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sys_linux_s390x.s
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sys_linux_s390x.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.
// System calls and other system stuff for Linux s390x; see
// /usr/include/asm/unistd.h for the syscall number definitions.
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.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_mmap 90
#define SYS_munmap 91
#define SYS_setitimer 104
#define SYS_clone 120
#define SYS_sched_yield 158
#define SYS_nanosleep 162
#define SYS_rt_sigreturn 173
#define SYS_rt_sigaction 174
#define SYS_rt_sigprocmask 175
#define SYS_sigaltstack 186
#define SYS_madvise 219
#define SYS_mincore 218
#define SYS_gettid 236
#define SYS_futex 238
#define SYS_sched_getaffinity 240
#define SYS_tgkill 241
#define SYS_exit_group 248
#define SYS_epoll_create 249
#define SYS_epoll_ctl 250
#define SYS_epoll_wait 251
#define SYS_clock_gettime 260
#define SYS_epoll_create1 327
TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
MOVW code+0(FP), R2
MOVW $SYS_exit_group, R1
SYSCALL
RET
// func exitThread(wait *uint32)
TEXT runtime·exitThread(SB),NOSPLIT|NOFRAME,$0-8
MOVD wait+0(FP), R1
// We're done using the stack.
MOVW $0, R2
MOVW R2, (R1)
MOVW $0, R2 // exit code
MOVW $SYS_exit, R1
SYSCALL
JMP 0(PC)
TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0-20
MOVD name+0(FP), R2
MOVW mode+8(FP), R3
MOVW perm+12(FP), R4
MOVW $SYS_open, R1
SYSCALL
MOVD $-4095, R3
CMPUBLT R2, R3, 2(PC)
MOVW $-1, R2
MOVW R2, ret+16(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12
MOVW fd+0(FP), R2
MOVW $SYS_close, R1
SYSCALL
MOVD $-4095, R3
CMPUBLT R2, R3, 2(PC)
MOVW $-1, R2
MOVW R2, ret+8(FP)
RET
TEXT runtime·write(SB),NOSPLIT|NOFRAME,$0-28
MOVD fd+0(FP), R2
MOVD p+8(FP), R3
MOVW n+16(FP), R4
MOVW $SYS_write, R1
SYSCALL
MOVD $-4095, R3
CMPUBLT R2, R3, 2(PC)
MOVW $-1, R2
MOVW R2, ret+24(FP)
RET
TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0-28
MOVW fd+0(FP), R2
MOVD p+8(FP), R3
MOVW n+16(FP), R4
MOVW $SYS_read, R1
SYSCALL
MOVD $-4095, R3
CMPUBLT R2, R3, 2(PC)
MOVW $-1, R2
MOVW R2, ret+24(FP)
RET
TEXT runtime·usleep(SB),NOSPLIT,$16-4
MOVW usec+0(FP), R2
MOVD R2, R4
MOVW $1000000, R3
DIVD R3, R2
MOVD R2, 8(R15)
MOVW $1000, R3
MULLD R2, R3
SUB R3, R4
MOVD R4, 16(R15)
// nanosleep(&ts, 0)
ADD $8, R15, R2
MOVW $0, R3
MOVW $SYS_nanosleep, R1
SYSCALL
RET
TEXT runtime·gettid(SB),NOSPLIT,$0-4
MOVW $SYS_gettid, R1
SYSCALL
MOVW R2, ret+0(FP)
RET
TEXT runtime·raise(SB),NOSPLIT|NOFRAME,$0
