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Add the ability to copy memory to non resident process.

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Use/Test this by loading the user space elf from the kernel process
before it starts rather than as a part of the first thread.

This simplifies thread start a fair bit.
This commit is contained in:
Drew Galbraith 2023-05-30 01:27:47 -07:00
parent f6609983d2
commit b9b45c5e45
9 changed files with 55 additions and 38 deletions
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14
zion/loader/elf_loader.cpp
View file

@ -46,17 +46,9 @@ typedef struct {
uint64_t align;
} Elf64ProgramHeader;
void badmemcpy(uint64_t base, uint64_t offset, uint64_t dest) {
uint8_t* ptr = reinterpret_cast<uint8_t*>(base);
uint8_t* dest_ptr = reinterpret_cast<uint8_t*>(dest);
for (uint64_t i = 0; i < offset; i++) {
dest_ptr[i] = ptr[i];
}
}
} // namespace
uint64_t LoadElfProgram(uint64_t base, uint64_t offset) {
uint64_t LoadElfProgram(uint64_t cr3, uint64_t base, uint64_t offset) {
Elf64Header* header = reinterpret_cast<Elf64Header*>(base);
dbgln("phoff: %u phnum: %u", header->phoff, header->phnum);
Elf64ProgramHeader* programs =
@ -68,8 +60,8 @@ uint64_t LoadElfProgram(uint64_t base, uint64_t offset) {
"filesz: %u, memsz: %u, align: %u",
program.type, program.flags, program.offset, program.vaddr,
program.paddr, program.filesz, program.memsz, program.align);
EnsureResident(program.vaddr, program.memsz);
badmemcpy(base + program.offset, program.filesz, program.vaddr);
CopyIntoNonResidentProcess(base + program.offset, program.filesz, cr3,
program.vaddr);
}
return header->entry;
}