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tools/nolibc/sys: Implement mmap()
and munmap()
Implement mmap() and munmap(). Currently, they are only available for architecures that have my_syscall6 macro. For architectures that don't have, this function will return -1 with errno set to ENOSYS (Function not implemented). This has been tested on x86 and i386. Notes for i386: 1) The common mmap() syscall implementation uses __NR_mmap2 instead of __NR_mmap. 2) The offset must be shifted-right by 12-bit. Acked-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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@ -14,6 +14,7 @@
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#include <asm/unistd.h>
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#include <asm/signal.h> // for SIGCHLD
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#include <asm/ioctls.h>
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#include <asm/mman.h>
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#include <linux/fs.h>
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#include <linux/loop.h>
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#include <linux/time.h>
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@ -675,6 +676,67 @@ int mknod(const char *path, mode_t mode, dev_t dev)
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return ret;
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}
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#ifndef MAP_SHARED
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#define MAP_SHARED 0x01 /* Share changes */
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#define MAP_PRIVATE 0x02 /* Changes are private */
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#define MAP_SHARED_VALIDATE 0x03 /* share + validate extension flags */
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#endif
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#ifndef MAP_FAILED
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#define MAP_FAILED ((void *)-1)
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#endif
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static __attribute__((unused))
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void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
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off_t offset)
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{
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#ifndef my_syscall6
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/* Function not implemented. */
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return -ENOSYS;
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#else
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int n;
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#if defined(__i386__)
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n = __NR_mmap2;
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offset >>= 12;
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#else
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n = __NR_mmap;
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#endif
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return (void *)my_syscall6(n, addr, length, prot, flags, fd, offset);
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#endif
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}
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static __attribute__((unused))
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void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
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{
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void *ret = sys_mmap(addr, length, prot, flags, fd, offset);
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if ((unsigned long)ret >= -4095UL) {
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SET_ERRNO(-(long)ret);
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ret = MAP_FAILED;
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}
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return ret;
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}
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static __attribute__((unused))
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int sys_munmap(void *addr, size_t length)
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{
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return my_syscall2(__NR_munmap, addr, length);
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}
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static __attribute__((unused))
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int munmap(void *addr, size_t length)
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{
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int ret = sys_munmap(addr, length);
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if (ret < 0) {
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SET_ERRNO(-ret);
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ret = -1;
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}
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return ret;
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}
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/*
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* int mount(const char *source, const char *target,
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