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sys_linux_mipsx.s
494 lines (434 loc) · 9.46 KB
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sys_linux_mipsx.s
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// Copyright 2016 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 mips mipsle
//
// System calls and other sys.stuff for mips, Linux
//
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
#define SYS_exit 4001
#define SYS_read 4003
#define SYS_write 4004
#define SYS_open 4005
#define SYS_close 4006
#define SYS_getpid 4020
#define SYS_kill 4037
#define SYS_brk 4045
#define SYS_fcntl 4055
#define SYS_mmap 4090
#define SYS_munmap 4091
#define SYS_setitimer 4104
#define SYS_clone 4120
#define SYS_sched_yield 4162
#define SYS_nanosleep 4166
#define SYS_rt_sigreturn 4193
#define SYS_rt_sigaction 4194
#define SYS_rt_sigprocmask 4195
#define SYS_sigaltstack 4206
#define SYS_madvise 4218
#define SYS_mincore 4217
#define SYS_gettid 4222
#define SYS_futex 4238
#define SYS_sched_getaffinity 4240
#define SYS_exit_group 4246
#define SYS_epoll_create 4248
#define SYS_epoll_ctl 4249
#define SYS_epoll_wait 4250
#define SYS_clock_gettime 4263
#define SYS_tgkill 4266
#define SYS_epoll_create1 4326
TEXT runtime·exit(SB),NOSPLIT,$0-4
MOVW code+0(FP), R4
MOVW $SYS_exit_group, R2
SYSCALL
UNDEF
RET
// func exitThread(wait *uint32)
TEXT runtime·exitThread(SB),NOSPLIT,$0-4
MOVW wait+0(FP), R1
// We're done using the stack.
MOVW $0, R2
SYNC
MOVW R2, (R1)
SYNC
MOVW $0, R4 // exit code
MOVW $SYS_exit, R2
SYSCALL
UNDEF
JMP 0(PC)
TEXT runtime·open(SB),NOSPLIT,$0-16
MOVW name+0(FP), R4
MOVW mode+4(FP), R5
MOVW perm+8(FP), R6
MOVW $SYS_open, R2
SYSCALL
BEQ R7, 2(PC)
MOVW $-1, R2
MOVW R2, ret+12(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT,$0-8
MOVW fd+0(FP), R4
MOVW $SYS_close, R2
SYSCALL
BEQ R7, 2(PC)
MOVW $-1, R2
MOVW R2, ret+4(FP)
RET
TEXT runtime·write(SB),NOSPLIT,$0-16
MOVW fd+0(FP), R4
MOVW p+4(FP), R5
MOVW n+8(FP), R6
MOVW $SYS_write, R2
SYSCALL
BEQ R7, 2(PC)
MOVW $-1, R2
MOVW R2, ret+12(FP)
RET
TEXT runtime·read(SB),NOSPLIT,$0-16
MOVW fd+0(FP), R4
MOVW p+4(FP), R5
MOVW n+8(FP), R6
MOVW $SYS_read, R2
SYSCALL
BEQ R7, 2(PC)
MOVW $-1, R2
MOVW R2, ret+12(FP)
RET
TEXT runtime·usleep(SB),NOSPLIT,$28-4
MOVW usec+0(FP), R3
MOVW R3, R5
MOVW $1000000, R4
DIVU R4, R3
MOVW LO, R3
MOVW R3, 24(R29)
MOVW $1000, R4
MULU R3, R4
MOVW LO, R4
SUBU R4, R5
MOVW R5, 28(R29)
// nanosleep(&ts, 0)
ADDU $24, R29, R4
MOVW $0, R5
MOVW $SYS_nanosleep, R2
SYSCALL
RET
TEXT runtime·gettid(SB),NOSPLIT,$0-4
MOVW $SYS_gettid, R2
SYSCALL
MOVW R2, ret+0(FP)
RET
TEXT runtime·raise(SB),NOSPLIT,$0-4
MOVW $SYS_getpid, R2
SYSCALL
MOVW R2, R16
MOVW $SYS_gettid, R2
SYSCALL
MOVW R2, R5 // arg 2 tid
MOVW R16, R4 // arg 1 pid
MOVW sig+0(FP), R6 // arg 3
MOVW $SYS_tgkill, R2
SYSCALL
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$0
MOVW $SYS_getpid, R2
SYSCALL
MOVW R2, R4 // arg 1 pid
MOVW sig+0(FP), R5 // arg 2
MOVW $SYS_kill, R2
SYSCALL
RET
TEXT runtime·setitimer(SB),NOSPLIT,$0-12
MOVW mode+0(FP), R4
MOVW new+4(FP), R5
MOVW old+8(FP), R6
MOVW $SYS_setitimer, R2
SYSCALL
RET
TEXT runtime·mincore(SB),NOSPLIT,$0-16
MOVW addr+0(FP), R4
MOVW n+4(FP), R5
MOVW dst+8(FP), R6
MOVW $SYS_mincore, R2
SYSCALL
SUBU R2, R0, R2 // caller expects negative errno
MOVW R2, ret+12(FP)
