| // 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" |
| |
| #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,$160 |
| // R0 points to the m. |
| // We are already on m's g0 stack. |
| |
| // Save callee-save registers. |
| MOVD R19, 8(RSP) |
| MOVD R20, 16(RSP) |
| MOVD R21, 24(RSP) |
| MOVD R22, 32(RSP) |
| MOVD R23, 40(RSP) |
| MOVD R24, 48(RSP) |
| MOVD R25, 56(RSP) |
| MOVD R26, 64(RSP) |
| MOVD R27, 72(RSP) |
| MOVD g, 80(RSP) |
| MOVD R29, 88(RSP) |
| FMOVD F8, 96(RSP) |
| FMOVD F9, 104(RSP) |
| FMOVD F10, 112(RSP) |
| FMOVD F11, 120(RSP) |
| FMOVD F12, 128(RSP) |
| FMOVD F13, 136(RSP) |
| FMOVD F14, 144(RSP) |
| FMOVD F15, 152(RSP) |
| |
| MOVD m_g0(R0), g |
| BL runtime·save_g(SB) |
| |
| BL runtime·mstart(SB) |
| |
| // Restore callee-save registers. |
| MOVD 8(RSP), R19 |
| MOVD 16(RSP), R20 |
| MOVD 24(RSP), R21 |
| MOVD 32(RSP), R22 |
| MOVD 40(RSP), R23 |
| MOVD 48(RSP), R24 |
| MOVD 56(RSP), R25 |
| MOVD 64(RSP), R26 |
| MOVD 72(RSP), R27 |
| MOVD 80(RSP), g |
| MOVD 88(RSP), R29 |
| FMOVD 96(RSP), F8 |
| FMOVD 104(RSP), F9 |
| FMOVD 112(RSP), F10 |
| FMOVD 120(RSP), F11 |
| FMOVD 128(RSP), F12 |
| FMOVD 136(RSP), F13 |
| FMOVD 144(RSP), F14 |
| FMOVD 152(RSP), F15 |
| |
| // 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,$192 |
| // Save callee-save registers in the case of signal forwarding. |
| // Please refer to https://golang.org/issue/31827 . |
| MOVD R19, 8*4(RSP) |
| MOVD R20, 8*5(RSP) |
| MOVD R21, 8*6(RSP) |
| MOVD R22, 8*7(RSP) |
| MOVD R23, 8*8(RSP) |
| MOVD R24, 8*9(RSP) |
| MOVD R25, 8*10(RSP) |
| MOVD R26, 8*11(RSP) |
| MOVD R27, 8*12(RSP) |
| MOVD g, 8*13(RSP) |
| MOVD R29, 8*14(RSP) |
| FMOVD F8, 8*15(RSP) |
| FMOVD F9, 8*16(RSP) |
| FMOVD F10, 8*17(RSP) |
| FMOVD F11, 8*18(RSP) |
| FMOVD F12, 8*19(RSP) |
| FMOVD F13, 8*20(RSP) |
| FMOVD F14, 8*21(RSP) |
| FMOVD F15, 8*22(RSP) |
| |
| // 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) |
| |
| MOVD R1, 16(RSP) |
| MOVD R2, 24(RSP) |
| BL runtime·sigtrampgo(SB) |
| |
| // Restore callee-save registers. |
| MOVD 8*4(RSP), R19 |
| MOVD 8*5(RSP), R20 |
| MOVD 8*6(RSP), R21 |
| MOVD 8*7(RSP), R22 |
| MOVD 8*8(RSP), R23 |
| MOVD 8*9(RSP), R24 |
| MOVD 8*10(RSP), R25 |
| MOVD 8*11(RSP), R26 |
| MOVD 8*12(RSP), R27 |
| MOVD 8*13(RSP), g |
| MOVD 8*14(RSP), R29 |
| FMOVD 8*15(RSP), F8 |
| FMOVD 8*16(RSP), F9 |
| FMOVD 8*17(RSP), F10 |
| FMOVD 8*18(RSP), F11 |
| FMOVD 8*19(RSP), F12 |
| FMOVD 8*20(RSP), F13 |
| FMOVD 8*21(RSP), F14 |
| FMOVD 8*22(RSP), F15 |
| |
| 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 3(PC) |
| MOVD $0, R0 // crash on failure |
| MOVD R0, (R0) |
| RET |
| |
| TEXT runtime·fcntl_trampoline(SB),NOSPLIT,$0 |
| MOVW 4(R0), R1 // arg 2 - cmd |
| MOVW 8(R0), R2 // arg 3 - arg |
| MOVW 0(R0), R0 // arg 1 - fd |
| MOVD $0, R3 // vararg |
| CALL libc_fcntl(SB) |
| 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 |
