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Kernel: Tell compiler about invisible calls

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This makes the Kernel build cleanly with -Wmissing-declarations.
This commit is contained in:
Ben Wiederhake 2020-08-11 23:33:37 +02:00 committed by Andreas Kling
parent 8a41ce5cc7
commit 936d5dcc01
Notes: sideshowbarker 2024-07-19 03:41:52 +09:00 
Author: https://github.com/BenWiederhake
Commit: https://github.com/SerenityOS/serenity/commit/936d5dcc015
Pull-request: https://github.com/SerenityOS/serenity/pull/3096
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/stelar7
3 changed files with 47 additions and 28 deletions
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52
Kernel/Arch/i386/CPU.cpp
View file

@ -29,8 +29,9 @@
#include <AK/StringBuilder.h>
#include <AK/Types.h>
#include <Kernel/Arch/i386/CPU.h>
#include <Kernel/Arch/i386/ProcessorInfo.h>
#include <Kernel/Arch/i386/ISRStubs.h>
#include <Kernel/Arch/i386/ProcessorInfo.h>
#include <Kernel/IO.h>
#include <Kernel/Interrupts/APIC.h>
#include <Kernel/Interrupts/GenericInterruptHandler.h>
#include <Kernel/Interrupts/IRQHandler.h>
@ -44,7 +45,6 @@
#include <Kernel/Thread.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/VM/PageDirectory.h>
#include <Kernel/IO.h>
#include <LibC/mallocdefs.h>
//#define PAGE_FAULT_DEBUG
@ -58,6 +58,13 @@ static Descriptor s_idt[256];
static GenericInterruptHandler* s_interrupt_handler[GENERIC_INTERRUPT_HANDLERS_COUNT];
// The compiler can't see the calls to these functions inside assembly.
// Declare them, to avoid dead code warnings.
extern "C" void enter_thread_context(Thread* from_thread, Thread* to_thread);
extern "C" void context_first_init(Thread* from_thread, Thread* to_thread, TrapFrame* trap);
extern "C" u32 do_init_context(Thread* thread, u32 flags);
extern "C" void pre_init_finished(void);
extern "C" void post_init_finished(void);
extern "C" void handle_interrupt(TrapFrame*);
#define EH_ENTRY(ec, title) \
@ -337,7 +344,7 @@ void breakpoint_handler(TrapFrame* trap)
asm("movl %%cr4, %%eax" \
: "=a"(cr4)); \
klog() << "CR0=" << String::format("%x", cr0) << " CR2=" << String::format("%x", cr2) << " CR3=" << String::format("%x", cr3) << " CR4=" << String::format("%x", cr4); \
Processor::halt(); \
Processor::halt(); \
}
EH(2, "Unknown error")
@ -917,14 +924,14 @@ String Processor::features_string() const
};
bool first = true;
for (u32 flag = 1; flag < sizeof(m_features) * 8; flag <<= 1) {
if ((static_cast<u32>(m_features) & flag) != 0) {
if (first)
first = false;
else
builder.append(' ');
auto str = feature_to_str(static_cast<CPUFeature>(flag));
builder.append(str, strlen(str));
}
if ((static_cast<u32>(m_features) & flag) != 0) {
if (first)
first = false;
else
builder.append(' ');
auto str = feature_to_str(static_cast<CPUFeature>(flag));
builder.append(str, strlen(str));
}
}
return builder.build();
}
@ -998,7 +1005,7 @@ void Processor::write_raw_gdt_entry(u16 selector, u32 low, u32 high)
{
u16 i = (selector & 0xfffc) >> 3;
u32 prev_gdt_length = m_gdt_length;
if (i > m_gdt_length) {
m_gdt_length = i + 1;
ASSERT(m_gdt_length <= sizeof(m_gdt) / sizeof(m_gdt[0]));
@ -1174,11 +1181,11 @@ extern "C" void context_first_init(Thread* from_thread, Thread* to_thread, TrapF
(void)from_thread;
(void)to_thread;
(void)trap;
#ifdef CONTEXT_SWITCH_DEBUG
dbg() << "switch_context <-- from " << VirtualAddress(from_thread) << " " << *from_thread << " to " << VirtualAddress(to_thread) << " " << *to_thread << " (context_first_init)";
dbg() << "switch_context <-- from " << VirtualAddress(from_thread) << " " << *from_thread << " to " << VirtualAddress(to_thread) << " " << *to_thread << " (context_first_init)";
#endif
ASSERT(to_thread == Thread::current());
Scheduler::enter_current(*from_thread);
@ -1229,7 +1236,7 @@ u32 Processor::init_context(Thread& thread, bool leave_crit)
auto& tss = thread.tss();
bool return_to_user = (tss.cs & 3) != 0;
// make room for an interrupt frame
if (!return_to_user) {
// userspace_esp and userspace_ss are not popped off by iret
@ -1300,7 +1307,6 @@ u32 Processor::init_context(Thread& thread, bool leave_crit)
return stack_top;
}
extern "C" u32 do_init_context(Thread* thread, u32 flags)
{
ASSERT_INTERRUPTS_DISABLED();
@ -1367,7 +1373,7 @@ extern "C" void post_init_finished(void)
void Processor::initialize_context_switching(Thread& initial_thread)
{
ASSERT(initial_thread.process().is_ring0());
auto& tss = initial_thread.tss();
m_tss = tss;
m_tss.esp0 = tss.esp0;
@ -1375,9 +1381,9 @@ void Processor::initialize_context_switching(Thread& initial_thread)
// user mode needs to be able to switch to kernel mode:
m_tss.cs = m_tss.ds = m_tss.es = m_tss.gs = m_tss.ss = GDT_SELECTOR_CODE0 | 3;
m_tss.fs = GDT_SELECTOR_PROC | 3;
m_scheduler_initialized = true;
asm volatile(
"movl %[new_esp], %%esp \n" // swich to new stack
"pushl %[from_to_thread] \n" // to_thread
@ -1508,7 +1514,7 @@ void Processor::smp_enable()
for (size_t k = 0; k < msg_entries_cnt; k++)
msg_entries[msg_entry_i + k].msg = &msg;
}
atomic_store(&s_message_pool, &msgs[0], AK::MemoryOrder::memory_order_release);
// Start sending IPI messages
@ -1646,7 +1652,7 @@ void Processor::smp_broadcast_message(ProcessorMessage& msg, bool async)
}
}
void Processor::smp_broadcast(void(*callback)(void*), void* data, void(*free_data)(void*), bool async)
void Processor::smp_broadcast(void (*callback)(void*), void* data, void (*free_data)(void*), bool async)
{
auto& msg = smp_get_from_pool();
msg.type = ProcessorMessage::CallbackWithData;
@ -1656,7 +1662,7 @@ void Processor::smp_broadcast(void(*callback)(void*), void* data, void(*free_dat
smp_broadcast_message(msg, async);
}
void Processor::smp_broadcast(void(*callback)(), bool async)
void Processor::smp_broadcast(void (*callback)(), bool async)
{
auto& msg = smp_get_from_pool();
msg.type = ProcessorMessage::CallbackWithData;

