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#include <stdbool.h>
#include <lib/elf.h>
bool elf64_validate(Elf64_Ehdr *ehdr, unsigned type, unsigned machine)
{
if (ehdr->e_ident[EI_MAG0] != ELFMAG0
|| ehdr->e_ident[EI_MAG1] != ELFMAG1
|| ehdr->e_ident[EI_MAG2] != ELFMAG2
|| ehdr->e_ident[EI_MAG3] != ELFMAG3
|| ehdr->e_ident[EI_CLASS] != ELFCLASS64
|| ehdr->e_ident[EI_DATA] != ELFDATA2LSB
|| ehdr->e_ident[EI_VERSION] != EV_CURRENT
|| ehdr->e_machine != machine
|| ehdr->e_type != type)
{
return false;
}
return true;
}
size_t elf64_size(Elf64_Ehdr *ehdr, Elf64_Phdr *phdrs)
{
size_t size = 0;
for (int i = 0; i < ehdr->e_phnum; i++)
{
if (phdrs[i].p_type != PT_LOAD)
{
continue;
}
size = phdrs[i].p_offset + phdrs[i].p_memsz;
if (phdrs[i].p_align > 1)
{
size = (size + phdrs[i].p_align - 1) & ~(phdrs[i].p_align - 1);
}
}
return size;
}
static Elf64_Dyn *get_dynent(Elf64_Dyn *dyntab, unsigned long dt_type)
{
while (dyntab && dyntab->d_tag != DT_NULL)
{
if (dyntab->d_tag == dt_type)
{
return dyntab;
}
dyntab++;
}
return nullptr;
}
void *elf64_dt_ptr(void *base, Elf64_Dyn *dyntab, unsigned long dt_type)
{
Elf64_Dyn *dynent = get_dynent(dyntab, dt_type);
if (dynent == nullptr)
{
return nullptr;
}
return dynent->d_ptr + (char *)base;
}
uintptr_t elf64_dt_val(Elf64_Dyn *dyntab, unsigned long dt_type)
{
Elf64_Dyn *dynent = get_dynent(dyntab, dt_type);
if (dynent == nullptr)
{
return (uintptr_t)-1;
}
return dynent->d_val;
}
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