| // Copyright 2015 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, Darwin |
| // System calls are implemented in libSystem, this file contains |
| // trampolines that convert from Go to C calling convention. |
| |
| #include "go_asm.h" |
| #include "go_tls.h" |
| #include "textflag.h" |
| #include "cgo/abi_arm64.h" |
| |
| #define CLOCK_REALTIME 0 |
| |
| TEXT notok<>(SB),NOSPLIT,$0 |
| MOVD $0, R8 |
| MOVD R8, (R8) |
| B 0(PC) |
| |
| TEXT runtime·open_trampoline(SB),NOSPLIT,$0 |
| SUB $16, RSP |
| MOVW 8(R0), R1 // arg 2 flags |
| MOVW 12(R0), R2 // arg 3 mode |
| MOVW R2, (RSP) // arg 3 is variadic, pass on stack |
| MOVD 0(R0), R0 // arg 1 pathname |
| BL libc_open(SB) |
| ADD $16, RSP |
| RET |
| |
| TEXT runtime·close_trampoline(SB),NOSPLIT,$0 |
| MOVW 0(R0), R0 // arg 1 fd |
| BL libc_close(SB) |
| 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 |
| BL libc_write(SB) |
| MOVD $-1, R1 |
| CMP R0, R1 |
| BNE noerr |
| BL libc_error(SB) |
| MOVW (R0), R0 |
| NEG R0, R0 // caller expects negative errno value |
| noerr: |
| 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 |
| BL libc_read(SB) |
| MOVD $-1, R1 |
| CMP R0, R1 |
| BNE noerr |
| BL libc_error(SB) |
| MOVW (R0), R0 |
| NEG R0, R0 // caller expects negative errno value |
| noerr: |
| RET |
| |
| TEXT runtime·pipe_trampoline(SB),NOSPLIT,$0 |
| BL libc_pipe(SB) // pointer already in R0 |
| CMP $0, R0 |
| BEQ 3(PC) |
| BL libc_error(SB) // return negative errno value |
| NEG R0, R0 |
| RET |
| |
| TEXT runtime·exit_trampoline(SB),NOSPLIT|NOFRAME,$0 |
| MOVW 0(R0), R0 |
| BL libc_exit(SB) |
| MOVD $1234, R0 |
| MOVD $1002, R1 |
| MOVD R0, (R1) // fail hard |
| |
| TEXT runtime·raiseproc_trampoline(SB),NOSPLIT,$0 |
| MOVD 0(R0), R19 // signal |
| BL libc_getpid(SB) |
| // arg 1 pid already in R0 from getpid |
| MOVD R19, R1 // arg 2 signal |
| BL libc_kill(SB) |
| RET |
| |
| TEXT runtime·mmap_trampoline(SB),NOSPLIT,$0 |
| MOVD R0, R19 |
| 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 fd |
| MOVW 28(R19), R5 // arg 6 off |
| BL libc_mmap(SB) |
| MOVD $0, R1 |
| MOVD $-1, R2 |
| CMP R0, R2 |
| BNE ok |
| BL libc_error(SB) |
| MOVW (R0), R1 |
| MOVD $0, R0 |
| ok: |
| MOVD R0, 32(R19) // ret 1 p |
| MOVD R1, 40(R19) // ret 2 err |
| RET |
| |
| TEXT runtime·munmap_trampoline(SB),NOSPLIT,$0 |
| MOVD 8(R0), R1 // arg 2 len |
| MOVD 0(R0), R0 // arg 1 addr |
| BL libc_munmap(SB) |
| CMP $0, R0 |
| BEQ 2(PC) |
| BL notok<>(SB) |
| 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 |
| BL libc_madvise(SB) |
| RET |
| |
| TEXT runtime·mlock_trampoline(SB),NOSPLIT,$0 |
| MOVD 8(R0), R1 // arg 2 len |
| MOVD 0(R0), R0 // arg 1 addr |
| BL libc_mlock(SB) |
| 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 |
| BL libc_setitimer(SB) |
| RET |
| |
| TEXT runtime·walltime_trampoline(SB),NOSPLIT,$0 |
| MOVD R0, R1 // arg 2 timespec |
| MOVW $CLOCK_REALTIME, R0 // arg 1 clock_id |
| BL libc_clock_gettime(SB) |
| RET |
| |
