mirror of
https://github.com/golang/go
synced 2024-11-19 13:04:45 -07:00
a046caa1e8
This replaces frame size -4 with the NOFRAME flag in arm assembly. This was automated with: sed -i -e 's/\(^TEXT.*[A-Z]\),\( *\)\$-4/\1|NOFRAME,\2$0/' $(find -name '*_arm.s') Plus three manual comment changes found by: grep '\$-4' $(find -name '*_arm.s') The go binary is identical before and after this change. Change-Id: I0310384d1a584118c41d1cd3a042bb8ea7227ef9 Reviewed-on: https://go-review.googlesource.com/92042 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>
321 lines
7.0 KiB
ArmAsm
321 lines
7.0 KiB
ArmAsm
// Copyright 2015 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"
|
|
|
|
// from ../syscall/zsysnum_plan9.go
|
|
|
|
#define SYS_SYSR1 0
|
|
#define SYS_BIND 2
|
|
#define SYS_CHDIR 3
|
|
#define SYS_CLOSE 4
|
|
#define SYS_DUP 5
|
|
#define SYS_ALARM 6
|
|
#define SYS_EXEC 7
|
|
#define SYS_EXITS 8
|
|
#define SYS_FAUTH 10
|
|
#define SYS_SEGBRK 12
|
|
#define SYS_OPEN 14
|
|
#define SYS_OSEEK 16
|
|
#define SYS_SLEEP 17
|
|
#define SYS_RFORK 19
|
|
#define SYS_PIPE 21
|
|
#define SYS_CREATE 22
|
|
#define SYS_FD2PATH 23
|
|
#define SYS_BRK_ 24
|
|
#define SYS_REMOVE 25
|
|
#define SYS_NOTIFY 28
|
|
#define SYS_NOTED 29
|
|
#define SYS_SEGATTACH 30
|
|
#define SYS_SEGDETACH 31
|
|
#define SYS_SEGFREE 32
|
|
#define SYS_SEGFLUSH 33
|
|
#define SYS_RENDEZVOUS 34
|
|
#define SYS_UNMOUNT 35
|
|
#define SYS_SEMACQUIRE 37
|
|
#define SYS_SEMRELEASE 38
|
|
#define SYS_SEEK 39
|
|
#define SYS_FVERSION 40
|
|
#define SYS_ERRSTR 41
|
|
#define SYS_STAT 42
|
|
#define SYS_FSTAT 43
|
|
#define SYS_WSTAT 44
|
|
#define SYS_FWSTAT 45
|
|
#define SYS_MOUNT 46
|
|
#define SYS_AWAIT 47
|
|
#define SYS_PREAD 50
|
|
#define SYS_PWRITE 51
|
|
#define SYS_TSEMACQUIRE 52
|
|
#define SYS_NSEC 53
|
|
|
|
//func open(name *byte, mode, perm int32) int32
|
|
TEXT runtime·open(SB),NOSPLIT,$0-16
|
|
MOVW $SYS_OPEN, R0
|
|
SWI $0
|
|
MOVW R0, ret+12(FP)
|
|
RET
|
|
|
|
//func pread(fd int32, buf unsafe.Pointer, nbytes int32, offset int64) int32
|
|
TEXT runtime·pread(SB),NOSPLIT,$0-24
|
|
MOVW $SYS_PREAD, R0
|
|
SWI $0
|
|
MOVW R0, ret+20(FP)
|
|
RET
|
|
|
|
//func pwrite(fd int32, buf unsafe.Pointer, nbytes int32, offset int64) int32
|
|
TEXT runtime·pwrite(SB),NOSPLIT,$0-24
|
|
MOVW $SYS_PWRITE, R0
|
|
SWI $0
|
|
MOVW R0, ret+20(FP)
|
|
RET
|
|
|
|
//func seek(fd int32, offset int64, whence int32) int64
|
|
TEXT runtime·seek(SB),NOSPLIT,$0-24
|
|
MOVW $ret_lo+16(FP), R0
|
|
MOVW 0(R13), R1
|
|
MOVW R0, 0(R13)
|
|
MOVW.W R1, -4(R13)
|
|
MOVW $SYS_SEEK, R0
|
|
SWI $0
|
|
MOVW.W R1, 4(R13)
|
|
CMP $-1, R0
|
|
MOVW.EQ R0, ret_lo+16(FP)
|
|
MOVW.EQ R0, ret_hi+20(FP)
|
|
RET
|
|
|
|
//func closefd(fd int32) int32
|
|
TEXT runtime·closefd(SB),NOSPLIT,$0-8
|
|
MOVW $SYS_CLOSE, R0
|
|
SWI $0
|
|
MOVW R0, ret+4(FP)
|
|
RET
|
|
|
|
//func exits(msg *byte)
|
|
TEXT runtime·exits(SB),NOSPLIT,$0-4
|
|
MOVW $SYS_EXITS, R0
|
|
SWI $0
|
|
RET
|
|
|
|
//func brk_(addr unsafe.Pointer) int32
