2009-03-31 16:45:12 -06:00
|
|
|
// 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, Darwin
|
|
|
|
// See http://fxr.watson.org/fxr/source/bsd/kern/syscalls.c?v=xnu-1228
|
|
|
|
// or /usr/include/sys/syscall.h (on a Mac) for system call numbers.
|
|
|
|
|
2009-06-17 16:15:55 -06:00
|
|
|
#include "386/asm.h"
|
|
|
|
|
2009-03-31 16:45:12 -06:00
|
|
|
TEXT notok(SB),7,$0
|
|
|
|
MOVL $0xf1, 0xf1
|
|
|
|
RET
|
|
|
|
|
|
|
|
// Exit the entire program (like C exit)
|
2009-05-08 16:21:41 -06:00
|
|
|
TEXT exit(SB),7,$0
|
2009-03-31 16:45:12 -06:00
|
|
|
MOVL $1, AX
|
|
|
|
INT $0x80
|
|
|
|
CALL notok(SB)
|
|
|
|
RET
|
|
|
|
|
|
|
|
// Exit this OS thread (like pthread_exit, which eventually
|
|
|
|
// calls __bsdthread_terminate).
|
|
|
|
TEXT exit1(SB),7,$0
|
|
|
|
MOVL $361, AX
|
|
|
|
INT $0x80
|
|
|
|
JAE 2(PC)
|
|
|
|
CALL notok(SB)
|
|
|
|
RET
|
|
|
|
|
2009-06-17 16:15:55 -06:00
|
|
|
TEXT write(SB),7,$0
|
2009-03-31 16:45:12 -06:00
|
|
|
MOVL $4, AX
|
|
|
|
INT $0x80
|
|
|
|
JAE 2(PC)
|
|
|
|
CALL notok(SB)
|
|
|
|
RET
|
|
|
|
|
|
|
|
TEXT sys·mmap(SB),7,$0
|
|
|
|
MOVL $197, AX
|
|
|
|
INT $0x80
|
|
|
|
JAE 2(PC)
|
|
|
|
CALL notok(SB)
|
|
|
|
RET
|
|
|
|
|
|
|
|
TEXT sigaction(SB),7,$0
|
|
|
|
MOVL $46, AX
|
|
|
|
INT $0x80
|
|
|
|
JAE 2(PC)
|
|
|
|
CALL notok(SB)
|
|
|
|
RET
|
|
|
|
|
|
|
|
// Sigtramp's job is to call the actual signal handler.
|
|
|
|
// It is called with the following arguments on the stack:
|
|
|
|
// 0(FP) "return address" - ignored
|
|
|
|
// 4(FP) actual handler
|
|
|
|
// 8(FP) siginfo style - ignored
|
|
|
|
// 12(FP) signal number
|
|
|
|
// 16(FP) siginfo
|
|
|
|
// 20(FP) context
|
|
|
|
TEXT sigtramp(SB),7,$40
|
2009-06-17 16:15:55 -06:00
|
|
|
// g = m->gsignal
|
|
|
|
MOVL m, BP
|
|
|
|
MOVL m_gsignal(BP), BP
|
|
|
|
MOVL BP, g
|
2009-03-31 16:45:12 -06:00
|
|
|
|
|
|
|
MOVL handler+4(FP), DI
|
|
|
|
MOVL signo+12(FP), AX
|
|
|
|
MOVL siginfo+16(FP), BX
|
|
|
|
MOVL context+20(FP), CX
|
|
|
|
|
|
|
|
MOVL AX, 0(SP)
|
|
|
|
MOVL BX, 4(SP)
|
|
|
|
MOVL CX, 8(SP)
|
|
|
|
CALL DI
|
|
|
|
|
|
|
|
MOVL context+20(FP), CX
|
|
|
|
MOVL style+8(FP), BX
|
|
|
|
|
|
|
|
MOVL $0, 0(SP) // "caller PC" - ignored
|
|
|
|
MOVL CX, 4(SP)
|
|
|
|
MOVL BX, 8(SP)
|
|
|
|
MOVL $184, AX // sigreturn(ucontext, infostyle)
|
|
|
|
INT $0x80
|
|
|
|
CALL notok(SB)
|
|
|
|
RET
|
|
|
|
|
|
|
|
TEXT sigaltstack(SB),7,$0
|
|
|
|
MOVL $53, AX
|
|
|
|
INT $0x80
|
|
|
|
JAE 2(PC)
|
|
|
|
CALL notok(SB)
|
|
|
|
RET
|
|
|
|
|
2009-06-04 12:16:03 -06:00
|
|
|
// void bsdthread_create(void *stk, M *m, G *g, void (*fn)(void))
|
|
|
|
// System call args are: func arg stack pthread flags.
