[Guile-commits] 07/07: Ensure stack alignment in JIT code.

[Andy Wingo]

wingo pushed a commit to branch lightening
in repository guile.

commit 14e64a8b57ff0abb9140db37268ca24fe4980cd0
Author: Andy Wingo <address@hidden>
Date:   Fri Apr 26 12:45:16 2019 +0200

    Ensure stack alignment in JIT code.
    
    * libguile/jit.c (emit_entry_trampoline): Explicitly align stack.
---
 libguile/jit.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libguile/jit.c b/libguile/jit.c
index a531792..f10e267 100644
--- a/libguile/jit.c
+++ b/libguile/jit.c
@@ -1282,6 +1282,8 @@ emit_entry_trampoline (scm_jit_state *j)
     if (jit_fpr_is_callee_save (fprs[i]))
       jit_pushr_d (j->jit, fprs[i]);
 
+  size_t alignment = jit_align_stack (j->jit, 0);
+
   /* Load our reserved registers: THREAD and SP.  Also load IP for the
      mcode jump.  */
   jit_load_args_2 (j->jit, thread_operand (),
@@ -1297,6 +1299,8 @@ emit_entry_trampoline (scm_jit_state *j)
   /* Initialize global exit_mcode to point here.  */
   exit_mcode = jit_address (j->jit);
 
+  jit_shrink_stack (j->jit, alignment);
+
   /* Restore callee-save registers.  */
   for (size_t i = 0; i < fpr_count; i++)
     if (jit_fpr_is_callee_save (fprs[fpr_count - i - 1]))