| GLOBL timebase<>(SB),NOPTR,$(machTimebaseInfo__size) |
| |
| TEXT runtime·nanotime_trampoline(SB),NOSPLIT,$40 |
| MOVD R0, R19 |
| BL libc_mach_absolute_time(SB) |
| MOVD R0, 0(R19) |
| MOVW timebase<>+machTimebaseInfo_numer(SB), R20 |
| MOVD $timebase<>+machTimebaseInfo_denom(SB), R21 |
| LDARW (R21), R21 // atomic read |
| CMP $0, R21 |
| BNE initialized |
| |
| SUB $(machTimebaseInfo__size+15)/16*16, RSP |
| MOVD RSP, R0 |
| BL libc_mach_timebase_info(SB) |
| MOVW machTimebaseInfo_numer(RSP), R20 |
| MOVW machTimebaseInfo_denom(RSP), R21 |
| ADD $(machTimebaseInfo__size+15)/16*16, RSP |
| |
| MOVW R20, timebase<>+machTimebaseInfo_numer(SB) |
| MOVD $timebase<>+machTimebaseInfo_denom(SB), R22 |
| STLRW R21, (R22) // atomic write |
| |
| initialized: |
| MOVW R20, 8(R19) |
| MOVW R21, 12(R19) |
| 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) |
| RET |
| |
| TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$176 |
| // 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) |
| |
| // Save arguments. |
| MOVW R0, (8*1)(RSP) // sig |
| MOVD R1, (8*2)(RSP) // info |
| MOVD R2, (8*3)(RSP) // ctx |
| |
| // this might be called in external code context, |
| // where g is not set. |
| BL runtime·load_g(SB) |
| |
| #ifdef GOOS_ios |
| MOVD RSP, R6 |
| CMP $0, g |
| BEQ nog |
| // iOS always use the main stack to run the signal handler. |
| // We need to switch to gsignal ourselves. |
| MOVD g_m(g), R11 |
| MOVD m_gsignal(R11), R5 |
| MOVD (g_stack+stack_hi)(R5), R6 |
| |
| nog: |
| // Restore arguments. |
| MOVW (8*1)(RSP), R0 |
| MOVD (8*2)(RSP), R1 |
| MOVD (8*3)(RSP), R2 |
| |
| // Reserve space for args and the stack pointer on the |
| // gsignal stack. |
| SUB $48, R6 |
| // Save stack pointer. |
| MOVD RSP, R4 |
| MOVD R4, (8*4)(R6) |
| // Switch to gsignal stack. |
| MOVD R6, RSP |
| |
| // Save arguments. |
| MOVW R0, (8*1)(RSP) |
| MOVD R1, (8*2)(RSP) |
| MOVD R2, (8*3)(RSP) |
| #endif |
| |
| // Call sigtrampgo. |
| MOVD $runtime·sigtrampgo(SB), R11 |
| BL (R11) |
| |
| #ifdef GOOS_ios |
| // Switch to old stack. |
| MOVD (8*4)(RSP), R5 |
| MOVD R5, RSP |
| #endif |
| |
| // Restore callee-save registers. |
| RESTORE_R19_TO_R28(8*4) |
| RESTORE_F8_TO_F15(8*14) |
| |
| RET |
| |
| TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0 |
| JMP runtime·sigtramp(SB) |
| |
| 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 |
| BL libc_pthread_sigmask(SB) |
| CMP $0, R0 |
| BEQ 2(PC) |
| BL notok<>(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 how |
| BL libc_sigaction(SB) |
| CMP $0, R0 |
| BEQ 2(PC) |
| BL notok<>(SB) |
| RET |
| |
| TEXT runtime·usleep_trampoline(SB),NOSPLIT,$0 |
| MOVW 0(R0), R0 // arg 1 usec |
| BL libc_usleep(SB) |
| RET |
| |
| TEXT runtime·sysctl_trampoline(SB),NOSPLIT,$0 |
| MOVW 8(R0), R1 // arg 2 miblen |
| MOVD 16(R0), R2 // arg 3 oldp |
| MOVD 24(R0), R3 // arg 4 oldlenp |
| MOVD 32(R0), R4 // arg 5 newp |
| MOVD 40(R0), R5 // arg 6 newlen |
| MOVD 0(R0), R0 // arg 1 mib |
