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Implement userspace TLS, remove RW Locks

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This commit is contained in:
Kamil Kowalczyk
2026-01-28 23:52:48 +01:00
parent a3b62ebd3d
commit 3d23187acf
17 changed files with 135 additions and 157 deletions
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38
kernel/amd64/proc.c
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@@ -1,6 +1,7 @@
#include <amd64/gdt.h>
#include <amd64/proc.h>
#include <aux/elf.h>
#include <libk/align.h>
#include <libk/list.h>
#include <libk/rbtree.h>
#include <libk/std.h>
@@ -11,12 +12,11 @@
#include <proc/proc.h>
#include <proc/procgroup.h>
#include <proc/resource.h>
#include <sync/rw_spin_lock.h>
#include <sync/spin_lock.h>
#include <sys/debug.h>
#include <sys/proc.h>
/* 0 is kpproc */
static atomic_int pids = 1;
static atomic_int pids = 0;
struct proc* proc_from_elf (uint8_t* elf_contents) {
struct limine_hhdm_response* hhdm = limine_hhdm_request.response;
@@ -87,6 +87,8 @@ struct proc* proc_clone (struct proc* proto, uintptr_t vstack_top, uintptr_t ent
proc->pdata.regs.cs = GDT_UCODE | 0x03;
proc->pdata.regs.rip = (uint64_t)entry;
proc_init_tls (proc);
return proc;
}
@@ -116,10 +118,36 @@ void proc_cleanup (struct proc* proc) {
spin_unlock (&proc->lock, &ctxpr);
procgroup_detach (proc->procgroup, proc);
pmm_free (proc->pdata.kernel_stack, KSTACK_SIZE / PAGE_SIZE);
procgroup_unmap (proc->procgroup, proc->pdata.tls_vaddr, proc->procgroup->tls.tls_tmpl_pages);
procgroup_detach (proc->procgroup, proc);
/* clean the process */
free (proc);
}
void proc_init_tls (struct proc* proc) {
struct limine_hhdm_response* hhdm = limine_hhdm_request.response;
size_t tls_size = proc->procgroup->tls.tls_tmpl_size;
uintptr_t tls_paddr;
uint32_t flags = MM_PG_USER | MM_PG_PRESENT | MM_PG_RW;
uintptr_t tls_vaddr =
procgroup_map (proc->procgroup, 0, proc->procgroup->tls.tls_tmpl_pages, flags, &tls_paddr);
uintptr_t k_tls_addr = (uintptr_t)hhdm->offset + tls_paddr;
uintptr_t ktcb = k_tls_addr + tls_size;
uintptr_t utcb = tls_vaddr + tls_size;
memset ((void*)k_tls_addr, 0, tls_size);
memcpy ((void*)k_tls_addr, (void*)proc->procgroup->tls.tls_tmpl, tls_size);
*(uintptr_t*)ktcb = utcb;
proc->pdata.fs_base = utcb;
proc->pdata.tls_vaddr = tls_vaddr;
}