cooker updates spilling all over the place

Only tangentially related:

- make seitan C99 again, so that I can build cooker without warnings

- make Makefiles make use of the usual conventions about assigning
  directory paths in variables, drop numbers.h as requirement for
  cooker and make it convenient to run stand-alone Makefiles

- fix up nr_syscalls.sh to be POSIX, otherwise it will give syntax
  errors on my system

- define a single, common way to refer to offsets in gluten, and
  functions to use those offsets in a safe way. Immediates are gone:
  cooker will write any bit of "data" to the read-only section

- call const what has to be const

- define on-disk layout for gluten

- add OP_NR (to check syscall numbers), rename OP_COPY_ARGS to
  OP_LOAD (it loads _selected_ stuff from arguments)

As for cooker itself:

- drop ARG_ and arg_ prefixes from struct names, and similar

- add/rework functions to build OP_NR, OP_LOAD, OP_CMP, and to
  write constant data to gluten

- add parsing for "compound" arguments, but that's not completely
  hooked into evaluation for numeric arguments yet

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 57 insertions, 40 deletions

diff --git a/cooker/cooker.h b/cooker/cooker.h
index 53aa0db..a1cc360 100644
--- a/cooker/cooker.h
+++ b/cooker/cooker.h
@@ -11,78 +11,95 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
+#include <arpa/inet.h>
 
 #define REFS_MAX			256
+#define REF_NAMEMAX			256
 #define CALL_ARGS			6
 
-struct arg_num;
-struct arg_struct;
-struct arg_select;
+struct num;
+struct field;
+struct select;
 
-union arg_value {
-	struct arg_num		*d_num;
-	struct arg_struct	*d_struct;
-	struct arg_select	*d_select;
+union desc {
+	struct num		*d_num;
+	struct field		*d_struct;
+	struct select		*d_select;
 };
 
-enum arg_type {
-	ARG_INT,
-	ARG_INTMASK,
-	ARG_INTFLAGS,
+union value {
+	int			v_int;
+	uint32_t		v_u32;
+	long long		v_num;
+};
+
+enum type {
+	INT,
+	INTMASK,
+	INTFLAGS,
 
-	ARG_U32,
-	ARG_U32MASK,
-	ARG_U32FLAGS,
+	U32,
+	U32MASK,
+	U32FLAGS,
 
-	ARG_LONG,
-	ARG_LONGMASK,
-	ARG_LONGFLAGS,
+	LONG,
+	LONGMASK,
+	LONGFLAGS,
 
-	ARG_STRING,
+	STRING,
 
-	ARG_STRUCT,
-	ARG_SELECT,
+	STRUCT,
+	SELECT,
 
-	ARG_PID,
+	PID,
 
-	ARG_PORT,
-	ARG_IPV4,
-	ARG_IPV6,
+	PORT,
+	IPV4,
+	IPV6,
 
-	ARG_FDPATH,
+	FDPATH,
 
-	ARG_TYPE_END,
+	TYPE_END,
 };
 
-#define ARG_TYPE_COUNT		(ARG_TYPE_END - 1)
+#define TYPE_COUNT		(TYPE_END - 1)
+
+#define TYPE_IS_COMPOUND(t)	((t) == STRUCT || (t) == SELECT)
+#define TYPE_IS_NUM(t)		((t) == INT || (t) == U32 || (t) == LONG)
+
+enum jump_type {
+	NEXT_BLOCK,
+	END,
+};
 
-struct arg_num {
+struct num {
 	char *name;
 	long long value;
 };
 
-struct arg_struct {
+struct field {
 	char *name;
-	enum arg_type type;
-	size_t offset;
+	enum type type;
+	off_t offset;
 
 	size_t strlen;
 
-	union arg_value desc;
+	union desc desc;
 };
 
-struct arg_select_num {
+struct select_num {
 	long long value;
 
-	enum arg_type type;
-	union arg_value desc;
+	enum type type;
+	union desc desc;
 };
 
-struct arg_select {
-	struct arg_struct *field;
+struct select {
+	struct field *field;
 
 	union {
-		struct arg_select_num *d_num;
+		struct select_num *d_num;
 	} desc;
 };
 
@@ -90,10 +107,10 @@ struct arg {
 	int pos;
 	char *name;
 
-	enum arg_type type;
+	enum type type;
 	size_t size;
 
-	union arg_value desc;
+	union desc desc;
 };
 
 #endif /* COOKER_H */