mirror of
https://github.com/golang/go
synced 2024-11-19 13:44:52 -07:00
a7bb8d3eb8
OpenBSD's __threxit syscall takes a pointer to a 32-bit value that will be zeroed immediately before the thread exits. Make use of this instead of zeroing freeWait from the exitThread assembly and using hacks like switching to a static stack, so this works on 386. Change-Id: I3ec5ead82b6496404834d148f713794d5d9da723 Reviewed-on: https://go-review.googlesource.com/105055 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Austin Clements <austin@google.com> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
417 lines
8.1 KiB
ArmAsm
417 lines
8.1 KiB
ArmAsm
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//
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// System calls and other sys.stuff for 386, OpenBSD
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// /usr/src/sys/kern/syscalls.master for syscall numbers.
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//
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#include "go_asm.h"
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#include "go_tls.h"
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#include "textflag.h"
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#define CLOCK_MONOTONIC $3
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// Exit the entire program (like C exit)
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TEXT runtime·exit(SB),NOSPLIT,$-4
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MOVL $1, AX
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INT $0x80
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MOVL $0xf1, 0xf1 // crash
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RET
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// func exitThread(wait *uint32)
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TEXT runtime·exitThread(SB),NOSPLIT,$0-4
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MOVL $302, AX // sys___threxit
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INT $0x80
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MOVL $0xf1, 0xf1 // crash
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JMP 0(PC)
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TEXT runtime·open(SB),NOSPLIT,$-4
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MOVL $5, AX
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INT $0x80
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JAE 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+12(FP)
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RET
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TEXT runtime·closefd(SB),NOSPLIT,$-4
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MOVL $6, AX
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INT $0x80
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JAE 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+4(FP)
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RET
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TEXT runtime·read(SB),NOSPLIT,$-4
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MOVL $3, AX
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INT $0x80
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JAE 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+12(FP)
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RET
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TEXT runtime·write(SB),NOSPLIT,$-4
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MOVL $4, AX // sys_write
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INT $0x80
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JAE 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+12(FP)
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RET
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TEXT runtime·usleep(SB),NOSPLIT,$24
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MOVL $0, DX
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MOVL usec+0(FP), AX
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MOVL $1000000, CX
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DIVL CX
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MOVL AX, 12(SP) // tv_sec - l32
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MOVL $0, 16(SP) // tv_sec - h32
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MOVL $1000, AX
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MULL DX
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MOVL AX, 20(SP) // tv_nsec
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MOVL $0, 0(SP)
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LEAL 12(SP), AX
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MOVL AX, 4(SP) // arg 1 - rqtp
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MOVL $0, 8(SP) // arg 2 - rmtp
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MOVL $91, AX // sys_nanosleep
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INT $0x80
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RET
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TEXT runtime·raise(SB),NOSPLIT,$16
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MOVL $299, AX // sys_getthrid
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INT $0x80
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MOVL $0, 0(SP)
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MOVL AX, 4(SP) // arg 1 - tid
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MOVL sig+0(FP), AX
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MOVL AX, 8(SP) // arg 2 - signum
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MOVL $0, 12(SP) // arg 3 - tcb
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MOVL $119, AX // sys_thrkill
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INT $0x80
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RET
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TEXT runtime·raiseproc(SB),NOSPLIT,$12
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MOVL $20, AX // sys_getpid
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INT $0x80
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MOVL $0, 0(SP)
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MOVL AX, 4(SP) // arg 1 - pid
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MOVL sig+0(FP), AX
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MOVL AX, 8(SP) // arg 2 - signum
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MOVL $122, AX // sys_kill
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INT $0x80
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RET
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TEXT runtime·mmap(SB),NOSPLIT,$36
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LEAL addr+0(FP), SI
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LEAL 4(SP), DI
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CLD
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MOVSL // arg 1 - addr
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MOVSL // arg 2 - len
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MOVSL // arg 3 - prot
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MOVSL // arg 4 - flags
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MOVSL // arg 5 - fd
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MOVL $0, AX
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STOSL // arg 6 - pad
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MOVSL // arg 7 - offset
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MOVL $0, AX // top 32 bits of file offset
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STOSL
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MOVL $197, AX // sys_mmap
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INT $0x80
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JAE ok
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MOVL $0, p+24(FP)
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MOVL AX, err+28(FP)
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RET
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ok:
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MOVL AX, p+24(FP)
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MOVL $0, err+28(FP)
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RET
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TEXT runtime·munmap(SB),NOSPLIT,$-4
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MOVL $73, AX // sys_munmap
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INT $0x80
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JAE 2(PC)
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MOVL $0xf1, 0xf1 // crash
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RET
