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https://github.com/RGBCube/serenity
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Kernel: Enable building the kernel with -flto
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
Andreas Kling
parent
b861259098
commit
55ae52fdf8
9 changed files with 57 additions and 57 deletions
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@ -47,20 +47,20 @@ static EntropySource s_entropy_source_interrupts { EntropySource::Static::Interr
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// The compiler can't see the calls to these functions inside assembly.
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// Declare them, to avoid dead code warnings.
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extern "C" void enter_thread_context(Thread* from_thread, Thread* to_thread);
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extern "C" void context_first_init(Thread* from_thread, Thread* to_thread, TrapFrame* trap);
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extern "C" u32 do_init_context(Thread* thread, u32 flags);
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extern "C" void enter_thread_context(Thread* from_thread, Thread* to_thread) __attribute__((used));
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extern "C" void context_first_init(Thread* from_thread, Thread* to_thread, TrapFrame* trap) __attribute__((used));
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extern "C" u32 do_init_context(Thread* thread, u32 flags) __attribute__((used));
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extern "C" void exit_kernel_thread(void);
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extern "C" void pre_init_finished(void);
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extern "C" void post_init_finished(void);
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extern "C" void handle_interrupt(TrapFrame*);
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extern "C" void pre_init_finished(void) __attribute__((used));
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extern "C" void post_init_finished(void) __attribute__((used));
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extern "C" void handle_interrupt(TrapFrame*) __attribute__((used));
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// clang-format off
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#if ARCH(I386)
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#define EH_ENTRY(ec, title) \
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extern "C" void title##_asm_entry(); \
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extern "C" void title##_handler(TrapFrame*); \
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extern "C" void title##_handler(TrapFrame*) __attribute__((used)); \
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asm( \
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".globl " #title "_asm_entry\n" \
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"" #title "_asm_entry: \n" \
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@ -84,8 +84,8 @@ extern "C" void handle_interrupt(TrapFrame*);
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" jmp common_trap_exit \n");
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#define EH_ENTRY_NO_CODE(ec, title) \
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extern "C" void title##_handler(TrapFrame*); \
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extern "C" void title##_asm_entry(); \
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extern "C" void title##_asm_entry(); \
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extern "C" void title##_handler(TrapFrame*) __attribute__((used)); \
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asm( \
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".globl " #title "_asm_entry\n" \
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"" #title "_asm_entry: \n" \
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@ -40,7 +40,7 @@ extern "C" u8* safe_atomic_compare_exchange_relaxed_faulted;
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namespace Kernel {
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CODE_SECTION(".text.safemem")
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bool safe_memcpy(void* dest_ptr, const void* src_ptr, size_t n, void*& fault_at)
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NEVER_INLINE bool safe_memcpy(void* dest_ptr, const void* src_ptr, size_t n, void*& fault_at)
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{
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fault_at = nullptr;
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size_t dest = (size_t)dest_ptr;
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@ -86,7 +86,7 @@ bool safe_memcpy(void* dest_ptr, const void* src_ptr, size_t n, void*& fault_at)
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}
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CODE_SECTION(".text.safemem")
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ssize_t safe_strnlen(const char* str, size_t max_n, void*& fault_at)
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NEVER_INLINE ssize_t safe_strnlen(const char* str, size_t max_n, void*& fault_at)
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{
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ssize_t count = 0;
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fault_at = nullptr;
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@ -115,7 +115,7 @@ ssize_t safe_strnlen(const char* str, size_t max_n, void*& fault_at)
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}
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CODE_SECTION(".text.safemem")
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bool safe_memset(void* dest_ptr, int c, size_t n, void*& fault_at)
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NEVER_INLINE bool safe_memset(void* dest_ptr, int c, size_t n, void*& fault_at)
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{
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fault_at = nullptr;
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size_t dest = (size_t)dest_ptr;
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@ -163,7 +163,7 @@ bool safe_memset(void* dest_ptr, int c, size_t n, void*& fault_at)
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}
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CODE_SECTION(".text.safemem.atomic")
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Optional<u32> safe_atomic_fetch_add_relaxed(volatile u32* var, u32 val)
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NEVER_INLINE Optional<u32> safe_atomic_fetch_add_relaxed(volatile u32* var, u32 val)
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{
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u32 result;
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bool error;
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@ -181,7 +181,7 @@ Optional<u32> safe_atomic_fetch_add_relaxed(volatile u32* var, u32 val)
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}
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CODE_SECTION(".text.safemem.atomic")
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Optional<u32> safe_atomic_exchange_relaxed(volatile u32* var, u32 val)
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NEVER_INLINE Optional<u32> safe_atomic_exchange_relaxed(volatile u32* var, u32 val)
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{
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u32 result;
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bool error;
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@ -199,7 +199,7 @@ Optional<u32> safe_atomic_exchange_relaxed(volatile u32* var, u32 val)
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}
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CODE_SECTION(".text.safemem.atomic")
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Optional<u32> safe_atomic_load_relaxed(volatile u32* var)
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NEVER_INLINE Optional<u32> safe_atomic_load_relaxed(volatile u32* var)
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{
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u32 result;
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bool error;
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@ -217,7 +217,7 @@ Optional<u32> safe_atomic_load_relaxed(volatile u32* var)
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}
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CODE_SECTION(".text.safemem.atomic")
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bool safe_atomic_store_relaxed(volatile u32* var, u32 val)
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NEVER_INLINE bool safe_atomic_store_relaxed(volatile u32* var, u32 val)
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{
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bool error;
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asm volatile(
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@ -232,7 +232,7 @@ bool safe_atomic_store_relaxed(volatile u32* var, u32 val)
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}
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CODE_SECTION(".text.safemem.atomic")
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Optional<bool> safe_atomic_compare_exchange_relaxed(volatile u32* var, u32& expected, u32 val)
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NEVER_INLINE Optional<bool> safe_atomic_compare_exchange_relaxed(volatile u32* var, u32& expected, u32 val)
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{
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// NOTE: accessing expected is NOT protected as it should always point
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// to a valid location in kernel memory!