RET
// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB),NOSPLIT,$8-12
MOVW $0, R4 // CLOCK_REALTIME
MOVW $4(R29), R5
MOVW $SYS_clock_gettime, R2
SYSCALL
MOVW 4(R29), R3 // sec
MOVW 8(R29), R5 // nsec
#ifdef GOARCH_mips
MOVW R3, sec_lo+4(FP)
MOVW R0, sec_hi+0(FP)
#else
MOVW R3, sec_lo+0(FP)
MOVW R0, sec_hi+4(FP)
#endif
MOVW R5, nsec+8(FP)
RET
TEXT runtime·nanotime(SB),NOSPLIT,$8-8
MOVW $1, R4 // CLOCK_MONOTONIC
MOVW $4(R29), R5
MOVW $SYS_clock_gettime, R2
SYSCALL
MOVW 4(R29), R3 // sec
MOVW 8(R29), R5 // nsec
// sec is in R3, nsec in R5
// return nsec in R3
MOVW $1000000000, R4
MULU R4, R3
MOVW LO, R3
ADDU R5, R3
SGTU R5, R3, R4
#ifdef GOARCH_mips
MOVW R3, ret_lo+4(FP)
#else
MOVW R3, ret_lo+0(FP)
#endif
MOVW HI, R3
ADDU R4, R3
#ifdef GOARCH_mips
MOVW R3, ret_hi+0(FP)
#else
MOVW R3, ret_hi+4(FP)
#endif
RET
TEXT runtime·rtsigprocmask(SB),NOSPLIT,$0-16
MOVW how+0(FP), R4
MOVW new+4(FP), R5
MOVW old+8(FP), R6
MOVW size+12(FP), R7
MOVW $SYS_rt_sigprocmask, R2
SYSCALL
BEQ R7, 2(PC)
UNDEF // crash
RET
TEXT runtime·rt_sigaction(SB),NOSPLIT,$0-20
MOVW sig+0(FP), R4
MOVW new+4(FP), R5
MOVW old+8(FP), R6
MOVW size+12(FP), R7
MOVW $SYS_rt_sigaction, R2
SYSCALL
BEQ R7, 2(PC)
SUBU R2, R0, R2 // caller expects negative errno
MOVW R2, ret+16(FP)
RET
TEXT runtime·sigfwd(SB),NOSPLIT,$0-16
MOVW sig+4(FP), R4
MOVW info+8(FP), R5
MOVW ctx+12(FP), R6
MOVW fn+0(FP), R25
MOVW R29, R22
SUBU $16, R29
AND $~7, R29 // shadow space for 4 args aligned to 8 bytes as per O32 ABI
JAL (R25)
MOVW R22, R29
RET
TEXT runtime·sigtramp(SB),NOSPLIT,$12
// this might be called in external code context,
// where g is not set.
MOVB runtime·iscgo(SB), R1
BEQ R1, 2(PC)
JAL runtime·load_g(SB)
MOVW R4, 4(R29)
MOVW R5, 8(R29)
MOVW R6, 12(R29)
MOVW $runtime·sigtrampgo(SB), R1
JAL (R1)
RET
TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
JMP runtime·sigtramp(SB)
TEXT runtime·mmap(SB),NOSPLIT,$20-32
MOVW addr+0(FP), R4
MOVW n+4(FP), R5
MOVW prot+8(FP), R6
MOVW flags+12(FP), R7
MOVW fd+16(FP), R8
MOVW off+20(FP), R9
MOVW R8, 16(R29)
MOVW R9, 20(R29)
MOVW $SYS_mmap, R2
SYSCALL
BEQ R7, ok
MOVW $0, p+24(FP)
MOVW R2, err+28(FP)
RET
ok:
MOVW R2, p+24(FP)
MOVW $0, err+28(FP)
RET
TEXT runtime·munmap(SB),NOSPLIT,$0-8
MOVW addr+0(FP), R4
MOVW n+4(FP), R5
MOVW $SYS_munmap, R2
SYSCALL
BEQ R7, 2(PC)
UNDEF // crash
RET
TEXT runtime·madvise(SB),NOSPLIT,$0-16
MOVW addr+0(FP), R4
MOVW n+4(FP), R5
MOVW flags+8(FP), R6
MOVW $SYS_madvise, R2
SYSCALL
MOVW R2, ret+12(FP)
RET
// int32 futex(int32 *uaddr, int32 op, int32 val, struct timespec *timeout, int32 *uaddr2, int32 val2);
TEXT runtime·futex(SB),NOSPLIT,$20-28
MOVW addr+0(FP), R4
MOVW op+4(FP), R5
MOVW val+8(FP), R6
MOVW ts+12(FP), R7
MOVW addr2+16(FP), R8
MOVW val3+20(FP), R9
MOVW R8, 16(R29)
MOVW R9, 20(R29)
MOVW $SYS_futex, R2
SYSCALL
BEQ R7, 2(PC)
SUBU R2, R0, R2 // caller expects negative errno
MOVW R2, ret+24(FP)
RET
// int32 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void));
TEXT runtime·clone(SB),NOSPLIT|NOFRAME,$0-24
MOVW flags+0(FP), R4
MOVW stk+4(FP), R5
MOVW R0, R6 // ptid
MOVW R0, R7 // tls
// O32 syscall handler unconditionally copies arguments 5-8 from stack,
// even for syscalls with less than 8 arguments. Reserve 32 bytes of new
// stack so that any syscall invoked immediately in the new thread won't fail.
