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go/src/runtime/sys_netbsd_386.s
Austin Clements ec721d92bf runtime: fix uses of ABIInternal PCs in assembly 
The covers three kinds of uses:

1. Calls of closures from assembly. These are always ABIInternal calls
without wrappers. I went through every indirect call in the runtime
and I think mcall is the only case of assembly calling a Go closure in
a way that's affected by ABIInternal. systemstack also calls a
closure, but it takes no arguments.

2. Calls of Go functions that expect raw ABIInternal pointers. I also
only found one of these: callbackasm1 -> cgocallback on Windows. These
are trickier to find, though.

3. Finally, I found one case on NetBSD where new OS threads were
directly calling the Go runtime entry-point from assembly via a PC,
rather than going through a wrapper. This meant new threads may not
have special registers set up. In this case, a change on all other
OSes had already forced new thread entry to go through an ABI wrapper,
so I just caught NetBSD up with that change.

With this change, I'm able to run a "hello world" with
GOEXPERIMENT=regabi,regabiargs.

For #40724.

Change-Id: I2a6d0e530c4fd4edf13484d923891c6160d683aa
Reviewed-on: https://go-review.googlesource.com/c/go/+/305669
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
2021-04-01 00:51:26 +00:00

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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, NetBSD
// /usr/src/sys/kern/syscalls.master for syscall numbers.
//
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
#define CLOCK_REALTIME 0
#define CLOCK_MONOTONIC 3
#define FD_CLOEXEC 1
#define F_SETFD 2
#define SYS_exit 1
#define SYS_read 3
#define SYS_write 4
#define SYS_open 5
#define SYS_close 6
#define SYS_getpid 20
#define SYS_kill 37
#define SYS_munmap 73
#define SYS_madvise 75
#define SYS_fcntl 92
#define SYS_mmap 197
#define SYS___sysctl 202
#define SYS___sigaltstack14 281
#define SYS___sigprocmask14 293
#define SYS_getcontext 307
#define SYS_setcontext 308
#define SYS__lwp_create 309
#define SYS__lwp_exit 310
#define SYS__lwp_self 311
#define SYS__lwp_setprivate 317
#define SYS__lwp_kill 318
#define SYS__lwp_unpark 321
#define SYS___sigaction_sigtramp 340
#define SYS_kqueue 344
#define SYS_sched_yield 350
#define SYS___setitimer50 425
#define SYS___clock_gettime50 427
#define SYS___nanosleep50 430
#define SYS___kevent50 435
#define SYS____lwp_park60 478
// Exit the entire program (like C exit)
TEXT runtime·exit(SB),NOSPLIT,$-4
MOVL $SYS_exit, AX
INT $0x80
MOVL $0xf1, 0xf1 // crash
RET
// func exitThread(wait *uint32)
TEXT runtime·exitThread(SB),NOSPLIT,$0-4
MOVL wait+0(FP), AX
// We're done using the stack.
MOVL $0, (AX)
MOVL $SYS__lwp_exit, AX
INT $0x80
MOVL $0xf1, 0xf1 // crash
JMP 0(PC)
TEXT runtime·open(SB),NOSPLIT,$-4
