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文件: /usr/share/go-1.23/src/runtime/sys_linux_loong64.s
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// Copyright 2022 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 sys.stuff for loong64, Linux // #include "go_asm.h" #include "go_tls.h" #include "textflag.h" #include "cgo/abi_loong64.h" #define AT_FDCWD -100 #define CLOCK_REALTIME 0 #define CLOCK_MONOTONIC 1 #define SYS_exit 93 #define SYS_read 63 #define SYS_write 64 #define SYS_close 57 #define SYS_getpid 172 #define SYS_kill 129 #define SYS_mmap 222 #define SYS_munmap 215 #define SYS_setitimer 103 #define SYS_clone 220 #define SYS_nanosleep 101 #define SYS_sched_yield 124 #define SYS_rt_sigreturn 139 #define SYS_rt_sigaction 134 #define SYS_rt_sigprocmask 135 #define SYS_sigaltstack 132 #define SYS_madvise 233 #define SYS_mincore 232 #define SYS_gettid 178 #define SYS_futex 98 #define SYS_sched_getaffinity 123 #define SYS_exit_group 94 #define SYS_tgkill 131 #define SYS_openat 56 #define SYS_clock_gettime 113 #define SYS_brk 214 #define SYS_pipe2 59 #define SYS_timer_create 107 #define SYS_timer_settime 110 #define SYS_timer_delete 111 // func exit(code int32) TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4 MOVW code+0(FP), R4 MOVV $SYS_exit_group, R11 SYSCALL RET // func exitThread(wait *atomic.Uint32) TEXT runtime·exitThread(SB),NOSPLIT|NOFRAME,$0-8 MOVV wait+0(FP), R19 // We're done using the stack. MOVW $0, R11 DBAR MOVW R11, (R19) DBAR MOVW $0, R4 // exit code MOVV $SYS_exit, R11 SYSCALL JMP 0(PC) // func open(name *byte, mode, perm int32) int32 TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0-20 MOVW $AT_FDCWD, R4 // AT_FDCWD, so this acts like open MOVV name+0(FP), R5 MOVW mode+8(FP), R6 MOVW perm+12(FP), R7 MOVV $SYS_openat, R11 SYSCALL MOVW $-4096, R5 BGEU R5, R4, 2(PC) MOVW $-1, R4 MOVW R4, ret+16(FP) RET // func closefd(fd int32) int32 TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12 MOVW fd+0(FP), R4 MOVV $SYS_close, R11 SYSCALL MOVW $-4096, R5 BGEU R5, R4, 2(PC) MOVW $-1, R4 MOVW R4, ret+8(FP) RET // func write1(fd uintptr, p unsafe.Pointer, n int32) int32 TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0-28 MOVV fd+0(FP), R4 MOVV p+8(FP), R5 MOVW n+16(FP), R6 MOVV $SYS_write, R11 SYSCALL MOVW R4, ret+24(FP) RET // func read(fd int32, p unsafe.Pointer, n int32) int32 TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0-28 MOVW fd+0(FP), R4 MOVV p+8(FP), R5 MOVW n+16(FP), R6 MOVV $SYS_read, R11 SYSCALL MOVW R4, ret+24(FP) RET // func pipe2(flags int32) (r, w int32, errno int32) TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20 MOVV $r+8(FP), R4 MOVW flags+0(FP), R5 MOVV $SYS_pipe2, R11 SYSCALL MOVW