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sortix--sortix/kernel/x64/thread.cpp
2014-03-01 14:37:41 +01:00

159 lines
4.6 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/>.
x64/thread.cpp
x64 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.rip = src->rip;
registers.userrsp = src->userrsp;
registers.rax = src->rax;
registers.rbx = src->rbx;
registers.rcx = src->rcx;
registers.rdx = src->rdx;
registers.rdi = src->rdi;
registers.rsi = src->rsi;
registers.rbp = src->rbp;
registers.r8 = src->r8;
registers.r9 = src->r9;
registers.r10 = src->r10;
registers.r11 = src->r11;
registers.r12 = src->r12;
registers.r13 = src->r13;
registers.r14 = src->r14;
registers.r15 = src->r15;
registers.cs = src->cs;
registers.ds = src->ds;
registers.ss = src->ss;
registers.rflags = src->rflags;
registers.kerrno = src->kerrno;
registers.signal_pending = src->signal_pending;
}
void Thread::LoadRegisters(CPU::InterruptRegisters* dest)
{
dest->rip = registers.rip;
dest->userrsp = registers.userrsp;
dest->rax = registers.rax;
dest->rbx = registers.rbx;
dest->rcx = registers.rcx;
dest->rdx = registers.rdx;
dest->rdi = registers.rdi;
dest->rsi = registers.rsi;
dest->rbp = registers.rbp;
dest->r8 = registers.r8;
dest->r9 = registers.r9;
dest->r10 = registers.r10;
dest->r11 = registers.r11;
dest->r12 = registers.r12;
dest->r13 = registers.r13;
dest->r14 = registers.r14;
dest->r15 = registers.r15;
dest->cs = registers.cs;
dest->ds = registers.ds;
dest->ss = registers.ss;
dest->rflags = registers.rflags;
dest->kerrno = registers.kerrno;
dest->signal_pending = registers.signal_pending;
}
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 register based
// calling convention, we call BootstrapKernelThread directly.
regs->rip = (addr_t) BootstrapKernelThread;
regs->userrsp = stack + stacksize - sizeof(size_t);
*((size_t*) regs->userrsp) = 0; /* back tracing stops at NULL rip */
regs->rax = 0;
regs->rbx = 0;
regs->rcx = 0;
regs->rdx = 0;
regs->rdi = (addr_t) user;
regs->rsi = (addr_t) entry;
regs->rbp = 0;
regs->r8 = 0;
regs->r9 = 0;
regs->r10 = 0;
regs->r11 = 0;
regs->r12 = 0;
regs->r13 = 0;
regs->r14 = 0;
regs->r15 = 0;
regs->cs = KCS | KRPL;
regs->ds = KDS | KRPL;
regs->ss = KDS | KRPL;
regs->rflags = FLAGS_RESERVED1 | FLAGS_INTERRUPT | FLAGS_ID;
regs->kerrno = 0;
regs->signal_pending = 0;
}
void Thread::HandleSignalFixupRegsCPU(CPU::InterruptRegisters* regs)
{
if ( regs->InUserspace() )
return;
regs->rip = regs->rdi;
regs->rflags = regs->rsi;
regs->userrsp = regs->r8;
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->userrsp -= RED_ZONE_SIZE;
regs->userrsp &= ~(STACK_ALIGNMENT-1UL);
regs->rbp = regs->userrsp;
regs->rdi = currentsignal;
regs->rip = (size_t) sighandler;
regs->rflags = FLAGS_RESERVED1 | FLAGS_INTERRUPT | FLAGS_ID;
regs->kerrno = 0;
regs->signal_pending = 0;
}
void Thread::GotoOnSigKill(CPU::InterruptRegisters* regs)
{
regs->rip = (unsigned long) Thread__OnSigKill;
regs->rdi = (unsigned long) this;
regs->userrsp = regs->rbp = kernelstackpos + kernelstacksize;
regs->rflags = 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