[dev.cc] runtime: add explicit siginfo.si_addr field
struct siginfo_t's si_addr field is part of a union.
Previously, we represented this union in Go using an opaque
byte array and accessed the si_addr field using unsafe (and
wrong on 386 and arm!) pointer arithmetic. Since si_addr is
the only field we use from this union, this replaces the
opaque byte array with an explicit declaration of the si_addr
field and accesses it directly.
LGTM=minux, rsc
R=rsc, minux
CC=golang-codereviews
https://golang.org/cl/179970044
diff --git a/src/runtime/signal_linux_power64x.go b/src/runtime/signal_linux_power64x.go
index 8f357033..0a406b3 100644
--- a/src/runtime/signal_linux_power64x.go
+++ b/src/runtime/signal_linux_power64x.go
@@ -56,7 +56,7 @@
func (c *sigctxt) ccr() uint64 { return c.regs().ccr }
func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) }
-func (c *sigctxt) sigaddr() uint64 { return uint64(*(*uintptr)(add(unsafe.Pointer(c.info), 2*ptrSize))) }
+func (c *sigctxt) sigaddr() uint64 { return c.info.si_addr }
func (c *sigctxt) fault() uint64 { return c.regs().dar }
func (c *sigctxt) set_r0(x uint64) { c.regs().gpr[0] = x }
