runtime: add support files for linux/mips{,le} port

Only exe buildmode without cgo supported.

Change-Id: Id104a79a99d3285c04db00fd98b8affa94ea3c37
Reviewed-on: https://go-review.googlesource.com/31487
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

src/runtime/atomic_mipsx.s

+// Copyright 2016 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.
+
+// +build mips mipsle
+
+#include "textflag.h"
+
+TEXT ·publicationBarrier(SB),NOSPLIT,$0
+	SYNC
+	RET

src/runtime/cputicks.go

@@ -6,6 +6,8 @@
 // +build !arm64
 // +build !mips64
 // +build !mips64le
+// +build !mips
+// +build !mipsle
 
 package runtime
 

src/runtime/defs_linux_mipsx.go

+// Copyright 2016 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.
+
+// +build mips mipsle
+// +build linux
+
+package runtime
+
+const (
+	_EINTR  = 0x4
+	_EAGAIN = 0xb
+	_ENOMEM = 0xc
+
+	_PROT_NONE  = 0x0
+	_PROT_READ  = 0x1
+	_PROT_WRITE = 0x2
+	_PROT_EXEC  = 0x4
+
+	_MAP_ANON    = 0x800
+	_MAP_PRIVATE = 0x2
+	_MAP_FIXED   = 0x10
+
+	_MADV_DONTNEED   = 0x4
+	_MADV_HUGEPAGE   = 0xe
+	_MADV_NOHUGEPAGE = 0xf
+
+	_SA_RESTART = 0x10000000
+	_SA_ONSTACK = 0x8000000
+	_SA_SIGINFO = 0x8
+
+	_SIGHUP    = 0x1
+	_SIGINT    = 0x2
+	_SIGQUIT   = 0x3
+	_SIGILL    = 0x4
+	_SIGTRAP   = 0x5
+	_SIGABRT   = 0x6
+	_SIGEMT    = 0x7
+	_SIGFPE    = 0x8
+	_SIGKILL   = 0x9
+	_SIGBUS    = 0xa
+	_SIGSEGV   = 0xb
+	_SIGSYS    = 0xc
+	_SIGPIPE   = 0xd
+	_SIGALRM   = 0xe
+	_SIGUSR1   = 0x10
+	_SIGUSR2   = 0x11
+	_SIGCHLD   = 0x12
+	_SIGPWR    = 0x13
+	_SIGWINCH  = 0x14
+	_SIGURG    = 0x15
+	_SIGIO     = 0x16
+	_SIGSTOP   = 0x17
+	_SIGTSTP   = 0x18
+	_SIGCONT   = 0x19
+	_SIGTTIN   = 0x1a
+	_SIGTTOU   = 0x1b
+	_SIGVTALRM = 0x1c
+	_SIGPROF   = 0x1d
+	_SIGXCPU   = 0x1e
+	_SIGXFSZ   = 0x1f
+
+	_FPE_INTDIV = 0x1
+	_FPE_INTOVF = 0x2
+	_FPE_FLTDIV = 0x3
+	_FPE_FLTOVF = 0x4
+	_FPE_FLTUND = 0x5
+	_FPE_FLTRES = 0x6
+	_FPE_FLTINV = 0x7
+	_FPE_FLTSUB = 0x8
+
+	_BUS_ADRALN = 0x1
+	_BUS_ADRERR = 0x2
+	_BUS_OBJERR = 0x3
+
+	_SEGV_MAPERR = 0x1
+	_SEGV_ACCERR = 0x2
+
+	_ITIMER_REAL    = 0x0
+	_ITIMER_VIRTUAL = 0x1
+	_ITIMER_PROF    = 0x2
+
+	_EPOLLIN       = 0x1
+	_EPOLLOUT      = 0x4
+	_EPOLLERR      = 0x8
+	_EPOLLHUP      = 0x10
+	_EPOLLRDHUP    = 0x2000
+	_EPOLLET       = 0x80000000
+	_EPOLL_CLOEXEC = 0x80000
+	_EPOLL_CTL_ADD = 0x1
+	_EPOLL_CTL_DEL = 0x2
+	_EPOLL_CTL_MOD = 0x3
+)
+
+type timespec struct {
+	tv_sec  int32
+	tv_nsec int32
+}
+
+//go:nosplit
+func (ts *timespec) set_sec(x int64) {
+	ts.tv_sec = int32(x)
+}
+
+//go:nosplit
+func (ts *timespec) set_nsec(x int32) {
+	ts.tv_nsec = x
+}
+
+type timeval struct {
+	tv_sec  int32
+	tv_usec int32
+}
+
+//go:nosplit
+func (tv *timeval) set_usec(x int32) {
+	tv.tv_usec = x
+}
+
+type sigactiont struct {
+	sa_flags   uint32
+	sa_handler uintptr
+	sa_mask    [4]uint32
+	// linux header does not have sa_restorer field,
+	// but it is used in setsig(). it is no harm to put it here
+	sa_restorer uintptr
+}
+
+type siginfo struct {
+	si_signo int32
+	si_code  int32
+	si_errno int32
+	// below here is a union; si_addr is the only field we use
+	si_addr uint32
+}
+
+type itimerval struct {
+	it_interval timeval
+	it_value    timeval
+}
+
+type epollevent struct {
+	events    uint32
+	pad_cgo_0 [4]byte
+	data      uint64
+}
+
+const (
+	_O_RDONLY    = 0x0
+	_O_CLOEXEC   = 0x80000
+	_SA_RESTORER = 0
+)
+
+type stackt struct {
+	ss_sp    *byte
+	ss_size  uintptr
+	ss_flags int32
+}
+
+type sigcontext struct {
+	sc_regmask   uint32
+	sc_status    uint32
+	sc_pc        uint64
+	sc_regs      [32]uint64
+	sc_fpregs    [32]uint64
+	sc_acx       uint32
+	sc_fpc_csr   uint32
+	sc_fpc_eir   uint32
+	sc_used_math uint32
+	sc_dsp       uint32
+	sc_mdhi      uint64
+	sc_mdlo      uint64
+	sc_hi1       uint32
+	sc_lo1       uint32
+	sc_hi2       uint32
+	sc_lo2       uint32
+	sc_hi3       uint32
+	sc_lo3       uint32
+}
+
+type ucontext struct {
+	uc_flags    uint32
+	uc_link     *ucontext
+	uc_stack    stackt
+	Pad_cgo_0   [4]byte
+	uc_mcontext sigcontext
+	uc_sigmask  [4]uint32
+}

src/runtime/gcinfo_test.go

@@ -139,7 +139,7 @@ type BigStruct struct {
 
 func infoBigStruct() []byte {
 	switch runtime.GOARCH {
-	case "386", "arm":
+	case "386", "arm", "mips", "mipsle":
 		return []byte{
 			typePointer,                                                // q *int
 			typeScalar, typeScalar, typeScalar, typeScalar, typeScalar, // w byte; e [17]byte

src/runtime/hash32.go

@@ -6,7 +6,7 @@
 //   xxhash: https://code.google.com/p/xxhash/
 // cityhash: https://code.google.com/p/cityhash/
 
-// +build 386 arm
+// +build 386 arm mips mipsle
 
 package runtime
 

src/runtime/lfstack_32bit.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build 386 arm nacl
+// +build 386 arm nacl mips mipsle
 
 package runtime
 

src/runtime/malloc.go

@@ -141,10 +141,11 @@ const (
 	// See https://golang.org/issue/5402 and https://golang.org/issue/5236.
 	// On other 64-bit platforms, we limit the arena to 512GB, or 39 bits.
 	// On 32-bit, we don't bother limiting anything, so we use the full 32-bit address.
+	// The only exception is mips32 which only has access to low 2GB of virtual memory.
 	// On Darwin/arm64, we cannot reserve more than ~5GB of virtual memory,
 	// but as most devices have less than 4GB of physical memory anyway, we
 	// try to be conservative here, and only ask for a 2GB heap.
-	_MHeapMap_TotalBits = (_64bit*sys.GoosWindows)*35 + (_64bit*(1-sys.GoosWindows)*(1-sys.GoosDarwin*sys.GoarchArm64))*39 + sys.GoosDarwin*sys.GoarchArm64*31 + (1-_64bit)*32
+	_MHeapMap_TotalBits = (_64bit*sys.GoosWindows)*35 + (_64bit*(1-sys.GoosWindows)*(1-sys.GoosDarwin*sys.GoarchArm64))*39 + sys.GoosDarwin*sys.GoarchArm64*31 + (1-_64bit)*(32-(sys.GoarchMips+sys.GoarchMipsle))
 	_MHeapMap_Bits      = _MHeapMap_TotalBits - _PageShift
 
