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-rw-r--r--src/runtime/sys_linux_s390x.s537
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diff --git a/src/runtime/sys_linux_s390x.s b/src/runtime/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_pipe 42
+#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_timer_create 254
+#define SYS_timer_settime 255
+#define SYS_timer_delete 258
+#define SYS_clock_gettime 260
+#define SYS_pipe2 325
+#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 *atomic.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·write1(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
+ 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
+ MOVW R2, ret+24(FP)
+ RET
+
+// func pipe() (r, w int32, errno int32)
+TEXT runtime·pipe(SB),NOSPLIT|NOFRAME,$0-12
+ MOVD $r+0(FP), R2
+ MOVW $SYS_pipe, R1
+ SYSCALL
+ MOVW R2, errno+8(FP)
+ RET
+
+// func pipe2() (r, w int32, errno int32)
+TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20
+ MOVD $r+8(FP), R2
+ MOVW flags+0(FP), R3
+ MOVW $SYS_pipe2, R1
+ SYSCALL
+ MOVW R2, errno+16(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 ·getpid(SB),NOSPLIT|NOFRAME,$0-8
+ MOVW $SYS_getpid, R1
+ SYSCALL
+ MOVD R2, ret+0(FP)
+ RET
+
+TEXT ·tgkill(SB),NOSPLIT|NOFRAME,$0-24
+ MOVD tgid+0(FP), R2
+ MOVD tid+8(FP), R3
+ MOVD sig+16(FP), R4
+ MOVW $SYS_tgkill, 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·timer_create(SB),NOSPLIT|NOFRAME,$0-28
+ MOVW clockid+0(FP), R2
+ MOVD sevp+8(FP), R3
+ MOVD timerid+16(FP), R4
+ MOVW $SYS_timer_create, R1
+ SYSCALL
+ MOVW R2, ret+24(FP)
+ RET
+
+TEXT runtime·timer_settime(SB),NOSPLIT|NOFRAME,$0-28
+ MOVW timerid+0(FP), R2
+ MOVW flags+4(FP), R3
+ MOVD new+8(FP), R4
+ MOVD old+16(FP), R5
+ MOVW $SYS_timer_settime, R1
+ SYSCALL
+ MOVW R2, ret+24(FP)
+ RET
+
+TEXT runtime·timer_delete(SB),NOSPLIT|NOFRAME,$0-12
+ MOVW timerid+0(FP), R2
+ MOVW $SYS_timer_delete, R1
+ SYSCALL
+ MOVW R2, ret+8(FP)
+ 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·nanotime1(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·sigreturn(SB),NOSPLIT,$0-0
+ 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 runtime·setNonblock(int32 fd)
+TEXT runtime·setNonblock(SB),NOSPLIT|NOFRAME,$0-4
+ MOVW fd+0(FP), R2 // fd
+ MOVD $3, R3 // F_GETFL
+ XOR R4, R4
+ MOVW $SYS_fcntl, R1
+ SYSCALL
+ MOVD $0x800, R4 // O_NONBLOCK
+ OR R2, R4
+ MOVW fd+0(FP), R2 // fd
+ MOVD $4, R3 // F_SETFL
+ 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
+
+TEXT runtime·access(SB),$0-20
+ MOVD $0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go
+ MOVW R0, ret+16(FP)
+ RET
+
+TEXT runtime·connect(SB),$0-28
+ MOVD $0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go
+ MOVW R0, ret+24(FP)
+ RET
+
+TEXT runtime·socket(SB),$0-20
+ MOVD $0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go
+ MOVW R0, ret+16(FP)
+ RET
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