17
Kernel/StdLib.cpp
View file

@ -282,11 +282,6 @@ char* strstr(const char* haystack, const char* needle)
return const_cast<char*>(haystack);
}
[[noreturn]] void __cxa_pure_virtual()
{
ASSERT_NOT_REACHED();
}
void* realloc(void* p, size_t s)
{
return krealloc(p, s);
@ -297,6 +292,13 @@ void free(void* p)
return kfree(p);
}
// Functions that are automatically called by the C++ compiler.
// Declare them first, to tell the silly compiler that they are indeed being used.
[[noreturn]] void __stack_chk_fail();
[[noreturn]] void __stack_chk_fail_local();
extern "C" int __cxa_atexit(void (*)(void*), void*, void*);
[[noreturn]] void __cxa_pure_virtual();
[[noreturn]] void __stack_chk_fail()
{
ASSERT_NOT_REACHED();
@ -312,4 +314,9 @@ extern "C" int __cxa_atexit(void (*)(void*), void*, void*)
ASSERT_NOT_REACHED();
return 0;
}
[[noreturn]] void __cxa_pure_virtual()
{
ASSERT_NOT_REACHED();
}
}

6
Kernel/init.cpp
View file

@ -89,6 +89,12 @@ namespace Kernel {
[[noreturn]] static void init_stage2();
static void setup_serial_debug();
// boot.S expects these functions precisely this this. We declare them here
// to ensure the signatures don't accidentally change.
extern "C" void init_finished(u32 cpu);
extern "C" [[noreturn]] void init_ap(u32 cpu, Processor* processor_info);
extern "C" [[noreturn]] void init();
VirtualConsole* tty0;
static Processor s_bsp_processor; // global but let's keep it "private"