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cmd/internal/obj/arm64: fix handling of unaligned offset between 256 and 504

Browse source 
C_PPAUTO was matching offsets that is a multiple 8. But this
condition is dropped in CL 55610, causing unaligned offset
between 256 and 504 mistakenly matched to some classes, e.g.
C_UAUTO8K. This CL restores this condition, also fixes an
error that C_PPAUTO shouldn't match C_PSAUTO, because the
latter is not guaranteed to be multiple of 8. C_PPAUTO_8 is
unnecessary, removed.

Fixes #21992.

Change-Id: I75d5a0e5f5dc3dae335721fbec1bbcd4a3b862f2
Reviewed-on: https://go-review.googlesource.com/65730
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Cherry Zhang 2017-09-23 16:03:43 -04:00
parent 6b8a3c8889
commit a92a77c56f
4 changed files with 41 additions and 44 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
src/cmd/internal/obj/arm64/a.out.go
View file

@ -293,8 +293,7 @@ const (
C_NSAUTO // -256 <= x < 0
C_PSAUTO_8 // 0 to 255, 0 mod 8
C_PSAUTO // 0 to 255
C_PPAUTO_8 // 0 to 504, 0 mod 8
C_PPAUTO // 0 to 504
C_PPAUTO // 0 to 504, 0 mod 8
C_UAUTO4K_8 // 0 to 4095, 0 mod 8
C_UAUTO4K_4 // 0 to 4095, 0 mod 4
C_UAUTO4K_2 // 0 to 4095, 0 mod 2
@ -319,7 +318,6 @@ const (
C_NSOREG
C_PSOREG_8
C_PSOREG
C_PPOREG_8
C_PPOREG
C_UOREG4K_8
C_UOREG4K_4

2
src/cmd/internal/obj/arm64/anames7.go
View file

@ -37,7 +37,6 @@ var cnames7 = []string{
"NSAUTO",
"PSAUTO_8",
"PSAUTO",
"PPAUTO_8",
"PPAUTO",
"UAUTO4K_8",
"UAUTO4K_4",
@ -61,7 +60,6 @@ var cnames7 = []string{
"NSOREG",
"PSOREG_8",
"PSOREG",
"PPOREG_8",
"PPOREG",
"UOREG4K_8",
"UOREG4K_4",

