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Kernel: add default signal actions

This commit is contained in:
Bananymous 2023-07-21 18:02:35 +03:00
parent 5f2549b198
commit 217e5f81cc
3 changed files with 74 additions and 15 deletions
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6
kernel/arch/x86_64/Signal.S
View File

@ -43,9 +43,3 @@ signal_trampoline:
addq $16, %rsp
ret
.global test_signal
test_signal:
movq $99, %rax
int $0x80
ret

4
kernel/include/kernel/Process.h
View File

@ -158,6 +158,10 @@ namespace Kernel
userspace_info_t m_userspace_info;
ExitStatus m_exit_status;
vaddr_t m_signal_handlers[_SIGMAX + 1] { };
uint64_t m_signal_mask { (1ull << SIGCHLD) | (1ull << SIGURG) };
static_assert(_SIGMAX < 64);
BAN::UniqPtr<PageTable> m_page_table;
BAN::RefPtr<TTY> m_tty;
};

79
kernel/kernel/Process.cpp
View File

@ -7,6 +7,7 @@
#include <kernel/Memory/PageTableScope.h>
#include <kernel/Process.h>
#include <kernel/Scheduler.h>
#include <kernel/Signal.h>
#include <LibELF/ELF.h>
#include <LibELF/Values.h>
@ -15,7 +16,6 @@
#include <sys/sysmacros.h>
extern "C" void signal_trampoline();
extern "C" void test_signal();
namespace Kernel
{
@ -795,19 +795,80 @@ namespace Kernel
{
if (signal < _SIGMIN || signal > _SIGMAX)
return BAN::Error::from_errno(EINVAL);
ASSERT(&Process::current() == this);
// Skip masked (ignored) signals
if (m_signal_mask & (1ull << signal))
return 0;
LockGuard lock_guard(m_lock);
asm volatile("cli");
if (m_signal_handlers[signal])
{
asm volatile("cli");
uintptr_t* return_rsp_ptr = (uintptr_t*)return_rsp;
*--return_rsp_ptr = return_rip;
*--return_rsp_ptr = signal;
*--return_rsp_ptr = (uintptr_t)test_signal;
uintptr_t* return_rsp_ptr = (uintptr_t*)return_rsp;
*--return_rsp_ptr = return_rip;
*--return_rsp_ptr = signal;
*--return_rsp_ptr = m_signal_handlers[signal];
return_rsp = (uintptr_t)return_rsp_ptr;
return_rip = (uintptr_t)signal_trampoline;
return_rsp = (uintptr_t)return_rsp_ptr;
return_rip = (uintptr_t)signal_trampoline;
}
else
{
switch (signal)
{
// Abnormal termination of the process with additional actions.
case SIGABRT:
case SIGBUS:
case SIGFPE:
case SIGILL:
case SIGQUIT:
case SIGSEGV:
case SIGSYS:
case SIGTRAP:
case SIGXCPU:
case SIGXFSZ:
// TODO: additional actions
// fall through
// Abnormal termination of the process
case SIGALRM:
case SIGHUP:
case SIGINT:
case SIGKILL:
case SIGPIPE:
case SIGTERM:
case SIGUSR1:
case SIGUSR2:
case SIGPOLL:
case SIGPROF:
case SIGVTALRM:
{
auto message = BAN::String::formatted("killed by signal {}\n", signal);
(void)m_tty->write(0, message.data(), message.size());
lock_guard.~LockGuard();
exit(128 + signal);
ASSERT_NOT_REACHED();
}
// Ignore the signal
case SIGCHLD:
case SIGURG:
break;
// Stop the process:
case SIGTSTP:
case SIGTTIN:
case SIGTTOU:
ASSERT_NOT_REACHED();
// Continue the process, if it is stopped; otherwise, ignore the signal.
case SIGCONT:
ASSERT_NOT_REACHED();
}
}
return 0;
}