|
|
|
|
TEXT bsdthread_create(SB),7,$32
|
2009-03-31 16:45:12 -06:00
|
|
|
MOVL $360, AX
|
2009-06-04 12:16:03 -06:00
|
|
|
// 0(SP) is where the caller PC would be; kernel skips it
|
|
|
|
MOVL func+12(FP), BX
|
|
|
|
MOVL BX, 4(SP) // func
|
2009-06-17 16:15:55 -06:00
|
|
|
MOVL mm+4(FP), BX
|
2009-06-04 12:16:03 -06:00
|
|
|
MOVL BX, 8(SP) // arg
|
|
|
|
MOVL stk+0(FP), BX
|
|
|
|
MOVL BX, 12(SP) // stack
|
2009-06-17 16:15:55 -06:00
|
|
|
MOVL gg+8(FP), BX
|
2009-06-04 12:16:03 -06:00
|
|
|
MOVL BX, 16(SP) // pthread
|
|
|
|
MOVL $0x1000000, 20(SP) // flags = PTHREAD_START_CUSTOM
|
2009-03-31 16:45:12 -06:00
|
|
|
INT $0x80
|
|
|
|
JAE 2(PC)
|
|
|
|
CALL notok(SB)
|
|
|
|
RET
|
|
|
|
|
2009-06-04 12:16:03 -06:00
|
|
|
// The thread that bsdthread_create creates starts executing here,
|
|
|
|
// because we registered this function using bsdthread_register
|
|
|
|
// at startup.
|
|
|
|
// AX = "pthread" (= g)
|
|
|
|
// BX = mach thread port
|
|
|
|
// CX = "func" (= fn)
|
|
|
|
// DX = "arg" (= m)
|
|
|
|
// DI = stack top
|
|
|
|
// SI = flags (= 0x1000000)
|
|
|
|
// SP = stack - C_32_STK_ALIGN
|
2009-04-02 17:48:06 -06:00
|
|
|
TEXT bsdthread_start(SB),7,$0
|
2009-06-04 12:16:03 -06:00
|
|
|
// set up ldt 7+id to point at m->tls.
|
|
|
|
// m->tls is at m+40. newosproc left
|
|
|
|
// the m->id in tls[0].
|
2009-06-17 16:15:55 -06:00
|
|
|
LEAL m_tls(DX), BP
|
2009-06-04 12:16:03 -06:00
|
|
|
MOVL 0(BP), DI
|
|
|
|
ADDL $7, DI // m0 is LDT#7. count up.
|
|
|
|
// setldt(tls#, &tls, sizeof tls)
|
|
|
|
PUSHAL // save registers
|
|
|
|
PUSHL $32 // sizeof tls
|
|
|
|
PUSHL BP // &tls
|
|
|
|
PUSHL DI // tls #
|
|
|
|
CALL setldt(SB)
|
|
|
|
POPL AX
|
|
|
|
POPL AX
|
|
|
|
POPL AX
|
|
|
|
POPAL
|
|
|
|
|
|
|
|
// Now segment is established. Initialize m, g.
|
2009-06-17 16:15:55 -06:00
|
|
|
MOVL AX, g
|
|
|
|
MOVL DX, m
|
|
|
|
MOVL BX, m_procid(DX) // m->procid = thread port (for debuggers)
|
2009-06-04 12:16:03 -06:00
|
|
|
CALL CX // fn()
|
|
|
|
CALL exit1(SB)
|
2009-04-02 17:48:06 -06:00
|
|
|
RET
|
|
|
|
|
2009-06-04 12:16:03 -06:00
|
|
|
// void bsdthread_register(void)
|
|
|
|
// registers callbacks for threadstart (see bsdthread_create above
|
|
|
|
// and wqthread and pthsize (not used). returns 0 on success.
|
2009-03-31 16:45:12 -06:00
|
|
|
TEXT bsdthread_register(SB),7,$40
|
|
|
|
MOVL $366, AX
|
2009-06-04 12:16:03 -06:00
|
|
|
// 0(SP) is where kernel expects caller PC; ignored
|
|
|
|
MOVL $bsdthread_start(SB), 4(SP) // threadstart
|
|
|
|
MOVL $0, 8(SP) // wqthread, not used by us
|
|
|
|
MOVL $0, 12(SP) // pthsize, not used by us
|
|
|
|
MOVL $0, 16(SP) // paranoia
|
2009-03-31 16:45:12 -06:00
|
|
|
MOVL $0, 20(SP)
|
2009-06-04 12:16:03 -06:00
|
|
|
MOVL $0, 24(SP)
|
2009-03-31 16:45:12 -06:00
|
|
|
INT $0x80
|
|
|
|
JAE 2(PC)
|
|
|
|
CALL notok(SB)
|
|
|
|
RET
|
|
|
|
|
|
|
|
// Invoke Mach system call.
|
|
|
|
// Assumes system call number in AX,
|
|
|
|
// caller PC on stack, caller's caller PC next,
|
|
|
|
// and then the system call arguments.
|
|
|
|
//
|
|
|
|
// Can be used for BSD too, but we don't,
|
|
|
|
// because if you use this interface the BSD
|
|
|
|
// system call numbers need an extra field
|
|
|
|
// in the high 16 bits that seems to be the
|
|
|
|
// argument count in bytes but is not always.
|
|
|
|
// INT $0x80 works fine for those.
