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.mayd...@linaro.org>
---
This fixes the odd asymmetry of API that caused the bug fixed
in commit 7472e2efb...
---
target/arm/translate.c | 23 ++++++++++-------------
1 file changed, 10 insertions(+), 13 deletions(-)
diff --git a/target/arm/translate.c b/target/arm/translate.c
index f120932..89ee353 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -9771,9 +9771,8 @@ 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;
@@ -10985,16 +10984,16 @@ 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);
@@ -11120,9 +11119,10 @@ 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)
@@ -12245,10 +12245,7 @@ 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. */
--
2.7.4
