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Kernel+LibSystem: Add a 4th syscall argument

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Let's allow passing 4 function arguments to a syscall. The 4th argument
goes into ESI or RSI.
This commit is contained in:
Andreas Kling 2021-07-24 02:15:07 +02:00
parent 9b78ae5149
commit deff554096
5 changed files with 33 additions and 8 deletions
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15
Kernel/Syscall.cpp
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@ -80,7 +80,7 @@ NEVER_INLINE NAKED void syscall_asm_entry()
namespace Syscall {
static KResultOr<FlatPtr> handle(RegisterState&, FlatPtr function, FlatPtr arg1, FlatPtr arg2, FlatPtr arg3);
static KResultOr<FlatPtr> handle(RegisterState&, FlatPtr function, FlatPtr arg1, FlatPtr arg2, FlatPtr arg3, FlatPtr arg4);
UNMAP_AFTER_INIT void initialize()
{
@ -88,7 +88,7 @@ UNMAP_AFTER_INIT void initialize()
}
#pragma GCC diagnostic ignored "-Wcast-function-type"
typedef KResultOr<FlatPtr> (Process::*Handler)(FlatPtr, FlatPtr, FlatPtr);
typedef KResultOr<FlatPtr> (Process::*Handler)(FlatPtr, FlatPtr, FlatPtr, FlatPtr);
typedef KResultOr<FlatPtr> (Process::*HandlerWithRegisterState)(RegisterState&);
struct HandlerMetadata {
Handler handler;
@ -101,7 +101,7 @@ static const HandlerMetadata s_syscall_table[] = {
};
#undef __ENUMERATE_SYSCALL
KResultOr<FlatPtr> handle(RegisterState& regs, FlatPtr function, FlatPtr arg1, FlatPtr arg2, FlatPtr arg3)
KResultOr<FlatPtr> handle(RegisterState& regs, FlatPtr function, FlatPtr arg1, FlatPtr arg2, FlatPtr arg3, FlatPtr arg4)
{
VERIFY_INTERRUPTS_ENABLED();
auto current_thread = Thread::current();
@ -109,7 +109,7 @@ KResultOr<FlatPtr> handle(RegisterState& regs, FlatPtr function, FlatPtr arg1, F
current_thread->did_syscall();
if (function >= Function::__Count) {
dbgln("Unknown syscall {} requested ({:p}, {:p}, {:p})", function, arg1, arg2, arg3);
dbgln("Unknown syscall {} requested ({:p}, {:p}, {:p}, {:p})", function, arg1, arg2, arg3, arg4);
return ENOSYS;
}
@ -153,7 +153,7 @@ KResultOr<FlatPtr> handle(RegisterState& regs, FlatPtr function, FlatPtr arg1, F
auto handler = (HandlerWithRegisterState)syscall_metadata.handler;
result = (process.*(handler))(regs);
} else {
result = (process.*(syscall_metadata.handler))(arg1, arg2, arg3);
result = (process.*(syscall_metadata.handler))(arg1, arg2, arg3, arg4);
}
return result;
@ -207,9 +207,10 @@ NEVER_INLINE void syscall_handler(TrapFrame* trap)
FlatPtr arg1;
FlatPtr arg2;
FlatPtr arg3;
regs.capture_syscall_params(function, arg1, arg2, arg3);
FlatPtr arg4;
regs.capture_syscall_params(function, arg1, arg2, arg3, arg4);
auto result = Syscall::handle(regs, function, arg1, arg2, arg3);
auto result = Syscall::handle(regs, function, arg1, arg2, arg3, arg4);
if (result.is_error()) {
regs.set_return_reg(result.error());