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Kernel: Replace raw asm functions with naked ones

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Hendiadyoin1 2021-07-05 15:34:07 +02:00 • committed by Gunnar Beutner
parent c830de4983
commit 9b7e48c6bd
7 changed files with 203 additions and 202 deletions
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76
Kernel/Arch/x86/x86_64/Processor.cpp
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@ -15,47 +15,43 @@
namespace Kernel {
extern "C" void thread_context_first_enter(void);
extern "C" void exit_kernel_thread(void);
NAKED void thread_context_first_enter(void)
{
// enter_thread_context returns to here first time a thread is executing
asm(
// switch_context will have pushed from_thread and to_thread to our news
// stack prior to thread_context_first_enter() being called, and the
// pointer to TrapFrame was the top of the stack before that
" popq %rdi \n" // from_thread (argument 0)
" popq %rsi \n" // to_thread (argument 1)
" popq %rdx \n" // pointer to TrapFrame (argument 2)
" cld \n"
" call context_first_init \n"
" jmp common_trap_exit \n");
};
// clang-format off
asm(
// enter_thread_context returns to here first time a thread is executing
".globl thread_context_first_enter \n"
"thread_context_first_enter: \n"
// switch_context will have pushed from_thread and to_thread to our new
// stack prior to thread_context_first_enter() being called, and the
// pointer to TrapFrame was the top of the stack before that
" popq %rdi \n" // from_thread (argument 0)
" popq %rsi \n" // to_thread (argument 1)
" popq %rdx \n" // pointer to TrapFrame (argument 2)
" cld \n"
" call context_first_init \n"
" jmp common_trap_exit \n"
);
// clang-format on
// clang-format off
asm(
".global do_assume_context \n"
"do_assume_context: \n"
" movq %rdi, %r12 \n" // save thread ptr
" movq %rsi, %r13 \n" // save flags
// We're going to call Processor::init_context, so just make sure
// we have enough stack space so we don't stomp over it
" subq $(" __STRINGIFY(16 + REGISTER_STATE_SIZE + TRAP_FRAME_SIZE + 8) "), %rsp \n"
" cld \n"
" call do_init_context \n"
" movq %rax, %rsp \n" // move stack pointer to what Processor::init_context set up for us
" movq %r12, %rdi \n" // to_thread
" movq %r12, %rsi \n" // from_thread
" pushq %r12 \n" // to_thread (for thread_context_first_enter)
" pushq %r12 \n" // from_thread (for thread_context_first_enter)
" movabs $thread_context_first_enter, %r12 \n" // should be same as regs.rip
" pushq %r12 \n"
" jmp enter_thread_context \n"
);
// clang-format on
NAKED void do_assume_context(Thread*, u32)
{
// clang-format off
// FIXME: I hope (Thread* thread, u32 flags) aren't compiled away
asm(
" movq %rdi, %r12 \n" // save thread ptr
" movq %rsi, %r13 \n" // save flags
// We're going to call Processor::init_context, so just make sure
// we have enough stack space so we don't stomp over it
" subq $(" __STRINGIFY(16 + REGISTER_STATE_SIZE + TRAP_FRAME_SIZE + 8) "), %rsp \n"
" cld \n"
" call do_init_context \n"
" movq %rax, %rsp \n" // move stack pointer to what Processor::init_context set up for us
" movq %r12, %rdi \n" // to_thread
" movq %r12, %rsi \n" // from_thread
" pushq %r12 \n" // to_thread (for thread_context_first_enter)
" pushq %r12 \n" // from_thread (for thread_context_first_enter)
" movabs $thread_context_first_enter, %r12 \n" // should be same as regs.rip
" pushq %r12 \n"
" jmp enter_thread_context \n");
// clang-format on
}
String Processor::platform_string() const
{