MOVW $SYS_getpid, R1
SYSCALL
MOVW R2, R10
MOVW $SYS_gettid, R1
SYSCALL
MOVW R2, R3 // arg 2 tid
MOVW R10, R2 // arg 1 pid
MOVW sig+0(FP), R4 // arg 2
MOVW $SYS_tgkill, R1
SYSCALL
RET
TEXT runtime·raiseproc(SB),NOSPLIT|NOFRAME,$0
MOVW $SYS_getpid, R1
SYSCALL
MOVW R2, R2 // arg 1 pid
MOVW sig+0(FP), R3 // arg 2
MOVW $SYS_kill, R1
SYSCALL
RET
TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0-24
MOVW mode+0(FP), R2
MOVD new+8(FP), R3
MOVD old+16(FP), R4
MOVW $SYS_setitimer, R1
SYSCALL
RET
TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28
MOVD addr+0(FP), R2
MOVD n+8(FP), R3
MOVD dst+16(FP), R4
MOVW $SYS_mincore, R1
SYSCALL
MOVW R2, ret+24(FP)
RET
// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB),NOSPLIT,$16
MOVW $0, R2 // CLOCK_REALTIME
MOVD $tp-16(SP), R3
MOVW $SYS_clock_gettime, R1
SYSCALL
LMG tp-16(SP), R2, R3
// sec is in R2, nsec in R3
MOVD R2, sec+0(FP)
MOVW R3, nsec+8(FP)
RET
TEXT runtime·nanotime(SB),NOSPLIT,$16
MOVW $1, R2 // CLOCK_MONOTONIC
MOVD $tp-16(SP), R3
MOVW $SYS_clock_gettime, R1
SYSCALL
LMG tp-16(SP), R2, R3
// sec is in R2, nsec in R3
// return nsec in R2
MULLD $1000000000, R2
ADD R3, R2
MOVD R2, ret+0(FP)
RET
TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28
MOVW how+0(FP), R2
MOVD new+8(FP), R3
MOVD old+16(FP), R4
MOVW size+24(FP), R5
MOVW $SYS_rt_sigprocmask, R1
SYSCALL
MOVD $-4095, R3
CMPUBLT R2, R3, 2(PC)
MOVD R0, 0(R0) // crash
RET
TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36
MOVD sig+0(FP), R2
MOVD new+8(FP), R3
MOVD old+16(FP), R4
MOVD size+24(FP), R5
MOVW $SYS_rt_sigaction, R1
SYSCALL
MOVW R2, ret+32(FP)
RET
TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
MOVW sig+8(FP), R2
MOVD info+16(FP), R3
MOVD ctx+24(FP), R4
MOVD fn+0(FP), R5
BL R5
RET
TEXT runtime·sigtramp(SB),NOSPLIT,$64
// initialize essential registers (just in case)
XOR R0, R0
// this might be called in external code context,
// where g is not set.
MOVB runtime·iscgo(SB), R6
CMPBEQ R6, $0, 2(PC)
BL runtime·load_g(SB)
MOVW R2, 8(R15)
MOVD R3, 16(R15)
MOVD R4, 24(R15)
MOVD $runtime·sigtrampgo(SB), R5
BL R5
RET
TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
BR runtime·sigtramp(SB)
// func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) unsafe.Pointer
TEXT runtime·mmap(SB),NOSPLIT,$48-48
MOVD addr+0(FP), R2
MOVD n+8(FP), R3
MOVW prot+16(FP), R4
MOVW flags+20(FP), R5
MOVW fd+24(FP), R6
MOVWZ off+28(FP), R7
// s390x uses old_mmap, so the arguments need to be placed into
// a struct and a pointer to the struct passed to mmap.
