xen/include/asm-arm/asm_defns.h | 8 +++- xen/include/asm-arm/smccc.h | 74 ++++++++++++++++----------------- 2 files changed, 44 insertions(+), 38 deletions(-)
Clang 8.0 (see [1]) and by extent some of the version of armclang does
not support register allocation using the syntax rN.
Thankfully, both GCC [2] and clang are able to support the xN syntax for
Arm64. Introduce a new macro ASM_REG() and use in common code for
register allocation.
[1] https://reviews.llvm.org/rL328829
[2] https://gcc.gnu.org/onlinedocs/gcc/Machine-Constraints.html
Cc: Andrii Anisov <andrii_anisov@epam.com>
Signed-off-by: Julien Grall <julien@xen.org>
---
xen/include/asm-arm/asm_defns.h | 8 +++-
xen/include/asm-arm/smccc.h | 74 ++++++++++++++++-----------------
2 files changed, 44 insertions(+), 38 deletions(-)
diff --git a/xen/include/asm-arm/asm_defns.h b/xen/include/asm-arm/asm_defns.h
index b4fbcdae1d..29a9dbb002 100644
--- a/xen/include/asm-arm/asm_defns.h
+++ b/xen/include/asm-arm/asm_defns.h
@@ -7,11 +7,17 @@
#endif
#include <asm/processor.h>
-/* For generic assembly code: use macros to define operand sizes. */
+/* Macros for generic assembly code */
#if defined(CONFIG_ARM_32)
# define __OP32
+# define ASM_REG(index) asm("r" # index)
#elif defined(CONFIG_ARM_64)
# define __OP32 "w"
+/*
+ * Clang < 8.0 doesn't support register alllocation using the syntax rN.
+ * See https://reviews.llvm.org/rL328829.
+ */
+# define ASM_REG(index) asm("x" # index)
#else
# error "unknown ARM variant"
#endif
diff --git a/xen/include/asm-arm/smccc.h b/xen/include/asm-arm/smccc.h
index 126399dd70..9d94beb3df 100644
--- a/xen/include/asm-arm/smccc.h
+++ b/xen/include/asm-arm/smccc.h
@@ -120,59 +120,59 @@ struct arm_smccc_res {
#define __constraint_read_6 __constraint_read_5, "r" (r6)
#define __constraint_read_7 __constraint_read_6, "r" (r7)
-#define __declare_arg_0(a0, res) \
- struct arm_smccc_res *___res = res; \
- register unsigned long r0 asm("r0") = (uint32_t)a0;\
- register unsigned long r1 asm("r1"); \
- register unsigned long r2 asm("r2"); \
- register unsigned long r3 asm("r3")
-
-#define __declare_arg_1(a0, a1, res) \
- typeof(a1) __a1 = a1; \
- struct arm_smccc_res *___res = res; \
- register unsigned long r0 asm("r0") = (uint32_t)a0;\
- register unsigned long r1 asm("r1") = __a1; \
- register unsigned long r2 asm("r2"); \
- register unsigned long r3 asm("r3")
-
-#define __declare_arg_2(a0, a1, a2, res) \
- typeof(a1) __a1 = a1; \
- typeof(a2) __a2 = a2; \
- struct arm_smccc_res *___res = res; \
- register unsigned long r0 asm("r0") = (uint32_t)a0;\
- register unsigned long r1 asm("r1") = __a1; \
- register unsigned long r2 asm("r2") = __a2; \
- register unsigned long r3 asm("r3")
-
-#define __declare_arg_3(a0, a1, a2, a3, res) \
- typeof(a1) __a1 = a1; \
- typeof(a2) __a2 = a2; \
- typeof(a3) __a3 = a3; \
- struct arm_smccc_res *___res = res; \
- register unsigned long r0 asm("r0") = (uint32_t)a0;\
- register unsigned long r1 asm("r1") = __a1; \
- register unsigned long r2 asm("r2") = __a2; \
- register unsigned long r3 asm("r3") = __a3
+#define __declare_arg_0(a0, res) \
+ struct arm_smccc_res *___res = res; \
+ register unsigned long r0 ASM_REG(0) = (uint32_t)a0; \
+ register unsigned long r1 ASM_REG(1); \
+ register unsigned long r2 ASM_REG(2); \
+ register unsigned long r3 ASM_REG(3)
+
+#define __declare_arg_1(a0, a1, res) \
