linux-kernel - [PATCH v5 11/14] tools/nolibc: clean up mmap() support

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Date:   Wed, 28 Jun 2023 21:41:13 +0800
From:   Zhangjin Wu <falcon@...ylab.org>
To:     thomas@...ch.de, w@....eu
Cc:     falcon@...ylab.org, arnd@...db.de, david.laight@...lab.com,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: [PATCH v5 11/14] tools/nolibc: clean up mmap() support

Do several cleanups together:

- Since all supported architectures have my_syscall6() now, remove the
  #ifdef check.

- Move the mmap() related macros to tools/include/nolibc/types.h and
  reuse most of them from <linux/mman.h>

- Apply the new __sysret() to convert the calling of sys_map() to
  oneline code

Signed-off-by: Zhangjin Wu <falcon@...ylab.org>
---
 tools/include/nolibc/sys.h   | 24 +-----------------------
 tools/include/nolibc/types.h |  6 ++++++
 2 files changed, 7 insertions(+), 23 deletions(-)

diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h
index b6125e600dc2..e0ac95a4bfa1 100644
--- a/tools/include/nolibc/sys.h
+++ b/tools/include/nolibc/sys.h
@@ -632,26 +632,11 @@ int mknod(const char *path, mode_t mode, dev_t dev)
 	return __sysret(sys_mknod(path, mode, dev));
 }
 
-#ifndef MAP_SHARED
-#define MAP_SHARED		0x01	/* Share changes */
-#define MAP_PRIVATE		0x02	/* Changes are private */
-#define MAP_SHARED_VALIDATE	0x03	/* share + validate extension flags */
-#endif
-
-#ifndef MAP_FAILED
-#define MAP_FAILED ((void *)-1)
-#endif
-
 #ifndef sys_mmap
 static __attribute__((unused))
 void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
 	       off_t offset)
 {
-#ifndef my_syscall6
-	/* Function not implemented. */
-	return (void *)-ENOSYS;
-#else
-
 	int n;
 
 #if defined(__NR_mmap2)
@@ -662,20 +647,13 @@ void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
 #endif
 
 	return (void *)my_syscall6(n, addr, length, prot, flags, fd, offset);
-#endif
 }
 #endif
 
 static __attribute__((unused))
 void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
 {
-	void *ret = sys_mmap(addr, length, prot, flags, fd, offset);
-
-	if ((unsigned long)ret >= -4095UL) {
-		SET_ERRNO(-(long)ret);
-		ret = MAP_FAILED;
-	}
-	return ret;
+	return (void *)__sysret((unsigned long)sys_mmap(addr, length, prot, flags, fd, offset));
 }
 
 static __attribute__((unused))
diff --git a/tools/include/nolibc/types.h b/tools/include/nolibc/types.h
index f96e28bff4ba..bed62da7877c 100644
--- a/tools/include/nolibc/types.h
+++ b/tools/include/nolibc/types.h
@@ -10,6 +10,7 @@
 #include "std.h"
 #include <linux/time.h>
 #include <linux/stat.h>
+#include <linux/mman.h>
 
 
 /* Only the generic macros and types may be defined here. The arch-specific
@@ -81,6 +82,11 @@
 #define MAXPATHLEN     (PATH_MAX)
 #endif
 
+/* flags for mmap */
+#ifndef MAP_FAILED
+#define MAP_FAILED ((void *)-1)
+#endif
+
 /* whence values for lseek() */
 #define SEEK_SET       0
 #define SEEK_CUR       1
-- 
2.25.1