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sys_freebsd_386.s
// Copyright 2009 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 386, FreeBSD // /usr/src/sys/kern/syscalls.master for syscall numbers. // #include "go_asm.h" #include "go_tls.h" #include "textflag.h" #define CLOCK_REALTIME 0 #define CLOCK_MONOTONIC 4 #define SYS_exit 1 #define SYS_read 3 #define SYS_write 4 #define SYS_open 5 #define SYS_close 6 #define SYS_getpid 20 #define SYS_kill 37 #define SYS_sigaltstack 53 #define SYS_munmap 73 #define SYS_madvise 75 #define SYS_setitimer 83 #define SYS_fcntl 92 #define SYS_sysarch 165 #define SYS___sysctl 202 #define SYS_clock_gettime 232 #define SYS_nanosleep 240 #define SYS_issetugid 253 #define SYS_sched_yield 331 #define SYS_sigprocmask 340 #define SYS_kqueue 362 #define SYS_sigaction 416 #define SYS_sigreturn 417 #define SYS_thr_exit 431 #define SYS_thr_self 432 #define SYS_thr_kill 433 #define SYS__umtx_op 454 #define SYS_thr_new 455 #define SYS_mmap 477 #define SYS_cpuset_getaffinity 487 #define SYS_pipe2 542 #define SYS_kevent 560 TEXT runtime·sys_umtx_op(SB),NOSPLIT,$-4 MOVL $SYS__umtx_op, AX INT $0x80 JAE 2(PC) NEGL AX MOVL AX, ret+20(FP) RET TEXT runtime·thr_new(SB),NOSPLIT,$-4 MOVL $SYS_thr_new, AX INT $0x80 JAE 2(PC) NEGL AX MOVL AX, ret+8(FP) RET // Called by OS using C ABI. TEXT runtime·thr_start(SB),NOSPLIT,$0 NOP SP // tell vet SP changed - stop checking offsets MOVL 4(SP), AX // m MOVL m_g0(AX), BX LEAL m_tls(AX), BP MOVL m_id(AX), DI ADDL $7, DI PUSHAL PUSHL $32 PUSHL BP PUSHL DI CALL runtime·setldt(SB) POPL AX POPL AX POPL AX POPAL get_tls(CX) MOVL BX, g(CX) MOVL AX, g_m(BX) CALL runtime·stackcheck(SB) // smashes AX CALL runtime·mstart(SB) MOVL 0, AX // crash (not reached) // Exit the entire program (like C exit) TEXT runtime·exit(SB),NOSPLIT,$-4 MOVL $SYS_exit, AX INT $0x80 MOVL $0xf1, 0xf1 // crash RET GLOBL exitStack<>(SB),RODATA,$8 DATA exitStack<>+0x00(SB)/4, $0 DATA exitStack<>+0x04(SB)/4, $0 // func exitThread(wait *atomic.Uint32) TEXT runtime·exitThread(SB),NOSPLIT,$0-4 MOVL wait+0(FP), AX // We're done using the stack. MOVL $0, (AX) // thr_exit takes a single pointer argument, which it expects // on the stack. We want to pass 0, so switch over to a fake // stack of 0s. It won't write to the stack. MOVL $exitStack<>(SB), SP MOVL $SYS_thr_exit, AX INT $0x80 MOVL $0xf1, 0xf1 // crash JMP 0(PC) TEXT runtime·open(SB),NOSPLIT,$-4 MOVL $SYS_open, AX INT $0x80 JAE 2(PC) MOVL $-1, AX MOVL AX, ret+12(FP) RET TEXT runtime·closefd(SB),NOSPLIT,$-4 MOVL $SYS_close, AX INT $0x80 JAE 2(PC) MOVL $-1, AX MOVL AX, ret+4(FP) RET TEXT runtime·read(SB),NOSPLIT,$-4 MOVL $SYS_read, AX INT $0x80 JAE 2(PC) NEGL AX // caller expects negative errno MOVL AX, ret+12(FP) RET // func pipe2(flags int32) (r, w int32, errno int32) TEXT runtime·pipe2(SB),NOSPLIT,$12-16 MOVL $SYS_pipe2, AX LEAL r+4(FP), BX MOVL BX, 4(SP) MOVL flags+0(FP), BX MOVL BX, 8(SP) INT $0x80 JAE 2(PC) NEGL AX MOVL AX, errno+12(FP) RET TEXT runtime·write1(SB),NOSPLIT,$-4 