Context validation for AArch64 was ported from the ARM implementation
without a reinterpretation of the actual requirements. The spcontext01
test just happened to pass because the set of scratch registers in ARM
is a subset of the scratch registers in AArch64.
---
.../cpu/aarch64/aarch64-context-validate.S | 159 ++++++++++++------
.../aarch64-context-volatile-clobber.S | 19 +++
2 files changed, 123 insertions(+), 55 deletions(-)
diff --git a/cpukit/score/cpu/aarch64/aarch64-context-validate.S
b/cpukit/score/cpu/aarch64/aarch64-context-validate.S
index 1e71bc5b3a..1daa0d6bf2 100644
--- a/cpukit/score/cpu/aarch64/aarch64-context-validate.S
+++ b/cpukit/score/cpu/aarch64/aarch64-context-validate.S
@@ -44,35 +44,47 @@
#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_X5 0x08
-#define FRAME_OFFSET_X6 0x10
-#define FRAME_OFFSET_X7 0x18
-#define FRAME_OFFSET_X8 0x20
-#define FRAME_OFFSET_X9 0x28
-#define FRAME_OFFSET_X10 0x30
-#define FRAME_OFFSET_X11 0x38
-#define FRAME_OFFSET_LR 0x40
+/*
+ * This register size applies to X (integer) registers as well as the D (lower
+ * half floating point) registers. It does not apply to V (full size floating
+ * point) registers or W (lower half integer) registers.
+ */
+#define AARCH64_REGISTER_SIZE 8
+
+/* According to the AAPCS64, X19-X28 are callee-saved registers */
+#define FRAME_OFFSET_X19 0x00
+#define FRAME_OFFSET_X20 0x08
+#define FRAME_OFFSET_X21 0x10
+#define FRAME_OFFSET_X22 0x18
+#define FRAME_OFFSET_X23 0x20
+#define FRAME_OFFSET_X24 0x28
+#define FRAME_OFFSET_X25 0x30
+#define FRAME_OFFSET_X26 0x38
+#define FRAME_OFFSET_X27 0x40
+#define FRAME_OFFSET_X28 0x48
+#define FRAME_OFFSET_LR 0x50
#ifdef AARCH64_MULTILIB_VFP
- /* These must be 16 byte aligned to avoid misaligned accesses */
- #define FRAME_OFFSET_V8 0x50
- #define FRAME_OFFSET_V9 0x60
- #define FRAME_OFFSET_V10 0x70
- #define FRAME_OFFSET_V11 0x80
- #define FRAME_OFFSET_V12 0x90
- #define FRAME_OFFSET_V13 0xA0
- #define FRAME_OFFSET_V14 0xB0
- #define FRAME_OFFSET_V15 0xC0
+ /*
+ * According to the AAPCS64, V8-V15 are callee-saved registers, but only the
+ * bottom 8 bytes are required to be saved which correspond to D8-D15.
+ */
+ #define FRAME_OFFSET_D8 0x58
+ #define FRAME_OFFSET_D9 0x60
+ #define FRAME_OFFSET_D10 0x68
+ #define FRAME_OFFSET_D11 0x70
+ #define FRAME_OFFSET_D12 0x78
+ #define FRAME_OFFSET_D13 0x80
+ #define FRAME_OFFSET_D14 0x88
+ #define FRAME_OFFSET_D15 0x90
/*
* Force 16 byte alignment of the frame size to avoid stack pointer alignment
* exceptions.