63
src/cmd/internal/obj/arm64/asm7.go
View file

@ -432,9 +432,9 @@ var optab = []Optab{
{ALDP, C_NPAUTO, C_NONE, C_PAIR, 66, 4, REGSP, 0, 0},
{ALDP, C_NPAUTO, C_NONE, C_PAIR, 66, 4, REGSP, 0, C_XPRE},
{ALDP, C_NPAUTO, C_NONE, C_PAIR, 66, 4, REGSP, 0, C_XPOST},
{ALDP, C_PPAUTO_8, C_NONE, C_PAIR, 66, 4, REGSP, 0, 0},
{ALDP, C_PPAUTO_8, C_NONE, C_PAIR, 66, 4, REGSP, 0, C_XPRE},
{ALDP, C_PPAUTO_8, C_NONE, C_PAIR, 66, 4, REGSP, 0, C_XPOST},
{ALDP, C_PPAUTO, C_NONE, C_PAIR, 66, 4, REGSP, 0, 0},
{ALDP, C_PPAUTO, C_NONE, C_PAIR, 66, 4, REGSP, 0, C_XPRE},
{ALDP, C_PPAUTO, C_NONE, C_PAIR, 66, 4, REGSP, 0, C_XPOST},
{ALDP, C_UAUTO4K, C_NONE, C_PAIR, 74, 8, REGSP, 0, 0},
{ALDP, C_UAUTO4K, C_NONE, C_PAIR, 74, 8, REGSP, 0, C_XPRE},
{ALDP, C_UAUTO4K, C_NONE, C_PAIR, 74, 8, REGSP, 0, C_XPOST},
@ -444,9 +444,9 @@ var optab = []Optab{
{ALDP, C_NPOREG, C_NONE, C_PAIR, 66, 4, 0, 0, 0},
{ALDP, C_NPOREG, C_NONE, C_PAIR, 66, 4, 0, 0, C_XPRE},
{ALDP, C_NPOREG, C_NONE, C_PAIR, 66, 4, 0, 0, C_XPOST},
{ALDP, C_PPOREG_8, C_NONE, C_PAIR, 66, 4, 0, 0, 0},
{ALDP, C_PPOREG_8, C_NONE, C_PAIR, 66, 4, 0, 0, C_XPRE},
{ALDP, C_PPOREG_8, C_NONE, C_PAIR, 66, 4, 0, 0, C_XPOST},
{ALDP, C_PPOREG, C_NONE, C_PAIR, 66, 4, 0, 0, 0},
{ALDP, C_PPOREG, C_NONE, C_PAIR, 66, 4, 0, 0, C_XPRE},
{ALDP, C_PPOREG, C_NONE, C_PAIR, 66, 4, 0, 0, C_XPOST},
{ALDP, C_UOREG4K, C_NONE, C_PAIR, 74, 8, 0, 0, 0},
{ALDP, C_UOREG4K, C_NONE, C_PAIR, 74, 8, 0, 0, C_XPRE},
{ALDP, C_UOREG4K, C_NONE, C_PAIR, 74, 8, 0, 0, C_XPOST},
@ -457,9 +457,9 @@ var optab = []Optab{
{ASTP, C_PAIR, C_NONE, C_NPAUTO, 67, 4, REGSP, 0, 0},
{ASTP, C_PAIR, C_NONE, C_NPAUTO, 67, 4, REGSP, 0, C_XPRE},
{ASTP, C_PAIR, C_NONE, C_NPAUTO, 67, 4, REGSP, 0, C_XPOST},
{ASTP, C_PAIR, C_NONE, C_PPAUTO_8, 67, 4, REGSP, 0, 0},
{ASTP, C_PAIR, C_NONE, C_PPAUTO_8, 67, 4, REGSP, 0, C_XPRE},
{ASTP, C_PAIR, C_NONE, C_PPAUTO_8, 67, 4, REGSP, 0, C_XPOST},
{ASTP, C_PAIR, C_NONE, C_PPAUTO, 67, 4, REGSP, 0, 0},
{ASTP, C_PAIR, C_NONE, C_PPAUTO, 67, 4, REGSP, 0, C_XPRE},
{ASTP, C_PAIR, C_NONE, C_PPAUTO, 67, 4, REGSP, 0, C_XPOST},
{ASTP, C_PAIR, C_NONE, C_UAUTO4K, 76, 8, REGSP, 0, 0},
{ASTP, C_PAIR, C_NONE, C_UAUTO4K, 76, 8, REGSP, 0, C_XPRE},
{ASTP, C_PAIR, C_NONE, C_UAUTO4K, 76, 8, REGSP, 0, C_XPOST},
@ -469,9 +469,9 @@ var optab = []Optab{
