[dev.cc] runtime: convert openbsd/386 port to Go

LGTM=rsc
R=golang-codereviews, bradfitz, rsc
CC=golang-codereviews
https://codereview.appspot.com/173200044

5 files changed, 82 insertions, 52 deletions

diff --git a/src/runtime/defs_openbsd_386.go b/src/runtime/defs_openbsd_386.go
index a6194a4be..d7cdbd227 100644
--- a/src/runtime/defs_openbsd_386.go
+++ b/src/runtime/defs_openbsd_386.go
@@ -85,38 +85,38 @@ const (
 )
 
 type tforkt struct {
-	tf_tcb   *byte
+	tf_tcb   unsafe.Pointer
 	tf_tid   *int32
-	tf_stack *byte
+	tf_stack uintptr
 }
 
 type sigaltstackt struct {
-	ss_sp    *byte
-	ss_size  uint32
+	ss_sp    uintptr
+	ss_size  uintptr
 	ss_flags int32
 }
 
 type sigcontext struct {
-	sc_gs       int32
-	sc_fs       int32
-	sc_es       int32
-	sc_ds       int32
-	sc_edi      int32
-	sc_esi      int32
-	sc_ebp      int32
-	sc_ebx      int32
-	sc_edx      int32
-	sc_ecx      int32
-	sc_eax      int32
-	sc_eip      int32
-	sc_cs       int32
-	sc_eflags   int32
-	sc_esp      int32
-	sc_ss       int32
-	__sc_unused int32
-	sc_mask     int32
-	sc_trapno   int32
-	sc_err      int32
+	sc_gs       uint32
+	sc_fs       uint32
+	sc_es       uint32
+	sc_ds       uint32
+	sc_edi      uint32
+	sc_esi      uint32
+	sc_ebp      uint32
+	sc_ebx      uint32
+	sc_edx      uint32
+	sc_ecx      uint32
+	sc_eax      uint32
+	sc_eip      uint32
+	sc_cs       uint32
+	sc_eflags   uint32
+	sc_esp      uint32
+	sc_ss       uint32
+	__sc_unused uint32
+	sc_mask     uint32
+	sc_trapno   uint32
+	sc_err      uint32
 	sc_fpstate  unsafe.Pointer
 }
 
@@ -128,8 +128,8 @@ type siginfo struct {
 }
 
 type stackt struct {
-	ss_sp    *byte
-	ss_size  uint32
+	ss_sp    uintptr
+	ss_size  uintptr
 	ss_flags int32
 }
 
@@ -138,11 +138,23 @@ type timespec struct {
 	tv_nsec int32
 }
 
+func (ts *timespec) set_sec(x int32) {
+	ts.tv_sec = int64(x)
+}
+
+func (ts *timespec) set_nsec(x int32) {
+	ts.tv_nsec = x
+}
+
 type timeval struct {
 	tv_sec  int64
 	tv_usec int32
 }
 
+func (tv *timeval) set_usec(x int32) {
+	tv.tv_usec = x
+}
+
 type itimerval struct {
 	it_interval timeval
 	it_value    timeval
diff --git a/src/runtime/defs_openbsd_amd64.go b/src/runtime/defs_openbsd_amd64.go
index 9b110239a..122f46cf3 100644
--- a/src/runtime/defs_openbsd_amd64.go
+++ b/src/runtime/defs_openbsd_amd64.go
@@ -92,7 +92,7 @@ type tforkt struct {
 
 type sigaltstackt struct {
 	ss_sp     uintptr
-	ss_size   uint64
+	ss_size   uintptr
 	ss_flags  int32
 	pad_cgo_0 [4]byte
 }
@@ -139,7 +139,7 @@ type siginfo struct {
 
 type stackt struct {
 	ss_sp     uintptr
-	ss_size   uint64
+	ss_size   uintptr
 	ss_flags  int32
 	pad_cgo_0 [4]byte
 }
diff --git a/src/runtime/os1_openbsd.go b/src/runtime/os1_openbsd.go
index 49cc792d3..5c6ea7412 100644
--- a/src/runtime/os1_openbsd.go
+++ b/src/runtime/os1_openbsd.go
@@ -222,7 +222,7 @@ func signalstack(p *byte, n int32) {
 	var st stackt
 
