Author: andrew
Date: Sun Apr 8 04:36:27 2012
New Revision: 234014
URL: http://svn.freebsd.org/changeset/base/234014
Log:
Unlike other functions __aeabi_read_tp function must preserve r1-r3. The
currently generated code clobbers r3. Fix this by loading ARM_TP_ADDRESS
using inline assembly.
Approved by: imp (mentor)
Modified:
head/lib/libc/arm/gen/__aeabi_read_tp.c
Modified: head/lib/libc/arm/gen/__aeabi_read_tp.c
==============================================================================
--- head/lib/libc/arm/gen/__aeabi_read_tp.c Sun Apr 8 04:22:09 2012
(r234013)
+++ head/lib/libc/arm/gen/__aeabi_read_tp.c Sun Apr 8 04:36:27 2012
(r234014)
@@ -1,5 +1,6 @@
/*-
* Copyright (c) 2012 Oleksandr Tymoshenko
+ * Copyright (c) 2012 Andrew Turner
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -36,7 +37,9 @@ __FBSDID("$FreeBSD$");
void *
__aeabi_read_tp()
{
- void **_tp = (void **)ARM_TP_ADDRESS;
+ void *_tp;
- return (*_tp);
+ asm("ldr %0, [%1]\n" : "=r"(_tp) : "r"(ARM_TP_ADDRESS));
+
+ return _tp;
}
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