 	_MaxMem = uintptr(1<<_MHeapMap_TotalBits - 1)

src/runtime/memclr_mipsx.s

+// Copyright 2016 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.
+
+// +build mips mipsle
+
+#include "textflag.h"
+
+#ifdef GOARCH_mips
+#define MOVWHI  MOVWL
+#define MOVWLO  MOVWR
+#else
+#define MOVWHI  MOVWR
+#define MOVWLO  MOVWL
+#endif
+
+// void runtime·memclrNoHeapPointers(void*, uintptr)
+TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-8
+	MOVW	n+4(FP), R2
+	MOVW	ptr+0(FP), R1
+
+	SGTU	$4, R2, R3
+	ADDU	R2, R1, R4
+	BNE	R3, small_zero
+
+ptr_align:
+	AND	$3, R1, R3
+	BEQ	R3, setup
+	SUBU	R1, R0, R3
+	AND	$3, R3		// R3 contains number of bytes needed to align ptr
+	MOVWHI	R0, 0(R1)	// MOVWHI will write zeros up to next word boundary
+	SUBU	R3, R2
+	ADDU	R3, R1
+
+setup:
+	AND	$31, R2, R6
+	AND	$3, R2, R5
+	SUBU	R6, R4, R6	// end pointer for 32-byte chunks
+	SUBU	R5, R4, R5	// end pointer for 4-byte chunks
+
+large:
+	BEQ	R1, R6, words
+	MOVW	R0, 0(R1)
+	MOVW	R0, 4(R1)
+	MOVW	R0, 8(R1)
+	MOVW	R0, 12(R1)
+	MOVW	R0, 16(R1)
+	MOVW	R0, 20(R1)
+	MOVW	R0, 24(R1)
+	MOVW	R0, 28(R1)
+	ADDU	$32, R1
+	JMP	large
+
+words:
+	BEQ	R1, R5, tail
+	MOVW	R0, 0(R1)
+	ADDU	$4, R1
+	JMP	words
+
+tail:
+	BEQ	R1, R4, ret
+	MOVWLO	R0, -1(R4)
+
+ret:
+	RET
+
+small_zero:
+	BEQ	R1, R4, ret
+	MOVB	R0, 0(R1)
+	ADDU	$1, R1
+	JMP	small_zero

src/runtime/memmove_mipsx.s

+// Copyright 2016 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.
+
+// +build mips mipsle
+
+#include "textflag.h"
+
+#ifdef GOARCH_mips
+#define MOVWHI  MOVWL
+#define MOVWLO  MOVWR
+#else
+#define MOVWHI  MOVWR
+#define MOVWLO  MOVWL
+#endif
+
+// void runtime·memmove(void*, void*, uintptr)
+TEXT runtime·memmove(SB),NOSPLIT,$-0-12
+	MOVW	n+8(FP), R3
+	MOVW	from+4(FP), R2
+	MOVW	to+0(FP), R1
+
+	ADDU	R3, R2, R4	// end pointer for source
+	ADDU	R3, R1, R5	// end pointer for destination
+
+	// if destination is ahead of source, start at the end of the buffer and go backward.
+	SGTU	R1, R2, R6
+	BNE	R6, backward
+
+	// if less than 4 bytes, use byte by byte copying
+	SGTU	$4, R3, R6
+	BNE	R6, f_small_copy
+
+	// align destination to 4 bytes
+	AND	$3, R1, R6
+	BEQ	R6, f_dest_aligned
+	SUBU	R1, R0, R6
+	AND	$3, R6
+	MOVWHI	0(R2), R7
+	SUBU	R6, R3
+	MOVWLO	3(R2), R7
+	ADDU	R6, R2
+	MOVWHI	R7, 0(R1)
+	ADDU	R6, R1
+
+f_dest_aligned:
+	AND	$31, R3, R7
+	AND	$3, R3, R6
+	SUBU	R7, R5, R7	// end pointer for 32-byte chunks
+	SUBU	R6, R5, R6	// end pointer for 4-byte chunks
+
+	// if source is not aligned, use unaligned reads
+	AND	$3, R2, R8
+	BNE	R8, f_large_ua
+
+f_large:
+	BEQ	R1, R7, f_words
+	ADDU	$32, R1
+	MOVW	0(R2), R8
+	MOVW	4(R2), R9
+	MOVW	8(R2), R10
+	MOVW	12(R2), R11
+	MOVW	16(R2), R12
+	MOVW	20(R2), R13
+	MOVW	24(R2), R14
+	MOVW	28(R2), R15
+	ADDU	$32, R2
+	MOVW	R8, -32(R1)
+	MOVW	R9, -28(R1)
+	MOVW	R10, -24(R1)
+	MOVW	R11, -20(R1)
+	MOVW	R12, -16(R1)
+	MOVW	R13, -12(R1)
+	MOVW	R14, -8(R1)
+	MOVW	R15, -4(R1)
+	JMP	f_large
+
+f_words:
+	BEQ	R1, R6, f_tail
+	ADDU	$4, R1
+	MOVW	0(R2), R8
+	ADDU	$4, R2
+	MOVW	R8, -4(R1)
+	JMP	f_words
+
+f_tail:
+	BEQ	R1, R5, ret
+	MOVWLO	-1(R4), R8
+	MOVWLO	R8, -1(R5)
+
+ret:
+	RET
+
+f_large_ua:
+	BEQ	R1, R7, f_words_ua
+	ADDU	$32, R1
+	MOVWHI	0(R2), R8
+	MOVWHI	4(R2), R9
+	MOVWHI	8(R2), R10
+	MOVWHI	12(R2), R11
+	MOVWHI	16(R2), R12
+	MOVWHI	20(R2), R13
+	MOVWHI	24(R2), R14
+	MOVWHI	28(R2), R15
+	MOVWLO	3(R2), R8
+	MOVWLO	7(R2), R9
+	MOVWLO	11(R2), R10
+	MOVWLO	15(R2), R11
+	MOVWLO	19(R2), R12
+	MOVWLO	23(R2), R13
+	MOVWLO	27(R2), R14
+	MOVWLO	31(R2), R15
+	ADDU	$32, R2
+	MOVW	R8, -32(R1)
+	MOVW	R9, -28(R1)
+	MOVW	R10, -24(R1)
+	MOVW	R11, -20(R1)
+	MOVW	R12, -16(R1)
+	MOVW	R13, -12(R1)
+	MOVW	R14, -8(R1)
+	MOVW	R15, -4(R1)
+	JMP	f_large_ua
+
+f_words_ua:
+	BEQ	R1, R6, f_tail_ua
+	MOVWHI	0(R2), R8
+	ADDU	$4, R1
+	MOVWLO	3(R2), R8
+	ADDU	$4, R2
+	MOVW	R8, -4(R1)
+	JMP	f_words_ua
+
+f_tail_ua:
+	BEQ	R1, R5, ret
+	MOVWHI	-4(R4), R8
+	MOVWLO	-1(R4), R8
+	MOVWLO	R8, -1(R5)
+	JMP	ret
+
+f_small_copy:
+	BEQ	R1, R5, ret
+	ADDU	$1, R1
+	MOVB	0(R2), R6
+	ADDU	$1, R2
+	MOVB	R6, -1(R1)
+	JMP	f_small_copy
+
+backward:
+	SGTU	$4, R3, R6
+	BNE	R6, b_small_copy
+
+	AND	$3, R5, R6
+	BEQ	R6, b_dest_aligned
+	MOVWHI	-4(R4), R7
+	SUBU	R6, R3
+	MOVWLO	-1(R4), R7
+	SUBU	R6, R4
+	MOVWLO	R7, -1(R5)
+	SUBU	R6, R5
+
+b_dest_aligned:
+	AND	$31, R3, R7
+	AND	$3, R3, R6
+	ADDU	R7, R1, R7
+	ADDU	R6, R1, R6
+
+	AND	$3, R4, R8
+	BNE	R8, b_large_ua
+
+b_large:
+	BEQ	R5, R7, b_words
+	ADDU	$-32, R5
+	MOVW	-4(R4), R8
+	MOVW	-8(R4), R9
+	MOVW	-12(R4), R10
+	MOVW	-16(R4), R11
+	MOVW	-20(R4), R12
+	MOVW	-24(R4), R13
+	MOVW	-28(R4), R14
+	MOVW	-32(R4), R15
+	ADDU	$-32, R4
+	MOVW	R8, 28(R5)
+	MOVW	R9, 24(R5)
+	MOVW	R10, 20(R5)
+	MOVW	R11, 16(R5)
+	MOVW	R12, 12(R5)
+	MOVW	R13, 8(R5)
+	MOVW	R14, 4(R5)
+	MOVW	R15, 0(R5)
+	JMP	b_large
+
+b_words:
+	BEQ	R5, R6, b_tail
+	ADDU	$-4, R5
+	MOVW	-4(R4), R8
+	ADDU	$-4, R4
+	MOVW	R8, 0(R5)
+	JMP	b_words
+
+b_tail:
+	BEQ	R5, R1, ret
+	MOVWHI	0(R2), R8	// R2 and R1 have the same alignment so we don't need to load a whole word
+	MOVWHI	R8, 0(R1)
+	JMP	ret
+
+b_large_ua:
+	BEQ	R5, R7, b_words_ua
+	ADDU	$-32, R5
+	MOVWHI	-4(R4), R8
+	MOVWHI	-8(R4), R9
+	MOVWHI	-12(R4), R10
+	MOVWHI	-16(R4), R11
+	MOVWHI	-20(R4), R12
+	MOVWHI	-24(R4), R13
+	MOVWHI	-28(R4), R14
+	MOVWHI	-32(R4), R15
+	MOVWLO	-1(R4), R8
+	MOVWLO	-5(R4), R9
+	MOVWLO	-9(R4), R10
+	MOVWLO	-13(R4), R11
+	MOVWLO	-17(R4), R12
+	MOVWLO	-21(R4), R13
+	MOVWLO	-25(R4), R14
+	MOVWLO	-29(R4), R15
+	ADDU	$-32, R4
+	MOVW	R8, 28(R5)
+	MOVW	R9, 24(R5)
+	MOVW	R10, 20(R5)
+	MOVW	R11, 16(R5)
+	MOVW	R12, 12(R5)
+	MOVW	R13, 8(R5)
+	MOVW	R14, 4(R5)
+	MOVW	R15, 0(R5)
+	JMP	b_large_ua
+
+b_words_ua:
+	BEQ	R5, R6, b_tail_ua
+	MOVWHI	-4(R4), R8
+	ADDU	$-4, R5
+	MOVWLO	-1(R4), R8
+	ADDU	$-4, R4
+	MOVW	R8, 0(R5)
+	JMP	b_words_ua
+
+b_tail_ua:
+	BEQ	R5, R1, ret
+	MOVWHI	(R2), R8
+	MOVWLO	3(R2), R8
+	MOVWHI	R8, 0(R1)
+	JMP ret
+
+b_small_copy:
+	BEQ	R5, R1, ret
+	ADDU	$-1, R5
+	MOVB	-1(R4), R6
+	ADDU	$-1, R4
+	MOVB	R6, 0(R5)
+	JMP	b_small_copy

