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Editing: sys_openbsd_riscv64.s
// Copyright 2023 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 riscv64, OpenBSD // System calls are implemented in libc/libpthread, this file // contains trampolines that convert from Go to C calling convention. // #include "go_asm.h" #include "go_tls.h" #include "textflag.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,$200 // X10 points to the m. // We are already on m's g0 stack. // Save callee-save registers (X8, X9, X18..X27, F8, F9, F18..F27) MOV X8, (1*8)(X2) MOV X9, (2*8)(X2) MOV X18, (3*8)(X2) MOV X19, (4*8)(X2) MOV X20, (5*8)(X2) MOV X21, (6*8)(X2) MOV X22, (7*8)(X2) MOV X23, (8*8)(X2) MOV X24, (9*8)(X2) MOV X25, (10*8)(X2) MOV X26, (11*8)(X2) MOV g, (12*8)(X2) MOVF F8, (13*8)(X2) MOVF F9, (14*8)(X2) MOVF F18, (15*8)(X2) MOVF F19, (16*8)(X2) MOVF F20, (17*8)(X2) MOVF F21, (18*8)(X2) MOVF F22, (19*8)(X2) MOVF F23, (20*8)(X2) MOVF F24, (21*8)(X2) MOVF F25, (22*8)(X2) MOVF F26, (23*8)(X2) MOVF F27, (24*8)(X2) MOV m_g0(X10), g CALL runtime·save_g(SB) CALL runtime·mstart(SB) // Restore callee-save registers. MOV (1*8)(X2), X8 MOV (2*8)(X2), X9 MOV (3*8)(X2), X18 MOV (4*8)(X2), X19 MOV (5*8)(X2), X20 MOV (6*8)(X2), X21 MOV (7*8)(X2), X22 MOV (8*8)(X2), X23 MOV (9*8)(X2), X24 MOV (10*8)(X2), X25 MOV (11*8)(X2), X26 MOV (12*8)(X2), g MOVF (13*8)(X2), F8 MOVF (14*8)(X2), F9 MOVF (15*8)(X2), F18 MOVF (16*8)(X2), F19 MOVF (17*8)(X2), F20 MOVF (18*8)(X2), F21 MOVF (19*8)(X2), F22 MOVF (20*8)(X2), F23 MOVF (21*8)(X2), F24 MOVF (22*8)(X2), F25 MOVF (23*8)(X2), F26 MOVF (24*8)(X2), F27 // 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). MOV $0, X10 RET TEXT runtime·sigfwd(SB),NOSPLIT,$0-32 MOVW sig+8(FP), X10 MOV info+16(FP), X11 MOV ctx+24(FP), X12 MOV fn+0(FP), X5 JALR X1, X5 RET TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$224 // Save callee-save registers (X8, X9, X18..X27, F8, F9, F18..F27) MOV X8, (4*8)(X2) MOV X9, (5*8)(X2) MOV X18, (6*8)(X2) MOV X19, (7*8)(X2) MOV X20, (8*8)(X2) MOV X21, (9*8)(X2) MOV X22, (10*8)(X2) MOV X23, (11*8)(X2) MOV X24, (12*8)(X2) MOV X25, (13*8)(X2) MOV X26, (14*8)(X2) MOV g, (15*8)(X2) MOVF F8, (16*8)(X2) MOVF F9, (17*8)(X2) MOVF F18, (18*8)(X2) MOVF F19, (19*8)(X2) MOVF F20, (20*8)(X2) MOVF F21, (21*8)(X2) MOVF F22, (22*8)(X2) MOVF F23, (23*8)(X2) MOVF F24, (24*8)(X2) MOVF F25, (25*8)(X2) MOVF F26, (26*8)(X2) MOVF F27, (27*8)(X2) // this might be called in external code context, // where g is not set. CALL runtime·load_g(SB) MOVW X10, 8(X2) MOV X11, 16(X2) MOV X12, 24(X2) MOV $runtime·sigtrampgo(SB), X5 JALR