+ typeof(a1) __a1 = a1; \
+ struct arm_smccc_res *___res = res; \
+ register unsigned long r0 ASM_REG(0) = (uint32_t)a0; \
+ register unsigned long r1 ASM_REG(1) = __a1; \
+ register unsigned long r2 ASM_REG(2); \
+ register unsigned long r3 ASM_REG(3)
+
+#define __declare_arg_2(a0, a1, a2, res) \
+ typeof(a1) __a1 = a1; \
+ typeof(a2) __a2 = a2; \
+ struct arm_smccc_res *___res = res; \
+ register unsigned long r0 ASM_REG(0) = (uint32_t)a0; \
+ register unsigned long r1 ASM_REG(1) = __a1; \
+ register unsigned long r2 ASM_REG(2) = __a2; \
+ register unsigned long r3 ASM_REG(3)
+
+#define __declare_arg_3(a0, a1, a2, a3, res) \
+ typeof(a1) __a1 = a1; \
+ typeof(a2) __a2 = a2; \
+ typeof(a3) __a3 = a3; \
+ struct arm_smccc_res *___res = res; \
+ register unsigned long r0 ASM_REG(0) = (uint32_t)a0; \
+ register unsigned long r1 ASM_REG(1) = __a1; \
+ register unsigned long r2 ASM_REG(2) = __a2; \
+ register unsigned long r3 ASM_REG(3) = __a3
#define __declare_arg_4(a0, a1, a2, a3, a4, res) \
typeof(a4) __a4 = a4; \
__declare_arg_3(a0, a1, a2, a3, res); \
- register unsigned long r4 asm("r4") = __a4
+ register unsigned long r4 ASM_REG(4) = __a4
#define __declare_arg_5(a0, a1, a2, a3, a4, a5, res) \
typeof(a5) __a5 = a5; \
__declare_arg_4(a0, a1, a2, a3, a4, res); \
- register typeof(a5) r5 asm("r5") = __a5
+ register typeof(a5) r5 ASM_REG(5) = __a5
#define __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res) \
typeof(a6) __a6 = a6; \
__declare_arg_5(a0, a1, a2, a3, a4, a5, res); \
- register typeof(a6) r6 asm("r6") = __a6
+ register typeof(a6) r6 ASM_REG(6) = __a6
#define __declare_arg_7(a0, a1, a2, a3, a4, a5, a6, a7, res) \
typeof(a7) __a7 = a7; \
__declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res); \
- register typeof(a7) r7 asm("r7") = __a7
+ register typeof(a7) r7 ASM_REG(7) = __a7
#define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__)
#define __declare_args(count, ...) ___declare_args(count, __VA_ARGS__)
--
2.17.1
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Hi, Ping? Cheers, On 17/02/2020 22:20, Julien Grall wrote: > Clang 8.0 (see [1]) and by extent some of the version of armclang does > not support register allocation using the syntax rN. > > Thankfully, both GCC [2] and clang are able to support the xN syntax for > Arm64. Introduce a new macro ASM_REG() and use in common code for > register allocation. > > [1] https://reviews.llvm.org/rL328829 > [2] https://gcc.gnu.org/onlinedocs/gcc/Machine-Constraints.html > > Cc: Andrii Anisov <andrii_anisov@epam.com> > Signed-off-by: Julien Grall <julien@xen.org> > --- > xen/include/asm-arm/asm_defns.h | 8 +++- > xen/include/asm-arm/smccc.h | 74 ++++++++++++++++----------------- > 2 files changed, 44 insertions(+), 38 deletions(-) > > diff --git a/xen/include/asm-arm/asm_defns.h b/xen/include/asm-arm/asm_defns.h > index b4fbcdae1d..29a9dbb002 100644 > --- a/xen/include/asm-arm/asm_defns.h > +++ b/xen/include/asm-arm/asm_defns.h > @@ -7,11 +7,17 @@ > #endif > #include <asm/processor.h> > > -/* For generic assembly code: use macros to define operand sizes. */ > +/* Macros for generic assembly code */ > #if defined(CONFIG_ARM_32) > # define __OP32 > +# define ASM_REG(index) asm("r" # index) > #elif defined(CONFIG_ARM_64) > # define __OP32 "w" > +/* > + * Clang < 8.0 doesn't support register alllocation using