*/
- #define FRAME_SIZE RTEMS_ALIGN_UP( FRAME_OFFSET_V15, 16 )
+ #define FRAME_SIZE RTEMS_ALIGN_UP( FRAME_OFFSET_D15 + AARCH64_REGISTER_SIZE,
16 )
#else
- #define FRAME_SIZE RTEMS_ALIGN_UP( FRAME_OFFSET_LR, 16 )
+ #define FRAME_SIZE RTEMS_ALIGN_UP( FRAME_OFFSET_LR + AARCH64_REGISTER_SIZE,
16 )
#endif
.section .text
@@ -83,25 +95,27 @@ FUNCTION_ENTRY(_CPU_Context_validate)
sub sp, sp, #FRAME_SIZE
- str x4, [sp, #FRAME_OFFSET_X4]
- str x5, [sp, #FRAME_OFFSET_X5]
- str x6, [sp, #FRAME_OFFSET_X6]
- str x7, [sp, #FRAME_OFFSET_X7]
- str x8, [sp, #FRAME_OFFSET_X8]
- str x9, [sp, #FRAME_OFFSET_X9]
- str x10, [sp, #FRAME_OFFSET_X10]
- str x11, [sp, #FRAME_OFFSET_X11]
+ str x19, [sp, #FRAME_OFFSET_X19]
+ str x20, [sp, #FRAME_OFFSET_X20]
+ str x21, [sp, #FRAME_OFFSET_X21]
+ str x22, [sp, #FRAME_OFFSET_X22]
+ str x23, [sp, #FRAME_OFFSET_X23]
+ str x24, [sp, #FRAME_OFFSET_X24]
+ str x25, [sp, #FRAME_OFFSET_X25]
+ str x26, [sp, #FRAME_OFFSET_X26]
+ str x27, [sp, #FRAME_OFFSET_X27]
+ str x28, [sp, #FRAME_OFFSET_X28]
str lr, [sp, #FRAME_OFFSET_LR]
#ifdef AARCH64_MULTILIB_VFP
- str d8, [sp, #FRAME_OFFSET_V8]
- str d9, [sp, #FRAME_OFFSET_V9]
- str d10, [sp, #FRAME_OFFSET_V10]
- str d11, [sp, #FRAME_OFFSET_V11]
- str d12, [sp, #FRAME_OFFSET_V12]
- str d13, [sp, #FRAME_OFFSET_V13]
- str d14, [sp, #FRAME_OFFSET_V14]
- str d15, [sp, #FRAME_OFFSET_V15]
+ str d8, [sp, #FRAME_OFFSET_D8]
+ str d9, [sp, #FRAME_OFFSET_D9]
+ str d10, [sp, #FRAME_OFFSET_D10]
+ str d11, [sp, #FRAME_OFFSET_D11]
+ str d12, [sp, #FRAME_OFFSET_D12]
+ str d13, [sp, #FRAME_OFFSET_D13]
+ str d14, [sp, #FRAME_OFFSET_D14]
+ str d15, [sp, #FRAME_OFFSET_D15]
#endif
/* Fill */
@@ -119,7 +133,7 @@ FUNCTION_ENTRY(_CPU_Context_validate)
#ifdef AARCH64_MULTILIB_VFP
- /* X3 contains the FPSCR */
+ /* X3 contains the FPSR */
mrs x3, FPSR
ldr x4, =0xf000001f
bic x3, x3, x4
@@ -139,6 +153,23 @@ FUNCTION_ENTRY(_CPU_Context_validate)
fill_register x10
fill_register x11
fill_register x12
+ fill_register x13
+ fill_register x14
+ fill_register x15
+ fill_register x16
+ fill_register x17
+ fill_register x18
+ fill_register x19
+ fill_register x20
+ fill_register x21
+ fill_register x22
+ fill_register x23
+ fill_register x24
+ fill_register x25
+ fill_register x26
+ fill_register x27
+ fill_register x28
+ fill_register x29
fill_register lr
#ifdef AARCH64_MULTILIB_VFP
@@ -191,7 +222,6 @@ check:
bne restore
.endm
- /* A compare involving the stack pointer is deprecated */
mov x1, sp
cmp x2, x1
bne restore
@@ -211,6 +241,23 @@ check:
check_register x10
check_register x11
check_register x12
+ check_register x13
+ check_register x14
+ check_register x15
+ check_register x16
