LadybirdBrowser/ladybird
1
1
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2024-09-20 09:49:15 +03:00
Code Issues Packages Projects Releases Wiki Activity
77cf607cda
ladybird/Kernel/Syscall.h
Andreas Kling 77cf607cda Kernel+LibC: Publish a "kernel info page" and use it for gettimeofday() 
This patch adds a single "kernel info page" that is mappable read-only
by any process and contains the current time of day.

This is then used to implement a version of gettimeofday() that doesn't
have to make a syscall.

To protect against race condition issues, the info page also has a
serial number which is incremented whenever the kernel updates the
contents of the page. Make sure to verify that the serial number is the
same before and after reading the information you want from the page.
2019-12-15 21:29:26 +01:00

333 lines
12 KiB
C++
Raw Blame History

#pragma once
#include <AK/Types.h>
#ifdef __serenity__
# include <LibC/fd_set.h>
#endif
extern "C" {
struct timeval;
struct timespec;
struct sockaddr;
typedef u32 socklen_t;
}
#define ENUMERATE_SYSCALLS \
__ENUMERATE_SYSCALL(sleep) \
__ENUMERATE_SYSCALL(yield) \
__ENUMERATE_SYSCALL(putch) \
__ENUMERATE_SYSCALL(open) \
__ENUMERATE_SYSCALL(close) \
__ENUMERATE_SYSCALL(read) \
__ENUMERATE_SYSCALL(lseek) \
__ENUMERATE_SYSCALL(kill) \
__ENUMERATE_SYSCALL(getuid) \
__ENUMERATE_SYSCALL(exit) \
__ENUMERATE_SYSCALL(getgid) \
__ENUMERATE_SYSCALL(getpid) \
__ENUMERATE_SYSCALL(waitpid) \
__ENUMERATE_SYSCALL(mmap) \
__ENUMERATE_SYSCALL(munmap) \
__ENUMERATE_SYSCALL(get_dir_entries) \
__ENUMERATE_SYSCALL(lstat) \
__ENUMERATE_SYSCALL(getcwd) \
__ENUMERATE_SYSCALL(gettimeofday) \
__ENUMERATE_SYSCALL(gethostname) \
__ENUMERATE_SYSCALL(chdir) \
__ENUMERATE_SYSCALL(uname) \
__ENUMERATE_SYSCALL(set_mmap_name) \
__ENUMERATE_SYSCALL(readlink) \
__ENUMERATE_SYSCALL(write) \
__ENUMERATE_SYSCALL(ttyname_r) \
__ENUMERATE_SYSCALL(stat) \
__ENUMERATE_SYSCALL(getsid) \
__ENUMERATE_SYSCALL(setsid) \
__ENUMERATE_SYSCALL(getpgid) \
__ENUMERATE_SYSCALL(setpgid) \
__ENUMERATE_SYSCALL(getpgrp) \
__ENUMERATE_SYSCALL(fork) \
__ENUMERATE_SYSCALL(execve) \
__ENUMERATE_SYSCALL(geteuid) \
__ENUMERATE_SYSCALL(getegid) \
__ENUMERATE_REMOVED_SYSCALL(isatty) \
__ENUMERATE_SYSCALL(getdtablesize) \
__ENUMERATE_SYSCALL(dup) \
__ENUMERATE_SYSCALL(dup2) \
__ENUMERATE_SYSCALL(sigaction) \
__ENUMERATE_SYSCALL(getppid) \
__ENUMERATE_SYSCALL(umask) \
__ENUMERATE_SYSCALL(getgroups) \
__ENUMERATE_SYSCALL(setgroups) \
__ENUMERATE_SYSCALL(sigreturn) \
__ENUMERATE_SYSCALL(sigprocmask) \
__ENUMERATE_SYSCALL(sigpending) \
__ENUMERATE_SYSCALL(pipe) \
__ENUMERATE_SYSCALL(killpg) \
__ENUMERATE_SYSCALL(setuid) \
__ENUMERATE_SYSCALL(setgid) \
__ENUMERATE_SYSCALL(alarm) \
__ENUMERATE_SYSCALL(fstat) \
__ENUMERATE_SYSCALL(access) \
__ENUMERATE_SYSCALL(fcntl) \
__ENUMERATE_SYSCALL(ioctl) \
__ENUMERATE_SYSCALL(mkdir) \
__ENUMERATE_SYSCALL(times) \
__ENUMERATE_SYSCALL(utime) \
__ENUMERATE_SYSCALL(sync) \
__ENUMERATE_SYSCALL(ptsname_r) \
__ENUMERATE_SYSCALL(select) \
__ENUMERATE_SYSCALL(unlink) \
__ENUMERATE_SYSCALL(poll) \
__ENUMERATE_SYSCALL(read_tsc) \
__ENUMERATE_SYSCALL(rmdir) \
__ENUMERATE_SYSCALL(chmod) \
__ENUMERATE_SYSCALL(usleep) \
