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-rw-r--r--src/arch/riscv/trap_util.S12
1 files changed, 11 insertions, 1 deletions
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