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musl/src/internal/syscall.h
Rich Felker 19563e1850 add framework to support archs without a native wait4 syscall 
this commit should make no codegen change for existing archs, but is a
prerequisite for new archs including riscv32. the wait4 emulation
backend provides both cancellable and non-cancellable variants because
waitpid is required to be a cancellation point, but all of our other
uses are not, and most of them cannot be.

based on patch by Stefan O'Rear.
2024-02-22 18:50:34 -05:00

410 lines
11 KiB
C
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#ifndef _INTERNAL_SYSCALL_H
#define _INTERNAL_SYSCALL_H
#include <features.h>
#include <errno.h>
#include <sys/syscall.h>
#include "syscall_arch.h"
#ifndef SYSCALL_RLIM_INFINITY
#define SYSCALL_RLIM_INFINITY (~0ULL)
#endif
#ifndef SYSCALL_MMAP2_UNIT
#define SYSCALL_MMAP2_UNIT 4096ULL
#endif
#ifndef __SYSCALL_LL_PRW
#define __SYSCALL_LL_PRW(x) __SYSCALL_LL_O(x)
#endif
#ifndef __scc
#define __scc(X) ((long) (X))
typedef long syscall_arg_t;
#endif
hidden long __syscall_ret(unsigned long),
__syscall_cp(syscall_arg_t, syscall_arg_t, syscall_arg_t, syscall_arg_t,
syscall_arg_t, syscall_arg_t, syscall_arg_t);
#define __syscall1(n,a) __syscall1(n,__scc(a))
#define __syscall2(n,a,b) __syscall2(n,__scc(a),__scc(b))
#define __syscall3(n,a,b,c) __syscall3(n,__scc(a),__scc(b),__scc(c))
#define __syscall4(n,a,b,c,d) __syscall4(n,__scc(a),__scc(b),__scc(c),__scc(d))
#define __syscall5(n,a,b,c,d,e) __syscall5(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e))
#define __syscall6(n,a,b,c,d,e,f) __syscall6(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e),__scc(f))
#define __syscall7(n,a,b,c,d,e,f,g) __syscall7(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e),__scc(f),__scc(g))
#define __SYSCALL_NARGS_X(a,b,c,d,e,f,g,h,n,...) n
#define __SYSCALL_NARGS(...) __SYSCALL_NARGS_X(__VA_ARGS__,7,6,5,4,3,2,1,0,)
#define __SYSCALL_CONCAT_X(a,b) a##b
#define __SYSCALL_CONCAT(a,b) __SYSCALL_CONCAT_X(a,b)
#define __SYSCALL_DISP(b,...) __SYSCALL_CONCAT(b,__SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__)
#define __syscall(...) __SYSCALL_DISP(__syscall,__VA_ARGS__)
#define syscall(...) __syscall_ret(__syscall(__VA_ARGS__))
#define socketcall(nm,a,b,c,d,e,f) __syscall_ret(__socketcall(nm,a,b,c,d,e,f))
#define socketcall_cp(nm,a,b,c,d,e,f) __syscall_ret(__socketcall_cp(nm,a,b,c,d,e,f))
#define __syscall_cp0(n) (__syscall_cp)(n,0,0,0,0,0,0)
#define __syscall_cp1(n,a) (__syscall_cp)(n,__scc(a),0,0,0,0,0)
#define __syscall_cp2(n,a,b) (__syscall_cp)(n,__scc(a),__scc(b),0,0,0,0)
#define __syscall_cp3(n,a,b,c) (__syscall_cp)(n,__scc(a),__scc(b),__scc(c),0,0,0)
#define __syscall_cp4(n,a,b,c,d) (__syscall_cp)(n,__scc(a),__scc(b),__scc(c),__scc(d),0,0)
#define __syscall_cp5(n,a,b,c,d,e) (__syscall_cp)(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e),0)
