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sys_linux_mipsx.s
// Copyright 2016 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. //go:build linux && (mips || mipsle) // // System calls and other sys.stuff for mips, Linux // #include "go_asm.h" #include "go_tls.h" #include "textflag.h" #define SYS_exit 4001 #define SYS_read 4003 #define SYS_write 4004 #define SYS_open 4005 #define SYS_close 4006 #define SYS_getpid 4020 #define SYS_kill 4037 #define SYS_brk 4045 #define SYS_mmap 4090 #define SYS_munmap 4091 #define SYS_setitimer 4104 #define SYS_clone 4120 #define SYS_sched_yield 4162 #define SYS_nanosleep 4166 #define SYS_rt_sigreturn 4193 #define SYS_rt_sigaction 4194 #define SYS_rt_sigprocmask 4195 #define SYS_sigaltstack 4206 #define SYS_madvise 4218 #define SYS_mincore 4217 #define SYS_gettid 4222 #define SYS_futex 4238 #define SYS_sched_getaffinity 4240 #define SYS_exit_group 4246 #define SYS_timer_create 4257 #define SYS_timer_settime 4258 #define SYS_timer_delete 4261 #define SYS_clock_gettime 4263 #define SYS_tgkill 4266 #define SYS_pipe2 4328 TEXT runtime·exit(SB),NOSPLIT,$0-4 MOVW code+0(FP), R4 MOVW $SYS_exit_group, R2 SYSCALL UNDEF RET // func exitThread(wait *atomic.Uint32) TEXT runtime·exitThread(SB),NOSPLIT,$0-4 MOVW wait+0(FP), R1 // We're done using the stack. MOVW $0, R2 SYNC MOVW R2, (R1) SYNC MOVW $0, R4 // exit code MOVW $SYS_exit, R2 SYSCALL UNDEF JMP 0(PC) TEXT runtime·open(SB),NOSPLIT,$0-16 MOVW name+0(FP), R4 MOVW mode+4(FP), R5 MOVW perm+8(FP), R6 MOVW $SYS_open, R2 SYSCALL BEQ R7, 2(PC) MOVW $-1, R2 MOVW R2, ret+12(FP) RET TEXT runtime·closefd(SB),NOSPLIT,$0-8 MOVW fd+0(FP), R4 MOVW $SYS_close, R2 SYSCALL BEQ R7, 2(PC) MOVW $-1, R2 MOVW R2, ret+4(FP) RET TEXT runtime·write1(SB),NOSPLIT,$0-16 MOVW fd+0(FP), R4 MOVW p+4(FP), R5 MOVW n+8(FP), R6 MOVW $SYS_write, R2 SYSCALL BEQ R7, 2(PC) SUBU R2, R0, R2 // caller expects negative errno MOVW R2, ret+12(FP) RET TEXT runtime·read(SB),NOSPLIT,$0-16 MOVW fd+0(FP), R4 MOVW p+4(FP), R5 MOVW n+8(FP), R6 MOVW $SYS_read, R2 SYSCALL BEQ R7, 2(PC) SUBU R2, R0, R2 // caller expects negative errno MOVW R2, ret+12(FP) RET // func pipe2(flags int32) (r, w int32, errno int32) TEXT runtime·pipe2(SB),NOSPLIT,$0-16 MOVW $r+4(FP), R4 MOVW flags+0(FP), R5 MOVW $SYS_pipe2, R2 SYSCALL BEQ R7, 2(PC) SUBU R2, R0, R2 // caller expects negative errno MOVW R2, errno+12(FP) RET TEXT runtime·usleep(SB),NOSPLIT,$28-4 MOVW usec+0(FP), R3 MOVW R3, R5 MOVW $1000000, R4 DIVU R4, R3 MOVW LO, R3 MOVW R3, 24(R29) MOVW $1000, R4 MULU R3, R4 MOVW LO, R4 SUBU R4, R5 MOVW R5, 28(R29) // nanosleep(&ts, 0) ADDU $24, R29, R4 MOVW $0, R5 MOVW $SYS_nanosleep, R2 SYSCALL RET TEXT runtime·gettid(SB),NOSPLIT,$0-4 MOVW $SYS_gettid, R2 SYSCALL MOVW R2, ret+0(FP) RET TEXT runtime·raise(SB),NOSPLIT,$0-4 MOVW $SYS_getpid, R2 SYSCALL MOVW R2, R16 MOVW $SYS_gettid, R2 SYSCALL MOVW R2, R5 // arg 2 tid MOVW R16, R4 // arg 1 pid MOVW sig+0(FP), R6 // arg 3 MOVW $SYS_tgkill, R2 SYSCALL RET TEXT runtime·raiseproc(SB),NOSPLIT,$0 MOVW $SYS_getpid, R2 SYSCALL MOVW R2, R4 // arg 1 pid MOVW sig+0(FP), R5 // arg 2 MOVW $SYS_kill, R2 SYSCALL RET TEXT ·getpid(SB),NOSPLIT,$0-4 MOVW $SYS_getpid, R2 