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sys_openbsd_arm64.s
// Copyright 2019 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 arm64, OpenBSD // System calls are implemented in libc/libpthread, this file // contains trampolines that convert from Go to C calling convention. // Some direct system call implementations currently remain. // #include "go_asm.h" #include "go_tls.h" #include "textflag.h" #include "cgo/abi_arm64.h" #define CLOCK_REALTIME $0 #define CLOCK_MONOTONIC $3 // mstart_stub is the first function executed on a new thread started by pthread_create. // It just does some low-level setup and then calls mstart. // Note: called with the C calling convention. TEXT runtime·mstart_stub(SB),NOSPLIT,$144 // R0 points to the m. // We are already on m's g0 stack. // Save callee-save registers. SAVE_R19_TO_R28(8) SAVE_F8_TO_F15(88) MOVD m_g0(R0), g BL runtime·save_g(SB) BL runtime·mstart(SB) // Restore callee-save registers. RESTORE_R19_TO_R28(8) RESTORE_F8_TO_F15(88) // Go is all done with this OS thread. // Tell pthread everything is ok (we never join with this thread, so // the value here doesn't really matter). MOVD $0, R0 RET TEXT runtime·sigfwd(SB),NOSPLIT,$0-32 MOVW sig+8(FP), R0 MOVD info+16(FP), R1 MOVD ctx+24(FP), R2 MOVD fn+0(FP), R11 BL (R11) // Alignment for ELF ABI? RET TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$192 // Save callee-save registers in the case of signal forwarding. // Please refer to https://golang.org/issue/31827 . SAVE_R19_TO_R28(8*4) SAVE_F8_TO_F15(8*14) // If called from an external code context, g will not be set. // Save R0, since runtime·load_g will clobber it. MOVW R0, 8(RSP) // signum BL runtime·load_g(SB) // Restore signum to R0. MOVW 8(RSP), R0 // R1 and R2 already contain info and ctx, respectively. BL runtime·sigtrampgo<ABIInternal>(SB) // Restore callee-save registers. RESTORE_R19_TO_R28(8*4) RESTORE_F8_TO_F15(8*14) RET // // These trampolines help convert from Go calling convention to C calling convention. // They should be called with asmcgocall. // A pointer to the arguments is passed in R0. // A single int32 result is returned in R0. // (For more results, make an args/results structure.) TEXT runtime·pthread_attr_init_trampoline(SB),NOSPLIT,$0 MOVD 0(R0), R0 // arg 1 - attr CALL libc_pthread_attr_init(SB) RET TEXT runtime·pthread_attr_destroy_trampoline(SB),NOSPLIT,$0 MOVD 0(R0), R0 // arg 1 - attr CALL libc_pthread_attr_destroy(SB) RET TEXT runtime·pthread_attr_getstacksize_trampoline(SB),NOSPLIT,$0 MOVD 8(R0), R1 // arg 2 - size MOVD 0(R0), R0 // arg 1 - attr CALL libc_pthread_attr_getstacksize(SB) RET TEXT runtime·pthread_attr_setdetachstate_trampoline(SB),NOSPLIT,$0 MOVD 8(R0), R1 // arg 2 - state MOVD 0(R0), R0 // arg 1 - attr CALL libc_pthread_attr_setdetachstate(SB) RET TEXT runtime·pthread_create_trampoline(SB),NOSPLIT,$0 MOVD 0(R0), R1 // arg 2 - attr MOVD 8(R0), R2 // arg 3 - start MOVD 16(R0), R3 // arg 4 - arg SUB $16, RSP MOVD RSP, R0 // arg 1 - &threadid (discard) CALL libc_pthread_create(SB) ADD $16, RSP RET TEXT runtime·thrkill_trampoline(SB),NOSPLIT,$0 MOVW 8(R0), R1 // arg 2 - signal MOVD $0, R2 // arg 3 - tcb MOVW 0(R0), R0 // arg 1 - tid CALL libc_thrkill(SB) RET TEXT runtime·thrsleep_trampoline(SB),NOSPLIT,$0 MOVW 8(R0), R1 // arg 2 - clock_id MOVD 16(R0), R2 // arg 3 - abstime MOVD 24(R0), R3 // arg 4 - lock MOVD 32(R0), R4 // arg 5 - abort MOVD 0(R0), R0 // arg 1 - id CALL libc_thrsleep(SB) RET TEXT runtime·thrwakeup_trampoline(SB),NOSPLIT,$0 MOVW 8(R0), R1 // arg 2 - count MOVD 0(R0), R0 // arg 1 - id CALL libc_thrwakeup(SB) RET TEXT runtime·exit_trampoline(SB),NOSPLIT,$0 MOVW 0(R0), R0 // arg 1 - status CALL libc_exit(SB) MOVD $0, R0 // crash on failure MOVD R0, (R0) RET TEXT runtime·getthrid_trampoline(SB),NOSPLIT,$0 MOVD R0, R19 // pointer to args CALL libc_getthrid(SB) MOVW R0, 0(R19) // return value RET TEXT runtime·raiseproc_trampoline(SB),NOSPLIT,$0 MOVD R0, R19 // pointer to args CALL libc_getpid(SB) // arg 1 - pid MOVW 0(R19), R1 // arg 2 - signal CALL libc_kill(SB) RET TEXT runtime·sched_yield_trampoline(SB),NOSPLIT,$0 CALL libc_sched_yield(SB) RET TEXT runtime·mmap_trampoline(SB),NOSPLIT,$0 MOVD R0, R19 // pointer to args MOVD 0(R19), R0 // arg 1 - addr MOVD 8(R19), R1 // arg 2 - len MOVW 16(R19), R2 // arg 3 - prot MOVW 20(R19), R3 // arg 4 - flags MOVW 24(R19), R4 // arg 5 - fid MOVW 28(R19), R5 // arg 6 - offset CALL libc_mmap(SB) MOVD $0, R1 CMP $-1, R0 BNE noerr CALL libc_errno(SB) MOVW (R0), R1 // errno MOVD $0, R0 noerr: MOVD R0, 32(R19) MOVD R1, 40(R19) RET TEXT runtime·munmap_trampoline(SB),NOSPLIT,$0 MOVD 8(R0), R1 // arg 2 - len MOVD 0(R0), R0 // arg 1 - addr CALL libc_munmap(SB) CMP $-1, R0 BNE 3(PC) MOVD $0, R0 // crash on failure MOVD R0, (R0) RET TEXT runtime·madvise_trampoline(SB), NOSPLIT, $0 MOVD 8(R0), R1 // arg 2 - len MOVW 16(R0), R2 // arg 3 - advice MOVD 0(R0), R0 // arg 1 - addr CALL libc_madvise(SB) // ignore failure - maybe pages are locked RET TEXT runtime·open_trampoline(SB),NOSPLIT,$0 MOVW 8(R0), R1 // arg 2 - flags MOVW 12(R0), R2 // arg 3 - mode MOVD 0(R0), R0 // arg 1 - path MOVD $0, R3 // varargs CALL libc_open(SB) RET TEXT runtime·close_trampoline(SB),NOSPLIT,$0 MOVD 0(R0), R0 // arg 1 - fd CALL libc_close(SB) RET TEXT runtime·read_trampoline(SB),NOSPLIT,$0 MOVD 8(R0), R1 // arg 2 - buf MOVW 16(R0), R2 // arg 3 - count MOVW 0(R0), R0 // arg 1 - fd CALL libc_read(SB) CMP $-1, R0 BNE noerr CALL libc_errno(SB) MOVW (R0), R0 // errno NEG R0, R0 // caller expects negative errno value noerr: RET TEXT runtime·write_trampoline(SB),NOSPLIT,$0 MOVD 8(R0), R1 // arg 2 - buf MOVW 16(R0), R2 // arg 3 - count MOVW 0(R0), R0 // arg 1 - fd CALL libc_write(SB) CMP $-1, R0 BNE noerr CALL libc_errno(SB) MOVW (R0), R0 // errno NEG R0, R0 // caller expects negative errno