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xtensa: allow single-stepping through unaligned load/store

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Update icount when icountlevel is non-zero but not greater than EXCM level
when load/store instruction is successfully emulated. This allows
single-stepping over such instruction in userspace debugger.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2014-08-04 05:55:53 +04:00
parent 21570465a3
commit a83b02e9bd
1 changed files with 8 additions and 0 deletions
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8
arch/xtensa/kernel/align.S
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@ -421,6 +421,14 @@ ENTRY(fast_unaligned)
1: wsr a7, epc1 # skip emulated instruction
/* Update icount if we're single-stepping in userspace. */
rsr a4, icountlevel
beqz a4, 1f
bgeui a4, LOCKLEVEL + 1, 1f
rsr a4, icount
addi a4, a4, 1
wsr a4, icount
1:
movi a4, 0
rsr a3, excsave1
s32i a4, a3, EXC_TABLE_FIXUP