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go/src/runtime/sys_nacl_amd64p32.s
Bryan C. Mills 8e43c37229 runtime: make Playground timestamps change when the stream fd changes 
The process reading the output of the binary may read stderr and
stdout separately, and may interleave reads from the two streams
arbitrarily. Because we explicitly serialize writes on the writer
side, we can reuse a timestamp within a single stream without losing
information; however, if we use the same timestamp for write on both
streams, the reader can't tell how to interleave them.

This change ensures that every time we change between the two fds, we
also bump the timestamp. That way, writes within a stream continue to
show the same timestamp, but a sorted merge of the contents of the two
streams always interleaves them in the correct order.

This still requires a corresponding change to the Playground parser to
actually reconstruct the correct interleaving. It currently merges the
two streams without reordering them; it should instead buffer them
separately and perform a sorted merge. (See
https://golang.org/cl/105496.)

Updates golang/go#24615.
Updates golang/go#24659.

Change-Id: Id789dfcc02eb4247906c9ddad38dac50cf829979
Reviewed-on: https://go-review.googlesource.com/105235
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Yury Smolsky <yury@smolsky.by>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-04-11 18:12:02 +00:00

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// Copyright 2013 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.
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
#include "syscall_nacl.h"
#define NACL_SYSCALL(code) \
MOVL $(0x10000 + ((code)<<5)), AX; CALL AX
TEXT runtime·settls(SB),NOSPLIT,$0
MOVL DI, TLS // really BP
RET
TEXT runtime·exit(SB),NOSPLIT,$0
MOVL code+0(FP), DI
NACL_SYSCALL(SYS_exit)
RET
// func exitThread(wait *uint32)
TEXT runtime·exitThread(SB),NOSPLIT,$0-4
MOVL wait+0(FP), DI
// SYS_thread_exit will clear *wait when the stack is free.
NACL_SYSCALL(SYS_thread_exit)
JMP 0(PC)
TEXT runtime·open(SB),NOSPLIT,$0
MOVL name+0(FP), DI
MOVL mode+4(FP), SI
MOVL perm+8(FP), DX
NACL_SYSCALL(SYS_open)
MOVL AX, ret+16(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT,$0
MOVL fd+0(FP), DI
NACL_SYSCALL(SYS_close)
MOVL AX, ret+8(FP)
RET
TEXT runtime·read(SB),NOSPLIT,$0
MOVL fd+0(FP), DI
MOVL p+4(FP), SI
MOVL n+8(FP), DX
NACL_SYSCALL(SYS_read)
MOVL AX, ret+16(FP)
RET
TEXT syscall·naclWrite(SB), NOSPLIT, $24-20
MOVL arg1+0(FP), DI
MOVL arg2+4(FP), SI
MOVL arg3+8(FP), DX
MOVL DI, 0(SP)
MOVL SI, 4(SP)
MOVL DX, 8(SP)
CALL runtime·write(SB)
MOVL 16(SP), AX
MOVL AX, ret+16(FP)
RET
TEXT runtime·write(SB),NOSPLIT,$16-20
// If using fake time and writing to stdout or stderr,
// emit playback header before actual data.
MOVQ runtime·faketime(SB), AX
CMPQ AX, $0
JEQ write
MOVL fd+0(FP), DI
CMPL DI, $1
JEQ playback
CMPL DI, $2
JEQ playback
write:
// Ordinary write.
MOVL fd+0(FP), DI
MOVL p+4(FP), SI
MOVL n+8(FP), DX
NACL_SYSCALL(SYS_write)
MOVL AX, ret+16(FP)
RET
// Write with playback header.
// First, lock to avoid interleaving writes.
playback:
MOVL $1, BX
XCHGL runtime·writelock(SB), BX
CMPL BX, $0
JNE playback
MOVQ runtime·lastfaketime(SB), CX
MOVL runtime·lastfaketimefd(SB), BX
CMPL DI, BX
JE samefd
// If the current fd doesn't match the fd of the previous write,
// ensure that the timestamp is strictly greater. That way, we can
// recover the original order even if we read the fds separately.