|
|
|
|
TEXT sysenter(SB),7,$0
|
|
|
|
POPL DX
|
|
|
|
MOVL SP, CX
|
|
|
|
BYTE $0x0F; BYTE $0x34; // SYSENTER
|
|
|
|
// returns to DX with SP set to CX
|
|
|
|
|
|
|
|
TEXT mach_msg_trap(SB),7,$0
|
|
|
|
MOVL $-31, AX
|
|
|
|
CALL sysenter(SB)
|
|
|
|
RET
|
|
|
|
|
|
|
|
TEXT mach_reply_port(SB),7,$0
|
|
|
|
MOVL $-26, AX
|
|
|
|
CALL sysenter(SB)
|
|
|
|
RET
|
|
|
|
|
|
|
|
TEXT mach_task_self(SB),7,$0
|
|
|
|
MOVL $-28, AX
|
|
|
|
CALL sysenter(SB)
|
|
|
|
RET
|
|
|
|
|
|
|
|
// Mach provides trap versions of the semaphore ops,
|
|
|
|
// instead of requiring the use of RPC.
|
|
|
|
|
|
|
|
// uint32 mach_semaphore_wait(uint32)
|
|
|
|
TEXT mach_semaphore_wait(SB),7,$0
|
|
|
|
MOVL $-36, AX
|
|
|
|
CALL sysenter(SB)
|
|
|
|
RET
|
|
|
|
|
|
|
|
// uint32 mach_semaphore_timedwait(uint32, uint32, uint32)
|
|
|
|
TEXT mach_semaphore_timedwait(SB),7,$0
|
|
|
|
MOVL $-38, AX
|
|
|
|
CALL sysenter(SB)
|
|
|
|
RET
|
|
|
|
|
|
|
|
// uint32 mach_semaphore_signal(uint32)
|
|
|
|
TEXT mach_semaphore_signal(SB),7,$0
|
|
|
|
MOVL $-33, AX
|
|
|
|
CALL sysenter(SB)
|
|
|
|
RET
|
|
|
|
|
|
|
|
// uint32 mach_semaphore_signal_all(uint32)
|
|
|
|
TEXT mach_semaphore_signal_all(SB),7,$0
|
|
|
|
MOVL $-34, AX
|
|
|
|
CALL sysenter(SB)
|
|
|
|
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 setldt(SB),7,$32
|
2009-10-03 11:37:12 -06:00
|
|
|
MOVL address+4(FP), BX // aka base
|
|
|
|
MOVL limit+8(FP), CX
|
|
|
|
|
|
|
|
/*
|
|
|
|
* When linking against the system libraries,
|
|
|
|
* we use its pthread_create and let it set up %gs
|
|
|
|
* for us. When we do that, the private storage
|
|
|
|
* we get is not at 0(GS) but at 0x468(GS).
|
|
|
|
* To insulate the rest of the tool chain from this ugliness,
|
|
|
|
* 8l rewrites 0(GS) into 0x468(GS) for us.
|
|
|
|
* To accommodate that rewrite, we translate the
|
|
|
|
* address and limit here so that 0x468(GS) maps to 0(address).
|
|
|
|
*
|
|
|
|
* See ../../../../libcgo/darwin_386.c for the derivation
|
|
|
|
* of the constant.
|
|
|
|
*/
|
|
|
|
SUBL $0x468, BX
|
|
|
|
ADDL $0x468, CX
|
|
|
|
|
2009-03-31 16:45:12 -06:00
|
|
|
// 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)
|
|
|
|
|
2009-10-03 11:37:12 -06:00
|
|
|
MOVW CX, 0(AX)
|
|
|
|
SHRL $16, CX
|
|
|
|
ANDL $0x0F, CX
|
|
|
|
ORL $0x40, CX // 32-bit operand size
|
|
|
|
MOVB CX, 6(AX)
|
2009-03-31 16:45:12 -06:00
|
|
|
|
|
|
|
MOVL $0xF2, 5(AX) // r/w data descriptor, dpl=3, present
|
|
|
|
|
|
|
|
// call i386_set_ldt(entry, desc, 1)
|
2009-10-03 11:37:12 -06:00
|
|
|
MOVL $0xffffffff, 0(SP) // auto-allocate entry and return in AX
|
2009-03-31 16:45:12 -06:00
|
|
|
MOVL AX, 4(SP)
|
|
|
|
MOVL $1, 8(SP)
|
|
|
|
CALL i386_set_ldt(SB)
|
2009-09-22 17:28:32 -06:00
|
|
|
|
|
|
|
// compute segment selector - (entry*8+7)
|
|
|
|
SHLL $3, AX
|
|
|
|
ADDL $7, AX
|
|
|
|
MOVW AX, GS
|
2009-03-31 16:45:12 -06:00
|
|
|
RET
|
|
|
|
|
|
|
|
TEXT i386_set_ldt(SB),7,$0
|
|
|
|
MOVL $5, AX
|
|
|
|
INT $0x82 // sic
|
|
|
|
JAE 2(PC)
|
|
|
|
CALL notok(SB)
|
|
|
|
RET
|
|
|
|
|
2009-10-03 11:37:12 -06:00
|
|
|
GLOBL tlsoffset(SB),$4
|