Initial commit: Schunix as it stands before the SchOS rename
An x86-64 operating system built from xv6, now largely rewritten: SMP, a copy-on-write root filesystem (SchFS), PCI/USB/virtio drivers, a TTF rasteriser, and a Linux-numbered syscall ABI. No history before this point -- the tree was never under version control. This commit exists so the rename that follows has something to undo to.
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Nexoniarz
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275 changed files with 51417 additions and 0 deletions
162
kernel/sys/sys_compat.c
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162
kernel/sys/sys_compat.c
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// POSIX / Linux-ABI compatibility syscalls.
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// These are stubs or thin wrappers that make musl and ksh happy
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// without implementing full semantics.
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#include "types.h"
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#include "defs.h"
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#include "param.h"
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#include "memlayout.h"
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#include "mmu.h"
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#include "traps.h"
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#include "proc.h"
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#include "x86.h"
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#include "syscall.h"
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#include "posix.h"
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#include "uaccess.h"
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#include "errno.h"
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extern int linux_syscall_map[];
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extern int linux_syscall_map_size;
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// enable_linux_abi: switch this process to Linux syscall numbering.
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addr_t
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sys_enable_linux_abi(void)
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{
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myproc()->syscall_map = linux_syscall_map;
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myproc()->map_size = linux_syscall_map_size;
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return 0;
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}
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// set_tid_address: musl calls this at startup to register its TID location.
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addr_t
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sys_set_tid_address(void)
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{
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addr_t tidp;
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argaddr(0, &tidp);
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if (tidp)
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put_user(myproc()->pid, tidp);
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return myproc()->pid;
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}
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// set_robust_list: robust mutex cleanup on exit — stub.
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addr_t sys_set_robust_list(void) { return 0; }
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// futex: used by musl for single-threaded lock primitives.
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addr_t
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sys_futex(void)
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{
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int op;
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argint(1, &op);
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op &= ~(FUTEX_WAIT_PRIVATE - FUTEX_WAIT);
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if (op == FUTEX_WAKE || op == FUTEX_WAKE_PRIVATE)
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return 0;
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return -EAGAIN; // no blocking, musl retries
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}
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// arch_prctl: save FS_BASE for TLS.
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addr_t
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sys_arch_prctl(void)
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{
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int code;
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addr_t addr;
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argint(0, &code);
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argaddr(1, &addr);
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if (code == ARCH_SET_FS) {
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myproc()->fs_base = addr;
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return 0;
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}
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if (code == ARCH_GET_FS) {
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if (put_user(myproc()->fs_base, addr) < 0)
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return -EFAULT;
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return 0;
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}
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return -EINVAL;
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}
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addr_t
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sys_getrlimit(void)
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{
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int resource;
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struct rlimit *rlp;
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argint(0, &resource);
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if (argptr(1, (char**)&rlp, sizeof(*rlp)) < 0)
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return -1;
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rlp->rlim_cur = (uint64)-1;
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rlp->rlim_max = (uint64)-1;
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return 0;
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}
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addr_t
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sys_prlimit(void)
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{
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struct rlimit *oldrlp;
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if (argptr(3, (char**)&oldrlp, sizeof(*oldrlp)) == 0 && oldrlp) {
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oldrlp->rlim_cur = (uint64)-1;
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oldrlp->rlim_max = (uint64)-1;
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}
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return 0;
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}
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// uname: return fake but plausible kernel/host info
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addr_t
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sys_uname(void)
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{
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struct utsname {
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char sysname[65];
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char nodename[65];
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char release[65];
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char version[65];
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char machine[65];
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char domainname[65];
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};
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addr_t ubuf;
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argaddr(0, &ubuf);
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struct utsname *u = (struct utsname*)user_ptr(ubuf, sizeof(*u));
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if (!u) return -EFAULT;
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memset(u, 0, sizeof(*u));
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memmove(u->sysname, "Schunix", 8);
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memmove(u->nodename, "schunix", 8);
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memmove(u->release, "0.1.0", 6);
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memmove(u->version, "#1", 3);
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memmove(u->machine, "x86_64", 7);
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memmove(u->domainname, "(none)", 7);
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return 0;
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}
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// socket/bind/listen/accept/connect live in sys_net.c now that they do
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// something.
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// syslog: kernel logging facility — no-op for user processes.
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addr_t sys_syslog(void) { return 0; }
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// getrandom: fill buffer with pseudo-random bytes.
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addr_t sys_getrandom(void)
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{
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addr_t bufaddr;
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int len, flags;
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argaddr(0, &bufaddr); argint(1, &len); argint(2, &flags);
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if (len <= 0) return 0;
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uint8 *buf = (uint8*)user_ptr(bufaddr, (uint64)len);
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if (!buf) return -EFAULT;
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// LCG seeded from proc pointer + pid; no lock needed (read-only fields).
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uint rseed = (uint)(uintptr_t)myproc() ^ (uint)myproc()->pid;
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for (int i = 0; i < len; i++) {
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rseed = rseed * 1664525u + 1013904223u;
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buf[i] = (uint8)(rseed >> 16);
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}
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return len;
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}
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// pselect6 / ppoll live in sys_poll.c alongside select/poll.
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// epoll: not implemented.
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addr_t sys_epoll_create1(void) { return -ENOSYS; }
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addr_t sys_epoll_ctl(void) { return -ENOSYS; }
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addr_t sys_epoll_wait(void) { return -ENOSYS; }
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// signalfd / eventfd / timerfd: not implemented.
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addr_t sys_signalfd4(void) { return -ENOSYS; }
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addr_t sys_eventfd2(void) { return -ENOSYS; }
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addr_t sys_timerfd_create(void) { return -ENOSYS; }
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addr_t sys_timerfd_settime(void){ return -ENOSYS; }
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addr_t sys_timerfd_gettime(void){ return -ENOSYS; }
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