The unaligned local in __aeabi_uidivmod leads to a store to a 64bit
value at an address that is not divisible by 8 (in grub_divmod64).
The compiler most likely generates a STRD instruction to store it and
this causes an exception.
Fixes Savannah bug #43632.
This includes improvements done by Leif Lindholm.
+2014-12-07 David Kozub <zub.272@gmail.com>
+
+ * grub-core/kern/arm/misc.S: fix unaligned 64bit local variable
+ in __aeabi_uidivmod
+ Fixes Savannah bug #43632.
+
2014-12-07 Peter Nelson <peterdn>
* grub-core/fs/ext2.c (grub_ext2_read_block): Support large sparse
.macro division parent
- stmfd sp!, {lr}
- sub sp, sp, #12
+ sub sp, sp, #8 @ Allocate naturally aligned 64-bit space
+ stmfd sp!, {r3,lr} @ Dummy r3 to maintain stack alignment
+ add r3, sp, #8 @ Set r3 to address of 64-bit space
+ str r3, [sp] @ Stack parameter, pointer to 64-bit space
mov r2, r1
- add r1, sp, #4
- str r1, [sp, #0]
mov r1, #0
mov r3, #0
bl \parent
- ldr r1, [sp, #4]
- add sp, sp, #12
- ldmfd sp!, {lr}
+ ldr r1, [sp, #8] @ Extract remainder
+ ldmfd sp!, {r3,lr} @ Pop into an unused arg/scratch register
+ add sp, sp, #8
bx lr
.endm