| BL libc_sysctl(SB) |
| RET |
| |
| TEXT runtime·sysctlbyname_trampoline(SB),NOSPLIT,$0 |
| MOVD 8(R0), R1 // arg 2 oldp |
| MOVD 16(R0), R2 // arg 3 oldlenp |
| MOVD 24(R0), R3 // arg 4 newp |
| MOVD 32(R0), R4 // arg 5 newlen |
| MOVD 0(R0), R0 // arg 1 name |
| BL libc_sysctlbyname(SB) |
| RET |
| |
| |
| TEXT runtime·kqueue_trampoline(SB),NOSPLIT,$0 |
| BL 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 |
| BL libc_kevent(SB) |
| MOVD $-1, R2 |
| CMP R0, R2 |
| BNE ok |
| BL libc_error(SB) |
| MOVW (R0), R0 // errno |
| NEG R0, R0 // caller wants it as a negative error code |
| ok: |
| RET |
| |
| TEXT runtime·fcntl_trampoline(SB),NOSPLIT,$0 |
| SUB $16, RSP |
| MOVW 4(R0), R1 // arg 2 cmd |
| MOVW 8(R0), R2 // arg 3 arg |
| MOVW R2, (RSP) // arg 3 is variadic, pass on stack |
| MOVW 0(R0), R0 // arg 1 fd |
| BL libc_fcntl(SB) |
| ADD $16, RSP |
| RET |
| |
| TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$0 |
| #ifdef GOOS_ios |
| // sigaltstack on iOS is not supported and will always |
| // run the signal handler on the main stack, so our sigtramp has |
| // to do the stack switch ourselves. |
| MOVW $43, R0 |
| BL libc_exit(SB) |
| #else |
| MOVD 8(R0), R1 // arg 2 old |
| MOVD 0(R0), R0 // arg 1 new |
| CALL libc_sigaltstack(SB) |
| CBZ R0, 2(PC) |
| BL notok<>(SB) |
| #endif |
| RET |
| |
| // Thread related functions |
| |
| // 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. |
| SAVE_R19_TO_R28(8) |
| SAVE_F8_TO_F15(88) |
| |
| MOVD m_g0(R0), g |
| BL ·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·pthread_attr_init_trampoline(SB),NOSPLIT,$0 |
| MOVD 0(R0), R0 // arg 1 attr |
| BL libc_pthread_attr_init(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 |
| BL 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 |
| BL libc_pthread_attr_setdetachstate(SB) |
| RET |
| |
| TEXT runtime·pthread_create_trampoline(SB),NOSPLIT,$0 |
| SUB $16, RSP |
| MOVD 0(R0), R1 // arg 2 state |
| MOVD 8(R0), R2 // arg 3 start |
| MOVD 16(R0), R3 // arg 4 arg |
| MOVD RSP, R0 // arg 1 &threadid (which we throw away) |
| BL libc_pthread_create(SB) |
| ADD $16, RSP |
| RET |
| |
| TEXT runtime·raise_trampoline(SB),NOSPLIT,$0 |
| MOVW 0(R0), R0 // arg 1 sig |
| BL libc_raise(SB) |
| RET |
| |
| TEXT runtime·pthread_mutex_init_trampoline(SB),NOSPLIT,$0 |
| MOVD 8(R0), R1 // arg 2 attr |
| MOVD 0(R0), R0 // arg 1 mutex |
| BL libc_pthread_mutex_init(SB) |
| RET |
| |
| TEXT runtime·pthread_mutex_lock_trampoline(SB),NOSPLIT,$0 |
| MOVD 0(R0), R0 // arg 1 mutex |
| BL libc_pthread_mutex_lock(SB) |
| RET |
| |
| TEXT runtime·pthread_mutex_unlock_trampoline(SB),NOSPLIT,$0 |
| MOVD 0(R0), R0 // arg 1 mutex |
| BL libc_pthread_mutex_unlock(SB) |
| RET |
| |
| TEXT runtime·pthread_cond_init_trampoline(SB),NOSPLIT,$0 |
| MOVD 8(R0), R1 // arg 2 attr |
| MOVD 0(R0), R0 // arg 1 cond |
| BL libc_pthread_cond_init(SB) |
| RET |
| |
| TEXT runtime·pthread_cond_wait_trampoline(SB),NOSPLIT,$0 |
