diff options
Diffstat (limited to 'cpukit/score/cpu/arm/__aeabi_read_tp.c')
-rw-r--r-- | cpukit/score/cpu/arm/__aeabi_read_tp.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/cpukit/score/cpu/arm/__aeabi_read_tp.c b/cpukit/score/cpu/arm/__aeabi_read_tp.c new file mode 100644 index 0000000000..afdfd99d8b --- /dev/null +++ b/cpukit/score/cpu/arm/__aeabi_read_tp.c @@ -0,0 +1,44 @@ +/* + * Copyright (c) 2014 embedded brains GmbH. All rights reserved. + * + * embedded brains GmbH + * Obere Lagerstr. 30 + * 82178 Puchheim + * Germany + * <rtems@embedded-brains.de> + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.com/license/LICENSE. + */ + +#ifdef HAVE_CONFIG_H + #include "config.h" +#endif + +#include <rtems/score/thread.h> +#include <rtems/score/percpu.h> + +#ifndef RTEMS_SMP + +void __attribute__((naked)) __aeabi_read_tp(void); + +void __attribute__((naked)) __aeabi_read_tp(void) +{ + __asm__ volatile ( + "ldr r0, =_Per_CPU_Information\n" + "ldr r0, [r0, %[executingoff]]\n" +#if defined(__thumb__) && !defined(__thumb2__) + "add r0, %[tlsareaoff]\n" + "ldr r0, [r0]\n" +#else + "ldr r0, [r0, %[tlsareaoff]]\n" +#endif + "bx lr\n" + : + : [executingoff] "I" (offsetof(Per_CPU_Control, executing)), + [tlsareaoff] "I" (offsetof(Thread_Control, Start.tls_area)) + ); +} + +#endif /* RTEMS_SMP */ |