diff options
Diffstat (limited to 'kernel/cpu/syscall.c')
| -rw-r--r-- | kernel/cpu/syscall.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/kernel/cpu/syscall.c b/kernel/cpu/syscall.c new file mode 100644 index 0000000..4978732 --- /dev/null +++ b/kernel/cpu/syscall.c @@ -0,0 +1,183 @@ +// 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 <scalls/accept.h> +#include <scalls/bind.h> +#include <scalls/ftruncate.h> +#include <scalls/kill.h> +#include <scalls/mkdir.h> +#include <scalls/mmap.h> +#include <scalls/msleep.h> +#include <scalls/ppoll.h> +#include <scalls/recvfrom.h> +#include <scalls/sendto.h> +#include <scalls/shm.h> +#include <scalls/socket.h> +#include <scalls/stat.h> +#include <scalls/uptime.h> +#include <scalls/sigaction.h> +#include <stdint.h> +#include <string.h> + +#pragma GCC diagnostic ignored "-Wpedantic" + +int syscall_open(SYS_OPEN_PARAMS *args) { + char file[256]; + strcpy(file, args->file); + // const char *file = copy_and_allocate_user_string(args->file); + int flags = args->flags; + int mode = args->mode; + int rc = vfs_open(file, flags, mode); + // kfree((void *)file); + return rc; +} + +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) { + if (!get_vfs_fd(args->fd)) + return -EBADF; + int rc = vfs_pread(args->fd, args->buf, args->count, + get_current_task()->file_descriptors[args->fd]->offset); + get_current_task()->file_descriptors[args->fd]->offset += rc; + return rc; +} + +int syscall_pwrite(SYS_PWRITE_PARAMS *args) { + return vfs_pwrite(args->fd, args->buf, args->count, args->offset); +} + +int syscall_write(int fd, const char *buf, size_t count) { + if (!get_vfs_fd(fd)) + return -EBADF; + int rc = vfs_pwrite(fd, (char *)buf, count, + get_current_task()->file_descriptors[fd]->offset); + get_current_task()->file_descriptors[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_function_handler(uint32_t eax, uint32_t arg1, uint32_t arg2, + uint32_t arg3, uint32_t arg4, uint32_t 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); +} |