{ASTP, C_PAIR, C_NONE, C_NPOREG, 67, 4, 0, 0, 0},
{ASTP, C_PAIR, C_NONE, C_NPOREG, 67, 4, 0, 0, C_XPRE},
{ASTP, C_PAIR, C_NONE, C_NPOREG, 67, 4, 0, 0, C_XPOST},
{ASTP, C_PAIR, C_NONE, C_PPOREG_8, 67, 4, 0, 0, 0},
{ASTP, C_PAIR, C_NONE, C_PPOREG_8, 67, 4, 0, 0, C_XPRE},
{ASTP, C_PAIR, C_NONE, C_PPOREG_8, 67, 4, 0, 0, C_XPOST},
{ASTP, C_PAIR, C_NONE, C_PPOREG, 67, 4, 0, 0, 0},
{ASTP, C_PAIR, C_NONE, C_PPOREG, 67, 4, 0, 0, C_XPRE},
{ASTP, C_PAIR, C_NONE, C_PPOREG, 67, 4, 0, 0, C_XPOST},
{ASTP, C_PAIR, C_NONE, C_UOREG4K, 76, 8, 0, 0, 0},
{ASTP, C_PAIR, C_NONE, C_UOREG4K, 76, 8, 0, 0, C_XPRE},
{ASTP, C_PAIR, C_NONE, C_UOREG4K, 76, 8, 0, 0, C_XPOST},
@ -808,7 +808,6 @@ func (c *ctxt7) addpool(p *obj.Prog, a *obj.Addr) {
case C_PSAUTO,
C_PSAUTO_8,
C_PPAUTO,
C_PPAUTO_8,
C_UAUTO4K_8,
C_UAUTO4K_4,
C_UAUTO4K_2,
@ -823,7 +822,6 @@ func (c *ctxt7) addpool(p *obj.Prog, a *obj.Addr) {
C_NPAUTO,
C_LAUTO,
C_PPOREG,
C_PPOREG_8,
C_PSOREG,
C_PSOREG_8,
C_UOREG4K_8,
@ -1051,10 +1049,7 @@ func autoclass(l int64) int {
}
return C_PSAUTO
}
if l <= 504 {
if (l & 7) == 0 {
return C_PPAUTO_8
}
if l <= 504 && l&7 == 0 {
return C_PPAUTO
}
if l <= 4095 {
@ -1457,36 +1452,31 @@ func cmp(a int, b int) bool {
}
case C_PPAUTO:
if b == C_PSAUTO || b == C_PSAUTO_8 {
return true
}
case C_PPAUTO_8:
if b == C_PSAUTO_8 {
return true
}
case C_UAUTO4K:
switch b {
case C_PSAUTO, C_PSAUTO_8, C_PPAUTO, C_PPAUTO_8, C_UAUTO4K_2, C_UAUTO4K_4, C_UAUTO4K_8:
case C_PSAUTO, C_PSAUTO_8, C_PPAUTO, C_UAUTO4K_2, C_UAUTO4K_4, C_UAUTO4K_8:
return true
}
case C_UAUTO8K:
switch b {
case C_PSAUTO, C_PSAUTO_8, C_PPAUTO, C_PPAUTO_8, C_UAUTO4K_2, C_UAUTO4K_4, C_UAUTO4K_8, C_UAUTO8K_4, C_UAUTO8K_8:
case C_PSAUTO, C_PSAUTO_8, C_PPAUTO, C_UAUTO4K_2, C_UAUTO4K_4, C_UAUTO4K_8, C_UAUTO8K_4, C_UAUTO8K_8:
return true
}
case C_UAUTO16K:
switch b {
case C_PSAUTO, C_PSAUTO_8, C_PPAUTO, C_PPAUTO_8, C_UAUTO4K_4, C_UAUTO4K_8, C_UAUTO8K_4, C_UAUTO8K_8, C_UAUTO16K_8:
case C_PSAUTO, C_PSAUTO_8, C_PPAUTO, C_UAUTO4K_4, C_UAUTO4K_8, C_UAUTO8K_4, C_UAUTO8K_8, C_UAUTO16K_8:
return true
}
case C_UAUTO32K:
switch b {
case C_PSAUTO, C_PSAUTO_8, C_PPAUTO, C_PPAUTO_8, C_UAUTO4K_8, C_UAUTO8K_8, C_UAUTO16K_8:
case C_PSAUTO, C_PSAUTO_8, C_PPAUTO, C_UAUTO4K_8, C_UAUTO8K_8, C_UAUTO16K_8:
return true