MOVL $SYS_open, AX
INT $0x80
JAE 2(PC)
MOVL $-1, AX
MOVL AX, ret+12(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT,$-4
MOVL $SYS_close, AX
INT $0x80
JAE 2(PC)
MOVL $-1, AX
MOVL AX, ret+4(FP)
RET
TEXT runtime·read(SB),NOSPLIT,$-4
MOVL $SYS_read, AX
INT $0x80
JAE 2(PC)
NEGL AX // caller expects negative errno
MOVL AX, ret+12(FP)
RET
// func pipe() (r, w int32, errno int32)
TEXT runtime·pipe(SB),NOSPLIT,$0-12
MOVL $42, AX
INT $0x80
JCC pipeok
MOVL $-1, r+0(FP)
MOVL $-1, w+4(FP)
MOVL AX, errno+8(FP)
RET
pipeok:
MOVL AX, r+0(FP)
MOVL DX, w+4(FP)
MOVL $0, errno+8(FP)
RET
// func pipe2(flags int32) (r, w int32, errno int32)
TEXT runtime·pipe2(SB),NOSPLIT,$12-16
MOVL $453, AX
LEAL r+4(FP), BX
MOVL BX, 4(SP)
MOVL flags+0(FP), BX
MOVL BX, 8(SP)
INT $0x80
MOVL AX, errno+12(FP)
RET
TEXT runtime·write1(SB),NOSPLIT,$-4
MOVL $SYS_write, AX
INT $0x80
JAE 2(PC)
NEGL AX // caller expects negative errno
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 $SYS___nanosleep50, AX
INT $0x80
RET
TEXT runtime·lwp_kill(SB),NOSPLIT,$12-8
MOVL $0, 0(SP)
MOVL tid+0(FP), AX
MOVL AX, 4(SP) // arg 1 - target
MOVL sig+4(FP), AX
MOVL AX, 8(SP) // arg 2 - signo
MOVL $SYS__lwp_kill, AX
INT $0x80
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$12
MOVL $SYS_getpid, AX
INT $0x80
MOVL $0, 0(SP)
MOVL AX, 4(SP) // arg 1 - pid
MOVL sig+0(FP), AX
MOVL AX, 8(SP) // arg 2 - signo
MOVL $SYS_kill, AX
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 $SYS_mmap, AX
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 $SYS_munmap, AX
INT $0x80
JAE 2(PC)
MOVL $0xf1, 0xf1 // crash
RET
TEXT runtime·madvise(SB),NOSPLIT,$-4
MOVL $SYS_madvise, AX
INT $0x80
JAE 2(PC)
MOVL $-1, AX
MOVL AX, ret+12(FP)
RET
TEXT runtime·setitimer(SB),NOSPLIT,$-4
MOVL $SYS___setitimer50, AX
INT $0x80
RET
// func walltime1() (sec int64, nsec int32)
TEXT runtime·walltime1(SB), NOSPLIT, $32
LEAL 12(SP), BX
MOVL $CLOCK_REALTIME, 4(SP) // arg 1 - clock_id
MOVL BX, 8(SP) // arg 2 - tp
MOVL $SYS___clock_gettime50, AX
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 $SYS___clock_gettime50, AX
INT $0x80
MOVL 16(SP), CX // sec - h32
IMULL $1000000000, CX
MOVL 12(SP), AX // sec - l32
MOVL $1000000000, BX
MULL BX // result in dx:ax
MOVL 20(SP), BX // nsec
ADDL BX, AX
ADCL CX, DX // add high bits with carry
MOVL AX, ret_lo+0(FP)
MOVL DX, ret_hi+4(FP)
RET
TEXT runtime·getcontext(SB),NOSPLIT,$-4
MOVL $SYS_getcontext, AX
INT $0x80
JAE 2(PC)
MOVL $0xf1, 0xf1 // crash
RET
TEXT runtime·sigprocmask(SB),NOSPLIT,$-4
MOVL $SYS___sigprocmask14, AX
INT $0x80
JAE 2(PC)
MOVL $0xf1, 0xf1 // crash
RET
TEXT sigreturn_tramp<>(SB),NOSPLIT,$0
LEAL 140(SP), AX // Load address of ucontext
MOVL AX, 4(SP)
MOVL $SYS_setcontext, AX
INT $0x80
MOVL $-1, 4(SP) // Something failed...
MOVL $SYS_exit, AX
INT $0x80
TEXT runtime·sigaction(SB),NOSPLIT,$24
