lib/syscall_shim: Autogenerate `uk_syscall_*` symbols at build time

Introduce a new AWK script that autogenerates an additional, custom
defined, exportsyms that contains all `uk_syscall_*` symbols as per
each library's `UK_SYSCALLS_PROVIDED-*`.

This will help in reducing exportsyms.uk noise from now on as we no
longer have to manually add these supposedly internal symbols.

Checkpatch-Ignore: SPDX_LICENSE_TAG
Signed-off-by: Sergiu Moga <sergiu@unikraft.io>
Reviewed-by: Michalis Pappas <michalis@unikraft.io>
Approved-by: Michalis Pappas <michalis@unikraft.io>
GitHub-Closes: #1577

diff --git a/lib/syscall_shim/Makefile.uk b/lib/syscall_shim/Makefile.uk
index e7af8229fa8c3043cbe2e6181e72b507daa3a57b..dd43e8c3466080f7725282c6e2c2a24c35f8432d 100644 (file)
--- a/lib/syscall_shim/Makefile.uk
+++ b/lib/syscall_shim/Makefile.uk
@@ -43,6 +43,10 @@ LIBSYSCALL_SHIM_SRCS-y += $(LIBSYSCALL_SHIM_BASE)/syscall_provided.awk>.h
 LIBSYSCALL_SHIM_SYSCALL_PROVIDED_SUBBUILD = $(LIBSYSCALL_SHIM_INCLUDES_SUBBUILD)
 LIBSYSCALL_SHIM_SYSCALL_PROVIDED_AWKINCLUDES-y += $(LIBSYSCALL_SHIM_BUILD)/provided_syscalls.in
 LIBSYSCALL_SHIM_SYSCALL_PROVIDED_AWKFLAGS-y += -F '-'
+LIBSYSCALL_SHIM_SRCS-y += $(LIBSYSCALL_SHIM_BASE)/syscall_gensyms.awk>.exportsyms.uk
+LIBSYSCALL_SHIM_SYSCALL_GENSYMS_AWKINCLUDES-y += $(LIBSYSCALL_SHIM_BUILD)/provided_syscalls.in
+LIBSYSCALL_SHIM_SYSCALL_GENSYMS_AWKFLAGS-y += -F '-'
+EACHOLIB_EXPORTS-$(CONFIG_LIBSYSCALL_SHIM) += $(LIBSYSCALL_SHIM_BUILD)/syscall_gensyms.exportsyms.uk
 LIBSYSCALL_SHIM_SRCS-y += $(LIBSYSCALL_SHIM_BASE)/syscall_static.awk>.h
 LIBSYSCALL_SHIM_SYSCALL_STATIC_SUBBUILD = $(LIBSYSCALL_SHIM_INCLUDES_SUBBUILD)
 LIBSYSCALL_SHIM_SYSCALL_STATIC_AWKINCLUDES-y += $(LIBSYSCALL_SHIM_BUILD)/provided_syscalls.in

diff --git a/lib/syscall_shim/syscall_gensyms.awk b/lib/syscall_shim/syscall_gensyms.awk
new file mode 100644 (file)
index 0000000..194ad0b
--- /dev/null
+++ b/lib/syscall_shim/syscall_gensyms.awk
@@ -0,0 +1,9 @@
+/[a-zA-Z0-9]+-[0-9]+e?/{
+       name = $1;
+       printf "uk_syscall_r_%s\n", name;
+       printf "uk_syscall_e_%s\n", name;
+       if (substr($0, length($0)) == "e") {
+               printf "uk_syscall_r_e_%s\n", name;
+               printf "uk_syscall_e_e_%s\n", name;
+       }
+}