value noerr: RET TEXT runtime·pipe2_trampoline(SB),NOSPLIT,$0 MOVW 8(R0), R1 // arg 2 - flags MOVD 0(R0), R0 // arg 1 - filedes CALL libc_pipe2(SB) CMP $-1, R0 BNE noerr CALL libc_errno(SB) MOVW (R0), R0 // errno NEG R0, R0 // caller expects negative errno value noerr: RET TEXT runtime·setitimer_trampoline(SB),NOSPLIT,$0 MOVD 8(R0), R1 // arg 2 - new MOVD 16(R0), R2 // arg 3 - old MOVW 0(R0), R0 // arg 1 - which CALL libc_setitimer(SB) RET TEXT runtime·usleep_trampoline(SB),NOSPLIT,$0 MOVD 0(R0), R0 // arg 1 - usec CALL libc_usleep(SB) RET TEXT runtime·sysctl_trampoline(SB),NOSPLIT,$0 MOVW 8(R0), R1 // arg 2 - miblen MOVD 16(R0), R2 // arg 3 - out MOVD 24(R0), R3 // arg 4 - size MOVD 32(R0), R4 // arg 5 - dst MOVD 40(R0), R5 // arg 6 - ndst MOVD 0(R0), R0 // arg 1 - mib CALL libc_sysctl(SB) RET TEXT runtime·kqueue_trampoline(SB),NOSPLIT,$0 CALL libc_kqueue(SB) RET TEXT runtime·kevent_trampoline(SB),NOSPLIT,$0 MOVD 8(R0), R1 // arg 2 - keventt MOVW 16(R0), R2 // arg 3 - nch MOVD 24(R0), R3 // arg 4 - ev MOVW 32(R0), R4 // arg 5 - nev MOVD 40(R0), R5 // arg 6 - ts MOVW 0(R0), R0 // arg 1 - kq CALL libc_kevent(SB) CMP $-1, R0 BNE noerr CALL libc_errno(SB) MOVW (R0), R0 // errno NEG R0, R0 // caller expects negative errno value noerr: RET TEXT runtime·clock_gettime_trampoline(SB),NOSPLIT,$0 MOVD 8(R0), R1 // arg 2 - tp MOVD 0(R0), R0 // arg 1 - clock_id CALL libc_clock_gettime(SB) CMP $-1, R0 BNE noerr CALL libc_errno(SB) MOVW (R0), R0 // errno NEG R0, R0 // caller expects negative errno value noerr: RET TEXT runtime·fcntl_trampoline(SB),NOSPLIT,$0 MOVD R0, R19 MOVW 0(R19), R0 // arg 1 - fd MOVW 4(R19), R1 // arg 2 - cmd MOVW 8(R19), R2 // arg 3 - arg MOVD $0, R3 // vararg CALL libc_fcntl(SB) MOVD $0, R1 CMP $-1, R0 BNE noerr CALL libc_errno(SB) MOVW (R0), R1 MOVW $-1, R0 noerr: MOVW R0, 12(R19) MOVW R1, 16(R19) RET TEXT runtime·sigaction_trampoline(SB),NOSPLIT,$0 MOVD 8(R0), R1 // arg 2 - new MOVD 16(R0), R2 // arg 3 - old MOVW 0(R0), R0 // arg 1 - sig CALL libc_sigaction(SB) CMP $-1, R0 BNE 3(PC) MOVD $0, R0 // crash on syscall failure MOVD R0, (R0) RET TEXT runtime·sigprocmask_trampoline(SB),NOSPLIT,$0 MOVD 8(R0), R1 // arg 2 - new MOVD 16(R0), R2 // arg 3 - old MOVW 0(R0), R0 // arg 1 - how CALL libc_pthread_sigmask(SB) CMP $-1, R0 BNE 3(PC) MOVD $0, R0 // crash on syscall failure MOVD R0, (R0) RET TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$0 MOVD 8(R0), R1 // arg 2 - old MOVD 0(R0), R0 // arg 1 - new CALL libc_sigaltstack(SB) CMP $-1, R0 BNE 3(PC) MOVD $0, R0 // crash on syscall failure MOVD R0, (R0) RET // syscall calls a function in libc on behalf of the syscall package. // syscall takes a pointer to a struct like: // struct { // fn uintptr // a1 uintptr // a2 uintptr // a3 uintptr // r1 uintptr // r2 uintptr // err uintptr // } // syscall must be called on the g0 stack with the // C calling convention (use libcCall). // // syscall expects