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#include "sys/syscall.h"
#include "arch/x86_64/hal/obj.h"
#include "hal/smp.h"
#include "hal/process.h"
#include "jove.h"
#include "lib/printf.h"
#include "sys/message.h"
int
_syscall_handle_generic(
jove_owned_obj_t *pcb_obj,
jove_owned_obj_t *objdir,
jove_owned_obj_t *message_obj,
jove_owned_obj_t *target_obj,
struct syscall_header *header,
size_t bytes_left,
void *payload)
{
pcb_t *pcb = obj_deref(pcb_obj);
kprintf("syscall: Process %i encountered stub syscall on object %P\n", pcb_pid(pcb), header->path, header->pathlen);
return EBADOBJ;
}
static const syscall_handle_t s_syscall_handles[128] = {
[JOVE_OBJ_NONE] = NULL,
[JOVE_OBJ_UNTYPED] = _syscall_handle_generic,
[JOVE_OBJ_OBJDIR] = _syscall_handle_generic,
[JOVE_OBJ_PAGEDIR] = _syscall_handle_generic,
[JOVE_OBJ_PROCESSOR] = _syscall_handle_generic,
[JOVE_OBJ_PROCESS] = _syscall_handle_generic,
[JOVE_OBJ_PAGEFRAME] = _syscall_handle_generic,
[JOVE_OBJ_INITRD_FILE] = _syscall_handle_generic,
[JOVE_OBJ_FRAMEBUFFER] = _syscall_handle_generic,
[JOVE_OBJ_VIRTTERM] = _syscall_handle_generic,
[JOVE_OBJ_MESSAGE] = _syscall_handle_generic,
};
int
syscall_handler(uintmax_t message_path_raw, uint16_t message_pathlen)
{
uint16_t *message_path = (uint16_t*)&message_path_raw;
if(message_pathlen > sizeof(uintmax_t) >> 1) {
return EBADPATH;
}
jove_owned_obj_t *pcb_obj = process_current();
pcb_t *pcb = obj_deref(pcb_obj);
jove_owned_obj_t *objdir = pcb_rootdir(pcb);
kprintf("Syscall: %p : %P \n", objdir, message_path, message_pathlen);
jove_owned_obj_t *message_obj = objdir_getobj(objdir, message_path, message_pathlen);
if(message_obj == 0) {
obj_release(objdir);
obj_release(pcb_obj);
return errno;
}
#define SYSCALL_MIDWAY_CLEANUP \
obj_release(message_obj); \
obj_release(objdir); \
obj_release(pcb_obj)
if(obj_gettype(message_obj) != JOVE_OBJ_MESSAGE) {
kprintf("syscall: Process %i tried to call syscall with invalid object: %P\n", pcb_pid(pcb), message_path, message_pathlen);
SYSCALL_MIDWAY_CLEANUP;
return EBADOBJ;
}
size_t messagelen = message_len(message_obj);
void *messagedata = message_data(message_obj);
struct syscall_header *header = messagedata;
size_t header_bytes = sizeof(struct syscall_header) + header->pathlen * 2;
int bytes_left = messagelen - header_bytes;
kprintf("syscall: Payload %p len %i\n", messagedata, header->pathlen);
if(bytes_left < 0) {
//Target path exceeds message length.
kprintf("syscall: Process %i tried to call syscall with OOB target path.\n", pcb_pid(pcb));
SYSCALL_MIDWAY_CLEANUP;
return EBADPATH;
}
jove_owned_obj_t *target = objdir_getobj(objdir, header->path, header->pathlen);
if(target == 0) {
//Could not find payload target in pcb rootdir.
kprintf("syscall: Process %i tried to call syscall with bad target path %P\n",
pcb_pid(pcb), header->path, header->pathlen);
SYSCALL_MIDWAY_CLEANUP;
return errno;
}
int sysret = 0;
uint8_t target_type = obj_gettype(target);
if(target_type > 0x7F) {
sysret = syscall_handle_arch(pcb_obj, objdir, message_obj, target,
header, bytes_left, messagedata + header_bytes);
}else{
syscall_handle_t call_handle = s_syscall_handles[obj_gettype(target)];
if(call_handle == NULL) {
kprintf("syscall: Process %i tried to call syscall on object %P which doesn't support syscalls!\n",
pcb_pid(pcb), header->path, header->pathlen);
sysret = EBADOBJ;
}else
sysret = call_handle(pcb_obj, objdir, message_obj, target,
header, bytes_left, message_data + header_bytes);
}
obj_release(target);
SYSCALL_MIDWAY_CLEANUP;
return sysret;
}
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