| // 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 $-1, AX |
| MOVL AX, ret+12(FP) |
| RET |
| |
| TEXT runtime·write1(SB),NOSPLIT,$-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 walltime1() (sec int64, nsec int32) |
| TEXT runtime·walltime1(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 nanotime1(void) so really |
| // void nanotime1(int64 *nsec) |
| TEXT runtime·nanotime1(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 |
| |
| // Called by OS using C ABI. |
| TEXT runtime·sigtramp(SB),NOSPLIT,$28 |
| NOP SP // tell vet SP changed - stop checking offsets |
| // 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 32(SP), BX // signo |
| MOVL BX, 0(SP) |
| MOVL 36(SP), BX // info |
| MOVL BX, 4(SP) |
| MOVL 40(SP), BX // context |
| 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 set_tcb<>(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 base+4(FP), AX |
| MOVL AX, 0(SP) |
| CALL set_tcb<>(SB) |
| RET |
| |
| TEXT set_tcb<>(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 |
