xref: /freebsd/contrib/llvm-project/clang/lib/Driver/ToolChains/Arch/M68k.cpp (revision a4e5e0106ac7145f56eb39a691e302cabb4635be)
1 //===--- M68k.cpp - M68k Helpers for Tools -------------------*- C++-*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "M68k.h"
10 #include "ToolChains/CommonArgs.h"
11 #include "clang/Driver/Driver.h"
12 #include "clang/Driver/DriverDiagnostic.h"
13 #include "clang/Driver/Options.h"
14 #include "llvm/ADT/SmallVector.h"
15 #include "llvm/ADT/StringSwitch.h"
16 #include "llvm/Option/ArgList.h"
17 #include "llvm/Support/Regex.h"
18 #include "llvm/TargetParser/Host.h"
19 #include <sstream>
20 
21 using namespace clang::driver;
22 using namespace clang::driver::tools;
23 using namespace clang;
24 using namespace llvm::opt;
25 
26 /// getM68kTargetCPU - Get the (LLVM) name of the 68000 cpu we are targeting.
27 std::string m68k::getM68kTargetCPU(const ArgList &Args) {
28   if (Arg *A = Args.getLastArg(clang::driver::options::OPT_mcpu_EQ)) {
29     // The canonical CPU name is captalize. However, we allow
30     // starting with lower case or numbers only
31     StringRef CPUName = A->getValue();
32 
33     if (CPUName == "native") {
34       std::string CPU = std::string(llvm::sys::getHostCPUName());
35       if (!CPU.empty() && CPU != "generic")
36         return CPU;
37     }
38 
39     if (CPUName == "common")
40       return "generic";
41 
42     return llvm::StringSwitch<std::string>(CPUName)
43         .Cases("m68000", "68000", "M68000")
44         .Cases("m68010", "68010", "M68010")
45         .Cases("m68020", "68020", "M68020")
46         .Cases("m68030", "68030", "M68030")
47         .Cases("m68040", "68040", "M68040")
48         .Cases("m68060", "68060", "M68060")
49         .Default(CPUName.str());
50   }
51   // FIXME: Throw error when multiple sub-architecture flag exist
52   if (Args.hasArg(clang::driver::options::OPT_m68000))
53     return "M68000";
54   if (Args.hasArg(clang::driver::options::OPT_m68010))
55     return "M68010";
56   if (Args.hasArg(clang::driver::options::OPT_m68020))
57     return "M68020";
58   if (Args.hasArg(clang::driver::options::OPT_m68030))
59     return "M68030";
60   if (Args.hasArg(clang::driver::options::OPT_m68040))
61     return "M68040";
62   if (Args.hasArg(clang::driver::options::OPT_m68060))
63     return "M68060";
64 
65   return "";
66 }
67 
68 static void addFloatABIFeatures(const llvm::opt::ArgList &Args,
69                                 std::vector<llvm::StringRef> &Features) {
70   Arg *A = Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
71                            options::OPT_m68881);
72   // Opt out FPU even for newer CPUs.
73   if (A && A->getOption().matches(options::OPT_msoft_float)) {
74     Features.push_back("-isa-68881");
75     Features.push_back("-isa-68882");
76     return;
77   }
78 
79   std::string CPU = m68k::getM68kTargetCPU(Args);
80   // Only enable M68881 for CPU < 68020 if the related flags are present.
81   if ((A && (CPU == "M68000" || CPU == "M68010")) ||
82       // Otherwise, by default we assume newer CPUs have M68881/2.
83       CPU == "M68020")
84     Features.push_back("+isa-68881");
85   else if (CPU == "M68030" || CPU == "M68040" || CPU == "M68060")
86     // Note that although CPU >= M68040 imply M68882, we still add `isa-68882`
87     // anyway so that it's easier to add or not add the corresponding macro
88     // definitions later, in case we want to disable 68881/2 in newer CPUs
89     // (with -msoft-float, for instance).
90     Features.push_back("+isa-68882");
91 }
92 
93 void m68k::getM68kTargetFeatures(const Driver &D, const llvm::Triple &Triple,
94                                  const ArgList &Args,
95                                  std::vector<StringRef> &Features) {
96   addFloatABIFeatures(Args, Features);
97 
98   // Handle '-ffixed-<register>' flags
99   if (Args.hasArg(options::OPT_ffixed_a0))
100     Features.push_back("+reserve-a0");
101   if (Args.hasArg(options::OPT_ffixed_a1))
102     Features.push_back("+reserve-a1");
103   if (Args.hasArg(options::OPT_ffixed_a2))
104     Features.push_back("+reserve-a2");
105   if (Args.hasArg(options::OPT_ffixed_a3))
106     Features.push_back("+reserve-a3");
107   if (Args.hasArg(options::OPT_ffixed_a4))
108     Features.push_back("+reserve-a4");
109   if (Args.hasArg(options::OPT_ffixed_a5))
110     Features.push_back("+reserve-a5");
111   if (Args.hasArg(options::OPT_ffixed_a6))
112     Features.push_back("+reserve-a6");
113   if (Args.hasArg(options::OPT_ffixed_d0))
114     Features.push_back("+reserve-d0");
115   if (Args.hasArg(options::OPT_ffixed_d1))
116     Features.push_back("+reserve-d1");
117   if (Args.hasArg(options::OPT_ffixed_d2))
118     Features.push_back("+reserve-d2");
119   if (Args.hasArg(options::OPT_ffixed_d3))
120     Features.push_back("+reserve-d3");
121   if (Args.hasArg(options::OPT_ffixed_d4))
122     Features.push_back("+reserve-d4");
123   if (Args.hasArg(options::OPT_ffixed_d5))
124     Features.push_back("+reserve-d5");
125   if (Args.hasArg(options::OPT_ffixed_d6))
126     Features.push_back("+reserve-d6");
127   if (Args.hasArg(options::OPT_ffixed_d7))
128     Features.push_back("+reserve-d7");
129 }
130