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sortix--sortix/kernel/x86/thread.cpp
2014-03-01 14:37:41 +01:00

145 lines
4.5 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
This file is part of Sortix.
Sortix is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
You should have received a copy of the GNU General Public License along with
Sortix. If not, see <http://www.gnu.org/licenses/>.
x86/thread.cpp
x86 specific parts of thread.cpp.
*******************************************************************************/
#include <stddef.h>
#include <stdint.h>
#include <sortix/kernel/kernel.h>
#include <sortix/kernel/thread.h>
namespace Sortix {
void Thread::SaveRegisters(const CPU::InterruptRegisters* src)
{
registers.eip = src->eip;
registers.useresp = src->useresp;
registers.eax = src->eax;
registers.ebx = src->ebx;
registers.ecx = src->ecx;
registers.edx = src->edx;
registers.edi = src->edi;
registers.esi = src->esi;
registers.ebp = src->ebp;
registers.cs = src->cs;
registers.ds = src->ds;
registers.ss = src->ss;
registers.eflags = src->eflags;
registers.kerrno = src->kerrno;
registers.signal_pending = src->signal_pending;
}
void Thread::LoadRegisters(CPU::InterruptRegisters* dest)
{
dest->eip = registers.eip;
dest->useresp = registers.useresp;
dest->eax = registers.eax;
dest->ebx = registers.ebx;
dest->ecx = registers.ecx;
dest->edx = registers.edx;
dest->edi = registers.edi;
dest->esi = registers.esi;
dest->ebp = registers.ebp;
dest->cs = registers.cs;
dest->ds = registers.ds;
dest->ss = registers.ss;
dest->eflags = registers.eflags;
dest->kerrno = registers.kerrno;
dest->signal_pending = registers.signal_pending;
}
extern "C" void asm_call_BootstrapKernelThread(void);
void SetupKernelThreadRegs(CPU::InterruptRegisters* regs, ThreadEntry entry,
void* user, addr_t stack, size_t stacksize)
{
// Instead of directly calling the desired entry point, we call a small
// stub that calls it for us and then destroys the kernel thread if
// the entry function returns. Note that since we use a stack based
// calling convention, we go through a proxy that uses %edi and %esi
// as parameters and pushes them to the stack and then does the call.
regs->eip = (addr_t) asm_call_BootstrapKernelThread;
regs->useresp = stack + stacksize - sizeof(size_t);
*((size_t*) regs->useresp) = 0; /* back tracing stops at NULL rip */
regs->eax = 0;
regs->ebx = 0;
regs->ecx = 0;
regs->edx = 0;
regs->edi = (addr_t) user;
regs->esi = (addr_t) entry;
regs->ebp = 0;
regs->cs = KCS | KRPL;
regs->ds = KDS | KRPL;
regs->ss = KDS | KRPL;
regs->eflags = FLAGS_RESERVED1 | FLAGS_INTERRUPT | FLAGS_ID;
regs->kerrno = 0;
regs->signal_pending = 0;
}
void Thread::HandleSignalFixupRegsCPU(CPU::InterruptRegisters* regs)
{
if ( regs->InUserspace() )
return;
uint32_t* params = (uint32_t*) regs->ebx;
regs->eip = params[0];
regs->eflags = params[2];
regs->useresp = params[3];
regs->cs = UCS | URPL;
regs->ds = UDS | URPL;
regs->ss = UDS | URPL;
}
void Thread::HandleSignalCPU(CPU::InterruptRegisters* regs)
{
const size_t STACK_ALIGNMENT = 16UL;
const size_t RED_ZONE_SIZE = 128UL;
regs->useresp -= RED_ZONE_SIZE;
regs->useresp &= ~(STACK_ALIGNMENT-1UL);
regs->ebp = regs->useresp;
regs->edi = currentsignal;
regs->eip = (size_t) sighandler;
regs->eflags = FLAGS_RESERVED1 | FLAGS_INTERRUPT | FLAGS_ID;
regs->kerrno = 0;
regs->signal_pending = 0;
}
extern "C" void asm_call_Thread__OnSigKill(void);
void Thread::GotoOnSigKill(CPU::InterruptRegisters* regs)
{
regs->eip = (unsigned long) asm_call_Thread__OnSigKill;
regs->edi = (unsigned long) this;
// TODO: HACK: The -256 is because if we are jumping to the safe stack
// we currently are on, this may not be fully supported by interrupt.s
// that is quite aware of this (but isn't perfect). If our destination
// is further down the stack, then we are probably safe.
regs->useresp = regs->ebp = kernelstackpos + kernelstacksize - 256;
regs->eflags = FLAGS_RESERVED1 | FLAGS_INTERRUPT | FLAGS_ID;
regs->cs = KCS | KRPL;
regs->ds = KDS | KRPL;
regs->ss = KDS | KRPL;
regs->kerrno = 0;
regs->signal_pending = 0;
}
} // namespace Sortix