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| // 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, OpenBSD
| // /usr/src/sys/kern/syscalls.master for syscall numbers.
| //
|
| #include "go_asm.h"
| #include "go_tls.h"
| #include "textflag.h"
|
| #define CLOCK_MONOTONIC $3
|
| // Exit the entire program (like C exit)
| TEXT runtime·exit(SB),NOSPLIT,$-4
| MOVL $1, AX
| INT $0x80
| MOVL $0xf1, 0xf1 // crash
| RET
|
| // func exitThread(wait *uint32)
| TEXT runtime·exitThread(SB),NOSPLIT,$0-4
| MOVL $302, AX // sys___threxit
| 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 // sys_write
| INT $0x80
| JAE 2(PC)
| MOVL $-1, AX
| MOVL AX, ret+12(FP)
| RET
|
| TEXT runtime·usleep(SB),NOSPLIT,$24
| MOVL $0, DX
| MOVL usec+0(FP), AX
| MOVL $1000000, CX
| DIVL CX
| MOVL AX, 12(SP) // tv_sec - l32
| MOVL $0, 16(SP) // tv_sec - h32
| MOVL $1000, AX
| MULL DX
| MOVL AX, 20(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 $91, AX // sys_nanosleep
| INT $0x80
| RET
|
| TEXT runtime·raise(SB),NOSPLIT,$16
| MOVL $299, AX // sys_getthrid
| INT $0x80
| MOVL $0, 0(SP)
| MOVL AX, 4(SP) // arg 1 - tid
| MOVL sig+0(FP), AX
| MOVL AX, 8(SP) // arg 2 - signum
| MOVL $0, 12(SP) // arg 3 - tcb
| MOVL $119, AX // sys_thrkill
| INT $0x80
| RET
|
| TEXT runtime·raiseproc(SB),NOSPLIT,$12
| MOVL $20, AX // sys_getpid
| INT $0x80
| MOVL $0, 0(SP)
| MOVL AX, 4(SP) // arg 1 - pid
| MOVL sig+0(FP), AX
| MOVL AX, 8(SP) // arg 2 - signum
| MOVL $122, AX // sys_kill
| INT $0x80
| RET
|
| TEXT runtime·mmap(SB),NOSPLIT,$36
| LEAL addr+0(FP), SI
| LEAL 4(SP), DI
| CLD
| MOVSL // arg 1 - addr
| MOVSL // arg 2 - len
| MOVSL // arg 3 - prot
| MOVSL // arg 4 - flags
| MOVSL // arg 5 - fd
| MOVL $0, AX
| STOSL // arg 6 - pad
| MOVSL // arg 7 - offset
| MOVL $0, AX // top 32 bits of file offset
| STOSL
| MOVL $197, AX // sys_mmap
| 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 // sys_munmap
| INT $0x80
| JAE 2(PC)
| MOVL $0xf1, 0xf1 // crash
| RET
|
| TEXT runtime·madvise(SB),NOSPLIT,$-4
| MOVL $75, AX // sys_madvise
| INT $0x80
| JAE 2(PC)
| MOVL $-1, AX
| MOVL AX, ret+12(FP)
| RET
|
| TEXT runtime·setitimer(SB),NOSPLIT,$-4
| MOVL $69, AX
| INT $0x80
| RET
|
| // func walltime() (sec int64, nsec int32)
| TEXT runtime·walltime(SB), NOSPLIT, $32
| LEAL 12(SP), BX
| MOVL $0, 4(SP) // arg 1 - clock_id
| MOVL BX, 8(SP) // arg 2 - tp
| MOVL $87, AX // sys_clock_gettime
| INT $0x80
|
| MOVL 12(SP), AX // sec - l32
| MOVL AX, sec_lo+0(FP)
| MOVL 16(SP), AX // sec - h32
| MOVL AX, sec_hi+4(FP)
|
| MOVL 20(SP), BX // nsec
| MOVL BX, nsec+8(FP)
| RET
|
| // int64 nanotime(void) so really
| // void nanotime(int64 *nsec)
| TEXT runtime·nanotime(SB),NOSPLIT,$32
| LEAL 12(SP), BX
| MOVL CLOCK_MONOTONIC, 4(SP) // arg 1 - clock_id
| MOVL BX, 8(SP) // arg 2 - tp
| MOVL $87, AX // sys_clock_gettime
| INT $0x80
|
| MOVL 16(SP), CX // sec - h32
| IMULL $1000000000, CX
|
| MOVL 12(SP), AX // sec - l32
| MOVL $1000000000, BX
| MULL BX // result in dx:ax
|
| MOVL 20(SP), BX // nsec
| ADDL BX, AX
| ADCL CX, DX // add high bits with carry
|
| MOVL AX, ret_lo+0(FP)
| MOVL DX, ret_hi+4(FP)
| RET
|
| TEXT runtime·sigaction(SB),NOSPLIT,$-4
| MOVL $46, AX // sys_sigaction
| INT $0x80
| JAE 2(PC)
| MOVL $0xf1, 0xf1 // crash
| RET
|
| TEXT runtime·obsdsigprocmask(SB),NOSPLIT,$-4
| MOVL $48, AX // sys_sigprocmask
| INT $0x80
| JAE 2(PC)
| MOVL $0xf1, 0xf1 // crash
| MOVL AX, ret+8(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
|
| TEXT runtime·sigtramp(SB),NOSPLIT,$28
| // Save callee-saved C registers, since the caller may be a C signal handler.
