From d8087c1e6a27182970465b434243938556888629 Mon Sep 17 00:00:00 2001
From: Nelson Elhage <nelhage@ksplice.com>
Date: Mon, 8 Nov 2010 22:28:06 -0500
Subject: [PATCH] Make bt_translate_and_run use regparm(3).

---
 bt.cpp      |  2 +-
 bt_helper.S | 17 +++++++++--------
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/bt.cpp b/bt.cpp
index 2ecc811..45565df 100644
--- a/bt.cpp
+++ b/bt.cpp
@@ -44,7 +44,7 @@ extern "C" void bt_continue_chain(void);
 extern "C" void bt_continue_ic(void);
 extern "C" void bt_interrupt(void);
 
-extern "C" void bt_translate_and_run(beta_cpu *cpu, uint32_t used, ccbuff chainptr) __attribute__((noreturn, used));
+extern "C" void bt_translate_and_run(beta_cpu *cpu, uint32_t used, ccbuff chainptr) __attribute__((noreturn, used, regparm(3)));
 static ccbuff bt_translate_frag(compiled_frag *cfrag, decode_frag *frag);
 
 /*
diff --git a/bt_helper.S b/bt_helper.S
index 847e8bf..ce04d1b 100644
--- a/bt_helper.S
+++ b/bt_helper.S
@@ -17,10 +17,9 @@ _(bt_interrupt):
         mov _(bt_stack_base), %esp
         movl %ebp, %eax
         call _(bt_process_interrupt)
-        subl $4, %esp
-        pushl $0
-        pushl $0
-        pushl %ebp
+        xorl %edx, %edx
+        xorl %ecx, %ecx
+        movl %ebp, %eax
         call _(bt_translate_and_run)
 
 _(bt_continue):
@@ -44,14 +43,16 @@ miss:
         pushl $0
 _(bt_continue_chain):
         mov %eax, 128(%ebp)
-        pushl $1
-        pushl %ebp
+        popl %ecx
+        movl $1, %edx
+        movl %ebp, %eax
         call _(bt_translate_and_run)
 
 _(bt_continue_ic):
         mov %eax, 128(%ebp)
-        pushl $0
-        pushl %ebp
+        popl %ecx
+        xorl %edx, %edx
+        movl %ebp, %eax
         call _(bt_translate_and_run)
 
 _(bt_enter):