From 4d6ef3ab0155ba0d7717f22b5ea5042d2a3299f7 Mon Sep 17 00:00:00 2001 From: Jonathan Neuschäfer Date: Thu, 11 Aug 2016 22:49:10 +0200 Subject: arch/riscv: Set the stack pointer upon trap entry MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Change-Id: I52fae62bc6cf775179963720fbcfaa9e07f6a717 Signed-off-by: Jonathan Neuschäfer Reviewed-on: https://review.coreboot.org/16017 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich --- src/arch/riscv/trap_util.S | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'src/arch/riscv') diff --git a/src/arch/riscv/trap_util.S b/src/arch/riscv/trap_util.S index 82a5629f4c..5ee0fddc53 100644 --- a/src/arch/riscv/trap_util.S +++ b/src/arch/riscv/trap_util.S @@ -116,7 +116,17 @@ supervisor_trap_entry: .global trap_entry trap_entry: csrw mscratch, sp - 1:addi sp,sp,-320 + + # SMP isn't supported yet, to avoid overwriting the same stack with different + # harts that handle traps at the same time. + csrr sp, mhartid +.Lsmp_hang: + bnez sp, .Lsmp_hang + + # TODO: Use the old stack pointer (plus an offset) for exceptions in machine + # mode, to avoid overwriting stack data. + li sp, 0x8000fff0 + save_tf move a0,sp jal trap_handler -- cgit v1.2.3