X1, X5 // Restore callee-save registers. MOV (4*8)(X2), X8 MOV (5*8)(X2), X9 MOV (6*8)(X2), X18 MOV (7*8)(X2), X19 MOV (8*8)(X2), X20 MOV (9*8)(X2), X21 MOV (10*8)(X2), X22 MOV (11*8)(X2), X23 MOV (12*8)(X2), X24 MOV (13*8)(X2), X25 MOV (14*8)(X2), X26 MOV (15*8)(X2), g MOVF (16*8)(X2), F8 MOVF (17*8)(X2), F9 MOVF (18*8)(X2), F18 MOVF (19*8)(X2), F19 MOVF (20*8)(X2), F20 MOVF (21*8)(X2), F21 MOVF (22*8)(X2), F22 MOVF (23*8)(X2), F23 MOVF (24*8)(X2), F24 MOVF (25*8)(X2), F25 MOVF (26*8)(X2), F26 MOVF (27*8)(X2), F27 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,$8 MOV 0(X10), X10 // arg 1 - attr CALL libc_pthread_attr_init(SB) RET TEXT runtime·pthread_attr_destroy_trampoline(SB),NOSPLIT,$8 MOV 0(X10), X10 // arg 1 - attr CALL libc_pthread_attr_destroy(SB) RET TEXT runtime·pthread_attr_getstacksize_trampoline(SB),NOSPLIT,$8 MOV 8(X10), X11 // arg 2 - size MOV 0(X10), X10 // arg 1 - attr CALL libc_pthread_attr_getstacksize(SB) RET TEXT runtime·pthread_attr_setdetachstate_trampoline(SB),NOSPLIT,$8 MOV 8(X10), X11 // arg 2 - state MOV 0(X10), X10 // arg 1 - attr CALL libc_pthread_attr_setdetachstate(SB) RET TEXT runtime·pthread_create_trampoline(SB),NOSPLIT,$8 MOV 0(X10), X11 // arg 2 - attr MOV 8(X10), X12 // arg 3 - start MOV 16(X10), X13 // arg 4 - arg ADD $-16, X2 MOV X2, X10 // arg 1 - &threadid (discard) CALL libc_pthread_create(SB) ADD $16, X2 RET TEXT runtime·thrkill_trampoline(SB),NOSPLIT,$8 MOV 8(X10), X11 // arg 2 - signal MOV $0, X12 // arg 3 - tcb MOVW 0(X10), X10 // arg 1 - tid CALL libc_thrkill(SB) RET TEXT runtime·thrsleep_trampoline(SB),NOSPLIT,$8 MOVW 8(X10), X11 // arg 2 - clock_id MOV 16(X10), X12 // arg 3 - abstime MOV 24(X10), X13 // arg 4 - lock MOV 32(X10), X14 // arg 5 - abort MOV 0(X10), X10 // arg 1 - id CALL libc_thrsleep(SB) RET TEXT runtime·thrwakeup_trampoline(SB),NOSPLIT,$8 MOVW 8(X10), X11 // arg 2 - count MOV 0(X10), X10 // arg 1 - id CALL libc_thrwakeup(SB) RET TEXT runtime·exit_trampoline(SB),NOSPLIT,$8 MOVW 0(X10), X10 // arg 1 - status CALL libc_exit(SB) MOV $0, X5 // crash on failure MOV X5, (X5) RET TEXT runtime·getthrid_trampoline(SB),NOSPLIT,$8 MOV X10, X9 // pointer to args CALL libc_getthrid(SB) MOVW X10, 0(X9) // return value RET TEXT runtime·raiseproc_trampoline(SB),NOSPLIT,$8 MOV X10, X9 // pointer to args CALL libc_getpid(SB) // arg 1 - pid (result in X10) MOVW 0(X9), X11 // arg 2 - signal CALL libc_kill(SB) RET TEXT runtime·sched_yield_trampoline(SB),NOSPLIT,$8 CALL libc_sched_yield(SB) RET TEXT runtime·mmap_trampoline(SB),NOSPLIT,$8 MOV X10, X9 // pointer to args MOV 0(X9), X10 // arg 1 - addr MOV 