linux-kernel - [ 114/117] x86, relocs: When printing an error, say relative or absolute

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Date:	Mon, 28 May 2012 04:13:56 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, "H. Peter Anvin" <hpa@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [ 114/117] x86, relocs: When printing an error, say relative or absolute

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "H. Peter Anvin" <hpa@...ux.intel.com>

commit 24ab82bd9bf18f3efc69a131d73577940941e1b7 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@...or.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/x86/tools/relocs.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
index c3cfbb2..b43cfcd 100644
--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
@@ -563,10 +563,14 @@ 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:
@@ -582,7 +586,7 @@ 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))
@@ -598,7 +602,7 @@ 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))
@@ -616,7 +620,8 @@ 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);
 			}
 		}


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