 	st.ss_sp = uintptr(unsafe.Pointer(p))
-	st.ss_size = uint64(n)
+	st.ss_size = uintptr(n)
 	st.ss_flags = 0
 	if p == nil {
 		st.ss_flags = _SS_DISABLE
diff --git a/src/runtime/signal_openbsd_386.go b/src/runtime/signal_openbsd_386.go
new file mode 100644
index 000000000..c582a4493
--- /dev/null
+++ b/src/runtime/signal_openbsd_386.go
@@ -0,0 +1,41 @@
+// 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.
+
+package runtime
+
+import "unsafe"
+
+type sigctxt struct {
+	info *siginfo
+	ctxt unsafe.Pointer
+}
+
+func (c *sigctxt) regs() *sigcontext {
+	return (*sigcontext)(c.ctxt)
+}
+
+func (c *sigctxt) eax() uint32     { return c.regs().sc_eax }
+func (c *sigctxt) ebx() uint32     { return c.regs().sc_ebx }
+func (c *sigctxt) ecx() uint32     { return c.regs().sc_ecx }
+func (c *sigctxt) edx() uint32     { return c.regs().sc_edx }
+func (c *sigctxt) edi() uint32     { return c.regs().sc_edi }
+func (c *sigctxt) esi() uint32     { return c.regs().sc_esi }
+func (c *sigctxt) ebp() uint32     { return c.regs().sc_ebp }
+func (c *sigctxt) esp() uint32     { return c.regs().sc_esp }
+func (c *sigctxt) eip() uint32     { return c.regs().sc_eip }
+func (c *sigctxt) eflags() uint32  { return c.regs().sc_eflags }
+func (c *sigctxt) cs() uint32      { return c.regs().sc_cs }
+func (c *sigctxt) fs() uint32      { return c.regs().sc_fs }
+func (c *sigctxt) gs() uint32      { return c.regs().sc_gs }
+func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) }
+func (c *sigctxt) sigaddr() uint32 {
+	return *(*uint32)(add(unsafe.Pointer(c.info), 12))
+}
+
+func (c *sigctxt) set_eip(x uint32)     { c.regs().sc_eip = x }
+func (c *sigctxt) set_esp(x uint32)     { c.regs().sc_esp = x }
+func (c *sigctxt) set_sigcode(x uint32) { c.info.si_code = int32(x) }
+func (c *sigctxt) set_sigaddr(x uint32) {
+	*(*uint32)(add(unsafe.Pointer(c.info), 12)) = x
+}
diff --git a/src/runtime/signal_openbsd_386.h b/src/runtime/signal_openbsd_386.h
deleted file mode 100644
index 6742db8d4..000000000
--- a/src/runtime/signal_openbsd_386.h
+++ /dev/null
@@ -1,23 +0,0 @@
-// 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.
-
-#define SIG_REGS(ctxt) (*(Sigcontext*)(ctxt))
-
-#define SIG_EAX(info, ctxt) (SIG_REGS(ctxt).sc_eax)
-#define SIG_EBX(info, ctxt) (SIG_REGS(ctxt).sc_ebx)
-#define SIG_ECX(info, ctxt) (SIG_REGS(ctxt).sc_ecx)
-#define SIG_EDX(info, ctxt) (SIG_REGS(ctxt).sc_edx)
-#define SIG_EDI(info, ctxt) (SIG_REGS(ctxt).sc_edi)
-#define SIG_ESI(info, ctxt) (SIG_REGS(ctxt).sc_esi)
-#define SIG_EBP(info, ctxt) (SIG_REGS(ctxt).sc_ebp)
-#define SIG_ESP(info, ctxt) (SIG_REGS(ctxt).sc_esp)
-#define SIG_EIP(info, ctxt) (SIG_REGS(ctxt).sc_eip)
-#define SIG_EFLAGS(info, ctxt) (SIG_REGS(ctxt).sc_eflags)
-
-#define SIG_CS(info, ctxt) (SIG_REGS(ctxt).sc_cs)
-#define SIG_FS(info, ctxt) (SIG_REGS(ctxt).sc_fs)
-#define SIG_GS(info, ctxt) (SIG_REGS(ctxt).sc_gs)
-
-#define SIG_CODE0(info, ctxt) ((info)->si_code)
-#define SIG_CODE1(info, ctxt) (*(uintptr*)((byte*)info + 12))