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ELFLoader works inside the kernel!

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We load /_hello.o which just prints out a simple message.
It executes inside the kernel itself, so no fancy userspace process
or anything, but this is still so cool!
This commit is contained in:
Andreas Kling 2018-10-18 15:38:04 +02:00
parent 6ab0649ad6
commit 97e0d75bcb
Notes: sideshowbarker 2024-07-19 18:46:15 +09:00
10 changed files with 72 additions and 15 deletions
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22
Kernel/init.cpp
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@ -23,6 +23,7 @@
#include <VirtualFileSystem/FileHandle.h>
#include <AK/OwnPtr.h>
#include "MemoryManager.h"
#include <ELFLoader/ELFLoader.h>
#if 0
/* Keyboard LED disco task ;^) */
@ -82,6 +83,8 @@ static void user_kprintf_main()
DO_SYSCALL_A1(0x4000, 0);
kprintf("This should not work!\n");
HANG;
for (;;) {
}
}
system_t system;
@ -179,6 +182,25 @@ void init()
}
#endif
{
auto testExecutable = vfs->open("/_hello.o");
ASSERT(testExecutable);
auto testExecutableData = testExecutable->readEntireFile();
ASSERT(testExecutableData);
ExecSpace space;
space.loadELF(move(testExecutableData));
auto* elf_entry = space.symbolPtr("elf_entry");
ASSERT(elf_entry);
typedef int (*MainFunctionPtr)(void);
kprintf("elf_entry: %p\n", elf_entry);
int rc = reinterpret_cast<MainFunctionPtr>(elf_entry)();
kprintf("it returned %d\n", rc);
HANG;
}
// The idle task will spend its eternity here for now.
for (;;) {
asm("hlt");