8(X9), X11 // arg 2 - len MOVW 16(X9), X12 // arg 3 - prot MOVW 20(X9), X13 // arg 4 - flags MOVW 24(X9), X14 // arg 5 - fid MOVW 28(X9), X15 // arg 6 - offset CALL libc_mmap(SB) MOV $0, X5 MOV $-1, X6 BNE X6, X10, noerr CALL libc_errno(SB) MOVW (X10), X5 // errno MOV $0, X10 noerr: MOV X10, 32(X9) MOV X5, 40(X9) RET TEXT runtime·munmap_trampoline(SB),NOSPLIT,$8 MOV 8(X10), X11 // arg 2 - len MOV 0(X10), X10 // arg 1 - addr CALL libc_munmap(SB) MOV $-1, X5 BNE X5, X10, 3(PC) MOV $0, X5 // crash on failure MOV X5, (X5) RET TEXT runtime·madvise_trampoline(SB),NOSPLIT,$8 MOV 8(X10), X11 // arg 2 - len MOVW 16(X10), X12 // arg 3 - advice MOV 0(X10), X10 // arg 1 - addr CALL libc_madvise(SB) // ignore failure - maybe pages are locked RET TEXT runtime·open_trampoline(SB),NOSPLIT,$8 MOVW 8(X10), X11 // arg 2 - flags MOVW 12(X10), X12 // arg 3 - mode MOV 0(X10), X10 // arg 1 - path MOV $0, X13 // varargs CALL libc_open(SB) RET TEXT runtime·close_trampoline(SB),NOSPLIT,$8 MOVW 0(X10), X10 // arg 1 - fd CALL libc_close(SB) RET TEXT runtime·read_trampoline(SB),NOSPLIT,$8 MOV 8(X10), X11 // arg 2 - buf MOVW 16(X10), X12 // arg 3 - count MOVW 0(X10), X10 // arg 1 - fd (int32 from read) CALL libc_read(SB) MOV $-1, X5 BNE X5, X10, noerr CALL libc_errno(SB) MOVW (X10), X10 // errno NEG X10 // caller expects negative errno noerr: RET TEXT runtime·write_trampoline(SB),NOSPLIT,$8 MOV 8(X10), X11 // arg 2 - buf MOVW 16(X10), X12 // arg 3 - count MOV 0(X10), X10 // arg 1 - fd (uintptr from write1) CALL libc_write(SB) MOV $-1, X5 BNE X5, X10, noerr CALL libc_errno(SB) MOVW (X10), X10 // errno NEG X10 // caller expects negative errno noerr: RET TEXT runtime·pipe2_trampoline(SB),NOSPLIT,$8 MOVW 8(X10), X11 // arg 2 - flags MOV 0(X10), X10 // arg 1 - filedes CALL libc_pipe2(SB) MOV $-1, X5 BNE X5, X10, noerr CALL libc_errno(SB) MOVW (X10), X10 // errno NEG X10 // caller expects negative errno noerr: RET TEXT runtime·setitimer_trampoline(SB),NOSPLIT,$8 MOV 8(X10), X11 // arg 2 - new MOV 16(X10), X12 // arg 3 - old MOVW 0(X10), X10 // arg 1 - which CALL libc_setitimer(SB) RET TEXT runtime·usleep_trampoline(SB),NOSPLIT,$8 MOVW 0(X10), X10 // arg 1 - usec CALL libc_usleep(SB) RET TEXT runtime·sysctl_trampoline(SB),NOSPLIT,$8 MOVW 8(X10), X11 // arg 2 - miblen MOV 16(X10), X12 // arg 3 - out MOV 24(X10), X13 // arg 4 - size MOV 32(X10), X14 // arg 5 - dst MOV 40(X10), X15 // arg 6 - ndst MOV 0(X10), X10 // arg 1 - mib CALL libc_sysctl(SB) RET TEXT runtime·kqueue_trampoline(SB),NOSPLIT,$8 CALL libc_kqueue(SB) RET TEXT runtime·kevent_trampoline(SB),NOSPLIT,$8 MOV 8(X10), X11 // arg 2 - keventt