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Remove poorly implemented kernel symbol loading.

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This commit is contained in:
Jonas 'Sortie' Termansen 2015-11-04 02:37:02 +01:00
parent 08bac6e3f6
commit cfb9dd6045
1 changed files with 0 additions and 108 deletions
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108
kernel/kernel.cpp
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@ -299,114 +299,6 @@ extern "C" void KernelInit(unsigned long magic, multiboot_info_t* bootinfo)
if ( !initrd )
Panic("No init ramdisk provided");
// Load the kernel symbols if provided by the bootloader.
do if ( bootinfo->flags & MULTIBOOT_INFO_ELF_SHDR )
{
// On i386 and x86_64 we identity map the first 4 MiB memory, if the
// debugging sections are outside that region, we can't access them
// directly and we'll have to memory map some physical memory.
// TODO: Correctly handle the memory being outside 4 MiB. You need to
// teach the memory management code to reserve these ranges for
// a while until we have used them and add additional complexity
// in this code.
#define BELOW_4MIB(addr, length) ((addr) + (length) <= 4*1024*1024)
// Find and the verify the section table.
multiboot_elf_section_header_table_t* elf_sec = &bootinfo->u.elf_sec;
if ( !BELOW_4MIB(elf_sec->addr, elf_sec->size) )
{
Log::PrintF("Warning: the section table was loaded inappropriately by the boot loader, kernel debugging symbols will not be available.\n");
break;
}
#define SECTION(num) ((Elf32_Shdr*) ((uintptr_t) elf_sec->addr + (uintptr_t) elf_sec->size * (uintptr_t) (num)))
// Verify the section name section.
Elf32_Shdr* section_string_section = SECTION(elf_sec->shndx);
if ( !BELOW_4MIB(section_string_section->sh_addr, section_string_section->sh_size) )
{
Log::PrintF("Warning: the section string table was loaded inappropriately by the boot loader, kernel debugging symbols will not be available.\n");
break;
}
if ( !section_string_section )
break;
const char* section_string_table = (const char*) (uintptr_t) section_string_section->sh_addr;
// Find the symbol table.
Elf32_Shdr* symbol_table_section = NULL;
for ( unsigned i = 0; i < elf_sec->num && !symbol_table_section; i++ )
{
Elf32_Shdr* section = SECTION(i);
if ( !strcmp(section_string_table + section->sh_name, ".symtab") )
symbol_table_section = section;
}
if ( !symbol_table_section )
break;
if ( !BELOW_4MIB(symbol_table_section->sh_addr, symbol_table_section->sh_size) )
{
Log::PrintF("Warning: the symbol table was loaded inappropriately by the boot loader, kernel debugging symbols will not be available.\n");
break;
}
// Find the symbol string table.
Elf32_Shdr* string_table_section = NULL;
for ( unsigned i = 0; i < elf_sec->num && !string_table_section; i++ )
{
Elf32_Shdr* section = SECTION(i);
if ( !strcmp(section_string_table + section->sh_name, ".strtab") )
string_table_section = section;
}
if ( !string_table_section )
break;
if ( !BELOW_4MIB(string_table_section->sh_addr, string_table_section->sh_size) )
{
Log::PrintF("Warning: the symbol string table was loaded inappropriately by the boot loader, kernel debugging symbols will not be available.\n");
break;
}
// Duplicate the data structures and convert them to the kernel symbol
// table format and register it for later debugging.
const char* elf_string_table = (const char*) (uintptr_t) string_table_section->sh_addr;
size_t elf_string_table_size = string_table_section->sh_size;
Elf32_Sym* elf_symbols = (Elf32_Sym*) (uintptr_t) symbol_table_section->sh_addr;
size_t elf_symbol_count = symbol_table_section->sh_size / sizeof(Elf32_Sym);
if ( !elf_symbol_count || elf_symbol_count == 1 /* null symbol */)
break;
char* string_table = new char[elf_string_table_size];
if ( !string_table )
{
Log::PrintF("Warning: unable to allocate the kernel symbol string table, kernel debugging symbols will not be available.\n");
break;
}
memcpy(string_table, elf_string_table, elf_string_table_size);
Symbol* symbols = new Symbol[elf_symbol_count-1];
if ( !symbols )
{
Log::PrintF("Warning: unable to allocate the kernel symbol table, kernel debugging symbols will not be available.\n");
delete[] string_table;
break;
}
// Copy all entires except the leading null entry.
for ( size_t i = 1; i < elf_symbol_count; i++ )
{
symbols[i-1].address = elf_symbols[i].st_value;
symbols[i-1].size = elf_symbols[i].st_size;
symbols[i-1].name = string_table + elf_symbols[i].st_name;
}
SetKernelSymbolTable(symbols, elf_symbol_count-1);
} while ( false );
// Initialize the interrupt handler table and enable interrupts.
Interrupt::Init();