buffer for stack, permit cleanup

1 files changed, 5 insertions, 5 deletions

diff --git a/boot/fake_syscall.c b/boot/fake_syscall.c
index e2aaeca..0e94515 100644
--- a/boot/fake_syscall.c
+++ b/boot/fake_syscall.c
@@ -215,11 +215,11 @@ static void install_syscall_handler(void)
 	msr_write(MSR_INDEX_EFER, efer);
 }
 
-static void *create_fake_syscall_stack(void *entry_addr)
+static void *create_fake_syscall_stack(void *entry_addr, struct linear_buffer *stack_buffer)
 {
-	constexpr size_t fake_syscall_stack_size = 0x20000; // 128KiB stack
-	char *stack_pointer_base = mmap(nullptr, fake_syscall_stack_size, 0, 0, -1, 0);
-	void *stack_pointer_head = stack_pointer_base + fake_syscall_stack_size;
+	stack_buffer->length = KJARNA_BOOT_STACK_SIZE;
+	stack_buffer->base = mmap(nullptr, stack_buffer->length, 0, 0, -1, 0);
+	void *stack_pointer_head = stack_buffer->base + stack_buffer->length;
 
 	struct syscall_context *context = stack_alloc(&stack_pointer_head, sizeof(*context));
 
@@ -236,7 +236,7 @@ static void *create_fake_syscall_stack(void *entry_addr)
 int64_t fake_syscall_start(struct kjarna_boot_image *image)
 {
 	install_syscall_handler();
-	void *fake_stack = create_fake_syscall_stack((void *)image->entry);
+	void *fake_stack = create_fake_syscall_stack((void *)image->entry, &image->stack_buffer);
 	save_system_context();
 	int64_t result = fake_syscall_begin(fake_stack, &exit_fake_syscall_stack);
 	return result;