INCQ CX
MOVL DI, runtime·lastfaketimefd(SB)
samefd:
CMPQ AX, CX
CMOVQLT CX, AX
MOVQ AX, runtime·lastfaketime(SB)
// Playback header: 0 0 P B <8-byte time> <4-byte data length>
MOVL $(('B'<<24) | ('P'<<16)), 0(SP)
BSWAPQ AX
MOVQ AX, 4(SP)
MOVL n+8(FP), DX
BSWAPL DX
MOVL DX, 12(SP)
MOVL fd+0(FP), DI
MOVL SP, SI
MOVL $16, DX
NACL_SYSCALL(SYS_write)
// Write actual data.
MOVL fd+0(FP), DI
MOVL p+4(FP), SI
MOVL n+8(FP), DX
NACL_SYSCALL(SYS_write)
// Unlock.
MOVL $0, runtime·writelock(SB)
MOVL AX, ret+16(FP)
RET
TEXT runtime·nacl_exception_stack(SB),NOSPLIT,$0
MOVL p+0(FP), DI
MOVL size+4(FP), SI
NACL_SYSCALL(SYS_exception_stack)
MOVL AX, ret+8(FP)
RET
TEXT runtime·nacl_exception_handler(SB),NOSPLIT,$0
MOVL fn+0(FP), DI
MOVL arg+4(FP), SI
NACL_SYSCALL(SYS_exception_handler)
MOVL AX, ret+8(FP)
RET
TEXT runtime·nacl_sem_create(SB),NOSPLIT,$0
MOVL flag+0(FP), DI
NACL_SYSCALL(SYS_sem_create)
MOVL AX, ret+8(FP)
RET
TEXT runtime·nacl_sem_wait(SB),NOSPLIT,$0
MOVL sem+0(FP), DI
NACL_SYSCALL(SYS_sem_wait)
MOVL AX, ret+8(FP)
RET
TEXT runtime·nacl_sem_post(SB),NOSPLIT,$0
MOVL sem+0(FP), DI
NACL_SYSCALL(SYS_sem_post)
MOVL AX, ret+8(FP)
RET
TEXT runtime·nacl_mutex_create(SB),NOSPLIT,$0
MOVL flag+0(FP), DI
NACL_SYSCALL(SYS_mutex_create)
MOVL AX, ret+8(FP)
RET
TEXT runtime·nacl_mutex_lock(SB),NOSPLIT,$0
MOVL mutex+0(FP), DI
NACL_SYSCALL(SYS_mutex_lock)
MOVL AX, ret+8(FP)
RET
TEXT runtime·nacl_mutex_trylock(SB),NOSPLIT,$0
MOVL mutex+0(FP), DI
NACL_SYSCALL(SYS_mutex_trylock)
MOVL AX, ret+8(FP)
RET
TEXT runtime·nacl_mutex_unlock(SB),NOSPLIT,$0
MOVL mutex+0(FP), DI
NACL_SYSCALL(SYS_mutex_unlock)
MOVL AX, ret+8(FP)
RET
TEXT runtime·nacl_cond_create(SB),NOSPLIT,$0
MOVL flag+0(FP), DI
NACL_SYSCALL(SYS_cond_create)
MOVL AX, ret+8(FP)
RET
TEXT runtime·nacl_cond_wait(SB),NOSPLIT,$0
MOVL cond+0(FP), DI
MOVL n+4(FP), SI
NACL_SYSCALL(SYS_cond_wait)
MOVL AX, ret+8(FP)
RET
TEXT runtime·nacl_cond_signal(SB),NOSPLIT,$0
MOVL cond+0(FP), DI
NACL_SYSCALL(SYS_cond_signal)
MOVL AX, ret+8(FP)
RET
TEXT runtime·nacl_cond_broadcast(SB),NOSPLIT,$0
MOVL cond+0(FP), DI
NACL_SYSCALL(SYS_cond_broadcast)
MOVL AX, ret+8(FP)
RET
TEXT runtime·nacl_cond_timed_wait_abs(SB),NOSPLIT,$0
MOVL cond+0(FP), DI
MOVL lock+4(FP), SI
MOVL ts+8(FP), DX
NACL_SYSCALL(SYS_cond_timed_wait_abs)
MOVL AX, ret+16(FP)
RET
TEXT runtime·nacl_thread_create(SB),NOSPLIT,$0
MOVL fn+0(FP), DI
MOVL stk+4(FP), SI
MOVL tls+8(FP), DX
MOVL xx+12(FP), CX
NACL_SYSCALL(SYS_thread_create)
MOVL AX, ret+16(FP)
RET
TEXT runtime·mstart_nacl(SB),NOSPLIT,$0
NACL_SYSCALL(SYS_tls_get)
SUBL $8, AX
