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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_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_timer_create 254 #define SYS_timer_settime 255 #define SYS_timer_delete 258 #define SYS_clock_gettime 260 #define SYS_pipe2 325 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 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,$32-12 MOVW $0, R2 // CLOCK_REALTIME MOVD R15, R7 // Backup stack pointer MOVD g_m(g), R6 //m MOVD runtime·vdsoClockgettimeSym(SB), R9 // Check for VDSO availability CMPBEQ R9, $0, fallback MOVD m_vdsoPC(R6), R4 MOVD R4, 16(R15) MOVD m_vdsoSP(R6), R4 MOVD R4, 24(R15) MOVD R14, R8 // Backup return address MOVD $sec+0(FP), R4 // return parameter caller MOVD R8, m_vdsoPC(R6) MOVD R4, m_vdsoSP(R6) MOVD m_curg(R6), R5 CMP g, R5 BNE noswitch MOVD m_g0(R6), R4 MOVD (g_sched+gobuf_sp)(R4), R15 // Set SP to g0 stack noswitch: SUB $16, R15 // reserve 2x 8 bytes for parameters MOVD $~7, R4 // align to 8 bytes because of gcc ABI AND R4, R15 MOVD R15, R3 // R15 needs to be in R3 as expected by kernel_clock_gettime MOVB runtime·iscgo(SB),R12 CMPBNE R12, $0, nosaveg MOVD m_gsignal(R6), R12 // g.m.gsignal CMPBEQ R12, $0, nosaveg CMPBEQ g, R12, nosaveg MOVD (g_stack+stack_lo)(R12), R12 // g.m.gsignal.stack.lo MOVD g, (R12) BL R9 // to vdso lookup MOVD $0, (R12) JMP finish nosaveg: BL R9 // to vdso lookup finish: MOVD 0(R15), R3 // sec MOVD 8(R15), R5 // nsec MOVD R7, R15 // Restore SP // Restore vdsoPC, vdsoSP // We don't worry about being signaled between the two stores. // If we are not in a signal handler, we'll restore vdsoSP to 0, // and no one will care about vdsoPC. If we are in a signal handler, // we cannot receive another signal. MOVD 24(R15), R12 MOVD R12, m_vdsoSP(R6) MOVD 16(R15), R12 MOVD R12, m_vdsoPC(R6) return: // sec is in R3, nsec in R5 // return nsec in R3 MOVD R3, sec+0(FP) MOVW R5, nsec+8(FP) RET // Syscall fallback fallback: 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,$32-8 MOVW $1, R2 // CLOCK_MONOTONIC MOVD R15, R7 // Backup stack pointer MOVD g_m(g), R6 //m MOVD runtime·vdsoClockgettimeSym(SB), R9 // Check for VDSO availability CMPBEQ R9, $0, fallback MOVD m_vdsoPC(R6), R4 MOVD R4, 16(R15) MOVD m_vdsoSP(R6), R4 MOVD R4, 24(R15) MOVD R14, R8 // Backup return address MOVD $ret+0(FP), R4 // caller's SP MOVD R8, m_vdsoPC(R6) MOVD R4, m_vdsoSP(R6) MOVD m_curg(R6), R5 CMP g, R5 BNE noswitch MOVD m_g0(R6), R4 MOVD (g_sched+gobuf_sp)(R4), R15 // Set SP to g0 stack noswitch: SUB $16, R15 // reserve 2x 8 bytes for parameters MOVD $~7, R4 // align to 8 bytes because of gcc ABI AND R4, R15 MOVD R15, R3 // R15 needs to be in R3 as expected by kernel_clock_gettime MOVB runtime·iscgo(SB),R12 CMPBNE R12, $0, nosaveg MOVD m_gsignal(R6), R12 // g.m.gsignal CMPBEQ R12, $0, nosaveg CMPBEQ g, R12, nosaveg MOVD (g_stack+stack_lo)(R12), R12 // g.m.gsignal.stack.lo MOVD g, (R12) BL R9 // to vdso lookup MOVD $0, (R12) JMP finish nosaveg: BL R9 // to vdso lookup finish: MOVD 0(R15), R3 // sec MOVD 8(R15), R5 // nsec MOVD R7, R15 // Restore SP // Restore vdsoPC, vdsoSP // We don't worry about being signaled between the two stores. // If we are not in a signal handler, we'll restore vdsoSP to 0, // and no one will care about vdsoPC. If we are in a signal handler, // we cannot receive another signal. MOVD 24(R15), R12 MOVD R12, m_vdsoSP(R6) MOVD 16(R15), R12 MOVD R12, m_vdsoPC(R6) return: // sec is in R3, nsec in R5 // return nsec in R3 MULLD $1000000000, R3 ADD R5, R3 MOVD R3, ret+0(FP) RET // Syscall fallback fallback: MOVD $tp-16(SP), R3 MOVD $SYS_clock_gettime, R1 SYSCALL LMG tp-16(SP), R2, R3 MOVD R3, R5 MOVD R2, R3 JMP return 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|TOPFRAME,$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 // 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