MOVW 16(X10), X12 // arg 3 - nch MOV 24(X10), X13 // arg 4 - ev MOVW 32(X10), X14 // arg 5 - nev MOV 40(X10), X15 // arg 6 - ts MOVW 0(X10), X10 // arg 1 - kq CALL libc_kevent(SB) MOV $-1, X5 BNE X5, X10, noerr CALL libc_errno(SB) MOVW (X10), X10 // errno NEG X10 // caller expects negative errno noerr: RET TEXT runtime·clock_gettime_trampoline(SB),NOSPLIT,$8 MOV 8(X10), X11 // arg 2 - tp MOVW 0(X10), X10 // arg 1 - clock_id CALL libc_clock_gettime(SB) MOV $-1, X5 BNE X5, X10, 3(PC) MOV $0, X5 // crash on failure MOV X5, (X5) RET TEXT runtime·fcntl_trampoline(SB),NOSPLIT,$8 MOV X10, X9 // pointer to args MOVW 0(X9), X10 // arg 1 - fd MOVW 4(X9), X11 // arg 2 - cmd MOVW 8(X9), X12 // arg 3 - arg MOV $0, X13 // vararg CALL libc_fcntl(SB) MOV $-1, X5 MOV $0, X11 BNE X5, X10, noerr CALL libc_errno(SB) MOVW (X10), X11 // errno MOV $-1, X10 noerr: MOVW X10, 12(X9) MOVW X11, 16(X9) RET TEXT runtime·sigaction_trampoline(SB),NOSPLIT,$8 MOV 8(X10), X11 // arg 2 - new MOV 16(X10), X12 // arg 3 - old MOVW 0(X10), X10 // arg 1 - sig CALL libc_sigaction(SB) MOV $-1, X5 BNE X5, X10, 3(PC) MOV $0, X5 // crash on failure MOV X5, (X5) RET TEXT runtime·sigprocmask_trampoline(SB),NOSPLIT,$8 MOV 8(X10), X11 // arg 2 - new MOV 16(X10), X12 // arg 3 - old MOVW 0(X10), X10 // arg 1 - how CALL libc_pthread_sigmask(SB) MOV $-1, X5 BNE X5, X10, 3(PC) MOV $0, X5 // crash on failure MOV X5, (X5) RET TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$8 MOV 8(X10), X11 // arg 2 - old MOV 0(X10), X10 // arg 1 - new CALL libc_sigaltstack(SB) MOV $-1, X5 BNE X5, X10, 3(PC) MOV $0, X5 // crash on failure MOV X5, (X5) RET TEXT runtime·issetugid_trampoline(SB),NOSPLIT,$0 MOV X10, X9 // pointer to args CALL libc_issetugid(SB) MOVW X10, 0(X9) // return value 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,$8 MOV X10, X9 // pointer to args MOV (0*8)(X9), X5 // fn MOV (1*8)(X9), X10 // a1 MOV (2*8)(X9), X11 // a2 MOV (3*8)(X9), X12 // a3 MOV $0, X13 // vararg JALR X1, X5 MOV X10, (4*8)(X9) // r1 MOV X11, (5*8)(X9) // r2 // Standard libc functions return -1 on error // and set errno. MOV $-1, X5 MOVW X10, X11 BNE X5, X11, ok // Get error code from libc. CALL libc_errno(SB) MOVW (X10), X10 MOV X10, (6*8)(X9) // 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,$8 MOV X10, X9 // pointer to args MOV (0*8)(X9), X5 // fn MOV (1*8)(X9), X10 // a1 MOV (2*8)(X9), X11 // a2 MOV (3*8)(X9), X12 // a3 MOV $0, X13 // vararg JALR X1, X5 MOV X10, (4*8)(X9) // r1 MOV X11, (5*8)(X9) // r2 // Standard libc functions return -1 on error // and set errno. MOV $-1, X5 BNE X5, X10, ok // Get error code