src/runtime/os_linux_generic.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !mips
+// +build !mipsle
 // +build !mips64
 // +build !mips64le
 // +build !s390x

src/runtime/os_linux_mips64x.go

@@ -30,7 +30,7 @@ func cputicks() int64 {
 
 const (
 	_SS_DISABLE  = 2
-	_NSIG        = 65
+	_NSIG        = 129
 	_SI_USER     = 0
 	_SIG_BLOCK   = 1
 	_SIG_UNBLOCK = 2

src/runtime/os_linux_mipsx.go

+// Copyright 2016 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.
+
+// +build linux
+// +build mips mipsle
+
+package runtime
+
+var randomNumber uint32
+
+func archauxv(tag, val uintptr) {
+	switch tag {
+	case _AT_RANDOM:
+		// sysargs filled in startupRandomData, but that
+		// pointer may not be word aligned, so we must treat
+		// it as a byte array.
+		randomNumber = uint32(startupRandomData[4]) | uint32(startupRandomData[5])<<8 |
+			uint32(startupRandomData[6])<<16 | uint32(startupRandomData[7])<<24
+	}
+}
+
+//go:nosplit
+func cputicks() int64 {
+	// Currently cputicks() is used in blocking profiler and to seed fastrand().
+	// nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
+	// randomNumber provides better seeding of fastrand1.
+	return nanotime() + int64(randomNumber)
+}
+
+const (
+	_SS_DISABLE  = 2
+	_NSIG        = 128 + 1
+	_SI_USER     = 0
+	_SIG_BLOCK   = 1
+	_SIG_UNBLOCK = 2
+	_SIG_SETMASK = 3
+	_RLIMIT_AS   = 6
+)
+
+type sigset [4]uint32
+
+type rlimit struct {
+	rlim_cur uintptr
+	rlim_max uintptr
+}
+
+var sigset_all = sigset{^uint32(0), ^uint32(0), ^uint32(0), ^uint32(0)}
+
+//go:nosplit
+//go:nowritebarrierrec
+func sigaddset(mask *sigset, i int) {
+	(*mask)[(i-1)/32] |= 1 << ((uint32(i) - 1) & 31)
+}
+
+func sigdelset(mask *sigset, i int) {
+	(*mask)[(i-1)/32] &^= 1 << ((uint32(i) - 1) & 31)
+}
+
+func sigfillset(mask *[4]uint32) {
+	(*mask)[0], (*mask)[1], (*mask)[2], (*mask)[3] = ^uint32(0), ^uint32(0), ^uint32(0), ^uint32(0)
+}

src/runtime/os_linux_noauxv.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !amd64,!arm,!arm64,!mips64,!mips64le,!s390x,!ppc64,!ppc64le
+// +build !amd64,!arm,!arm64,!mips,!mipsle,!mips64,!mips64le,!s390x,!ppc64,!ppc64le
 
 package runtime
 

src/runtime/rt0_linux_mipsx.s

+// Copyright 2016 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.
+
+// +build linux
+// +build mips mipsle
+
+#include "textflag.h"
+
+TEXT _rt0_mips_linux(SB),NOSPLIT,$0
+	JMP	_main<>(SB)
+
+TEXT _rt0_mipsle_linux(SB),NOSPLIT,$0
+	JMP	_main<>(SB)
+
+TEXT _main<>(SB),NOSPLIT,$-4
+	// In a statically linked binary, the stack contains argc,
+	// argv as argc string pointers followed by a NULL, envv as a
+	// sequence of string pointers followed by a NULL, and auxv.
+	// There is no TLS base pointer.
+	MOVW	0(R29), R1	// argc
+	ADD	$4, R29, R2	// argv
+	JMP	main(SB)
+
+TEXT main(SB),NOSPLIT,$-4
+	MOVW	$runtime·rt0_go(SB), R4
+	JMP	(R4)