| MOVL BX, bx-4(SP)
| MOVL BP, bp-8(SP)
| MOVL SI, si-12(SP)
| MOVL DI, di-16(SP)
| // We don't save mxcsr or the x87 control word because sigtrampgo doesn't
| // modify them.
|
| MOVL signo+0(FP), BX
| MOVL BX, 0(SP)
| MOVL info+4(FP), BX
| MOVL BX, 4(SP)
| MOVL context+8(FP), BX
| MOVL BX, 8(SP)
| CALL runtime·sigtrampgo(SB)
|
| MOVL di-16(SP), DI
| MOVL si-12(SP), SI
| MOVL bp-8(SP), BP
| MOVL bx-4(SP), BX
| RET
|
| // int32 tfork(void *param, uintptr psize, M *mp, G *gp, void (*fn)(void));
| TEXT runtime·tfork(SB),NOSPLIT,$12
|
| // Copy mp, gp and fn from the parent stack onto the child stack.
| MOVL param+0(FP), AX
| MOVL 8(AX), CX // tf_stack
| SUBL $16, CX
| MOVL CX, 8(AX)
| MOVL mm+8(FP), SI
| MOVL SI, 0(CX)
| MOVL gg+12(FP), SI
| MOVL SI, 4(CX)
| MOVL fn+16(FP), SI
| MOVL SI, 8(CX)
| MOVL $1234, 12(CX)
|
| MOVL $0, 0(SP) // syscall gap
| MOVL param+0(FP), AX
| MOVL AX, 4(SP) // arg 1 - param
| MOVL psize+4(FP), AX
| MOVL AX, 8(SP) // arg 2 - psize
| MOVL $8, AX // sys___tfork
| INT $0x80
|
| // Return if tfork syscall failed.
| JCC 4(PC)
| NEGL AX
| MOVL AX, ret+20(FP)
| RET
|
| // In parent, return.
| CMPL AX, $0
| JEQ 3(PC)
| MOVL AX, ret+20(FP)
| RET
|
| // Paranoia: check that SP is as we expect.
| MOVL 12(SP), BP
| CMPL BP, $1234
| JEQ 2(PC)
| INT $3
|
| // Reload registers.
| MOVL 0(SP), BX // m
| MOVL 4(SP), DX // g
| MOVL 8(SP), SI // fn
|
| // Set FS to point at m->tls.
| LEAL m_tls(BX), BP
| PUSHAL // save registers
| PUSHL BP
| CALL runtime·settls(SB)
| POPL AX
| POPAL
|
| // Now segment is established. Initialize m, g.
| get_tls(AX)
| MOVL DX, g(AX)
| MOVL BX, g_m(DX)
|
| CALL runtime·stackcheck(SB) // smashes AX, CX
| MOVL 0(DX), DX // paranoia; check they are not nil
| MOVL 0(BX), BX
|
| // More paranoia; check that stack splitting code works.
| PUSHAL
| CALL runtime·emptyfunc(SB)
| POPAL
|
| // Call fn.
| CALL SI
|
| // fn should never return.
| MOVL $0x1234, 0x1005
| RET
|
| TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
| MOVL $288, AX // sys_sigaltstack
| MOVL new+0(FP), BX
| MOVL old+4(FP), CX
| INT $0x80
| CMPL AX, $0xfffff001
| JLS 2(PC)
| INT $3
| RET
|
| TEXT runtime·setldt(SB),NOSPLIT,$4
| // Under OpenBSD we set the GS base instead of messing with the LDT.
| MOVL tls0+4(FP), AX
| MOVL AX, 0(SP)
| CALL runtime·settls(SB)
| RET
|
| TEXT runtime·settls(SB),NOSPLIT,$8
| // adjust for ELF: wants to use -4(GS) for g
| MOVL tlsbase+0(FP), CX
| ADDL $4, CX
| MOVL $0, 0(SP) // syscall gap
| MOVL CX, 4(SP) // arg 1 - tcb
| MOVL $329, AX // sys___set_tcb
| INT $0x80
| JCC 2(PC)
| MOVL $0xf1, 0xf1 // crash
| RET
|
| TEXT runtime·osyield(SB),NOSPLIT,$-4
| MOVL $298, AX // sys_sched_yield
| INT $0x80
| RET
|
| TEXT runtime·thrsleep(SB),NOSPLIT,$-4
| MOVL $94, AX // sys___thrsleep
| INT $0x80
| MOVL AX, ret+20(FP)
| RET
|
| TEXT runtime·thrwakeup(SB),NOSPLIT,$-4
| MOVL $301, AX // sys___thrwakeup
| INT $0x80
| MOVL AX, ret+8(FP)
| 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
| JCC 4(PC)
| NEGL AX
| MOVL AX, ret+24(FP)
| RET
| MOVL $0, AX
| MOVL AX, ret+24(FP)
| RET
|
| // int32 runtime·kqueue(void);
| TEXT runtime·kqueue(SB),NOSPLIT,$0
| MOVL $269, 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 $72, AX // sys_kevent
| 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 // sys_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
|
| GLOBL runtime·tlsoffset(SB),NOPTR,$4
|
|
