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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Types.h>
#include <LibC/sys/arch/regs.h>
#include <Kernel/Arch/CPU.h>
#include <Kernel/Arch/x86_64/ASM_wrapper.h>
#include <Kernel/ExecutionMode.h>
#include <AK/Platform.h>
VALIDATE_IS_X86()
namespace Kernel {
struct [[gnu::packed]] RegisterState {
FlatPtr rdi;
FlatPtr rsi;
FlatPtr rbp;
FlatPtr rsp;
FlatPtr rbx;
FlatPtr rdx;
FlatPtr rcx;
FlatPtr rax;
FlatPtr r8;
FlatPtr r9;
FlatPtr r10;
FlatPtr r11;
FlatPtr r12;
FlatPtr r13;
FlatPtr r14;
FlatPtr r15;
u16 exception_code;
u16 isr_number;
u32 padding;
FlatPtr rip;
FlatPtr cs;
FlatPtr rflags;
FlatPtr userspace_rsp;
FlatPtr userspace_ss;
FlatPtr userspace_sp() const
{
return userspace_rsp;
}
void set_userspace_sp(FlatPtr value) { userspace_rsp = value; }
FlatPtr ip() const { return rip; }
void set_ip(FlatPtr value) { rip = value; }
void set_dx(FlatPtr value) { rdx = value; }
FlatPtr bp() const { return rbp; }
void set_bp(FlatPtr value) { rbp = value; }
FlatPtr flags() const { return rflags; }
void set_flags(FlatPtr value) { rflags = value; }
void set_return_reg(FlatPtr value) { rax = value; }
void capture_syscall_params(FlatPtr& function, FlatPtr& arg1, FlatPtr& arg2, FlatPtr& arg3, FlatPtr& arg4) const
{
// The syscall instruction clobbers rcx, so we must use a different calling convention to 32-bit.
function = rax;
arg1 = rdx;
arg2 = rdi;
arg3 = rbx;
arg4 = rsi;
}
ExecutionMode previous_mode() const
{
return ((cs & 3) != 0) ? ExecutionMode::User : ExecutionMode::Kernel;
}
};
#define REGISTER_STATE_SIZE (22 * 8)
static_assert(AssertSize<RegisterState, REGISTER_STATE_SIZE>());
inline void copy_kernel_registers_into_ptrace_registers(PtraceRegisters& ptrace_regs, RegisterState const& kernel_regs)
{
ptrace_regs.rax = kernel_regs.rax;
ptrace_regs.rcx = kernel_regs.rcx;
ptrace_regs.rdx = kernel_regs.rdx;
ptrace_regs.rbx = kernel_regs.rbx;
ptrace_regs.rsp = kernel_regs.userspace_rsp;
ptrace_regs.rbp = kernel_regs.rbp;
ptrace_regs.rsi = kernel_regs.rsi;
ptrace_regs.rdi = kernel_regs.rdi;
ptrace_regs.rip = kernel_regs.rip;
ptrace_regs.r8 = kernel_regs.r8;
ptrace_regs.r9 = kernel_regs.r9;
ptrace_regs.r10 = kernel_regs.r10;
ptrace_regs.r11 = kernel_regs.r11;
ptrace_regs.r12 = kernel_regs.r12;
ptrace_regs.r13 = kernel_regs.r13;
ptrace_regs.r14 = kernel_regs.r14;
ptrace_regs.r15 = kernel_regs.r15;
ptrace_regs.rflags = kernel_regs.rflags,
ptrace_regs.cs = 0;
ptrace_regs.ss = 0;
ptrace_regs.ds = 0;
ptrace_regs.es = 0;
ptrace_regs.fs = 0;
ptrace_regs.gs = 0;
}
inline void copy_ptrace_registers_into_kernel_registers(RegisterState& kernel_regs, PtraceRegisters const& ptrace_regs)
{
kernel_regs.rax = ptrace_regs.rax;
kernel_regs.rcx = ptrace_regs.rcx;
kernel_regs.rdx = ptrace_regs.rdx;
kernel_regs.rbx = ptrace_regs.rbx;
kernel_regs.rsp = ptrace_regs.rsp;
kernel_regs.rbp = ptrace_regs.rbp;
kernel_regs.rsi = ptrace_regs.rsi;
kernel_regs.rdi = ptrace_regs.rdi;
kernel_regs.rip = ptrace_regs.rip;
kernel_regs.r8 = ptrace_regs.r8;
kernel_regs.r9 = ptrace_regs.r9;
kernel_regs.r10 = ptrace_regs.r10;
kernel_regs.r11 = ptrace_regs.r11;
kernel_regs.r12 = ptrace_regs.r12;
kernel_regs.r13 = ptrace_regs.r13;
kernel_regs.r14 = ptrace_regs.r14;
kernel_regs.r15 = ptrace_regs.r15;
// FIXME: do we need a separate safe_rflags_mask here?
kernel_regs.rflags = (kernel_regs.rflags & ~safe_eflags_mask) | (ptrace_regs.rflags & safe_eflags_mask);
}
struct [[gnu::packed]] DebugRegisterState {
FlatPtr dr0;
FlatPtr dr1;
FlatPtr dr2;
FlatPtr dr3;
FlatPtr dr6;
FlatPtr dr7;
};
inline void read_debug_registers_into(DebugRegisterState& state)
{
state.dr0 = read_dr0();
state.dr1 = read_dr1();
state.dr2 = read_dr2();
state.dr3 = read_dr3();
state.dr6 = read_dr6();
state.dr7 = read_dr7();
}
inline void write_debug_registers_from(DebugRegisterState const& state)
{
write_dr0(state.dr0);
write_dr1(state.dr1);
write_dr2(state.dr2);
write_dr3(state.dr3);
write_dr6(state.dr6);
write_dr7(state.dr7);
}
inline void clear_debug_registers()
{
write_dr0(0);
write_dr1(0);
write_dr2(0);
write_dr3(0);
write_dr7(1 << 10); // Bit 10 is reserved and must be set to 1.
}
}
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