| MOVD 8(R0), R1 // arg 2 mutex |
| MOVD 0(R0), R0 // arg 1 cond |
| BL libc_pthread_cond_wait(SB) |
| RET |
| |
| TEXT runtime·pthread_cond_timedwait_relative_np_trampoline(SB),NOSPLIT,$0 |
| MOVD 8(R0), R1 // arg 2 mutex |
| MOVD 16(R0), R2 // arg 3 timeout |
| MOVD 0(R0), R0 // arg 1 cond |
| BL libc_pthread_cond_timedwait_relative_np(SB) |
| RET |
| |
| TEXT runtime·pthread_cond_signal_trampoline(SB),NOSPLIT,$0 |
| MOVD 0(R0), R0 // arg 1 cond |
| BL libc_pthread_cond_signal(SB) |
| RET |
| |
| TEXT runtime·pthread_self_trampoline(SB),NOSPLIT,$0 |
| MOVD R0, R19 // R19 is callee-save |
| BL libc_pthread_self(SB) |
| MOVD R0, 0(R19) // return value |
| RET |
| |
| TEXT runtime·pthread_kill_trampoline(SB),NOSPLIT,$0 |
| MOVD 8(R0), R1 // arg 2 sig |
| MOVD 0(R0), R0 // arg 1 thread |
| BL libc_pthread_kill(SB) |
| RET |
| |
| TEXT runtime·pthread_key_create_trampoline(SB),NOSPLIT,$0 |
| MOVD 8(R0), R1 // arg 2 destructor |
| MOVD 0(R0), R0 // arg 1 *key |
| BL libc_pthread_key_create(SB) |
| RET |
| |
| TEXT runtime·pthread_setspecific_trampoline(SB),NOSPLIT,$0 |
| MOVD 8(R0), R1 // arg 2 value |
| MOVD 0(R0), R0 // arg 1 key |
| BL libc_pthread_setspecific(SB) |
| 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). |
| TEXT runtime·syscall(SB),NOSPLIT,$0 |
| SUB $16, RSP // push structure pointer |
| MOVD R0, 8(RSP) |
| |
| MOVD 0(R0), R12 // fn |
| MOVD 16(R0), R1 // a2 |
| MOVD 24(R0), R2 // a3 |
| MOVD 8(R0), R0 // a1 |
| |
| // If fn is declared as vararg, we have to pass the vararg arguments on the stack. |
| // (Because ios decided not to adhere to the standard arm64 calling convention, sigh...) |
| // The only libSystem calls we support that are vararg are open, fcntl, and ioctl, |
| // which are all of the form fn(x, y, ...). So we just need to put the 3rd arg |
| // on the stack as well. |
| // If we ever have other vararg libSystem calls, we might need to handle more cases. |
| MOVD R2, (RSP) |
| |
| BL (R12) |
| |
| MOVD 8(RSP), R2 // pop structure pointer |
| ADD $16, RSP |
| MOVD R0, 32(R2) // save r1 |
| MOVD R1, 40(R2) // save r2 |
| CMPW $-1, R0 |
| BNE ok |
| SUB $16, RSP // push structure pointer |
| MOVD R2, 8(RSP) |
| BL libc_error(SB) |
| MOVW (R0), R0 |
| MOVD 8(RSP), R2 // pop structure pointer |
| ADD $16, RSP |
| MOVD R0, 48(R2) // save 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). |
| TEXT runtime·syscallX(SB),NOSPLIT,$0 |
| SUB $16, RSP // push structure pointer |
| MOVD R0, (RSP) |
| |
| MOVD 0(R0), R12 // fn |
| MOVD 16(R0), R1 // a2 |
| MOVD 24(R0), R2 // a3 |
| MOVD 8(R0), R0 // a1 |
| BL (R12) |
| |
| MOVD (RSP), R2 // pop structure pointer |
| ADD $16, RSP |
| MOVD R0, 32(R2) // save r1 |
| MOVD R1, 40(R2) // save r2 |
| CMP $-1, R0 |
| BNE ok |
| SUB $16, RSP // push structure pointer |
| MOVD R2, (RSP) |
| BL libc_error(SB) |
| MOVW (R0), R0 |
| MOVD (RSP), R2 // pop structure pointer |
| ADD $16, RSP |
| MOVD R0, 48(R2) // save err |
| ok: |
| RET |
| |
