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// FIXME: Make sure that the args variabel actually points to something
// valid.
#include <assert.h>
#include <cpu/syscall.h>
#include <drivers/pst.h>
#include <errno.h>
#include <fs/tmpfs.h>
#include <fs/vfs.h>
#include <kmalloc.h>
#include <string.h>
#include <syscalls.h>
#include <typedefs.h>
#pragma GCC diagnostic ignored "-Wpedantic"
int syscall_exec(SYS_EXEC_PARAMS *args) {
const char *filename = copy_and_allocate_user_string(args->path);
int argc = 0;
for (; args->argv[argc];) {
argc++;
}
char **new_argv = kallocarray(argc + 1, sizeof(char *));
for (int i = 0; i < argc; i++)
new_argv[i] = copy_and_allocate_user_string(args->argv[i]);
new_argv[argc] = NULL;
exec(filename, new_argv);
kfree((void *)filename);
for (int i = 0; i < argc; i++)
kfree(new_argv[i]);
kfree(new_argv);
return -1;
}
int syscall_pipe(int fd[2]) {
pipe(fd); // FIXME: Error checking
return 0;
}
int syscall_pread(SYS_PREAD_PARAMS *args) {
return vfs_pread(args->fd, args->buf, args->count, args->offset);
}
int syscall_read(SYS_READ_PARAMS *args) {
vfs_fd_t *fd = get_vfs_fd(args->fd);
if (!fd)
return -EBADF;
int rc = vfs_pread(args->fd, args->buf, args->count, fd->offset);
fd->offset += rc;
return rc;
}
int syscall_dup2(SYS_DUP2_PARAMS *args) {
return vfs_dup2(args->org_fd, args->new_fd);
}
void syscall_exit(int status) {
exit(status);
assert(0);
}
void syscall_wait(int *status) {
asm("cli");
if (!get_current_task()->child) {
if (status)
*status = -1;
return;
}
if (get_current_task()->child->dead) {
if (status)
*status = get_current_task()->child_rc;
return;
}
get_current_task()->halts[WAIT_CHILD_HALT] = 1;
switch_task();
if (status)
*status = get_current_task()->child_rc;
}
int syscall_fork(void) { return fork(); }
int syscall_getpid(void) { return get_current_task()->pid; }
void *align_page(void *a);
int syscall_brk(void *addr) {
void *end = get_current_task()->data_segment_end;
if (!mmu_allocate_region(end, addr - end, MMU_FLAG_RW, NULL))
return -ENOMEM;
get_current_task()->data_segment_end = align_page(addr);
return 0;
}
void *syscall_sbrk(uintptr_t increment) {
asm("cli");
void *rc = get_current_task()->data_segment_end;
void *n =
(void *)((uintptr_t)(get_current_task()->data_segment_end) + increment);
int rc2;
if (0 > (rc2 = syscall_brk(n)))
return (void *)rc2;
return rc;
}
int syscall_close(int fd) { return vfs_close(fd); }
int syscall_openpty(SYS_OPENPTY_PARAMS *args) {
assert(is_valid_userpointer(args, sizeof(SYS_OPENPTY_PARAMS)));
return openpty(args->amaster, args->aslave, args->name, args->termp,
args->winp);
}
void (*syscall_functions[])() = {
(void(*))syscall_open, (void(*))syscall_read,
(void(*))syscall_write, (void(*))syscall_pread,
(void(*))syscall_pwrite, (void(*))syscall_fork,
(void(*))syscall_exec, (void(*))syscall_getpid,
(void(*))syscall_exit, (void(*))syscall_wait,
(void(*))syscall_brk, (void(*))syscall_sbrk,
(void(*))syscall_pipe, (void(*))syscall_dup2,
(void(*))syscall_close, (void(*))syscall_openpty,
(void(*))syscall_poll, (void(*))syscall_mmap,
(void(*))syscall_accept, (void(*))syscall_bind,
(void(*))syscall_socket, (void(*))syscall_shm_open,
(void(*))syscall_ftruncate, (void(*))syscall_stat,
(void(*))syscall_msleep, (void(*))syscall_uptime,
(void(*))syscall_mkdir, (void(*))syscall_recvfrom,
(void(*))syscall_sendto, (void(*))syscall_kill,
(void(*))syscall_sigaction, (void(*))syscall_chdir,
(void(*))syscall_getcwd, (void(*))syscall_isatty,
(void(*))syscall_randomfill,
};
void syscall_function_handler(u32 eax, u32 arg1, u32 arg2, u32 arg3, u32 arg4,
u32 arg5) {
assert(eax < sizeof(syscall_functions) / sizeof(syscall_functions[0]));
syscall_functions[eax](arg1, arg2, arg3, arg4, arg5);
}
extern void int_syscall(void);
void syscalls_init(void) {
install_handler(int_syscall, INT_32_INTERRUPT_GATE(0x3), 0x80);
}
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