riscv/kernel: update __show_regs() to print shadow stack register

Update __show_regs() to print the captured shadow stack pointer.  On
tasks where shadow stack is disabled, simply print 0.

Signed-off-by: Deepak Gupta <debug@rivosinc.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Tested-by: Andreas Korb <andreas.korb@aisec.fraunhofer.de> # QEMU, custom CVA6
Tested-by: Valentin Haudiquet <valentin.haudiquet@canonical.com>
Link: https://patch.msgid.link/20251112-v5_user_cfi_series-v23-18-b55691eacf4f@rivosinc.com
[pjw@kernel.org: cleaned up patch description]
Signed-off-by: Paul Walmsley <pjw@kernel.org>

diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
index 49f527e..aacb239 100644 (file)
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
@@ -93,8 +93,8 @@ void __show_regs(struct pt_regs *regs)
                regs->s8, regs->s9, regs->s10);
        pr_cont(" s11: " REG_FMT " t3 : " REG_FMT " t4 : " REG_FMT "\n",
                regs->s11, regs->t3, regs->t4);
-       pr_cont(" t5 : " REG_FMT " t6 : " REG_FMT "\n",
-               regs->t5, regs->t6);
+       pr_cont(" t5 : " REG_FMT " t6 : " REG_FMT " ssp : " REG_FMT "\n",
+               regs->t5, regs->t6, get_active_shstk(current));
 
        pr_cont("status: " REG_FMT " badaddr: " REG_FMT " cause: " REG_FMT "\n",
                regs->status, regs->badaddr, regs->cause);