R4, errno+16(FP) RET // func usleep(usec uint32) TEXT runtime·usleep(SB),NOSPLIT,$16-4 MOVWU usec+0(FP), R7 MOVV $1000, R6 MULVU R6, R7, R7 MOVV $1000000000, R6 DIVVU R6, R7, R5 // ts->tv_sec REMVU R6, R7, R4 // ts->tv_nsec MOVV R5, 8(R3) MOVV R4, 16(R3) // nanosleep(&ts, 0) ADDV $8, R3, R4 MOVV R0, R5 MOVV $SYS_nanosleep, R11 SYSCALL RET // func gettid() uint32 TEXT runtime·gettid(SB),NOSPLIT,$0-4 MOVV $SYS_gettid, R11 SYSCALL MOVW R4, ret+0(FP) RET // func raise(sig uint32) TEXT runtime·raise(SB),NOSPLIT|NOFRAME,$0 MOVV $SYS_getpid, R11 SYSCALL MOVW R4, R23 MOVV $SYS_gettid, R11 SYSCALL MOVW R4, R5 // arg 2 tid MOVW R23, R4 // arg 1 pid MOVW sig+0(FP), R6 // arg 3 MOVV $SYS_tgkill, R11 SYSCALL RET // func raiseproc(sig uint32) TEXT runtime·raiseproc(SB),NOSPLIT|NOFRAME,$0 MOVV $SYS_getpid, R11 SYSCALL //MOVW R4, R4 // arg 1 pid MOVW sig+0(FP), R5 // arg 2 MOVV $SYS_kill, R11 SYSCALL RET // func getpid() int TEXT ·getpid(SB),NOSPLIT|NOFRAME,$0-8 MOVV $SYS_getpid, R11 SYSCALL MOVV R4, ret+0(FP) RET // func tgkill(tgid, tid, sig int) TEXT ·tgkill(SB),NOSPLIT|NOFRAME,$0-24 MOVV tgid+0(FP), R4 MOVV tid+8(FP), R5 MOVV sig+16(FP), R6 MOVV $SYS_tgkill, R11 SYSCALL RET // func setitimer(mode int32, new, old *itimerval) TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0-24 MOVW mode+0(FP), R4 MOVV new+8(FP), R5 MOVV old+16(FP), R6 MOVV $SYS_setitimer, R11 SYSCALL RET // func timer_create(clockid int32, sevp *sigevent, timerid *int32) int32 TEXT runtime·timer_create(SB),NOSPLIT,$0-28 MOVW clockid+0(FP), R4 MOVV sevp+8(FP), R5 MOVV timerid+16(FP), R6 MOVV $SYS_timer_create, R11 SYSCALL MOVW R4, ret+24(FP) RET // func timer_settime(timerid int32, flags int32, new, old *itimerspec) int32 TEXT runtime·timer_settime(SB),NOSPLIT,$0-28 MOVW timerid+0(FP), R4 MOVW flags+4(FP), R5 MOVV new+8(FP), R6 MOVV old+16(FP), R7 MOVV $SYS_timer_settime, R11 SYSCALL MOVW R4, ret+24(FP) RET // func timer_delete(timerid int32) int32 TEXT runtime·timer_delete(SB),NOSPLIT,$0-12 MOVW timerid+0(FP), R4 MOVV $SYS_timer_delete, R11 SYSCALL MOVW R4, ret+8(FP) RET // func mincore(addr unsafe.Pointer, n uintptr, dst *byte) int32 TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28 MOVV addr+0(FP), R4 MOVV n+8(FP), R5 MOVV dst+16(FP), R6 MOVV $SYS_mincore, R11 SYSCALL MOVW R4, ret+24(FP) RET // func walltime() (sec int64, nsec int32) TEXT runtime·walltime(SB),NOSPLIT,$24-12 MOVV R3, R23 // R23 is unchanged by C code MOVV R3, R25 MOVV g_m(g), R24 // R24 = m // Set vdsoPC and vdsoSP for SIGPROF traceback. // Save the old values on stack and restore them on exit, // so this function is reentrant. MOVV m_vdsoPC(R24), R11 MOVV m_vdsoSP(R24), R7 MOVV R11, 8(R3) MOVV R7, 16(R3) MOVV $ret-8(FP), R11 // caller's SP MOVV