1 #include "RISCVBaseInfo.h"
2 #include "llvm/ADT/ArrayRef.h"
3 #include "llvm/ADT/Triple.h"
4 #include "llvm/Support/raw_ostream.h"
5
6 namespace llvm {
7 namespace RISCVSysReg {
8 #define GET_SysRegsList_IMPL
9 #include "RISCVGenSystemOperands.inc"
10 } // namespace RISCVSysReg
11
12 namespace RISCVABI {
computeTargetABI(const Triple & TT,FeatureBitset FeatureBits,StringRef ABIName)13 ABI computeTargetABI(const Triple &TT, FeatureBitset FeatureBits,
14 StringRef ABIName) {
15 auto TargetABI = getTargetABI(ABIName);
16 bool IsRV64 = TT.isArch64Bit();
17 bool IsRV32E = FeatureBits[RISCV::FeatureRV32E];
18
19 if (!ABIName.empty() && TargetABI == ABI_Unknown) {
20 errs()
21 << "'" << ABIName
22 << "' is not a recognized ABI for this target (ignoring target-abi)\n";
23 } else if (ABIName.startswith("ilp32") && IsRV64) {
24 errs() << "32-bit ABIs are not supported for 64-bit targets (ignoring "
25 "target-abi)\n";
26 TargetABI = ABI_Unknown;
27 } else if (ABIName.startswith("lp64") && !IsRV64) {
28 errs() << "64-bit ABIs are not supported for 32-bit targets (ignoring "
29 "target-abi)\n";
30 TargetABI = ABI_Unknown;
31 } else if (IsRV32E && TargetABI != ABI_ILP32E && TargetABI != ABI_Unknown) {
32 // TODO: move this checking to RISCVTargetLowering and RISCVAsmParser
33 errs()
34 << "Only the ilp32e ABI is supported for RV32E (ignoring target-abi)\n";
35 TargetABI = ABI_Unknown;
36 }
37
38 if (TargetABI != ABI_Unknown)
39 return TargetABI;
40
41 // For now, default to the ilp32/ilp32e/lp64 ABI if no explicit ABI is given
42 // or an invalid/unrecognised string is given. In the future, it might be
43 // worth changing this to default to ilp32f/lp64f and ilp32d/lp64d when
44 // hardware support for floating point is present.
45 if (IsRV32E)
46 return ABI_ILP32E;
47 if (IsRV64)
48 return ABI_LP64;
49 return ABI_ILP32;
50 }
51
getTargetABI(StringRef ABIName)52 ABI getTargetABI(StringRef ABIName) {
53 auto TargetABI = StringSwitch<ABI>(ABIName)
54 .Case("ilp32", ABI_ILP32)
55 .Case("ilp32f", ABI_ILP32F)
56 .Case("ilp32d", ABI_ILP32D)
57 .Case("ilp32e", ABI_ILP32E)
58 .Case("lp64", ABI_LP64)
59 .Case("lp64f", ABI_LP64F)
60 .Case("lp64d", ABI_LP64D)
61 .Default(ABI_Unknown);
62 return TargetABI;
63 }
64
65 // To avoid the BP value clobbered by a function call, we need to choose a
66 // callee saved register to save the value. RV32E only has X8 and X9 as callee
67 // saved registers and X8 will be used as fp. So we choose X9 as bp.
getBPReg()68 Register getBPReg() { return RISCV::X9; }
69
70 } // namespace RISCVABI
71
72 namespace RISCVFeatures {
73
validate(const Triple & TT,const FeatureBitset & FeatureBits)74 void validate(const Triple &TT, const FeatureBitset &FeatureBits) {
75 if (TT.isArch64Bit() && FeatureBits[RISCV::FeatureRV32E])
76 report_fatal_error("RV32E can't be enabled for an RV64 target");
77 }
78
79 } // namespace RISCVFeatures
80
81 } // namespace llvm
82