#define __syscall_cp6(n,a,b,c,d,e,f) (__syscall_cp)(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e),__scc(f))
#define __syscall_cp(...) __SYSCALL_DISP(__syscall_cp,__VA_ARGS__)
#define syscall_cp(...) __syscall_ret(__syscall_cp(__VA_ARGS__))
static inline long __alt_socketcall(int sys, int sock, int cp, syscall_arg_t a, syscall_arg_t b, syscall_arg_t c, syscall_arg_t d, syscall_arg_t e, syscall_arg_t f)
{
long r;
if (cp) r = __syscall_cp(sys, a, b, c, d, e, f);
else r = __syscall(sys, a, b, c, d, e, f);
if (r != -ENOSYS) return r;
#ifdef SYS_socketcall
if (cp) r = __syscall_cp(SYS_socketcall, sock, ((long[6]){a, b, c, d, e, f}));
else r = __syscall(SYS_socketcall, sock, ((long[6]){a, b, c, d, e, f}));
#endif
return r;
}
#define __socketcall(nm, a, b, c, d, e, f) __alt_socketcall(SYS_##nm, __SC_##nm, 0, \
__scc(a), __scc(b), __scc(c), __scc(d), __scc(e), __scc(f))
#define __socketcall_cp(nm, a, b, c, d, e, f) __alt_socketcall(SYS_##nm, __SC_##nm, 1, \
__scc(a), __scc(b), __scc(c), __scc(d), __scc(e), __scc(f))
/* fixup legacy 16-bit junk */
#ifdef SYS_getuid32
#undef SYS_lchown
#undef SYS_getuid
#undef SYS_getgid
#undef SYS_geteuid
#undef SYS_getegid
#undef SYS_setreuid
#undef SYS_setregid
#undef SYS_getgroups
#undef SYS_setgroups
#undef SYS_fchown
#undef SYS_setresuid
#undef SYS_getresuid
#undef SYS_setresgid
#undef SYS_getresgid
#undef SYS_chown
#undef SYS_setuid
#undef SYS_setgid
#undef SYS_setfsuid
#undef SYS_setfsgid
#define SYS_lchown SYS_lchown32
#define SYS_getuid SYS_getuid32
#define SYS_getgid SYS_getgid32
#define SYS_geteuid SYS_geteuid32
#define SYS_getegid SYS_getegid32
#define SYS_setreuid SYS_setreuid32
#define SYS_setregid SYS_setregid32
#define SYS_getgroups SYS_getgroups32
#define SYS_setgroups SYS_setgroups32
#define SYS_fchown SYS_fchown32
#define SYS_setresuid SYS_setresuid32
#define SYS_getresuid SYS_getresuid32
#define SYS_setresgid SYS_setresgid32
#define SYS_getresgid SYS_getresgid32
#define SYS_chown SYS_chown32
#define SYS_setuid SYS_setuid32
#define SYS_setgid SYS_setgid32
#define SYS_setfsuid SYS_setfsuid32
#define SYS_setfsgid SYS_setfsgid32
#endif
/* fixup legacy 32-bit-vs-lfs64 junk */
#ifdef SYS_fcntl64
#undef SYS_fcntl
#define SYS_fcntl SYS_fcntl64
#endif
#ifdef SYS_getdents64
#undef SYS_getdents
#define SYS_getdents SYS_getdents64
#endif
#ifdef SYS_ftruncate64
#undef SYS_ftruncate
#undef SYS_truncate
#define SYS_ftruncate SYS_ftruncate64
#define SYS_truncate SYS_truncate64
#endif
#ifdef SYS_stat64
#undef SYS_stat
#define SYS_stat SYS_stat64
#endif
#ifdef SYS_fstat64
#undef SYS_fstat
#define SYS_fstat SYS_fstat64
#endif
#ifdef SYS_lstat64
#undef SYS_lstat
#define SYS_lstat SYS_lstat64
#endif
#ifdef SYS_statfs64
#undef SYS_statfs
#define SYS_statfs SYS_statfs64
#endif
#ifdef SYS_fstatfs64
#undef SYS_fstatfs
#define SYS_fstatfs SYS_fstatfs64
#endif
#if defined(SYS_newfstatat)
#undef SYS_fstatat
#define SYS_fstatat SYS_newfstatat
#elif defined(SYS_fstatat64)
#undef SYS_fstatat
#define SYS_fstatat SYS_fstatat64
#endif
