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Kernel: Enable building the kernel with -flto

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GCC with -flto is more aggressive when it comes to inlining and
discarding functions which is why we must mark some of the functions
as NEVER_INLINE (because they contain asm labels which would be
duplicated in the object files if the compiler decides to inline
the function elsewhere) and __attribute__((used)) for others so
that GCC doesn't discard them.
This commit is contained in:
Gunnar Beutner 2021-04-29 14:54:15 +02:00 • committed by Andreas Kling
parent b861259098
commit 55ae52fdf8
9 changed files with 57 additions and 57 deletions
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8
Kernel/Arch/x86/CPU.h
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@ -980,7 +980,7 @@ public:
void exit_trap(TrapFrame& trap);
[[noreturn]] void initialize_context_switching(Thread& initial_thread);
void switch_context(Thread*& from_thread, Thread*& to_thread);
NEVER_INLINE void switch_context(Thread*& from_thread, Thread*& to_thread);
[[noreturn]] static void assume_context(Thread& thread, FlatPtr flags);
u32 init_context(Thread& thread, bool leave_crit);
static Vector<FlatPtr> capture_stack_trace(Thread& thread, size_t max_frames = 0);
@ -1057,9 +1057,9 @@ struct TrapFrame {
static_assert(TRAP_FRAME_SIZE == sizeof(TrapFrame));
extern "C" void enter_trap_no_irq(TrapFrame*);
extern "C" void enter_trap(TrapFrame*);
extern "C" void exit_trap(TrapFrame*);
extern "C" void enter_trap_no_irq(TrapFrame*) __attribute__((used));
extern "C" void enter_trap(TrapFrame*) __attribute__((used));
extern "C" void exit_trap(TrapFrame*) __attribute__((used));
class MSR {
uint32_t m_msr;

16
Kernel/Arch/x86/SafeMem.h
View file

@ -14,14 +14,14 @@ namespace Kernel {
struct RegisterState;
[[nodiscard]] bool safe_memcpy(void* dest_ptr, const void* src_ptr, size_t n, void*& fault_at);
[[nodiscard]] ssize_t safe_strnlen(const char* str, size_t max_n, void*& fault_at);
[[nodiscard]] bool safe_memset(void* dest_ptr, int c, size_t n, void*& fault_at);
[[nodiscard]] Optional<u32> safe_atomic_fetch_add_relaxed(volatile u32* var, u32 val);
[[nodiscard]] Optional<u32> safe_atomic_exchange_relaxed(volatile u32* var, u32 val);
[[nodiscard]] Optional<u32> safe_atomic_load_relaxed(volatile u32* var);
[[nodiscard]] bool safe_atomic_store_relaxed(volatile u32* var, u32 val);
[[nodiscard]] Optional<bool> safe_atomic_compare_exchange_relaxed(volatile u32* var, u32& expected, u32 val);
[[nodiscard]] bool safe_memcpy(void* dest_ptr, const void* src_ptr, size_t n, void*& fault_at) __attribute__((used));
[[nodiscard]] ssize_t safe_strnlen(const char* str, size_t max_n, void*& fault_at) __attribute__((used));
[[nodiscard]] bool safe_memset(void* dest_ptr, int c, size_t n, void*& fault_at) __attribute__((used));
[[nodiscard]] Optional<u32> safe_atomic_fetch_add_relaxed(volatile u32* var, u32 val) __attribute__((used));
[[nodiscard]] Optional<u32> safe_atomic_exchange_relaxed(volatile u32* var, u32 val) __attribute__((used));
[[nodiscard]] Optional<u32> safe_atomic_load_relaxed(volatile u32* var) __attribute__((used));
[[nodiscard]] bool safe_atomic_store_relaxed(volatile u32* var, u32 val) __attribute__((used));
[[nodiscard]] Optional<bool> safe_atomic_compare_exchange_relaxed(volatile u32* var, u32& expected, u32 val) __attribute__((used));
[[nodiscard]] ALWAYS_INLINE Optional<u32> safe_atomic_fetch_and_relaxed(volatile u32* var, u32 val)
{