runtime: added go files for linux/mips64{,le} support

Change-Id: I14b537922b97d4bce9e0523d98a822da906348f1
Reviewed-on: https://go-review.googlesource.com/14447
Reviewed-by: Minux Ma <minux@golang.org>

5 files changed, 480 insertions, 0 deletions

diff --git a/src/runtime/defs_linux_mips64x.go b/src/runtime/defs_linux_mips64x.go
new file mode 100644
index 0000000000..bb3cd9801e
--- /dev/null
+++ b/src/runtime/defs_linux_mips64x.go
@@ -0,0 +1,183 @@
+// +build mips64 mips64le
+// +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
+)
+
+//struct Sigset {
+//	uint64	sig[1];
+//};
+//typedef uint64 Sigset;
+
+type timespec struct {
+	tv_sec  int64
+	tv_nsec int64
+}
+
+func (ts *timespec) set_sec(x int64) {
+	ts.tv_sec = x
+}
+
+func (ts *timespec) set_nsec(x int32) {
+	ts.tv_nsec = int64(x)
+}
+
+type timeval struct {
+	tv_sec  int64
+	tv_usec int64
+}
+
+func (tv *timeval) set_usec(x int32) {
+	tv.tv_usec = int64(x)
+}
+
+type sigactiont struct {
+	sa_flags   uint32
+	sa_handler uintptr
+	sa_mask    [2]uint64
+	// 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
+	__pad0   [1]int32
+	// below here is a union; si_addr is the only field we use
+	si_addr uint64
+}
+
+type itimerval struct {
+	it_interval timeval
+	it_value    timeval
+}
+
+type epollevent struct {
+	events    uint32
+	pad_cgo_0 [4]byte
+	data      [8]byte // unaligned uintptr
+}
+
+const (
+	_O_RDONLY    = 0x0
+	_O_CLOEXEC   = 0x80000
+	_SA_RESTORER = 0
+)
+
+type sigaltstackt struct {
+	ss_sp    *byte
+	ss_size  uintptr
+	ss_flags int32
+}
+
+type sigcontext struct {
+	sc_regs      [32]uint64
+	sc_fpregs    [32]uint64
+	sc_mdhi      uint64
+	sc_hi1       uint64
+	sc_hi2       uint64
+	sc_hi3       uint64
+	sc_mdlo      uint64
+	sc_lo1       uint64
+	sc_lo2       uint64
+	sc_lo3       uint64
+	sc_pc        uint64
+	sc_fpc_csr   uint32
+	sc_used_math uint32
+	sc_dsp       uint32
+	sc_reserved  uint32
+}
+
+type ucontext struct {
+	uc_flags    uint64
+	uc_link     *ucontext
+	uc_stack    sigaltstackt
+	uc_mcontext sigcontext
+	uc_sigmask  uint64
+}
diff --git a/src/runtime/lfstack_linux_mips64x.go b/src/runtime/lfstack_linux_mips64x.go
new file mode 100644
index 0000000000..49b65585f4
--- /dev/null
+++ b/src/runtime/lfstack_linux_mips64x.go
@@ -0,0 +1,32 @@
+// 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
+
+import "unsafe"
+
+// On mips64, Linux limits the user address space to 40 bits (see
+// TASK_SIZE64 in the Linux kernel).  This has grown over time,
+// so here we allow 48 bit addresses.
+//
+// In addition to the 16 bits taken from the top, we can take 3 from the
+// bottom, because node must be pointer-aligned, giving a total of 19 bits
+// of count.
+const (
+	addrBits = 48
+	cntBits  = 64 - addrBits + 3
+)
+
+func lfstackPack(node *lfnode, cnt uintptr) uint64 {
+	return uint64(uintptr(unsafe.Pointer(node)))<<(64-addrBits) | uint64(cnt&(1<<cntBits-1))
+}
+
+func lfstackUnpack(val uint64) (node *lfnode, cnt uintptr) {
+	node = (*lfnode)(unsafe.Pointer(uintptr(val >> cntBits << 3)))
+	cnt = uintptr(val & (1<<cntBits - 1))
+	return
+}
diff --git a/src/runtime/os_linux_mips64x.go b/src/runtime/os_linux_mips64x.go
new file mode 100644
index 0000000000..4d2e9e8a20
--- /dev/null
+++ b/src/runtime/os_linux_mips64x.go
@@ -0,0 +1,18 @@
+// 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
+
+var randomNumber uint32
+
+//go:nosplit
+func cputicks() int64 {
+	// Currently cputicks() is used in blocking profiler and to seed fastrand1().
