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Correct the alignment of sp through functions that use UNWINDSVCFRAME. We

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were incorrectly adding the trap frame padding to the stack pointer after
reading it's value and unaligning it.
This commit is contained in:
Andrew Turner 2014-01-24 20:51:56 +00:00
parent 99984d229c
commit af3088290b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=261137
1 changed files with 6 additions and 1 deletions
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7
sys/arm/include/asmacros.h
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@ -216,8 +216,13 @@
ldmia sp, {sp, lr, pc}^ /* Restore lr and exit */
#endif
#if defined(__ARM_EABI__)
/*
* Unwind hints so we can unwind past functions that use
* PULLFRAMEFROMSVCANDEXIT. They are run in reverse order.
* As the last thing we do is restore the stack pointer
* we can ignore the padding at the end of struct trapframe.
*/
#define UNWINDSVCFRAME \
.pad #(4); /* Skip stack alignment */ \
.save {r13-r15}; /* Restore sp, lr, pc */ \
.pad #(2*4); /* Skip user sp and lr */ \
.save {r0-r12}; /* Restore r0-r12 */ \