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sys_freebsd_arm.s
// Copyright 2012 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 ARM, FreeBSD // /usr/src/sys/kern/syscalls.master for syscall numbers. // #include "go_asm.h" #include "go_tls.h" #include "textflag.h" // for EABI, as we don't support OABI #define SYS_BASE 0x0 #define SYS_exit (SYS_BASE + 1) #define SYS_read (SYS_BASE + 3) #define SYS_write (SYS_BASE + 4) #define SYS_open (SYS_BASE + 5) #define SYS_close (SYS_BASE + 6) #define SYS_getpid (SYS_BASE + 20) #define SYS_kill (SYS_BASE + 37) #define SYS_sigaltstack (SYS_BASE + 53) #define SYS_munmap (SYS_BASE + 73) #define SYS_madvise (SYS_BASE + 75) #define SYS_setitimer (SYS_BASE + 83) #define SYS_fcntl (SYS_BASE + 92) #define SYS___sysctl (SYS_BASE + 202) #define SYS_nanosleep (SYS_BASE + 240) #define SYS_issetugid (SYS_BASE + 253) #define SYS_clock_gettime (SYS_BASE + 232) #define SYS_sched_yield (SYS_BASE + 331) #define SYS_sigprocmask (SYS_BASE + 340) #define SYS_kqueue (SYS_BASE + 362) #define SYS_sigaction (SYS_BASE + 416) #define SYS_thr_exit (SYS_BASE + 431) #define SYS_thr_self (SYS_BASE + 432) #define SYS_thr_kill (SYS_BASE + 433) #define SYS__umtx_op (SYS_BASE + 454) #define SYS_thr_new (SYS_BASE + 455) #define SYS_mmap (SYS_BASE + 477) #define SYS_cpuset_getaffinity (SYS_BASE + 487) #define SYS_pipe2 (SYS_BASE + 542) #define SYS_kevent (SYS_BASE + 560) TEXT runtime·sys_umtx_op(SB),NOSPLIT,$0 MOVW addr+0(FP), R0 MOVW mode+4(FP), R1 MOVW val+8(FP), R2 MOVW uaddr1+12(FP), R3 ADD $20, R13 // arg 5 is passed on stack MOVW $SYS__umtx_op, R7 SWI $0 RSB.CS $0, R0 SUB $20, R13 // BCS error MOVW R0, ret+20(FP) RET TEXT runtime·thr_new(SB),NOSPLIT,$0 MOVW param+0(FP), R0 MOVW size+4(FP), R1 MOVW $SYS_thr_new, R7 SWI $0 RSB.CS $0, R0 MOVW R0, ret+8(FP) RET TEXT runtime·thr_start(SB),NOSPLIT,$0 // set up g MOVW m_g0(R0), g MOVW R0, g_m(g) BL runtime·emptyfunc(SB) // fault if stack check is wrong BL runtime·mstart(SB) MOVW $2, R8 // crash (not reached) MOVW R8, (R8) RET // Exit the entire program (like C exit) TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0 MOVW code+0(FP), R0 // arg 1 exit status MOVW $SYS_exit, R7 SWI $0 MOVW.CS $0, R8 // crash on syscall failure MOVW.CS R8, (R8) RET // func exitThread(wait *atomic.Uint32) TEXT runtime·exitThread(SB),NOSPLIT,$0-4 MOVW wait+0(FP), R0 // We're done using the stack. MOVW $0, R2 storeloop: LDREX (R0), R4 // loads R4 STREX R2, (R0), R1 // stores R2 CMP $0, R1 BNE storeloop MOVW $0, R0 // arg 1 long *state MOVW $SYS_thr_exit, R7 SWI $0 MOVW.CS $0, R8 // crash on syscall failure MOVW.CS R8, (R8) JMP 0(PC) TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0 MOVW name+0(FP), R0 // arg 1 name MOVW mode+4(FP), R1 // arg 2 mode MOVW perm+8(FP), R2 // arg 3 perm MOVW $SYS_open, R7 SWI $0 MOVW.CS $-1, R0 MOVW R0, ret+12(FP) RET TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0 MOVW fd+0(FP), R0 // arg 1 fd MOVW p+4(FP), R1 // arg 2 buf MOVW n+8(FP), R2 // arg 3 count MOVW $SYS_read, R7 SWI $0 RSB.CS $0, R0 // caller expects negative errno MOVW R0, ret+12(FP) RET // func pipe2(flags int32) (r, w int32, errno int32) TEXT runtime·pipe2(SB),NOSPLIT,$0-16 MOVW $r+4(FP), R0 MOVW flags+0(FP), R1 MOVW $SYS_pipe2, R7 SWI $0 RSB.CS $0, R0 MOVW R0, errno+12(FP) RET TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0 MOVW fd+0(FP), R0 // arg 1 fd MOVW p+4(FP), R1 // arg 2 buf