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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/i386/regs.h>
#include <Kernel/Arch/x86/ASM_wrapper.h>
#include <Kernel/Arch/x86/CPU.h>
#include <AK/Platform.h>
VALIDATE_IS_X86()
namespace Kernel {
struct [[gnu::packed]] RegisterState {
#if ARCH(I386)
FlatPtr ss;
FlatPtr gs;
FlatPtr fs;
FlatPtr es;
FlatPtr ds;
FlatPtr edi;
FlatPtr esi;
FlatPtr ebp;
FlatPtr esp;
FlatPtr ebx;
FlatPtr edx;
FlatPtr ecx;
FlatPtr eax;
#else
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;
#endif
u16 exception_code;
u16 isr_number;
#if ARCH(X86_64)
u32 padding;
#endif
#if ARCH(I386)
FlatPtr eip;
#else
FlatPtr rip;
#endif
FlatPtr cs;
#if ARCH(I386)
FlatPtr eflags;
FlatPtr userspace_esp;
FlatPtr userspace_ss;
#else
FlatPtr rflags;
FlatPtr userspace_rsp;
FlatPtr userspace_ss;
#endif
#if ARCH(I386)
FlatPtr userspace_sp() const
{
return userspace_esp;
}
void set_userspace_sp(FlatPtr value) { userspace_esp = value; }
FlatPtr ip() const { return eip; }
void set_ip(FlatPtr value) { eip = value; }
void set_dx(FlatPtr value) { edx = value; }
FlatPtr bp() const { return ebp; }
void set_bp(FlatPtr value) { ebp = value; }
FlatPtr flags() const { return eflags; }
void set_flags(FlatPtr value) { eflags = value; }
void set_return_reg(FlatPtr value) { eax = value; }
#elif ARCH(X86_64)
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; }
#endif
void capture_syscall_params(FlatPtr& function, FlatPtr& arg1, FlatPtr& arg2, FlatPtr& arg3, FlatPtr& arg4) const
{
#if ARCH(I386)
function = eax;
arg1 = edx;
arg2 = ecx;
arg3 = ebx;
arg4 = esi;
#else
// 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;
#endif
}
};
#if ARCH(I386)
# define REGISTER_STATE_SIZE (19 * 4)
static_assert(AssertSize<RegisterState, REGISTER_STATE_SIZE>());
#elif ARCH(X86_64)
# define REGISTER_STATE_SIZE (22 * 8)
static_assert(AssertSize<RegisterState, REGISTER_STATE_SIZE>());
#endif
inline void copy_kernel_registers_into_ptrace_registers(PtraceRegisters& ptrace_regs, RegisterState const& kernel_regs)
{
#if ARCH(I386)
ptrace_regs.eax = kernel_regs.eax;
ptrace_regs.ecx = kernel_regs.ecx;
ptrace_regs.edx = kernel_regs.edx;
ptrace_regs.ebx = kernel_regs.ebx;
ptrace_regs.esp = kernel_regs.userspace_esp;
ptrace_regs.ebp = kernel_regs.ebp;
ptrace_regs.esi = kernel_regs.esi;
ptrace_regs.edi = kernel_regs.edi;
ptrace_regs.eip = kernel_regs.eip;
ptrace_regs.eflags = kernel_regs.eflags;
#else
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,
#endif
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)
{
#if ARCH(I386)
kernel_regs.eax = ptrace_regs.eax;
kernel_regs.ecx = ptrace_regs.ecx;
kernel_regs.edx = ptrace_regs.edx;
kernel_regs.ebx = ptrace_regs.ebx;
kernel_regs.esp = ptrace_regs.esp;
kernel_regs.ebp = ptrace_regs.ebp;
kernel_regs.esi = ptrace_regs.esi;
kernel_regs.edi = ptrace_regs.edi;
kernel_regs.eip = ptrace_regs.eip;
kernel_regs.eflags = (kernel_regs.eflags & ~safe_eflags_mask) | (ptrace_regs.eflags & safe_eflags_mask);
#else
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);
#endif
}
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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