src/runtime/signal_linux_mipsx.go

+// Copyright 2016 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.
+
+// +build linux
+// +build mips mipsle
+
+package runtime
+
+import "unsafe"
+
+type sigctxt struct {
+	info *siginfo
+	ctxt unsafe.Pointer
+}
+
+func (c *sigctxt) regs() *sigcontext { return &(*ucontext)(c.ctxt).uc_mcontext }
+func (c *sigctxt) r0() uint32        { return uint32(c.regs().sc_regs[0]) }
+func (c *sigctxt) r1() uint32        { return uint32(c.regs().sc_regs[1]) }
+func (c *sigctxt) r2() uint32        { return uint32(c.regs().sc_regs[2]) }
+func (c *sigctxt) r3() uint32        { return uint32(c.regs().sc_regs[3]) }
+func (c *sigctxt) r4() uint32        { return uint32(c.regs().sc_regs[4]) }
+func (c *sigctxt) r5() uint32        { return uint32(c.regs().sc_regs[5]) }
+func (c *sigctxt) r6() uint32        { return uint32(c.regs().sc_regs[6]) }
+func (c *sigctxt) r7() uint32        { return uint32(c.regs().sc_regs[7]) }
+func (c *sigctxt) r8() uint32        { return uint32(c.regs().sc_regs[8]) }
+func (c *sigctxt) r9() uint32        { return uint32(c.regs().sc_regs[9]) }
+func (c *sigctxt) r10() uint32       { return uint32(c.regs().sc_regs[10]) }
+func (c *sigctxt) r11() uint32       { return uint32(c.regs().sc_regs[11]) }
+func (c *sigctxt) r12() uint32       { return uint32(c.regs().sc_regs[12]) }
+func (c *sigctxt) r13() uint32       { return uint32(c.regs().sc_regs[13]) }
+func (c *sigctxt) r14() uint32       { return uint32(c.regs().sc_regs[14]) }
+func (c *sigctxt) r15() uint32       { return uint32(c.regs().sc_regs[15]) }
+func (c *sigctxt) r16() uint32       { return uint32(c.regs().sc_regs[16]) }
+func (c *sigctxt) r17() uint32       { return uint32(c.regs().sc_regs[17]) }
+func (c *sigctxt) r18() uint32       { return uint32(c.regs().sc_regs[18]) }
+func (c *sigctxt) r19() uint32       { return uint32(c.regs().sc_regs[19]) }
+func (c *sigctxt) r20() uint32       { return uint32(c.regs().sc_regs[20]) }
+func (c *sigctxt) r21() uint32       { return uint32(c.regs().sc_regs[21]) }
+func (c *sigctxt) r22() uint32       { return uint32(c.regs().sc_regs[22]) }
+func (c *sigctxt) r23() uint32       { return uint32(c.regs().sc_regs[23]) }
+func (c *sigctxt) r24() uint32       { return uint32(c.regs().sc_regs[24]) }
+func (c *sigctxt) r25() uint32       { return uint32(c.regs().sc_regs[25]) }
+func (c *sigctxt) r26() uint32       { return uint32(c.regs().sc_regs[26]) }
+func (c *sigctxt) r27() uint32       { return uint32(c.regs().sc_regs[27]) }
+func (c *sigctxt) r28() uint32       { return uint32(c.regs().sc_regs[28]) }
+func (c *sigctxt) r29() uint32       { return uint32(c.regs().sc_regs[29]) }
+func (c *sigctxt) r30() uint32       { return uint32(c.regs().sc_regs[30]) }
+func (c *sigctxt) r31() uint32       { return uint32(c.regs().sc_regs[31]) }
+func (c *sigctxt) sp() uint32        { return uint32(c.regs().sc_regs[29]) }
+func (c *sigctxt) pc() uint32        { return uint32(c.regs().sc_pc) }
+func (c *sigctxt) link() uint32      { return uint32(c.regs().sc_regs[31]) }
+func (c *sigctxt) lo() uint32        { return uint32(c.regs().sc_mdlo) }
+func (c *sigctxt) hi() uint32        { return uint32(c.regs().sc_mdhi) }
+
+func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) }
+func (c *sigctxt) sigaddr() uint32 { return c.info.si_addr }
+
+func (c *sigctxt) set_r30(x uint32)  { c.regs().sc_regs[30] = uint64(x) }
+func (c *sigctxt) set_pc(x uint32)   { c.regs().sc_pc = uint64(x) }
+func (c *sigctxt) set_sp(x uint32)   { c.regs().sc_regs[29] = uint64(x) }
+func (c *sigctxt) set_link(x uint32) { c.regs().sc_regs[31] = uint64(x) }
+
+func (c *sigctxt) set_sigcode(x uint32) { c.info.si_code = int32(x) }
+func (c *sigctxt) set_sigaddr(x uint32) { c.info.si_addr = x }

src/runtime/signal_mipsx.go

+// Copyright 2016 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.
+
+// +build linux
+// +build mips mipsle
+
+package runtime
+
+import (
+	"runtime/internal/sys"
+	"unsafe"
+)
+
+func dumpregs(c *sigctxt) {
+	print("r0   ", hex(c.r0()), "\t")
+	print("r1   ", hex(c.r1()), "\n")
+	print("r2   ", hex(c.r2()), "\t")
+	print("r3   ", hex(c.r3()), "\n")
+	print("r4   ", hex(c.r4()), "\t")
+	print("r5   ", hex(c.r5()), "\n")
+	print("r6   ", hex(c.r6()), "\t")
+	print("r7   ", hex(c.r7()), "\n")
+	print("r8   ", hex(c.r8()), "\t")
+	print("r9   ", hex(c.r9()), "\n")
+	print("r10  ", hex(c.r10()), "\t")
+	print("r11  ", hex(c.r11()), "\n")
+	print("r12  ", hex(c.r12()), "\t")
+	print("r13  ", hex(c.r13()), "\n")
+	print("r14  ", hex(c.r14()), "\t")
+	print("r15  ", hex(c.r15()), "\n")
+	print("r16  ", hex(c.r16()), "\t")
+	print("r17  ", hex(c.r17()), "\n")
+	print("r18  ", hex(c.r18()), "\t")
+	print("r19  ", hex(c.r19()), "\n")
+	print("r20  ", hex(c.r20()), "\t")
+	print("r21  ", hex(c.r21()), "\n")
+	print("r22  ", hex(c.r22()), "\t")
+	print("r23  ", hex(c.r23()), "\n")
+	print("r24  ", hex(c.r24()), "\t")
+	print("r25  ", hex(c.r25()), "\n")
+	print("r26  ", hex(c.r26()), "\t")
+	print("r27  ", hex(c.r27()), "\n")
+	print("r28  ", hex(c.r28()), "\t")
+	print("r29  ", hex(c.r29()), "\n")
+	print("r30  ", hex(c.r30()), "\t")
+	print("r31  ", hex(c.r31()), "\n")
+	print("pc   ", hex(c.pc()), "\t")
+	print("link ", hex(c.link()), "\n")
+	print("lo   ", hex(c.lo()), "\t")
+	print("hi   ", hex(c.hi()), "\n")
+}
+
+func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) }
+func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) }
+func (c *sigctxt) siglr() uintptr { return uintptr(c.link()) }
+func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }
+
+// preparePanic sets up the stack to look like a call to sigpanic.
+func (c *sigctxt) preparePanic(sig uint32, gp *g) {
+	// We arrange link, and pc to pretend the panicking
+	// function calls sigpanic directly.
+	// Always save LINK to stack so that panics in leaf
+	// functions are correctly handled. This smashes
+	// the stack frame but we're not going back there
+	// anyway.
+	sp := c.sp() - sys.MinFrameSize
+	c.set_sp(sp)
+	*(*uint32)(unsafe.Pointer(uintptr(sp))) = c.link()
+
+	pc := gp.sigpc
+
+	// If we don't recognize the PC as code
+	// but we do recognize the link register as code,
+	// then assume this was a call to non-code and treat like
+	// pc == 0, to make unwinding show the context.
+	if pc != 0 && findfunc(pc) == nil && findfunc(uintptr(c.link())) != nil {
+		pc = 0
+	}
+
+	// Don't bother saving PC if it's zero, which is
+	// probably a call to a nil func: the old link register
+	// is more useful in the stack trace.
+	if pc != 0 {
+		c.set_link(uint32(pc))
+	}
+
+	// In case we are panicking from external C code
+	c.set_r30(uint32(uintptr(unsafe.Pointer(gp))))
+	c.set_pc(uint32(funcPC(sigpanic)))
+}

src/runtime/sigtab_linux_generic.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !mips
+// +build !mipsle
 // +build !mips64
 // +build !mips64le
 // +build linux

