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authorPeter Maydell <peter.maydell@linaro.org>2020-02-14 17:05:45 +0000
committerPeter Maydell <peter.maydell@linaro.org>2020-02-14 17:05:45 +0000
commit030d0944a85ddcc93bf8e3eb2a7a5d718bb941bd (patch)
treedbb0aae54df2ed6f9ad8ddc887236907048e73f5
parent336bad333000ca95b4c32a32bccd0b79f0a4b8cb (diff)
downloadqemu-arm-030d0944a85ddcc93bf8e3eb2a7a5d718bb941bd.tar.gz
target/arm: Add isar_feature_any_fp16 and document naming/usage conventions
Our current usage of the isar_feature feature tests almost always uses an _aa32_ test when the code path is known to be AArch32 specific and an _aa64_ test when the code path is known to be AArch64 specific. There is just one exception: in the vfp_set_fpscr helper we check aa64_fp16 to determine whether the FZ16 bit in the FP(S)CR exists, but this code is also used for AArch32. There are other places in future where we're likely to want a general "does this feature exist for either AArch32 or AArch64" check (typically where architecturally the feature exists for both CPU states if it exists at all, but the CPU might be AArch32-only or AArch64-only, and so only have one set of ID registers). Introduce a new category of isar_feature_* functions: isar_feature_any_foo() should be tested when what we want to know is "does this feature exist for either AArch32 or AArch64", and always returns the logical OR of isar_feature_aa32_foo() and isar_feature_aa64_foo(). Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
-rw-r--r--target/arm/cpu.h19
-rw-r--r--target/arm/vfp_helper.c2
2 files changed, 19 insertions, 2 deletions
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 37d40e5790..7ccd65bdce 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -3328,7 +3328,16 @@ extern const uint64_t pred_esz_masks[4];
* Naming convention for isar_feature functions:
* Functions which test 32-bit ID registers should have _aa32_ in
* their name. Functions which test 64-bit ID registers should have
- * _aa64_ in their name.
+ * _aa64_ in their name. These must only be used in code where we
+ * know for certain that the CPU has AArch32 or AArch64 respectively
+ * or where the correct answer for a CPU which doesn't implement that
+ * CPU state is "false" (eg when generating A32 or A64 code, if adding
+ * system registers that are specific to that CPU state, for "should
+ * we let this system register bit be set" tests where the 32-bit
+ * flavour of the register doesn't have the bit, and so on).
+ * Functions which simply ask "does this feature exist at all" have
+ * _any_ in their name, and always return the logical OR of the _aa64_
+ * and the _aa32_ function.
*/
/*
@@ -3661,6 +3670,14 @@ static inline bool isar_feature_aa64_bti(const ARMISARegisters *id)
}
/*
+ * Feature tests for "does this exist in either 32-bit or 64-bit?"
+ */
+static inline bool isar_feature_any_fp16(const ARMISARegisters *id)
+{
+ return isar_feature_aa64_fp16(id) || isar_feature_aa32_fp16_arith(id);
+}
+
+/*
* Forward to the above feature tests given an ARMCPU pointer.
*/
#define cpu_isar_feature(name, cpu) \
diff --git a/target/arm/vfp_helper.c b/target/arm/vfp_helper.c
index 0ae7d4f34a..930d6e747f 100644
--- a/target/arm/vfp_helper.c
+++ b/target/arm/vfp_helper.c
@@ -185,7 +185,7 @@ uint32_t vfp_get_fpscr(CPUARMState *env)
void HELPER(vfp_set_fpscr)(CPUARMState *env, uint32_t val)
{
/* When ARMv8.2-FP16 is not supported, FZ16 is RES0. */
- if (!cpu_isar_feature(aa64_fp16, env_archcpu(env))) {
+ if (!cpu_isar_feature(any_fp16, env_archcpu(env))) {
val &= ~FPCR_FZ16;
}