SYSCALL MOVW R2, ret+0(FP) RET TEXT ·tgkill(SB),NOSPLIT,$0-12 MOVW tgid+0(FP), R4 MOVW tid+4(FP), R5 MOVW sig+8(FP), R6 MOVW $SYS_tgkill, R2 SYSCALL RET TEXT runtime·setitimer(SB),NOSPLIT,$0-12 MOVW mode+0(FP), R4 MOVW new+4(FP), R5 MOVW old+8(FP), R6 MOVW $SYS_setitimer, R2 SYSCALL RET TEXT runtime·timer_create(SB),NOSPLIT,$0-16 MOVW clockid+0(FP), R4 MOVW sevp+4(FP), R5 MOVW timerid+8(FP), R6 MOVW $SYS_timer_create, R2 SYSCALL MOVW R2, ret+12(FP) RET TEXT runtime·timer_settime(SB),NOSPLIT,$0-20 MOVW timerid+0(FP), R4 MOVW flags+4(FP), R5 MOVW new+8(FP), R6 MOVW old+12(FP), R7 MOVW $SYS_timer_settime, R2 SYSCALL MOVW R2, ret+16(FP) RET TEXT runtime·timer_delete(SB),NOSPLIT,$0-8 MOVW timerid+0(FP), R4 MOVW $SYS_timer_delete, R2 SYSCALL MOVW R2, ret+4(FP) RET TEXT runtime·mincore(SB),NOSPLIT,$0-16 MOVW addr+0(FP), R4 MOVW n+4(FP), R5 MOVW dst+8(FP), R6 MOVW $SYS_mincore, R2 SYSCALL SUBU R2, R0, R2 // caller expects negative errno MOVW R2, ret+12(FP) RET // func walltime() (sec int64, nsec int32) TEXT runtime·walltime(SB),NOSPLIT,$8-12 MOVW $0, R4 // CLOCK_REALTIME MOVW $4(R29), R5 MOVW $SYS_clock_gettime, R2 SYSCALL MOVW 4(R29), R3 // sec MOVW 8(R29), R5 // nsec MOVW $sec+0(FP), R6 #ifdef GOARCH_mips MOVW R3, 4(R6) MOVW R0, 0(R6) #else MOVW R3, 0(R6) MOVW R0, 4(R6) #endif MOVW R5, nsec+8(FP) RET TEXT runtime·nanotime1(SB),NOSPLIT,$8-8 MOVW $1, R4 // CLOCK_MONOTONIC MOVW $4(R29), R5 MOVW $SYS_clock_gettime, R2 SYSCALL MOVW 4(R29), R3 // sec MOVW 8(R29), R5 // nsec // sec is in R3, nsec in R5 // return nsec in R3 MOVW $1000000000, R4 MULU R4, R3 MOVW LO, R3 ADDU R5, R3 SGTU R5, R3, R4 MOVW $ret+0(FP), R6 #ifdef GOARCH_mips MOVW R3, 4(R6) #else MOVW R3, 0(R6) #endif MOVW HI, R3 ADDU R4, R3 #ifdef GOARCH_mips MOVW R3, 0(R6) #else MOVW R3, 4(R6) #endif RET TEXT runtime·rtsigprocmask(SB),NOSPLIT,$0-16 MOVW how+0(FP), R4 MOVW new+4(FP), R5 MOVW old+8(FP), R6 MOVW size+12(FP), R7 MOVW $SYS_rt_sigprocmask, R2 SYSCALL BEQ R7, 2(PC) UNDEF // crash RET TEXT runtime·rt_sigaction(SB),NOSPLIT,$0-20 MOVW sig+0(FP), R4 MOVW new+4(FP), R5 MOVW old+8(FP), R6 MOVW size+12(FP), R7 MOVW $SYS_rt_sigaction, R2 SYSCALL BEQ R7, 2(PC) SUBU R2, R0, R2 // caller expects negative errno MOVW R2, ret+16(FP) RET TEXT runtime·sigfwd(SB),NOSPLIT,$0-16 MOVW sig+4(FP), R4 MOVW info+8(FP), R5 MOVW ctx+12(FP), R6 MOVW fn+0(FP), R25 MOVW R29, R22 SUBU $16, R29 AND $~7, R29 // shadow space for 4 args aligned to 8 bytes as per O32 ABI JAL (R25) MOVW R22, R29 RET TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$12 // this might be called in external code context, // where g is not set. MOVB runtime·iscgo(SB), R1 BEQ R1, 2(PC) JAL runtime·load_g(SB) MOVW R4, 4(R29) MOVW R5, 8(R29) MOVW R6, 12(R29) MOVW $runtime·sigtrampgo(SB), R1 JAL (R1) RET TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0 JMP runtime·sigtramp(SB) TEXT runtime·mmap(SB),NOSPLIT,$20-32 MOVW addr+0(FP), R4 MOVW n+4(FP), R5 MOVW prot+8(FP), R6 MOVW flags+12(FP), R7 MOVW fd+16(FP), R8 MOVW off+20(FP), R9 MOVW R8, 16(R29) MOVW R9, 20(R29) MOVW $SYS_mmap, R2 SYSCALL BEQ R7, ok MOVW $0, p+24(FP) MOVW R2, err+28(FP) RET ok: MOVW R2, p+24(FP) MOVW $0, err+28(FP) RET TEXT runtime·munmap(SB),NOSPLIT,$0-8 