|
|
TEXT runtime·brk_(SB),NOSPLIT,$0-8
|
|
MOVW $SYS_BRK_, R0
|
|
SWI $0
|
|
MOVW R0, ret+4(FP)
|
|
RET
|
|
|
|
//func sleep(ms int32) int32
|
|
TEXT runtime·sleep(SB),NOSPLIT,$0-8
|
|
MOVW $SYS_SLEEP, R0
|
|
SWI $0
|
|
MOVW R0, ret+4(FP)
|
|
RET
|
|
|
|
//func plan9_semacquire(addr *uint32, block int32) int32
|
|
TEXT runtime·plan9_semacquire(SB),NOSPLIT,$0-12
|
|
MOVW $SYS_SEMACQUIRE, R0
|
|
SWI $0
|
|
MOVW R0, ret+8(FP)
|
|
RET
|
|
|
|
//func plan9_tsemacquire(addr *uint32, ms int32) int32
|
|
TEXT runtime·plan9_tsemacquire(SB),NOSPLIT,$0-12
|
|
MOVW $SYS_TSEMACQUIRE, R0
|
|
SWI $0
|
|
MOVW R0, ret+8(FP)
|
|
RET
|
|
|
|
//func nsec(*int64) int64
|
|
TEXT runtime·nsec(SB),NOSPLIT|NOFRAME,$0-12
|
|
MOVW $SYS_NSEC, R0
|
|
SWI $0
|
|
MOVW arg+0(FP), R1
|
|
MOVW 0(R1), R0
|
|
MOVW R0, ret_lo+4(FP)
|
|
MOVW 4(R1), R0
|
|
MOVW R0, ret_hi+8(FP)
|
|
RET
|
|
|
|
// time.now() (sec int64, nsec int32)
|
|
TEXT runtime·walltime(SB),NOSPLIT,$12-12
|
|
// use nsec system call to get current time in nanoseconds
|
|
MOVW $sysnsec_lo-8(SP), R0 // destination addr
|
|
MOVW R0,res-12(SP)
|
|
MOVW $SYS_NSEC, R0
|
|
SWI $0
|
|
MOVW sysnsec_lo-8(SP), R1 // R1:R2 = nsec
|
|
MOVW sysnsec_hi-4(SP), R2
|
|
|
|
// multiply nanoseconds by reciprocal of 10**9 (scaled by 2**61)
|
|
// to get seconds (96 bit scaled result)
|
|
MOVW $0x89705f41, R3 // 2**61 * 10**-9
|
|
MULLU R1,R3,(R6,R5) // R5:R6:R7 = R1:R2 * R3
|
|
MOVW $0,R7
|
|
MULALU R2,R3,(R7,R6)
|
|
|
|
// unscale by discarding low 32 bits, shifting the rest by 29
|
|
MOVW R6>>29,R6 // R6:R7 = (R5:R6:R7 >> 61)
|
|
ORR R7<<3,R6
|
|
MOVW R7>>29,R7
|
|
|
|
// subtract (10**9 * sec) from nsec to get nanosecond remainder
|
|
MOVW $1000000000, R5 // 10**9
|
|
MULLU R6,R5,(R9,R8) // R8:R9 = R6:R7 * R5
|
|
MULA R7,R5,R9,R9
|
|
SUB.S R8,R1 // R1:R2 -= R8:R9
|
|
SBC R9,R2
|
|
|
|
// because reciprocal was a truncated repeating fraction, quotient
|
|
// may be slightly too small -- adjust to make remainder < 10**9
|
|
CMP R5,R1 // if remainder > 10**9
|
|
SUB.HS R5,R1 // remainder -= 10**9
|
|
ADD.HS $1,R6 // sec += 1
|
|
|
|
MOVW R6,sec_lo+0(FP)
|
|
MOVW R7,sec_hi+4(FP)
|
|
MOVW R1,nsec+8(FP)
|
|
RET
|
|
|
|
//func notify(fn unsafe.Pointer) int32
|
|
TEXT runtime·notify(SB),NOSPLIT,$0-8
|
|
MOVW $SYS_NOTIFY, R0
|
|
SWI $0
|
|
MOVW R0, ret+4(FP)
|
|
RET
|
|
|
|
//func noted(mode int32) int32
|
|
TEXT runtime·noted(SB),NOSPLIT,$0-8
|
|
MOVW $SYS_NOTED, R0
|
|
SWI $0
|
|
MOVW R0, ret+4(FP)
|
|
RET
|
|
|
|
//func plan9_semrelease(addr *uint32, count int32) int32
|
|
TEXT runtime·plan9_semrelease(SB),NOSPLIT,$0-12
|
|
MOVW $SYS_SEMRELEASE, R0
|
|
SWI $0
|
|
MOVW R0, ret+8(FP)
|
|
RET
|
|
|
|
//func rfork(flags int32) int32
|
|
TEXT runtime·rfork(SB),NOSPLIT,$0-8
|
|
MOVW $SYS_RFORK, R0
|
|
SWI $0
|
|
MOVW R0, ret+4(FP)
|
|
RET
|
|
|
|
//func tstart_plan9(newm *m)
|
|
TEXT runtime·tstart_plan9(SB),NOSPLIT,$4-4
|
|
MOVW newm+0(FP), R1
|
|
MOVW m_g0(R1), g
|
|
|
|
// Layout new m scheduler stack on os stack.
