From: Carlos Montiers <carlos@thefunsouth.com>
Date: Thu, 10 Jul 2014 04:37:20 +0000 (-0400)
Subject: Fix problem using alloca function, executable crashed even with a exception handler... 
X-Git-Tag: release_0_9_27~870
X-Git-Url: https://repo.or.cz/w/tinycc.git/commitdiff_plain/8257829623d484229c9785deedd05375c5732493

Fix problem using alloca function, executable crashed even with a exception handler function, when try to allocate INT_MAX. Patch provided by Jason Hood in private e-mail, when I ask to him for help. He say: Feel free to pass it on to the mailing list.
---

diff --git a/lib/alloca86-bt.S b/lib/alloca86-bt.S
index ffad5156..ff07bbbc 100644
--- a/lib/alloca86-bt.S
+++ b/lib/alloca86-bt.S
@@ -14,10 +14,10 @@ __bound_alloca:
 #ifdef TCC_TARGET_PE
 p4:
     cmp     $4096,%eax
-    jle     p5
+    jb      p5
+    test    %eax,-4096(%esp)
     sub     $4096,%esp
     sub     $4096,%eax
-    test    %eax,(%esp)
     jmp p4
 
 p5:
diff --git a/lib/alloca86.S b/lib/alloca86.S
index b836efbf..5bb38b1f 100644
--- a/lib/alloca86.S
+++ b/lib/alloca86.S
@@ -13,10 +13,10 @@ alloca:
 #ifdef TCC_TARGET_PE
 p1:
     cmp     $4096,%eax
-    jle     p2
+    jb      p2
+    test    %eax,-4096(%esp)
     sub     $4096,%esp
     sub     $4096,%eax
-    test    %eax,(%esp)
     jmp p1
 p2:
 #endif
diff --git a/lib/alloca86_64.S b/lib/alloca86_64.S
index dd46ce6f..51acd424 100644
--- a/lib/alloca86_64.S
+++ b/lib/alloca86_64.S
@@ -17,10 +17,10 @@ alloca:
 #ifdef TCC_TARGET_PE
 p1:
     cmp     $4096,%rax
-    jle     p2
+    jb      p2
+    test    %rax,-4096(%rsp)
     sub     $4096,%rsp
     sub     $4096,%rax
-    test    %rax,(%rsp)
     jmp p1
 p2:
 #endif