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score/aarch64: Align context validation frame

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Ensure the stack remains aligned by keeping the context frame at a
multiple of 16 bytes. This avoids stack alignment exceptions which occur
when the stack pointer is not 16 byte aligned.
This commit is contained in:
Kinsey Moore
2021-03-12 09:57:59 -06:00
committed by Joel Sherrill
parent de694b753c
commit 342fe19842
1 changed files with 17 additions and 10 deletions
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27
cpukit/score/cpu/aarch64/aarch64-context-validate.S
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@@ -42,7 +42,9 @@
#include <rtems/asm.h> #include <rtems/asm.h>
#include <rtems/score/cpu.h> #include <rtems/score/cpu.h>
#include <rtems/score/basedefs.h>
/* These must be 8 byte aligned to avoid misaligned accesses */
#define FRAME_OFFSET_X4 0x00 #define FRAME_OFFSET_X4 0x00
#define FRAME_OFFSET_X5 0x08 #define FRAME_OFFSET_X5 0x08
#define FRAME_OFFSET_X6 0x10 #define FRAME_OFFSET_X6 0x10
@@ -54,18 +56,23 @@
#define FRAME_OFFSET_LR 0x40 #define FRAME_OFFSET_LR 0x40
#ifdef AARCH64_MULTILIB_VFP #ifdef AARCH64_MULTILIB_VFP
#define FRAME_OFFSET_V8 0x48 /* These must be 16 byte aligned to avoid misaligned accesses */
#define FRAME_OFFSET_V9 0x58 #define FRAME_OFFSET_V8 0x50
#define FRAME_OFFSET_V10 0x68 #define FRAME_OFFSET_V9 0x60
#define FRAME_OFFSET_V11 0x78 #define FRAME_OFFSET_V10 0x70
#define FRAME_OFFSET_V12 0x88 #define FRAME_OFFSET_V11 0x80
#define FRAME_OFFSET_V13 0x98 #define FRAME_OFFSET_V12 0x90
#define FRAME_OFFSET_V14 0xA8 #define FRAME_OFFSET_V13 0xA0
#define FRAME_OFFSET_V15 0xB8 #define FRAME_OFFSET_V14 0xB0
#define FRAME_OFFSET_V15 0xC0
#define FRAME_SIZE (FRAME_OFFSET_V15 + 0x10) /*
* Force 16 byte alignment of the frame size to avoid stack pointer alignment
* exceptions.
*/
#define FRAME_SIZE RTEMS_ALIGN_UP( FRAME_OFFSET_V15, 16 )
#else #else
#define FRAME_SIZE (FRAME_OFFSET_LR + 0x08) #define FRAME_SIZE RTEMS_ALIGN_UP( FRAME_OFFSET_LR, 16 )
#endif #endif
.section .text .section .text