__ENUMERATE_SYSCALL(socket) \
__ENUMERATE_SYSCALL(bind) \
__ENUMERATE_SYSCALL(accept) \
__ENUMERATE_SYSCALL(listen) \
__ENUMERATE_SYSCALL(connect) \
__ENUMERATE_SYSCALL(create_shared_buffer) \
__ENUMERATE_SYSCALL(share_buffer_with) \
__ENUMERATE_SYSCALL(get_shared_buffer) \
__ENUMERATE_SYSCALL(release_shared_buffer) \
__ENUMERATE_SYSCALL(link) \
__ENUMERATE_SYSCALL(chown) \
__ENUMERATE_SYSCALL(fchmod) \
__ENUMERATE_SYSCALL(symlink) \
__ENUMERATE_SYSCALL(restore_signal_mask) \
__ENUMERATE_SYSCALL(get_shared_buffer_size) \
__ENUMERATE_SYSCALL(seal_shared_buffer) \
__ENUMERATE_SYSCALL(sendto) \
__ENUMERATE_SYSCALL(recvfrom) \
__ENUMERATE_SYSCALL(getsockopt) \
__ENUMERATE_SYSCALL(setsockopt) \
__ENUMERATE_SYSCALL(create_thread) \
__ENUMERATE_SYSCALL(gettid) \
__ENUMERATE_SYSCALL(donate) \
__ENUMERATE_SYSCALL(rename) \
__ENUMERATE_SYSCALL(shm_open) \
__ENUMERATE_SYSCALL(shm_unlink) \
__ENUMERATE_SYSCALL(ftruncate) \
__ENUMERATE_SYSCALL(systrace) \
__ENUMERATE_SYSCALL(exit_thread) \
__ENUMERATE_SYSCALL(mknod) \
__ENUMERATE_SYSCALL(writev) \
__ENUMERATE_SYSCALL(beep) \
__ENUMERATE_SYSCALL(getsockname) \
__ENUMERATE_SYSCALL(getpeername) \
__ENUMERATE_SYSCALL(sched_setparam) \
__ENUMERATE_SYSCALL(sched_getparam) \
__ENUMERATE_SYSCALL(fchown) \
__ENUMERATE_SYSCALL(halt) \
__ENUMERATE_SYSCALL(reboot) \
__ENUMERATE_SYSCALL(mount) \
__ENUMERATE_SYSCALL(umount) \
__ENUMERATE_SYSCALL(dump_backtrace) \
__ENUMERATE_SYSCALL(dbgputch) \
__ENUMERATE_SYSCALL(dbgputstr) \
__ENUMERATE_SYSCALL(watch_file) \
__ENUMERATE_SYSCALL(share_buffer_globally) \
__ENUMERATE_SYSCALL(set_process_icon) \
__ENUMERATE_SYSCALL(mprotect) \
__ENUMERATE_SYSCALL(realpath) \
__ENUMERATE_SYSCALL(get_process_name) \
__ENUMERATE_SYSCALL(fchdir) \
__ENUMERATE_SYSCALL(getrandom) \
__ENUMERATE_SYSCALL(setkeymap) \
__ENUMERATE_SYSCALL(clock_gettime) \
__ENUMERATE_SYSCALL(clock_nanosleep) \
__ENUMERATE_SYSCALL(openat) \
__ENUMERATE_SYSCALL(join_thread) \
__ENUMERATE_SYSCALL(module_load) \
__ENUMERATE_SYSCALL(module_unload) \
__ENUMERATE_SYSCALL(detach_thread) \
__ENUMERATE_SYSCALL(set_thread_name) \
__ENUMERATE_SYSCALL(get_thread_name) \
__ENUMERATE_SYSCALL(madvise) \
__ENUMERATE_SYSCALL(purge) \
__ENUMERATE_SYSCALL(set_shared_buffer_volatile) \
__ENUMERATE_SYSCALL(profiling_enable) \
__ENUMERATE_SYSCALL(profiling_disable) \
__ENUMERATE_SYSCALL(get_kernel_info_page)
namespace Syscall {
enum Function {
#undef __ENUMERATE_SYSCALL
#undef __ENUMERATE_REMOVED_SYSCALL
#define __ENUMERATE_REMOVED_SYSCALL(x) SC_##x,
#define __ENUMERATE_SYSCALL(x) SC_##x,
ENUMERATE_SYSCALLS
#undef __ENUMERATE_SYSCALL
#undef __ENUMERATE_REMOVED_SYSCALL
__Count
};
inline constexpr const char* to_string(Function function)
{
switch (function) {
#undef __ENUMERATE_SYSCALL
#undef __ENUMERATE_REMOVED_SYSCALL
#define __ENUMERATE_REMOVED_SYSCALL(x) \
case SC_##x: \
return #x " (removed)";
#define __ENUMERATE_SYSCALL(x) \
case SC_##x: \
return #x;
ENUMERATE_SYSCALLS
#undef __ENUMERATE_SYSCALL
#undef __ENUMERATE_REMOVED_SYSCALL
default:
break;
}
return "Unknown";
}
#ifdef __serenity__
struct SC_mmap_params {
uint32_t addr;
uint32_t size;
int32_t prot;
int32_t flags;
int32_t fd;
int32_t offset; // FIXME: 64-bit off_t?