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TEXT runtime·madvise(SB),NOSPLIT,$-4
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MOVL $75, AX // sys_madvise
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INT $0x80
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JAE 2(PC)
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MOVL $0xf1, 0xf1 // crash
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RET
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TEXT runtime·setitimer(SB),NOSPLIT,$-4
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MOVL $69, AX
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INT $0x80
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RET
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// func walltime() (sec int64, nsec int32)
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TEXT runtime·walltime(SB), NOSPLIT, $32
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LEAL 12(SP), BX
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MOVL $0, 4(SP) // arg 1 - clock_id
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MOVL BX, 8(SP) // arg 2 - tp
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MOVL $87, AX // sys_clock_gettime
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INT $0x80
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MOVL 12(SP), AX // sec - l32
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MOVL AX, sec_lo+0(FP)
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MOVL 16(SP), AX // sec - h32
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MOVL AX, sec_hi+4(FP)
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MOVL 20(SP), BX // nsec
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MOVL BX, nsec+8(FP)
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RET
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// int64 nanotime(void) so really
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// void nanotime(int64 *nsec)
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TEXT runtime·nanotime(SB),NOSPLIT,$32
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LEAL 12(SP), BX
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MOVL CLOCK_MONOTONIC, 4(SP) // arg 1 - clock_id
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MOVL BX, 8(SP) // arg 2 - tp
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MOVL $87, AX // sys_clock_gettime
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INT $0x80
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MOVL 16(SP), CX // sec - h32
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IMULL $1000000000, CX
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MOVL 12(SP), AX // sec - l32
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MOVL $1000000000, BX
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MULL BX // result in dx:ax
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MOVL 20(SP), BX // nsec
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ADDL BX, AX
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ADCL CX, DX // add high bits with carry
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MOVL AX, ret_lo+0(FP)
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MOVL DX, ret_hi+4(FP)
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RET
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TEXT runtime·sigaction(SB),NOSPLIT,$-4
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MOVL $46, AX // sys_sigaction
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INT $0x80
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JAE 2(PC)
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MOVL $0xf1, 0xf1 // crash
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RET
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TEXT runtime·obsdsigprocmask(SB),NOSPLIT,$-4
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MOVL $48, AX // sys_sigprocmask
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INT $0x80
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JAE 2(PC)
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MOVL $0xf1, 0xf1 // crash
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MOVL AX, ret+8(FP)
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RET
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TEXT runtime·sigfwd(SB),NOSPLIT,$12-16
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MOVL fn+0(FP), AX
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MOVL sig+4(FP), BX
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MOVL info+8(FP), CX
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MOVL ctx+12(FP), DX
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MOVL SP, SI
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SUBL $32, SP
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ANDL $~15, SP // align stack: handler might be a C function
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MOVL BX, 0(SP)
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MOVL CX, 4(SP)
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MOVL DX, 8(SP)
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MOVL SI, 12(SP) // save SI: handler might be a Go function
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CALL AX
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MOVL 12(SP), AX
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MOVL AX, SP
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RET
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TEXT runtime·sigtramp(SB),NOSPLIT,$28
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// Save callee-saved C registers, since the caller may be a C signal handler.
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MOVL BX, bx-4(SP)
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MOVL BP, bp-8(SP)
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MOVL SI, si-12(SP)
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MOVL DI, di-16(SP)
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// We don't save mxcsr or the x87 control word because sigtrampgo doesn't
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// modify them.
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MOVL signo+0(FP), BX
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MOVL BX, 0(SP)
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MOVL info+4(FP), BX
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MOVL BX, 4(SP)
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MOVL context+8(FP), BX
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MOVL BX, 8(SP)
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CALL runtime·sigtrampgo(SB)
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MOVL di-16(SP), DI
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MOVL si-12(SP), SI
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MOVL bp-8(SP), BP
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MOVL bx-4(SP), BX
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RET
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// int32 tfork(void *param, uintptr psize, M *mp, G *gp, void (*fn)(void));
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TEXT runtime·tfork(SB),NOSPLIT,$12
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// Copy mp, gp and fn from the parent stack onto the child stack.
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MOVL param+0(FP), AX
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MOVL 8(AX), CX // tf_stack
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SUBL $16, CX
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MOVL CX, 8(AX)
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MOVL mm+8(FP), SI
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MOVL SI, 0(CX)
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MOVL gg+12(FP), SI
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MOVL SI, 4(CX)
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MOVL fn+16(FP), SI
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MOVL SI, 8(CX)
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MOVL $1234, 12(CX)
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MOVL $0, 0(SP) // syscall gap
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MOVL param+0(FP), AX
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MOVL AX, 4(SP) // arg 1 - param
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MOVL psize+4(FP), AX
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MOVL AX, 8(SP) // arg 2 - psize
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MOVL $8, AX // sys___tfork
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INT $0x80
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// Return if tfork syscall failed.