R1, m_vdsoPC(R24) MOVV R11, m_vdsoSP(R24) MOVV m_curg(R24), R4 MOVV g, R5 BNE R4, R5, noswitch MOVV m_g0(R24), R4 MOVV (g_sched+gobuf_sp)(R4), R25 // Set SP to g0 stack noswitch: SUBV $16, R25 AND $~15, R25 // Align for C code MOVV R25, R3 MOVW $CLOCK_REALTIME, R4 MOVV $0(R3), R5 MOVV runtime·vdsoClockgettimeSym(SB), R20 BEQ R20, fallback // Store g on gsignal's stack, see sys_linux_arm64.s for detail MOVBU runtime·iscgo(SB), R25 BNE R25, nosaveg MOVV m_gsignal(R24), R25 // g.m.gsignal BEQ R25, nosaveg BEQ g, R25, nosaveg MOVV (g_stack+stack_lo)(R25), R25 // g.m.gsignal.stack.lo MOVV g, (R25) JAL (R20) MOVV R0, (R25) JMP finish nosaveg: JAL (R20) finish: MOVV 0(R3), R7 // sec MOVV 8(R3), R5 // nsec MOVV R23, R3 // 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. MOVV 16(R3), R25 MOVV R25, m_vdsoSP(R24) MOVV 8(R3), R25 MOVV R25, m_vdsoPC(R24) MOVV R7, sec+0(FP) MOVW R5, nsec+8(FP) RET fallback: MOVV $SYS_clock_gettime, R11 SYSCALL JMP finish // func nanotime1() int64 TEXT runtime·nanotime1(SB),NOSPLIT,$16-8 MOVV R3, R23 // R23 is unchanged by C code MOVV R3, R25 MOVV g_m(g), R24 // R24 = m // Set vdsoPC and vdsoSP for SIGPROF traceback. // Save the old values on stack and restore them on exit, // so this function is reentrant. MOVV m_vdsoPC(R24), R11 MOVV m_vdsoSP(R24), R7 MOVV R11, 8(R3) MOVV R7, 16(R3) MOVV $ret-8(FP), R11 // caller's SP MOVV R1, m_vdsoPC(R24) MOVV R11, m_vdsoSP(R24) MOVV m_curg(R24), R4 MOVV g, R5 BNE R4, R5, noswitch MOVV m_g0(R24), R4 MOVV (g_sched+gobuf_sp)(R4), R25 // Set SP to g0 stack noswitch: SUBV $16, R25 AND $~15, R25 // Align for C code MOVV R25, R3 MOVW $CLOCK_MONOTONIC, R4 MOVV $0(R3), R5 MOVV runtime·vdsoClockgettimeSym(SB), R20 BEQ R20, fallback // Store g on gsignal's stack, see sys_linux_arm64.s for detail MOVBU runtime·iscgo(SB), R25 BNE R25, nosaveg MOVV m_gsignal(R24), R25 // g.m.gsignal BEQ R25, nosaveg BEQ g, R25, nosaveg MOVV (g_stack+stack_lo)(R25), R25 // g.m.gsignal.stack.lo MOVV g, (R25) JAL (R20) MOVV R0, (R25) JMP finish nosaveg: JAL (R20) finish: MOVV 0(R3), R7 // sec MOVV 8(R3), R5 // nsec MOVV R23, R3 // 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. MOVV 16(R3), R25 MOVV R25, m_vdsoSP(R24) MOVV 8(R3), R25 MOVV R25, m_vdsoPC(R24) // sec is in R7, nsec in R5 // return nsec in R7 MOVV $1000000000, R4 MULVU R4, R7, R7 ADDVU R5, R7 MOVV R7, ret+0(FP) RET fallback: MOVV $SYS_clock_gettime, R11 SYSCALL JMP finish // func rtsigprocmask(how int32, new, old *sigset, size int32) TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28 MOVW how+0(FP), R4 MOVV new+8(FP), R5 MOVV old+16(FP), R6 MOVW size+24(FP), R7 MOVV $SYS_rt_sigprocmask, R11 SYSCALL MOVW $-4096, R5 BGEU R5, R4, 2(PC) MOVV R0, 0xf1(R0) // crash RET // func rt_sigaction(sig uintptr, new, old *sigactiont, size uintptr) int32 TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36 MOVV sig+0(FP), R4 MOVV new+8(FP), R5 MOVV old+16(FP), R6 MOVV size+24(FP), R7 MOVV $SYS_rt_sigaction, R11 SYSCALL MOVW R4, ret+32(FP) RET // func sigfwd(fn uintptr, sig uint32, info *siginfo, ctx unsafe.Pointer) TEXT runtime·sigfwd(SB),NOSPLIT,$0-32 MOVW sig+8(FP), R4 MOVV info+16(FP), R5 MOVV ctx+24(FP), R6 MOVV fn+0(FP), R20 JAL (R20) RET // func sigtramp(signo, ureg, ctxt unsafe.Pointer) TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$168 MOVW R4, (1*8)(R3) MOVV R5, (2*8)(R3) MOVV R6, (3*8)(R3) // Save callee-save registers in the case of signal forwarding. // Please refer to https://golang.org/issue/31827 . SAVE_R22_TO_R31((4*8)) SAVE_F24_TO_F31((14*8)) // this might be called in external code context, // where g is not set. MOVB runtime·iscgo(SB), R4 BEQ R4, 2(PC) JAL runtime·load_g(SB) MOVV $runtime·sigtrampgo(SB), R4 JAL (R4) // Restore callee-save registers. RESTORE_R22_TO_R31((4*8)) RESTORE_F24_TO_F31((14*8)) RET // func cgoSigtramp() TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0 JMP runtime·sigtramp(SB) // func sysMmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) (p unsafe.Pointer, err int) TEXT runtime·sysMmap(SB),NOSPLIT|NOFRAME,$0 MOVV addr+0(FP), R4 MOVV n+8(FP), R5 MOVW prot+16(FP), R6 MOVW flags+20(FP), R7 MOVW fd+24(FP), R8 MOVW off+28(FP), R9 MOVV $SYS_mmap, R11 SYSCALL MOVW $-4096, R5 BGEU R5, R4, ok MOVV $0, p+32(FP) SUBVU R4, R0, R4 MOVV R4, err+40(FP) RET ok: MOVV R4, p+32(FP) MOVV $0, err+40(FP) RET // Call the function stored in _cgo_mmap using the GCC calling convention. // This must be called on the system stack. // func callCgoMmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) uintptr TEXT runtime·callCgoMmap(SB),NOSPLIT,$0 MOVV addr+0(FP), R4 MOVV n+8(FP), R5 MOVW prot+16(FP), R6 MOVW flags+20(FP), R7 MOVW fd+24(FP), R8 MOVW off+28(FP), R9 MOVV _cgo_mmap(SB), R13 SUBV $16, R3 // reserve 16 bytes for sp-8 where fp may be saved. JAL (R13) ADDV $16, R3 MOVV R4, ret+32(FP) RET // func sysMunmap(addr unsafe.Pointer, n uintptr) TEXT runtime·sysMunmap(SB),NOSPLIT|NOFRAME,$0 MOVV addr+0(FP), R4 MOVV n+8(FP), R5 MOVV $SYS_munmap, R11 SYSCALL MOVW $-4096, R5 BGEU R5, R4, 2(PC) MOVV R0, 0xf3(R0) // crash RET // Call the function stored in _cgo_munmap using the GCC calling convention. // This must be called on the system stack. // func callCgoMunmap(addr unsafe.Pointer, n uintptr) TEXT runtime·callCgoMunmap(SB),NOSPLIT,$0 MOVV addr+0(FP), R4 MOVV n+8(FP), R5 MOVV _cgo_munmap(SB), R13 SUBV $16, R3 // reserve 16 bytes for sp-8 where fp may be saved. JAL (R13) ADDV $16, R3 RET // func madvise(addr