MOVL $SYS_write, AX INT $0x80 JAE 2(PC) NEGL AX // caller expects negative errno MOVL AX, ret+12(FP) RET TEXT runtime·thr_self(SB),NOSPLIT,$8-4 // thr_self(&0(FP)) LEAL ret+0(FP), AX MOVL AX, 4(SP) MOVL $SYS_thr_self, AX INT $0x80 RET TEXT runtime·thr_kill(SB),NOSPLIT,$-4 // thr_kill(tid, sig) MOVL $SYS_thr_kill, AX INT $0x80 RET TEXT runtime·raiseproc(SB),NOSPLIT,$16 // getpid MOVL $SYS_getpid, AX INT $0x80 // kill(self, sig) MOVL AX, 4(SP) MOVL sig+0(FP), AX MOVL AX, 8(SP) MOVL $SYS_kill, AX INT $0x80 RET TEXT runtime·mmap(SB),NOSPLIT,$32 LEAL addr+0(FP), SI LEAL 4(SP), DI CLD MOVSL MOVSL MOVSL MOVSL MOVSL MOVSL MOVL $0, AX // top 32 bits of file offset STOSL MOVL $SYS_mmap, AX INT $0x80 JAE ok MOVL $0, p+24(FP) MOVL AX, err+28(FP) RET ok: MOVL AX, p+24(FP) MOVL $0, err+28(FP) RET TEXT runtime·munmap(SB),NOSPLIT,$-4 MOVL $SYS_munmap, AX INT $0x80 JAE 2(PC) MOVL $0xf1, 0xf1 // crash RET TEXT runtime·madvise(SB),NOSPLIT,$-4 MOVL $SYS_madvise, AX INT $0x80 JAE 2(PC) MOVL $-1, AX MOVL AX, ret+12(FP) RET TEXT runtime·setitimer(SB), NOSPLIT, $-4 MOVL $SYS_setitimer, AX INT $0x80 RET // func fallback_walltime() (sec int64, nsec int32) TEXT runtime·fallback_walltime(SB), NOSPLIT, $32-12 MOVL $SYS_clock_gettime, AX LEAL 12(SP), BX MOVL $CLOCK_REALTIME, 4(SP) MOVL BX, 8(SP) INT $0x80 MOVL 12(SP), AX // sec MOVL 16(SP), BX // nsec // sec is in AX, nsec in BX MOVL AX, sec_lo+0(FP) MOVL $0, sec_hi+4(FP) MOVL BX, nsec+8(FP) RET // func fallback_nanotime() int64 TEXT runtime·fallback_nanotime(SB), NOSPLIT, $32-8 MOVL $SYS_clock_gettime, AX LEAL 12(SP), BX MOVL $CLOCK_MONOTONIC, 4(SP) MOVL BX, 8(SP) INT $0x80 MOVL 12(SP), AX // sec MOVL 16(SP), BX // nsec // sec is in AX, nsec in BX // convert to DX:AX nsec MOVL $1000000000, CX MULL CX ADDL BX, AX ADCL $0, DX MOVL AX, ret_lo+0(FP) MOVL DX, ret_hi+4(FP) RET TEXT runtime·asmSigaction(SB),NOSPLIT,$-4 MOVL $SYS_sigaction, AX INT $0x80 MOVL AX, ret+12(FP) RET TEXT runtime·sigfwd(SB),NOSPLIT,$12-16 MOVL fn+0(FP), AX MOVL sig+4(FP), BX MOVL info+8(FP), CX MOVL ctx+12(FP), DX MOVL SP, SI SUBL $32, SP ANDL $~15, SP // align stack: handler might be a C function MOVL BX, 0(SP) MOVL CX, 4(SP) MOVL DX, 8(SP) MOVL SI, 12(SP) // save SI: handler might be a Go function CALL AX MOVL 12(SP), AX MOVL AX, SP RET // Called by OS using C ABI. TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$12 NOP SP // tell vet SP changed - stop checking offsets MOVL 16(SP), BX // signo MOVL BX, 0(SP) MOVL 20(SP), BX // info MOVL BX, 4(SP) MOVL 24(SP), BX // context MOVL BX, 8(SP) CALL runtime·sigtrampgo(SB) // call sigreturn MOVL 24(SP), AX // context MOVL $0, 0(SP) // syscall gap MOVL AX, 4(SP) MOVL $SYS_sigreturn, AX INT $0x80 MOVL $0xf1, 0xf1 // crash RET TEXT runtime·sigaltstack(SB),NOSPLIT,$0 MOVL $SYS_sigaltstack, AX INT $0x80 JAE 2(PC) MOVL $0xf1, 0xf1 // crash RET TEXT runtime·usleep(SB),NOSPLIT,$20 MOVL $0, DX MOVL usec+0(FP), AX MOVL $1000000, CX DIVL CX MOVL AX, 12(SP) // tv_sec MOVL $1000, AX MULL DX MOVL AX, 16(SP) // tv_nsec MOVL $0, 