cleaning up syscalls in preparation for x86_64 port

- hide all the legacy xxxxxx32 name cruft in syscall.h so the actual
source files can be clean and uniform across all archs.

- cleanup llseek/lseek and mmap2/mmap handling for 32/64 bit systems

- alternate implementation for nice if the target lacks nice syscall

src/internal/syscall.h

@@ -439,6 +439,46 @@ static inline long syscall6(long n, long a1, long a2, long a3, long a4, long a5,
 #define __NR_preadv		333
 #define __NR_pwritev		334
 
+/* fixup legacy 16-bit junk */
+#undef __NR_lchown
+#undef __NR_getuid
+#undef __NR_getgid
+#undef __NR_geteuid
+#undef __NR_getegid
+#undef __NR_setreuid
+#undef __NR_setregid
+#undef __NR_getgroups
+#undef __NR_setgroups
+#undef __NR_fchown
+#undef __NR_setresuid
+#undef __NR_getresuid
+#undef __NR_setresgid
+#undef __NR_getresgid
+#undef __NR_chown
+#undef __NR_setuid
+#undef __NR_setgid
+#undef __NR_setfsuid
+#undef __NR_setfsgid
+#define __NR_lchown __NR_lchown32
+#define __NR_getuid __NR_getuid32
+#define __NR_getgid __NR_getgid32
+#define __NR_geteuid __NR_geteuid32
+#define __NR_getegid __NR_getegid32
+#define __NR_setreuid __NR_setreuid32
+#define __NR_setregid __NR_setregid32
+#define __NR_getgroups __NR_getgroups32
+#define __NR_setgroups __NR_setgroups32
+#define __NR_fchown __NR_fchown32
+#define __NR_setresuid __NR_setresuid32
+#define __NR_getresuid __NR_getresuid32
+#define __NR_setresgid __NR_setresgid32
+#define __NR_getresgid __NR_getresgid32
+#define __NR_chown __NR_chown32
+#define __NR_setuid __NR_setuid32
+#define __NR_setgid __NR_setgid32
+#define __NR_setfsuid __NR_setfsuid32
+#define __NR_setfsgid __NR_setfsgid32
+
 
 #undef O_LARGEFILE
 #define O_LARGEFILE 0100000
@@ -457,13 +497,4 @@ static inline long syscall6(long n, long a1, long a2, long a3, long a4, long a5,
 #define __syscall_ioctl(fd,ioc,arg)           syscall3(__NR_ioctl, (fd), (ioc), (long)(arg))
 #define __syscall_exit(code)                  syscall1(__NR_exit, code)
 
-#define __NEED_off_t
-#include <bits/alltypes.h>
-
-static inline off_t __syscall_lseek(int fd, off_t offset, int whence)
-{
-	off_t result;
-	return syscall5(__NR__llseek, fd, offset>>32, offset, (long)&result, whence) ? -1 : result;
-}
-
 #endif

src/linux/setgroups.c

 #include <unistd.h>
-#define SYSCALL_STANDALONE
 #include "syscall.h"
 
 int setgroups(int count, const gid_t list[])
 {
-	/* this depends on our gid_t being 32bit */
-	return syscall2(__NR_setgroups32, count, (long)list);
+	return syscall2(__NR_setgroups, count, (long)list);
 }

src/mman/mmap.c

@@ -10,7 +10,11 @@ void *__mmap(void *start, size_t len, int prot, int flags, int fd, off_t off)
 	if (sizeof(off_t) > sizeof(long))
 		if (((long)off & 0xfff) | ((long)((unsigned long long)off>>(12 + 8*(sizeof(off_t)-sizeof(long))))))
 			start = (void *)-1;
+#ifdef __NR_mmap2
 	return (void *)syscall6(__NR_mmap2, (long)start, len, prot, flags, fd, off>>12);
+#else
+	return (void *)syscall6(__NR_mmap, (long)start, len, prot, flags, fd, off);
+#endif
 }
 
 weak_alias(__mmap, mmap);

src/stdio/__stdio_seek.c

@@ -7,7 +7,13 @@ static off_t retneg1(FILE *f, off_t off, int whence)
 
 off_t __stdio_seek(FILE *f, off_t off, int whence)
 {
-	off_t ret = __syscall_lseek(f->fd, off, whence);
+	off_t ret;
+#ifdef __NR__llseek
+	if (syscall5(__NR__llseek, f->fd, off>>32, off, (long)&ret, whence)<0)
+		ret = -1;
+#else
+	ret = syscall3(__NR_lseek, f->fd, off, whence);
+#endif
 	/* Detect unseekable files and optimize future failures out */
 	if (ret < 0 && off == 0 && whence == SEEK_CUR)
 		f->seek = retneg1;

src/unistd/chown.c

@@ -3,5 +3,5 @@
 
 int chown(const char *path, uid_t uid, gid_t gid)
 {
-	return syscall3(__NR_chown32, (long)path, uid, gid);
+	return syscall3(__NR_chown, (long)path, uid, gid);
 }