MOVD R2, addr-48(SP)
MOVD R3, n-40(SP)
MOVD R4, prot-32(SP)
MOVD R5, flags-24(SP)
MOVD R6, fd-16(SP)
MOVD R7, off-8(SP)
MOVD $addr-48(SP), R2
MOVW $SYS_mmap, R1
SYSCALL
MOVD $-4095, R3
CMPUBLT R2, R3, ok
NEG R2
MOVD $0, p+32(FP)
MOVD R2, err+40(FP)
RET
ok:
MOVD R2, p+32(FP)
MOVD $0, err+40(FP)
RET
TEXT runtime·munmap(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R2
MOVD n+8(FP), R3
MOVW $SYS_munmap, R1
SYSCALL
MOVD $-4095, R3
CMPUBLT R2, R3, 2(PC)
MOVD R0, 0(R0) // crash
RET
TEXT runtime·madvise(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R2
MOVD n+8(FP), R3
MOVW flags+16(FP), R4
MOVW $SYS_madvise, R1
SYSCALL
MOVW R2, ret+24(FP)
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), R2
MOVW op+8(FP), R3
MOVW val+12(FP), R4
MOVD ts+16(FP), R5
MOVD addr2+24(FP), R6
MOVW val3+32(FP), R7
MOVW $SYS_futex, R1
SYSCALL
MOVW R2, ret+40(FP)
RET
// int32 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), R2
// 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), R9
MOVD R7, -8(R2)
MOVD R8, -16(R2)
MOVD R9, -24(R2)
MOVD $1234, R7
MOVD R7, -32(R2)
SYSCALL $SYS_clone
// In parent, return.
CMPBEQ R2, $0, 3(PC)
MOVW R2, ret+40(FP)
RET
// In child, on new stack.
// initialize essential registers
XOR R0, R0
MOVD -32(R15), R7
CMP R7, $1234
BEQ 2(PC)
MOVD R0, 0(R0)
// Initialize m->procid to Linux tid
SYSCALL $SYS_gettid
MOVD -24(R15), R9 // fn
MOVD -16(R15), R8 // g
MOVD -8(R15), R7 // m
CMPBEQ R7, $0, nog
CMP R8, $0
BEQ nog
MOVD R2, m_procid(R7)
// In child, set up new stack
MOVD R7, g_m(R8)
MOVD R8, g
//CALL runtime·stackcheck(SB)
nog:
// Call fn
BL R9
// It shouldn't return. If it does, exit that thread.
MOVW $111, R2
MOVW $SYS_exit, R1
SYSCALL
BR -2(PC) // keep exiting
TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
MOVD new+0(FP), R2
MOVD old+8(FP), R3
MOVW $SYS_sigaltstack, R1
SYSCALL
MOVD $-4095, R3
CMPUBLT R2, R3, 2(PC)
MOVD R0, 0(R0) // crash
RET
TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
MOVW $SYS_sched_yield, R1
SYSCALL
RET
TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
MOVD pid+0(FP), R2
MOVD len+8(FP), R3
MOVD buf+16(FP), R4
MOVW $SYS_sched_getaffinity, R1
SYSCALL
MOVW R2, ret+24(FP)
RET
// int32 runtime·epollcreate(int32 size);
TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0
MOVW size+0(FP), R2
MOVW $SYS_epoll_create, R1
SYSCALL
MOVW R2, ret+8(FP)
RET
// int32 runtime·epollcreate1(int32 flags);
TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0
MOVW flags+0(FP), R2
MOVW $SYS_epoll_create1, R1
SYSCALL
MOVW R2, ret+8(FP)
RET
// func epollctl(epfd, op, fd int32, ev *epollEvent) int
TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0
MOVW epfd+0(FP), R2
MOVW op+4(FP), R3
MOVW fd+8(FP), R4
MOVD ev+16(FP), R5
MOVW $SYS_epoll_ctl, R1
SYSCALL
MOVW R2, 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), R2
MOVD ev+8(FP), R3
MOVW nev+16(FP), R4
MOVW timeout+20(FP), R5
MOVW $SYS_epoll_wait, R1
SYSCALL
MOVW R2, ret+24(FP)
RET
// void runtime·closeonexec(int32 fd);
TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R2 // fd
MOVD $2, R3 // F_SETFD
MOVD $1, R4 // FD_CLOEXEC
MOVW $SYS_fcntl, R1
SYSCALL
RET
// func sbrk0() uintptr
TEXT runtime·sbrk0(SB),NOSPLIT|NOFRAME,$0-8
// Implemented as brk(NULL).
MOVD $0, R2
MOVW $SYS_brk, R1
SYSCALL
MOVD R2, ret+0(FP)
RET