|
|
MOVW R13, R0
|
|
MOVW R0, g_stack+stack_hi(g)
|
|
SUB $(64*1024), R0
|
|
MOVW R0, (g_stack+stack_lo)(g)
|
|
MOVW R0, g_stackguard0(g)
|
|
MOVW R0, g_stackguard1(g)
|
|
|
|
// Initialize procid from TOS struct.
|
|
MOVW _tos(SB), R0
|
|
MOVW 48(R0), R0
|
|
MOVW R0, m_procid(R1) // save pid as m->procid
|
|
|
|
BL runtime·mstart(SB)
|
|
|
|
// Exit the thread.
|
|
MOVW $0, R0
|
|
MOVW R0, 4(R13)
|
|
CALL runtime·exits(SB)
|
|
JMP 0(PC)
|
|
|
|
//func sigtramp(ureg, note unsafe.Pointer)
|
|
TEXT runtime·sigtramp(SB),NOSPLIT,$0-8
|
|
// check that g and m exist
|
|
CMP $0, g
|
|
BEQ 4(PC)
|
|
MOVW g_m(g), R0
|
|
CMP $0, R0
|
|
BNE 2(PC)
|
|
BL runtime·badsignal2(SB) // will exit
|
|
|
|
// save args
|
|
MOVW ureg+0(FP), R1
|
|
MOVW note+4(FP), R2
|
|
|
|
// change stack
|
|
MOVW m_gsignal(R0), R3
|
|
MOVW (g_stack+stack_hi)(R3), R13
|
|
|
|
// make room for args, retval and g
|
|
SUB $24, R13
|
|
|
|
// save g
|
|
MOVW g, R3
|
|
MOVW R3, 20(R13)
|
|
|
|
// g = m->gsignal
|
|
MOVW m_gsignal(R0), g
|
|
|
|
// load args and call sighandler
|
|
ADD $4,R13,R5
|
|
MOVM.IA [R1-R3], (R5)
|
|
BL runtime·sighandler(SB)
|
|
MOVW 16(R13), R0 // retval
|
|
|
|
// restore g
|
|
MOVW 20(R13), g
|
|
|
|
// call noted(R0)
|
|
MOVW R0, 4(R13)
|
|
BL runtime·noted(SB)
|
|
RET
|
|
|
|
//func sigpanictramp()
|
|
TEXT runtime·sigpanictramp(SB),NOSPLIT,$0-0
|
|
MOVW.W R0, -4(R13)
|
|
B runtime·sigpanic(SB)
|
|
|
|
//func setfpmasks()
|
|
// Only used by the 64-bit runtime.
|
|
TEXT runtime·setfpmasks(SB),NOSPLIT,$0
|
|
RET
|
|
|
|
#define ERRMAX 128 /* from os_plan9.h */
|
|
|
|
// func errstr() string
|
|
// Only used by package syscall.
|
|
// Grab error string due to a syscall made
|
|
// in entersyscall mode, without going
|
|
// through the allocator (issue 4994).
|
|
// See ../syscall/asm_plan9_arm.s:/·Syscall/
|
|
TEXT runtime·errstr(SB),NOSPLIT,$0-8
|
|
MOVW g_m(g), R0
|
|
MOVW (m_mOS+mOS_errstr)(R0), R1
|
|
MOVW R1, ret_base+0(FP)
|
|
MOVW $ERRMAX, R2
|
|
MOVW R2, ret_len+4(FP)
|
|
MOVW $SYS_ERRSTR, R0
|
|
SWI $0
|
|
MOVW R1, R2
|
|
MOVBU 0(R2), R0
|
|
CMP $0, R0
|
|
BEQ 3(PC)
|
|
ADD $1, R2
|
|
B -4(PC)
|
|
SUB R1, R2
|
|
MOVW R2, ret_len+4(FP)
|
|
RET
|
|
|
|
TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
|
|
B runtime·armPublicationBarrier(SB)
|
|
|
|
// never called (cgo not supported)
|
|
TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0
|
|
MOVW $0, R0
|
|
MOVW R0, (R0)
|
|
RET
|