+	// nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
+	// randomNumber provides better seeding of fastrand1.
+	return nanotime() + int64(randomNumber)
+}
diff --git a/src/runtime/signal_linux_mips64x.go b/src/runtime/signal_linux_mips64x.go
new file mode 100644
index 0000000000..c550f69908
--- /dev/null
+++ b/src/runtime/signal_linux_mips64x.go
@@ -0,0 +1,67 @@
+// 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 linux
+// +build mips64 mips64le
+
+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() uint64        { return c.regs().sc_regs[0] }
+func (c *sigctxt) r1() uint64        { return c.regs().sc_regs[1] }
+func (c *sigctxt) r2() uint64        { return c.regs().sc_regs[2] }
+func (c *sigctxt) r3() uint64        { return c.regs().sc_regs[3] }
+func (c *sigctxt) r4() uint64        { return c.regs().sc_regs[4] }
+func (c *sigctxt) r5() uint64        { return c.regs().sc_regs[5] }
+func (c *sigctxt) r6() uint64        { return c.regs().sc_regs[6] }
+func (c *sigctxt) r7() uint64        { return c.regs().sc_regs[7] }
+func (c *sigctxt) r8() uint64        { return c.regs().sc_regs[8] }
+func (c *sigctxt) r9() uint64        { return c.regs().sc_regs[9] }
+func (c *sigctxt) r10() uint64       { return c.regs().sc_regs[10] }
+func (c *sigctxt) r11() uint64       { return c.regs().sc_regs[11] }
+func (c *sigctxt) r12() uint64       { return c.regs().sc_regs[12] }
+func (c *sigctxt) r13() uint64       { return c.regs().sc_regs[13] }
+func (c *sigctxt) r14() uint64       { return c.regs().sc_regs[14] }
+func (c *sigctxt) r15() uint64       { return c.regs().sc_regs[15] }
+func (c *sigctxt) r16() uint64       { return c.regs().sc_regs[16] }
+func (c *sigctxt) r17() uint64       { return c.regs().sc_regs[17] }
+func (c *sigctxt) r18() uint64       { return c.regs().sc_regs[18] }
+func (c *sigctxt) r19() uint64       { return c.regs().sc_regs[19] }
+func (c *sigctxt) r20() uint64       { return c.regs().sc_regs[20] }
+func (c *sigctxt) r21() uint64       { return c.regs().sc_regs[21] }
+func (c *sigctxt) r22() uint64       { return c.regs().sc_regs[22] }
+func (c *sigctxt) r23() uint64       { return c.regs().sc_regs[23] }
+func (c *sigctxt) r24() uint64       { return c.regs().sc_regs[24] }
+func (c *sigctxt) r25() uint64       { return c.regs().sc_regs[25] }
+func (c *sigctxt) r26() uint64       { return c.regs().sc_regs[26] }
+func (c *sigctxt) r27() uint64       { return c.regs().sc_regs[27] }
+func (c *sigctxt) r28() uint64       { return c.regs().sc_regs[28] }
+func (c *sigctxt) r29() uint64       { return c.regs().sc_regs[29] }
+func (c *sigctxt) r30() uint64       { return c.regs().sc_regs[30] }
+func (c *sigctxt) r31() uint64       { return c.regs().sc_regs[31] }
+func (c *sigctxt) sp() uint64        { return c.regs().sc_regs[29] }
+func (c *sigctxt) pc() uint64        { return c.regs().sc_pc }
+func (c *sigctxt) link() uint64      { return c.regs().sc_regs[31] }
+func (c *sigctxt) lo() uint64        { return c.regs().sc_mdlo }
+func (c *sigctxt) hi() uint64        { return c.regs().sc_mdhi }
+
+func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) }
+func (c *sigctxt) sigaddr() uint64 { return c.info.si_addr }
+
+func (c *sigctxt) set_r30(x uint64)  { c.regs().sc_regs[30] = x }
+func (c *sigctxt) set_pc(x uint64)   { c.regs().sc_pc = x }
+func (c *sigctxt) set_sp(x uint64)   { c.regs().sc_regs[29] = x }
+func (c *sigctxt) set_link(x uint64) { c.regs().sc_regs[31] = x }
+
+func (c *sigctxt) set_sigcode(x uint32) { c.info.si_code = int32(x) }
+func (c *sigctxt) set_sigaddr(x uint64) {
+	*(*uintptr)(add(unsafe.Pointer(c.info), 2*ptrSize)) = uintptr(x)
+}
diff --git a/src/runtime/signal_mips64x.go b/src/runtime/signal_mips64x.go
new file mode 100644
index 0000000000..81ce59594a
--- /dev/null
+++ b/src/runtime/signal_mips64x.go
@@ -0,0 +1,180 @@
+// 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 linux
+// +build mips64 mips64le
+
+package runtime
+
+import "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")
+}
+
+var crashing int32
+
+// May run during STW, so write barriers are not allowed.
