x86, relocs: When printing an error, say relative or absolute

commit 24ab82bd upstream.

When the relocs tool throws an error, let the error message say if it
is an absolute or relative symbol.  This should make it a lot more
clear what action the programmer needs to take and should help us find
the reason if additional symbol bugs show up.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

arch/x86/tools/relocs.c

@@ -562,10 +562,14 @@ static void walk_relocs(void (*visit)(Elf32_Rel *rel, Elf32_Sym *sym),
 			Elf32_Sym *sym;
 			unsigned r_type;
 			const char *symname;
+			int shn_abs;
+
 			rel = &sec->reltab[j];
 			sym = &sh_symtab[ELF32_R_SYM(rel->r_info)];
 			r_type = ELF32_R_TYPE(rel->r_info);
 
+			shn_abs = sym->st_shndx == SHN_ABS;
+
 			switch (r_type) {
 			case R_386_NONE:
 			case R_386_PC32:
@@ -581,7 +585,7 @@ static void walk_relocs(void (*visit)(Elf32_Rel *rel, Elf32_Sym *sym),
 				symname = sym_name(sym_strtab, sym);
 				if (!use_real_mode)
 					goto bad;
-				if (sym->st_shndx == SHN_ABS) {
+				if (shn_abs) {
 					if (is_reloc(S_ABS, symname))
 						break;
 					else if (!is_reloc(S_SEG, symname))
@@ -597,7 +601,7 @@ static void walk_relocs(void (*visit)(Elf32_Rel *rel, Elf32_Sym *sym),
 
 			case R_386_32:
 				symname = sym_name(sym_strtab, sym);
-				if (sym->st_shndx == SHN_ABS) {
+				if (shn_abs) {
 					if (is_reloc(S_ABS, symname))
 						break;
 					else if (!is_reloc(S_REL, symname))
@@ -615,7 +619,8 @@ static void walk_relocs(void (*visit)(Elf32_Rel *rel, Elf32_Sym *sym),
 				break;
 			bad:
 				symname = sym_name(sym_strtab, sym);
-				die("Invalid %s relocation: %s\n",
+				die("Invalid %s %s relocation: %s\n",
+				    shn_abs ? "absolute" : "relative",
 				    rel_type(r_type), symname);
 			}
 		}