a 32-bit result and tests for 32-bit -1 // to decide there was an error. TEXT runtime·syscall(SB),NOSPLIT,$0 MOVD R0, R19 // pointer to args MOVD (0*8)(R19), R11 // fn MOVD (1*8)(R19), R0 // a1 MOVD (2*8)(R19), R1 // a2 MOVD (3*8)(R19), R2 // a3 MOVD $0, R3 // vararg CALL R11 MOVD R0, (4*8)(R19) // r1 MOVD R1, (5*8)(R19) // r2 // Standard libc functions return -1 on error // and set errno. CMPW $-1, R0 BNE ok // Get error code from libc. CALL libc_errno(SB) MOVW (R0), R0 MOVD R0, (6*8)(R19) // err ok: RET // syscallX calls a function in libc on behalf of the syscall package. // syscallX takes a pointer to a struct like: // struct { // fn uintptr // a1 uintptr // a2 uintptr // a3 uintptr // r1 uintptr // r2 uintptr // err uintptr // } // syscallX must be called on the g0 stack with the // C calling convention (use libcCall). // // syscallX is like syscall but expects a 64-bit result // and tests for 64-bit -1 to decide there was an error. TEXT runtime·syscallX(SB),NOSPLIT,$0 MOVD R0, R19 // pointer to args MOVD (0*8)(R19), R11 // fn MOVD (1*8)(R19), R0 // a1 MOVD (2*8)(R19), R1 // a2 MOVD (3*8)(R19), R2 // a3 MOVD $0, R3 // vararg CALL R11 MOVD R0, (4*8)(R19) // r1 MOVD R1, (5*8)(R19) // r2 // Standard libc functions return -1 on error // and set errno. CMP $-1, R0 BNE ok // Get error code from libc. CALL libc_errno(SB) MOVW (R0), R0 MOVD R0, (6*8)(R19) // err ok: RET // syscall6 calls a function in libc on behalf of the syscall package. // syscall6 takes a pointer to a struct like: // struct { // fn uintptr // a1 uintptr // a2 uintptr // a3 uintptr // a4 uintptr // a5 uintptr // a6 uintptr // r1 uintptr // r2 uintptr // err uintptr // } // syscall6 must be called on the g0 stack with the // C calling convention (use libcCall). // // syscall6 expects a 32-bit result and tests for 32-bit -1 // to decide there was an error. TEXT runtime·syscall6(SB),NOSPLIT,$0 MOVD R0, R19 // pointer to args MOVD (0*8)(R19), R11 // fn MOVD (1*8)(R19), R0 // a1 MOVD (2*8)(R19), R1 // a2 MOVD (3*8)(R19), R2 // a3 MOVD (4*8)(R19), R3 // a4 MOVD (5*8)(R19), R4 // a5 MOVD (6*8)(R19), R5 // a6 MOVD $0, R6 // vararg CALL R11 MOVD R0, (7*8)(R19) // r1 MOVD R1, (8*8)(R19) // r2 // Standard libc functions return -1 on error // and set errno. CMPW $-1, R0 BNE ok // Get error code from libc. CALL libc_errno(SB) MOVW (R0), R0 MOVD R0, (9*8)(R19) // err ok: RET // syscall6X calls a function in libc on behalf of the syscall package. // syscall6X takes a pointer to a struct like: // struct { // fn uintptr // a1 uintptr // a2 uintptr // a3 uintptr // a4 uintptr // a5 uintptr // a6 uintptr // r1 uintptr // r2 uintptr // err uintptr // } // syscall6X must be called on the g0 stack with the // C calling convention (use libcCall). // // syscall6X is like syscall6 but expects a 64-bit result // and tests for 64-bit -1 to decide there was an error. TEXT runtime·syscall6X(SB),NOSPLIT,$0 MOVD