+//go:nowritebarrier
+func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
+	_g_ := getg()
+	c := &sigctxt{info, ctxt}
+
+	if sig == _SIGPROF {
+		sigprof(uintptr(c.pc()), uintptr(c.sp()), uintptr(c.link()), gp, _g_.m)
+		return
+	}
+	flags := int32(_SigThrow)
+	if sig < uint32(len(sigtable)) {
+		flags = sigtable[sig].flags
+	}
+	if c.sigcode() != _SI_USER && flags&_SigPanic != 0 {
+		// Make it look like a call to the signal func.
+		// Have to pass arguments out of band since
+		// augmenting the stack frame would break
+		// the unwinding code.
+		gp.sig = sig
+		gp.sigcode0 = uintptr(c.sigcode())
+		gp.sigcode1 = uintptr(c.sigaddr())
+		gp.sigpc = uintptr(c.pc())
+
+		// 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() - ptrSize
+		c.set_sp(sp)
+		*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link()
+
+		pc := uintptr(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(uint64(pc))
+		}
+
+		// In case we are panicking from external C code
+		c.set_r30(uint64(uintptr(unsafe.Pointer(gp))))
+		c.set_pc(uint64(funcPC(sigpanic)))
+		return
+	}
+
+	if c.sigcode() == _SI_USER || flags&_SigNotify != 0 {
+		if sigsend(sig) {
+			return
+		}
+	}
+
+	if flags&_SigKill != 0 {
+		exit(2)
+	}
+
+	if flags&_SigThrow == 0 {
+		return
+	}
+
+	_g_.m.throwing = 1
+	_g_.m.caughtsig.set(gp)
+
+	if crashing == 0 {
+		startpanic()
+	}
+
+	if sig < uint32(len(sigtable)) {
+		print(sigtable[sig].name, "\n")
+	} else {
+		print("Signal ", sig, "\n")
+	}
+
+	print("PC=", hex(c.pc()), " m=", _g_.m.id, "\n")
+	if _g_.m.lockedg != nil && _g_.m.ncgo > 0 && gp == _g_.m.g0 {
+		print("signal arrived during cgo execution\n")
+		gp = _g_.m.lockedg
+	}
+	print("\n")
+
+	level, _, docrash := gotraceback()
+	if level > 0 {
+		goroutineheader(gp)
+		tracebacktrap(uintptr(c.pc()), uintptr(c.sp()), uintptr(c.link()), gp)
+		if crashing > 0 && gp != _g_.m.curg && _g_.m.curg != nil && readgstatus(_g_.m.curg)&^_Gscan == _Grunning {
+			// tracebackothers on original m skipped this one; trace it now.
+			goroutineheader(_g_.m.curg)
+			traceback(^uintptr(0), ^uintptr(0), 0, gp)
+		} else if crashing == 0 {
+			tracebackothers(gp)
+			print("\n")
+		}
+		dumpregs(c)
+	}
+
+	if docrash {
+		crashing++
+		if crashing < sched.mcount {
+			// There are other m's that need to dump their stacks.
+			// Relay SIGQUIT to the next m by sending it to the current process.
+			// All m's that have already received SIGQUIT have signal masks blocking
+			// receipt of any signals, so the SIGQUIT will go to an m that hasn't seen it yet.
+			// When the last m receives the SIGQUIT, it will fall through to the call to
+			// crash below. Just in case the relaying gets botched, each m involved in
+			// the relay sleeps for 5 seconds and then does the crash/exit itself.
+			// In expected operation, the last m has received the SIGQUIT and run
+			// crash/exit and the process is gone, all long before any of the
+			// 5-second sleeps have finished.
+			print("\n-----\n\n")
+			raiseproc(_SIGQUIT)
+			usleep(5 * 1000 * 1000)
+		}
+		crash()
+	}
+
+	exit(2)
+}