diff options
| author | Xiang W <[email protected]> | 2026-01-04 13:18:10 +0800 |
|---|---|---|
| committer | Anup Patel <[email protected]> | 2026-02-20 11:23:13 +0530 |
| commit | ecdb6c90c83dfc89964e55d7c2a94a5c0f6bc437 (patch) | |
| tree | 047981e153e6123c8f970d6b17f297062cafa7ee /firmware | |
| parent | b27ecec76b8acfece9c28078d02cbc6bc762135c (diff) | |
firmware: Initialize stack guard via Zkr
Try to initialize stack protection guard via the zkr extension.
Signed-off-by: Xiang W <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Anup Patel <[email protected]>
Diffstat (limited to 'firmware')
| -rw-r--r-- | firmware/fw_base.S | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/firmware/fw_base.S b/firmware/fw_base.S index bce9e226..63bb4473 100644 --- a/firmware/fw_base.S +++ b/firmware/fw_base.S @@ -107,6 +107,30 @@ _bss_zero: add s4, s4, __SIZEOF_POINTER__ blt s4, s5, _bss_zero + /* Trying to initialize the stack guard via the Zkr extension */ + lla t0, __stack_chk_guard_done + csrw CSR_MTVEC, t0 + li t0, 0 + li t3, SEED_OPTS_ES16 + li t4, SEED_ENTROPY_MASK + li t5, __SIZEOF_POINTER__ +__stack_chk_guard_loop: + csrrw t1, CSR_SEED, x0 + li t2, SEED_OPTS_MASK + and t2, t2, t1 + bgtu t2, t3, __stack_chk_guard_done + bltu t2, t3, __stack_chk_guard_loop + and t1, t1, t4 + slli t0, t0, 16 + or t0, t0, t1 + addi t5, t5, -2 + bgtz t5, __stack_chk_guard_loop + lla t1, __stack_chk_guard + REG_S t0, 0(t1) + j __stack_chk_guard_done + .align 3 +__stack_chk_guard_done: + /* Setup temporary trap handler */ lla s4, _start_hang csrw CSR_MTVEC, s4 |