MOVL AX, TLS
JMP runtime·mstart(SB)
TEXT runtime·nacl_nanosleep(SB),NOSPLIT,$0
MOVL ts+0(FP), DI
MOVL extra+4(FP), SI
NACL_SYSCALL(SYS_nanosleep)
MOVL AX, ret+8(FP)
RET
TEXT runtime·osyield(SB),NOSPLIT,$0
NACL_SYSCALL(SYS_sched_yield)
RET
TEXT runtime·mmap(SB),NOSPLIT,$8
MOVL addr+0(FP), DI
MOVL n+4(FP), SI
MOVL prot+8(FP), DX
MOVL flags+12(FP), CX
MOVL fd+16(FP), R8
MOVL off+20(FP), AX
MOVQ AX, 0(SP)
MOVL SP, R9
NACL_SYSCALL(SYS_mmap)
CMPL AX, $-4095
JNA ok
NEGL AX
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·walltime(SB),NOSPLIT,$16
MOVQ runtime·faketime(SB), AX
CMPQ AX, $0
JEQ realtime
MOVQ $0, DX
MOVQ $1000000000, CX
DIVQ CX
MOVQ AX, sec+0(FP)
MOVL DX, nsec+8(FP)
RET
realtime:
MOVL $0, DI // real time clock
LEAL 0(SP), AX
MOVL AX, SI // timespec
NACL_SYSCALL(SYS_clock_gettime)
MOVL 0(SP), AX // low 32 sec
MOVL 4(SP), CX // high 32 sec
MOVL 8(SP), BX // nsec
// sec is in AX, nsec in BX
MOVL AX, sec_lo+0(FP)
MOVL CX, sec_hi+4(FP)
MOVL BX, nsec+8(FP)
RET
TEXT syscall·now(SB),NOSPLIT,$0
JMP runtime·walltime(SB)
TEXT runtime·nacl_clock_gettime(SB),NOSPLIT,$0
MOVL arg1+0(FP), DI
MOVL arg2+4(FP), SI
NACL_SYSCALL(SYS_clock_gettime)
MOVL AX, ret+8(FP)
RET
TEXT runtime·nanotime(SB),NOSPLIT,$16
MOVQ runtime·faketime(SB), AX
CMPQ AX, $0
JEQ 3(PC)
MOVQ AX, ret+0(FP)
RET
MOVL $0, DI // real time clock
LEAL 0(SP), AX
MOVL AX, SI // timespec
NACL_SYSCALL(SYS_clock_gettime)
MOVQ 0(SP), AX // sec
MOVL 8(SP), DX // nsec
// sec is in AX, nsec in DX
// return nsec in AX
IMULQ $1000000000, AX
ADDQ DX, AX
MOVQ AX, ret+0(FP)
RET
TEXT runtime·sigtramp(SB),NOSPLIT,$80
// restore TLS register at time of execution,
// in case it's been smashed.
// the TLS register is really BP, but for consistency
// with non-NaCl systems it is referred to here as TLS.
// NOTE: Cannot use SYS_tls_get here (like we do in mstart_nacl),
// because the main thread never calls tls_set.
LEAL ctxt+0(FP), AX
MOVL (16*4+5*8)(AX), AX
MOVL AX, TLS
// check that g exists
get_tls(CX)
MOVL g(CX), DI
CMPL DI, $0
JEQ nog
// save g
MOVL DI, 20(SP)
// g = m->gsignal
MOVL g_m(DI), BX
MOVL m_gsignal(BX), BX
MOVL BX, g(CX)
//JMP debughandler
// copy arguments for sighandler
MOVL $11, 0(SP) // signal
MOVL $0, 4(SP) // siginfo
LEAL ctxt+0(FP), AX
MOVL AX, 8(SP) // context
MOVL DI, 12(SP) // g
CALL runtime·sighandler(SB)
// restore g
get_tls(CX)
MOVL 20(SP), BX
MOVL BX, g(CX)
// Enable exceptions again.
NACL_SYSCALL(SYS_exception_clear_flag)
// Restore registers as best we can. Impossible to do perfectly.
// See comment in sys_nacl_386.s for extended rationale.