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@ -980,7 +980,7 @@ public:
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void exit_trap(TrapFrame& trap);
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[[noreturn]] void initialize_context_switching(Thread& initial_thread);
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void switch_context(Thread*& from_thread, Thread*& to_thread);
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NEVER_INLINE void switch_context(Thread*& from_thread, Thread*& to_thread);
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[[noreturn]] static void assume_context(Thread& thread, FlatPtr flags);
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u32 init_context(Thread& thread, bool leave_crit);
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static Vector<FlatPtr> capture_stack_trace(Thread& thread, size_t max_frames = 0);
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@ -1057,9 +1057,9 @@ struct TrapFrame {
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static_assert(TRAP_FRAME_SIZE == sizeof(TrapFrame));
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extern "C" void enter_trap_no_irq(TrapFrame*);
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extern "C" void enter_trap(TrapFrame*);
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extern "C" void exit_trap(TrapFrame*);
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extern "C" void enter_trap_no_irq(TrapFrame*) __attribute__((used));
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extern "C" void enter_trap(TrapFrame*) __attribute__((used));
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extern "C" void exit_trap(TrapFrame*) __attribute__((used));
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class MSR {
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uint32_t m_msr;
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@ -14,14 +14,14 @@ namespace Kernel {
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struct RegisterState;
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[[nodiscard]] bool safe_memcpy(void* dest_ptr, const void* src_ptr, size_t n, void*& fault_at);
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[[nodiscard]] ssize_t safe_strnlen(const char* str, size_t max_n, void*& fault_at);
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[[nodiscard]] bool safe_memset(void* dest_ptr, int c, size_t n, void*& fault_at);
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[[nodiscard]] Optional<u32> safe_atomic_fetch_add_relaxed(volatile u32* var, u32 val);
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[[nodiscard]] Optional<u32> safe_atomic_exchange_relaxed(volatile u32* var, u32 val);
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[[nodiscard]] Optional<u32> safe_atomic_load_relaxed(volatile u32* var);
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[[nodiscard]] bool safe_atomic_store_relaxed(volatile u32* var, u32 val);
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[[nodiscard]] Optional<bool> safe_atomic_compare_exchange_relaxed(volatile u32* var, u32& expected, u32 val);
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[[nodiscard]] bool safe_memcpy(void* dest_ptr, const void* src_ptr, size_t n, void*& fault_at) __attribute__((used));
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[[nodiscard]] ssize_t safe_strnlen(const char* str, size_t max_n, void*& fault_at) __attribute__((used));
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[[nodiscard]] bool safe_memset(void* dest_ptr, int c, size_t n, void*& fault_at) __attribute__((used));
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[[nodiscard]] Optional<u32> safe_atomic_fetch_add_relaxed(volatile u32* var, u32 val) __attribute__((used));
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[[nodiscard]] Optional<u32> safe_atomic_exchange_relaxed(volatile u32* var, u32 val) __attribute__((used));
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[[nodiscard]] Optional<u32> safe_atomic_load_relaxed(volatile u32* var) __attribute__((used));
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[[nodiscard]] bool safe_atomic_store_relaxed(volatile u32* var, u32 val) __attribute__((used));
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[[nodiscard]] Optional<bool> safe_atomic_compare_exchange_relaxed(volatile u32* var, u32& expected, u32 val) __attribute__((used));
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[[nodiscard]] ALWAYS_INLINE Optional<u32> safe_atomic_fetch_and_relaxed(volatile u32* var, u32 val)
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{
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