diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2018-01-11 13:25:40 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2018-01-11 13:25:40 +0000 |
| commit | 2eea841c11096e8dcc457b80e21f3fbdc32d2590 (patch) | |
| tree | af49f07b579828654f824fd26eda04ca0b746310 /target | |
| parent | 579648554acbd6c22d5cc2f03cf77cfc25332650 (diff) | |
target/arm: Make disas_thumb2_insn() generate its own UNDEF exceptions
Refactor disas_thumb2_insn() so that it generates the code for raising
an UNDEF exception for invalid insns, rather than returning a flag
which the caller must check to see if it needs to generate the UNDEF
code. This brings the function in to line with the behaviour of
disas_thumb_insn() and disas_arm_insn().
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 1513080506-17703-1-git-send-email-peter.maydell@linaro.org
Diffstat (limited to 'target')
| -rw-r--r-- | target/arm/translate.c | 23 |
1 files changed, 10 insertions, 13 deletions
diff --git a/target/arm/translate.c b/target/arm/translate.c index c690658493..781be1e219 100644 --- a/target/arm/translate.c +++ b/target/arm/translate.c @@ -9775,9 +9775,8 @@ gen_thumb2_data_op(DisasContext *s, int op, int conds, uint32_t shifter_out, return 0; } -/* Translate a 32-bit thumb instruction. Returns nonzero if the instruction - is not legal. */ -static int disas_thumb2_insn(DisasContext *s, uint32_t insn) +/* Translate a 32-bit thumb instruction. */ +static void disas_thumb2_insn(DisasContext *s, uint32_t insn) { uint32_t imm, shift, offset; uint32_t rd, rn, rm, rs; @@ -11016,16 +11015,16 @@ static int disas_thumb2_insn(DisasContext *s, uint32_t insn) /* UNPREDICTABLE, unallocated hint or * PLD/PLDW/PLI (literal) */ - return 0; + return; } if (op1 & 1) { - return 0; /* PLD/PLDW/PLI or unallocated hint */ + return; /* PLD/PLDW/PLI or unallocated hint */ } if ((op2 == 0) || ((op2 & 0x3c) == 0x30)) { - return 0; /* PLD/PLDW/PLI or unallocated hint */ + return; /* PLD/PLDW/PLI or unallocated hint */ } /* UNDEF space, or an UNPREDICTABLE */ - return 1; + goto illegal_op; } } memidx = get_mem_index(s); @@ -11151,9 +11150,10 @@ static int disas_thumb2_insn(DisasContext *s, uint32_t insn) default: goto illegal_op; } - return 0; + return; illegal_op: - return 1; + gen_exception_insn(s, 4, EXCP_UDEF, syn_uncategorized(), + default_exception_el(s)); } static void disas_thumb_insn(DisasContext *s, uint32_t insn) @@ -12275,10 +12275,7 @@ static void thumb_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu) if (is_16bit) { disas_thumb_insn(dc, insn); } else { - if (disas_thumb2_insn(dc, insn)) { - gen_exception_insn(dc, 4, EXCP_UDEF, syn_uncategorized(), - default_exception_el(dc)); - } + disas_thumb2_insn(dc, insn); } /* Advance the Thumb condexec condition. */ |