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| author | Richard Henderson <richard.henderson@linaro.org> | 2022-04-21 08:17:23 -0700 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2022-04-26 08:17:05 -0700 |
| commit | 410c6aaa3b44d5bdd1af7c1a465be7d5df2dfbf0 (patch) | |
| tree | 6f4a563e7065afdbc39113f9af2d109466c582fa /linux-user/nios2 | |
| parent | 0e6f22c561a5e9e02dcfa535c4573b0344d4b2ba (diff) | |
| download | qemu-410c6aaa3b44d5bdd1af7c1a465be7d5df2dfbf0.zip qemu-410c6aaa3b44d5bdd1af7c1a465be7d5df2dfbf0.tar.gz qemu-410c6aaa3b44d5bdd1af7c1a465be7d5df2dfbf0.tar.bz2 | |
target/nios2: Implement Misaligned destination exception
Indirect branches, plus eret and bret optionally raise
an exception when branching to a misaligned address.
The exception is required when an mmu is enabled, but
enable it always because the fallback behaviour is not
documented (though presumably it discards low bits).
For the purposes of the linux-user cpu loop, if EXCP_UNALIGN
(misaligned data) were to arrive, it would be treated the
same as EXCP_UNALIGND (misaligned destination). See the
!defined(CONFIG_NIOS2_ALIGNMENT_TRAP) block in kernel/traps.c.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220421151735.31996-53-richard.henderson@linaro.org>
Diffstat (limited to 'linux-user/nios2')
| -rw-r--r-- | linux-user/nios2/cpu_loop.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/linux-user/nios2/cpu_loop.c b/linux-user/nios2/cpu_loop.c index 11ecb71..30a27f2 100644 --- a/linux-user/nios2/cpu_loop.c +++ b/linux-user/nios2/cpu_loop.c @@ -42,6 +42,12 @@ void cpu_loop(CPUNios2State *env) force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, env->pc); break; + case EXCP_UNALIGN: + case EXCP_UNALIGND: + force_sig_fault(TARGET_SIGBUS, TARGET_BUS_ADRALN, + env->ctrl[CR_BADADDR]); + break; + case EXCP_TRAP: /* * TODO: This advance should be done in the translator, as |