Huacai Chen <chenhuacai@xxxxxxxxxx> 于2023年12月5日周二 14:09写道：
>
> Why send a test patch?
>
Confirm the accuracy of the testing method
> On Tue, Dec 5, 2023 at 2:04 PM <wangyao@xxxxxxxxxx> wrote:
> >
> > From: Wang Yao <wangyao@xxxxxxxxxx>
> >
> > This is a test patch for PIE kernel that load address is not equal to
> > link address.
> >
> > Signed-off-by: Wang Yao <wangyao@xxxxxxxxxx>
> > ---
> > drivers/firmware/efi/libstub/loongarch-stub.c | 12 +++++++++++-
> > 1 file changed, 11 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/firmware/efi/libstub/loongarch-stub.c b/drivers/firmware/efi/libstub/loongarch-stub.c
> > index d6ec5d4b8dbe..c13c022d18cf 100644
> > --- a/drivers/firmware/efi/libstub/loongarch-stub.c
> > +++ b/drivers/firmware/efi/libstub/loongarch-stub.c
> > @@ -22,12 +22,22 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
> > efi_handle_t image_handle)
> > {
> > efi_status_t status;
> > - unsigned long kernel_addr = 0;
> > + unsigned long kernel_addr = 0, tmp_addr = 0;
> >
> > kernel_addr = (unsigned long)&kernel_offset - kernel_offset;
> >
> > + /*
> > + * Allocate 2M space at 0x200000(EFI_KIMG_PREFERRED_ADDRESS) for
> > + * test, this will lead to the kernel be loaded at 0x4000000.
> > + */
> > + status = efi_relocate_kernel(&tmp_addr, 0x100000, 0x200000,
> > + EFI_KIMG_PREFERRED_ADDRESS, efi_get_kimg_min_align(), 0x0);
> > + efi_info("@@@[%s] tmp_addr: 0x%lx\n", __func__, tmp_addr);
> > +
> > + /* kernel_addr == 0x400000 */
> > status = efi_relocate_kernel(&kernel_addr, kernel_fsize, kernel_asize,
> > EFI_KIMG_PREFERRED_ADDRESS, efi_get_kimg_min_align(), 0x0);
> > + efi_info("@@@[%s] kernel_addr: 0x%lx\n", __func__, kernel_addr);
> >
> > *image_addr = kernel_addr;
> > *image_size = kernel_asize;
> > --
> > 2.27.0
> >
