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Kernel: Allow building the kernel with -O0

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Unfortunately the kernel doesn't run with -O0 but at least it can be
successfully built with this change.
This commit is contained in:
Gunnar Beutner 2021-05-28 16:08:51 +02:00 • committed by Linus Groh
commit 4fca9ee060
Notes: sideshowbarker 2024-07-18 17:15:55 +09:00
2 changed files with 48 additions and 40 deletions
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70
Kernel/Syscall.cpp
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@ -16,43 +16,47 @@ namespace Kernel {
extern "C" void syscall_handler(TrapFrame*) __attribute__((used));
extern "C" void syscall_asm_entry();
// clang-format off
static void syscall_asm_entry_dummy() __attribute__((used));
NEVER_INLINE void syscall_asm_entry_dummy()
{
// clang-format off
#if ARCH(I386)
asm(
".globl syscall_asm_entry\n"
"syscall_asm_entry:\n"
" pushl $0x0\n"
" pusha\n"
" pushl %ds\n"
" pushl %es\n"
" pushl %fs\n"
" pushl %gs\n"
" pushl %ss\n"
" mov $" __STRINGIFY(GDT_SELECTOR_DATA0) ", %ax\n"
" mov %ax, %ds\n"
" mov %ax, %es\n"
" mov $" __STRINGIFY(GDT_SELECTOR_PROC) ", %ax\n"
" mov %ax, %fs\n"
" cld\n"
" xor %esi, %esi\n"
" xor %edi, %edi\n"
" pushl %esp \n" // set TrapFrame::regs
" subl $" __STRINGIFY(TRAP_FRAME_SIZE - 4) ", %esp \n"
" movl %esp, %ebx \n"
" pushl %ebx \n" // push pointer to TrapFrame
" call enter_trap_no_irq \n"
" movl %ebx, 0(%esp) \n" // push pointer to TrapFrame
" call syscall_handler \n"
" movl %ebx, 0(%esp) \n" // push pointer to TrapFrame
" jmp common_trap_exit \n");
asm(
".globl syscall_asm_entry\n"
"syscall_asm_entry:\n"
" pushl $0x0\n"
" pusha\n"
" pushl %ds\n"
" pushl %es\n"
" pushl %fs\n"
" pushl %gs\n"
" pushl %ss\n"
" mov $" __STRINGIFY(GDT_SELECTOR_DATA0) ", %ax\n"
" mov %ax, %ds\n"
" mov %ax, %es\n"
" mov $" __STRINGIFY(GDT_SELECTOR_PROC) ", %ax\n"
" mov %ax, %fs\n"
" cld\n"
" xor %esi, %esi\n"
" xor %edi, %edi\n"
" pushl %esp \n" // set TrapFrame::regs
" subl $" __STRINGIFY(TRAP_FRAME_SIZE - 4) ", %esp \n"
" movl %esp, %ebx \n"
" pushl %ebx \n" // push pointer to TrapFrame
" call enter_trap_no_irq \n"
" movl %ebx, 0(%esp) \n" // push pointer to TrapFrame
" call syscall_handler \n"
" movl %ebx, 0(%esp) \n" // push pointer to TrapFrame
" jmp common_trap_exit \n");
#elif ARCH(X86_64)
asm(
".globl syscall_asm_entry\n"
"syscall_asm_entry:\n"
" cli\n"
" hlt\n");
".globl syscall_asm_entry\n"
"syscall_asm_entry:\n"
" cli\n"
" hlt\n");
#endif
// clang-format on
// clang-format on
}
namespace Syscall {