const char* name { nullptr };
};
struct SC_open_params {
const char* path;
int path_length;
int options;
u16 mode;
};
struct SC_openat_params {
int dirfd;
const char* path;
int path_length;
int options;
u16 mode;
};
struct SC_select_params {
int nfds;
fd_set* readfds;
fd_set* writefds;
fd_set* exceptfds;
struct timeval* timeout;
};
struct SC_clock_nanosleep_params {
int clock_id;
int flags;
const struct timespec* requested_sleep;
struct timespec* remaining_sleep;
};
struct SC_sendto_params {
int sockfd;
const void* data;
size_t data_length;
int flags;
const sockaddr* addr;
socklen_t addr_length;
};
struct SC_recvfrom_params {
int sockfd;
void* buffer;
size_t buffer_length;
int flags;
sockaddr* addr;
socklen_t* addr_length;
};
struct SC_getsockopt_params {
int sockfd;
int level;
int option;
void* value;
socklen_t* value_size;
};
struct SC_setsockopt_params {
int sockfd;
int level;
int option;
const void* value;
socklen_t value_size;
};
struct SC_create_thread_params {
unsigned int m_detach_state = 0; // JOINABLE or DETACHED
int m_schedule_priority = 2; // ThreadPriority::Normal
// FIXME: Implment guard pages in create_thread (unreadable pages at "overflow" end of stack)
// "If an implementation rounds up the value of guardsize to a multiple of {PAGESIZE},
// a call to pthread_attr_getguardsize() specifying attr shall store in the guardsize
// parameter the guard size specified by the previous pthread_attr_setguardsize() function call"
// ... ok, if you say so posix. Guess we get to lie to people about guard page size
unsigned int m_guard_page_size = 0; // Rounded up to PAGE_SIZE
unsigned int m_reported_guard_page_size = 0; // The lie we tell callers
unsigned int m_stack_size = 4 * MB; // Default PTHREAD_STACK_MIN
void* m_stack_location = nullptr; // nullptr means any, o.w. process virtual address
};
void initialize();
int sync();
inline u32 invoke(Function function)
{
u32 result;
asm volatile("int $0x82"
: "=a"(result)
: "a"(function)
: "memory");
return result;
}
template<typename T1>
inline u32 invoke(Function function, T1 arg1)
{
u32 result;
asm volatile("int $0x82"
: "=a"(result)
: "a"(function), "d"((u32)arg1)
: "memory");
return result;
}
template<typename T1, typename T2>
inline u32 invoke(Function function, T1 arg1, T2 arg2)
{
u32 result;
asm volatile("int $0x82"
: "=a"(result)
: "a"(function), "d"((u32)arg1), "c"((u32)arg2)
: "memory");
return result;
}
template<typename T1, typename T2, typename T3>
inline u32 invoke(Function function, T1 arg1, T2 arg2, T3 arg3)
{
u32 result;
asm volatile("int $0x82"
: "=a"(result)
: "a"(function), "d"((u32)arg1), "c"((u32)arg2), "b"((u32)arg3)
: "memory");
return result;
}
#endif
}
#undef __ENUMERATE_SYSCALL
#define __ENUMERATE_SYSCALL(x) using Syscall::SC_##x;
#define __ENUMERATE_REMOVED_SYSCALL(x)
ENUMERATE_SYSCALLS
#undef __ENUMERATE_SYSCALL
#undef __ENUMERATE_REMOVED_SYSCALL
#define syscall Syscall::invoke
Reference in New Issue View Git Blame Copy Permalink