mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-29 19:10:26 +00:00
da88d766b2
This commits inserts TODOs into all necessary places to make the kernel compile on riscv64!
109 lines
3.4 KiB
C++
109 lines
3.4 KiB
C++
/*
|
|
* Copyright (c) 2022, Timon Kruiper <timonkruiper@gmail.com>
|
|
* Copyright (c) 2023, Daniel Bertalan <dani@danielbertalan.dev>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <Kernel/Arch/RegisterState.h>
|
|
#include <Kernel/Arch/SafeMem.h>
|
|
#include <Kernel/Library/StdLib.h>
|
|
|
|
#define CODE_SECTION(section_name) __attribute__((section(section_name)))
|
|
|
|
extern "C" u8 start_of_safemem_text[];
|
|
extern "C" u8 end_of_safemem_text[];
|
|
|
|
extern "C" u8 start_of_safemem_atomic_text[];
|
|
extern "C" u8 end_of_safemem_atomic_text[];
|
|
|
|
namespace Kernel {
|
|
|
|
CODE_SECTION(".text.safemem")
|
|
NEVER_INLINE FLATTEN bool safe_memset(void* dest_ptr, int c, size_t n, void*& fault_at)
|
|
{
|
|
// FIXME: Actually implement a safe memset.
|
|
auto* dest = static_cast<u8*>(dest_ptr);
|
|
for (; n--;)
|
|
*dest++ = c;
|
|
fault_at = nullptr;
|
|
return true;
|
|
}
|
|
|
|
CODE_SECTION(".text.safemem")
|
|
NEVER_INLINE FLATTEN ssize_t safe_strnlen(char const* str, unsigned long max_n, void*& fault_at)
|
|
{
|
|
// FIXME: Actually implement a safe strnlen.
|
|
size_t len = 0;
|
|
for (; len < max_n && *str; str++)
|
|
len++;
|
|
fault_at = nullptr;
|
|
return len;
|
|
}
|
|
|
|
CODE_SECTION(".text.safemem")
|
|
NEVER_INLINE FLATTEN bool safe_memcpy(void* dest_ptr, void const* src_ptr, unsigned long n, void*& fault_at)
|
|
{
|
|
// FIXME: Actually implement a safe memcpy.
|
|
auto* pd = static_cast<u8*>(dest_ptr);
|
|
auto const* ps = static_cast<u8 const*>(src_ptr);
|
|
for (; n--;)
|
|
*pd++ = *ps++;
|
|
fault_at = nullptr;
|
|
return true;
|
|
}
|
|
|
|
CODE_SECTION(".text.safemem.atomic")
|
|
NEVER_INLINE FLATTEN Optional<bool> safe_atomic_compare_exchange_relaxed(u32 volatile* var, u32& expected, u32 val)
|
|
{
|
|
// FIXME: Handle access faults.
|
|
return AK::atomic_compare_exchange_strong(var, expected, val, AK::memory_order_relaxed);
|
|
}
|
|
|
|
CODE_SECTION(".text.safemem.atomic")
|
|
NEVER_INLINE FLATTEN Optional<u32> safe_atomic_load_relaxed(u32 volatile* var)
|
|
{
|
|
// FIXME: Handle access faults.
|
|
return AK::atomic_load(var, AK::memory_order_relaxed);
|
|
}
|
|
|
|
CODE_SECTION(".text.safemem.atomic")
|
|
NEVER_INLINE FLATTEN Optional<u32> safe_atomic_fetch_add_relaxed(u32 volatile* var, u32 val)
|
|
{
|
|
// FIXME: Handle access faults.
|
|
return AK::atomic_fetch_add(var, val, AK::memory_order_relaxed);
|
|
}
|
|
|
|
CODE_SECTION(".text.safemem.atomic")
|
|
NEVER_INLINE FLATTEN Optional<u32> safe_atomic_exchange_relaxed(u32 volatile* var, u32 val)
|
|
{
|
|
// FIXME: Handle access faults.
|
|
return AK::atomic_exchange(var, val, AK::memory_order_relaxed);
|
|
}
|
|
|
|
CODE_SECTION(".text.safemem.atomic")
|
|
NEVER_INLINE FLATTEN bool safe_atomic_store_relaxed(u32 volatile* var, u32 val)
|
|
{
|
|
// FIXME: Handle access faults.
|
|
AK::atomic_store(var, val);
|
|
return true;
|
|
}
|
|
|
|
bool handle_safe_access_fault(RegisterState& regs, FlatPtr fault_address)
|
|
{
|
|
FlatPtr ip = regs.ip();
|
|
|
|
if (ip >= (FlatPtr)&start_of_safemem_text && ip < (FlatPtr)&end_of_safemem_text) {
|
|
dbgln("FIXME: Faulted while accessing userspace address {:p}.", fault_address);
|
|
dbgln(" We need to jump back into the appropriate SafeMem function, set fault_at and return failure.");
|
|
TODO_RISCV64();
|
|
} else if (ip >= (FlatPtr)&start_of_safemem_atomic_text && ip < (FlatPtr)&end_of_safemem_atomic_text) {
|
|
dbgln("FIXME: Faulted while accessing userspace address {:p}.", fault_address);
|
|
dbgln(" We need to jump back into the appropriate atomic SafeMem function and return failure.");
|
|
TODO_RISCV64();
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
}
|