| 1 | section .data |
| 2 | |
| 3 | bits 32 |
| 4 | |
| 5 | global multiboot_reloc_stub |
| 6 | multiboot_reloc_stub: |
| 7 | jmp .code |
| 8 | |
| 9 | times 4-($-multiboot_reloc_stub) db 0 |
| 10 | |
| 11 | ; EBX = self |
| 12 | ; ESI = magic value |
| 13 | ; EDI = protocol info |
| 14 | ; ECX = entry point |
| 15 | ; EAX = ranges |
| 16 | ; EDX = ranges count |
| 17 | |
| 18 | .code: |
| 19 | mov esp, ebx |
| 20 | add esp, .mini_stack_top - multiboot_reloc_stub |
| 21 | |
| 22 | push edi |
| 23 | push esi |
| 24 | push ecx |
| 25 | |
| 26 | .ranges_loop: |
| 27 | test edx, edx ; Loop until we're done |
| 28 | jz .ranges_loop_out |
| 29 | |
| 30 | mov esi, [eax] ; ESI = range.elsewhere |
| 31 | mov edi, [eax+8] ; EDI = range.target |
| 32 | mov ecx, [eax+16] ; ECX = range.length |
| 33 | rep movsb ; Copy range to target location |
| 34 | |
| 35 | add eax, 24 ; Move to the next range |
| 36 | |
| 37 | dec edx |
| 38 | jmp .ranges_loop |
| 39 | |
| 40 | .ranges_loop_out: |
| 41 | ; We're done relocating! |
| 42 | pop ecx |
| 43 | pop esi |
| 44 | pop edi |
| 45 | |
| 46 | push ecx |
| 47 | |
| 48 | mov eax, esi ; EAX = magic value |
| 49 | mov ebx, edi ; EBX = protocol info |
| 50 | xor ecx, ecx |
| 51 | xor edx, edx |
| 52 | xor esi, esi |
| 53 | xor edi, edi |
| 54 | xor ebp, ebp |
| 55 | |
| 56 | ret |
| 57 | |
| 58 | align 16 |
| 59 | .mini_stack: |
| 60 | times 3 dq 0 |
| 61 | .mini_stack_top: |
| 62 | |
| 63 | global multiboot_reloc_stub_end |
| 64 | multiboot_reloc_stub_end: |
| 65 | |
| 66 | section .note.GNU-stack noalloc noexec nowrite progbits |