R0, R19 // pointer to args MOVD (0*8)(R19), R11 // fn MOVD (1*8)(R19), R0 // a1 MOVD (2*8)(R19), R1 // a2 MOVD (3*8)(R19), R2 // a3 MOVD (4*8)(R19), R3 // a4 MOVD (5*8)(R19), R4 // a5 MOVD (6*8)(R19), R5 // a6 MOVD $0, R6 // vararg CALL R11 MOVD R0, (7*8)(R19) // r1 MOVD R1, (8*8)(R19) // r2 // Standard libc functions return -1 on error // and set errno. CMP $-1, R0 BNE ok // Get error code from libc. CALL libc_errno(SB) MOVW (R0), R0 MOVD R0, (9*8)(R19) // err ok: RET // syscall10 calls a function in libc on behalf of the syscall package. // syscall10 takes a pointer to a struct like: // struct { // fn uintptr // a1 uintptr // a2 uintptr // a3 uintptr // a4 uintptr // a5 uintptr // a6 uintptr // a7 uintptr // a8 uintptr // a9 uintptr // a10 uintptr // r1 uintptr // r2 uintptr // err uintptr // } // syscall10 must be called on the g0 stack with the // C calling convention (use libcCall). TEXT runtime·syscall10(SB),NOSPLIT,$0 MOVD R0, R19 // pointer to args MOVD (0*8)(R19), R11 // fn MOVD (1*8)(R19), R0 // a1 MOVD (2*8)(R19), R1 // a2 MOVD (3*8)(R19), R2 // a3 MOVD (4*8)(R19), R3 // a4 MOVD (5*8)(R19), R4 // a5 MOVD (6*8)(R19), R5 // a6 MOVD (7*8)(R19), R6 // a7 MOVD (8*8)(R19), R7 // a8 MOVD (9*8)(R19), R8 // a9 MOVD (10*8)(R19), R9 // a10 MOVD $0, R10 // vararg CALL R11 MOVD R0, (11*8)(R19) // r1 MOVD R1, (12*8)(R19) // r2 // Standard libc functions return -1 on error // and set errno. CMPW $-1, R0 BNE ok // Get error code from libc. CALL libc_errno(SB) MOVW (R0), R0 MOVD R0, (13*8)(R19) // err ok: RET // syscall10X calls a function in libc on behalf of the syscall package. // syscall10X takes a pointer to a struct like: // struct { // fn uintptr // a1 uintptr // a2 uintptr // a3 uintptr // a4 uintptr // a5 uintptr // a6 uintptr // a7 uintptr // a8 uintptr // a9 uintptr // a10 uintptr // r1 uintptr // r2 uintptr // err uintptr // } // syscall10X must be called on the g0 stack with the // C calling convention (use libcCall). // // syscall10X is like syscall10 but expects a 64-bit result // and tests for 64-bit -1 to decide there was an error. TEXT runtime·syscall10X(SB),NOSPLIT,$0 MOVD R0, R19 // pointer to args MOVD (0*8)(R19), R11 // fn MOVD (1*8)(R19), R0 // a1 MOVD (2*8)(R19), R1 // a2 MOVD (3*8)(R19), R2 // a3 MOVD (4*8)(R19), R3 // a4 MOVD (5*8)(R19), R4 // a5 MOVD (6*8)(R19), R5 // a6 MOVD (7*8)(R19), R6 // a7 MOVD (8*8)(R19), R7 // a8 MOVD (9*8)(R19), R8 // a9 MOVD (10*8)(R19), R9 // a10 MOVD $0, R10 // vararg CALL R11 MOVD R0, (11*8)(R19) // r1 MOVD R1, (12*8)(R19) // r2 // Standard libc functions return -1 on error // and set errno. CMP $-1, R0 BNE ok // Get error code from libc. CALL libc_errno(SB) MOVW (R0), R0 MOVD R0, (13*8)(R19) // err ok: RET TEXT runtime·issetugid_trampoline(SB),NOSPLIT,$0 MOVD R0, R19 // pointer to args CALL libc_issetugid(SB) MOVW R0, 0(R19) // return value RET
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