mirror of
https://git.musl-libc.org/git/musl
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d00ff2950e
this commit shuffles around the location of syscall definitions so that we can make a syscall() library function with both SYS_* and __NR_* style syscall names available to user applications, provides the syscall() library function, and optimizes the code that performs the actual inline syscalls in the library itself. previously on i386 when built as PIC (shared library), syscalls were incurring bus lock (lock prefix) overhead at entry and exit, due to the way the ebx register was being loaded (xchg instruction with a memory operand). now the xchg takes place between two registers. further cleanup to arch/$(ARCH)/syscall.h is planned.
168 lines
5.1 KiB
C
168 lines
5.1 KiB
C
#ifndef _SYSCALL_H
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#define _SYSCALL_H
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#include <sys/syscall.h>
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#define SYSCALL_LL(x) \
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((union { long long ll; long l[2]; }){ .ll = x }).l[0], \
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((union { long long ll; long l[2]; }){ .ll = x }).l[1]
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#define SYSCALL_SIGSET_SIZE 8
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#if defined(SYSCALL_NORETURN)
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static inline long __syscall_ret(unsigned long r)
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{
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for(;;);
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return 0;
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}
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#elif defined(SYSCALL_RETURN_ERRNO)
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static inline long __syscall_ret(unsigned long r)
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{
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return -r;
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}
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#else
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extern long __syscall_ret(unsigned long);
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#endif
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static inline long syscall0(long n)
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{
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unsigned long ret;
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__asm__ __volatile__ ("int $128" : "=a"(ret) : "a"(n) : "memory");
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return __syscall_ret(ret);
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}
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#ifndef __PIC__
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static inline long syscall1(long n, long a1)
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{
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unsigned long ret;
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__asm__ __volatile__ ("int $128" : "=a"(ret) : "a"(n), "b"(a1) : "memory");
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return __syscall_ret(ret);
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}
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static inline long syscall2(long n, long a1, long a2)
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{
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unsigned long ret;
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__asm__ __volatile__ ("int $128" : "=a"(ret) : "a"(n), "b"(a1), "c"(a2) : "memory");
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return __syscall_ret(ret);
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}
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static inline long syscall3(long n, long a1, long a2, long a3)
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{
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unsigned long ret;
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__asm__ __volatile__ ("int $128" : "=a"(ret) : "a"(n), "b"(a1), "c"(a2), "d"(a3) : "memory");
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return __syscall_ret(ret);
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}
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static inline long syscall4(long n, long a1, long a2, long a3, long a4)
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{
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unsigned long ret;
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__asm__ __volatile__ ("int $128" : "=a"(ret) : "a"(n), "b"(a1), "c"(a2), "d"(a3), "S"(a4) : "memory");
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return __syscall_ret(ret);
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}
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static inline long syscall5(long n, long a1, long a2, long a3, long a4, long a5)
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{
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unsigned long ret;
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__asm__ __volatile__ ("int $128" : "=a"(ret) : "a"(n), "b"(a1), "c"(a2), "d"(a3), "S"(a4), "D"(a5) : "memory");
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return __syscall_ret(ret);
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}
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static inline long syscall6(long n, long a1, long a2, long a3, long a4, long a5, long a6)
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{
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unsigned long ret;
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__asm__ __volatile__ ("pushl %%ebp ; mov %%eax,%%ebp ; movl %1,%%eax ; int $128 ; popl %%ebp"
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: "=a"(ret) : "i"(n), "b"(a1), "c"(a2), "d"(a3), "S"(a4), "D"(a5), "a"(a6) : "memory");
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return __syscall_ret(ret);
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}
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#else
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static inline long syscall1(long n, long a1)
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{
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unsigned long ret;
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__asm__ __volatile__ ("xchg %2,%%ebx ; int $128 ; xchg %2,%%ebx"