LEAL sig+0(FP), SI
LEAL 4(SP), DI
CLD
MOVSL // arg 1 - sig
MOVSL // arg 2 - act
MOVSL // arg 3 - oact
LEAL sigreturn_tramp<>(SB), AX
STOSL // arg 4 - tramp
MOVL $2, AX
STOSL // arg 5 - vers
MOVL $SYS___sigaction_sigtramp, AX
INT $0x80
JAE 2(PC)
MOVL $0xf1, 0xf1 // crash
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 lwp_create(void *context, uintptr flags, void *lwpid);
TEXT runtime·lwp_create(SB),NOSPLIT,$16
MOVL $0, 0(SP)
MOVL ctxt+0(FP), AX
MOVL AX, 4(SP) // arg 1 - context
MOVL flags+4(FP), AX
MOVL AX, 8(SP) // arg 2 - flags
MOVL lwpid+8(FP), AX
MOVL AX, 12(SP) // arg 3 - lwpid
MOVL $SYS__lwp_create, AX
INT $0x80
JCC 2(PC)
NEGL AX
MOVL AX, ret+12(FP)
RET
TEXT runtime·lwp_tramp(SB),NOSPLIT,$0
// Set FS to point at m->tls
LEAL m_tls(BX), BP
PUSHAL // save registers
PUSHL BP
CALL lwp_setprivate<>(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 ·netbsdMstart(SB),NOSPLIT|TOPFRAME,$0
CALL ·netbsdMstart0(SB)
RET // not reached
TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
MOVL $SYS___sigaltstack14, AX
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,$8
// Under NetBSD we set the GS base instead of messing with the LDT.
MOVL base+4(FP), AX
MOVL AX, 0(SP)
CALL lwp_setprivate<>(SB)
RET
TEXT lwp_setprivate<>(SB),NOSPLIT,$16
// adjust for ELF: wants to use -4(GS) for g
MOVL base+0(FP), CX
ADDL $4, CX
MOVL $0, 0(SP) // syscall gap
MOVL CX, 4(SP) // arg 1 - ptr
MOVL $SYS__lwp_setprivate, AX
INT $0x80
JCC 2(PC)
MOVL $0xf1, 0xf1 // crash
RET
TEXT runtime·osyield(SB),NOSPLIT,$-4
MOVL $SYS_sched_yield, AX
INT $0x80
RET
TEXT runtime·lwp_park(SB),NOSPLIT,$-4
MOVL $SYS____lwp_park60, AX
INT $0x80
MOVL AX, ret+24(FP)
RET
TEXT runtime·lwp_unpark(SB),NOSPLIT,$-4
MOVL $SYS__lwp_unpark, AX
INT $0x80
MOVL AX, ret+8(FP)
RET
TEXT runtime·lwp_self(SB),NOSPLIT,$-4
MOVL $SYS__lwp_self, AX
INT $0x80
MOVL AX, ret+0(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 $SYS___sysctl, AX
INT $0x80
JAE 4(PC)
NEGL AX
MOVL AX, ret+24(FP)
RET
MOVL $0, AX
MOVL AX, ret+24(FP)
RET
GLOBL runtime·tlsoffset(SB),NOPTR,$4
// int32 runtime·kqueue(void)
TEXT runtime·kqueue(SB),NOSPLIT,$0
MOVL $SYS_kqueue, 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 $SYS___kevent50, AX
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 $SYS_fcntl, AX
// 0(SP) is where the caller PC would be; kernel skips it
MOVL fd+0(FP), BX
MOVL BX, 4(SP) // fd
MOVL $F_SETFD, 8(SP)
MOVL $FD_CLOEXEC, 12(SP)
INT $0x80
JAE 2(PC)
NEGL AX
RET
// func runtime·setNonblock(fd int32)
TEXT runtime·setNonblock(SB),NOSPLIT,$16-4
MOVL $92, AX // fcntl
MOVL fd+0(FP), BX // fd
MOVL BX, 4(SP)
MOVL $3, 8(SP) // F_GETFL
MOVL $0, 12(SP)
INT $0x80
MOVL fd+0(FP), BX // fd
MOVL BX, 4(SP)
MOVL $4, 8(SP) // F_SETFL
ORL $4, AX // O_NONBLOCK
MOVL AX, 12(SP)
MOVL $92, AX // fcntl
INT $0x80
RET
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