ADD $-32, R5
// Copy mp, gp, fn off parent stack for use by child.
MOVW mp+8(FP), R16
MOVW gp+12(FP), R17
MOVW fn+16(FP), R18
MOVW $1234, R1
MOVW R16, 0(R5)
MOVW R17, 4(R5)
MOVW R18, 8(R5)
MOVW R1, 12(R5)
MOVW $SYS_clone, R2
SYSCALL
BEQ R7, 2(PC)
SUBU R2, R0, R2 // caller expects negative errno
// In parent, return.
BEQ R2, 3(PC)
MOVW R2, ret+20(FP)
RET
// In child, on new stack.
// Check that SP is as we expect
MOVW 12(R29), R16
MOVW $1234, R1
BEQ R16, R1, 2(PC)
MOVW (R0), R0
// Initialize m->procid to Linux tid
MOVW $SYS_gettid, R2
SYSCALL
MOVW 0(R29), R16 // m
MOVW 4(R29), R17 // g
MOVW 8(R29), R18 // fn
BEQ R16, nog
BEQ R17, nog
MOVW R2, m_procid(R16)
// In child, set up new stack
MOVW R16, g_m(R17)
MOVW R17, g
// TODO(mips32): doesn't have runtime·stackcheck(SB)
nog:
// Call fn
ADDU $32, R29
JAL (R18)
// It shouldn't return. If it does, exit that thread.
ADDU $-32, R29
MOVW $0xf4, R4
MOVW $SYS_exit, R2
SYSCALL
UNDEF
TEXT runtime·sigaltstack(SB),NOSPLIT,$0
MOVW new+0(FP), R4
MOVW old+4(FP), R5
MOVW $SYS_sigaltstack, R2
SYSCALL
BEQ R7, 2(PC)
UNDEF // crash
RET
TEXT runtime·osyield(SB),NOSPLIT,$0
MOVW $SYS_sched_yield, R2
SYSCALL
RET
TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0-16
MOVW pid+0(FP), R4
MOVW len+4(FP), R5
MOVW buf+8(FP), R6
MOVW $SYS_sched_getaffinity, R2
SYSCALL
BEQ R7, 2(PC)
SUBU R2, R0, R2 // caller expects negative errno
MOVW R2, ret+12(FP)
RET
// int32 runtime·epollcreate(int32 size);
TEXT runtime·epollcreate(SB),NOSPLIT,$0-8
MOVW size+0(FP), R4
MOVW $SYS_epoll_create, R2
SYSCALL
BEQ R7, 2(PC)
SUBU R2, R0, R2 // caller expects negative errno
MOVW R2, ret+4(FP)
RET
// int32 runtime·epollcreate1(int32 flags);
TEXT runtime·epollcreate1(SB),NOSPLIT,$0-8
MOVW flags+0(FP), R4
MOVW $SYS_epoll_create1, R2
SYSCALL
BEQ R7, 2(PC)
SUBU R2, R0, R2 // caller expects negative errno
MOVW R2, ret+4(FP)
RET
// func epollctl(epfd, op, fd int32, ev *epollEvent) int
TEXT runtime·epollctl(SB),NOSPLIT,$0-20
MOVW epfd+0(FP), R4
MOVW op+4(FP), R5
MOVW fd+8(FP), R6
MOVW ev+12(FP), R7
MOVW $SYS_epoll_ctl, R2
SYSCALL
SUBU R2, R0, R2 // caller expects negative errno
MOVW R2, ret+16(FP)
RET
// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
TEXT runtime·epollwait(SB),NOSPLIT,$0-20
MOVW epfd+0(FP), R4
MOVW ev+4(FP), R5
MOVW nev+8(FP), R6
MOVW timeout+12(FP), R7
MOVW $SYS_epoll_wait, R2
SYSCALL
BEQ R7, 2(PC)
SUBU R2, R0, R2 // caller expects negative errno
MOVW R2, ret+16(FP)
RET
// void runtime·closeonexec(int32 fd);
TEXT runtime·closeonexec(SB),NOSPLIT,$0-4
MOVW fd+0(FP), R4 // fd
MOVW $2, R5 // F_SETFD
MOVW $1, R6 // FD_CLOEXEC
MOVW $SYS_fcntl, R2
SYSCALL
RET
// func sbrk0() uintptr
TEXT runtime·sbrk0(SB),NOSPLIT,$0-4
// Implemented as brk(NULL).
MOVW $0, R4
MOVW $SYS_brk, R2
SYSCALL
MOVW R2, ret+0(FP)
RET