src/runtime/sigtab_linux_mips64x.go

-// 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.
-
-// +build mips64 mips64le
-// +build linux
-
-package runtime
-
-type sigTabT struct {
-	flags int32
-	name  string
-}
-
-var sigtable = [...]sigTabT{
-	/* 0 */ {0, "SIGNONE: no trap"},
-	/* 1 */ {_SigNotify + _SigKill, "SIGHUP: terminal line hangup"},
-	/* 2 */ {_SigNotify + _SigKill, "SIGINT: interrupt"},
-	/* 3 */ {_SigNotify + _SigThrow, "SIGQUIT: quit"},
-	/* 4 */ {_SigThrow + _SigUnblock, "SIGILL: illegal instruction"},
-	/* 5 */ {_SigThrow + _SigUnblock, "SIGTRAP: trace trap"},
-	/* 6 */ {_SigNotify + _SigThrow, "SIGABRT: abort"},
-	/* 7 */ {_SigThrow, "SIGEMT"},
-	/* 8 */ {_SigPanic + _SigUnblock, "SIGFPE: floating-point exception"},
-	/* 9 */ {0, "SIGKILL: kill"},
-	/* 10 */ {_SigPanic + _SigUnblock, "SIGBUS: bus error"},
-	/* 11 */ {_SigPanic + _SigUnblock, "SIGSEGV: segmentation violation"},
-	/* 12 */ {_SigThrow, "SIGSYS: bad system call"},
-	/* 13 */ {_SigNotify, "SIGPIPE: write to broken pipe"},
-	/* 14 */ {_SigNotify, "SIGALRM: alarm clock"},
-	/* 15 */ {_SigNotify + _SigKill, "SIGTERM: termination"},
-	/* 16 */ {_SigNotify, "SIGUSR1: user-defined signal 1"},
-	/* 17 */ {_SigNotify, "SIGUSR2: user-defined signal 2"},
-	/* 18 */ {_SigNotify + _SigUnblock, "SIGCHLD: child status has changed"},
-	/* 19 */ {_SigNotify, "SIGPWR: power failure restart"},
-	/* 20 */ {_SigNotify, "SIGWINCH: window size change"},
-	/* 21 */ {_SigNotify, "SIGURG: urgent condition on socket"},
-	/* 22 */ {_SigNotify, "SIGIO: i/o now possible"},
-	/* 23 */ {0, "SIGSTOP: stop, unblockable"},
-	/* 24 */ {_SigNotify + _SigDefault, "SIGTSTP: keyboard stop"},
-	/* 25 */ {_SigNotify + _SigDefault, "SIGCONT: continue"},
-	/* 26 */ {_SigNotify + _SigDefault, "SIGTTIN: background read from tty"},
-	/* 27 */ {_SigNotify + _SigDefault, "SIGTTOU: background write to tty"},
-	/* 28 */ {_SigNotify, "SIGVTALRM: virtual alarm clock"},
-	/* 29 */ {_SigNotify + _SigUnblock, "SIGPROF: profiling alarm clock"},
-	/* 30 */ {_SigNotify, "SIGXCPU: cpu limit exceeded"},
-	/* 31 */ {_SigNotify, "SIGXFSZ: file size limit exceeded"},
-	/* 32 */ {_SigSetStack + _SigUnblock, "signal 32"}, /* SIGCANCEL; see issue 6997 */
-	/* 33 */ {_SigSetStack + _SigUnblock, "signal 33"}, /* SIGSETXID; see issues 3871, 9400, 12498 */
-	/* 34 */ {_SigNotify, "signal 34"},
-	/* 35 */ {_SigNotify, "signal 35"},
-	/* 36 */ {_SigNotify, "signal 36"},
-	/* 37 */ {_SigNotify, "signal 37"},
-	/* 38 */ {_SigNotify, "signal 38"},
-	/* 39 */ {_SigNotify, "signal 39"},
-	/* 40 */ {_SigNotify, "signal 40"},
-	/* 41 */ {_SigNotify, "signal 41"},
-	/* 42 */ {_SigNotify, "signal 42"},
-	/* 43 */ {_SigNotify, "signal 43"},
-	/* 44 */ {_SigNotify, "signal 44"},
-	/* 45 */ {_SigNotify, "signal 45"},
-	/* 46 */ {_SigNotify, "signal 46"},
-	/* 47 */ {_SigNotify, "signal 47"},
-	/* 48 */ {_SigNotify, "signal 48"},
-	/* 49 */ {_SigNotify, "signal 49"},
-	/* 50 */ {_SigNotify, "signal 50"},
-	/* 51 */ {_SigNotify, "signal 51"},
-	/* 52 */ {_SigNotify, "signal 52"},
-	/* 53 */ {_SigNotify, "signal 53"},
-	/* 54 */ {_SigNotify, "signal 54"},
-	/* 55 */ {_SigNotify, "signal 55"},
-	/* 56 */ {_SigNotify, "signal 56"},
-	/* 57 */ {_SigNotify, "signal 57"},
-	/* 58 */ {_SigNotify, "signal 58"},
-	/* 59 */ {_SigNotify, "signal 59"},
-	/* 60 */ {_SigNotify, "signal 60"},
-	/* 61 */ {_SigNotify, "signal 61"},
-	/* 62 */ {_SigNotify, "signal 62"},
-	/* 63 */ {_SigNotify, "signal 63"},
-	/* 64 */ {_SigNotify, "signal 64"},
-}

