src/runtime/sys_nacl_amd64p32.s - go - Git at Google

 // 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

 TEXT runtime·exit1(SB),NOSPLIT,$0
 	MOVL code+0(FP), DI
 	NACL_SYSCALL(SYS_thread_exit)
 	RET

 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

 	// 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 2(PC)
 	NEGL AX
 	MOVL	AX, ret+24(FP)
 	RET

 TEXT time·now(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+0(FP)
 	MOVL	CX, sec+4(FP)
 	MOVL	BX, nsec+8(FP)
 	RET

 TEXT syscall·now(SB),NOSPLIT,$0
 	JMP time·now(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
	// 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

	TEXT runtime·exit1(SB),NOSPLIT,$0
	MOVL code+0(FP), DI
	NACL_SYSCALL(SYS_thread_exit)
	RET

	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

	// 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 2(PC)
	NEGL AX
	MOVL AX, ret+24(FP)
	RET

	TEXT time·now(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+0(FP)
	MOVL CX, sec+4(FP)
	MOVL BX, nsec+8(FP)
	RET

	TEXT syscall·now(SB),NOSPLIT,$0
	JMP time·now(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 (164+58)(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 (164+168)(DI), BX // rip
	MOVQ BX, 8(SP)
	MOVQ (164+08)(DI), BX // rax
	MOVQ BX, 16(SP)
	MOVQ (164+18)(DI), BX // rcx
	MOVQ BX, 24(SP)
	MOVQ (164+28)(DI), BX // rdx
	MOVQ BX, 32(SP)
	MOVQ (164+38)(DI), BX // rbx
	MOVQ BX, 40(SP)
	MOVQ (164+78)(DI), BX // rdi
	MOVQ BX, 48(SP)
	MOVQ (164+158)(DI), BX // r15
	MOVQ BX, 56(SP)
	MOVQ (164+48)(DI), BX // rsp
	MOVQ 0(BX), BX
	MOVQ BX, 64(SP)
	CALL runtime·printf(SB)

	LEAL ctxt+0(FP), DI
	MOVQ (164+168)(DI), BX // rip
	MOVL BX, 0(SP)
	MOVQ (164+48)(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