| // 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" |
| |
| TEXT runtime·sys_umtx_op(SB),NOSPLIT,$-4 |
| MOVL $454, AX |
| INT $0x80 |
| MOVL AX, ret+20(FP) |
| RET |
| |
| TEXT runtime·thr_new(SB),NOSPLIT,$-4 |
| MOVL $455, AX |
| INT $0x80 |
| 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 $1, 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 *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 $431, AX // thr_exit |
| INT $0x80 |
| MOVL $0xf1, 0xf1 // crash |
| JMP 0(PC) |
| |
| TEXT runtime·open(SB),NOSPLIT,$-4 |
| MOVL $5, AX |
| INT $0x80 |
| JAE 2(PC) |
| MOVL $-1, AX |
| MOVL AX, ret+12(FP) |
| RET |
| |
| TEXT runtime·closefd(SB),NOSPLIT,$-4 |
| MOVL $6, AX |
| INT $0x80 |
| JAE 2(PC) |
| MOVL $-1, AX |
| MOVL AX, ret+4(FP) |
| RET |
| |
| TEXT runtime·read(SB),NOSPLIT,$-4 |
| MOVL $3, AX |
| INT $0x80 |
| JAE 2(PC) |
| MOVL $-1, AX |
| MOVL AX, ret+12(FP) |
| RET |
| |
| TEXT runtime·write(SB),NOSPLIT,$-4 |
| MOVL $4, AX |
| INT $0x80 |
| JAE 2(PC) |
| MOVL $-1, AX |
| MOVL AX, ret+12(FP) |
| RET |
| |
| TEXT runtime·raise(SB),NOSPLIT,$16 |
| // thr_self(&8(SP)) |
| LEAL 8(SP), AX |
| MOVL AX, 4(SP) |
| MOVL $432, AX |
| INT $0x80 |
| // thr_kill(self, SIGPIPE) |
| MOVL 8(SP), AX |
| MOVL AX, 4(SP) |
| MOVL sig+0(FP), AX |
| MOVL AX, 8(SP) |
| MOVL $433, AX |
| INT $0x80 |
| RET |
| |
| TEXT runtime·raiseproc(SB),NOSPLIT,$16 |
| // getpid |
| MOVL $20, AX |
| INT $0x80 |
| // kill(self, sig) |
| MOVL AX, 4(SP) |
| MOVL sig+0(FP), AX |
| MOVL AX, 8(SP) |
| MOVL $37, 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 $477, 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 $73, AX |
| INT $0x80 |
| JAE 2(PC) |
| MOVL $0xf1, 0xf1 // crash |
| RET |
| |
| TEXT runtime·madvise(SB),NOSPLIT,$-4 |
| MOVL $75, AX // madvise |
| INT $0x80 |
| JAE 2(PC) |
| MOVL $-1, AX |
| MOVL AX, ret+12(FP) |
| RET |
| |
| TEXT runtime·setitimer(SB), NOSPLIT, $-4 |
| MOVL $83, AX |
| INT $0x80 |
| RET |
| |
| // func fallback_walltime() (sec int64, nsec int32) |
| TEXT runtime·fallback_walltime(SB), NOSPLIT, $32-12 |
| MOVL $232, AX // clock_gettime |
| LEAL 12(SP), BX |
| MOVL $0, 4(SP) // CLOCK_REALTIME |
| 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 $232, AX |
| LEAL 12(SP), BX |
| MOVL $4, 4(SP) // CLOCK_MONOTONIC |
| 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 $416, 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,$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 $417, AX // sigreturn(ucontext) |
| INT $0x80 |
| MOVL $0xf1, 0xf1 // crash |
| RET |
| |
| TEXT runtime·sigaltstack(SB),NOSPLIT,$0 |
| MOVL $53, 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 $240, AX // sys_nanosleep |
| 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 $165, 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 $202, AX // sys___sysctl |
| 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 $331, AX // sys_sched_yield |
| 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 $340, AX // sys_sigprocmask |
| INT $0x80 |
| JAE 2(PC) |
| MOVL $0xf1, 0xf1 // crash |
| RET |
| |
| // int32 runtime·kqueue(void); |
| TEXT runtime·kqueue(SB),NOSPLIT,$0 |
| MOVL $362, 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 $363, AX |
| INT $0x80 |
| JAE 2(PC) |
| NEGL AX |
| MOVL AX, ret+24(FP) |
| RET |
| |
| // int32 runtime·closeonexec(int32 fd); |
| TEXT runtime·closeonexec(SB),NOSPLIT,$32 |
| MOVL $92, AX // fcntl |
| // 0(SP) is where the caller PC would be; kernel skips it |
| MOVL fd+0(FP), BX |
| MOVL BX, 4(SP) // fd |
| MOVL $2, 8(SP) // F_SETFD |
| MOVL $1, 12(SP) // FD_CLOEXEC |
| INT $0x80 |
| JAE 2(PC) |
| NEGL AX |
| RET |
| |
| // func cpuset_getaffinity(level int, which int, id int64, size int, mask *byte) int32 |
| TEXT runtime·cpuset_getaffinity(SB), NOSPLIT, $0-28 |
| MOVL $487, AX |
| INT $0x80 |
| JAE 2(PC) |
| NEGL AX |
| MOVL AX, ret+24(FP) |
| RET |
| |
| GLOBL runtime·tlsoffset(SB),NOPTR,$4 |
