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sys_nacl_arm.s
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// Copyright 2014 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) \
MOVW $(0x10000 + ((code)<<5)), R8; BL (R8)
TEXT runtime·exit(SB),NOSPLIT,$0
MOVW code+0(FP), R0
NACL_SYSCALL(SYS_exit)
RET
TEXT runtime·exit1(SB),NOSPLIT,$0
MOVW code+0(FP), R0
NACL_SYSCALL(SYS_thread_exit)
RET
TEXT runtime·open(SB),NOSPLIT,$0
MOVW name+0(FP), R0
MOVW name+0(FP), R1
MOVW name+0(FP), R2
NACL_SYSCALL(SYS_open)
MOVW R0, ret+12(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT,$0
MOVW fd+0(FP), R0
NACL_SYSCALL(SYS_close)
MOVW R0, ret+4(FP)
RET
TEXT runtime·read(SB),NOSPLIT,$0
MOVW fd+0(FP), R0
MOVW p+4(FP), R1
MOVW n+8(FP), R2
NACL_SYSCALL(SYS_read)
MOVW R0, ret+12(FP)
RET
// func naclWrite(fd int, b []byte) int
TEXT syscall·naclWrite(SB),NOSPLIT,$0
MOVW arg1+0(FP), R0
MOVW arg2+4(FP), R1
MOVW arg3+8(FP), R2
NACL_SYSCALL(SYS_write)
MOVW R0, ret+16(FP)
RET
TEXT runtime·write(SB),NOSPLIT,$0
MOVW fd+0(FP), R0
MOVW p+4(FP), R1
MOVW n+8(FP), R2
NACL_SYSCALL(SYS_write)
MOVW R0, ret+12(FP)
RET
TEXT runtime·nacl_exception_stack(SB),NOSPLIT,$0
MOVW p+0(FP), R0
MOVW size+4(FP), R1
NACL_SYSCALL(SYS_exception_stack)
MOVW R0, ret+8(FP)
RET
TEXT runtime·nacl_exception_handler(SB),NOSPLIT,$0
MOVW fn+0(FP), R0
MOVW arg+4(FP), R1
NACL_SYSCALL(SYS_exception_handler)
MOVW R0, ret+8(FP)
RET
TEXT runtime·nacl_sem_create(SB),NOSPLIT,$0
MOVW flag+0(FP), R0
NACL_SYSCALL(SYS_sem_create)
MOVW R0, ret+4(FP)
RET
TEXT runtime·nacl_sem_wait(SB),NOSPLIT,$0
MOVW sem+0(FP), R0
NACL_SYSCALL(SYS_sem_wait)
MOVW R0, ret+4(FP)
RET
TEXT runtime·nacl_sem_post(SB),NOSPLIT,$0
MOVW sem+0(FP), R0
NACL_SYSCALL(SYS_sem_post)
MOVW R0, ret+4(FP)
RET
TEXT runtime·nacl_mutex_create(SB),NOSPLIT,$0
MOVW flag+0(FP), R0
NACL_SYSCALL(SYS_mutex_create)
MOVW R0, ret+4(FP)
RET
TEXT runtime·nacl_mutex_lock(SB),NOSPLIT,$0
MOVW mutex+0(FP), R0
NACL_SYSCALL(SYS_mutex_lock)
MOVW R0, ret+4(FP)
RET
TEXT runtime·nacl_mutex_trylock(SB),NOSPLIT,$0
MOVW mutex+0(FP), R0
NACL_SYSCALL(SYS_mutex_trylock)
MOVW R0, ret+4(FP)
RET
TEXT runtime·nacl_mutex_unlock(SB),NOSPLIT,$0
MOVW mutex+0(FP), R0
NACL_SYSCALL(SYS_mutex_unlock)
MOVW R0, ret+4(FP)
RET
TEXT runtime·nacl_cond_create(SB),NOSPLIT,$0
MOVW flag+0(FP), R0
NACL_SYSCALL(SYS_cond_create)
MOVW R0, ret+4(FP)
RET
TEXT runtime·nacl_cond_wait(SB),NOSPLIT,$0
MOVW cond+0(FP), R0
MOVW n+4(FP), R1
NACL_SYSCALL(SYS_cond_wait)
MOVW R0, ret+8(FP)
RET
TEXT runtime·nacl_cond_signal(SB),NOSPLIT,$0
MOVW cond+0(FP), R0
NACL_SYSCALL(SYS_cond_signal)
MOVW R0, ret+4(FP)
RET
TEXT runtime·nacl_cond_broadcast(SB),NOSPLIT,$0
MOVW cond+0(FP), R0
NACL_SYSCALL(SYS_cond_broadcast)
MOVW R0, ret+4(FP)
RET
TEXT runtime·nacl_cond_timed_wait_abs(SB),NOSPLIT,$0
MOVW cond+0(FP), R0
MOVW lock+4(FP), R1
MOVW ts+8(FP), R2
NACL_SYSCALL(SYS_cond_timed_wait_abs)
MOVW R0, ret+12(FP)
RET
TEXT runtime·nacl_thread_create(SB),NOSPLIT,$0
MOVW fn+0(FP), R0
MOVW stk+4(FP), R1
MOVW tls+8(FP), R2
MOVW xx+12(FP), R3
NACL_SYSCALL(SYS_thread_create)
MOVW R0, ret+16(FP)
RET
TEXT runtime·mstart_nacl(SB),NOSPLIT,$0
MOVW 0(R9), R0 // TLS
MOVW -8(R0), R1 // g
MOVW -4(R0), R2 // m
MOVW R2, g_m(R1)
MOVW R1, g
B runtime·mstart(SB)
