am a529efac: Merge "Add missing cfi directives for x86 assembler."

* commit 'a529efac4efa4641186fef5003752cc1c43ec763':
  Add missing cfi directives for x86 assembler.

libc/arch-x86/bionic/__bionic_clone.S

@@ -3,8 +3,14 @@
 // pid_t __bionic_clone(int flags, void* child_stack, pid_t* parent_tid, void* tls, pid_t* child_tid, int (*fn)(void*), void* arg);
 ENTRY(__bionic_clone)
         pushl   %ebx
+        .cfi_adjust_cfa_offset 4
+        .cfi_rel_offset ebx, 0
         pushl   %esi
+        .cfi_adjust_cfa_offset 4
+        .cfi_rel_offset esi, 0
         pushl   %edi
+        .cfi_adjust_cfa_offset 4
+        .cfi_rel_offset edi, 0
 
         # Load system call arguments into registers.
         movl    16(%esp), %ebx   # flags
@@ -46,8 +52,14 @@ ENTRY(__bionic_clone)
         # We're the parent; nothing to do.
 .L_bc_return:
         popl    %edi
+        .cfi_adjust_cfa_offset -4
+        .cfi_restore edi
         popl    %esi
+        .cfi_adjust_cfa_offset -4
+        .cfi_restore esi
         popl    %ebx
+        .cfi_adjust_cfa_offset -4
+        .cfi_restore ebx
         ret
 END(__bionic_clone)
 .hidden __bionic_clone

libc/arch-x86/bionic/syscall.S

@@ -15,9 +15,17 @@
 ENTRY(syscall)
     # Push the callee save registers.
     push    %ebx
+    .cfi_adjust_cfa_offset 4
+    .cfi_rel_offset ebx, 0
     push    %esi
+    .cfi_adjust_cfa_offset 4
+    .cfi_rel_offset esi, 0
     push    %edi
+    .cfi_adjust_cfa_offset 4
+    .cfi_rel_offset edi, 0
     push    %ebp
+    .cfi_adjust_cfa_offset 4
+    .cfi_rel_offset ebp, 0
 
     # Load all the arguments from the calling frame.
     # (Not all will be valid, depending on the syscall.)
@@ -43,8 +51,16 @@ ENTRY(syscall)
 1:
     # Restore the callee save registers.
     pop    %ebp
+    .cfi_adjust_cfa_offset -4
+    .cfi_restore ebp, 0
     pop    %edi
+    .cfi_adjust_cfa_offset -4
+    .cfi_restore edi, 0
     pop    %esi
+    .cfi_adjust_cfa_offset -4
+    .cfi_restore esi, 0
     pop    %ebx
+    .cfi_adjust_cfa_offset -4
+    .cfi_restore ebx, 0
     ret
 END(syscall)

libc/arch-x86/bionic/vfork.S

@@ -32,6 +32,8 @@
 
 ENTRY(vfork)
   popl    %ecx  // Grab the return address.
+  .cfi_adjust_cfa_offset 4
+  .cfi_rel_offset ecx, 0
   movl    $__NR_vfork, %eax
   int     $0x80
   cmpl    $-MAX_ERRNO, %eax