
MOVW R0, R0 // arg 1 tid
MOVW sig+0(FP), R1 // arg 2
MOVD $SYS_tkill, R8
SVC
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$-8
MOVD $SYS_getpid, R8
SVC
MOVW R0, R0 // arg 1 pid
MOVW sig+0(FP), R1 // arg 2
MOVD $SYS_kill, R8
SVC
RET
TEXT runtime·setitimer(SB),NOSPLIT,$-8-24
MOVW mode+0(FP), R0
MOVD new+8(FP), R1
MOVD old+16(FP), R2
MOVD $SYS_setitimer, R8
SVC
RET
TEXT runtime·mincore(SB),NOSPLIT,$-8-28
MOVD addr+0(FP), R0
MOVD n+8(FP), R1
MOVD dst+16(FP), R2
MOVD $SYS_mincore, R8
SVC
MOVW R0, ret+24(FP)
RET
// func now() (sec int64, nsec int32)
TEXT time·now(SB),NOSPLIT,$24-12
MOVD RSP, R0
MOVD $0, R1
MOVD $SYS_gettimeofday, R8
SVC
MOVD 0(RSP), R3 // sec
MOVD 8(RSP), R5 // usec
MOVD $1000, R4
MUL R4, R5
MOVD R3, sec+0(FP)
MOVW R5, nsec+8(FP)
RET
TEXT runtime·nanotime(SB),NOSPLIT,$24-8
MOVW $1, R0 // CLOCK_MONOTONIC
MOVD RSP, R1
MOVD $SYS_clock_gettime, R8
SVC
MOVD 0(RSP), R3 // sec
MOVD 8(RSP), R5 // nsec
// sec is in R3, nsec in R5
// return nsec in R3
MOVD $1000000000, R4
MUL R4, R3
ADD R5, R3
MOVD R3, ret+0(FP)
RET
TEXT runtime·rtsigprocmask(SB),NOSPLIT,$-8-28
MOVW sig+0(FP), R0
MOVD new+8(FP), R1
MOVD old+16(FP), R2
MOVW size+24(FP), R3
MOVD $SYS_rt_sigprocmask, R8
SVC
CMN $4095, R0
BCC done
MOVD $0, R0
MOVD R0, (R0) // crash
done:
RET
TEXT runtime·rt_sigaction(SB),NOSPLIT,$-8-36
MOVD sig+0(FP), R0
MOVD new+8(FP), R1
MOVD old+16(FP), R2
MOVD size+24(FP), R3
MOVD $SYS_rt_sigaction, R8
SVC
MOVW R0, ret+32(FP)
RET
TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
MOVW sig+8(FP), R0
MOVD info+16(FP), R1
MOVD ctx+24(FP), R2
MOVD fn+0(FP), R11
BL (R11)
RET
TEXT runtime·sigtramp(SB),NOSPLIT,$24
// 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, 8(RSP)
MOVBU runtime·iscgo(SB), R0
CMP $0, R0
BEQ 2(PC)
BL runtime·load_g(SB)
MOVD R1, 16(RSP)
MOVD R2, 24(RSP)
MOVD $runtime·sigtrampgo(SB), R0
BL (R0)
RET
TEXT runtime·mmap(SB),NOSPLIT,$-8
MOVD addr+0(FP), R0
MOVD n+8(FP), R1
MOVW prot+16(FP), R2
MOVW flags+20(FP), R3
MOVW fd+24(FP), R4
MOVW off+28(FP), R5
MOVD $SYS_mmap, R8
SVC
MOVD R0, ret+32(FP)
RET
TEXT runtime·munmap(SB),NOSPLIT,$-8
MOVD addr+0(FP), R0
MOVD n+8(FP), R1
MOVD $SYS_munmap, R8
SVC
CMN $4095, R0
BCC cool
MOVD R0, 0xf0(R0)
cool:
RET
TEXT runtime·madvise(SB),NOSPLIT,$-8
MOVD addr+0(FP), R0
MOVD n+8(FP), R1
MOVW flags+16(FP), R2
MOVD $SYS_madvise, R8
SVC
// ignore failure - maybe pages are locked
RET
// int64 futex(int32 *uaddr, int32 op, int32 val,
// struct timespec *timeout, int32 *uaddr2, int32 val2);
TEXT runtime·futex(SB),NOSPLIT,$-8
MOVD addr+0(FP), R0
MOVW op+8(FP), R1
MOVW val+12(FP), R2
MOVD ts+16(FP), R3
MOVD addr2+24(FP), R4
MOVW val3+32(FP), R5
MOVD $SYS_futex, R8
SVC
MOVW R0, ret+40(FP)
RET
// int64 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void));
TEXT runtime·clone(SB),NOSPLIT,$-8
MOVW flags+0(FP), R0
MOVD stk+8(FP), R1
// Copy mp, gp, fn off parent stack for use by child.