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: "=a"(ret) : "a"(n), "r"(a1) : "memory");
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return __syscall_ret(ret);
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}
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static inline long syscall2(long n, long a1, long a2)
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{
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unsigned long ret;
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__asm__ __volatile__ ("xchg %2,%%ebx ; int $128 ; xchg %2,%%ebx"
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: "=a"(ret) : "a"(n), "r"(a1), "c"(a2) : "memory");
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return __syscall_ret(ret);
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}
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static inline long syscall3(long n, long a1, long a2, long a3)
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{
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unsigned long ret;
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__asm__ __volatile__ ("xchg %2,%%ebx ; int $128 ; xchg %2,%%ebx"
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: "=a"(ret) : "a"(n), "r"(a1), "c"(a2), "d"(a3) : "memory");
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return __syscall_ret(ret);
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}
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static inline long syscall4(long n, long a1, long a2, long a3, long a4)
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{
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unsigned long ret;
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__asm__ __volatile__ ("xchg %2,%%ebx ; int $128 ; xchg %2,%%ebx"
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: "=a"(ret) : "a"(n), "r"(a1), "c"(a2), "d"(a3), "S"(a4) : "memory");
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return __syscall_ret(ret);
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}
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static inline long syscall5(long n, long a1, long a2, long a3, long a4, long a5)
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{
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unsigned long ret;
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__asm__ __volatile__ ("pushl %%ebx ; mov %%eax,%%ebx ; movl %1,%%eax ; int $128 ; popl %%ebx"
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: "=a"(ret) : "i"(n), "a"(a1), "c"(a2), "d"(a3), "S"(a4), "D"(a5) : "memory");
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return __syscall_ret(ret);
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}
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#define syscall6(n,a1,a2,a3,a4,a5,a6) __syscall((n),(a1),(a2),(a3),(a4),(a5),(a6))
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#endif
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#define __SC_socket 1
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#define __SC_bind 2
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#define __SC_connect 3
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#define __SC_listen 4
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#define __SC_accept 5
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#define __SC_getsockname 6
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#define __SC_getpeername 7
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#define __SC_socketpair 8
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#define __SC_send 9
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#define __SC_recv 10
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#define __SC_sendto 11
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#define __SC_recvfrom 12
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#define __SC_shutdown 13
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#define __SC_setsockopt 14
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#define __SC_getsockopt 15
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#define __SC_sendmsg 16
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#define __SC_recvmsg 17
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#define socketcall(nm, a, b, c, d, e, f) syscall2(__NR_socketcall, __SC_##nm, \
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(long)(long [6]){ (long)a, (long)b, (long)c, (long)d, (long)e, (long)f })
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#undef O_LARGEFILE
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#define O_LARGEFILE 0100000
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/* the following are needed for iso c functions to use */
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#define __syscall_open(filename, flags, mode) syscall3(__NR_open, (long)(filename), (flags)|O_LARGEFILE, (mode))
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#define __syscall_read(fd, buf, len) syscall3(__NR_read, (fd), (long)(buf), (len))
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#define __syscall_write(fd, buf, len) syscall3(__NR_write, (fd), (long)(buf), (len))
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#define __syscall_close(fd) syscall1(__NR_close, (fd))
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#define __syscall_fcntl(fd, cmd, arg) syscall3(__NR_fcntl64, (fd), (cmd), (long)(arg))
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#define __syscall_dup2(old, new) syscall2(__NR_dup2, (old), (new))
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#define __syscall_unlink(path) syscall1(__NR_unlink, (long)(path))
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#define __syscall_getpid() syscall0(__NR_getpid)
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#define __syscall_kill(pid,sig) syscall2(__NR_kill, (pid), (sig))
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#define __syscall_sigaction(sig,new,old) syscall4(__NR_rt_sigaction, (sig), (long)(new), (long)(old), SYSCALL_SIGSET_SIZE)
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#define __syscall_ioctl(fd,ioc,arg) syscall3(__NR_ioctl, (fd), (ioc), (long)(arg))
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#define __syscall_exit(code) syscall1(__NR_exit, code)
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long __syscall(long, ...);
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#endif
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