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Xtensa fixes for 2.2:

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- fix entry opcode register window checking and add unit test.
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Merge remote-tracking branch 'remotes/xtensa/tags/20141110-xtensa' into staging

Xtensa fixes for 2.2:
- fix entry opcode register window checking and add unit test.

# gpg: Signature made Mon 10 Nov 2014 15:01:47 GMT using RSA key ID F83FA044
# gpg: Good signature from "Max Filippov <max.filippov@cogentembedded.com>"
# gpg:                 aka "Max Filippov <jcmvbkbc@gmail.com>"

* remotes/xtensa/tags/20141110-xtensa:
  target-xtensa: add entry overflow test
  target-xtensa: add missing window check for entry

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2014-11-10 20:50:36 +00:00
commit 9df98352b7
3 changed files with 63 additions and 0 deletions
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6
target-xtensa/cpu.h
View File

@ -472,6 +472,12 @@ static inline xtensa_tlb_entry *xtensa_tlb_get_entry(CPUXtensaState *env,
env->itlb[wi] + ei;
}
static inline uint32_t xtensa_replicate_windowstart(CPUXtensaState *env)
{
return env->sregs[WINDOW_START] |
(env->sregs[WINDOW_START] << env->config->nareg / 4);
}
/* MMU modes definitions */
#define MMU_MODE0_SUFFIX _ring0
#define MMU_MODE1_SUFFIX _ring1

6
target-xtensa/op_helper.c
View File

@ -235,6 +235,12 @@ void HELPER(entry)(CPUXtensaState *env, uint32_t pc, uint32_t s, uint32_t imm)
pc, env->sregs[PS]);
HELPER(exception_cause)(env, pc, ILLEGAL_INSTRUCTION_CAUSE);
} else {
uint32_t windowstart = xtensa_replicate_windowstart(env) >>
(env->sregs[WINDOW_BASE] + 1);
if (windowstart & ((1 << callinc) - 1)) {
HELPER(window_check)(env, pc, callinc);
}
env->regs[(callinc << 2) | (s & 3)] = env->regs[s] - (imm << 3);
rotate_window(env, callinc);
env->sregs[WINDOW_START] |=

51
tests/tcg/xtensa/test_windowed.S
View File

@ -299,4 +299,55 @@ test entry
entry_test 12
test_end
.macro entry_overflow_test window, free, next_window
set_vector window_overflow_4, 0
set_vector window_overflow_8, 0
set_vector window_overflow_12, 0
set_vector window_overflow_\next_window, 10f
movi a2, \window
movi a2, \free
movi a2, \next_window
reset_window %(1 | ((1 | (1 << ((\next_window) / 4))) << ((\free) / 4)))
reset_ps
movi a2, 0x4000f | ((\window) << 14)
wsr a2, ps
isync
movi a3, 0x12345678
j 1f
.align 4
1:
entry a3, 0x5678
test_fail
.align 4
10:
rsr a2, epc1
movi a3, 1b
assert eq, a2, a3
movi a2, 2f
wsr a2, epc1
rsr a2, windowbase
movi a3, (\free) / 4
assert eq, a2, a3
rfwo
2:
.endm
.macro all_entry_overflow_tests
.irp window, 4, 8, 12
.irp next_window, 4, 8, 12
.irp free, 4, 8, 12
.if \free <= \window
entry_overflow_test \window, \free, \next_window
.endif
.endr
.endr
.endr
.endm
test entry_overflow
all_entry_overflow_tests
test_end
test_suite_end