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[boot][kernel] Split programs into sections

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To enable setting sections as NX or read-only, the boot program loader
now loads programs as lists of sections, and the kernel args are updated
accordingly. The kernel's loader now just takes a program pointer to
iterate the sections. Also enable NX in IA32_EFER in the bootloader.
This commit is contained in:
Justin C. Miller
2021-01-20 01:25:47 -08:00
parent 14aad62e02
commit cb612c36ea
13 changed files with 140 additions and 61 deletions
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13
src/boot/loader.cpp
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@@ -87,6 +87,9 @@ load_program(
bs->set_mem(pages, total_size, 0);
program.base = prog_base;
program.total_size = total_size;
program.num_sections = 0;
for (int i = 0; i < header->ph_num; ++i) {
ptrdiff_t offset = header->ph_offset + i * header->ph_entsize;
const elf::program_header *pheader =
@@ -95,14 +98,18 @@ load_program(
if (pheader->type != elf::PT_LOAD)
continue;
args::program_section &section = program.sections[program.num_sections++];
void *src_start = offset_ptr<void>(data.data, pheader->offset);
void *dest_start = offset_ptr<void>(pages, pheader->vaddr - prog_base);
bs->copy_mem(dest_start, src_start, pheader->file_size);
section.phys_addr = reinterpret_cast<uintptr_t>(dest_start);
section.virt_addr = pheader->vaddr;
section.size = pheader->mem_size;
section.type = static_cast<args::section_flags>(pheader->flags);
}
program.phys_addr = reinterpret_cast<uintptr_t>(pages);
program.size = total_size;
program.virt_addr = prog_base;
program.entrypoint = header->entrypoint;
}