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jit: add support for relr-type relocations

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This commit is contained in:
Liam 2023-10-11 11:13:19 -04:00
parent 84b0e29b56
commit 7b5d234558
2 changed files with 42 additions and 2 deletions
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8
src/common/elf.h
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@ -211,6 +211,11 @@ struct Elf64_Rela {
Elf64_Sxword r_addend; /* Addend */
};
/* RELR relocation table entry */
using Elf32_Relr = Elf32_Word;
using Elf64_Relr = Elf64_Xword;
/* How to extract and insert information held in the r_info field. */
static inline u32 Elf32RelSymIndex(Elf32_Word r_info) {
@ -328,6 +333,9 @@ constexpr u32 ElfDtFiniArray = 26; /* Array with addresses of fini fct */
constexpr u32 ElfDtInitArraySz = 27; /* Size in bytes of DT_INIT_ARRAY */
constexpr u32 ElfDtFiniArraySz = 28; /* Size in bytes of DT_FINI_ARRAY */
constexpr u32 ElfDtSymtabShndx = 34; /* Address of SYMTAB_SHNDX section */
constexpr u32 ElfDtRelrsz = 35; /* Size of RELR relative relocations */
constexpr u32 ElfDtRelr = 36; /* Address of RELR relative relocations */
constexpr u32 ElfDtRelrent = 37; /* Size of one RELR relative relocation */
} // namespace ELF
} // namespace Common

36
src/core/hle/service/jit/jit_context.cpp
View file

@ -156,6 +156,8 @@ public:
bool LoadNRO(std::span<const u8> data) {
local_memory.clear();
relocbase = local_memory.size();
local_memory.insert(local_memory.end(), data.begin(), data.end());
if (FixupRelocations()) {
@ -181,8 +183,8 @@ public:
// https://refspecs.linuxbase.org/elf/gabi4+/ch5.dynamic.html
// https://refspecs.linuxbase.org/elf/gabi4+/ch4.reloc.html
VAddr dynamic_offset{mod_offset + callbacks->MemoryRead32(mod_offset + 4)};
VAddr rela_dyn = 0;
size_t num_rela = 0;
VAddr rela_dyn = 0, relr_dyn = 0;
size_t num_rela = 0, num_relr = 0;
while (true) {
const auto dyn{callbacks->ReadMemory<Elf64_Dyn>(dynamic_offset)};
dynamic_offset += sizeof(Elf64_Dyn);
@ -196,6 +198,12 @@ public:
if (dyn.d_tag == ElfDtRelasz) {
num_rela = dyn.d_un.d_val / sizeof(Elf64_Rela);
}
if (dyn.d_tag == ElfDtRelr) {
relr_dyn = dyn.d_un.d_ptr;
}
if (dyn.d_tag == ElfDtRelrsz) {
num_relr = dyn.d_un.d_val / sizeof(Elf64_Relr);
}
}
for (size_t i = 0; i < num_rela; i++) {
@ -207,6 +215,29 @@ public:
callbacks->MemoryWrite64(rela.r_offset, contents + rela.r_addend);
}
VAddr relr_where = 0;
for (size_t i = 0; i < num_relr; i++) {
const auto relr{callbacks->ReadMemory<Elf64_Relr>(relr_dyn + i * sizeof(Elf64_Relr))};
const auto incr{[&](VAddr where) {
callbacks->MemoryWrite64(where, callbacks->MemoryRead64(where) + relocbase);
}};
if ((relr & 1) == 0) {
// where pointer
relr_where = relocbase + relr;
incr(relr_where);
relr_where += sizeof(Elf64_Addr);
} else {
// bitmap
for (int bit = 1; bit < 64; bit++) {
if ((relr & (1ULL << bit)) != 0) {
incr(relr_where + i * sizeof(Elf64_Addr));
}
}
relr_where += 63 * sizeof(Elf64_Addr);
}
}
return true;
}
@ -313,6 +344,7 @@ public:
Core::Memory::Memory& memory;
VAddr top_of_stack;
VAddr heap_pointer;
VAddr relocbase;
};
void DynarmicCallbacks64::CallSVC(u32 swi) {