[Minios-devel] [UNIKRAFT PATCH v2 4/5] lib/syscall_shim: Provide uk_vsyscall(), uk_vsyscall_r()

[Simon Kuenzer <simon.kuenzer@xxxxxxxxx>]

Provide a variant to the general and raw system call function
uk_syscall() and uk_syscall_r() that accepts a va_list argument instead:

    long uk_vsyscall(long n, va_list arg);
    long uk_vsyscall_r(long n, va_list arg);

Signed-off-by: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
---
 lib/syscall_shim/include/uk/syscall.h  |  3 +++
 lib/syscall_shim/uk_syscall.c.in_end   | 12 ++++++++++++
 lib/syscall_shim/uk_syscall_r.c.in_end | 12 ++++++++++++
 3 files changed, 27 insertions(+)

diff --git a/lib/syscall_shim/include/uk/syscall.h 
b/lib/syscall_shim/include/uk/syscall.h
index aafe20a7..dc7bc7ef 100644
--- a/lib/syscall_shim/include/uk/syscall.h
+++ b/lib/syscall_shim/include/uk/syscall.h
@@ -41,6 +41,7 @@
 #include <uk/essentials.h>
 #include <uk/errptr.h>
 #include <errno.h>
+#include <stdarg.h>
 #include <uk/print.h>
 
 /*
@@ -288,6 +289,7 @@ typedef long uk_syscall_arg_t;
 
 /* System call, returns -1 and sets errno on errors */
 long uk_syscall(long n, ...);
+long uk_vsyscall(long n, va_list arg);
 
 /*
  * Use this variant instead of `uk_syscall()` whenever the system call number
@@ -299,6 +301,7 @@ long uk_syscall(long n, ...);
 
 /* Raw system call, returns negative codes on errors */
 long uk_syscall_r(long n, ...);
+long uk_vsyscall_r(long n, va_list arg);
 
 /*
  * Use this variant instead of `uk_syscall_r()` whenever the system call number
diff --git a/lib/syscall_shim/uk_syscall.c.in_end 
b/lib/syscall_shim/uk_syscall.c.in_end
index 79a8b7fd..8a5f8e0b 100644
--- a/lib/syscall_shim/uk_syscall.c.in_end
+++ b/lib/syscall_shim/uk_syscall.c.in_end
@@ -13,3 +13,15 @@ long uk_syscall(long n, ...)
        va_end(ap);
        return __uk_syscall(n,a,b,c,d,e,f);
 }
+
+long uk_vsyscall(long n, va_list arg)
+{
+       long a,b,c,d,e,f;
+       a=va_arg(arg, long);
+       b=va_arg(arg, long);
+       c=va_arg(arg, long);
+       d=va_arg(arg, long);
+       e=va_arg(arg, long);
+       f=va_arg(arg, long);
+       return __uk_syscall(n,a,b,c,d,e,f);
+}
diff --git a/lib/syscall_shim/uk_syscall_r.c.in_end 
b/lib/syscall_shim/uk_syscall_r.c.in_end
index ee8a5689..ae74716e 100644
--- a/lib/syscall_shim/uk_syscall_r.c.in_end
+++ b/lib/syscall_shim/uk_syscall_r.c.in_end
@@ -14,6 +14,18 @@ long uk_syscall_r(long n, ...)
        return __uk_syscall_r(n,a,b,c,d,e,f);
 }
 
+long uk_vsyscall_r(long n, va_list arg)
+{
+       long a,b,c,d,e,f;
+       a=va_arg(arg, long);
+       b=va_arg(arg, long);
+       c=va_arg(arg, long);
+       d=va_arg(arg, long);
+       e=va_arg(arg, long);
+       f=va_arg(arg, long);
+       return __uk_syscall_r(n,a,b,c,d,e,f);
+}
+
 #if CONFIG_LIBSYSCALL_SHIM_HANDLER
 #include <uk/plat/syscall.h>
 #include <uk/assert.h>
-- 
2.20.1


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