unsafe.Pointer, n uintptr, flags int32) TEXT runtime·madvise(SB),NOSPLIT|NOFRAME,$0 MOVV addr+0(FP), R4 MOVV n+8(FP), R5 MOVW flags+16(FP), R6 MOVV $SYS_madvise, R11 SYSCALL MOVW R4, ret+24(FP) RET // func futex(addr unsafe.Pointer, op int32, val uint32, ts, addr2 unsafe.Pointer, val3 uint32) int32 TEXT runtime·futex(SB),NOSPLIT|NOFRAME,$0 MOVV addr+0(FP), R4 MOVW op+8(FP), R5 MOVW val+12(FP), R6 MOVV ts+16(FP), R7 MOVV addr2+24(FP), R8 MOVW val3+32(FP), R9 MOVV $SYS_futex, R11 SYSCALL MOVW R4, ret+40(FP) RET // int64 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void)); TEXT runtime·clone(SB),NOSPLIT|NOFRAME,$0 MOVW flags+0(FP), R4 MOVV stk+8(FP), R5 // Copy mp, gp, fn off parent stack for use by child. // Careful: Linux system call clobbers ???. MOVV mp+16(FP), R23 MOVV gp+24(FP), R24 MOVV fn+32(FP), R25 MOVV R23, -8(R5) MOVV R24, -16(R5) MOVV R25, -24(R5) MOVV $1234, R23 MOVV R23, -32(R5) MOVV $SYS_clone, R11 SYSCALL // In parent, return. BEQ R4, 3(PC) MOVW R4, ret+40(FP) RET // In child, on new stack. MOVV -32(R3), R23 MOVV $1234, R19 BEQ R23, R19, 2(PC) MOVV R0, 0(R0) // Initialize m->procid to Linux tid MOVV $SYS_gettid, R11 SYSCALL MOVV -24(R3), R25 // fn MOVV -16(R3), R24 // g MOVV -8(R3), R23 // m BEQ R23, nog BEQ R24, nog MOVV R4, m_procid(R23) // TODO: setup TLS. // In child, set up new stack MOVV R23, g_m(R24) MOVV R24, g //CALL runtime·stackcheck(SB) nog: // Call fn JAL (R25) // It shouldn't return. If it does, exit that thread. MOVW $111, R4 MOVV $SYS_exit, R11 SYSCALL JMP -3(PC) // keep exiting // func sigaltstack(new, old *stackt) TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0 MOVV new+0(FP), R4 MOVV old+8(FP), R5 MOVV $SYS_sigaltstack, R11 SYSCALL MOVW $-4096, R5 BGEU R5, R4, 2(PC) MOVV R0, 0xf1(R0) // crash RET // func osyield() TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0 MOVV $SYS_sched_yield, R11 SYSCALL RET // func sched_getaffinity(pid, len uintptr, buf *uintptr) int32 TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0 MOVV pid+0(FP), R4 MOVV len+8(FP), R5 MOVV buf+16(FP), R6 MOVV $SYS_sched_getaffinity, R11 SYSCALL MOVW R4, ret+24(FP) RET // func sbrk0() uintptr TEXT runtime·sbrk0(SB),NOSPLIT|NOFRAME,$0-8 // Implemented as brk(NULL). MOVV $0, R4 MOVV $SYS_brk, R11 SYSCALL MOVV R4, ret+0(FP) RET TEXT runtime·access(SB),$0-20 MOVV R0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go MOVW R0, ret+16(FP) // for vet RET TEXT runtime·connect(SB),$0-28 MOVV R0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go MOVW R0, ret+24(FP) // for vet RET TEXT runtime·socket(SB),$0-20 MOVV R0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go MOVW R0, ret+16(FP) // for vet RET
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