the syntax rN. > + * See https://reviews.llvm.org/rL328829. > + */ > +# define ASM_REG(index) asm("x" # index) > #else > # error "unknown ARM variant" > #endif > diff --git a/xen/include/asm-arm/smccc.h b/xen/include/asm-arm/smccc.h > index 126399dd70..9d94beb3df 100644 > --- a/xen/include/asm-arm/smccc.h > +++ b/xen/include/asm-arm/smccc.h > @@ -120,59 +120,59 @@ struct arm_smccc_res { > #define __constraint_read_6 __constraint_read_5, "r" (r6) > #define __constraint_read_7 __constraint_read_6, "r" (r7) > > -#define __declare_arg_0(a0, res) \ > - struct arm_smccc_res *___res = res; \ > - register unsigned long r0 asm("r0") = (uint32_t)a0;\ > - register unsigned long r1 asm("r1"); \ > - register unsigned long r2 asm("r2"); \ > - register unsigned long r3 asm("r3") > - > -#define __declare_arg_1(a0, a1, res) \ > - typeof(a1) __a1 = a1; \ > - struct arm_smccc_res *___res = res; \ > - register unsigned long r0 asm("r0") = (uint32_t)a0;\ > - register unsigned long r1 asm("r1") = __a1; \ > - register unsigned long r2 asm("r2"); \ > - register unsigned long r3 asm("r3") > - > -#define __declare_arg_2(a0, a1, a2, res) \ > - typeof(a1) __a1 = a1; \ > - typeof(a2) __a2 = a2; \ > - struct arm_smccc_res *___res = res; \ > - register unsigned long r0 asm("r0") = (uint32_t)a0;\ > - register unsigned long r1 asm("r1") = __a1; \ > - register unsigned long r2 asm("r2") = __a2; \ > - register unsigned long r3 asm("r3") > - > -#define __declare_arg_3(a0, a1, a2, a3, res) \ > - typeof(a1) __a1 = a1; \ > - typeof(a2) __a2 = a2; \ > - typeof(a3) __a3 = a3; \ > - struct arm_smccc_res *___res = res; \ > - register unsigned long r0 asm("r0") = (uint32_t)a0;\ > - register unsigned long r1 asm("r1") = __a1; \ > - register unsigned long r2 asm("r2") = __a2; \ > - register unsigned long r3 asm("r3") = __a3 > +#define __declare_arg_0(a0, res) \ > + struct arm_smccc_res *___res = res; \ > + register unsigned long r0 ASM_REG(0) = (uint32_t)a0; \ > + register unsigned long r1 ASM_REG(1); \ > + register unsigned long r2 ASM_REG(2); \ > + register unsigned long r3 ASM_REG(3) > + > +#define __declare_arg_1(a0, a1, res) \ > + typeof(a1) __a1 = a1; \ > + struct arm_smccc_res *___res = res; \ > + register unsigned long r0 ASM_REG(0) = (uint32_t)a0; \ > + register unsigned long r1 ASM_REG(1) = __a1; \ > + register unsigned long r2 ASM_REG(2); \ > + register unsigned long r3 ASM_REG(3) > + > +#define __declare_arg_2(a0, a1, a2, res) \ > + typeof(a1) __a1 = a1; \ > + typeof(a2) __a2 = a2; \ > + struct arm_smccc_res *___res = res; \ > + register unsigned long r0 ASM_REG(0) = (uint32_t)a0; \ > + register unsigned long r1 ASM_REG(1) = __a1; \ > + register unsigned long r2 ASM_REG(2) = __a2; \ > + register unsigned long r3 ASM_REG(3) > + > +#define __declare_arg_3(a0, a1, a2, a3, res) \ > + typeof(a1) __a1 = a1; \ > + typeof(a2) __a2 = a2; \ > + typeof(a3) __a3 = a3; \ > + struct arm_smccc_res *___res = res; \ > + register unsigned long r0 ASM_REG(0) = (uint32_t)a0; \ > + register unsigned long r1 ASM_REG(1) = __a1; \ > + register unsigned long r2 ASM_REG(2) = __a2; \ > + register unsigned long r3 ASM_REG(3) = __a3 > > #define __declare_arg_4(a0, a1, a2, a3, a4, res) \ > typeof(a4) __a4 = a4; \ > __declare_arg_3(a0, a1, a2, a3, res); \ > - register unsigned long r4 asm("r4") = __a4 > + register unsigned long r4 ASM_REG(4) = __a4 > > #define __declare_arg_5(a0, a1, a2, a3, a4, a5, res) \ > typeof(a5) __a5 = a5; \ > __declare_arg_4(a0, a1, a2, a3, a4, res); \ > - register typeof(a5) r5 asm("r5") = __a5 > + register typeof(a5) r5 ASM_REG(5) = __a5 > > #define __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res) \ > typeof(a6) __a6 = a6; \ > __declare_arg_5(a0, a1, a2, a3, a4, a5, res); \ > - register typeof(a6) r6 asm("r6") = __a6 > + register typeof(a6) r6 ASM_REG(6) = __a6 > > #define __declare_arg_7(a0, a1, a2, a3, a4, a5, a6, a7, res) \ > typeof(a7) __a7 = a7; \ > __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res); \ > - register typeof(a7) r7 asm("r7") = __a7 > + register typeof(a7) r7 ASM_REG(7) = __a7 > > #define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__) > #define __declare_args(count, ...) ___declare_args(count, __VA_ARGS__) > -- Julien Grall _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
On Mon, 17 Feb 2020, Julien Grall wrote: > Clang 8.0 (see [1]) and by extent some of the version of armclang does > not support register allocation using the syntax rN. > > Thankfully, both GCC [2] and clang are able to support the xN syntax for > Arm64. Introduce a new macro ASM_REG() and use in common code for > register allocation. > > [1] https://reviews.llvm.org/rL328829 > [2] https://gcc.gnu.org/onlinedocs/gcc/Machine-Constraints.html > > Cc: Andrii Anisov <andrii_anisov@epam.com> > Signed-off-by: Julien Grall <julien@xen.org> Thanks for the patch, it looks reasonable and the approach looks OK to me. Tested-by: Stefano Stabellini <sstabellini@kernel.org> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> > --- > xen/include/asm-arm/asm_defns.h | 8 +++- > xen/include/asm-arm/smccc.h | 74 ++++++++++++++++----------------- > 2 files changed, 44 insertions(+), 38 deletions(-) > > diff --git a/xen/include/asm-arm/asm_defns.h b/xen/include/asm-arm/asm_defns.h > index b4fbcdae1d..29a9dbb002 100644 > --- a/xen/include/asm-arm/asm_defns.h > +++ b/xen/include/asm-arm/asm_defns.h > @@ -7,11 +7,17 @@ > #endif > #include <asm/processor.h> > > -/* For generic assembly code: use macros to define operand sizes. */ > +/* Macros for generic assembly code */ > #if defined(CONFIG_ARM_32) > # define __OP32 > +# define ASM_REG(index) asm("r" # index) > #elif defined(CONFIG_ARM_64) > # define __OP32 "w" > +/* > + * Clang < 8.0 doesn't support register alllocation using the syntax rN. > + * See https://reviews.llvm.org/rL328829. > + */ > +# define ASM_REG(index) asm("x" # index) > #else > # error "unknown ARM variant" > #endif > diff --git a/xen/include/asm-arm/smccc.h b/xen/include/asm-arm/smccc.h > index 126399dd70..9d94beb3df 100644 > --- a/xen/include/asm-arm/smccc.h > +++ b/xen/include/asm-arm/smccc.h > @@ -120,59 +120,59 @@ struct arm_smccc_res { > #define __constraint_read_6 __constraint_read_5, "r" (r6) > #define __constraint_read_7 __constraint_read_6, "r" (r7) > > -#define __declare_arg_0(a0, res) \ > - struct arm_smccc_res *___res = res; \ > - register unsigned long r0 asm("r0") = (uint32_t)a0;\ > - register unsigned long r1 asm("r1"); \ > - register unsigned long r2 asm("r2"); \ > - register unsigned long r3 asm("r3") > - > -#define __declare_arg_1(a0, a1, res) \ > - typeof(a1) __a1 = a1; \ > - struct arm_smccc_res *___res = res; \ > - register unsigned long r0 asm("r0") = (uint32_t)a0;\ > - register