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[srv.init] Allow init loader to load dynamic ELFs

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Use the `elf::file::valid()` change to allow the loader to load `ET_DYN`
binaries, and add a static offset to all load addresses for them.
This commit is contained in:
Justin C. Miller
2023-08-06 10:42:25 -07:00
parent b239bb6df2
commit ce27749705
1 changed files with 6 additions and 4 deletions
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10
src/user/srv.init/loader.cpp
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@@ -43,8 +43,10 @@ load_program(
uintptr_t base_address = reinterpret_cast<uintptr_t>(data.pointer);
elf::file progelf {data};
bool dyn = progelf.type() == elf::filetype::shared;
uintptr_t image_base = dyn ? 0xa'0000'0000 : 0;
if (!progelf.valid()) {
if (!progelf.valid(dyn ? elf::filetype::shared : elf::filetype::executable)) {
j6::syslog(" ** error loading program '%s': ELF is invalid", name);
return false;
}
@@ -80,7 +82,7 @@ load_program(
uintptr_t start = base_address + seg.offset;
size_t prologue = seg.vaddr & 0xfff;
size_t epilogue = seg.mem_size - (prologue+seg.file_size);
size_t epilogue = seg.mem_size - seg.file_size;
j6_handle_t sub_vma = j6_handle_invalid;
res = j6_vma_create_map(&sub_vma, seg.mem_size+prologue, load_addr, flags);
@@ -95,7 +97,7 @@ load_program(
memcpy(dest+prologue, src, seg.file_size);
memset(dest+prologue+seg.file_size, 0, epilogue);
res = j6_vma_map(sub_vma, proc, seg.vaddr & ~0xfffull);
res = j6_vma_map(sub_vma, proc, (image_base + seg.vaddr) & ~0xfffull);
if (res != j6_status_ok) {
j6::syslog(" ** error loading program '%s': mapping sub vma to child: %lx", name, res);
return false;
@@ -144,7 +146,7 @@ load_program(
}
j6_handle_t thread = j6_handle_invalid;
res = j6_thread_create(&thread, proc, stack_top - stack_consumed, progelf.entrypoint(), arg0, 0);
res = j6_thread_create(&thread, proc, stack_top - stack_consumed, image_base + progelf.entrypoint(), image_base, arg1);
if (res != j6_status_ok) {
j6::syslog(" ** error loading program '%s': creating thread: %lx", name, res);
return false;