src/runtime/sigtab_linux_mipsx.go

+// 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.
+
+// +build mips mipsle mips64 mips64le
+// +build linux
+
+package runtime
+
+type sigTabT struct {
+	flags int32
+	name  string
+}
+
+var sigtable = [...]sigTabT{
+	/*  0 */ {0, "SIGNONE: no trap"},
+	/*  1 */ {_SigNotify + _SigKill, "SIGHUP: terminal line hangup"},
+	/*  2 */ {_SigNotify + _SigKill, "SIGINT: interrupt"},
+	/*  3 */ {_SigNotify + _SigThrow, "SIGQUIT: quit"},
+	/*  4 */ {_SigThrow + _SigUnblock, "SIGILL: illegal instruction"},
+	/*  5 */ {_SigThrow + _SigUnblock, "SIGTRAP: trace trap"},
+	/*  6 */ {_SigNotify + _SigThrow, "SIGABRT: abort"},
+	/*  7 */ {_SigThrow, "SIGEMT"},
+	/*  8 */ {_SigPanic + _SigUnblock, "SIGFPE: floating-point exception"},
+	/*  9 */ {0, "SIGKILL: kill"},
+	/*  10 */ {_SigPanic + _SigUnblock, "SIGBUS: bus error"},
+	/*  11 */ {_SigPanic + _SigUnblock, "SIGSEGV: segmentation violation"},
+	/*  12 */ {_SigThrow, "SIGSYS: bad system call"},
+	/*  13 */ {_SigNotify, "SIGPIPE: write to broken pipe"},
+	/*  14 */ {_SigNotify, "SIGALRM: alarm clock"},
+	/*  15 */ {_SigNotify + _SigKill, "SIGTERM: termination"},
+	/*  16 */ {_SigNotify, "SIGUSR1: user-defined signal 1"},
+	/*  17 */ {_SigNotify, "SIGUSR2: user-defined signal 2"},
+	/*  18 */ {_SigNotify + _SigUnblock, "SIGCHLD: child status has changed"},
+	/*  19 */ {_SigNotify, "SIGPWR: power failure restart"},
+	/*  20 */ {_SigNotify, "SIGWINCH: window size change"},
+	/*  21 */ {_SigNotify, "SIGURG: urgent condition on socket"},
+	/*  22 */ {_SigNotify, "SIGIO: i/o now possible"},
+	/*  23 */ {0, "SIGSTOP: stop, unblockable"},
+	/*  24 */ {_SigNotify + _SigDefault, "SIGTSTP: keyboard stop"},
+	/*  25 */ {_SigNotify + _SigDefault, "SIGCONT: continue"},
+	/*  26 */ {_SigNotify + _SigDefault, "SIGTTIN: background read from tty"},
+	/*  27 */ {_SigNotify + _SigDefault, "SIGTTOU: background write to tty"},
+	/*  28 */ {_SigNotify, "SIGVTALRM: virtual alarm clock"},
+	/*  29 */ {_SigNotify + _SigUnblock, "SIGPROF: profiling alarm clock"},
+	/*  30 */ {_SigNotify, "SIGXCPU: cpu limit exceeded"},
+	/*  31 */ {_SigNotify, "SIGXFSZ: file size limit exceeded"},
+	/*  32 */ {_SigSetStack + _SigUnblock, "signal 32"}, /* SIGCANCEL; see issue 6997 */
+	/*  33 */ {_SigSetStack + _SigUnblock, "signal 33"}, /* SIGSETXID; see issues 3871, 9400, 12498 */
+	/*  34 */ {_SigNotify, "signal 34"},
+	/*  35 */ {_SigNotify, "signal 35"},
+	/*  36 */ {_SigNotify, "signal 36"},
+	/*  37 */ {_SigNotify, "signal 37"},
+	/*  38 */ {_SigNotify, "signal 38"},
+	/*  39 */ {_SigNotify, "signal 39"},
+	/*  40 */ {_SigNotify, "signal 40"},
+	/*  41 */ {_SigNotify, "signal 41"},
+	/*  42 */ {_SigNotify, "signal 42"},
+	/*  43 */ {_SigNotify, "signal 43"},
+	/*  44 */ {_SigNotify, "signal 44"},
+	/*  45 */ {_SigNotify, "signal 45"},
+	/*  46 */ {_SigNotify, "signal 46"},
+	/*  47 */ {_SigNotify, "signal 47"},
+	/*  48 */ {_SigNotify, "signal 48"},
+	/*  49 */ {_SigNotify, "signal 49"},
+	/*  50 */ {_SigNotify, "signal 50"},
+	/*  51 */ {_SigNotify, "signal 51"},
+	/*  52 */ {_SigNotify, "signal 52"},
+	/*  53 */ {_SigNotify, "signal 53"},
+	/*  54 */ {_SigNotify, "signal 54"},
+	/*  55 */ {_SigNotify, "signal 55"},
+	/*  56 */ {_SigNotify, "signal 56"},
+	/*  57 */ {_SigNotify, "signal 57"},
+	/*  58 */ {_SigNotify, "signal 58"},
+	/*  59 */ {_SigNotify, "signal 59"},
+	/*  60 */ {_SigNotify, "signal 60"},
+	/*  61 */ {_SigNotify, "signal 61"},
+	/*  62 */ {_SigNotify, "signal 62"},
+	/*  63 */ {_SigNotify, "signal 63"},
+	/*  64 */ {_SigNotify, "signal 64"},
+	/*  65 */ {_SigNotify, "signal 65"},
+	/*  66 */ {_SigNotify, "signal 66"},
+	/*  67 */ {_SigNotify, "signal 67"},
+	/*  68 */ {_SigNotify, "signal 68"},
+	/*  69 */ {_SigNotify, "signal 69"},
+	/*  70 */ {_SigNotify, "signal 70"},
+	/*  71 */ {_SigNotify, "signal 71"},
+	/*  72 */ {_SigNotify, "signal 72"},
+	/*  73 */ {_SigNotify, "signal 73"},
+	/*  74 */ {_SigNotify, "signal 74"},
+	/*  75 */ {_SigNotify, "signal 75"},
+	/*  76 */ {_SigNotify, "signal 76"},
+	/*  77 */ {_SigNotify, "signal 77"},
+	/*  78 */ {_SigNotify, "signal 78"},
+	/*  79 */ {_SigNotify, "signal 79"},
+	/*  80 */ {_SigNotify, "signal 80"},
+	/*  81 */ {_SigNotify, "signal 81"},
+	/*  82 */ {_SigNotify, "signal 82"},
+	/*  83 */ {_SigNotify, "signal 83"},
+	/*  84 */ {_SigNotify, "signal 84"},
+	/*  85 */ {_SigNotify, "signal 85"},
+	/*  86 */ {_SigNotify, "signal 86"},
+	/*  87 */ {_SigNotify, "signal 87"},
+	/*  88 */ {_SigNotify, "signal 88"},
+	/*  89 */ {_SigNotify, "signal 89"},
+	/*  90 */ {_SigNotify, "signal 90"},
+	/*  91 */ {_SigNotify, "signal 91"},
+	/*  92 */ {_SigNotify, "signal 92"},
+	/*  93 */ {_SigNotify, "signal 93"},
+	/*  94 */ {_SigNotify, "signal 94"},
+	/*  95 */ {_SigNotify, "signal 95"},
+	/*  96 */ {_SigNotify, "signal 96"},
+	/*  97 */ {_SigNotify, "signal 97"},
+	/*  98 */ {_SigNotify, "signal 98"},
+	/*  99 */ {_SigNotify, "signal 99"},
+	/* 100 */ {_SigNotify, "signal 100"},
+	/* 101 */ {_SigNotify, "signal 101"},
+	/* 102 */ {_SigNotify, "signal 102"},
+	/* 103 */ {_SigNotify, "signal 103"},
+	/* 104 */ {_SigNotify, "signal 104"},
+	/* 105 */ {_SigNotify, "signal 105"},
+	/* 106 */ {_SigNotify, "signal 106"},
+	/* 107 */ {_SigNotify, "signal 107"},
+	/* 108 */ {_SigNotify, "signal 108"},
+	/* 109 */ {_SigNotify, "signal 109"},
+	/* 110 */ {_SigNotify, "signal 110"},
+	/* 111 */ {_SigNotify, "signal 111"},
+	/* 112 */ {_SigNotify, "signal 112"},
+	/* 113 */ {_SigNotify, "signal 113"},
+	/* 114 */ {_SigNotify, "signal 114"},
+	/* 115 */ {_SigNotify, "signal 115"},
+	/* 116 */ {_SigNotify, "signal 116"},
+	/* 117 */ {_SigNotify, "signal 117"},
+	/* 118 */ {_SigNotify, "signal 118"},
+	/* 119 */ {_SigNotify, "signal 119"},
+	/* 120 */ {_SigNotify, "signal 120"},
+	/* 121 */ {_SigNotify, "signal 121"},
+	/* 122 */ {_SigNotify, "signal 122"},
+	/* 123 */ {_SigNotify, "signal 123"},
+	/* 124 */ {_SigNotify, "signal 124"},
+	/* 125 */ {_SigNotify, "signal 125"},
+	/* 126 */ {_SigNotify, "signal 126"},
+	/* 127 */ {_SigNotify, "signal 127"},
+	/* 128 */ {_SigNotify, "signal 128"},
+}

src/runtime/stubs32.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build 386 arm amd64p32
+// +build 386 arm amd64p32 mips mipsle
 
