runtime,cmd/link: merge pcbucketsize const into internal/abi

For #59670

Change-Id: I53e100362325472fd16a986c49ad94bb2c77244f

Author: qiulaidongfeng

src/cmd/link/internal/ld/pcln.go

@@ -827,9 +827,8 @@ func expandGoroot(s string) string {
 }
 
 const (
-	BUCKETSIZE    = 256 * abi.MINFUNC
 	SUBBUCKETS    = 16
-	SUBBUCKETSIZE = BUCKETSIZE / SUBBUCKETS
+	SUBBUCKETSIZE = abi.Pcbucketsize / SUBBUCKETS
 	NOIDX         = 0x7fffffff
 )
 
@@ -847,7 +846,7 @@ func (ctxt *Link) findfunctab(state *pclntab, container loader.Bitmap) {
 	// that map to that subbucket.
 	n := int32((max - min + SUBBUCKETSIZE - 1) / SUBBUCKETSIZE)
 
-	nbuckets := int32((max - min + BUCKETSIZE - 1) / BUCKETSIZE)
+	nbuckets := int32((max - min + abi.Pcbucketsize - 1) / abi.Pcbucketsize)
 
 	size := 4*int64(nbuckets) + int64(n)
 

src/internal/abi/symtab.go

@@ -107,3 +107,5 @@ const (
 )
 
 const MINFUNC = 16 // minimum size for a function
+
+const Pcbucketsize = 256 * MINFUNC // size of bucket in the pc->func lookup table

src/runtime/symtab.go

@@ -497,8 +497,6 @@ type textsect struct {
 	baseaddr uintptr // relocated section address
 }
 
-const pcbucketsize = 256 * abi.MINFUNC // size of bucket in the pc->func lookup table
-
 // findfuncbucket is an array of these structures.
 // Each bucket represents 4096 bytes of the text segment.
 // Each subbucket represents 256 bytes of the text segment.
@@ -780,8 +778,8 @@ func findfunc(pc uintptr) funcInfo {
 	}
 
 	x := uintptr(pcOff) + datap.text - datap.minpc // TODO: are datap.text and datap.minpc always equal?
-	b := x / pcbucketsize
-	i := x % pcbucketsize / (pcbucketsize / nsub)
+	b := x / abi.Pcbucketsize
+	i := x % abi.Pcbucketsize / (abi.Pcbucketsize / nsub)
 
 	ffb := (*findfuncbucket)(add(unsafe.Pointer(datap.findfunctab), b*unsafe.Sizeof(findfuncbucket{})))
 	idx := ffb.idx + uint32(ffb.subbuckets[i])