MOVD mm+16(FP), R10
MOVD gg+24(FP), R11
MOVD fn+32(FP), R12
MOVD R10, -8(R1)
MOVD R11, -16(R1)
MOVD R12, -24(R1)
MOVD $1234, R10
MOVD R10, -32(R1)
MOVD $SYS_clone, R8
SVC
// In parent, return.
CMP ZR, R0
BEQ child
MOVW R0, ret+40(FP)
RET
child:
// In child, on new stack.
MOVD -32(RSP), R10
MOVD $1234, R0
CMP R0, R10
BEQ good
MOVD $0, R0
MOVD R0, (R0) // crash
good:
// Initialize m->procid to Linux tid
MOVD $SYS_gettid, R8
SVC
MOVD -24(RSP), R12 // fn
MOVD -16(RSP), R11 // g
MOVD -8(RSP), R10 // m
CMP $0, R10
BEQ nog
CMP $0, R11
BEQ nog
MOVD R0, m_procid(R10)
// TODO: setup TLS.
// In child, set up new stack
MOVD R10, g_m(R11)
MOVD R11, g
//CALL runtime·stackcheck(SB)
nog:
// Call fn
MOVD R12, R0
BL (R0)
// It shouldn't return. If it does, exit that thread.
MOVW $111, R0
again:
MOVD $SYS_exit, R8
SVC
B again // keep exiting
TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
MOVD new+0(FP), R0
MOVD old+8(FP), R1
MOVD $SYS_sigaltstack, R8
SVC
CMN $4095, R0
BCC ok
MOVD $0, R0
MOVD R0, (R0) // crash
ok:
RET
TEXT runtime·osyield(SB),NOSPLIT,$-8
MOVD $SYS_sched_yield, R8
SVC
RET
TEXT runtime·sched_getaffinity(SB),NOSPLIT,$-8
MOVD pid+0(FP), R0
MOVD len+8(FP), R1
MOVD buf+16(FP), R2
MOVD $SYS_sched_getaffinity, R8
SVC
MOVW R0, ret+24(FP)
RET
// int32 runtime·epollcreate(int32 size);
TEXT runtime·epollcreate(SB),NOSPLIT,$-8
MOVW $0, R0
MOVD $SYS_epoll_create1, R8
SVC
MOVW R0, ret+8(FP)
RET
// int32 runtime·epollcreate1(int32 flags);
TEXT runtime·epollcreate1(SB),NOSPLIT,$-8
MOVW flags+0(FP), R0
MOVD $SYS_epoll_create1, R8
SVC
MOVW R0, ret+8(FP)
RET
// func epollctl(epfd, op, fd int32, ev *epollEvent) int
TEXT runtime·epollctl(SB),NOSPLIT,$-8
MOVW epfd+0(FP), R0
MOVW op+4(FP), R1
MOVW fd+8(FP), R2
MOVD ev+16(FP), R3
MOVD $SYS_epoll_ctl, R8
SVC
MOVW R0, ret+24(FP)
RET
// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
TEXT runtime·epollwait(SB),NOSPLIT,$-8
MOVW epfd+0(FP), R0
MOVD ev+8(FP), R1
MOVW nev+16(FP), R2
MOVW timeout+20(FP), R3
MOVD $0, R4
MOVD $SYS_epoll_pwait, R8
SVC
MOVW R0, ret+24(FP)
RET
// void runtime·closeonexec(int32 fd);
TEXT runtime·closeonexec(SB),NOSPLIT,$-8
MOVW fd+0(FP), R0 // fd
MOVD $2, R1 // F_SETFD
MOVD $1, R2 // FD_CLOEXEC
MOVD $SYS_fcntl, R8
SVC
RET
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