TEXT runtime·nacl_nanosleep(SB),NOSPLIT,$0
MOVW ts+0(FP), R0
MOVW extra+4(FP), R1
NACL_SYSCALL(SYS_nanosleep)
MOVW R0, ret+8(FP)
RET
TEXT runtime·osyield(SB),NOSPLIT,$0
NACL_SYSCALL(SYS_sched_yield)
RET
TEXT runtime·mmap(SB),NOSPLIT,$8
MOVW addr+0(FP), R0
MOVW n+4(FP), R1
MOVW prot+8(FP), R2
MOVW flags+12(FP), R3
MOVW fd+16(FP), R4
// arg6:offset should be passed as a pointer (to int64)
MOVW off+20(FP), R5
MOVW R5, 4(R13)
MOVW $0, R6
MOVW R6, 8(R13)
MOVW $4(R13), R5
MOVM.DB.W [R4,R5], (R13) // arg5 and arg6 are passed on stack
NACL_SYSCALL(SYS_mmap)
MOVM.IA.W (R13), [R4, R5]
CMP $-4095, R0
RSB.HI $0, R0
MOVW R0, ret+24(FP)
RET
TEXT time·now(SB),NOSPLIT,$16
MOVW $0, R0 // real time clock
MOVW $4(R13), R1
NACL_SYSCALL(SYS_clock_gettime)
MOVW 4(R13), R0 // low 32-bit sec
MOVW 8(R13), R1 // high 32-bit sec
MOVW 12(R13), R2 // nsec
MOVW R0, sec+0(FP)
MOVW R1, sec+4(FP)
MOVW R2, sec+8(FP)
RET
TEXT syscall·now(SB),NOSPLIT,$0
B time·now(SB)
TEXT runtime·nacl_clock_gettime(SB),NOSPLIT,$0
MOVW arg1+0(FP), R0
MOVW arg2+4(FP), R1
NACL_SYSCALL(SYS_clock_gettime)
MOVW R0, ret+8(FP)
RET
// int64 nanotime(void) so really
// void nanotime(int64 *nsec)
TEXT runtime·nanotime(SB),NOSPLIT,$16
MOVW $0, R0 // real time clock
MOVW $4(R13), R1
NACL_SYSCALL(SYS_clock_gettime)
MOVW 4(R13), R0 // low 32-bit sec
MOVW 8(R13), R1 // high 32-bit sec (ignored for now)
MOVW 12(R13), R2 // nsec
MOVW $1000000000, R3
MULLU R0, R3, (R1, R0)
MOVW $0, R4
ADD.S R2, R0
ADC R4, R1
MOVW R0, ret_lo+0(FP)
MOVW R1, ret_hi+4(FP)
RET
TEXT runtime·sigtramp(SB),NOSPLIT,$80
// load g from thread context
MOVW $ctxt+-4(FP), R0
MOVW (16*4+10*4)(R0), g
// check that g exists
CMP $0, g
BNE 4(PC)
MOVW $runtime·badsignal2(SB), R11
BL (R11)
RET
// save g
MOVW g, R3
MOVW g, 20(R13)
// g = m->gsignal
MOVW g_m(g), R8
MOVW m_gsignal(R8), g
// copy arguments for call to sighandler
MOVW $11, R0
MOVW R0, 4(R13) // signal
MOVW $0, R0
MOVW R0, 8(R13) // siginfo
MOVW $ctxt+-4(FP), R0
MOVW R0, 12(R13) // context
MOVW R3, 16(R13) // g
BL runtime·sighandler(SB)
// restore g
MOVW 20(R13), g
// 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.
MOVW $ctxt+-4(FP), R1
ADD $64, R1
MOVW (0*4)(R1), R0
MOVW (2*4)(R1), R2
MOVW (3*4)(R1), R3
MOVW (4*4)(R1), R4
MOVW (5*4)(R1), R5
MOVW (6*4)(R1), R6
MOVW (7*4)(R1), R7
MOVW (8*4)(R1), R8
// cannot write to R9
MOVW (10*4)(R1), g
MOVW (11*4)(R1), R11
MOVW (12*4)(R1), R12
MOVW (13*4)(R1), R13
MOVW (14*4)(R1), R14
MOVW (15*4)(R1), R1
B (R1)
nog:
MOVW $0, R0
RET
TEXT runtime·nacl_sysinfo(SB),NOSPLIT,$16
RET
// func getRandomData([]byte)
TEXT runtime·getRandomData(SB),NOSPLIT,$0-12
MOVW buf+0(FP), R0
MOVW len+4(FP), R1
NACL_SYSCALL(SYS_get_random_bytes)
RET
TEXT runtime·casp1(SB),NOSPLIT,$0
B runtime·cas(SB)
// This is only valid for ARMv6+, however, NaCl/ARM is only defined
// for ARMv7A anyway.
// bool armcas(int32 *val, int32 old, int32 new)
// AtomiBLy:
// if(*val == old){
// *val = new;
// return 1;
// }else
// return 0;
TEXT runtime·cas(SB),NOSPLIT,$0
B runtime·armcas(SB)
// Likewise, this is only valid for ARMv7+, but that's okay.
TEXT ·publicationBarrier(SB),NOSPLIT,$-4-0
B runtime·armPublicationBarrier(SB)
TEXT runtime·read_tls_fallback(SB),NOSPLIT,$-4
WORD $0xe7fedef0 // NACL_INSTR_ARM_ABORT_NOW (UDF #0xEDE0)