}
@ -1495,7 +1485,7 @@ func cmp(a int, b int) bool {
case C_LAUTO:
switch b {
case C_PSAUTO, C_PSAUTO_8, C_PPAUTO, C_PPAUTO_8,
case C_PSAUTO, C_PSAUTO_8, C_PPAUTO,
C_UAUTO4K, C_UAUTO4K_2, C_UAUTO4K_4, C_UAUTO4K_8,
C_UAUTO8K, C_UAUTO8K_4, C_UAUTO8K_8,
C_UAUTO16K, C_UAUTO16K_8,
@ -1511,36 +1501,31 @@ func cmp(a int, b int) bool {
case C_PPOREG:
switch b {
case C_ZOREG, C_PSOREG, C_PSOREG_8, C_PPOREG_8:
return true
}
case C_PPOREG_8:
if b == C_ZOREG || b == C_PSOREG_8 {
case C_ZOREG, C_PSOREG_8:
return true
}
case C_UOREG4K:
switch b {
case C_ZOREG, C_PSOREG_8, C_PSOREG, C_PPOREG_8, C_PPOREG, C_UOREG4K_2, C_UOREG4K_4, C_UOREG4K_8:
case C_ZOREG, C_PSOREG_8, C_PSOREG, C_PPOREG, C_UOREG4K_2, C_UOREG4K_4, C_UOREG4K_8:
return true
}
case C_UOREG8K:
switch b {
case C_ZOREG, C_PSOREG_8, C_PSOREG, C_PPOREG_8, C_PPOREG, C_UOREG4K_2, C_UOREG4K_4, C_UOREG4K_8, C_UOREG8K_4, C_UOREG8K_8:
case C_ZOREG, C_PSOREG_8, C_PSOREG, C_PPOREG, C_UOREG4K_2, C_UOREG4K_4, C_UOREG4K_8, C_UOREG8K_4, C_UOREG8K_8:
return true
}
case C_UOREG16K:
switch b {
case C_ZOREG, C_PSOREG_8, C_PSOREG, C_PPOREG_8, C_PPOREG, C_UOREG4K_4, C_UOREG4K_8, C_UOREG8K_4, C_UOREG8K_8, C_UOREG16K_8:
case C_ZOREG, C_PSOREG_8, C_PSOREG, C_PPOREG, C_UOREG4K_4, C_UOREG4K_8, C_UOREG8K_4, C_UOREG8K_8, C_UOREG16K_8:
return true
}
case C_UOREG32K:
switch b {
case C_ZOREG, C_PSOREG_8, C_PSOREG, C_PPOREG_8, C_PPOREG, C_UOREG4K_8, C_UOREG8K_8, C_UOREG16K_8:
case C_ZOREG, C_PSOREG_8, C_PSOREG, C_PPOREG, C_UOREG4K_8, C_UOREG8K_8, C_UOREG16K_8:
return true
}
@ -1549,7 +1534,7 @@ func cmp(a int, b int) bool {
case C_LOREG:
switch b {
case C_ZOREG, C_PSOREG_8, C_PSOREG, C_PPOREG_8, C_PPOREG,
case C_ZOREG, C_PSOREG_8, C_PSOREG, C_PPOREG,
C_UOREG4K, C_UOREG4K_2, C_UOREG4K_4, C_UOREG4K_8,
C_UOREG8K, C_UOREG8K_4, C_UOREG8K_8,
C_UOREG16K, C_UOREG16K_8,

16
test/fixedbugs/issue19137.go
View file

@ -33,3 +33,19 @@ func zero() ([20]byte, [20]byte) {
_ = x
return [20]byte{}, [20]byte{} // the second return value is not 8-byte aligned to SP
}
// Issue 21992: unaligned offset between 256 and 504 and handled
// incorrectly.
type T2 struct {
a [257]byte
// fields below are not 8-, 4-, 2-byte aligned
b [8]byte
c [4]byte
d [2]byte
}
func f2(x *T2) {
x.b = [8]byte{}
x.c = [4]byte{}
x.d = [2]byte{}
}