 package runtime
 

src/runtime/sys_linux_mipsx.s

+// Copyright 2016 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.
+
+// +build linux
+// +build mips mipsle
+
+//
+// System calls and other sys.stuff for mips, Linux
+//
+
+#include "go_asm.h"
+#include "go_tls.h"
+#include "textflag.h"
+
+#define SYS_exit		        4001
+#define SYS_read		        4003
+#define SYS_write		        4004
+#define SYS_open		        4005
+#define SYS_close		        4006
+#define SYS_getpid		        4020
+#define SYS_kill		        4037
+#define SYS_fcntl		        4055
+#define SYS_gettimeofday	    4078
+#define SYS_mmap		        4090
+#define SYS_munmap		        4091
+#define SYS_setitimer		    4104
+#define SYS_clone		        4120
+#define SYS_newselect		    4142
+#define SYS_sched_yield		    4162
+#define SYS_rt_sigreturn	    4193
+#define SYS_rt_sigaction	    4194
+#define SYS_rt_sigprocmask		4195
+#define SYS_sigaltstack		    4206
+#define SYS_getrlimit		    4076
+#define SYS_madvise		        4218
+#define SYS_mincore		        4217
+#define SYS_gettid		        4222
+#define SYS_tkill		        4236
+#define SYS_futex		        4238
+#define SYS_sched_getaffinity	4240
+#define SYS_exit_group		    4246
+#define SYS_epoll_create	    4248
+#define SYS_epoll_ctl		    4249
+#define SYS_epoll_wait		    4250
+#define SYS_clock_gettime	    4263
+#define SYS_epoll_create1	    4326
+
+TEXT runtime·exit(SB),NOSPLIT,$0-4
+	MOVW	code+0(FP), R4
+	MOVW	$SYS_exit_group, R2
+	SYSCALL
+	UNDEF
+	RET
+
+TEXT runtime·exit1(SB),NOSPLIT,$0-4
+	MOVW	code+0(FP), R4
+	MOVW	$SYS_exit, R2
+	SYSCALL
+	UNDEF
+	RET
+
+TEXT runtime·open(SB),NOSPLIT,$0-16
+	MOVW	name+0(FP), R4
+	MOVW	mode+4(FP), R5
+	MOVW	perm+8(FP), R6
+	MOVW	$SYS_open, R2
+	SYSCALL
+	BEQ	R7, 2(PC)
+	MOVW	$-1, R2
+	MOVW	R2, ret+12(FP)
+	RET
+
+TEXT runtime·closefd(SB),NOSPLIT,$0-8
+	MOVW	fd+0(FP), R4
+	MOVW	$SYS_close, R2
+	SYSCALL
+	BEQ	R7, 2(PC)
+	MOVW	$-1, R2
+	MOVW	R2, ret+4(FP)
+	RET
+
+TEXT runtime·write(SB),NOSPLIT,$0-16
+	MOVW	fd+0(FP), R4
+	MOVW	p+4(FP), R5
+	MOVW	n+8(FP), R6
+	MOVW	$SYS_write, R2
+	SYSCALL
+	BEQ	R7, 2(PC)
+	MOVW	$-1, R2
+	MOVW	R2, ret+12(FP)
+	RET
+
+TEXT runtime·read(SB),NOSPLIT,$0-16
+	MOVW	fd+0(FP), R4
+	MOVW	p+4(FP), R5
+	MOVW	n+8(FP), R6
+	MOVW	$SYS_read, R2
+	SYSCALL
+	BEQ	R7, 2(PC)
+	MOVW	$-1, R2
+	MOVW	R2, ret+12(FP)
+	RET
+
+TEXT runtime·getrlimit(SB),NOSPLIT,$0-12
+	MOVW	kind+0(FP), R4
+	MOVW	limit+4(FP), R5
+	MOVW	$SYS_getrlimit, R2
+	SYSCALL
+	MOVW	R2, ret+8(FP)
+	RET
+
+TEXT runtime·usleep(SB),NOSPLIT,$28-4
+	MOVW	usec+0(FP), R3
+	MOVW	R3, R5
+	MOVW	$1000000, R4
+	DIVU	R4, R3
+	MOVW	LO, R3
+	MOVW	R3, 24(R29)
+	MULU	R3, R4
+	MOVW	LO, R4
+	SUBU	R4, R5
+	MOVW	R5, 28(R29)
+
+	// select(0, 0, 0, 0, &tv)
+	MOVW	$0, R4
+	MOVW	$0, R5
+	MOVW	$0, R6
+	MOVW	$0, R7
+	ADDU	$24, R29, R8
+	MOVW	R8, 16(R29)
+	MOVW	$SYS_newselect, R2
+	SYSCALL
+	RET
+
+TEXT runtime·gettid(SB),NOSPLIT,$0-4
+	MOVW	$SYS_gettid, R2
+	SYSCALL
+	MOVW	R2, ret+0(FP)
+	RET
+
+TEXT runtime·raise(SB),NOSPLIT,$0-4
+	MOVW	$SYS_gettid, R2
+	SYSCALL
+	MOVW	R2, R4	// arg 1 tid
+	MOVW	sig+0(FP), R5	// arg 2
+	MOVW	$SYS_tkill, R2
+	SYSCALL
+	RET
+
+TEXT runtime·raiseproc(SB),NOSPLIT,$0
+	MOVW	$SYS_getpid, R2
+	SYSCALL
+	MOVW	R2, R4	// arg 1 pid
+	MOVW	sig+0(FP), R5	// arg 2
+	MOVW	$SYS_kill, R2
+	SYSCALL
+	RET
+
+TEXT runtime·setitimer(SB),NOSPLIT,$0-12
+	MOVW	mode+0(FP), R4
+	MOVW	new+4(FP), R5
+	MOVW	old+8(FP), R6
+	MOVW	$SYS_setitimer, R2
+	SYSCALL
+	RET
+
+TEXT runtime·mincore(SB),NOSPLIT,$0-16
+	MOVW	addr+0(FP), R4
+	MOVW	n+4(FP), R5
+	MOVW	dst+8(FP), R6
+	MOVW	$SYS_mincore, R2
+	SYSCALL
+	SUBU	R2, R0, R2	// caller expects negative errno
+	MOVW	R2, ret+12(FP)
+	RET
+
+// func now() (sec int64, nsec int32)
+TEXT time·now(SB),NOSPLIT,$8-12
+	MOVW	$0, R4	// CLOCK_REALTIME
+	MOVW	$4(R29), R5
+	MOVW	$SYS_clock_gettime, R2
+	SYSCALL
+	MOVW	4(R29), R3	// sec
+	MOVW	8(R29), R5	// nsec
+#ifdef GOARCH_mips
+	MOVW	R3, sec_lo+4(FP)
+	MOVW	R0, sec_hi+0(FP)
+#else
+	MOVW	R3, sec_lo+0(FP)
+	MOVW	R0, sec_hi+4(FP)
+#endif
+	MOVW	R5, nsec+8(FP)
+	RET
+
+TEXT runtime·nanotime(SB),NOSPLIT,$8-8
+	MOVW	$1, R4	// CLOCK_MONOTONIC
+	MOVW	$4(R29), R5
+	MOVW	$SYS_clock_gettime, R2
+	SYSCALL
+	MOVW	4(R29), R3	// sec
+	MOVW	8(R29), R5	// nsec
+	// sec is in R3, nsec in R5
+	// return nsec in R3
+	MOVW	$1000000000, R4
+	MULU	R4, R3
+	MOVW	LO, R3
+	ADDU	R5, R3
+	SGTU	R5, R3, R4
+#ifdef GOARCH_mips
+	MOVW	R3, ret_lo+4(FP)
+#else
+	MOVW	R3, ret_lo+0(FP)
+#endif
+	MOVW	HI, R3
+	ADDU	R4, R3
+#ifdef GOARCH_mips
+	MOVW	R3, ret_hi+0(FP)
+#else
+	MOVW	R3, ret_hi+4(FP)
+#endif
+	RET
+
+TEXT runtime·rtsigprocmask(SB),NOSPLIT,$0-16
+	MOVW	how+0(FP), R4
+	MOVW	new+4(FP), R5
+	MOVW	old+8(FP), R6
+	MOVW	size+12(FP), R7
+	MOVW	$SYS_rt_sigprocmask, R2
+	SYSCALL
+	BEQ	R7, 2(PC)
+	UNDEF	// crash
+	RET
+
+TEXT runtime·rt_sigaction(SB),NOSPLIT,$0-20
+	MOVW	sig+0(FP), R4
+	MOVW	new+4(FP), R5
+	MOVW	old+8(FP), R6
+	MOVW	size+12(FP), R7
+	MOVW	$SYS_rt_sigaction, R2
+	SYSCALL
+	MOVW	R2, ret+16(FP)
+	RET
+
+TEXT runtime·sigfwd(SB),NOSPLIT,$0-16
+	MOVW	sig+4(FP), R4
+	MOVW	info+8(FP), R5
+	MOVW	ctx+12(FP), R6
+	MOVW	fn+0(FP), R25
+	MOVW	R29, R22
+	SUBU	$16, R29
+	AND	$0x7, R29	// shadow space for 4 args aligned to 8 bytes as per O32 ABI
+	JAL	(R25)
+	MOVW	R22, R29
+	RET
+
+TEXT runtime·sigtramp(SB),NOSPLIT,$12
+	// this might be called in external code context,
+	// where g is not set.
+	MOVB	runtime·iscgo(SB), R1
+	BEQ	R1, 2(PC)
+	JAL	runtime·load_g(SB)
+
+	MOVW	R4, 4(R29)
+	MOVW	R5, 8(R29)
+	MOVW	R6, 12(R29)
+	MOVW	$runtime·sigtrampgo(SB), R1
+	JAL	(R1)
+	RET
+
+TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
+	JMP	runtime·sigtramp(SB)
+
+TEXT runtime·mmap(SB),NOSPLIT,$20-28
+	MOVW	addr+0(FP), R4
+	MOVW	n+4(FP), R5
+	MOVW	prot+8(FP), R6
+	MOVW	flags+12(FP), R7
+	MOVW	fd+16(FP), R8
+	MOVW	off+20(FP), R9
+	MOVW	R8, 16(R29)
+	MOVW	R9, 20(R29)
+
+	MOVW	$SYS_mmap, R2
+	SYSCALL
+	MOVW	R2, ret+24(FP)
+	RET
+
+TEXT runtime·munmap(SB),NOSPLIT,$0-8
+	MOVW	addr+0(FP), R4
+	MOVW	n+4(FP), R5
+	MOVW	$SYS_munmap, R2
+	SYSCALL
+	BEQ	R7, 2(PC)
+	UNDEF	// crash
+	RET
+
+TEXT runtime·madvise(SB),NOSPLIT,$0-12
+	MOVW	addr+0(FP), R4
+	MOVW	n+4(FP), R5
+	MOVW	flags+8(FP), R6
+	MOVW	$SYS_madvise, R2
+	SYSCALL
+	// ignore failure - maybe pages are locked
+	RET
+
+// int32 futex(int32 *uaddr, int32 op, int32 val, struct timespec *timeout, int32 *uaddr2, int32 val2);
+TEXT runtime·futex(SB),NOSPLIT,$20-28
+	MOVW	addr+0(FP), R4
+	MOVW	op+4(FP), R5
+	MOVW	val+8(FP), R6
+	MOVW	ts+12(FP), R7
+
+	MOVW	addr2+16(FP), R8
+	MOVW	val3+20(FP), R9
+
+	MOVW	R8, 16(R29)
+	MOVW	R9, 20(R29)
+
+	MOVW	$SYS_futex, R2
+	SYSCALL
+	MOVW	R2, ret+24(FP)
+	RET
+
+
+// int32 clone(int32 flags, void *stk, M *mm, G *gg, void (*fn)(void));
+TEXT runtime·clone(SB),NOSPLIT,$-4-24
+	MOVW	flags+0(FP), R4
+	MOVW	stk+4(FP), R5
+	MOVW	R0, R6	// ptid
+	MOVW	R0, R7	// tls
+
+	// O32 syscall handler unconditionally copies arguments 5-8 from stack,
+	// even for syscalls with less than 8 arguments. Reserve 32 bytes of new
+	// stack so that any syscall invoked immediately in the new thread won't fail.
+	ADD	$-32, R5
+
+	// Copy mm, gg, fn off parent stack for use by child.
+	MOVW	mm+8(FP), R16
+	MOVW	gg+12(FP), R17
+	MOVW	fn+16(FP), R18
+
+	MOVW	$1234, R1
+
+	MOVW	R16, 0(R5)
+	MOVW	R17, 4(R5)
+	MOVW	R18, 8(R5)
+
+	MOVW	R1, 12(R5)
+
+	MOVW	$SYS_clone, R2
+	SYSCALL
+
+	// In parent, return.
+	BEQ	R2, 5(PC)
+	SUBU	R2, R0, R3
+	CMOVN	R7, R3, R2
+	MOVW	R2, ret+20(FP)
+	RET
+
+	// In child, on new stack.
+	// Check that SP is as we expect
+	MOVW	12(R29), R16
+	MOVW	$1234, R1
+	BEQ	R16, R1, 2(PC)
+	MOVW	(R0), R0
+
+	// Initialize m->procid to Linux tid
+	MOVW	$SYS_gettid, R2
+	SYSCALL
+
+	MOVW	0(R29), R16	// m
+	MOVW	4(R29), R17	// g
+	MOVW	8(R29), R18	// fn
+
+	BEQ	R16, nog
+	BEQ	R17, nog
+
+	MOVW	R2, m_procid(R16)
+
+	// In child, set up new stack
+	MOVW	R16, g_m(R17)
+	MOVW	R17, g
+
+// TODO(mips32): doesn't have runtime·stackcheck(SB)
+
+nog:
+	// Call fn
+	ADDU	$32, R29
+	JAL	(R18)
+
+	// It shouldn't return.	 If it does, exit that thread.
+	ADDU	$-32, R29
+	MOVW	$0xf4, R4
+	MOVW	$SYS_exit, R2
+	SYSCALL
+	UNDEF
+
+TEXT runtime·sigaltstack(SB),NOSPLIT,$0
+	MOVW	new+0(FP), R4
+	MOVW	old+4(FP), R5
+	MOVW	$SYS_sigaltstack, R2
+	SYSCALL
+	BEQ	R7, 2(PC)
+	UNDEF	// crash
+	RET
+
+TEXT runtime·osyield(SB),NOSPLIT,$0
+	MOVW	$SYS_sched_yield, R2
+	SYSCALL
+	RET
+
+TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0-16
+	MOVW	pid+0(FP), R4
+	MOVW	len+4(FP), R5
+	MOVW	buf+8(FP), R6
+	MOVW	$SYS_sched_getaffinity, R2
+	SYSCALL
+	MOVW	R2, ret+12(FP)
+	RET
+
+// int32 runtime·epollcreate(int32 size);
+TEXT runtime·epollcreate(SB),NOSPLIT,$0-8
+	MOVW	size+0(FP), R4
+	MOVW	$SYS_epoll_create, R2
+	SYSCALL
+	MOVW	R2, ret+4(FP)
+	RET
+
+// int32 runtime·epollcreate1(int32 flags);
+TEXT runtime·epollcreate1(SB),NOSPLIT,$0-8
+	MOVW	flags+0(FP), R4
+	MOVW	$SYS_epoll_create1, R2
+	SYSCALL
+	MOVW	R2, ret+4(FP)
+	RET
+
+// func epollctl(epfd, op, fd int32, ev *epollEvent) int
+TEXT runtime·epollctl(SB),NOSPLIT,$0-20
+	MOVW	epfd+0(FP), R4
+	MOVW	op+4(FP), R5
+	MOVW	fd+8(FP), R6
+	MOVW	ev+12(FP), R7
+	MOVW	$SYS_epoll_ctl, R2
+	SYSCALL
+	MOVW	R2, ret+16(FP)
+	RET
+
+// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
+TEXT runtime·epollwait(SB),NOSPLIT,$0-20
+	MOVW	epfd+0(FP), R4
+	MOVW	ev+4(FP), R5
+	MOVW	nev+8(FP), R6
+	MOVW	timeout+12(FP), R7
+	MOVW	$SYS_epoll_wait, R2
+	SYSCALL
+	MOVW	R2, ret+16(FP)
+	RET
+
+// void runtime·closeonexec(int32 fd);
+TEXT runtime·closeonexec(SB),NOSPLIT,$0-4
+	MOVW	fd+0(FP), R4	// fd
+	MOVW	$2, R5	// F_SETFD
+	MOVW	$1, R6	// FD_CLOEXEC
+	MOVW	$SYS_fcntl, R2
+	SYSCALL
+	RET