0(SP) LEAL 12(SP), AX MOVL AX, 4(SP) // arg 1 - rqtp MOVL $0, 8(SP) // arg 2 - rmtp MOVL $SYS_nanosleep, AX INT $0x80 RET /* descriptor entry format for system call is the native machine format, ugly as it is: 2-byte limit 3-byte base 1-byte: 0x80=present, 0x60=dpl<<5, 0x1F=type 1-byte: 0x80=limit is *4k, 0x40=32-bit operand size, 0x0F=4 more bits of limit 1 byte: 8 more bits of base int i386_get_ldt(int, union ldt_entry *, int); int i386_set_ldt(int, const union ldt_entry *, int); */ // setldt(int entry, int address, int limit) TEXT runtime·setldt(SB),NOSPLIT,$32 MOVL base+4(FP), BX // see comment in sys_linux_386.s; freebsd is similar ADDL $0x4, BX // set up data_desc LEAL 16(SP), AX // struct data_desc MOVL $0, 0(AX) MOVL $0, 4(AX) MOVW BX, 2(AX) SHRL $16, BX MOVB BX, 4(AX) SHRL $8, BX MOVB BX, 7(AX) MOVW $0xffff, 0(AX) MOVB $0xCF, 6(AX) // 32-bit operand, 4k limit unit, 4 more bits of limit MOVB $0xF2, 5(AX) // r/w data descriptor, dpl=3, present // call i386_set_ldt(entry, desc, 1) MOVL $0xffffffff, 0(SP) // auto-allocate entry and return in AX MOVL AX, 4(SP) MOVL $1, 8(SP) CALL i386_set_ldt<>(SB) // compute segment selector - (entry*8+7) SHLL $3, AX ADDL $7, AX MOVW AX, GS RET TEXT i386_set_ldt<>(SB),NOSPLIT,$16 LEAL args+0(FP), AX // 0(FP) == 4(SP) before SP got moved MOVL $0, 0(SP) // syscall gap MOVL $1, 4(SP) MOVL AX, 8(SP) MOVL $SYS_sysarch, AX INT $0x80 JAE 2(PC) INT $3 RET TEXT runtime·sysctl(SB),NOSPLIT,$28 LEAL mib+0(FP), SI LEAL 4(SP), DI CLD MOVSL // arg 1 - name MOVSL // arg 2 - namelen MOVSL // arg 3 - oldp MOVSL // arg 4 - oldlenp MOVSL // arg 5 - newp MOVSL // arg 6 - newlen MOVL $SYS___sysctl, AX INT $0x80 JAE 4(PC) NEGL AX MOVL AX, ret+24(FP) RET MOVL $0, AX MOVL AX, ret+24(FP) RET TEXT runtime·osyield(SB),NOSPLIT,$-4 MOVL $SYS_sched_yield, AX INT $0x80 RET TEXT runtime·sigprocmask(SB),NOSPLIT,$16 MOVL $0, 0(SP) // syscall gap MOVL how+0(FP), AX // arg 1 - how MOVL AX, 4(SP) MOVL new+4(FP), AX MOVL AX, 8(SP) // arg 2 - set MOVL old+8(FP), AX MOVL AX, 12(SP) // arg 3 - oset MOVL $SYS_sigprocmask, AX INT $0x80 JAE 2(PC) MOVL $0xf1, 0xf1 // crash RET // int32 runtime·kqueue(void); TEXT runtime·kqueue(SB),NOSPLIT,$0 MOVL $SYS_kqueue, AX INT $0x80 JAE 2(PC) NEGL AX MOVL AX, 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 MOVL $SYS_kevent, AX INT $0x80 JAE 2(PC) NEGL AX MOVL AX, ret+24(FP) RET // func fcntl(fd, cmd, arg int32) (int32, int32) TEXT runtime·fcntl(SB),NOSPLIT,$-4 MOVL $SYS_fcntl, AX INT $0x80 JAE noerr MOVL $-1, ret+12(FP) MOVL AX, errno+16(FP) RET noerr: MOVL AX, ret+12(FP) MOVL $0, errno+16(FP) RET // func cpuset_getaffinity(level int, which int, id int64, size int, mask *byte) int32 TEXT runtime·cpuset_getaffinity(SB), NOSPLIT, $0-28 MOVL $SYS_cpuset_getaffinity, AX INT $0x80 JAE 2(PC) NEGL AX MOVL AX, ret+24(FP) RET GLOBL runtime·tlsoffset(SB),NOPTR,$4 // func issetugid() int32 TEXT runtime·issetugid(SB),NOSPLIT,$0 MOVL $SYS_issetugid, AX INT $0x80 MOVL AX, ret+0(FP) RET
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