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Kernel+LibC: Implement pthread_create for AArch64

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Instead of storing x86_64 register names in `SC_create_thread_params`,
let the Kernel figure out how to pass the parameters to
`pthread_create_helper`.
This commit is contained in:
Daniel Bertalan 2023-04-22 16:29:17 +02:00 committed by Andreas Kling
parent 9b9cc76b1d
commit d205814da6
Notes: sideshowbarker 2024-07-17 09:48:50 +09:00 
Author: https://github.com/BertalanD
Commit: https://github.com/SerenityOS/serenity/commit/d205814da6
Pull-request: https://github.com/SerenityOS/serenity/pull/18466
Reviewed-by: https://github.com/nico ✅
3 changed files with 20 additions and 22 deletions
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8
Kernel/API/Syscall.h
View file

@ -370,12 +370,8 @@ struct SC_create_thread_params {
unsigned int reported_guard_page_size = 0; // The lie we tell callers
unsigned int stack_size = 1 * MiB; // Equal to Thread::default_userspace_stack_size
void* stack_location; // nullptr means any, o.w. process virtual address
# if ARCH(X86_64)
FlatPtr rdi;
FlatPtr rsi;
FlatPtr rcx;
FlatPtr rdx;
# endif
void* (*entry)(void*);
void* entry_argument;
};
struct SC_realpath_params {

19
Kernel/Syscalls/thread.cpp
View file

@ -63,10 +63,21 @@ ErrorOr<FlatPtr> Process::sys$create_thread(void* (*entry)(void*), Userspace<Sys
regs.set_flags(0x0202);
regs.cr3 = address_space().with([](auto& space) { return space->page_directory().cr3(); });
regs.rdi = params.rdi;
regs.rsi = params.rsi;
regs.rdx = params.rdx;
regs.rcx = params.rcx;
// Set up the argument registers expected by pthread_create_helper.
regs.rdi = (FlatPtr)params.entry;
regs.rsi = (FlatPtr)params.entry_argument;
regs.rdx = (FlatPtr)params.stack_location;
regs.rcx = (FlatPtr)params.stack_size;
#elif ARCH(AARCH64)
regs.ttbr0_el1 = address_space().with([](auto& space) { return space->page_directory().ttbr0(); });
// Set up the argument registers expected by pthread_create_helper.
regs.x[0] = (FlatPtr)params.entry;
regs.x[1] = (FlatPtr)params.entry_argument;
regs.x[2] = (FlatPtr)params.stack_location;
regs.x[3] = (FlatPtr)params.stack_size;
#else
# error Unknown architecture
#endif
TRY(thread->make_thread_specific_region({}));

15
Userland/Libraries/LibC/pthread.cpp
View file

@ -90,18 +90,9 @@ static int create_thread(pthread_t* thread, void* (*entry)(void*), void* argumen
while (((uintptr_t)stack - 16) % 16 != 0)
push_on_stack(nullptr);
#if ARCH(X86_64)
thread_params->rdi = (FlatPtr)entry;
thread_params->rsi = (FlatPtr)argument;
thread_params->rdx = (FlatPtr)thread_params->stack_location;
thread_params->rcx = thread_params->stack_size;
#elif ARCH(AARCH64)
(void)entry;
(void)argument;
TODO_AARCH64();
#else
# error Unknown architecture
#endif
thread_params->entry = entry;
thread_params->entry_argument = argument;
VERIFY((uintptr_t)stack % 16 == 0);
// Push a fake return address