/*
* Execute a 32-bit system call on behalf of the current thread.
*/
void
dosyscall(void)
{
/*
* Need space on the stack to store syscall arguments.
*/
long syscall_args[MAXSYSARGS];
struct sysent *se;
int64_t ret;
syscall_mstate(LMS_TRAP, LMS_SYSTEM);
ASSERT(curproc->p_model == DATAMODEL_ILP32);
CPU_STATS_ENTER_K();
CPU_STATS_ADDQ(CPU, sys, syscall, 1);
CPU_STATS_EXIT_K();
se = syscall_entry(curthread, syscall_args);
/*
* syscall_entry() copied all 8 arguments into syscall_args.
*/
ret = se->sy_callc(syscall_args[0], syscall_args[1], syscall_args[2],
syscall_args[3], syscall_args[4], syscall_args[5], syscall_args[6],
syscall_args[7]);
syscall_exit(curthread, (int)ret & 0xffffffffu, (int)(ret >> 32));
syscall_mstate(LMS_SYSTEM, LMS_TRAP);
}
/**
* Handle system calls. Interrupts are enabled when this function is
* called.
*
* @param user_context The userland context (CPU registers as they
* where when system call instruction was called in userland)
*/
void syscall_handle(regs_t *registers)
{
/* When a syscall is executed in userland, register rdi contains
* the number of the syscall. Registers rsi, rdx and rcx contain the
* arguments of the syscall. The userland code expects that after
* returning from the syscall instruction the return value of the
* syscall is found in register rax. Before entering this function
* the userland context has been saved to user_context and after
* returning from this function the userland context will be
* restored from user_context.
*/
registers->rax = syscall_entry(registers->rdi, registers->rsi,
registers->rdx, registers->rcx);
}
