objtool: Support '-mtune=atom' stack frame setup instruction

[cascardo/linux.git] / tools / objtool / arch / x86 / decode.c

diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c
index c0c0b26..b63a31b 100644 (file)
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -98,6 +98,15 @@ int arch_decode_instruction(struct elf *elf, struct section *sec,
                        *type = INSN_FP_SETUP;
                break;
 
+       case 0x8d:
+               if (insn.rex_prefix.bytes &&
+                   insn.rex_prefix.bytes[0] == 0x48 &&
+                   insn.modrm.nbytes && insn.modrm.bytes[0] == 0x2c &&
+                   insn.sib.nbytes && insn.sib.bytes[0] == 0x24)
+                       /* lea %(rsp), %rbp */
+                       *type = INSN_FP_SETUP;
+               break;
+
        case 0x90:
                *type = INSN_NOP;
                break;