mirror of
https://github.com/golang/go
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181 lines
3.0 KiB
ArmAsm
181 lines
3.0 KiB
ArmAsm
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// 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, FreeBSD
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// /usr/src/sys/kern/syscalls.master for syscall numbers.
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//
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#include "386/asm.h"
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TEXT sys_umtx_op(SB),7,$-4
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MOVL $454, AX
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INT $0x80
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RET
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TEXT thr_new(SB),7,$-4
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MOVL $455, AX
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INT $0x80
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RET
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TEXT thr_start(SB),7,$0
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MOVL mm+0(FP), AX
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MOVL m_g0(AX), BX
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LEAL m_tls(AX), BP
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MOVL 0(BP), DI
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ADDL $7, DI
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PUSHAL
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PUSHL $32
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PUSHL BP
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PUSHL DI
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CALL setldt(SB)
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POPL AX
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POPL AX
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POPL AX
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POPAL
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MOVL BX, g
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MOVL AX, m
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CALL mstart(SB)
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MOVL 0, AX // crash (not reached)
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// Exit the entire program (like C exit)
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TEXT exit(SB),7,$-4
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MOVL $1, AX
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INT $0x80
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CALL notok(SB)
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RET
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TEXT exit1(SB),7,$-4
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MOVL $431, AX
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INT $0x80
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JAE 2(PC)
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CALL notok(SB)
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RET
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TEXT write(SB),7,$-4
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MOVL $4, AX
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INT $0x80
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JAE 2(PC)
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CALL notok(SB)
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RET
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TEXT notok(SB),7,$0
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MOVL $0xf1, 0xf1
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RET
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TEXT runtime·mmap(SB),7,$-4
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MOVL $477, AX
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INT $0x80
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JAE 2(PC)
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CALL notok(SB)
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RET
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TEXT sigaction(SB),7,$-4
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MOVL $416, AX
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INT $0x80
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JAE 2(PC)
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CALL notok(SB)
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RET
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TEXT sigtramp(SB),7,$40
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// g = m->gsignal
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MOVL m, BP
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MOVL m_gsignal(BP), BP
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MOVL BP, g
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MOVL signo+0(FP), AX
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MOVL siginfo+4(FP), BX
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MOVL context+8(FP), CX
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MOVL AX, 0(SP)
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MOVL BX, 4(SP)
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MOVL CX, 8(SP)
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CALL sighandler(SB)
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// g = m->curg
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MOVL m, BP
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MOVL m_curg(BP), BP
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MOVL BP, g
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MOVL context+8(FP), AX
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MOVL $0, 0(SP) // syscall gap
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MOVL AX, 4(SP)
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MOVL $417, AX // sigreturn(ucontext)
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INT $0x80
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CALL notok(SB)
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RET
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TEXT sigaltstack(SB),7,$0
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MOVL $53, AX
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INT $0x80
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JAE 2(PC)
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CALL notok(SB)
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RET
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/*
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descriptor entry format for system call
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is the native machine format, ugly as it is:
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2-byte limit
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3-byte base
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1-byte: 0x80=present, 0x60=dpl<<5, 0x1F=type
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1-byte: 0x80=limit is *4k, 0x40=32-bit operand size,
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0x0F=4 more bits of limit
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1 byte: 8 more bits of base
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int i386_get_ldt(int, union ldt_entry *, int);
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int i386_set_ldt(int, const union ldt_entry *, int);
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*/
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// setldt(int entry, int address, int limit)
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TEXT setldt(SB),7,$32
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MOVL address+4(FP), BX // aka base
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MOVL limit+8(FP), CX
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// set up data_desc
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LEAL 16(SP), AX // struct data_desc
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MOVL $0, 0(AX)
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MOVL $0, 4(AX)
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MOVW BX, 2(AX)
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SHRL $16, BX
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MOVB BX, 4(AX)
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SHRL $8, BX
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MOVB BX, 7(AX)
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MOVW CX, 0(AX)
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SHRL $16, CX
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ANDL $0x0F, CX
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ORL $0x40, CX // 32-bit operand size
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MOVB CX, 6(AX)
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MOVB $0xF2, 5(AX) // r/w data descriptor, dpl=3, present
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// call i386_set_ldt(entry, desc, 1)
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MOVL $0xffffffff, 0(SP) // auto-allocate entry and return in AX
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MOVL AX, 4(SP)
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MOVL $1, 8(SP)
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CALL i386_set_ldt(SB)
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// compute segment selector - (entry*8+7)
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SHLL $3, AX
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ADDL $7, AX
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MOVW AX, GS
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RET
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TEXT i386_set_ldt(SB),7,$16
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LEAL args+0(FP), AX // 0(FP) == 4(SP) before SP got moved
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MOVL $0, 0(SP) // syscall gap
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MOVL $1, 4(SP)
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MOVL AX, 8(SP)
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MOVL $165, AX
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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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GLOBL tlsoffset(SB),$4
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