| // syscallPtr is like syscallX except that the libc function reports an |
| // error by returning NULL and setting errno. |
| TEXT runtime·syscallPtr(SB),NOSPLIT,$0 |
| SUB $16, RSP // push structure pointer |
| MOVD R0, (RSP) |
| |
| MOVD 0(R0), R12 // fn |
| MOVD 16(R0), R1 // a2 |
| MOVD 24(R0), R2 // a3 |
| MOVD 8(R0), R0 // a1 |
| BL (R12) |
| |
| MOVD (RSP), R2 // pop structure pointer |
| ADD $16, RSP |
| MOVD R0, 32(R2) // save r1 |
| MOVD R1, 40(R2) // save r2 |
| CMP $0, R0 |
| BNE ok |
| SUB $16, RSP // push structure pointer |
| MOVD R2, (RSP) |
| BL libc_error(SB) |
| MOVW (R0), R0 |
| MOVD (RSP), R2 // pop structure pointer |
| ADD $16, RSP |
| MOVD R0, 48(R2) // save 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). |
| TEXT runtime·syscall6(SB),NOSPLIT,$0 |
| SUB $16, RSP // push structure pointer |
| MOVD R0, 8(RSP) |
| |
| MOVD 0(R0), R12 // fn |
| MOVD 16(R0), R1 // a2 |
| MOVD 24(R0), R2 // a3 |
| MOVD 32(R0), R3 // a4 |
| MOVD 40(R0), R4 // a5 |
| MOVD 48(R0), R5 // a6 |
| MOVD 8(R0), R0 // a1 |
| |
| // If fn is declared as vararg, we have to pass the vararg arguments on the stack. |
| // See syscall above. The only function this applies to is openat, for which the 4th |
| // arg must be on the stack. |
| MOVD R3, (RSP) |
| |
| BL (R12) |
| |
| MOVD 8(RSP), R2 // pop structure pointer |
| ADD $16, RSP |
| MOVD R0, 56(R2) // save r1 |
| MOVD R1, 64(R2) // save r2 |
| CMPW $-1, R0 |
| BNE ok |
| SUB $16, RSP // push structure pointer |
| MOVD R2, 8(RSP) |
| BL libc_error(SB) |
| MOVW (R0), R0 |
| MOVD 8(RSP), R2 // pop structure pointer |
| ADD $16, RSP |
| MOVD R0, 72(R2) // save 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). |
| TEXT runtime·syscall6X(SB),NOSPLIT,$0 |
| SUB $16, RSP // push structure pointer |
| MOVD R0, (RSP) |
| |
| MOVD 0(R0), R12 // fn |
| MOVD 16(R0), R1 // a2 |
| MOVD 24(R0), R2 // a3 |
| MOVD 32(R0), R3 // a4 |
| MOVD 40(R0), R4 // a5 |
| MOVD 48(R0), R5 // a6 |
| MOVD 8(R0), R0 // a1 |
| BL (R12) |
| |
| MOVD (RSP), R2 // pop structure pointer |
| ADD $16, RSP |
| MOVD R0, 56(R2) // save r1 |
| MOVD R1, 64(R2) // save r2 |
| CMP $-1, R0 |
| BNE ok |
| SUB $16, RSP // push structure pointer |
| MOVD R2, (RSP) |
| BL libc_error(SB) |
| MOVW (R0), R0 |
| MOVD (RSP), R2 // pop structure pointer |
| ADD $16, RSP |
| MOVD R0, 72(R2) // save err |
| ok: |
| RET |
| |
| // syscall_x509 is for crypto/x509. It is like syscall6 but does not check for errors, |
| // takes 5 uintptrs and 1 float64, and only returns one value, |
| // for use with standard C ABI functions. |
| TEXT runtime·syscall_x509(SB),NOSPLIT,$0 |
| SUB $16, RSP // push structure pointer |
| MOVD R0, (RSP) |
| |
| MOVD 0(R0), R12 // fn |
| MOVD 16(R0), R1 // a2 |
| MOVD 24(R0), R2 // a3 |
| MOVD 32(R0), R3 // a4 |
| MOVD 40(R0), R4 // a5 |
| FMOVD 48(R0), F0 // f1 |
| MOVD 8(R0), R0 // a1 |
| BL (R12) |
| |
| MOVD (RSP), R2 // pop structure pointer |
| ADD $16, RSP |
| MOVD R0, 56(R2) // save r1 |
| RET |
