From: Aleksey Demakov <ademakov@gmail.com>
Date: Thu, 25 Jan 2007 20:55:53 +0000 (+0000)
Subject: remove stack frame set up and restore instructions from redirector
X-Git-Tag: before.move.to.git~160
X-Git-Url: https://git.unchartedbackwaters.co.uk/w/?a=commitdiff_plain;h=5630eb60fbb352838e194ae37026f376cc3f5730;p=francis%2Flibjit.git

remove stack frame set up and restore instructions from redirector
---

diff --git a/ChangeLog b/ChangeLog
index d75a7d8..497d5e9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2007-01-26  Aleksey Demakov  <ademakov@gmail.com>
+
+	* jit/jit-apply-x86.c (_jit_create_redirector): redirector does not
+	use stack frame so remove frame set up and restore instructions.
+
 2007-01-23  Aleksey Demakov  <ademakov@gmail.com>
 
 	* jit/jit-internal.h, jit/jit-function.c: remove the closure_entry
diff --git a/jit/jit-apply-x86.c b/jit/jit-apply-x86.c
index ab87f7a..33548f7 100644
--- a/jit/jit-apply-x86.c
+++ b/jit/jit-apply-x86.c
@@ -170,10 +170,6 @@ void *_jit_create_redirector(unsigned char *buf, void *func,
 {
 	void *start = (void *)buf;
 
-	/* Set up a new stack frame */
-	x86_push_reg(buf, X86_EBP);
-	x86_mov_reg_reg(buf, X86_EBP, X86_ESP, 4);
-
 	/* Save the fastcall registers, if necessary */
 #if JIT_APPLY_X86_FASTCALL == 1
 	if(abi == (int)jit_abi_fastcall)
@@ -201,9 +197,6 @@ void *_jit_create_redirector(unsigned char *buf, void *func,
 	}
 #endif
 
-	/* Restore the value of EBP */
-	x86_pop_reg(buf, X86_EBP);
-
 	/* Jump to the function that the redirector indicated */
 	x86_jump_reg(buf, X86_EAX);
 
diff --git a/jit/jit-apply-x86.h b/jit/jit-apply-x86.h
index d03949b..677129f 100644
--- a/jit/jit-apply-x86.h
+++ b/jit/jit-apply-x86.h
@@ -346,7 +346,7 @@
  * The number of bytes that are needed for a redirector stub.
  * This includes any extra bytes that are needed for alignment.
  */
-#define	jit_redirector_size		32
+#define	jit_redirector_size		24
 
 /*
  * The number of bytes that are needed for a indirector stub.