#ifdef SYS_ugetrlimit
#undef SYS_getrlimit
#define SYS_getrlimit SYS_ugetrlimit
#endif
#ifdef SYS__newselect
#undef SYS_select
#define SYS_select SYS__newselect
#endif
#ifdef SYS_pread64
#undef SYS_pread
#undef SYS_pwrite
#define SYS_pread SYS_pread64
#define SYS_pwrite SYS_pwrite64
#endif
#ifdef SYS_fadvise64_64
#undef SYS_fadvise
#define SYS_fadvise SYS_fadvise64_64
#elif defined(SYS_fadvise64)
#undef SYS_fadvise
#define SYS_fadvise SYS_fadvise64
#endif
#ifdef SYS_sendfile64
#undef SYS_sendfile
#define SYS_sendfile SYS_sendfile64
#endif
#ifdef SYS_timer_settime32
#define SYS_timer_settime SYS_timer_settime32
#endif
#ifdef SYS_timer_gettime32
#define SYS_timer_gettime SYS_timer_gettime32
#endif
#ifdef SYS_timerfd_settime32
#define SYS_timerfd_settime SYS_timerfd_settime32
#endif
#ifdef SYS_timerfd_gettime32
#define SYS_timerfd_gettime SYS_timerfd_gettime32
#endif
#ifdef SYS_clock_settime32
#define SYS_clock_settime SYS_clock_settime32
#endif
#ifdef SYS_clock_gettime32
#define SYS_clock_gettime SYS_clock_gettime32
#endif
#ifdef SYS_clock_getres_time32
#define SYS_clock_getres SYS_clock_getres_time32
#endif
#ifdef SYS_clock_nanosleep_time32
#define SYS_clock_nanosleep SYS_clock_nanosleep_time32
#endif
#ifdef SYS_gettimeofday_time32
#define SYS_gettimeofday SYS_gettimeofday_time32
#endif
#ifdef SYS_settimeofday_time32
#define SYS_settimeofday SYS_settimeofday_time32
#endif
/* Ensure that the plain syscall names are defined even for "time64-only"
* archs. These facilitate callers passing null time arguments, and make
* tests for establishing which to use/fallback-to more consistent when
* they do need to be called with time arguments. */
#ifndef SYS_clock_gettime
#define SYS_clock_gettime SYS_clock_gettime64
#endif
#ifndef SYS_clock_settime
#define SYS_clock_settime SYS_clock_settime64
#endif
#ifndef SYS_clock_adjtime
#define SYS_clock_adjtime SYS_clock_adjtime64
#endif
#ifndef SYS_clock_getres
#define SYS_clock_getres SYS_clock_getres_time64
#endif
#ifndef SYS_clock_nanosleep
#define SYS_clock_nanosleep SYS_clock_nanosleep_time64
#endif
#ifndef SYS_timer_gettime
#define SYS_timer_gettime SYS_timer_gettime64
#endif
#ifndef SYS_timer_settime
#define SYS_timer_settime SYS_timer_settime64
#endif
#ifndef SYS_timerfd_gettime
#define SYS_timerfd_gettime SYS_timerfd_gettime64
#endif
#ifndef SYS_timerfd_settime
#define SYS_timerfd_settime SYS_timerfd_settime64
#endif
#ifndef SYS_utimensat
#define SYS_utimensat SYS_utimensat_time64
#endif
#ifndef SYS_pselect6
#define SYS_pselect6 SYS_pselect6_time64
#endif
#ifndef SYS_ppoll
#define SYS_ppoll SYS_ppoll_time64
#endif
#ifndef SYS_recvmmsg
#define SYS_recvmmsg SYS_recvmmsg_time64
#endif
#ifndef SYS_mq_timedsend
#define SYS_mq_timedsend SYS_mq_timedsend_time64
#endif
#ifndef SYS_mq_timedreceive
#define SYS_mq_timedreceive SYS_mq_timedreceive_time64
#endif
/* SYS_semtimedop omitted because SYS_ipc may provide it */
#ifndef SYS_rt_sigtimedwait
#define SYS_rt_sigtimedwait SYS_rt_sigtimedwait_time64