unsigned long r1 asm("r1") = __a1; \ > - register unsigned long r2 asm("r2"); \ > - register unsigned long r3 asm("r3") > - > -#define __declare_arg_2(a0, a1, a2, res) \ > - typeof(a1) __a1 = a1; \ > - typeof(a2) __a2 = a2; \ > - struct arm_smccc_res *___res = res; \ > - register unsigned long r0 asm("r0") = (uint32_t)a0;\ > - register unsigned long r1 asm("r1") = __a1; \ > - register unsigned long r2 asm("r2") = __a2; \ > - register unsigned long r3 asm("r3") > - > -#define __declare_arg_3(a0, a1, a2, a3, res) \ > - typeof(a1) __a1 = a1; \ > - typeof(a2) __a2 = a2; \ > - typeof(a3) __a3 = a3; \ > - struct arm_smccc_res *___res = res; \ > - register unsigned long r0 asm("r0") = (uint32_t)a0;\ > - register unsigned long r1 asm("r1") = __a1; \ > - register unsigned long r2 asm("r2") = __a2; \ > - register unsigned long r3 asm("r3") = __a3 > +#define __declare_arg_0(a0, res) \ > + struct arm_smccc_res *___res = res; \ > + register unsigned long r0 ASM_REG(0) = (uint32_t)a0; \ > + register unsigned long r1 ASM_REG(1); \ > + register unsigned long r2 ASM_REG(2); \ > + register unsigned long r3 ASM_REG(3) > + > +#define __declare_arg_1(a0, a1, res) \ > + typeof(a1) __a1 = a1; \ > + struct arm_smccc_res *___res = res; \ > + register unsigned long r0 ASM_REG(0) = (uint32_t)a0; \ > + register unsigned long r1 ASM_REG(1) = __a1; \ > + register unsigned long r2 ASM_REG(2); \ > + register unsigned long r3 ASM_REG(3) > + > +#define __declare_arg_2(a0, a1, a2, res) \ > + typeof(a1) __a1 = a1; \ > + typeof(a2) __a2 = a2; \ > + struct arm_smccc_res *___res = res; \ > + register unsigned long r0 ASM_REG(0) = (uint32_t)a0; \ > + register unsigned long r1 ASM_REG(1) = __a1; \ > + register unsigned long r2 ASM_REG(2) = __a2; \ > + register unsigned long r3 ASM_REG(3) > + > +#define __declare_arg_3(a0, a1, a2, a3, res) \ > + typeof(a1) __a1 = a1; \ > + typeof(a2) __a2 = a2; \ > + typeof(a3) __a3 = a3; \ > + struct arm_smccc_res *___res = res; \ > + register unsigned long r0 ASM_REG(0) = (uint32_t)a0; \ > + register unsigned long r1 ASM_REG(1) = __a1; \ > + register unsigned long r2 ASM_REG(2) = __a2; \ > + register unsigned long r3 ASM_REG(3) = __a3 > > #define __declare_arg_4(a0, a1, a2, a3, a4, res) \ > typeof(a4) __a4 = a4; \ > __declare_arg_3(a0, a1, a2, a3, res); \ > - register unsigned long r4 asm("r4") = __a4 > + register unsigned long r4 ASM_REG(4) = __a4 > > #define __declare_arg_5(a0, a1, a2, a3, a4, a5, res) \ > typeof(a5) __a5 = a5; \ > __declare_arg_4(a0, a1, a2, a3, a4, res); \ > - register typeof(a5) r5 asm("r5") = __a5 > + register typeof(a5) r5 ASM_REG(5) = __a5 > > #define __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res) \ > typeof(a6) __a6 = a6; \ > __declare_arg_5(a0, a1, a2, a3, a4, a5, res); \ > - register typeof(a6) r6 asm("r6") = __a6 > + register typeof(a6) r6 ASM_REG(6) = __a6 > > #define __declare_arg_7(a0, a1, a2, a3, a4, a5, a6, a7, res) \ > typeof(a7) __a7 = a7; \ > __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res); \ > - register typeof(a7) r7 asm("r7") = __a7 > + register typeof(a7) r7 ASM_REG(7) = __a7 > > #define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__) > #define __declare_args(count, ...) ___declare_args(count, __VA_ARGS__) > -- > 2.17.1 > _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
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