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cmd/internal/obj/riscv: add load, store and multiplication instructions

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Add support for assembling load, store and multiplication instructions.

Based on the riscv-go port.

Updates #27532

Change-Id: Ia7b6e60ae45416a82f240e7b7fc101a36ce18886
Reviewed-on: https://go-review.googlesource.com/c/go/+/195917
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Joel Sing 2019-09-17 04:23:23 +10:00
parent 3507551a1f
commit dfbc9c83a9
2 changed files with 99 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
src/cmd/asm/internal/asm/testdata/riscvenc.s vendored
View File

@ -6,10 +6,6 @@
TEXT asmtest(SB),DUPOK|NOSPLIT,$0
// Arbitrary bytes (entered in little-endian mode)
WORD $0x12345678 // WORD $305419896 // 78563412
WORD $0x9abcdef0 // WORD $2596069104 // f0debc9a
// Unprivileged ISA
// 2.4: Integer Computational Instructions
@ -77,3 +73,49 @@ TEXT asmtest(SB),DUPOK|NOSPLIT,$0
SRA X5, X6 // 33535340
SRA $1, X5, X6 // 13d31240
SRA $1, X5 // 93d21240
// 2.6: Load and Store Instructions
LW $0, X5, X6 // 03a30200
LW $4, X5, X6 // 03a34200
LWU $0, X5, X6 // 03e30200
LWU $4, X5, X6 // 03e34200
LH $0, X5, X6 // 03930200
LH $4, X5, X6 // 03934200
LHU $0, X5, X6 // 03d30200
LHU $4, X5, X6 // 03d34200
LB $0, X5, X6 // 03830200
LB $4, X5, X6 // 03834200
LBU $0, X5, X6 // 03c30200
LBU $4, X5, X6 // 03c34200
SW $0, X5, X6 // 23205300
SW $4, X5, X6 // 23225300
SH $0, X5, X6 // 23105300
SH $4, X5, X6 // 23125300
SB $0, X5, X6 // 23005300
SB $4, X5, X6 // 23025300
// 5.3: Load and Store Instructions (RV64I)
LD $0, X5, X6 // 03b30200
LD $4, X5, X6 // 03b34200
SD $0, X5, X6 // 23305300
SD $4, X5, X6 // 23325300
// 7.1: Multiplication Operations
MUL X5, X6, X7 // b3035302
MULH X5, X6, X7 // b3135302
MULHU X5, X6, X7 // b3335302
MULHSU X5, X6, X7 // b3235302
MULW X5, X6, X7 // bb035302
DIV X5, X6, X7 // b3435302
DIVU X5, X6, X7 // b3535302
REM X5, X6, X7 // b3635302
REMU X5, X6, X7 // b3735302
DIVW X5, X6, X7 // bb435302
DIVUW X5, X6, X7 // bb535302
REMW X5, X6, X7 // bb635302
REMUW X5, X6, X7 // bb735302
// Arbitrary bytes (entered in little-endian mode)
WORD $0x12345678 // WORD $305419896 // 78563412
WORD $0x9abcdef0 // WORD $2596069104 // f0debc9a

53
src/cmd/internal/obj/riscv/obj.go
View File

@ -215,6 +215,12 @@ func validateII(p *obj.Prog) {
wantIntRegAddr(p, "to", &p.To)
}
func validateSI(p *obj.Prog) {
wantImm(p, "from", p.From, 12)
wantIntReg(p, "reg", p.Reg)
wantIntRegAddr(p, "to", &p.To)
}
func validateRaw(p *obj.Prog) {
// Treat the raw value specially as a 32-bit unsigned integer.
// Nobody wants to enter negative machine code.
@ -263,6 +269,21 @@ func encodeII(p *obj.Prog) uint32 {
return encodeI(p, regIAddr(p.To))
}
// encodeS encodes an S-type RISC-V instruction.
func encodeS(p *obj.Prog, rs2 uint32) uint32 {
imm := immI(p.From, 12)
rs1 := regIAddr(p.To)
i := encode(p.As)
if i == nil {
panic("encodeS: could not encode instruction")
}
return (imm>>5)<<25 | rs2<<20 | rs1<<15 | i.funct3<<12 | (imm&0x1f)<<7 | i.opcode
}
func encodeSI(p *obj.Prog) uint32 {
return encodeS(p, regI(p.Reg))
}
// encodeRaw encodes a raw instruction value.
func encodeRaw(p *obj.Prog) uint32 {
// Treat the raw value specially as a 32-bit unsigned integer.
@ -299,6 +320,8 @@ var (
iIEncoding = encoding{encode: encodeII, validate: validateII, length: 4}
sIEncoding = encoding{encode: encodeSI, validate: validateSI, length: 4}
// rawEncoding encodes a raw instruction byte sequence.
rawEncoding = encoding{encode: encodeRaw, validate: validateRaw, length: 4}
@ -338,6 +361,36 @@ var encodingForAs = [ALAST & obj.AMask]encoding{
ASUB & obj.AMask: rIIIEncoding,
ASRA & obj.AMask: rIIIEncoding,
// 2.6: Load and Store Instructions
ALW & obj.AMask: iIEncoding,
ALWU & obj.AMask: iIEncoding,
ALH & obj.AMask: iIEncoding,
ALHU & obj.AMask: iIEncoding,
ALB & obj.AMask: iIEncoding,
ALBU & obj.AMask: iIEncoding,
ASW & obj.AMask: sIEncoding,
ASH & obj.AMask: sIEncoding,
ASB & obj.AMask: sIEncoding,
// 5.3: Load and Store Instructions (RV64I)
ALD & obj.AMask: iIEncoding,
ASD & obj.AMask: sIEncoding,
// 7.1: Multiplication Operations
AMUL & obj.AMask: rIIIEncoding,
AMULH & obj.AMask: rIIIEncoding,
AMULHU & obj.AMask: rIIIEncoding,
AMULHSU & obj.AMask: rIIIEncoding,
AMULW & obj.AMask: rIIIEncoding,
ADIV & obj.AMask: rIIIEncoding,
ADIVU & obj.AMask: rIIIEncoding,
AREM & obj.AMask: rIIIEncoding,
AREMU & obj.AMask: rIIIEncoding,
ADIVW & obj.AMask: rIIIEncoding,
ADIVUW & obj.AMask: rIIIEncoding,
AREMW & obj.AMask: rIIIEncoding,
AREMUW & obj.AMask: rIIIEncoding,
// Escape hatch
AWORD & obj.AMask: rawEncoding,