Hello,

A cortex-M software should not use pie as the execution addresses are fixed always, please check if you really need this option.

BR.

/Ken

-----Original Message----- From: xulu via TF-M tf-m@lists.trustedfirmware.org Sent: Tuesday, March 28, 2023 2:33 PM To: tf-m@lists.trustedfirmware.org Subject: [TF-M] s_veneers linking problem when building uboot with flags -pie

Hi experts,

Recently we are building uboot with s_veneers.o, and found that we can not jump to tfm. The reason is that the jump addr is wrong when compileing with -pie.

The symbol "tfm_vendor_aes_encrypt_with_hardware_ssk" in s_veneers.o. $ nm ./drivers/tfm/lib/s_veneers.o | grep tfm_vendor_aes_encrypt_with_hardware_ssk 04008029 A tfm_vendor_aes_encrypt_with_hardware_ssk

Building uboot without cflags -pie, and the last line shows the wrong jump addr 0xf7fc7e61 0c0401f0 <__tfm_vendor_efuse_write_veneer>: c0401f0: b401 push {r0} c0401f2: 4802 ldr r0, [pc, #8] ; (c0401fc <__tfm_vendor_efuse_write_veneer+0xc>) c0401f4: 46fc mov ip, pc c0401f6: 4484 add ip, r0 c0401f8: bc01 pop {r0} c0401fa: 4760 bx ip c0401fc: f7fc7e61 .word 0xf7fc7e61

Building uboot without cflags -pie，and the last line shows the right jump addr 0x04008029. 0c040200 <__tfm_vendor_aes_encrypt_with_hardware_ssk_veneer>: c040200: b401 push {r0} c040202: 4802 ldr r0, [pc, #8] ; (c04020c <__tfm_vendor_aes_encrypt_with_hardware_ssk_veneer+0xc>) c040204: 4684 mov ip, r0 c040206: bc01 pop {r0} c040208: 4760 bx ip c04020a: bf00 nop c04020c: 04008029 .word 0x04008029

The linker flag -pie is default enabled in uboot(for relocation feature), and we need this feature. Could you please give us some pointers, suggestions or objections about this problem, Thanks! -- TF-M mailing list -- tf-m@lists.trustedfirmware.org To unsubscribe send an email to tf-m-leave@lists.trustedfirmware.org