src/unistd/fchown.c

@@ -3,5 +3,5 @@
 
 int fchown(int fd, uid_t uid, gid_t gid)
 {
-	return syscall3(__NR_fchown32, fd, uid, gid);
+	return syscall3(__NR_fchown, fd, uid, gid);
 }

src/unistd/getegid.c

@@ -3,5 +3,5 @@
 
 gid_t getegid(void)
 {
-	return syscall0(__NR_getegid32);
+	return syscall0(__NR_getegid);
 }

src/unistd/geteuid.c

@@ -3,5 +3,5 @@
 
 uid_t geteuid(void)
 {
-	return syscall0(__NR_geteuid32);
+	return syscall0(__NR_geteuid);
 }

src/unistd/getgid.c

@@ -3,5 +3,5 @@
 
 gid_t getgid(void)
 {
-	return syscall0(__NR_getgid32);
+	return syscall0(__NR_getgid);
 }

src/unistd/getgroups.c

@@ -3,6 +3,5 @@
 
 int getgroups(int count, gid_t list[])
 {
-	/* this depends on our gid_t being 32bit */
-	return syscall2(__NR_getgroups32, count, (long)list);
+	return syscall2(__NR_getgroups, count, (long)list);
 }

src/unistd/getuid.c

@@ -3,5 +3,5 @@
 
 uid_t getuid(void)
 {
-	return syscall0(__NR_getuid32);
+	return syscall0(__NR_getuid);
 }

src/unistd/lchown.c

@@ -3,5 +3,5 @@
 
 int lchown(const char *path, uid_t uid, gid_t gid)
 {
-	return syscall3(__NR_lchown32, (long)path, uid, gid);
+	return syscall3(__NR_lchown, (long)path, uid, gid);
 }

src/unistd/lseek.c

@@ -4,13 +4,12 @@
 
 off_t lseek(int fd, off_t offset, int whence)
 {
-	/* optimized away at compiletime */
-	if (sizeof(long) == 8)
-		return syscall3(__NR_lseek, fd, offset, whence);
-	else {
-		off_t result;
-		return syscall5(__NR__llseek, fd, offset>>32, offset, (long)&result, whence) ? -1 : result;
-	}
+#ifdef __NR__llseek
+	off_t result;
+	return syscall5(__NR__llseek, fd, offset>>32, offset, (long)&result, whence) ? -1 : result;
+#else
+	return syscall3(__NR_lseek, fd, offset, whence);
+#endif
 }
 
 LFS64(lseek);

src/unistd/nice.c

 #include <unistd.h>
+#include <sys/resource.h>
 #include "syscall.h"
 
 int nice(int inc)
 {
+#ifdef __NR_nice
 	return syscall1(__NR_nice, inc);
+#else
+	return setpriority(PRIO_PROCESS, 0, getpriority(PRIO_PROCESS, 0)+inc);
+#endif
 }

src/unistd/setgid.c

@@ -4,6 +4,6 @@
 
 int setgid(gid_t gid)
 {
-	if (libc.rsyscall) return libc.rsyscall(__NR_setgid32, gid, 0, 0, 0, 0, 0);
-	return syscall1(__NR_setgid32, gid);
+	if (libc.rsyscall) return libc.rsyscall(__NR_setgid, gid, 0, 0, 0, 0, 0);
+	return syscall1(__NR_setgid, gid);
 }

src/unistd/setregid.c

@@ -4,6 +4,6 @@
 
 int setregid(gid_t rgid, gid_t egid)
 {
-	if (libc.rsyscall) return libc.rsyscall(__NR_setregid32, rgid, egid, 0, 0, 0, 0);
-	return syscall2(__NR_setregid32, rgid, egid);
+	if (libc.rsyscall) return libc.rsyscall(__NR_setregid, rgid, egid, 0, 0, 0, 0);
+	return syscall2(__NR_setregid, rgid, egid);
 }

src/unistd/setreuid.c

@@ -4,6 +4,6 @@
 
 int setreuid(uid_t ruid, uid_t euid)
 {
-	if (libc.rsyscall) return libc.rsyscall(__NR_setreuid32, ruid, euid, 0, 0, 0, 0);
-	return syscall2(__NR_setreuid32, ruid, euid);
+	if (libc.rsyscall) return libc.rsyscall(__NR_setreuid, ruid, euid, 0, 0, 0, 0);
+	return syscall2(__NR_setreuid, ruid, euid);
 }

src/unistd/setuid.c

@@ -4,6 +4,6 @@
 
 int setuid(uid_t uid)
 {
-	if (libc.rsyscall) return libc.rsyscall(__NR_setuid32, uid, 0, 0, 0, 0, 0);
-	return syscall1(__NR_setuid32, uid);
+	if (libc.rsyscall) return libc.rsyscall(__NR_setuid, uid, 0, 0, 0, 0, 0);
+	return syscall1(__NR_setuid, uid);
 }