#endif
#ifndef SYS_futex
#define SYS_futex SYS_futex_time64
#endif
#ifndef SYS_sched_rr_get_interval
#define SYS_sched_rr_get_interval SYS_sched_rr_get_interval_time64
#endif
/* socketcall calls */
#define __SC_socket 1
#define __SC_bind 2
#define __SC_connect 3
#define __SC_listen 4
#define __SC_accept 5
#define __SC_getsockname 6
#define __SC_getpeername 7
#define __SC_socketpair 8
#define __SC_send 9
#define __SC_recv 10
#define __SC_sendto 11
#define __SC_recvfrom 12
#define __SC_shutdown 13
#define __SC_setsockopt 14
#define __SC_getsockopt 15
#define __SC_sendmsg 16
#define __SC_recvmsg 17
#define __SC_accept4 18
#define __SC_recvmmsg 19
#define __SC_sendmmsg 20
/* This is valid only because all socket syscalls are made via
* socketcall, which always fills unused argument slots with zeros. */
#ifndef SYS_accept
#define SYS_accept SYS_accept4
#endif
#ifndef SO_RCVTIMEO_OLD
#define SO_RCVTIMEO_OLD 20
#endif
#ifndef SO_SNDTIMEO_OLD
#define SO_SNDTIMEO_OLD 21
#endif
#define SO_TIMESTAMP_OLD 29
#define SO_TIMESTAMPNS_OLD 35
#define SO_TIMESTAMPING_OLD 37
#define SCM_TIMESTAMP_OLD SO_TIMESTAMP_OLD
#define SCM_TIMESTAMPNS_OLD SO_TIMESTAMPNS_OLD
#define SCM_TIMESTAMPING_OLD SO_TIMESTAMPING_OLD
#ifndef SIOCGSTAMP_OLD
#define SIOCGSTAMP_OLD 0x8906
#endif
#ifndef SIOCGSTAMPNS_OLD
#define SIOCGSTAMPNS_OLD 0x8907
#endif
#ifdef SYS_open
#define __sys_open2(x,pn,fl) __syscall2(SYS_open, pn, (fl)|O_LARGEFILE)
#define __sys_open3(x,pn,fl,mo) __syscall3(SYS_open, pn, (fl)|O_LARGEFILE, mo)
#define __sys_open_cp2(x,pn,fl) __syscall_cp2(SYS_open, pn, (fl)|O_LARGEFILE)
#define __sys_open_cp3(x,pn,fl,mo) __syscall_cp3(SYS_open, pn, (fl)|O_LARGEFILE, mo)
#else
#define __sys_open2(x,pn,fl) __syscall3(SYS_openat, AT_FDCWD, pn, (fl)|O_LARGEFILE)
#define __sys_open3(x,pn,fl,mo) __syscall4(SYS_openat, AT_FDCWD, pn, (fl)|O_LARGEFILE, mo)
#define __sys_open_cp2(x,pn,fl) __syscall_cp3(SYS_openat, AT_FDCWD, pn, (fl)|O_LARGEFILE)
#define __sys_open_cp3(x,pn,fl,mo) __syscall_cp4(SYS_openat, AT_FDCWD, pn, (fl)|O_LARGEFILE, mo)
#endif
#define __sys_open(...) __SYSCALL_DISP(__sys_open,,__VA_ARGS__)
#define sys_open(...) __syscall_ret(__sys_open(__VA_ARGS__))
#define __sys_open_cp(...) __SYSCALL_DISP(__sys_open_cp,,__VA_ARGS__)
#define sys_open_cp(...) __syscall_ret(__sys_open_cp(__VA_ARGS__))
#ifdef SYS_wait4
#define __sys_wait4(a,b,c,d) __syscall(SYS_wait4,a,b,c,d)
#define __sys_wait4_cp(a,b,c,d) __syscall_cp(SYS_wait4,a,b,c,d)
#else
hidden long __emulate_wait4(int, int *, int, void *, int);
#define __sys_wait4(a,b,c,d) __emulate_wait4(a,b,c,d,0)
#define __sys_wait4_cp(a,b,c,d) __emulate_wait4(a,b,c,d,1)
#endif
#define sys_wait4(a,b,c,d) __syscall_ret(__sys_wait4(a,b,c,d))
#define sys_wait4_cp(a,b,c,d) __syscall_ret(__sys_wait4_cp(a,b,c,d))
hidden void __procfdname(char __buf[static 15+3*sizeof(int)], unsigned);
hidden void *__vdsosym(const char *, const char *);
#endif
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