MOVW n+8(FP), R2 // arg 3 count MOVW $SYS_write, R7 SWI $0 RSB.CS $0, R0 // caller expects negative errno MOVW R0, ret+12(FP) RET TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0 MOVW fd+0(FP), R0 // arg 1 fd MOVW $SYS_close, R7 SWI $0 MOVW.CS $-1, R0 MOVW R0, ret+4(FP) RET TEXT runtime·thr_self(SB),NOSPLIT,$0-4 // thr_self(&0(FP)) MOVW $ret+0(FP), R0 // arg 1 MOVW $SYS_thr_self, R7 SWI $0 RET TEXT runtime·thr_kill(SB),NOSPLIT,$0-8 // thr_kill(tid, sig) MOVW tid+0(FP), R0 // arg 1 id MOVW sig+4(FP), R1 // arg 2 signal MOVW $SYS_thr_kill, R7 SWI $0 RET TEXT runtime·raiseproc(SB),NOSPLIT,$0 // getpid MOVW $SYS_getpid, R7 SWI $0 // kill(self, sig) // arg 1 - pid, now in R0 MOVW sig+0(FP), R1 // arg 2 - signal MOVW $SYS_kill, R7 SWI $0 RET TEXT runtime·setitimer(SB), NOSPLIT|NOFRAME, $0 MOVW mode+0(FP), R0 MOVW new+4(FP), R1 MOVW old+8(FP), R2 MOVW $SYS_setitimer, R7 SWI $0 RET // func fallback_walltime() (sec int64, nsec int32) TEXT runtime·fallback_walltime(SB), NOSPLIT, $32-12 MOVW $0, R0 // CLOCK_REALTIME MOVW $8(R13), R1 MOVW $SYS_clock_gettime, R7 SWI $0 MOVW 8(R13), R0 // sec.low MOVW 12(R13), R1 // sec.high MOVW 16(R13), R2 // nsec MOVW R0, sec_lo+0(FP) MOVW R1, sec_hi+4(FP) MOVW R2, nsec+8(FP) RET // func fallback_nanotime() int64 TEXT runtime·fallback_nanotime(SB), NOSPLIT, $32 MOVW $4, R0 // CLOCK_MONOTONIC MOVW $8(R13), R1 MOVW $SYS_clock_gettime, R7 SWI $0 MOVW 8(R13), R0 // sec.low MOVW 12(R13), R4 // sec.high MOVW 16(R13), R2 // nsec MOVW $1000000000, R3 MULLU R0, R3, (R1, R0) MUL R3, R4 ADD.S R2, R0 ADC R4, R1 MOVW R0, ret_lo+0(FP) MOVW R1, ret_hi+4(FP) RET TEXT runtime·asmSigaction(SB),NOSPLIT|NOFRAME,$0 MOVW sig+0(FP), R0 // arg 1 sig MOVW new+4(FP), R1 // arg 2 act MOVW old+8(FP), R2 // arg 3 oact MOVW $SYS_sigaction, R7 SWI $0 MOVW.CS $-1, R0 MOVW R0, ret+12(FP) RET TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$0 // Reserve space for callee-save registers and arguments. MOVM.DB.W [R4-R11], (R13) SUB $16, R13 // this might be called in external code context, // where g is not set. // first save R0, because runtime·load_g will clobber it MOVW R0, 4(R13) // signum MOVB runtime·iscgo(SB), R0 CMP $0, R0 BL.NE runtime·load_g(SB) MOVW R1, 8(R13) MOVW R2, 12(R13) BL runtime·sigtrampgo(SB) // Restore callee-save registers. ADD $16, R13 MOVM.IA.W (R13), [R4-R11] RET TEXT runtime·mmap(SB),NOSPLIT,$16 MOVW addr+0(FP), R0 // arg 1 addr MOVW n+4(FP), R1 // arg 2 len MOVW prot+8(FP), R2 // arg 3 prot MOVW flags+12(FP), R3 // arg 4 flags // arg 5 (fid) and arg6 (offset_lo, offset_hi) are passed on stack // note the C runtime only passes the 32-bit offset_lo to us MOVW fd+16(FP), R4 // arg 5 MOVW R4, 4(R13) MOVW off+20(FP), R5 // arg 6 lower 32-bit // the word at 8(R13) is skipped due to 64-bit argument alignment. MOVW R5, 12(R13) MOVW $0, R6 // higher 32-bit for arg 6 MOVW R6, 16(R13) ADD $4, R13 MOVW $SYS_mmap, R7 SWI $0 SUB $4, R13 MOVW $0, R1 MOVW.CS R0, R1 // if failed, put in R1 MOVW.CS $0, R0 MOVW R0, p+24(FP) MOVW R1, err+28(FP) RET TEXT runtime·munmap(SB),NOSPLIT,$0 MOVW addr+0(FP), R0 // arg 1 addr MOVW n+4(FP), R1 // arg 2 len MOVW $SYS_munmap, R7 SWI $0 MOVW.CS $0, R8 // crash on syscall failure MOVW.CS R8, (R8) RET TEXT runtime·madvise(SB),NOSPLIT,$0 MOVW addr+0(FP), R0 // arg 1 addr MOVW n+4(FP), R1 // arg 2 len MOVW flags+8(FP), R2 // arg 3 flags MOVW $SYS_madvise, R7 SWI $0 MOVW.CS $-1, R0 MOVW R0, ret+12(FP) RET TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0 MOVW new+0(FP), R0 MOVW old+4(FP), R1 MOVW $SYS_sigaltstack, R7 SWI $0 MOVW.CS $0, R8 // crash on syscall failure MOVW.CS R8, (R8) RET TEXT runtime·sigfwd(SB),NOSPLIT,$0-16 MOVW sig+4(FP), R0 MOVW info+8(FP), R1 MOVW ctx+12(FP), R2 MOVW fn+0(FP), R11 MOVW R13, R4 SUB $24, R13 BIC $0x7, R13 // alignment for ELF ABI BL (R11) MOVW R4, R13 RET TEXT runtime·usleep(SB),NOSPLIT,$16 MOVW usec+0(FP), R0 CALL runtime·usplitR0(SB) // 0(R13) is the saved LR, don't use it MOVW R0, 4(R13) // tv_sec.low MOVW $0, R0 MOVW R0, 8(R13) // tv_sec.high MOVW $1000, R2 MUL R1, R2 MOVW R2, 12(R13) // tv_nsec MOVW $4(R13), R0 // arg 1 - rqtp MOVW $0, R1 // arg 2 - rmtp MOVW $SYS_nanosleep, R7 SWI $0 RET TEXT runtime·sysctl(SB),NOSPLIT,$0 MOVW mib+0(FP), R0 // arg 1 - name MOVW miblen+4(FP), R1 // arg 2 - namelen MOVW out+8(FP), R2 // arg 3 - old MOVW size+12(FP), R3 // arg 4 - oldlenp // arg 5 (newp) and arg 6 (newlen) are passed on stack ADD $20, R13 MOVW $SYS___sysctl, R7 SWI $0 SUB.CS $0, R0, R0 SUB $20, R13 MOVW R0, ret+24(FP) RET TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0 MOVW $SYS_sched_yield, R7 SWI $0 RET TEXT runtime·sigprocmask(SB),NOSPLIT,$0 MOVW how+0(FP), R0 // arg 1 - how MOVW new+4(FP), R1 // arg 2 - set MOVW old+8(FP), R2 // arg 3 - oset MOVW $SYS_sigprocmask, R7 SWI $0 MOVW.CS $0, R8 // crash on syscall failure MOVW.CS R8, (R8) RET // int32 runtime·kqueue(void) TEXT runtime·kqueue(SB),NOSPLIT,$0 MOVW $SYS_kqueue, R7 SWI $0 RSB.CS $0, R0 MOVW R0, ret+0(FP) RET // int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout) TEXT runtime·kevent(SB),NOSPLIT,$0 MOVW kq+0(FP), R0 // kq MOVW ch+4(FP), R1 // changelist MOVW nch+8(FP), R2 // nchanges MOVW ev+12(FP), R3 // eventlist ADD $20, R13 // pass arg 5 and 6 on stack MOVW $SYS_kevent, R7 SWI $0 RSB.CS $0, R0 SUB $20, R13 MOVW R0, ret+24(FP) RET // func fcntl(fd, cmd, arg int32) (int32, int32) TEXT runtime·fcntl(SB),NOSPLIT,$0 MOVW fd+0(FP), R0 // fd MOVW cmd+4(FP), R1 // cmd MOVW arg+8(FP), R2 // arg MOVW $SYS_fcntl, R7 SWI $0 MOVW $0, R1 MOVW.CS R0, R1 MOVW.CS $-1, R0 MOVW R0, ret+12(FP) MOVW R1, errno+16(FP) RET // TODO: this is only valid for ARMv7+ TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0 B runtime·armPublicationBarrier(SB) // TODO(minux): this only supports ARMv6K+. TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0 WORD $0xee1d0f70 // mrc p15, 0, r0, c13, c0, 3 RET // func cpuset_getaffinity(level int, which int, id int64, size int, mask *byte) int32 TEXT runtime·cpuset_getaffinity(SB), NOSPLIT, $0-28 MOVW level+0(FP), R0 MOVW which+4(FP), R1 MOVW id_lo+8(FP), R2 MOVW id_hi+12(FP), R3 ADD $20, R13 // Pass size and mask on stack. MOVW $SYS_cpuset_getaffinity, R7 SWI $0 RSB.CS $0, R0 SUB $20, R13 MOVW R0, ret+24(FP) RET // func getCntxct(physical bool) uint32 TEXT runtime·getCntxct(SB),NOSPLIT|NOFRAME,$0-8 MOVB runtime·goarm(SB), R11 CMP $7, R11 BLT 2(PC) DMB MOVB physical+0(FP), R0 CMP $1, R0 B.NE 3(PC) // get CNTPCT (Physical Count Register) into R0(low) R1(high) // mrrc 15, 0, r0, r1, cr14 WORD $0xec510f0e B 2(PC) // get CNTVCT (Virtual Count Register) into R0(low) R1(high) // mrrc 15, 1, r0, r1, cr14 WORD $0xec510f1e MOVW R0, ret+4(FP) RET // func issetugid() int32 TEXT runtime·issetugid(SB),NOSPLIT,$0 MOVW $SYS_issetugid, R7 SWI $0 MOVW R0, ret+0(FP) RET
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