[RFC 23/31] objtool: Handle __pa_symbol() relocations

[Josh Poimboeuf]

A relocation created by __pa_symbol() has a large addend referring to a
physical address.  Convert it to back its virtual form before
calculating the addend.

Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
---
 tools/objtool/arch/x86/decode.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c
index afebd67d9b9d..5468fd15f380 100644
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -67,6 +67,17 @@ bool arch_callee_saved_reg(unsigned char reg)
 	}
 }
 
+/* undo the effects of __pa_symbol() if necessary */
+static unsigned long phys_to_virt(unsigned long pa)
+{
+	s64 va = pa;
+
+	if (va > 0)
+		va &= ~(0x80000000);
+
+	return va;
+}
+
 s64 arch_insn_adjusted_addend(struct instruction *insn, struct reloc *reloc)
 {
 	s64 addend = reloc_addend(reloc);
@@ -80,7 +91,7 @@ s64 arch_insn_adjusted_addend(struct instruction *insn, struct reloc *reloc)
 		break;
 	}
 
-	return addend;
+	return phys_to_virt(addend);
 }
 
 unsigned long arch_jump_destination(struct instruction *insn)
-- 
2.45.2