from libc. CALL libc_errno(SB) MOVW (X10), X10 MOV X10, (6*8)(X9) // 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,$8 MOV X10, X9 // pointer to args MOV (0*8)(X9), X5 // fn MOV (1*8)(X9), X10 // a1 MOV (2*8)(X9), X11 // a2 MOV (3*8)(X9), X12 // a3 MOV (4*8)(X9), X13 // a4 MOV (5*8)(X9), X14 // a5 MOV (6*8)(X9), X15 // a6 MOV $0, X16 // vararg JALR X1, X5 MOV X10, (7*8)(X9) // r1 MOV X11, (8*8)(X9) // r2 // Standard libc functions return -1 on error // and set errno. MOV $-1, X5 MOVW X10, X11 BNE X5, X11, ok // Get error code from libc. CALL libc_errno(SB) MOVW (X10), X10 MOV X10, (9*8)(X9) // 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,$8 MOV X10, X9 // pointer to args MOV (0*8)(X9), X5 // fn MOV (1*8)(X9), X10 // a1 MOV (2*8)(X9), X11 // a2 MOV (3*8)(X9), X12 // a3 MOV (4*8)(X9), X13 // a4 MOV (5*8)(X9), X14 // a5 MOV (6*8)(X9), X15 // a6 MOV $0, X16 // vararg JALR X1, X5 MOV X10, (7*8)(X9) // r1 MOV X11, (8*8)(X9) // r2 // Standard libc functions return -1 on error // and set errno. MOV $-1, X5 BNE X5, X10, ok // Get error code from libc. CALL libc_errno(SB) MOVW (X10), X10 MOV X10, (9*8)(X9) // 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). // // The openbsd/riscv64 kernel only accepts eight syscall arguments. TEXT runtime·syscall10(SB),NOSPLIT,$0 MOV X10, X9 // pointer to args ADD $-16, X2 MOV (0*8)(X9), X5 // fn MOV (1*8)(X9), X10 // a1 MOV (2*8)(X9), X11 // a2 MOV (3*8)(X9), X12 // a3 MOV (4*8)(X9), X13 // a4 MOV (5*8)(X9), X14 // a5 MOV (6*8)(X9), X15 // a6 MOV (7*8)(X9), X16 // a7 MOV (8*8)(X9), X17 // a8 JALR X1, X5 MOV X10, (11*8)(X9) // r1 MOV X11, (12*8)(X9) // r2 // Standard libc functions return -1 on error // and set errno. MOV $-1, X5 MOVW X10, X11 BNE X5, X11, ok // Get error code from libc. CALL libc_errno(SB) MOVW (X10), X10 MOV X10, (13*8)(X9) // err ok: ADD $16, X2 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. // // The openbsd/riscv64 kernel only accepts eight syscall arguments. TEXT runtime·syscall10X(SB),NOSPLIT,$0 MOV X10, X9 // pointer to args ADD $-16, X2 MOV (0*8)(X9), X5 // fn MOV (1*8)(X9), X10 // a1 MOV (2*8)(X9), X11 // a2 MOV (3*8)(X9), X12 // a3 MOV (4*8)(X9), X13 // a4 MOV (5*8)(X9), X14 // a5 MOV (6*8)(X9), X15 // a6 MOV (7*8)(X9), X16 // a7 MOV (8*8)(X9), X17 // a8 JALR X1, X5 MOV X10, (11*8)(X9) // r1 MOV X11, (12*8)(X9) // r2 // Standard libc functions return -1 on error // and set errno. MOV $-1, X5 BNE X5, X10, ok // Get error code from libc. CALL libc_errno(SB) MOVW (X10), X10 MOV X10, (13*8)(X9) // err ok: ADD $16, X2 RET
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