RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-31 11:58:12 +00:00
Code Issues Activity Actions

Kernel: Remove i686 support

Browse source
This commit is contained in:
Liav A 2022-10-04 03:05:54 +03:00 • committed by Andreas Kling
parent 32270dcd20
commit 5ff318cf3a
75 changed files with 142 additions and 895 deletions
Download patch file Download diff file Expand all files Collapse all files

39
Kernel/Process.cpp
View file

@ -274,9 +274,7 @@ LockRefPtr<Process> Process::create_kernel_process(LockRefPtr<Thread>& first_thr
auto process = process_or_error.release_value();
first_thread->regs().set_ip((FlatPtr)entry);
#if ARCH(I386)
first_thread->regs().esp = FlatPtr(entry_data); // entry function argument is expected to be in regs.esp
#elif ARCH(X86_64)
#if ARCH(X86_64)
first_thread->regs().rdi = FlatPtr(entry_data); // entry function argument is expected to be in regs.rdi
#elif ARCH(AARCH64)
(void)entry_data;
@ -396,40 +394,7 @@ Process::~Process()
extern void signal_trampoline_dummy() __attribute__((used));
void signal_trampoline_dummy()
{
#if ARCH(I386)
// The trampoline preserves the current eax, pushes the signal code and
// then calls the signal handler. We do this because, when interrupting a
// blocking syscall, that syscall may return some special error code in eax;
// This error code would likely be overwritten by the signal handler, so it's
// necessary to preserve it here.
constexpr static auto offset_to_first_register_slot = sizeof(__ucontext) + sizeof(siginfo) + sizeof(FPUState) + 4 * sizeof(FlatPtr);
asm(
".intel_syntax noprefix\n"
".globl asm_signal_trampoline\n"
"asm_signal_trampoline:\n"
// stack state: 0, ucontext, signal_info, (alignment = 16), fpu_state (alignment = 16), 0, ucontext*, siginfo*, signal, (alignment = 16), handler
// Pop the handler into ecx
"pop ecx\n" // save handler
// we have to save eax 'cause it might be the return value from a syscall
"mov [esp+%P1], eax\n"
// Note that the stack is currently aligned to 16 bytes as we popped the extra entries above.
// and it's already setup to call the handler with the expected values on the stack.
// call the signal handler
"call ecx\n"
// drop the 4 arguments
"add esp, 16\n"
// Current stack state is just saved_eax, ucontext, signal_info, fpu_state?.
// syscall SC_sigreturn
"mov eax, %P0\n"
"int 0x82\n"
".globl asm_signal_trampoline_end\n"
"asm_signal_trampoline_end:\n"
".att_syntax"
:
: "i"(Syscall::SC_sigreturn),
"i"(offset_to_first_register_slot));
#elif ARCH(X86_64)
#if ARCH(X86_64)
// The trampoline preserves the current rax, pushes the signal code and
// then calls the signal handler. We do this because, when interrupting a
// blocking syscall, that syscall may return some special error code in eax;