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cmd/internal/obj/arm64: fix the wrong ROR operator of some instructions

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Instructions such as ADD, SUB, CMP do not support ROR shift operations,
but we have not checked this at present. This CL adds this check.

Change-Id: Icac461f61ad6ddb60886a59ba34dddd29df1cc0f
Reviewed-on: https://go-review.googlesource.com/c/go/+/310035
Reviewed-by: eric fang <eric.fang@arm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: eric fang <eric.fang@arm.com>
Run-TryBot: eric fang <eric.fang@arm.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
eric fang 2021-04-15 03:27:55 +00:00
parent 0636d88f6d
commit 5daefc5363
2 changed files with 67 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
src/cmd/asm/internal/asm/testdata/arm64error.s vendored
View File

@ -32,6 +32,24 @@ TEXT errors(SB),$0
ANDS $0x22220000, R2, RSP // ERROR "illegal combination"
ADD R1, R2, R3, R4 // ERROR "illegal combination"
BICW R7@>33, R5, R16 // ERROR "shift amount out of range 0 to 31"
NEGW R7<<33, R5 // ERROR "shift amount out of range 0 to 31"
NEGSW R7<<33, R5 // ERROR "shift amount out of range 0 to 31"
ADD R7@>2, R5, R16 // ERROR "unsupported shift operator"
ADDW R7@>2, R5, R16 // ERROR "unsupported shift operator"
ADDS R7@>2, R5, R16 // ERROR "unsupported shift operator"
ADDSW R7@>2, R5, R16 // ERROR "unsupported shift operator"
SUB R7@>2, R5, R16 // ERROR "unsupported shift operator"
SUBW R7@>2, R5, R16 // ERROR "unsupported shift operator"
SUBS R7@>2, R5, R16 // ERROR "unsupported shift operator"
SUBSW R7@>2, R5, R16 // ERROR "unsupported shift operator"
CMP R7@>2, R5 // ERROR "unsupported shift operator"
CMPW R7@>2, R5 // ERROR "unsupported shift operator"
CMN R7@>2, R5 // ERROR "unsupported shift operator"
CMNW R7@>2, R5 // ERROR "unsupported shift operator"
NEG R7@>2, R5 // ERROR "unsupported shift operator"
NEGW R7@>2, R5 // ERROR "unsupported shift operator"
NEGS R7@>2, R5 // ERROR "unsupported shift operator"
NEGSW R7@>2, R5 // ERROR "unsupported shift operator"
CINC CS, R2, R3, R4 // ERROR "illegal combination"
CSEL LT, R1, R2 // ERROR "illegal combination"
LDP.P 8(R2), (R2, R3) // ERROR "constrained unpredictable behavior"

