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c245949ea4
ld.so will now go through all DT_NEEDED entries in the dynamic table and load and relocate those shared libraries as well. Lazy linking of functions via the PLT is not yet supported, all PLT entries are looked up ahead of time by ld.so.
78 lines
2.0 KiB
C++
78 lines
2.0 KiB
C++
#include <stdint.h>
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#include <stdlib.h>
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#include <elf/headers.h>
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#include <j6/init.h>
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#include <j6/protocols/vfs.hh>
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#include <j6/syslog.hh>
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#include <util/pointers.h>
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#include "image.h"
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image_list all_images;
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extern "C" uintptr_t
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ldso_init(j6_arg_header *stack_args, uintptr_t *got)
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{
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j6_arg_loader *arg_loader = nullptr;
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j6_arg_handles *arg_handles = nullptr;
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j6_arg_header *arg = stack_args;
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while (arg && arg->type != j6_arg_type_none) {
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switch (arg->type)
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{
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case j6_arg_type_loader:
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arg_loader = reinterpret_cast<j6_arg_loader*>(arg);
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break;
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case j6_arg_type_handles:
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arg_handles = reinterpret_cast<j6_arg_handles*>(arg);
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break;
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default:
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break;
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}
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arg = util::offset_pointer(arg, arg->size);
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}
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if (!arg_loader) {
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j6::syslog("ld.so: error: did not get j6_arg_loader");
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exit(127);
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}
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j6_handle_t vfs = j6_handle_invalid;
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if (arg_handles) {
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for (size_t i = 0; i < arg_handles->nhandles; ++i) {
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j6_arg_handle_entry &ent = arg_handles->handles[i];
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if (ent.proto == j6::proto::vfs::id) {
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vfs = ent.handle;
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break;
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}
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}
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}
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// First relocate ld.so itself. It cannot have any dependencies
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image_list::item_type ldso_image;
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ldso_image.base = arg_loader->loader_base;
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ldso_image.got = got;
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ldso_image.read_dyn_table(
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reinterpret_cast<const dyn_entry*>(got[0] + arg_loader->loader_base));
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image_list just_ldso;
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just_ldso.push_back(&ldso_image);
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ldso_image.relocate(just_ldso);
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image_list::item_type target_image;
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target_image.base = arg_loader->image_base;
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target_image.got = arg_loader->got;
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target_image.read_dyn_table(
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reinterpret_cast<const dyn_entry*>(arg_loader->got[0] + arg_loader->image_base));
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all_images.push_back(&target_image);
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all_images.load(vfs, 0xb00'0000);
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return arg_loader->entrypoint + arg_loader->image_base;
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}
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