LEAL ctxt+0(FP), SI
ADDL $64, SI
MOVQ 0(SI), AX
MOVQ 8(SI), CX
MOVQ 16(SI), DX
MOVQ 24(SI), BX
MOVL 32(SI), SP // MOVL for SP sandboxing
// 40(SI) is saved BP aka TLS, already restored above
// 48(SI) is saved SI, never to be seen again
MOVQ 56(SI), DI
MOVQ 64(SI), R8
MOVQ 72(SI), R9
MOVQ 80(SI), R10
MOVQ 88(SI), R11
MOVQ 96(SI), R12
MOVQ 104(SI), R13
MOVQ 112(SI), R14
// 120(SI) is R15, which is owned by Native Client and must not be modified
MOVQ 128(SI), SI // saved PC
// 136(SI) is saved EFLAGS, never to be seen again
JMP SI
//debughandler:
//// print basic information
//LEAL ctxt+0(FP), DI
//MOVL $runtime·sigtrampf(SB), AX
//MOVL AX, 0(SP)
//MOVQ (16*4+16*8)(DI), BX // rip
//MOVQ BX, 8(SP)
//MOVQ (16*4+0*8)(DI), BX // rax
//MOVQ BX, 16(SP)
//MOVQ (16*4+1*8)(DI), BX // rcx
//MOVQ BX, 24(SP)
//MOVQ (16*4+2*8)(DI), BX // rdx
//MOVQ BX, 32(SP)
//MOVQ (16*4+3*8)(DI), BX // rbx
//MOVQ BX, 40(SP)
//MOVQ (16*4+7*8)(DI), BX // rdi
//MOVQ BX, 48(SP)
//MOVQ (16*4+15*8)(DI), BX // r15
//MOVQ BX, 56(SP)
//MOVQ (16*4+4*8)(DI), BX // rsp
//MOVQ 0(BX), BX
//MOVQ BX, 64(SP)
//CALL runtime·printf(SB)
//
//LEAL ctxt+0(FP), DI
//MOVQ (16*4+16*8)(DI), BX // rip
//MOVL BX, 0(SP)
//MOVQ (16*4+4*8)(DI), BX // rsp
//MOVL BX, 4(SP)
//MOVL $0, 8(SP) // lr
//get_tls(CX)
//MOVL g(CX), BX
//MOVL BX, 12(SP) // gp
//CALL runtime·traceback(SB)
notls:
MOVL 0, AX
RET
nog:
MOVL 0, AX
RET
// cannot do real signal handling yet, because gsignal has not been allocated.
MOVL $1, DI; NACL_SYSCALL(SYS_exit)
// func getRandomData([]byte)
TEXT runtime·getRandomData(SB),NOSPLIT,$0-12
MOVL arg_base+0(FP), DI
MOVL arg_len+4(FP), SI
NACL_SYSCALL(SYS_get_random_bytes)
RET
TEXT runtime·nacl_sysinfo(SB),NOSPLIT,$16
/*
MOVL di+0(FP), DI
LEAL 12(DI), BX
MOVL 8(DI), AX
ADDL 4(DI), AX
ADDL $2, AX
LEAL (BX)(AX*4), BX
MOVL BX, runtime·nacl_irt_query(SB)
auxloop:
MOVL 0(BX), DX
CMPL DX, $0
JNE 2(PC)
RET
CMPL DX, $32
JEQ auxfound
ADDL $8, BX
JMP auxloop
auxfound:
MOVL 4(BX), BX
MOVL BX, runtime·nacl_irt_query(SB)
LEAL runtime·nacl_irt_basic_v0_1_str(SB), DI
LEAL runtime·nacl_irt_basic_v0_1(SB), SI
MOVL runtime·nacl_irt_basic_v0_1_size(SB), DX
MOVL runtime·nacl_irt_query(SB), BX
CALL BX
LEAL runtime·nacl_irt_memory_v0_3_str(SB), DI
LEAL runtime·nacl_irt_memory_v0_3(SB), SI
MOVL runtime·nacl_irt_memory_v0_3_size(SB), DX
MOVL runtime·nacl_irt_query(SB), BX
CALL BX
LEAL runtime·nacl_irt_thread_v0_1_str(SB), DI
LEAL runtime·nacl_irt_thread_v0_1(SB), SI
MOVL runtime·nacl_irt_thread_v0_1_size(SB), DX
MOVL runtime·nacl_irt_query(SB), BX
CALL BX
// TODO: Once we have a NaCl SDK with futex syscall support,
// try switching to futex syscalls and here load the
// nacl-irt-futex-0.1 table.
*/
RET
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