src/runtime/sys_mipsx.go

+// Copyright 2016 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.
+
+// +build mips mipsle
+
+package runtime
+
+import "unsafe"
+
+// adjust Gobuf as if it executed a call to fn with context ctxt
+// and then did an immediate Gosave.
+func gostartcall(buf *gobuf, fn, ctxt unsafe.Pointer) {
+	if buf.lr != 0 {
+		throw("invalid use of gostartcall")
+	}
+	buf.lr = buf.pc
+	buf.pc = uintptr(fn)
+	buf.ctxt = ctxt
+}

src/runtime/tls_mipsx.s

+// Copyright 2016 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.
+
+// +build mips mipsle
+
+#include "go_asm.h"
+#include "go_tls.h"
+#include "funcdata.h"
+#include "textflag.h"
+
+// If !iscgo, this is a no-op.
+TEXT runtime·save_g(SB),NOSPLIT,$-4-0
+	MOVB	runtime·iscgo(SB), R23
+	BEQ	R23, nocgo
+	UNDEF
+nocgo:
+	RET
+
+TEXT runtime·load_g(SB),NOSPLIT,$-4-0
+	RET

src/runtime/unaligned2.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build arm mips64 mips64le
+// +build arm mips mipsle mips64 mips64le
 
 package runtime
 

src/runtime/vlrt.go

@@ -23,7 +23,7 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
-// +build arm 386
+// +build arm 386 mips mipsle
 
 package runtime
 
@@ -198,6 +198,11 @@ func dodiv(n, d uint64) (q, r uint64) {
 		return slowdodiv(n, d)
 	}
 
+	if GOARCH == "mips" || GOARCH == "mipsle" {
+		// No _div64by32 on mips and using only _mul64by32 doesn't bring much benefit
+		return slowdodiv(n, d)
+	}
+
 	if d > n {
 		return 0, n
 	}