93
src/cmd/internal/obj/arm64/asm7.go
View File

@ -321,12 +321,12 @@ var optab = []Optab{
{ACMP, C_VCON, C_REG, C_NONE, C_NONE, 13, 20, 0, 0, 0},
{AADD, C_SHIFT, C_REG, C_NONE, C_REG, 3, 4, 0, 0, 0},
{AADD, C_SHIFT, C_NONE, C_NONE, C_REG, 3, 4, 0, 0, 0},
{AADD, C_SHIFT, C_RSP, C_NONE, C_RSP, 107, 4, 0, 0, 0},
{AADD, C_SHIFT, C_NONE, C_NONE, C_RSP, 107, 4, 0, 0, 0},
{AADD, C_SHIFT, C_RSP, C_NONE, C_RSP, 26, 4, 0, 0, 0},
{AADD, C_SHIFT, C_NONE, C_NONE, C_RSP, 26, 4, 0, 0, 0},
{AMVN, C_SHIFT, C_NONE, C_NONE, C_REG, 3, 4, 0, 0, 0},
{ACMP, C_SHIFT, C_REG, C_NONE, C_NONE, 3, 4, 0, 0, 0},
{ACMP, C_SHIFT, C_RSP, C_NONE, C_NONE, 107, 4, 0, 0, 0},
{ANEG, C_SHIFT, C_NONE, C_NONE, C_REG, 26, 4, 0, 0, 0},
{ACMP, C_SHIFT, C_RSP, C_NONE, C_NONE, 26, 4, 0, 0, 0},
{ANEG, C_SHIFT, C_NONE, C_NONE, C_REG, 3, 4, 0, 0, 0},
{AADD, C_REG, C_RSP, C_NONE, C_RSP, 27, 4, 0, 0, 0},
{AADD, C_REG, C_NONE, C_NONE, C_RSP, 27, 4, 0, 0, 0},
{ACMP, C_REG, C_RSP, C_NONE, C_NONE, 27, 4, 0, 0, 0},
@ -1355,6 +1355,14 @@ func isADDSop(op obj.As) bool {
return false
}
func isNEGop(op obj.As) bool {
switch op {
case ANEG, ANEGW, ANEGS, ANEGSW:
return true
}
return false
}
func isRegShiftOrExt(a *obj.Addr) bool {
return (a.Index-obj.RBaseARM64)&REG_EXT != 0 || (a.Index-obj.RBaseARM64)&REG_LSL != 0
}
@ -3251,13 +3259,17 @@ func (c *ctxt7) asmout(p *obj.Prog, o *Optab, out []uint32) {
if is64bit == 0 && amount >= 32 {
c.ctxt.Diag("shift amount out of range 0 to 31: %v", p)
}
shift := (p.From.Offset >> 22) & 3
if (shift > 2 || shift < 0) && (isADDop(p.As) || isADDWop(p.As) || isNEGop(p.As)) {
c.ctxt.Diag("unsupported shift operator: %v", p)
}
o1 |= uint32(p.From.Offset) /* includes reg, op, etc */
rt := int(p.To.Reg)
if p.To.Type == obj.TYPE_NONE {
rt = REGZERO
}
r := int(p.Reg)
if p.As == AMVN || p.As == AMVNW {
if p.As == AMVN || p.As == AMVNW || isNEGop(p.As) {
r = REGZERO
} else if r == 0 {
r = rt
@ -3665,12 +3677,40 @@ func (c *ctxt7) asmout(p *obj.Prog, o *Optab, out []uint32) {
rt := int(p.To.Reg)
o1 |= (uint32(rf&31) << 16) | (REGZERO & 31 << 5) | uint32(rt&31)
case 26: /* negX Rm<<s, Rd -> subX Rm<<s, ZR, Rd */
o1 = c.oprrr(p, p.As)
case 26: // op R<<n, RSP, RSP (extended register)
// Refer to ARM reference manual, if "Rd" or "Rn" is RSP,
// it can be encoded as op(extended regster) instruction.
if !(p.To.Reg == REGSP || p.Reg == REGSP) {
c.ctxt.Diag("expected SP reference: %v", p)
break
}
if p.To.Reg == REGSP && (p.As == AADDS || p.As == AADDSW || p.As == ASUBS || p.As == ASUBSW) {
c.ctxt.Diag("unexpected SP reference: %v", p)
break
}
amount := (p.From.Offset >> 10) & 63
shift := (p.From.Offset >> 22) & 3
if shift != 0 {
c.ctxt.Diag("illegal combination: %v", p)
break
}
o1 |= uint32(p.From.Offset) /* includes reg, op, etc */
if amount > 4 {
c.ctxt.Diag("the left shift amount out of range 0 to 4: %v", p)
break
}
rf := (p.From.Offset >> 16) & 31
rt := int(p.To.Reg)
o1 |= (REGZERO & 31 << 5) | uint32(rt&31)
r := int(p.Reg)
if p.To.Type == obj.TYPE_NONE {
rt = REGZERO
}
if r == 0 {
r = rt
}
o1 = c.opxrrr(p, p.As, false)
o1 |= uint32(rf)<<16 | uint32(amount&7)<<10 | (uint32(r&31) << 5) | uint32(rt&31)
case 27: /* op Rm<<n[,Rn],Rd (extended register) */
if p.To.Reg == REG_RSP && isADDSop(p.As) {
@ -5492,41 +5532,6 @@ func (c *ctxt7) asmout(p *obj.Prog, o *Optab, out []uint32) {
c.ctxt.Diag("illegal destination register: %v\n", p)
}
o1 |= enc | uint32(rs&31)<<16 | uint32(rb&31)<<5 | uint32(rt&31)
case 107: // op R<<n, RSP, RSP (extended register)
// Refer to ARM reference manual, if "Rd" or "Rn" is RSP,
// it can be encoded as op(extended regster) instruction.
if !(p.To.Reg == REGSP || p.Reg == REGSP) {
c.ctxt.Diag("expected SP reference: %v", p)
break
}
if p.To.Reg == REGSP && (p.As == AADDS || p.As == AADDSW || p.As == ASUBS || p.As == ASUBSW) {
c.ctxt.Diag("unexpected SP reference: %v", p)
break
}
amount := (p.From.Offset >> 10) & 63
shift := (p.From.Offset >> 22) & 3
if shift != 0 {
c.ctxt.Diag("illegal combination: %v", p)
break
}
if amount > 4 {
c.ctxt.Diag("the left shift amount out of range 0 to 4: %v", p)
break
}
rf := (p.From.Offset >> 16) & 31
rt := int(p.To.Reg)
r := int(p.Reg)
if p.To.Type == obj.TYPE_NONE {
rt = REGZERO
}
if r == 0 {
r = rt
}
o1 = c.opxrrr(p, p.As, false)
o1 |= uint32(rf)<<16 | uint32(amount&7)<<10 | (uint32(r&31) << 5) | uint32(rt&31)
}
out[0] = o1
out[1] = o2