Macintosh-Tools/Retro68
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Exceptions now work in multiseg

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This commit is contained in:
Wolfgang Thaller 2017-09-26 20:37:28 +02:00
parent d08331584e
commit 8a2038601a
3 changed files with 44 additions and 5 deletions
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46
Elf2Mac/Elf2Mac.cc
View File

@ -40,6 +40,7 @@
#include <memory>
#include <boost/algorithm/string/predicate.hpp>
#include <boost/lexical_cast.hpp>
using std::string;
using std::unordered_map;
@ -107,11 +108,13 @@ public:
Elf_Data *data;
vector<Symbol> symbols;
map<pair<int,uint32_t>, int> symbolsByAddress;
unordered_map<string, int> symbolsByName;
Symtab(Elf_Scn *elfsec);
Symbol& GetSym(int idx);
int FindSym(int secidx, uint32_t addr);
int FindSym(string name);
};
class Reloc : public GElf_Rela
@ -133,6 +136,7 @@ public:
Elf_Data *data;
GElf_Shdr shdr;
uint32_t outputBase;
uint32_t exceptionInfoStart;
int codeID;
@ -212,18 +216,36 @@ int Symtab::FindSym(int secidx, uint32_t addr)
return -1;
}
int Symtab::FindSym(string name)
{
if(symbolsByName.empty())
{
for(auto& sym : symbols)
if(sym.st_name)
{
symbolsByName[sym.GetName()] = &sym - symbols.data();
}
}
auto p = symbolsByName.find(name);
if(p != symbolsByName.end())
return p->second;
else
return -1;
}
Reloc::Reloc()
{
}
Reloc::Reloc(const GElf_Rela &rela)
: GElf_Rela(rela)
: GElf_Rela(rela), relocBase(RelocBase::code)
{
}
Section::Section(string name, int idx, SectionKind kind, Elf_Scn *elfsec)
: name(name), idx(idx), kind(kind), elfsec(elfsec), relasec(NULL),
exceptionInfoStart(0),
codeID(-1), firstJTEntryIndex(0)
{
data = elf_getdata(elfsec, NULL);
@ -288,7 +310,7 @@ string Section::GetAbsRelocations(bool useOffsets, bool suppressTerminatingEntry
if(useOffsets)
offset -= shdr.sh_addr;
std::cout << "RELA: " << std::hex << offset << " " << (int)rela.relocBase << std::dec << std::endl;
//std::cout << "RELA: " << std::hex << offset << " " << (int)rela.relocBase << std::dec << std::endl;
longword(out, offset | ((int)rela.relocBase << 24));
}
}
@ -348,7 +370,7 @@ void Section::FixRelocs()
{
case SectionKind::code:
relocBase = RelocBase::code;
if(sym.needsJT)
if(sym.needsJT && (exceptionInfoStart == 0 || rela.r_offset < exceptionInfoStart))
{
if(rela.r_addend == 0)
{
@ -644,6 +666,24 @@ void MultiSegmentApp(string output)
sec->outputBase = 4; // standard 'CODE' header
else
sec->outputBase = 40; // far-model 'CODE' header
string exceptionInfoMarker = "__EH_FRAME_BEGIN__";
if(id != 1)
exceptionInfoMarker += boost::lexical_cast<string>(id);
int exceptionInfoSym = symtab->FindSym(exceptionInfoMarker);
if(exceptionInfoSym != -1)
{
Symbol& s = symtab->GetSym(exceptionInfoSym);
sec->exceptionInfoStart = s.st_value;
int codeSize = sec->shdr.sh_size;
int exceptionSize = sec->shdr.sh_addr + codeSize - sec->exceptionInfoStart;
double percent = 100.0 * exceptionSize / codeSize;
std::cout << "CODE " << id << " has " << exceptionSize << " bytes of exception info (" << percent << "%)\n";
}
else
std::cout << "exception info marker not found: " << exceptionInfoMarker << std::endl;
}
dataSection->outputBase = -data_and_bss_size;
bssSection->outputBase = -bssSection->shdr.sh_size;

1
Elf2Mac/LdScript.cc
View File

@ -146,7 +146,6 @@ const char * codeSectionTemplate = R"ld(/* ld script for Elf2Mac */
KEEP(@FILTER@(.gcc_except_table.*))
. = ALIGN(0x4);
LONG(0xDEADBEEF);
. += 32;
LONG(__EH_FRAME_BEGIN__@N@ - .);
}

2
libretro/MultiSegApp.c
View File

@ -120,7 +120,7 @@ pascal void* Retro68LoadSegment(uint8_t *p)
if (__register_frame_info)
{
int32_t offset = ((int32_t*) (base + codeSize))[-1];
void *eh_frame_info = *(void**) (base + codeSize + offset);
void *eh_frame_info = base + codeSize - 4 + offset;
struct object *object = (struct object*) (base + codeSize - 36);
__register_frame_info(eh_frame_info, object);
}