MOVW addr+0(FP), R4 MOVW n+4(FP), R5 MOVW $SYS_munmap, R2 SYSCALL BEQ R7, 2(PC) UNDEF // crash RET TEXT runtime·madvise(SB),NOSPLIT,$0-16 MOVW addr+0(FP), R4 MOVW n+4(FP), R5 MOVW flags+8(FP), R6 MOVW $SYS_madvise, R2 SYSCALL MOVW R2, ret+12(FP) RET // int32 futex(int32 *uaddr, int32 op, int32 val, struct timespec *timeout, int32 *uaddr2, int32 val2); TEXT runtime·futex(SB),NOSPLIT,$20-28 MOVW addr+0(FP), R4 MOVW op+4(FP), R5 MOVW val+8(FP), R6 MOVW ts+12(FP), R7 MOVW addr2+16(FP), R8 MOVW val3+20(FP), R9 MOVW R8, 16(R29) MOVW R9, 20(R29) MOVW $SYS_futex, R2 SYSCALL BEQ R7, 2(PC) SUBU R2, R0, R2 // caller expects negative errno MOVW R2, ret+24(FP) RET // int32 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void)); TEXT runtime·clone(SB),NOSPLIT|NOFRAME,$0-24 MOVW flags+0(FP), R4 MOVW stk+4(FP), R5 MOVW R0, R6 // ptid MOVW R0, R7 // tls // O32 syscall handler unconditionally copies arguments 5-8 from stack, // even for syscalls with less than 8 arguments. Reserve 32 bytes of new // stack so that any syscall invoked immediately in the new thread won't fail. ADD $-32, R5 // Copy mp, gp, fn off parent stack for use by child. MOVW mp+8(FP), R16 MOVW gp+12(FP), R17 MOVW fn+16(FP), R18 MOVW $1234, R1 MOVW R16, 0(R5) MOVW R17, 4(R5) MOVW R18, 8(R5) MOVW R1, 12(R5) MOVW $SYS_clone, R2 SYSCALL BEQ R7, 2(PC) SUBU R2, R0, R2 // caller expects negative errno // In parent, return. BEQ R2, 3(PC) MOVW R2, ret+20(FP) RET // In child, on new stack. // Check that SP is as we expect NOP R29 // tell vet R29/SP changed - stop checking offsets MOVW 12(R29), R16 MOVW $1234, R1 BEQ R16, R1, 2(PC) MOVW (R0), R0 // Initialize m->procid to Linux tid MOVW $SYS_gettid, R2 SYSCALL MOVW 0(R29), R16 // m MOVW 4(R29), R17 // g MOVW 8(R29), R18 // fn BEQ R16, nog BEQ R17, nog MOVW R2, m_procid(R16) // In child, set up new stack MOVW R16, g_m(R17) MOVW R17, g // TODO(mips32): doesn't have runtime·stackcheck(SB) nog: // Call fn ADDU $32, R29 JAL (R18) // It shouldn't return. If it does, exit that thread. ADDU $-32, R29 MOVW $0xf4, R4 MOVW $SYS_exit, R2 SYSCALL UNDEF TEXT runtime·sigaltstack(SB),NOSPLIT,$0 MOVW new+0(FP), R4 MOVW old+4(FP), R5 MOVW $SYS_sigaltstack, R2 SYSCALL BEQ R7, 2(PC) UNDEF // crash RET TEXT runtime·osyield(SB),NOSPLIT,$0 MOVW $SYS_sched_yield, R2 SYSCALL RET TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0-16 MOVW pid+0(FP), R4 MOVW len+4(FP), R5 MOVW buf+8(FP), R6 MOVW $SYS_sched_getaffinity, R2 SYSCALL BEQ R7, 2(PC) SUBU R2, R0, R2 // caller expects negative errno MOVW R2, ret+12(FP) RET // func sbrk0() uintptr TEXT runtime·sbrk0(SB),NOSPLIT,$0-4 // Implemented as brk(NULL). MOVW $0, R4 MOVW $SYS_brk, R2 SYSCALL MOVW R2, ret+0(FP) RET TEXT runtime·access(SB),$0-12 BREAK // unimplemented, only needed for android; declared in stubs_linux.go MOVW R0, ret+8(FP) // for vet RET TEXT runtime·connect(SB),$0-16 BREAK // unimplemented, only needed for android; declared in stubs_linux.go MOVW R0, ret+12(FP) // for vet RET TEXT runtime·socket(SB),$0-16 BREAK // unimplemented, only needed for android; declared in stubs_linux.go MOVW R0, ret+12(FP) // for vet RET
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