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arm: Validate IT[7:0] bit field of PSR

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Close #3093.
This commit is contained in:
Sebastian Huber
2017-08-10 07:51:17 +02:00
parent 5cc276e7c1
commit 7d097c5c69
1 changed files with 29 additions and 1 deletions
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30
cpukit/score/cpu/arm/arm-context-validate.S
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@@ -44,9 +44,14 @@
#define FRAME_SIZE (FRAME_OFFSET_LR + 4)
#endif
.syntax unified
.section .text
#ifdef __thumb2__
FUNCTION_THUMB_ENTRY(_CPU_Context_validate)
#else
FUNCTION_ENTRY(_CPU_Context_validate)
#endif
/* Save */
@@ -170,11 +175,34 @@ check:
bne restore
.endm
cmp r2, sp
/* A compare involving the stack pointer is deprecated */
mov r1, sp
cmp r2, r1
bne restore
mov r1, r0
#ifdef __thumb2__
cmp r1, r1
itttt eq
addeq r1, #1
addeq r1, #2
addeq r1, #4
addeq r1, #8
subs r1, #15
cmp r1, r0
bne restore
cmp r1, r1
iteee eq
addeq r1, #1
addne r1, #2
addne r1, #4
addne r1, #8
subs r1, #1
cmp r1, r0
bne restore
#endif
#ifndef ARM_MULTILIB_VFP
check_register r3
#endif