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Diffstat (limited to 'src/runtime/sys_linux_s390x.s')
-rw-r--r-- | src/runtime/sys_linux_s390x.s | 606 |
1 files changed, 606 insertions, 0 deletions
diff --git a/src/runtime/sys_linux_s390x.s b/src/runtime/sys_linux_s390x.s new file mode 100644 index 0000000..adf5612 --- /dev/null +++ b/src/runtime/sys_linux_s390x.s @@ -0,0 +1,606 @@ +// 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 |