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JCC 4(PC)
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NEGL AX
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MOVL AX, ret+20(FP)
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RET
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// In parent, return.
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CMPL AX, $0
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JEQ 3(PC)
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MOVL AX, ret+20(FP)
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RET
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// Paranoia: check that SP is as we expect.
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MOVL 12(SP), BP
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CMPL BP, $1234
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JEQ 2(PC)
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INT $3
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// Reload registers.
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MOVL 0(SP), BX // m
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MOVL 4(SP), DX // g
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MOVL 8(SP), SI // fn
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// Set FS to point at m->tls.
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LEAL m_tls(BX), BP
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PUSHAL // save registers
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PUSHL BP
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CALL runtime·settls(SB)
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POPL AX
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POPAL
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// Now segment is established. Initialize m, g.
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get_tls(AX)
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MOVL DX, g(AX)
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MOVL BX, g_m(DX)
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CALL runtime·stackcheck(SB) // smashes AX, CX
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MOVL 0(DX), DX // paranoia; check they are not nil
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MOVL 0(BX), BX
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// More paranoia; check that stack splitting code works.
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PUSHAL
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CALL runtime·emptyfunc(SB)
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POPAL
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// Call fn.
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CALL SI
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// fn should never return.
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MOVL $0x1234, 0x1005
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RET
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TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
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MOVL $288, AX // sys_sigaltstack
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MOVL new+0(FP), BX
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MOVL old+4(FP), CX
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INT $0x80
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CMPL AX, $0xfffff001
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JLS 2(PC)
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INT $3
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RET
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TEXT runtime·setldt(SB),NOSPLIT,$4
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// Under OpenBSD we set the GS base instead of messing with the LDT.
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MOVL tls0+4(FP), AX
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MOVL AX, 0(SP)
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CALL runtime·settls(SB)
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RET
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TEXT runtime·settls(SB),NOSPLIT,$8
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// adjust for ELF: wants to use -4(GS) for g
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MOVL tlsbase+0(FP), CX
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ADDL $4, CX
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MOVL $0, 0(SP) // syscall gap
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MOVL CX, 4(SP) // arg 1 - tcb
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MOVL $329, AX // sys___set_tcb
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INT $0x80
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JCC 2(PC)
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MOVL $0xf1, 0xf1 // crash
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RET
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TEXT runtime·osyield(SB),NOSPLIT,$-4
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MOVL $298, AX // sys_sched_yield
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INT $0x80
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RET
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TEXT runtime·thrsleep(SB),NOSPLIT,$-4
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MOVL $94, AX // sys___thrsleep
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INT $0x80
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MOVL AX, ret+20(FP)
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RET
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TEXT runtime·thrwakeup(SB),NOSPLIT,$-4
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MOVL $301, AX // sys___thrwakeup
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INT $0x80
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MOVL AX, ret+8(FP)
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RET
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TEXT runtime·sysctl(SB),NOSPLIT,$28
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LEAL mib+0(FP), SI
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LEAL 4(SP), DI
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CLD
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MOVSL // arg 1 - name
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MOVSL // arg 2 - namelen
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MOVSL // arg 3 - oldp
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MOVSL // arg 4 - oldlenp
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MOVSL // arg 5 - newp
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MOVSL // arg 6 - newlen
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MOVL $202, AX // sys___sysctl
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INT $0x80
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JCC 4(PC)
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NEGL AX
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MOVL AX, ret+24(FP)
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RET
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MOVL $0, AX
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MOVL AX, ret+24(FP)
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RET
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// int32 runtime·kqueue(void);
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TEXT runtime·kqueue(SB),NOSPLIT,$0
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MOVL $269, AX
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INT $0x80
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JAE 2(PC)
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NEGL AX
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MOVL AX, ret+0(FP)
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RET
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// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout);
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TEXT runtime·kevent(SB),NOSPLIT,$0
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MOVL $72, AX // sys_kevent
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INT $0x80
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JAE 2(PC)
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NEGL AX
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MOVL AX, ret+24(FP)
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RET
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// int32 runtime·closeonexec(int32 fd);
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TEXT runtime·closeonexec(SB),NOSPLIT,$32
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MOVL $92, AX // sys_fcntl
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// 0(SP) is where the caller PC would be; kernel skips it
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MOVL fd+0(FP), BX
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MOVL BX, 4(SP) // fd
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MOVL $2, 8(SP) // F_SETFD
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MOVL $1, 12(SP) // FD_CLOEXEC
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INT $0x80
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JAE 2(PC)
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NEGL AX
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RET
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GLOBL runtime·tlsoffset(SB),NOPTR,$4
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