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mesosphere: refactor Elf vs Elf64 distinction

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This commit is contained in:
Michael Scire 2019-12-17 15:02:59 -08:00 committed by SciresM
parent d3b697fd1d
commit d10621e832
5 changed files with 31 additions and 31 deletions
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20
libraries/libmesosphere/include/mesosphere/init/kern_init_elf.hpp
View file

@ -17,17 +17,25 @@
#include <vapours.hpp>
#ifdef ATMOSPHERE_ARCH_ARM64
#include "../arch/arm64/init/kern_init_elf64.hpp"
#include "kern_init_elf64.hpp"
#else
#error "Unknown Architecture"
#endif
namespace ams::kern::init::Elf {
/* TODO: Anything we want inside this namespace? */
#ifdef ATMOSPHERE_ARCH_ARM64
using namespace ams::kern::init::Elf::Elf64;
enum RelocationType {
R_ARCHITECTURE_RELATIVE = 0x403, /* Real name R_AARCH64_RELATIVE */
};
#else
#error "Unknown Architecture"
#endif
/* API to apply relocations or call init array. */
void ApplyRelocations(uintptr_t base_address, const Dyn *dynamic);
void CallInitArrayFuncs(uintptr_t init_array_start, uintptr_t init_array_end);
}

8
libraries/libmesosphere/include/mesosphere/arch/arm64/init/kern_init_elf64.hpp → libraries/libmesosphere/include/mesosphere/init/kern_init_elf64.hpp
View file

@ -125,12 +125,4 @@ namespace ams::kern::init::Elf::Elf64 {
DT_RELCOUNT = 0x6ffffffa
};
enum RelocationType {
R_AARCH64_RELATIVE = 0x403,
};
/* API to apply relocations or call init array. */
void ApplyRelocations(uintptr_t base_address, const Dyn *dynamic);
void CallInitArrayFuncs(uintptr_t init_array_start, uintptr_t init_array_end);
}

18
libraries/libmesosphere/source/arch/arm64/init/kern_init_elf64.cpp → libraries/libmesosphere/source/init/kern_init_elf.cpp
View file

@ -15,7 +15,7 @@
*/
#include <mesosphere.hpp>
namespace ams::kern::init::Elf::Elf64 {
namespace ams::kern::init::Elf {
/* API to apply relocations or call init array. */
void ApplyRelocations(uintptr_t base_address, const Dyn *dynamic) {
@ -52,25 +52,25 @@ namespace ams::kern::init::Elf::Elf64 {
/* Apply all Rel relocations */
for (size_t i = 0; i < rel_count; i++) {
const auto &rel = *reinterpret_cast<const Elf64::Rel *>(dyn_rel + rel_ent * i);
const auto &rel = *reinterpret_cast<const Elf::Rel *>(dyn_rel + rel_ent * i);
/* Only allow R_AARCH64_RELATIVE relocations. */
while (rel.GetType() != R_AARCH64_RELATIVE) { /* ... */ }
/* Only allow architecture-specific relocations. */
while (rel.GetType() != R_ARCHITECTURE_RELATIVE) { /* ... */ }
/* Apply the relocation. */
Elf64::Addr *target_address = reinterpret_cast<Elf64::Addr *>(base_address + rel.GetOffset());
Elf::Addr *target_address = reinterpret_cast<Elf::Addr *>(base_address + rel.GetOffset());
*target_address += base_address;
}
/* Apply all Rela relocations. */
for (size_t i = 0; i < rela_count; i++) {
const auto &rela = *reinterpret_cast<const Elf64::Rela *>(dyn_rela + rela_ent * i);
const auto &rela = *reinterpret_cast<const Elf::Rela *>(dyn_rela + rela_ent * i);
/* Only allow R_AARCH64_RELATIVE relocations. */
while (rela.GetType() != R_AARCH64_RELATIVE) { /* ... */ }
/* Only allow architecture-specific relocations. */
while (rela.GetType() != R_ARCHITECTURE_RELATIVE) { /* ... */ }
/* Apply the relocation. */
Elf64::Addr *target_address = reinterpret_cast<Elf64::Addr *>(base_address + rela.GetOffset());
Elf::Addr *target_address = reinterpret_cast<Elf::Addr *>(base_address + rela.GetOffset());
*target_address = base_address + rela.GetAddend();
}
}

6
mesosphere/kernel_ldr/source/kern_init_loader.cpp
View file

@ -320,14 +320,14 @@ namespace ams::kern::init::loader {
std::memset(GetVoidPointer(virtual_base_address + bss_offset), 0, bss_end_offset - bss_offset);
/* Apply relocations to the kernel. */
const Elf::Elf64::Dyn *kernel_dynamic = reinterpret_cast<const Elf::Elf64::Dyn *>(GetInteger(virtual_base_address) + dynamic_offset);
Elf::Elf64::ApplyRelocations(GetInteger(virtual_base_address), kernel_dynamic);
const Elf::Dyn *kernel_dynamic = reinterpret_cast<const Elf::Dyn *>(GetInteger(virtual_base_address) + dynamic_offset);
Elf::ApplyRelocations(GetInteger(virtual_base_address), kernel_dynamic);
/* Reprotect .rodata as R-- */
ttbr1_table.Reprotect(virtual_base_address + ro_offset, ro_end_offset - ro_offset, KernelRwDataAttribute, KernelRoDataAttribute);
/* Call the kernel's init array functions. */
Elf::Elf64::CallInitArrayFuncs(GetInteger(virtual_base_address) + init_array_offset, GetInteger(virtual_base_address) + init_array_end_offset);
Elf::CallInitArrayFuncs(GetInteger(virtual_base_address) + init_array_offset, GetInteger(virtual_base_address) + init_array_end_offset);
/* Return the difference between the random virtual base and the physical base. */
return GetInteger(virtual_base_address) - base_address;

8
mesosphere/kernel_ldr/source/start.s
View file

@ -48,17 +48,17 @@ _start:
ldr x1, [x1, #0x18] /* .dynamic. */
add x1, x0, x1
/* branch to ams::kern::init::Elf::Elf64::ApplyRelocations(uintptr_t, const ams::kern::init::Elf::Elf64::Dyn *); */
bl _ZN3ams4kern4init3Elf5Elf6416ApplyRelocationsEmPKNS3_3DynE
/* branch to ams::kern::init::Elf::ApplyRelocations(uintptr_t, const ams::kern::init::Elf::Elf64::Dyn *); */
bl _ZN3ams4kern4init3Elf16ApplyRelocationsEmPKNS2_5Elf643DynE
/* branch to ams::kern::init::Elf::Elf64::CallInitArrayFuncs(uintptr_t, uintptr_t) */
/* branch to ams::kern::init::Elf::CallInitArrayFuncs(uintptr_t, uintptr_t) */
adr x2, _start
adr x1, __external_references
ldr x0, [x1, #0x20] /* init_array_start */
ldr x1, [x1, #0x28] /* init_array_end */
add x0, x0, x2
add x1, x1, x2
bl _ZN3ams4kern4init3Elf5Elf6418CallInitArrayFuncsEmm
bl _ZN3ams4kern4init3Elf18CallInitArrayFuncsEmm
/* Setup system registers, for detection of errors during init later. */
msr tpidr_el1, xzr /* Clear TPIDR_EL1 */