[Guile-commits] 01/02: Ensure 32 bytes of stack are reserved on 64-bit Windows targets

[Andy Wingo]

wingo pushed a commit to branch master
in repository guile.

commit a96c0188f196acb46fdee3bd0c20575db6c945a9
Author: Andy Wingo <address@hidden>
AuthorDate: Mon Feb 17 22:01:14 2020 +0100

    Ensure 32 bytes of stack are reserved on 64-bit Windows targets
    
    * lightening/x86.c (reset_abi_arg_iterator): Reserve 32 stack bytes on
      64-bit Windows systems, in accordance with ABI.  Thanks a million to
      Charles Stanhope for the patch and to Mike Gran for testing!
---
 lightening/x86.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lightening/x86.c b/lightening/x86.c
index 965191a..bdd26e1 100644
--- a/lightening/x86.c
+++ b/lightening/x86.c
@@ -328,6 +328,10 @@ reset_abi_arg_iterator(struct abi_arg_iterator *iter, 
size_t argc,
   memset(iter, 0, sizeof *iter);
   iter->argc = argc;
   iter->args = args;
+#if __CYGWIN__ && __X64
+  // Reserve slots on the stack for 4 register parameters (8 bytes each).
+  iter->stack_size = 32;
+#endif
 }
 
 static void