From 5d9a3fa54d45074dff635b255424b7f83a5bdba4 Mon Sep 17 00:00:00 2001
From: Max Wash <mbswash@gmail.com>
Date: Sat, 21 Mar 2026 10:53:10 +0000
Subject: [PATCH] lib: launch: implement GLOB_DAT and RELATIVE relocations

---
 lib/liblaunch/elf.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/lib/liblaunch/elf.c b/lib/liblaunch/elf.c
index 76a5946..f4f350a 100644
--- a/lib/liblaunch/elf.c
+++ b/lib/liblaunch/elf.c
@@ -334,6 +334,28 @@ static enum launch_status do_rela(struct elf_image *image, elf_rela_t *rela)
 			ELF64_R_SYM(rela->r_info),
 			rela->r_addend);
 		break;
+	case R_X86_64_GLOB_DAT:
+		sym = get_dynsym(image, ELF64_R_SYM(rela->r_info));
+		if (!sym) {
+			return LAUNCH_ERR_MISSING_SYMBOL;
+		}
+
+		*(uint64_t *)(image->e_local_base + rela->r_offset)
+			= image->e_remote_base + sym->st_value + rela->r_addend;
+		kern_tracef(
+			"GLOB_DAT: offset=%zx, symbol=%zu, addend=%zx",
+			rela->r_offset,
+			ELF64_R_SYM(rela->r_info),
+			rela->r_addend);
+		break;
+	case R_X86_64_RELATIVE:
+		*(uint64_t *)(image->e_local_base + rela->r_offset)
+			= image->e_remote_base + rela->r_addend;
+		kern_tracef(
+			"RELATIVE: offset=%zx, addend=%zx",
+			rela->r_offset,
+			rela->r_addend);
+		break;
 	default:
 		kern_trace("Unknown relocation type");
 		return LAUNCH_ERR_UNSUPPORTED_EXECUTABLE;