@@ -0,0 +1,56 @@
+#ifndef __LINKAGE_H__
+#define __LINKAGE_H__
+
+#ifdef __ASSEMBLY__
+
+#include <xen/macros.h>
+
+#ifndef CODE_ALIGN
+# define CODE_ALIGN ??
+#endif
+#ifndef CODE_FILL
+# define CODE_FILL ~0
+#endif
+
+#ifndef DATA_ALIGN
+# define DATA_ALIGN 0
+#endif
+#ifndef DATA_FILL
+# define DATA_FILL ~0
+#endif
+
+#define SYM_ALIGN(algn...) .balign algn
+
+#define SYM_L_GLOBAL(name) .globl name
+#define SYM_L_WEAK(name) .weak name
+#define SYM_L_LOCAL(name) /* nothing */
+
+#define SYM_T_FUNC STT_FUNC
+#define SYM_T_DATA STT_OBJECT
+#define SYM_T_NONE STT_NOTYPE
+
+#define SYM(name, typ, linkage, algn...) \
+ .type name, SYM_T_ ## typ; \
+ SYM_L_ ## linkage(name); \
+ SYM_ALIGN(algn); \
+ name:
+
+#define END(name) .size name, . - name
+
+#define FUNC(name, algn...) \
+ SYM(name, FUNC, GLOBAL, LASTARG(CODE_ALIGN, ## algn), CODE_FILL)
+#define LABEL(name, algn...) \
+ SYM(name, NONE, GLOBAL, LASTARG(CODE_ALIGN, ## algn), CODE_FILL)
+#define DATA(name, algn...) \
+ SYM(name, DATA, GLOBAL, LASTARG(DATA_ALIGN, ## algn), DATA_FILL)
+
+#define FUNC_LOCAL(name, algn...) \
+ SYM(name, FUNC, LOCAL, LASTARG(CODE_ALIGN, ## algn), CODE_FILL)
+#define LABEL_LOCAL(name, algn...) \
+ SYM(name, NONE, LOCAL, LASTARG(CODE_ALIGN, ## algn), CODE_FILL)
+#define DATA_LOCAL(name, algn...) \
+ SYM(name, DATA, LOCAL, LASTARG(DATA_ALIGN, ## algn), DATA_FILL)
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __LINKAGE_H__ */
@@ -15,6 +15,15 @@
#define count_args(args...) \
count_args_(., ## args, 8, 7, 6, 5, 4, 3, 2, 1, 0)
+#define ARG1_(x, y...) (x)
+#define ARG2_(x, y...) ARG1_(y)
+#define ARG3_(x, y...) ARG2_(y)
+#define ARG4_(x, y...) ARG3_(y)
+
+#define ARG__(nr) ARG ## nr ## _
+#define ARG_(nr) ARG__(nr)
+#define LASTARG(x, y...) ARG_(count_args(x, ## y))(x, ## y)
+
/* Indirect macros required for expanded argument pasting. */
#define PASTE_(a, b) a ## b
#define PASTE(a, b) PASTE_(a, b)
Recent gas versions generate minimalistic Dwarf debug info for items annotated as functions and having their sizes specified [1]. Furthermore generating live patches wants items properly annotated. "Borrow" Arm's END() and (remotely) derive other annotation infrastructure from Linux'es, for all architectures to use. Signed-off-by: Jan Beulich <jbeulich@suse.com> [1] https://sourceware.org/git?p=binutils-gdb.git;a=commitdiff;h=591cc9fbbfd6d51131c0f1d4a92e7893edcc7a28 --- v3: New, generalized from earlier x86-only version. LAST() (now LASTARG()) moved to macros.h. --- TBD: What to set CODE_ALIGN to by default? Or should we requires arch-es to define that in all cases? TBD: {CODE,DATA}_ALIGN are byte granular, such that a value of 0 can be specified (in case this has some special meaning on an arch; conceivably it could mean to use some kind of arch default). We may not strictly need that, and hence we could also make these power-of -2 values (using .p2align). Note that we can't use ALIGN() (in place of SYM_ALIGN()) as long as we still have ALIGN. Note further that FUNC()'s etc "algn" parameter is intended to allow for only no or a single argument. If we wanted to also make the fill value customizable per call site, the constructs would need re-doing to some degree.