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cmd/internal/obj/arm64: add checks for incorrect use of REGTMP register

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The current assembler uses REGTMP as a temporary destination register,
when optimizing one instruction into a multi-instruction sequence. But
in some cases, when the source register is REGTMP, this behavior is
incorrect.

For example:
  ADD	$0x1234567, R27, R3

The current assembler encodes it into
  MOVD	$17767, R27
  MOVK	$(291<<16), R27
  ADD	R27, R27, R3

It is illegal to overwrite R27. This CL adds the related checks.

Add test cases.

Change-Id: I0af373d9fd23d8f067c093778dd4cc76748faf38
Reviewed-on: https://go-review.googlesource.com/c/go/+/344689
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: fannie zhang <Fannie.Zhang@arm.com>
This commit is contained in:
fanzha02 2021-08-24 12:46:54 +08:00 committed by fannie zhang
parent 42563f89d7
commit 9cbc76bdf9
2 changed files with 35 additions and 7 deletions
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7
src/cmd/asm/internal/asm/testdata/arm64error.s vendored
View File

@ -423,4 +423,11 @@ TEXT errors(SB),$0
MOVD.W x-8(SP), R1 // ERROR "illegal combination"
LDP.P x+8(FP), (R0, R1) // ERROR "illegal combination"
LDP.W x+8(SP), (R0, R1) // ERROR "illegal combination"
ADD $0x1234567, R27, R3 // ERROR "cannot use REGTMP as source"
ADD $0x3fffffffc000, R27, R5 // ERROR "cannot use REGTMP as source"
AND $0x22220000, R27, R4 // ERROR "cannot use REGTMP as source"
ANDW $0x6006000060060, R27, R5 // ERROR "cannot use REGTMP as source"
STP (R3, R4), 0x1234567(R27) // ERROR "REGTMP used in large offset store"
LDP 0x1234567(R27), (R3, R4) // ERROR "REGTMP used in large offset load"
STP (R26, R27), 700(R2) // ERROR "cannot use REGTMP as source"
RET

21
src/cmd/internal/obj/arm64/asm7.go
View File

@ -3407,6 +3407,9 @@ func (c *ctxt7) asmout(p *obj.Prog, o *Optab, out []uint32) {
o4 = os[3]
case 13: /* addop $vcon, [R], R (64 bit literal); cmp $lcon,R -> addop $lcon,R, ZR */
if p.Reg == REGTMP {
c.ctxt.Diag("cannot use REGTMP as source: %v\n", p)
}
if p.To.Reg == REG_RSP && isADDSop(p.As) {
c.ctxt.Diag("illegal destination register: %v\n", p)
}
@ -3724,6 +3727,9 @@ func (c *ctxt7) asmout(p *obj.Prog, o *Optab, out []uint32) {
o1 |= (uint32(r&31) << 5) | uint32(rt&31)
case 28: /* logop $vcon, [R], R (64 bit literal) */
if p.Reg == REGTMP {
c.ctxt.Diag("cannot use REGTMP as source: %v\n", p)
}
o := uint32(0)
num := uint8(0)
cls := oclass(&p.From)
@ -4354,6 +4360,9 @@ func (c *ctxt7) asmout(p *obj.Prog, o *Optab, out []uint32) {
/* reloc ops */
case 64: /* movT R,addr -> adrp + add + movT R, (REGTMP) */
if p.From.Reg == REGTMP {
c.ctxt.Diag("cannot use REGTMP as source: %v\n", p)
}
o1 = ADR(1, 0, REGTMP)
o2 = c.opirr(p, AADD) | REGTMP&31<<5 | REGTMP&31
rel := obj.Addrel(c.cursym)
@ -4585,6 +4594,9 @@ func (c *ctxt7) asmout(p *obj.Prog, o *Optab, out []uint32) {
// add Rtmp, R, Rtmp
// ldp (Rtmp), (R1, R2)
r := int(p.From.Reg)
if r == REGTMP {
c.ctxt.Diag("REGTMP used in large offset load: %v", p)
}
if r == obj.REG_NONE {
r = int(o.param)
}
@ -4601,6 +4613,9 @@ func (c *ctxt7) asmout(p *obj.Prog, o *Optab, out []uint32) {
case 76:
// add $O, R, Rtmp or sub $O, R, Rtmp
// stp (R1, R2), (Rtmp)
if p.From.Reg == REGTMP || p.From.Offset == REGTMP {
c.ctxt.Diag("cannot use REGTMP as source: %v", p)
}
r := int(p.To.Reg)
if r == obj.REG_NONE {
r = int(o.param)
@ -4628,6 +4643,9 @@ func (c *ctxt7) asmout(p *obj.Prog, o *Optab, out []uint32) {
// add Rtmp, R, Rtmp
// stp (R1, R2), (Rtmp)
r := int(p.To.Reg)
if r == REGTMP || p.From.Reg == REGTMP || p.From.Offset == REGTMP {
c.ctxt.Diag("REGTMP used in large offset store: %v", p)
}
if r == obj.REG_NONE {
r = int(o.param)
}
@ -4933,6 +4951,9 @@ func (c *ctxt7) asmout(p *obj.Prog, o *Optab, out []uint32) {
o1 |= (uint32(Q&1) << 30) | (uint32((r>>5)&7) << 16) | (uint32(r&0x1f) << 5) | uint32(rt&31)
case 87: /* stp (r,r), addr(SB) -> adrp + add + stp */
if p.From.Reg == REGTMP || p.From.Offset == REGTMP {
c.ctxt.Diag("cannot use REGTMP as source: %v", p)
}
o1 = ADR(1, 0, REGTMP)
o2 = c.opirr(p, AADD) | REGTMP&31<<5 | REGTMP&31
rel := obj.Addrel(c.cursym)