+ check_register x17
+ check_register x18
+ check_register x19
+ check_register x20
+ check_register x21
+ check_register x22
+ check_register x23
+ check_register x24
+ check_register x25
+ check_register x26
+ check_register x27
+ check_register x28
+ check_register x29
check_register lr
#ifdef AARCH64_MULTILIB_VFP
@@ -222,25 +269,27 @@ check:
/* Restore */
restore:
- ldr x4, [sp, #FRAME_OFFSET_X4]
- ldr x5, [sp, #FRAME_OFFSET_X5]
- ldr x6, [sp, #FRAME_OFFSET_X6]
- ldr x7, [sp, #FRAME_OFFSET_X7]
- ldr x8, [sp, #FRAME_OFFSET_X8]
- ldr x9, [sp, #FRAME_OFFSET_X9]
- ldr x10, [sp, #FRAME_OFFSET_X10]
- ldr x11, [sp, #FRAME_OFFSET_X11]
+ ldr x19, [sp, #FRAME_OFFSET_X19]
+ ldr x20, [sp, #FRAME_OFFSET_X20]
+ ldr x21, [sp, #FRAME_OFFSET_X21]
+ ldr x22, [sp, #FRAME_OFFSET_X22]
+ ldr x23, [sp, #FRAME_OFFSET_X23]
+ ldr x24, [sp, #FRAME_OFFSET_X24]
+ ldr x25, [sp, #FRAME_OFFSET_X25]
+ ldr x26, [sp, #FRAME_OFFSET_X26]
+ ldr x27, [sp, #FRAME_OFFSET_X27]
+ ldr x28, [sp, #FRAME_OFFSET_X28]
ldr lr, [sp, #FRAME_OFFSET_LR]
#ifdef AARCH64_MULTILIB_VFP
- ldr d8, [sp, #FRAME_OFFSET_V8]
- ldr d9, [sp, #FRAME_OFFSET_V9]
- ldr d10, [sp, #FRAME_OFFSET_V10]
- ldr d11, [sp, #FRAME_OFFSET_V11]
- ldr d12, [sp, #FRAME_OFFSET_V12]
- ldr d13, [sp, #FRAME_OFFSET_V13]
- ldr d14, [sp, #FRAME_OFFSET_V14]
- ldr d15, [sp, #FRAME_OFFSET_V15]
+ ldr d8, [sp, #FRAME_OFFSET_D8]
+ ldr d9, [sp, #FRAME_OFFSET_D9]
+ ldr d10, [sp, #FRAME_OFFSET_D10]
+ ldr d11, [sp, #FRAME_OFFSET_D11]
+ ldr d12, [sp, #FRAME_OFFSET_D12]
+ ldr d13, [sp, #FRAME_OFFSET_D13]
+ ldr d14, [sp, #FRAME_OFFSET_D14]
+ ldr d15, [sp, #FRAME_OFFSET_D15]
#endif
add sp, sp, #FRAME_SIZE
diff --git a/cpukit/score/cpu/aarch64/aarch64-context-volatile-clobber.S
b/cpukit/score/cpu/aarch64/aarch64-context-volatile-clobber.S
index 2be5ce69ff..73472b81ac 100644
--- a/cpukit/score/cpu/aarch64/aarch64-context-volatile-clobber.S
+++ b/cpukit/score/cpu/aarch64/aarch64-context-volatile-clobber.S
@@ -90,10 +90,29 @@ FUNCTION_ENTRY(_CPU_Context_volatile_clobber)
clobber_vfp_register d31
#endif /* AARCH64_MULTILIB_VFP */
+/*
+ * According to the AAPCS64, X0-X18 and X29 are caller-saved registers. X0 is
+ * already being clobbered.
+ */
clobber_register x1
clobber_register x2
clobber_register x3
+ clobber_register x4
+ clobber_register x5
+ clobber_register x6
+ clobber_register x7
+ clobber_register x8
+ clobber_register x9
+ clobber_register x10
+ clobber_register x11
clobber_register x12
+ clobber_register x13
+ clobber_register x14
+ clobber_register x15
+ clobber_register x16
+ clobber_register x17
+ clobber_register x18
+ clobber_register x29
ret
--
2.30.2
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