diff options
Diffstat (limited to 'src/arch/riscv')
| -rw-r--r-- | src/arch/riscv/trap_util.S | 12 |
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 |